CN118442157A - DPF regeneration control method and system and vehicle - Google Patents

Abstract

The application provides a DPF regeneration control method, a DPF regeneration control system and a vehicle, wherein the DPF regeneration control method comprises the following steps: determining whether a DPF parking regeneration condition is met, and determining whether a parking charging condition is met; activating DPF parking regeneration with a first oil injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second oil injection amount; or activating the parking charge when the parking charge condition is satisfied, and activating the DPF parking regeneration by a third fuel injection amount when the DPF parking regeneration condition is satisfied during the parking charge. According to the application, by combining the DPF parking regeneration with the parking charging, the waste heat in the parking charging process is fully utilized, the fuel injection amount in the DPF parking regeneration process is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

Description

DPF regeneration control method and system and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to a DPF regeneration control method and system and a vehicle.

Background

The hybrid electric vehicle has the characteristics of the traditional fuel oil vehicle and the pure electric vehicle, and gradually becomes one of the main stream development directions of the new energy vehicle by virtue of the characteristics of low emission, low oil consumption, high endurance and the like.

At present, aiming at a PHEV hybrid vehicle, the parking regeneration working condition is frequent, more fuel is required to be consumed to improve the regeneration temperature of the DPF in the process of DPF parking regeneration so as to remove carbon particles in a carrier in the DPF, prevent a regeneration system from being blocked, and the efficiency of an engine operation working condition point is lower, so that the fuel economy of the whole vehicle is not facilitated.

In addition, for the PHEV hybrid vehicle, the parking charging working condition is also frequent, the charging time is long, and the exhaust temperature is relatively low compared with the parking regeneration working condition, so that the carbon loading of the carrier in the regeneration system is further increased, and even the carbon accumulating rate of the DPF is possibly accelerated.

Therefore, a DPF regeneration control method is needed.

Disclosure of Invention

In view of the above, embodiments of the present application provide a DPF regeneration control method, system, and vehicle to overcome or at least partially solve the above problems.

In a first aspect of the embodiment of the present application, a DPF regeneration control method is provided, which includes:

determining whether a DPF parking regeneration condition is met, and determining whether a parking charging condition is met;

Activating DPF parking regeneration with a first oil injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second oil injection amount, wherein the second oil injection amount is lower than the first oil injection amount; or alternatively, the first and second heat exchangers may be,

And activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the process of parking charge, wherein the third fuel injection amount is lower than the first fuel injection amount.

Optionally, the method further comprises:

Judging whether a driver-triggered DPF parking regeneration request is detected or not under the condition that the DPF parking regeneration condition and the parking charging condition are simultaneously met;

If the DPF parking regeneration request is detected, executing the following steps: activating DPF parking regeneration by a first oil injection amount, activating parking charging in the process of DPF parking regeneration, and maintaining DPF parking regeneration by a second oil injection amount;

If the DPF parking regeneration request is not detected, executing the steps of: and activating the parking charge, and activating the DPF to perform parking regeneration by a third fuel injection amount in the process of the parking charge.

Optionally, activating the DPF parking regeneration with the first fuel injection amount, and activating the parking charging if the parking charging condition is satisfied during the DPF parking regeneration, including:

Under the condition that the DPF parking regeneration condition is met, controlling the idle speed of an engine to rise to a first target speed, and controlling an oil injector to inject oil in the first oil injection quantity so as to activate DPF parking regeneration;

judging whether the parking charging condition is met or not in the process of parking regeneration;

and under the condition that the parking charging condition is met, controlling the motor rotation speed to be regulated to a second target rotation speed and controlling the engine torque to be raised to a first target torque so as to activate the parking charging.

Optionally, maintaining the DPF park regeneration at the second fuel injection amount includes:

acquiring a first actual temperature of the DPF after temperature rise;

comparing the first actual temperature with a first target temperature required to maintain a DPF park regeneration, determining a first temperature difference between the first actual temperature and the first target temperature;

Determining the second fuel injection amount according to the first temperature difference;

And controlling the oil injector to inject oil according to the second oil injection quantity so as to maintain the DPF to stop and regenerate.

Optionally, activating the parking charge, and if the DPF parking regeneration condition is met during the parking charge, activating the DPF parking regeneration with a third fuel injection amount, including:

under the condition that the parking charging condition is met, controlling the idle speed of the engine to rise to a third target speed and controlling the torque of the engine to rise to a second target torque so as to activate the parking charging;

Judging whether the DPF parking regeneration condition is met or not in the process of parking charging;

And under the condition that the DPF parking regeneration condition is met, the idle speed of the engine is increased from the third target speed to a fourth target speed, the torque of the engine is increased from the second target torque to a third target torque, and an oil injector is controlled to inject oil in the third oil injection amount so as to activate the DPF parking regeneration.

Optionally, activating the DPF park regeneration with a third fuel injection amount includes:

acquiring a second actual temperature of the DPF after temperature rise;

Comparing the second actual temperature with a second target temperature required for activating the DPF parking regeneration, and determining a second temperature difference between the second actual temperature and the second target temperature;

determining the third fuel injection amount according to the second temperature difference;

and controlling the oil injector to inject oil according to the third oil injection quantity so as to activate the DPF parking regeneration.

Optionally, after maintaining the DPF park regeneration at the second fuel injection amount, the method further includes:

Judging whether the DPF parking regeneration is finished or not;

In the event that it is determined that the DPF park regeneration is completed, the park charge is stopped.

