CN110654371A - Control method and device of vehicle power system and vehicle - Google Patents
Control method and device of vehicle power system and vehicle Download PDFInfo
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- CN110654371A CN110654371A CN201810715329.4A CN201810715329A CN110654371A CN 110654371 A CN110654371 A CN 110654371A CN 201810715329 A CN201810715329 A CN 201810715329A CN 110654371 A CN110654371 A CN 110654371A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
- B60W20/17—Control strategies specially adapted for achieving a particular effect for noise reduction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a control method and a control device of a vehicle power system and a vehicle; the control method comprises the following steps: acquiring state information of a vehicle in a driving process; determining the current control demand of the vehicle according to the state information; wherein the control demand includes at least one of starting the engine, pulling the engine off, and boosting the engine; and controlling the BSG according to the control requirement. The control method and device of the vehicle power system and the vehicle have the advantages of high power generation efficiency, capability of realizing power generation under all working conditions, capability of enabling the high-voltage component to still normally work when the power battery fails, low system noise, high performance, strong driveability and high driving experience of users.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a control method and device of a vehicle power system and a vehicle.
Background
Hybrid refers generally to an oil-electric hybrid, i.e., a mixture of fuel (gasoline, diesel, etc.) and electrical energy. A hybrid vehicle is an auxiliary power drive vehicle having an electric motor as an engine.
In the related art, a power control system of a hybrid electric vehicle mainly includes an engine, a motor, a power battery, a clutch and a transmission, a low-voltage starter, a high-voltage component and other high-voltage components. The motor in the power control system performs both a driving function and a power generating function. However, an engine in the existing power control system is started under the drive of a low-voltage starter, but the low-voltage starter starts the engine, so that the service life of the low-voltage starter is often shortened, the performance of a vehicle is influenced, the drivability of the vehicle is poor, and the low-voltage starter has high noise, so that the user experience is low.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for controlling a vehicle power system, so as to reduce the life loss of a low-voltage starter, improve the performance and drivability of a vehicle, reduce noise, and improve user experience.
A second object of the present invention is to provide a control device of a vehicle powertrain.
A third object of the invention is to propose a vehicle.
A fourth object of the invention is to propose an electronic device.
A fifth object of the invention is to propose a non-transitory computer-readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present invention provides a control method for a vehicle powertrain, wherein the vehicle powertrain includes: a belt drive motor BSG and a BSG controller; the BSG is connected with an engine in the power system through a belt, the BSG controller is respectively connected with the BSG and a high-voltage component in the power system, and the BSG controller is connected with a power battery in the power system through a main contactor in the power system;
the method comprises the following steps:
acquiring state information of the vehicle in the running process;
determining the current control demand of the vehicle according to the state information; wherein the control demand comprises at least: starting the engine, stopping the engine, and boosting the engine;
and controlling the BSG according to the control requirement.
According to the control method of the vehicle power system provided by the embodiment of the invention, the control requirements of starting the engine, pulling the engine off, boosting the engine and the like are realized through the BSG, so that the low-voltage starter is not simply relied on, the starting, pulling the engine off, boosting and the like of the engine by using the low-voltage starter are reduced, the service life of the low-voltage starter is prolonged, and the performance, the driving performance and the user experience of the vehicle are improved.
According to one embodiment of the present invention, the controlling the BSG according to the control demand when the control demand is to start the engine includes: controlling the BSG to output a forward first torque to pull up the engine with the forward first torque; after the engine ignition is successful, controlling the BSG to stop outputting the forward first torque.
According to one embodiment of the present invention, the controlling the BSG according to the control demand when the control demand is to pull-stop the engine includes: controlling the BSG to output a reverse torque to pull-stop the engine with the reverse torque; controlling and recovering electric energy output by a motor in the power system in the engine pull-stop process; and detecting the rotating speed of the engine, and controlling the BSG to stop outputting the reverse torque when the rotating speed is reduced to a set value.
According to one embodiment of the present invention, when the control demand is to power the engine, the controlling the BSG according to the control demand includes: controlling the BSG to output a positive second torque to boost torque of the engine by the positive second torque; and detecting whether the current torque of the engine exceeds a preset torque, and controlling the BSG to stop outputting the forward second torque if the current torque exceeds the preset torque.
According to an embodiment of the present invention, after acquiring the state information during the driving of the vehicle, the method further includes: and extracting the state information of the BSG from the state information, and determining that the BSG is not in a fault state according to the state information.
According to an embodiment of the invention, the control method of the vehicular power system further includes: detecting whether the power battery has a fault or not in the driving process of the vehicle, and if the power battery has the fault, controlling to disconnect the connection between the power battery and the BSG controller; controlling a low-pressure starter in the power system to start the engine so as to drive the BSG to run through the engine; and acquiring a target voltage of the vehicle, controlling the BSG to output the target voltage, and inputting the target voltage into the high-voltage component.
According to an embodiment of the invention, the control method of the vehicular power system further includes: and identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matched with the power generation working condition, and performing power generation control according to the power generation strategy.
In order to achieve the above object, a second aspect of the present invention provides a control device for a vehicle powertrain, which is used in the vehicle powertrain, and includes: a belt drive motor BSG and a BSG controller; the BSG is connected with an engine in the power system through a belt, the BSG controller is respectively connected with the BSG and a high-voltage component in the power system, and the BSG controller is connected with a power battery in the power system through a main contactor in the power system;
the control device of the vehicle power system includes:
the acquisition module is used for acquiring state information in the running process of the vehicle;
the determining module is used for determining the current control requirement of the vehicle according to the state information; wherein the control demand comprises at least: starting the engine, stopping the engine, and boosting the engine;
and the first control module is used for controlling the BSG according to the control requirement.
