CN113047966A - Method and system for adjusting braking power in engine cylinder and related device - Google Patents
Method and system for adjusting braking power in engine cylinder and related device Download PDFInfo
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- CN113047966A CN113047966A CN202110239477.5A CN202110239477A CN113047966A CN 113047966 A CN113047966 A CN 113047966A CN 202110239477 A CN202110239477 A CN 202110239477A CN 113047966 A CN113047966 A CN 113047966A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0005—Controlling intake air during deceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The embodiment of the application discloses a method, a system and a related device for adjusting braking power in an engine cylinder, which are used for improving the adaptability of the engine to braking power under different environmental conditions such as plains, plateaus and the like and ensuring the driving safety of vehicles. The method in the embodiment of the application comprises the following steps: obtaining engine operating parameters; judging whether the in-cylinder braking of the engine is activated or not according to the engine operation parameters; if not, controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy; if yes, calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine; and controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
Description
Technical Field
The embodiment of the application relates to the field of engines, in particular to a method and a system for adjusting braking power in an engine cylinder and a related device.
Background
In the driving process of the vehicle, a driver can take braking measures according to actual driving conditions to control the vehicle to decelerate, so that traffic accidents are avoided, and driving safety is guaranteed. The braking mode of the vehicle is various, the in-cylinder braking is an auxiliary braking mode, and the reduction rate of the rotating speed of the engine is improved by controlling the air intake and exhaust amount of the engine, so that the vehicle speed can be reduced as fast as possible, and the probability of traffic accidents is reduced.
The principle of in-cylinder braking is that when the compression process of an engine is about to end, high-pressure gas generated by compression is released quickly by opening an exhaust valve, then the exhaust valve is closed quickly, at the moment, only a small amount of gas exists in the cylinder, a piston descends in the working stage of the engine, the cylinder is in a negative pressure state, the gas can prevent the piston from descending, and a torque effect in the opposite direction of a crankshaft is generated, so that a braking effect is generated.
During the braking process of the engine, the power required for compressing air in the cylinder completely comes from the kinetic energy or potential energy of a running vehicle and a rotating crankshaft, the larger the air intake quantity is, the larger the air quantity in the cylinder is, the larger the compression resistance is, the larger the corresponding braking power in the cylinder is, and otherwise, the smaller the braking power is. In the prior art, the air inflow in the braking process cannot be adjusted, so that the braking power in a cylinder cannot be adjusted, and the situation that the braking power is too large or too small can occur, so that the braking time of a vehicle is too short or too long, and the driving safety of the vehicle is not facilitated.
Disclosure of Invention
In order to solve the technical problem, embodiments of the present application provide a method, a system, and a related device for adjusting braking power in an engine cylinder, which are used to improve the adaptability of the engine to braking power under different environmental conditions, such as on plain and plateau, and ensure the driving safety of a vehicle.
In a first aspect, an embodiment of the present application provides a method for adjusting braking power in an engine cylinder, including:
obtaining engine operating parameters;
judging whether the in-cylinder braking of the engine is activated or not according to the engine operation parameters;
if not, controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
if yes, calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
Optionally, the controlling the throttle valve of the engine and/or the EGR valve according to the target opening strategy comprises:
controlling the throttle valve and/or the EGR valve to be adjusted to a first opening degree according to the target opening degree strategy;
when the throttle valve and/or the EGR valve is/are at a first opening degree and the in-cylinder braking power of the engine meets a preset technical index, controlling the throttle valve and/or the EGR valve to be kept at the first opening degree;
and when the throttle valve and/or the EGR valve are/is under a first opening degree and the in-cylinder braking power of the engine does not meet the preset technical index, controlling the throttle valve and/or the EGR valve to be adjusted to a second opening degree from the first opening degree, wherein the second opening degree is the opening degree calibrated by the target opening degree strategy.
Optionally, the engine operating parameters include the circulating oil quantity, the rotating speed and the in-cylinder brake switch state of the engine.
Optionally, the determining whether in-cylinder braking of the engine is activated according to the engine operating parameter includes:
judging whether the in-cylinder brake switch state of the engine is a set state or not;
if the in-cylinder brake switch state is determined to be the set state, judging whether the circulating oil quantity of the engine is smaller than a preset oil quantity or not;
if the circulating oil quantity of the engine is smaller than the preset oil quantity, judging whether the rotating speed of the engine is larger than the preset rotating speed;
and if the rotating speed of the engine is determined to be greater than the preset rotating speed, determining that in-cylinder braking of the engine is activated.
A second aspect of the present application provides a system for adjustable in-cylinder braking power of an engine, comprising:
the acquisition unit is used for acquiring engine operating parameters;
the judging unit is used for judging whether the in-cylinder brake of the engine is activated or not according to the engine operation parameters;
the first control unit is used for controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy when the judgment result of the judgment unit is negative;
the calling unit is used for calling a target opening strategy when the judgment result of the judgment unit is yes, and the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and the second control unit is used for controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, and the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
Optionally, the second control unit is specifically configured to:
controlling the throttle valve and/or the EGR valve to be adjusted to a first opening degree according to the target opening degree strategy;
when the throttle valve and/or the EGR valve is/are at a first opening degree and the in-cylinder braking power of the engine meets a preset technical index, the second control unit controls the throttle valve and/or the EGR valve to be kept at the first opening degree;
and when the throttle valve and/or the EGR valve are/is under a first opening degree and the in-cylinder braking power of the engine does not meet the preset technical index, the second control unit controls the throttle valve and/or the EGR valve to be adjusted from the first opening degree to a second opening degree, and the second opening degree is the opening degree calibrated by the target opening degree strategy.