Optionally, after activating the DPF park regeneration at the third fuel injection amount, the method further includes:

Judging whether the parking charging is completed or not;

In the event that completion of the parking charge is determined, the DPF parking regeneration is stopped.

In a second aspect of the embodiments of the present application, there is provided a DPF regeneration control system, the system including:

the first determining module is used for determining whether the DPF parking regeneration condition is met or not and determining whether the parking charging condition is met or not;

The first activation module is used for activating the DPF parking regeneration with a first fuel injection amount under the condition that the DPF parking regeneration condition is met, activating the parking charging if the parking charging condition is met in the DPF parking regeneration process, and maintaining the DPF parking regeneration with a second fuel injection amount, wherein the second fuel injection amount is lower than the first fuel injection amount; or alternatively, the first and second heat exchangers may be,

And the second activation module is used for activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the parking charge process, wherein the third fuel injection amount is lower than the first fuel injection amount.

Optionally, the method further comprises:

the first judging submodule is used for judging whether a DPF parking regeneration request triggered by a driver is detected or not under the condition that the DPF parking regeneration condition and the parking charging condition are simultaneously met;

The first execution submodule is used for executing the following steps if the DPF parking regeneration request is detected: activating DPF parking regeneration by a first oil injection amount, activating parking charging in the process of DPF parking regeneration, and maintaining DPF parking regeneration by a second oil injection amount;

The second execution sub-module is configured to execute, if the DPF parking regeneration request is not detected, the steps of: and activating the parking charge, and activating the DPF to perform parking regeneration by a third fuel injection amount in the process of the parking charge.

Optionally, activating the DPF parking regeneration with a first fuel injection amount, and activating the parking charging if the parking charging condition is satisfied during the DPF parking regeneration, where the first activation module includes:

The first activation submodule is used for controlling the idle speed of the engine to be increased to a first target speed and controlling the oil injector to inject oil according to the first oil injection amount so as to activate the DPF parking regeneration under the condition that the DPF parking regeneration condition is met;

The second judging submodule is used for judging whether the parking charging condition is met or not in the process of parking regeneration;

and the second activating sub-module is used for controlling the motor speed to be regulated to a second target speed and controlling the engine torque to be raised to a first target torque under the condition that the parking charging condition is met so as to activate the parking charging.

Optionally, maintaining the DPF park regeneration at the second fuel injection amount includes:

the first acquisition submodule is used for acquiring a first actual temperature of the DPF after temperature rise;

A first determination sub-module for comparing the first actual temperature with a first target temperature required to maintain a DPF park regeneration, determining a first temperature difference between the first actual temperature and the first target temperature;

The second determining submodule is used for determining the second oil injection quantity according to the first temperature difference;

and the first control submodule is used for controlling the oil injector to inject oil according to the second oil injection quantity so as to maintain DPF parking regeneration.

Optionally, activating parking charging, and in the process of parking charging, if the DPF parking regeneration condition is met, activating DPF parking regeneration with a third fuel injection amount, where the second activation module includes:

A third activation submodule, configured to control an idle speed of an engine to rise to a third target speed and control a torque of the engine to rise to a second target torque to activate parking charging when the parking charging condition is satisfied;

The third judging submodule is used for judging whether the DPF parking regeneration condition is met or not in the process of parking charging;

and the second control submodule is used for increasing the idle speed of the engine from the third target speed to the fourth target speed and increasing the torque of the engine from the second target torque to the third target torque under the condition that the DPF parking regeneration condition is met, and controlling an oil injector to inject oil in the third oil injection quantity so as to activate DPF parking regeneration.

Optionally, activating the DPF park regeneration with a third fuel injection amount includes:

the second acquisition submodule is used for acquiring a second actual temperature of the DPF after temperature rise;

a third determination sub-module for comparing the second actual temperature with a second target temperature required to activate the DPF parking regeneration, determining a second temperature difference between the second actual temperature and the second target temperature;

A fourth determination submodule for determining the third fuel injection quantity according to the second temperature difference;

and the third control submodule is used for controlling the oil injector to inject oil according to the third oil injection quantity so as to activate the DPF parking regeneration.

Optionally, after maintaining the DPF park regeneration at the second fuel injection amount, the method further includes:

a fourth judging sub-module for judging whether the DPF parking regeneration is completed;

And the first stopping sub-module is used for stopping parking charging under the condition that the completion of the DPF parking regeneration is determined.

Optionally, the method further comprises:

a fifth judging sub-module for judging whether the parking charging is completed;

and the second stopping sub-module is used for stopping DPF parking regeneration under the condition that the completion of parking charging is determined.

According to a third aspect of embodiments of the present application, there is provided a vehicle including the DPF regeneration control system according to the second aspect of the present application, and/or performing the DPF regeneration control method according to the first aspect of the present application.