According to the control device of the vehicular power system proposed by the embodiment of the invention, the control demand includes at least: the engine, the pull-stop engine and the power-assisted engine are started, the BSG is controlled through the first control module according to control requirements, different requirements of the engine are met through the BSG, so that the low-voltage starter is not needed to be relied on, the starting, pull-stop, power assisting and the like of the engine by the low-voltage starter are reduced, the service life of the low-voltage starter is prolonged, and the performance, driving performance and user experience of a vehicle are improved.
According to an embodiment of the present invention, the first control module is specifically configured to: controlling the BSG to output a forward first torque to pull up the engine through the forward first torque when the control demand is to start the engine; after the engine ignition is successful, controlling the BSG to stop outputting the forward first torque.
According to an embodiment of the present invention, the first control module is specifically configured to: when the control demand is to pull-stop the engine, controlling the BSG to output a reverse torque so as to pull-stop the engine by the reverse torque; controlling and recovering electric energy output by a motor in the power system in the engine pull-stop process; and detecting the rotating speed of the engine, and controlling the BSG to stop outputting the reverse torque when the rotating speed is reduced to a set value.
According to an embodiment of the present invention, the first control module is specifically configured to: when the control demand is power-assisted to the engine, controlling the BSG to output a positive second torque so as to increase the torque of the engine through the positive second torque; and detecting whether the current torque of the engine exceeds a preset torque, and controlling the BSG to stop outputting the forward second torque if the current torque exceeds the preset torque.
According to an embodiment of the present invention, the control apparatus of a vehicular power system further includes: the first fault identification module is used for extracting the state information of the BSG from the state information after the state information of the vehicle in the running process is obtained, and determining that the BSG is not in a fault state according to the state information.
According to an embodiment of the present invention, the control apparatus of a vehicular power system further includes: the second fault identification module is used for detecting whether the power battery has a fault or not in the running process of the vehicle, and if the power battery has the fault, the connection between the power battery and the BSG controller is controlled to be disconnected; the second control module is used for controlling a low-voltage starter in the power system to start the engine so as to drive the BSG to operate through the engine, obtain a target voltage of the vehicle, control the BSG to output the target voltage and input the target voltage into the high-voltage component.
According to an embodiment of the present invention, the control apparatus of a vehicular power system further includes: and the power generation control module is used for identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matched with the power generation working condition and performing power generation control according to the power generation strategy.
To achieve the above object, an embodiment of a third aspect of the invention proposes a vehicle including: the control device of the vehicular power system according to the embodiment of the second aspect of the invention.
To achieve the above object, a fourth aspect of the present invention provides an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method of the vehicle power system according to the first aspect of the present invention.
To achieve the above object, a fifth aspect embodiment of the present invention proposes a non-transitory computer-readable storage medium having stored thereon a computer program, which is executed by a processor, to implement the control method of a vehicle power system according to the first aspect embodiment of the present invention.
Drawings
FIG. 1 is a schematic block diagram of a powertrain system of a vehicle according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling a vehicle powertrain according to one embodiment of the present invention;
FIG. 3 is a flowchart illustrating a control method of a vehicle dynamics control system according to an embodiment of the present invention;
FIG. 4 is a flow chart schematic of a method of controlling a vehicle powertrain according to another embodiment of the present invention;
FIG. 5 is a flow chart schematic of a method of controlling a vehicle powertrain according to another embodiment of the present invention;
FIG. 6 is a flowchart illustrating a control method of a vehicle dynamics control system according to another embodiment of the present invention;
FIG. 7 is a block diagram of a control device of a vehicle powertrain according to one embodiment of the present invention;
FIG. 8 is a schematic structural diagram illustrating an alternative control arrangement for a vehicle powertrain, according to an embodiment of the present invention;
FIG. 9 is a block diagram of a vehicle according to one embodiment of the present invention;
FIG. 10 is a block diagram of an electronic device in accordance with one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a control method and device of a vehicle power system and a vehicle according to an embodiment of the invention with reference to the accompanying drawings.
FIG. 1 is a schematic block diagram of a vehicle powertrain according to one embodiment of the present invention.
As shown in fig. 1, the power system of the vehicle includes: the system comprises an engine 1, a low-voltage starter 7, a clutch 4, a motor 3, a transmission 5, a motor controller, a power battery 2, a main contactor 9, a high-voltage component 10, other high-voltage components, a belt driving motor BSG6 and a BSG controller 8. The engine 1 is respectively connected with the low-voltage starter 7 and the clutch 4, the motor 3 is respectively connected with the clutch 4, the transmission 5 and the motor controller, the motor controller is connected with the main contactor 9, the high-voltage component 10 and other high-voltage components are connected with the main contactor 9, the BSG6 is connected with the engine 1 in the power system through a belt, the BSG controller 8 is respectively connected with the BSG6 and the high-voltage components in the power system, and the BSG controller 8 is connected with the power battery 2 in the power system through the main contactor 9 in the power system.