The application has the beneficial effects that:

The embodiment of the application provides a DPF regeneration control method, which comprises the following steps: determining whether a DPF parking regeneration condition is met, and determining whether a parking charging condition is met; activating DPF parking regeneration with a first oil injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second oil injection amount, wherein the second oil injection amount is lower than the first oil injection amount; or activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the process of parking charge, wherein the third fuel injection amount is lower than the first fuel injection amount. According to the application, by combining the DPF parking regeneration with the parking charging, the waste heat in the parking charging process is fully utilized, the fuel injection amount in the DPF parking regeneration process is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of steps of a DPF regeneration control method provided by an embodiment of the present application;

FIG. 2 is a flow chart of a regeneration control method for preferential activation of DPF parking regeneration provided by an embodiment of the present application;

FIG. 3 is a block flow diagram of a method for controlling regeneration with priority activation of parking charging according to an embodiment of the present application;

fig. 4 is a schematic diagram of a DPF regeneration control system according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

In the present application, a PHEV hybrid vehicle is exemplified in which the engine is a diesel engine, and therefore, when the diesel engine of the vehicle is started, a large amount of harmful substances are contained in exhaust gas discharged. To reduce emissions of these harmful substances, vehicles are often equipped with a DPF (Diesel Particulate Filter, particulate trap) that traps and stores particulate matter in the exhaust gas.

Currently, for hybrid vehicles, regarding the problem of decrease of SOC (State of Charge) of a power battery caused by pure electric driving and power assistance of a motor while the vehicle is running, current general solutions are: in the driving process of the engine, according to the preset parameters of the HCU (Hybrid Control Unit, the whole vehicle control unit), when the required torque and the SOC of the power battery are lower than a certain limit value, the engine outputs a part of power for overcoming the negative torque of the motor to charge the vehicle, and the SOC of the power battery is increased. Or when the SOC value of the power battery is lower than a certain limit value, under the parking working condition, the vehicle control unit HCU sends a high idle speed control request to the ECU (Engine Control Unit, the engine control unit) and simultaneously closes the C0 clutch, so that the engine overcomes the negative torque of the motor to carry out parking charging, and aiming at the parking charging working condition, the DPF carbon accumulating rate is accelerated due to the fact that frequent and long-time parking charging is needed, and the temperature of a regeneration system is relatively low and does not reach the DPF regeneration temperature.

Furthermore, for the problem of increased DPF carbon loading in hybrid vehicles, current common solutions are: when the carbon load is higher than a certain set limit value, under the parking state, the engine ECU triggers the DPF parking regeneration working condition, the engine ECU can improve the idle speed of the engine in the regeneration process, meanwhile, the DPF temperature is improved, the regeneration at high temperature is ensured, the engine ECU can control the oil injector to carry out post-injection fuel oil, the post-injection fuel oil is combusted in a DPF regeneration system, so that the temperature of the DPF is improved, a necessary condition is provided for DPF parking regeneration, the post-injection fuel oil sprayed by the regeneration process for improving the DPF temperature is only used for heating, and no torque is output for driving, so that the fuel consumption rate is increased due to the introduction of the post-injection fuel oil in the DPF regeneration process.

In the above process, the main problems are: in the parking charging process, the rotating speed of the engine is increased, a large amount of fuel is consumed for charging, the consumed fuel generates a large amount of heat to be discharged to the atmosphere along with tail gas, and the fuel utilization rate is low. Frequent and long-time parking charging can lead to acceleration of the DPF carbon accumulating rate; and further causes the problem that DPF carbon loading increases, and at this moment engine ECU promotes idle speed, simultaneously, through increasing the post-injection quantity, promotes DPF's temperature to realize DPF parking regeneration, the post-injection quantity that consumes in the regeneration process only is used for the intensification, therefore combustion efficiency is low in the regeneration process, and the fuel consumption rate increases.

In a first aspect of the embodiment of the present application, a DPF regeneration control method is provided, which is applied to an HCU of a vehicle, as shown in fig. 1, and includes:

Step S101, determining whether a DPF parking regeneration condition is met or not, and determining whether a parking charging condition is met or not;

Step S102, activating DPF parking regeneration with a first fuel injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second fuel injection amount, wherein the second fuel injection amount is lower than the first fuel injection amount; or alternatively, the first and second heat exchangers may be,

Step S103, activating parking charge when the parking charge condition is satisfied, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is satisfied during the parking charge, where the third fuel injection amount is lower than the first fuel injection amount.

Specifically, in the present application, when the vehicle is in a parked state, it is first necessary to determine whether the current vehicle satisfies the DPF parking regeneration condition, and whether the parking charge condition is satisfied. In practical application, the DPF parking regeneration condition is that the carbon loading in the DPF of the vehicle reaches the preset carbon loading; the parking charge condition is that the SOC of the vehicle is lower than a preset SOC.

If it is determined that the current vehicle meets the condition of DPF parking regeneration, that is, if the carbon load in the DPF of the current vehicle reaches the preset carbon load, at this time, an instruction is sent to the ECU by the HCU of the vehicle to make the ECU control the fuel injector to perform fuel injection with a first fuel injection amount, thereby activating DPF parking regeneration, in the process of DPF parking regeneration, parking charging is activated, it is necessary to further determine whether the current vehicle meets the condition of parking charging if the parking charging is to be activated, that is, if the SOC of the current vehicle is to be determined to be lower than the preset SOC, parking charging is to be activated, when the parking charging is activated, the CO clutch of the vehicle is closed, in this process, the engine needs to overcome the negative torque of the motor to perform work, compared with the idle high idle condition of the engine, in the parking charging process, the exhaust temperature of the engine is higher, therefore, the temperature of the DPF is increased, and DPF regeneration is maintained with a corresponding second fuel injection amount after the temperature is increased, since the parking regeneration needs to be activated, in the process of maintaining the target temperature increased from a relatively lower temperature, in the process of DPF parking regeneration, and in the process of maintaining the parking regeneration, the parking regeneration is lower than the first fuel injection amount when the parking regeneration is activated, which is caused by the engine is activated. Or alternatively, the first and second heat exchangers may be,

If it is determined that the current vehicle meets the condition of parking charging, that is, the SOC of the current vehicle is lower than the preset SOC, an instruction for activating the parking charging is sent by the HCU of the vehicle to activate the parking charging. In the process of parking charging, the engine needs to overcome the negative torque of the motor to do work, and compared with the idle high idle working condition of the engine, the exhaust temperature of the engine is higher in the parking charging process, so that the temperature of the DPF is increased, at the moment, if the current vehicle meets the DPF parking regeneration condition, the DPF parking regeneration is activated by a third fuel injection amount corresponding to the DPF after the temperature is increased, and the third fuel injection amount is lower than the first fuel injection amount.

In the application, when in parking charging, the engine needs to overcome the negative torque of the motor to do work, so that compared with the idle high-idle working condition of the engine, the exhaust temperature of the engine is relatively higher in the parking charging process, and the temperature of the DPF is heated under the influence of the waste heat of the engine in the parking charging process.

According to the application, by combining the DPF parking regeneration with the parking charging, the waste heat in the parking charging process is fully utilized, the fuel injection amount in the DPF parking regeneration process is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

In a preferred embodiment of the present application, in the case where the DPF parking regeneration condition and the parking charging condition are simultaneously satisfied, it is determined whether a driver-triggered DPF parking regeneration request is detected;

If the DPF parking regeneration request is detected, executing the following steps: activating DPF parking regeneration by a first oil injection amount, activating parking charging in the process of DPF parking regeneration, and maintaining DPF parking regeneration by a second oil injection amount;

If the DPF parking regeneration request is not detected, executing the steps of: and activating the parking charge, and activating the DPF to perform parking regeneration by a third fuel injection amount in the process of the parking charge.

Specifically, in this embodiment, when the DPF parking regeneration condition and the parking charging condition are satisfied at the same time, that is, the carbon load of the DPF of the current vehicle reaches the preset carbon load, and the SOC of the current vehicle is lower than the preset SOC, the HCU of the vehicle first detects whether there is a request for DPF parking regeneration triggered by the driver. If the HCU of the vehicle detects a DPF parking regeneration request issued by the driver, the HCU of the vehicle will perform the following operations: the HCU will send a command to the ECU to cause the ECU to control the injector of the engine to activate the DPF park regeneration with a first amount of fuel injection, during which the HCU will also activate park charge, when the park charge is activated, the CO clutch of the vehicle is closed, during which the engine needs to work against the negative torque of the motor, and during park charge the exhaust temperature of the engine is higher than during idle high idle conditions of the engine, so that the temperature of the DPF will increase and maintain the DPF park regeneration with a second amount of fuel injection corresponding to the DPF after the temperature increase. During the DPF park regeneration, the system will continue to use the second amount of fuel injection to maintain the DPF regeneration state while maintaining fuel consumption at a lower level.

If the HCU of the vehicle does not detect a DPF park regeneration request issued by the driver, it will perform another set of operations: firstly, the system activates the parking charging function, in the process of parking charging, the engine needs to overcome the negative torque of the motor to do work, and compared with the idle high-idle working condition of the engine, in the process of parking charging, the exhaust temperature of the engine is higher, and the temperature of the DPF is increased by the waste heat generated by the engine in the process of parking charging so as to assist in heating the DPF. During the park charge, the HCU will send instructions to the ECU to cause the ECU to control the engine's injectors to inject a third amount of fuel to activate the DPF park regeneration to keep fuel consumption at a low level.

In a preferred embodiment of the present application, activating the DPF parking regeneration with a first fuel injection amount, and activating the parking charge if the parking charge condition is satisfied during the DPF parking regeneration, includes:

Under the condition that the DPF parking regeneration condition is met, controlling the idle speed of an engine to rise to a first target speed, and controlling an oil injector to inject oil in the first oil injection quantity so as to activate DPF parking regeneration;

judging whether the parking charging condition is met or not in the process of parking regeneration;

and under the condition that the parking charging condition is met, controlling the motor rotation speed to be regulated to a second target rotation speed and controlling the engine torque to be raised to a first target torque so as to activate the parking charging.

Specifically, in the present embodiment, when the DPF park regeneration condition is satisfied, the HCU of the vehicle will perform the following operations to activate the DPF park regeneration: first, the HCU of the vehicle sends a command to the ECU to cause the ECU to control the idle speed of the engine to rise to a first target speed. And simultaneously, controlling the fuel injector to inject fuel in a first fuel injection quantity so as to activate the DPF parking regeneration. During the DPF parking regeneration, the HCU can continuously monitor whether the current vehicle meets the condition of parking charge. If the HCU determines that the park charge condition is satisfied, it will perform the following operations to activate the park charge: the rotation speed of the motor is controlled, and the rotation speed is adjusted from the closed state to a second target rotation speed, wherein in practical application, the second target rotation speed can be the same as the first target rotation speed. At the same time, the CO clutch is closed and the torque of the engine is controlled to be raised to a first target torque to activate the park charge.

In a preferred embodiment of the present application, maintaining DPF park regeneration at a second fuel injection amount includes:

acquiring a first actual temperature of the DPF after temperature rise;

comparing the first actual temperature with a first target temperature required to maintain a DPF park regeneration, determining a first temperature difference between the first actual temperature and the first target temperature;

Determining the second fuel injection amount according to the first temperature difference;

And controlling the oil injector to inject oil according to the second oil injection quantity so as to maintain the DPF to stop and regenerate.