Compared with the prior art, the vehicle power system is additionally provided with the belt driving motor BSG6 and the BSG controller 8. The belt driving motor BSG6 is directly connected with the engine 1 through a belt, so that the transmission chain for power generation is greatly shortened, and series power generation can be realized; the engine 1 is directly connected with the belt driving motor BSG6, and the BSG controller 8 is respectively connected with the BSG6 and the high-voltage component 10 and other high-voltage components in the power system, so that after the power battery fails, the BSG controller 8 can control the power battery to ensure that part or all of the high-voltage components can still work.
FIG. 2 is a flow chart of a method of controlling a vehicle powertrain according to one embodiment of the present invention. The control method of the vehicle power system provided by the embodiment of the invention is used for controlling the power system in FIG. 1.
As shown in fig. 2, the control method of the vehicular power system includes the steps of:
and S101, acquiring state information of the vehicle in the running process.
In the embodiment of the invention, the state information of the vehicle in the driving process can be acquired, for example, the state information may include a driving mode of the vehicle, a residual capacity of a power battery or a state of part of hardware in the vehicle, such as a state of a clutch, a rotation speed of a motor, a driving speed of the vehicle, and the like.
The driving mode of the vehicle can be obtained by recognition of an on-board controller, the remaining capacity of the power battery can be obtained by a battery management unit of the power battery, the state of part of hardware in the vehicle can be obtained by a sensor and a controller of the corresponding hardware, for example, the state of the clutch can be obtained by a clutch controller, the rotating speed of the motor can be obtained by a rotating speed sensor arranged on the motor, and the running speed of the vehicle can be obtained by a speed sensor arranged on a wheel.
S102, determining the current control requirement of the vehicle according to the state information; wherein the control requirements include at least: starting the engine, pulling the engine off, and boosting the engine.
In the embodiment of the invention, different identification strategies are set for different control requirements in advance, wherein the identification strategies comprise conditions which need to be met by the state information of the vehicle under the control requirements. Optionally, after the state information of the vehicle is obtained, the state information of the vehicle may be compared with the identification strategies corresponding to different control requirements, and the current control requirement of the vehicle is determined according to the comparison result. The control demands may include at least starting the engine, pull-stopping the engine, and boosting the engine.
It should be noted that the control demand may also be other control demands, and accordingly other control demands have other identification strategies, and the control demands are only examples and cannot be used as limitations of the control demands.
And S103, controlling the BSG according to the control requirement.
It should be noted that, in the embodiment of the present invention, because different control requirements require different control over the BSG, in addition to directly controlling the BSG according to the control requirements, a control policy may be further obtained according to the control requirements, and then the BSG is controlled according to the control policy, specifically, a mapping relationship between the control requirements and the control policy of the BSG may be pre-established. After the control requirement is acquired, the mapping relationship may be queried to obtain a BSG control policy that matches the control requirement acquired in S102. After the per-control strategy is obtained, the BSG can be controlled according to the control strategy.
When the control demand is to start the engine, the BSG is controlled to output a forward first torque to pull the engine to rotate by the forward first torque to ignite. Under the drive of the first torque, the engine can rotate gradually, and ignition can be successful when the rotating speed reaches a certain value. After the engine ignition is successful, indicating that the engine has been successfully started, the BSG may be controlled to stop outputting the forward first torque.
When the control demand is to pull the engine off, the BSG is controlled to output reverse torque so as to pull the engine off through the reverse torque. In the process of pulling the engine off, the rotating speed of the engine is continuously reduced, but the motor still outputs electric energy because the engine does not completely stop running, so that in order to avoid the waste of the output electric energy, the embodiment of the invention can control and recycle the electric energy output by the motor in the process of pulling the engine off. Specifically, an energy recovery instruction may be sent to the motor controller, so that the motor controller stores energy output by the motor during the engine pull-stop process into the power battery according to the recovery instruction.
Further, during the engine stopping process, the rotation speed of the engine may be continuously detected, for example, a rotation speed sensor is provided on the engine, and the current rotation speed of the engine is detected by the rotation speed sensor. When the rotating speed is reduced to a set value, the engine gradually approaches to stop, and the engine finally stops under the driving of the residual reverse torque, so that the BSG can be controlled to stop outputting the reverse torque.
And when the control demand is the power-assisted engine, controlling the BSG to output the positive second torque so as to increase the torque of the engine through the positive second torque. In the embodiment of the invention, the power corresponding to the torque output by the current engine cannot meet the requirement of the vehicle on the power, and the engine needs to be assisted in order to meet the requirement of the vehicle on the power, so that a positive second torque can be output through the BSG to accelerate the rotation of the engine through the second torque, and a larger torque can be provided for the vehicle to provide more power.
Further, after the engine is assisted by the BSG for a period of time, the torque output by the engine can meet the requirement of the vehicle, and the engine does not need to be assisted continuously when the requirement is met, so that whether the current torque of the engine exceeds the preset torque or not can be detected, if the current torque exceeds the preset torque, the torque output by the engine can meet the requirement of the vehicle, the BSG can be controlled to stop outputting the forward second torque, and the energy waste is avoided.
According to the control method of the vehicle power system provided by the embodiment of the invention, the state information in the vehicle running process is obtained; determining the current control demand of the vehicle according to the state information; wherein the control requirements include at least: starting the engine, pulling the engine to stop and the power-assisted engine, and controlling the BSG according to the control requirement. In this embodiment, control BSG based on the control demand, realize the different demands of engine through BSG to can no longer rely on low pressure starter purely, reduce the start or the stopping etc. of using low pressure starter to the engine, thereby can avoid reducing the life-span of low pressure starter, reduce the response to vehicle performance. And the engine is not started or stopped by using a low-voltage starter, so that the noise output can be reduced, the pollution of noise to the environment is reduced, and the driving performance of the vehicle and the vehicle using feeling of a user are improved.