Specifically, in the present embodiment, first, the HCU of the vehicle acquires the first actual temperature of the DPF after the temperature rise. By acquiring the first actual temperature of the DPF after temperature rise, the current temperature condition of the DPF can be known to determine whether the parking regeneration needs to be maintained.

Further, the HCU of the vehicle compares the acquired first actual temperature of the DPF with a first target temperature required to maintain the DPF park regeneration. The first target temperature is a temperature at which it is ensured that the DPF can be effectively park-regenerated.

A first temperature difference between the first actual temperature and the first target temperature is determined based on the comparison. The degree to which the current temperature deviates from the desired target temperature can be determined from the first temperature difference.

The HCU of the vehicle calculates a second fuel injection amount corresponding to the first temperature difference based on the first temperature difference for maintaining the parking regeneration of the DPF.

Finally, the HCU of the vehicle sends instructions to the ECU to control the injector of the engine to inject fuel according to the determined second fuel injection amount by the ECU to maintain the parked regeneration process of the DPF, ensuring that the DPF remains within a proper temperature range for effective removal of particulate matter.

In this embodiment, the fuel injection amount is automatically adjusted according to the temperature of the DPF, so as to ensure that the regeneration process of the DPF can be performed under the optimal conditions, which not only helps to reduce the carbon content in the DPF, but also helps to reduce the fuel consumption.

As shown in fig. 2, a flow chart of a regeneration control method for preferentially activating DPF parking regeneration according to the present application is shown in fig. 2, first, it is determined whether a parking regeneration request exists, if the parking regeneration request exists, it is continuously determined whether a DPF parking regeneration condition is satisfied, that is, whether a carbon load of a DPF reaches a preset carbon load is determined, and if the parking regeneration request does not exist, the flow is directly ended.

And if the current DPF parking regeneration condition is judged to be met, activating the DPF parking regeneration, otherwise ending the flow.

When the DPF park regeneration is performed, the rotational speed of the engine will be raised from the idle rotational speed to the first target rotational speed, and the injector will inject fuel at the first fuel injection amount, in which process the temperature of the DPF will be raised as the engine rotational speed is raised and the carbon loading of the DPF will be lowered as the DPF park regeneration is performed.

In the DPF parking regeneration process, whether the condition of parking charging is met at present is judged, namely whether the SOC of the current vehicle is smaller than the preset SOC is judged, if the condition of parking charging is met at present, the parking charging is activated, at this time, the motor rotation speed is increased to the second target rotation speed, the engine torque is controlled to be increased to the first target torque, and if not, the parking charging is not carried out.

In the parking charging process, the CO clutch of the vehicle is closed, in the process, the engine is required to overcome the negative torque of the motor to do work, compared with the idle high-idle working condition of the engine, the exhaust temperature of the engine is higher in the parking charging process, and the exhaust waste heat of the engine heats the DPF, so that the temperature of the DPF is continuously increased, and the parking regeneration of the DPF is maintained by the second oil injection amount corresponding to the DPF after the temperature is increased. The second fuel injection amount is continuously used to maintain the regeneration state of the DPF during the DPF parking regeneration while keeping the fuel consumption at a low level, and in addition, the SOC of the power battery of the vehicle is continuously increased during the DPF parking regeneration by performing the parking charge. Further, after the completion of the parking regeneration, the parking charge is stopped.

In the application, when DPF parking regeneration is preferentially activated, the HCU of the vehicle automatically monitors whether the parking charging condition is met, activates the parking charging when the parking charging condition is met, maintains the rotating speed of the engine during the DPF parking regeneration, simultaneously controls the engine to overcome the negative torque of the motor to generate electricity, and actively reduces the oil injection quantity of the oil injector after the DPF temperature is increased. According to the embodiment, the DPF parking regeneration is simultaneously carried out in a parking charging mode, in addition, in the DPF parking regeneration process, the waste heat in the parking charging process is fully utilized, the fuel injection quantity of the DPF parking regeneration is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

In a preferred embodiment of the present application, activating the parking charge, and if the parking charge condition is satisfied during the parking charge, activating the DPF parking regeneration with a third fuel injection amount includes:

under the condition that the parking charging condition is met, controlling the idle speed of the engine to rise to a third target speed and controlling the torque of the engine to rise to a second target torque so as to activate the parking charging;

Judging whether the DPF parking regeneration condition is met or not in the process of parking charging;

And under the condition that the DPF parking regeneration condition is met, the idle speed of the engine is increased from the third target speed to a fourth target speed, the torque of the engine is increased from the second target torque to a third target torque, and an oil injector is controlled to inject oil in the third oil injection amount so as to activate the DPF parking regeneration.

Specifically, in the present embodiment, when the parking charge condition is satisfied, the HCU of the vehicle performs the following operations to activate the parking charge:

The HCU of the vehicle sends a command to the ECU to cause the ECU to control the idle speed of the engine to increase to a third target speed, and at the same time, the HCU of the vehicle also controls the torque of the engine to increase to a second target torque to initiate park charging. During the parking charge, the HCU of the vehicle will continue to monitor whether the current vehicle meets the condition for DPF park regeneration.