For clarity of the above embodiments, a detailed description is provided below with reference to fig. 3.
Fig. 3 is a flowchart illustrating a control method of a vehicle power control system according to an embodiment of the present invention, and as shown in fig. 3, the control method of the vehicle power control system includes the steps of:
s201, start.
S202, acquiring the state information of the vehicle in the running process.
For a detailed description of S202, reference may be made to the description of relevant contents in the above embodiment S101, and details are not repeated here.
S203, judging whether the BSG is in a fault state.
In the embodiment of the invention, the state information comprises the state information of the BSG. After the state information is acquired, the state information of the BSG may be extracted from the state information, and then, according to the state information of the BSG, it is determined whether the BSG is in a failure state.
If the BSG is not in the fault state, executing S204; if the BSG is in a failed state, S214 is entered, and then S215 is entered.
And S204, judging whether the engine needs to be started or not.
In the embodiment of the invention, whether the state information of the vehicle meets the condition for starting the engine needs to be judged. For example, switching the entire vehicle to the HEV mode or the power battery remaining amount SOC being so low that power generation is required is one condition for starting the engine. Taking this condition as an example, if the whole vehicle is switched to the HEV mode or the remaining power SOC of the power battery is low enough to require power generation, the engine needs to be started; if the HEV mode of the whole vehicle which is not switched and the residual charge SOC of the power battery are not low enough to need power generation, the engine does not need to be started.
If the engine needs to be started, the process goes to step S207; if the engine does not need to be started, the process goes to step S205;
and S205, judging whether the engine needs to be pulled and stopped.
In the embodiment of the invention, whether the state information of the vehicle meets the condition of pulling and stopping the engine or not needs to be judged. For example, switching the entire vehicle to the EV mode is one condition for pulling the engine off. Taking this condition as an example, if the entire vehicle is switched to the EV mode, the engine needs to be pulled off; if the whole vehicle is not switched to the EV mode from other modes, the engine does not need to be pulled and stopped.
If the engine needs to be stopped, the process goes to step S209; if the engine does not need to be pulled down, the process proceeds to step S206.
And S206, judging whether the engine needs to be assisted.
In the embodiment of the invention, whether the state information of the vehicle meets the condition of the power-assisted engine needs to be judged. For example, it is a condition of an assisted engine that the entire vehicle requires acceleration but the engine cannot provide sufficient torque. Taking this condition as an example, if the entire vehicle needs to be accelerated but the engine cannot provide enough torque, the engine needs to be assisted; if the vehicle is accelerating and the engine is able to provide sufficient torque, then no power assist engine is required.
If the engine needs to be assisted, the process goes to step S212; if the engine assist is not required, the process proceeds to step S214.
S207, the BSG is controlled to output the positive first torque so as to pull up the engine through the positive first torque.
And S208, after the engine is ignited successfully, controlling the BSG to stop outputting the first positive torque.
For specific descriptions of the above S207 to S208, reference may be made to the descriptions of the relevant contents in the above embodiments, and details are not repeated here.
After controlling the BSG to stop outputting the forward first torque, the process proceeds to S215.
And S209, controlling the BSG to output reverse torque so as to pull the engine to stop through the reverse torque.
And S210, controlling to recover electric energy output by a motor in the power system in the process of pulling and stopping the engine.
And S211, detecting the rotating speed of the engine, and controlling the BSG to stop outputting the reverse torque after the rotating speed is reduced to a set value.
For specific descriptions of the above S209 to S211, reference may be made to the descriptions of the relevant contents in the above embodiments, and details are not repeated here.
After controlling the BSG to stop outputting the reverse torque, the process proceeds to step S215.
And S212, controlling the BSG to output the positive second torque so as to lift the torque of the engine through the positive second torque.
And S213, detecting whether the current torque of the engine exceeds the preset torque, and controlling the BSG to stop outputting the positive second torque if the current torque exceeds the preset torque.
For specific descriptions of the above S211 to S212, reference may be made to the descriptions of the relevant contents in the above embodiments, and the details are not repeated herein.
After controlling the BSG to stop outputting the positive second torque, the process proceeds to step S215.
S214: the process proceeds to step S215.
S215: and (6) ending.
According to the flow of the control method of the vehicle power system, the BSG is controlled based on the control requirement, and different requirements of the engine are realized through the BSG, so that the low-voltage starter is not simply relied on any more, the starting or stopping of the engine by using the low-voltage starter is reduced, the service life of the low-voltage starter is prevented from being shortened, and the response to the vehicle performance is reduced. And the engine is not started or stopped by using a low-voltage starter, so that the noise output can be reduced, the pollution of noise to the environment is reduced, and the driving performance of the vehicle and the vehicle using feeling of a user are improved.
Fig. 4 is a flowchart illustrating a control method of a vehicle powertrain according to another embodiment of the present invention. On the basis of the above embodiment, the method further includes the following steps:
s301, detecting whether the power battery has faults or not in the driving process of the vehicle.
In the embodiment of the invention, the power battery can be detected by the detection component of the power battery, and if the voltage of the power battery is not in the range of the rated normal working voltage of the power battery or the current generated by the power battery is not in the range of the rated normal working current of the power battery, the power battery breaks down. If the voltage of the power battery is within the rated normal working voltage range of the power battery and the current generated by the power battery is within the rated normal working current range of the power battery, the power battery normally works without voltage stabilization through the BSG.
And S302, if a fault occurs, controlling to disconnect the power battery from the BSG controller.
In the embodiment of the invention, when the power battery breaks down, the power battery cannot normally improve stable high voltage to ensure that the high-voltage component normally works, and the main contactor needs to be disconnected. When the main contactor is disconnected, the power battery is disconnected with the BSG controller and the high-voltage component, and the high-voltage component is only connected with the BSG controller.
And S303, controlling a low-voltage starter to start the engine so as to drive the BSG to run through the engine.
In the embodiment of the invention, when the power battery fails, the BSG is required to provide a power source so that the high-voltage component can work normally. After the main contactor between the BSG controller and the power battery is disconnected, the BSG cannot be driven by the power battery to operate. In the embodiment of the invention, as shown in fig. 1, the low-voltage starter is connected with the engine, and the BSG is connected with the engine through a belt. Therefore, in order to make the BSG continue to output high voltage for voltage stabilization, the low-voltage starter needs to be controlled to start the engine, and then the BSG is driven by the engine through the belt to operate, so that the BSG can provide power source for the high-voltage component.
And S304, acquiring a target voltage of the vehicle, controlling the BSG to output the target voltage, and inputting the target voltage into a high-voltage component.
In the embodiment of the invention, the vehicle signal can be received through the driving computer, and the target voltage of the vehicle can be obtained according to the state information of the vehicle. Then, after receiving the voltage stabilization control command and the target voltage of the whole vehicle, the BSG motor controller controls the BSG motor to dynamically adjust to maintain the actual voltage to be basically consistent with the target voltage, and inputs the voltage after voltage stabilization into the high-voltage component, so that the high-voltage component can normally work. When the whole vehicle does not need voltage stabilization or the power battery recovers to be normal, the BSG stops working and does not input voltage to the high-voltage component.
In the embodiment of the invention, when the power battery has a fault, the engine is driven to start by the low-voltage starter, the engine drives the BSG to run by the belt to provide a power source, then the BSG is dynamically regulated by the BSG controller according to the target voltage of the whole vehicle to maintain the actual voltage basically consistent with the target voltage, and then the voltage after voltage stabilization is input to the high-voltage component, so that the high-voltage component can normally work, and the high-voltage component can still stably work even if the power battery of the vehicle has a fault.
Fig. 5 is a flowchart illustrating a control method of a vehicle powertrain according to another embodiment of the present invention. On the basis of the above embodiment, the control method of the vehicle power system may further include a power generation control flow.
As shown in fig. 5, the control method of the vehicular power system includes:
s401, identifying the current power generation working condition of the vehicle.
In the embodiment of the invention, the vehicle can have modes of in-situ power generation, series-parallel power generation and the like. The power generation working condition can be identified by the vehicle speed, the gear state, the clutch state, the residual electric quantity SOC of the power battery and the like. Wherein, the vehicle speed can be obtained through a speed sensor arranged on the wheel, the gear state can be obtained through a gear controller, the state of the clutch can be obtained through the clutch controller, and the remaining capacity SOC of the power battery can be obtained through a battery management unit of the power battery 2.
The identification conditions of the in-situ power generation can be as follows: the residual electric quantity SOC of the power battery is lower than an SOC threshold value 1 or the clutch is in a disengaged state and the gear is in a P gear; the identification conditions for series power generation may be: the SOC of the residual electric quantity of the power battery is lower than an SOC threshold value 3, the vehicle speed is lower than a vehicle speed threshold value 1 or the clutch is in a disengaged state and the gear is not in a P gear; the identification condition of the series-parallel power generation can be; the SOC of the residual electric quantity of the power battery is lower than an SOC threshold value 5 and the vehicle speed is lower than a vehicle speed threshold value 3 or the clutch is in a combined state and the gear is not in a P gear;
when the residual electric quantity SOC of the vehicle power battery is lower than an SOC threshold value 1 or the clutch is in a disengaged state and the gear is in a P gear, the current power generation working condition of the vehicle is in-situ power generation; when the SOC of the residual electric quantity of the power battery is lower than an SOC threshold value 3 and the vehicle speed is lower than a vehicle speed threshold value 1 or the clutch is in a disengaged state and the gear is not a P gear, the power generation working condition of the vehicle is series power generation; when the SOC of the residual electric quantity of the power battery is lower than the SOC threshold value 5 and the vehicle speed is lower than the vehicle speed threshold value 3 or the clutch is in a combined state and the gear is not in the P gear, the power generation working condition of the vehicle is series-parallel power generation.
And S402, acquiring a power generation strategy matched with the power generation working condition.
In the embodiment of the invention, different control on the power generation modes may be required under different power generation working conditions, so that the mapping relation between the power generation working conditions and the power generation control strategy is established in advance. After the power generation working condition is obtained, the mapping relation can be inquired, and a power generation control strategy matched with the control requirement obtained in the step S401 is obtained.
And S403, performing power generation control according to the power generation strategy.
And when the electric control strategy is obtained, the electric control strategy can be used for power generation control.
When the power generation working condition is in-situ power generation, the engine drives the belt to drive the motor BSG to generate power with low power through the belt so as to meet the power consumption requirement of the whole vehicle under the static state or store redundant electric quantity into the power battery; when the SOC is higher than the SOC threshold value 2, the power generation is stopped. The clutch 4 is in a disengaged state.