If the vehicle's HCU determines that the DPF park regeneration condition is currently met, the vehicle's HCU will perform the following operations to activate the DPF park regeneration:

first, the HCU of the vehicle sends a command to the ECU to cause the ECU to control the idle speed of the engine to rise from the third target speed to the fourth target speed. At the same time, the torque of the engine is raised from the second target torque to the third target torque.

The HCU then sends instructions to the ECU to cause the ECU to control the engine's fuel injector to inject fuel at the desired third fuel injection amount to activate the park regeneration process of the DPF.

In the application, the parking regeneration of the DPF is activated according to specific conditions while the parking charge is carried out, so that the DPF is ensured to be kept at proper temperature and operating state, and particulate matters are effectively removed. This helps maintain DPF performance, reduces emissions, and improves vehicle environmental protection.

In a preferred embodiment of the present application, activating the DPF park regeneration at a third fuel injection amount includes:

acquiring a second actual temperature of the DPF after temperature rise;

Comparing the second actual temperature with a second target temperature required for activating the DPF parking regeneration, and determining a second temperature difference between the second actual temperature and the second target temperature;

determining the third fuel injection amount according to the second temperature difference;

and controlling the oil injector to inject oil according to the third oil injection quantity so as to activate the DPF parking regeneration.

Specifically, in the present embodiment, the HCU of the vehicle will first acquire the second actual temperature of the DPF after the temperature rise in order to determine whether the second actual temperature reaches the DPF activation temperature.

Then, the second actual temperature is compared with a second target temperature required for activating the DPF parking regeneration, and a second temperature difference between the second actual temperature and the second target temperature is determined according to the comparison result.

Further, based on the second temperature difference, a third oil injection amount corresponding to the second temperature difference is calculated, and then the HCU of the vehicle sends an instruction to the ECU so as to control an oil injector of the engine to inject oil at the third oil injection amount through the ECU, so that DPF parking regeneration is activated.

According to the embodiment, the fuel injection quantity is adjusted according to the DPF temperature, and the DPF parking regeneration is activated based on the adjusted fuel injection quantity, so that the fuel consumption is saved, and the fuel utilization rate is improved.

As shown in fig. 3, a flow chart of a method for controlling regeneration with preferential activation of parking charging according to the present application is shown in fig. 3, where first, it is determined whether a parking charging request exists, if so, it is further determined whether a parking charging condition is satisfied, and if not, the flow is directly ended.

Further, if the parking charging condition is satisfied, the parking charging is activated, and if the parking charging condition is not satisfied, the flow is ended.

During the park charge, the clutch is closed, the engine speed will be raised from the idle speed to a third target speed, and torque cues of the engine are controlled to the second target torque. In this process, the SOC of the power battery will increase, and the exhaust temperature of the engine will increase and the exhaust waste heat of the engine will heat the DPF due to the increased idle speed of the engine and the need for the engine to work against the negative torque of the motor.

Further, during the parking charging, it is determined whether the DPF parking regeneration condition is satisfied, if so, the DPF parking regeneration is activated, and if not, the DPF parking regeneration is not performed.

During the DPF park regeneration, the rotational speed of the engine will be raised from the third target rotational speed to the fourth target rotational speed, the engine torque will be raised from the second target torque to the third target torque, and the injector will inject fuel at the third injection amount. In this process, since the parking charge causes an increase in the engine exhaust gas temperature, the DPF is heated by the exhaust gas waste heat of the engine, and therefore, the third fuel injection amount when the DPF parking regeneration is activated after the priority of activation of the parking charge is lower than the fuel injection amount when the DPF parking regeneration is activated alone. At this time, the DPF carbon load will decrease as the DPF park regeneration proceeds, and the power battery SOC will continue to increase as the park charging proceeds. Further, if the parking charge is completed, the DPF parking regeneration is stopped.

In the application, when the parking charge is preferentially activated, the HCU of the vehicle automatically detects whether the DPF parking regeneration condition is met, activates the DPF parking regeneration when the DPF parking regeneration condition is met, controls the rotation speed of the engine to be increased to the rotation speed when the DPF is in parking regeneration and controls the torque of the engine to be increased to the torque when the DPF is in parking regeneration, and simultaneously controls the engine to overcome the negative torque of the motor to generate electricity, and actively reduces the fuel injection quantity of the fuel injector after the DPF temperature is increased. According to the embodiment, the DPF parking regeneration is performed while the parking charging is realized, in addition, in the DPF parking regeneration process, the waste heat in the parking charging process is fully utilized, the fuel injection quantity of the DPF parking regeneration is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

In a preferred embodiment of the present application, after maintaining the DPF park regeneration at the second fuel injection amount, the method further includes:

Judging whether the DPF parking regeneration is finished or not;

In the event that it is determined that the DPF park regeneration is completed, the park charge is stopped.

In the present embodiment, since the DPF parking regeneration is preferentially activated, the parking charge is stopped after the completion of the DPF parking regeneration, so that the fuel consumption can be effectively reduced.

In a preferred embodiment of the present application, after activating the DPF park regeneration at the third fuel injection amount, the method further includes:

Judging whether the parking charging is completed or not;

In the event that completion of the parking charge is determined, the DPF parking regeneration is stopped.

In the present embodiment, since the parking charge is preferentially activated, after the completion of the parking charge, the DPF parking regeneration is stopped, so that the fuel consumption can be effectively reduced.