When the power generation working condition is series power generation, the engine drives the belt to drive the motor BSG to generate power through the belt, and the generated power can be dynamically changed according to the requirement of the whole vehicle so as to compensate the power consumption of the whole vehicle in series running or store redundant electric quantity into a power battery; and when the SOC is higher than the SOC threshold value 4 or the vehicle speed is higher than the vehicle speed threshold value 2, stopping generating power. The clutch is in a disengaged state.
When the power generation working condition is series-parallel power generation, the engine drives the belt driving motor BSG to generate power through the belt and simultaneously provides power output, and the generated power can be dynamically changed according to the requirement of the whole vehicle so as to compensate the power consumption of the whole vehicle in series-parallel running or store redundant electric quantity into a power battery; the SOC is higher than the SOC threshold value 6 to stop the power generation. The clutch 4 is in an engaged state.
In the embodiment of the invention, the BSG and the BSG controller are added in the power system, so that the power system can realize the full power generation working condition, different power generation strategies are adopted under different power generation working conditions, the power generation of the vehicle is more flexible, the power generation of different strategies is carried out according to different conditions, the power generation of the vehicle is more reasonable, and the power generation efficiency of the vehicle can be improved.
For clarity of explanation of the above embodiments, a detailed description is provided below with reference to fig. 6.
Fig. 6 is a flowchart illustrating a control method of a vehicle power control system according to another embodiment of the present invention, as shown in fig. 6, the control method of the vehicle power control system including the steps of:
s501, start.
And S502, acquiring the state information of the vehicle in the running process.
For a detailed description of S502, reference may be made to the description of relevant contents in the above embodiment S101, and details are not repeated here.
S503, judging whether to allow power generation.
In the embodiment of the present invention, the condition for allowing discharge may be: the BSG has no failure.
If the BSG fails, the discharge is not allowed, and the process proceeds to step S513; if the BSG has not failed, the discharge is allowed, and the process proceeds to step S504.
S504, judging whether to generate power in situ.
If yes, go to step S507; if not, the process proceeds to step S505.
For a detailed description of the above S504, reference may be made to the description of relevant contents in the above embodiments, and details are not repeated here.
And S505, judging whether to generate power in series.
If yes, go to step S509; if not, the process proceeds to step S506.
For a detailed description of the above step S505, reference may be made to the description of the relevant contents in the above embodiments, which is not described herein again.
And S506, judging whether the hybrid power generation is carried out or not.
If yes, go to step S511; if not, the process proceeds to step S513.
For a detailed description of the above S506, reference may be made to the description of the relevant contents in the above embodiments, and details are not repeated here.
S507, the engine drives a belt driving motor BSG to perform low-power generation through a belt so as to meet the power demand of the whole vehicle in a static state or store redundant electric quantity into a power battery;
and S508, stopping power generation when the SOC is higher than the SOC threshold value 2. The clutch 4 is in a disengaged state.
And S509, the engine drives the belt to drive the motor BSG to generate power through the belt, and the generated power can be dynamically changed according to the requirement of the whole vehicle so as to compensate the power consumption of the whole vehicle in series running or store redundant electric quantity into a power battery.
And S510, stopping power generation when the SOC is higher than the SOC threshold value 4 or the vehicle speed is higher than the vehicle speed threshold value 2. The clutch is in a disengaged state.
And S511, the engine drives the belt driving motor BSG to generate power through the belt and simultaneously provides power output, and the generated power can be dynamically changed according to the requirement of the whole vehicle so as to compensate the power consumption of the whole vehicle in series-parallel running or store redundant electric quantity into a power battery.
And S512, stopping generating power when the SOC is higher than the SOC threshold value 6. The clutch 4 is in an engaged state.
And S513, generating no power.
And S514, ending.
According to the control method of the vehicle power system provided by the embodiment of the invention, the BSG is controlled based on the control requirement, and different requirements of the engine are realized through the BSG, so that the low-voltage starter is not simply relied any more, the starting or stopping of the engine by using the low-voltage starter is reduced, the service life of the low-voltage starter is prevented from being shortened, and the response to the vehicle performance is reduced. And the engine is not started or stopped by using a low-voltage starter, so that the noise output can be reduced, the pollution of noise to the environment is reduced, and the driving performance of the vehicle and the vehicle using feeling of a user are improved. And moreover, a power generation strategy matched with the power generation working condition can be obtained according to the power generation working condition, and power generation control is carried out according to the power generation strategy, so that the power generation efficiency of the vehicle can be improved, and full-working-condition power generation is realized.
Fig. 7 is a structural diagram of a control apparatus of a vehicle powertrain according to one embodiment of the invention. In a powertrain for a vehicle, the powertrain comprising: a belt drive motor BSG and a BSG controller; the BSG is connected with an engine in the power system through a belt, the BSG controller is respectively connected with the BSG and a high-voltage component in the power system, and the BSG controller is connected with a power battery in the power system through a main contactor in the power system;
as shown in fig. 7, the control device of the vehicular power system includes:
the acquiring module 21 is used for acquiring state information in the running process of the vehicle;
a determining module 22, configured to determine a current control demand of the vehicle according to the state information; wherein the control requirements include at least: starting the engine, pulling the engine to stop and boosting the engine;
the first control module 23 is configured to control the BSG according to a control requirement.