The embodiment of the application provides a DPF regeneration control method, which comprises the following steps: determining whether a DPF parking regeneration condition is met, and determining whether a parking charging condition is met; activating DPF parking regeneration with a first oil injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second oil injection amount, wherein the second oil injection amount is lower than the first oil injection amount; or activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the process of parking charge, wherein the third fuel injection amount is lower than the first fuel injection amount. According to the application, by combining the DPF parking regeneration with the parking charging, the waste heat in the parking charging process is fully utilized, the fuel injection amount in the DPF parking regeneration process is reduced, the fuel utilization rate of the whole vehicle is improved, the fuel consumption is reduced, and the DPF regeneration mileage is improved.

Based on the same inventive concept, in a second aspect of the embodiment of the present application, there is provided a DPF regeneration control system, as shown in fig. 4, the system including:

A first determining module 201, configured to determine whether a DPF parking regeneration condition is satisfied, and determine whether a parking charging condition is satisfied;

A first activation module 202, configured to activate DPF parking regeneration with a first fuel injection amount when the DPF parking regeneration condition is satisfied, activate parking charging if the parking charging condition is satisfied during the DPF parking regeneration, and maintain DPF parking regeneration with a second fuel injection amount, where the second fuel injection amount is lower than the first fuel injection amount; or alternatively, the first and second heat exchangers may be,

And the second activation module 203 is configured to activate parking charging when the parking charging condition is satisfied, and activate DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is satisfied during the parking charging, where the third fuel injection amount is lower than the first fuel injection amount.

Optionally, the method further comprises:

the first judging submodule is used for judging whether a DPF parking regeneration request triggered by a driver is detected or not under the condition that the DPF parking regeneration condition and the parking charging condition are simultaneously met;

The first execution submodule is used for executing the following steps if the DPF parking regeneration request is detected: activating DPF parking regeneration by a first oil injection amount, activating parking charging in the process of DPF parking regeneration, and maintaining DPF parking regeneration by a second oil injection amount;

The second execution sub-module is configured to execute, if the DPF parking regeneration request is not detected, the steps of: and activating the parking charge, and activating the DPF to perform parking regeneration by a third fuel injection amount in the process of the parking charge.

Optionally, the DPF parking regeneration is activated by a first fuel injection amount, and if the parking charging condition is satisfied during the DPF parking regeneration, the parking charging is activated, and the first activation module 202 includes:

The first activation submodule is used for controlling the idle speed of the engine to be increased to a first target speed and controlling the oil injector to inject oil according to the first oil injection amount so as to activate the DPF parking regeneration under the condition that the DPF parking regeneration condition is met;

The second judging submodule is used for judging whether the parking charging condition is met or not in the process of parking regeneration;

and the second activating sub-module is used for controlling the motor speed to be regulated to a second target speed and controlling the engine torque to be raised to a first target torque under the condition that the parking charging condition is met so as to activate the parking charging.

Optionally, maintaining the DPF park regeneration at the second fuel injection amount includes:

the first acquisition submodule is used for acquiring a first actual temperature of the DPF after temperature rise;

A first determination sub-module for comparing the first actual temperature with a first target temperature required to maintain a DPF park regeneration, determining a first temperature difference between the first actual temperature and the first target temperature;

The second determining submodule is used for determining the second oil injection quantity according to the first temperature difference;

and the first control submodule is used for controlling the oil injector to inject oil according to the second oil injection quantity so as to maintain DPF parking regeneration.

Optionally, the parking charging is activated, and if the condition of DPF parking regeneration is satisfied during the parking charging, the DPF parking regeneration is activated by a third fuel injection amount, and the second activation module 203 includes:

A third activation submodule, configured to control an idle speed of an engine to rise to a third target speed and control a torque of the engine to rise to a second target torque to activate parking charging when the parking charging condition is satisfied;

The third judging submodule is used for judging whether the DPF parking regeneration condition is met or not in the process of parking charging;

and the second control submodule is used for increasing the idle speed of the engine from the third target speed to the fourth target speed and increasing the torque of the engine from the second target torque to the third target torque under the condition that the DPF parking regeneration condition is met, and controlling an oil injector to inject oil in the third oil injection quantity so as to activate DPF parking regeneration.

Optionally, activating the DPF park regeneration with a third fuel injection amount includes:

the second acquisition submodule is used for acquiring a second actual temperature of the DPF after temperature rise;

a third determination sub-module for comparing the second actual temperature with a second target temperature required to activate the DPF parking regeneration, determining a second temperature difference between the second actual temperature and the second target temperature;

A fourth determination submodule for determining the third fuel injection quantity according to the second temperature difference;

and the third control submodule is used for controlling the oil injector to inject oil according to the third oil injection quantity so as to activate the DPF parking regeneration.

Optionally, after maintaining the DPF park regeneration at the second fuel injection amount, the method further includes:

a fourth judging sub-module for judging whether the DPF parking regeneration is completed;

And the first stopping sub-module is used for stopping parking charging under the condition that the completion of the DPF parking regeneration is determined.

Optionally, the method further comprises:

a fifth judging sub-module for judging whether the parking charging is completed;

and the second stopping sub-module is used for stopping DPF parking regeneration under the condition that the completion of parking charging is determined.

According to a third aspect of embodiments of the present application, there is provided a vehicle including the DPF regeneration control system according to the second aspect of the present application and/or performing the DPF regeneration control method according to the first aspect of the present application, based on the same inventive concept.