It should be noted that the foregoing explanation of the embodiment of the control method of the vehicle powertrain is also applicable to the control device of the vehicle powertrain of this embodiment, and will not be repeated herein.
According to the control method of the vehicle power system provided by the embodiment of the invention, the state information in the vehicle running process is obtained; determining the current control demand of the vehicle according to the state information; wherein the control requirements include at least: starting the engine, pulling the engine to stop and the power-assisted engine, and controlling the BSG according to the control requirement. In this embodiment, control BSG based on the control demand, realize the different demands of engine through BSG to can no longer rely on low pressure starter purely, reduce the start or the stopping etc. of using low pressure starter to the engine, thereby can avoid reducing the life-span of low pressure starter, reduce the response to vehicle performance. And the engine is not started or stopped by using a low-voltage starter, so that the noise output can be reduced, the pollution of noise to the environment is reduced, and the driving performance of the vehicle and the vehicle using feeling of a user are improved.
Further, the first control module 23 is further configured to: when the control demand is starting the engine, controlling the BSG to output a forward first torque so as to pull up the engine through the forward first torque; after the engine ignition is successful, the BSG is controlled to stop outputting the first forward torque.
Further, in a possible implementation manner of the embodiment of the present invention, the first control module 23 is specifically configured to: when the control requirement is to pull the engine to stop, the BSG is controlled to output reverse torque so as to pull the engine to stop through the reverse torque; controlling and recovering electric energy output by a motor in the power system in the process of pulling and stopping the engine; the rotating speed of the engine is detected, and when the rotating speed is reduced to a set value, the BSG is controlled to stop outputting the reverse torque.
Further, in a possible implementation manner of the embodiment of the present invention, the first control module 23 is specifically configured to: when the control demand is the power-assisted engine, controlling the BSG to output a positive second torque so as to improve the torque of the engine through the positive second torque; and detecting whether the current torque of the engine exceeds the preset torque, and controlling the BSG to stop outputting the forward second torque if the current torque exceeds the preset torque.
Further, fig. 8 is a schematic structural diagram of another control device of a vehicle powertrain according to an embodiment of the present invention. On the basis of fig. 7, the control device of the vehicle power system according to the embodiment of the present invention further includes: a first fault identification module 24, a second fault identification module 25, a power generation control module 26, and a second control module 27.
The first fault identification module 24 is configured to, after obtaining the state information of the vehicle in the driving process, extract the state information of the BSG from the state information, and determine that the BSG is not in a fault state according to the state information.
And the second fault identification module 25 is used for detecting whether the power battery has a fault or not in the driving process of the vehicle, and controlling to disconnect the power battery from the BSG controller if the power battery has the fault.
And the second control module 27 is used for controlling a low-voltage starter in the power system to start the engine, so that the BSG is driven by the engine to operate, the target voltage of the vehicle is obtained, the BSG is controlled to output the target voltage, and the target voltage is input to the high-voltage component.
And the power generation control module 26 is used for identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matched with the power generation working condition, and performing power generation control according to the power generation strategy.
It should be noted that the foregoing explanation of the embodiment of the control method of the vehicle powertrain is also applicable to the control device of the vehicle powertrain of this embodiment, and will not be repeated herein.
According to the control method of the vehicle power system provided by the embodiment of the invention, the state information in the vehicle running process is obtained; determining the current control demand of the vehicle according to the state information; wherein the control requirements include at least: starting the engine, pulling the engine to stop and the power-assisted engine, and controlling the BSG according to the control requirement. In this embodiment, control BSG based on the control demand, realize the different demands of engine through BSG to can no longer rely on low pressure starter purely, reduce the start or the stopping etc. of using low pressure starter to the engine, thereby can avoid reducing the life-span of low pressure starter, reduce the response to vehicle performance. And the engine is not started or stopped by using a low-voltage starter, so that the noise output can be reduced, the pollution of noise to the environment is reduced, and the driving performance of the vehicle and the vehicle using feeling of a user are improved. The vehicle can acquire the power generation strategy matched with the power generation working condition according to the power generation working condition, and performs power generation control according to the power generation strategy, so that the power generation efficiency of the vehicle can be improved, and full-working-condition power generation is realized. And moreover, a power generation strategy matched with the power generation working condition can be obtained according to the power generation working condition, and power generation control is carried out according to the power generation strategy, so that the power generation efficiency of the vehicle can be improved, and full-working-condition power generation is realized.
In order to implement the above embodiment, the embodiment of the present invention further provides a vehicle 200, as shown in fig. 9, including the control device 100 of the vehicle powertrain shown in the above embodiment.
In order to implement the above embodiments, the embodiment of the present invention further provides an electronic device, as shown in fig. 10, which includes a memory 31 and a processor 32. The memory 31 has stored thereon a computer program operable on the processor 32, and the processor 32 executes the program to implement the control method of the vehicle powertrain system as shown in the above-described embodiments.
In order to achieve the above embodiments, embodiments of the present invention also propose a non-transitory computer-readable storage medium having stored thereon a computer program, which is executed by a processor, for implementing the control method of the vehicle power system as shown in the above embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (17)
1. A control method of a vehicular power system characterized in that the vehicular power system includes: a belt drive motor BSG and a BSG controller; the BSG is connected with an engine in the power system through a belt, the BSG controller is respectively connected with the BSG and a high-voltage component in the power system, and the BSG controller is connected with a power battery in the power system through a main contactor in the power system;
the method comprises the following steps:
acquiring state information of the vehicle in the running process;
determining the current control demand of the vehicle according to the state information; wherein the control demand includes at least one of starting the engine, stopping the engine, and boosting the engine;
and controlling the BSG according to the control requirement.