In this specification, each embodiment is mainly described in the specification as a difference from other embodiments, and identical and similar parts between the embodiments are referred to each other.

It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.

The foregoing has outlined a detailed description of a DPF regeneration control method, system and vehicle, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the method and core concepts of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A DPF regeneration control method, characterized by comprising:

determining whether a DPF parking regeneration condition is met, and determining whether a parking charging condition is met;

Activating DPF parking regeneration with a first oil injection amount under the condition that the DPF parking regeneration condition is met, activating parking charging if the parking charging condition is met in the process of DPF parking regeneration, and maintaining DPF parking regeneration with a second oil injection amount, wherein the second oil injection amount is lower than the first oil injection amount; or alternatively, the first and second heat exchangers may be,

And activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the process of parking charge, wherein the third fuel injection amount is lower than the first fuel injection amount.

2. The DPF regeneration control method according to claim 1, characterized in that the method further comprises:

Judging whether a driver-triggered DPF parking regeneration request is detected or not under the condition that the DPF parking regeneration condition and the parking charging condition are simultaneously met;

If the DPF parking regeneration request is detected, executing the following steps: activating DPF parking regeneration by a first oil injection amount, activating parking charging in the process of DPF parking regeneration, and maintaining DPF parking regeneration by a second oil injection amount;

If the DPF parking regeneration request is not detected, executing the steps of: and activating the parking charge, and activating the DPF to perform parking regeneration by a third fuel injection amount in the process of the parking charge.

3. The DPF regeneration control method according to claim 1 or 2, characterized in that activating the DPF parking regeneration with a first fuel injection amount, and activating the parking charge if the parking charge condition is satisfied during the DPF parking regeneration, includes:

Under the condition that the DPF parking regeneration condition is met, controlling the idle speed of an engine to rise to a first target speed, and controlling an oil injector to inject oil in the first oil injection quantity so as to activate DPF parking regeneration;

judging whether the parking charging condition is met or not in the process of parking regeneration;

and under the condition that the parking charging condition is met, controlling the motor rotation speed to be regulated to a second target rotation speed and controlling the engine torque to be raised to a first target torque so as to activate the parking charging.

4. The DPF regeneration control method according to claim 3, characterized in that maintaining the DPF parking regeneration at the second fuel injection amount includes:

acquiring a first actual temperature of the DPF after temperature rise;

comparing the first actual temperature with a first target temperature required to maintain a DPF park regeneration, determining a first temperature difference between the first actual temperature and the first target temperature;

Determining the second fuel injection amount according to the first temperature difference;

And controlling the oil injector to inject oil according to the second oil injection quantity so as to maintain the DPF to stop and regenerate.

5. The DPF regeneration control method according to claim 1 or 2, characterized in that activating a parking charge, during which, if the DPF parking regeneration condition is satisfied, activates DPF parking regeneration with a third fuel injection amount, includes:

under the condition that the parking charging condition is met, controlling the idle speed of the engine to rise to a third target speed and controlling the torque of the engine to rise to a second target torque so as to activate the parking charging;

Judging whether the DPF parking regeneration condition is met or not in the process of parking charging;

And under the condition that the DPF parking regeneration condition is met, the idle speed of the engine is increased from the third target speed to a fourth target speed, the torque of the engine is increased from the second target torque to a third target torque, and an oil injector is controlled to inject oil in the third oil injection amount so as to activate the DPF parking regeneration.

6. The DPF regeneration control method according to claim 5, characterized in that activating the DPF parking regeneration at a third fuel injection amount includes:

acquiring a second actual temperature of the DPF after temperature rise;

Comparing the second actual temperature with a second target temperature required for activating the DPF parking regeneration, and determining a second temperature difference between the second actual temperature and the second target temperature;

determining the third fuel injection amount according to the second temperature difference;

and controlling the oil injector to inject oil according to the third oil injection quantity so as to activate the DPF parking regeneration.

7. The DPF regeneration control method according to claim 1, characterized in that after maintaining the DPF parking regeneration at the second fuel injection amount, the method further comprises:

Judging whether the DPF parking regeneration is finished or not;

In the event that it is determined that the DPF park regeneration is completed, the park charge is stopped.

8. The DPF regeneration control method according to claim 1, characterized in that after activating the DPF parking regeneration at the third fuel injection amount, the method further comprises:

Judging whether the parking charging is completed or not;

In the event that completion of the parking charge is determined, the DPF parking regeneration is stopped.

9. A DPF regeneration control system, the system comprising:

the first determining module is used for determining whether the DPF parking regeneration condition is met or not and determining whether the parking charging condition is met or not;

The first activation module is used for activating the DPF parking regeneration with a first fuel injection amount under the condition that the DPF parking regeneration condition is met, activating the parking charging if the parking charging condition is met in the DPF parking regeneration process, and maintaining the DPF parking regeneration with a second fuel injection amount, wherein the second fuel injection amount is lower than the first fuel injection amount; or alternatively, the first and second heat exchangers may be,

And the second activation module is used for activating parking charge under the condition that the parking charge condition is met, and activating DPF parking regeneration with a third fuel injection amount if the DPF parking regeneration condition is met in the parking charge process, wherein the third fuel injection amount is lower than the first fuel injection amount.

10. A vehicle characterized in that it comprises the DPF regeneration control system according to claim 9 and/or performs the DPF regeneration control method according to any one of claims 1 to 8.