2. The control method of a vehicle powertrain as claimed in claim 1, wherein said controlling the BSG according to the control demand when the control demand is starting the engine comprises:
controlling the BSG to output a forward first torque to pull up the engine with the forward first torque;
after the engine ignition is successful, controlling the BSG to stop outputting the forward first torque.
3. The control method of a vehicle powertrain as claimed in claim 1, wherein said controlling the BSG according to the control demand when the control demand is pulling the engine off comprises:
controlling the BSG to output a reverse torque to pull-stop the engine with the reverse torque;
controlling and recovering electric energy output by a motor in the power system in the engine pull-stop process;
and detecting the rotating speed of the engine, and controlling the BSG to stop outputting the reverse torque when the rotating speed is reduced to a set value.
4. The control method of a vehicle powertrain as claimed in claim 1, wherein said controlling the BSG according to the control demand when the control demand is to assist the engine comprises:
controlling the BSG to output a positive second torque to boost torque of the engine by the positive second torque;
and detecting whether the current torque of the engine exceeds a preset torque, and controlling the BSG to stop outputting the forward second torque if the current torque exceeds the preset torque.
5. The control method of a vehicular power system according to any one of claims 1 to 4, characterized by further comprising, after the acquiring of the state information during running of the vehicle:
and extracting the state information of the BSG from the state information, and determining that the BSG is not in a fault state according to the state information.
6. The control method of a vehicular power system according to any one of claims 1 to 4, characterized by further comprising:
detecting whether the power battery has a fault or not in the driving process of the vehicle, and if the power battery has the fault, controlling to disconnect the connection between the power battery and the BSG controller;
controlling a low-pressure starter in the power system to start the engine so as to drive the BSG to run through the engine;
and acquiring a target voltage of the vehicle, controlling the BSG to output the target voltage, and inputting the target voltage into the high-voltage component.
7. The control method of a vehicular power system according to any one of claims 1 to 4, characterized by further comprising:
and identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matched with the power generation working condition, and performing power generation control according to the power generation strategy.
8. A control apparatus for a vehicular power system, characterized by being used in a power system of the vehicle, the power system comprising: a belt drive motor BSG and a BSG controller; the BSG is connected with an engine in the power system through a belt, the BSG controller is respectively connected with the BSG and a high-voltage component in the power system, and the BSG controller is connected with a power battery in the power system through a main contactor in the power system;
the control device of the vehicle power system includes:
the acquisition module is used for acquiring state information in the running process of the vehicle;
the determining module is used for determining the current control requirement of the vehicle according to the state information; wherein the control demand comprises at least: starting the engine, stopping the engine, and boosting the engine;
and the first control module is used for controlling the BSG according to the control requirement.
9. The control device of a vehicle powertrain according to claim 8, characterized in that the first control module is specifically configured to:
controlling the BSG to output a forward first torque to pull up the engine through the forward first torque when the control demand is to start the engine;
after the engine ignition is successful, controlling the BSG to stop outputting the forward first torque.
10. The control device of a vehicle powertrain according to claim 8, characterized in that the first control module is specifically configured to:
when the control demand is to pull-stop the engine, controlling the BSG to output a reverse torque so as to pull-stop the engine by the reverse torque;
controlling and recovering electric energy output by a motor in the power system in the engine pull-stop process;
and detecting the rotating speed of the engine, and controlling the BSG to stop outputting the reverse torque when the rotating speed is reduced to a set value.
11. The control device of a vehicle powertrain according to claim 8, characterized in that the first control module is specifically configured to:
when the control demand is power-assisted to the engine, controlling the BSG to output a positive second torque so as to increase the torque of the engine through the positive second torque;
and detecting whether the current torque of the engine exceeds a preset torque, and controlling the BSG to stop outputting the forward second torque if the current torque exceeds the preset torque.
12. The control device of a vehicular power system according to any one of claims 8 to 11, characterized by further comprising:
the first fault identification module is used for extracting the state information of the BSG from the state information after the state information of the vehicle in the running process is obtained, and determining that the BSG is not in a fault state according to the state information.
13. The control device of a vehicular power system according to any one of claims 8 to 11, characterized by further comprising:
the second fault identification module is used for detecting whether the power battery has a fault or not in the running process of the vehicle, and if the power battery has the fault, the connection between the power battery and the BSG controller is controlled to be disconnected;
and the second control module is used for controlling a low-voltage starter in the power system to start the engine, so that the engine drives the BSG to operate, the target voltage of the vehicle is obtained, the BSG is controlled to output the target voltage, and the target voltage is input to the high-voltage component.
14. The control device of a vehicular power system according to any one of claims 8 to 11, characterized by further comprising:
and the power generation control module is used for identifying the current power generation working condition of the vehicle, acquiring a power generation strategy matched with the power generation working condition and performing power generation control according to the power generation strategy.
15. A vehicle, characterized by comprising: the control device of the vehicular power system according to any one of claims 8 to 14.
16. An electronic device comprising a memory, a processor;
wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing the control method of the vehicle power system according to any one of claims 1 to 7.
17. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements a control method of a vehicle powertrain according to any one of claims 1-7.
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