Optionally, the obtaining unit is specifically configured to obtain a circulating oil amount, a rotation speed, and a brake switch state in the cylinder of the engine.
Optionally, the determining unit includes:
the first judgment module is used for judging whether the in-cylinder brake switch state of the engine is a set state or not;
the second judgment module is used for judging whether the circulating oil quantity of the engine is smaller than a preset oil quantity or not when the first judgment module determines that the in-cylinder brake switch state is a set state;
the third judging module is used for judging whether the rotating speed of the engine is greater than the preset rotating speed or not when the second judging module determines that the circulating oil quantity of the engine is less than the preset oil quantity;
and the determining module is used for determining that in-cylinder braking of the engine is activated when the third judging module determines that the rotating speed of the engine is greater than the preset rotating speed.
A third aspect of the present application provides an apparatus for adjusting in-cylinder braking power of an engine, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the processor specifically performs the following operations:
obtaining engine operating parameters;
judging whether the in-cylinder braking of the engine is activated or not according to the engine operation parameters;
if not, controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
if yes, calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
A fourth aspect of the present application provides a computer storage readable storage medium having a program stored thereon, which when executed on a computer performs the method of any one of the first aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
by judging whether the in-cylinder brake is activated or not, when the in-cylinder brake of the electronic control unit of the engine is activated, a throttle valve and an EGR valve of the engine are controlled according to a target opening strategy calibrated by a bench test, so that the amount of compressed air in the in-cylinder brake process is adjusted, the in-cylinder brake power is adjusted, and the in-cylinder brake power meets technical indexes.
The target opening degree strategy is that different opening degree values are calibrated according to different rotating speeds, different environmental pressures and different environmental temperatures of the engine, so that the adaptability of the engine to braking power under different environmental conditions such as plains, plateaus and the like is improved, and the driving safety of the vehicle is ensured.
Drawings
FIG. 1 is a schematic flow chart illustrating an embodiment of a method for adjusting in-cylinder braking power of an engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating another embodiment of a method for adjusting in-cylinder braking power of an engine according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram illustrating an embodiment of a system for adjusting in-cylinder braking power of an engine according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another embodiment of a system for adjusting in-cylinder braking power of an engine according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an embodiment of a device for adjusting braking power in an engine cylinder according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the application provides a method, a system and a related device for adjusting braking power in an engine cylinder, which are used for improving the adaptability of the engine to braking power under different environmental conditions such as plains, plateaus and the like and ensuring the driving safety of vehicles.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The method of the present application is applied to an electronic control unit of an engine or other devices having logic processing capability, and the present application is not limited thereto.
Referring to fig. 1, an embodiment of a method for adjusting in-cylinder braking power of an engine according to the present disclosure includes:
101. obtaining engine operating parameters;
when the braking in the cylinder of the engine is activated, the purpose of adjusting the braking power in the cylinder is achieved by adjusting the amount of compressed air in the cylinder, so that the braking power in the cylinder meets the technical index requirement, namely the braking power required by the braking of the vehicle under the current working condition is met. In order to judge whether the in-cylinder brake of the engine is activated, the electronic engine control unit needs to acquire various parameter values of the engine in the running process in real time, and determine whether the in-cylinder brake of the engine is in an activated state or an inactivated state according to the acquired running parameter values of the engine.
102. Judging whether the in-cylinder brake of the engine is activated or not according to the engine operation parameters, if not, executing a step 103, and if so, executing a step 104;
and the electronic engine control unit judges whether the in-cylinder brake of the engine is activated or not by judging the acquired plurality of engine operation parameter values. If the in-cylinder braking of the engine is not activated, step 103 is executed to enable the electronic control unit to normally control the engine throttle and the EGR valve. If the in-cylinder brake of the engine is activated, then step 104 and step 105 are executed to realize the adjustment of the in-cylinder brake power and realize that the in-cylinder brake power meets the technical index requirement.
103. Controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
when the electronic control unit determines that in-cylinder engine braking is not active, then the throttle and EGR valves of the engine are controlled using a conventional opening strategy. It should be noted that the conventional opening strategy actually means that the electronic control unit does not intervene in the normal control of the throttle valve and the EGR valve in the engine, so that the engine operates according to the conventional opening characteristic curve.
104. Calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
the method is characterized in that the air inflow in a cylinder is adjusted by adjusting the opening degree of an engine throttle valve and/or an EGR valve, so that the aim of adjusting the braking power in the cylinder to enable the braking power to meet the technical index requirement is fulfilled. During the braking process of the engine, the power required for compressing air in the cylinder completely comes from the kinetic energy or potential energy of a running vehicle and a rotating crankshaft, the larger the air intake quantity is, the larger the air quantity in the cylinder is, the compression resistance is increased, the corresponding brake power in the cylinder is also larger, and otherwise, the brake power is smaller.
Specifically, the electronic control unit may close the throttle valve as required to adjust the in-cylinder intake air amount, and/or open the EGR valve as required to adjust the in-cylinder exhaust air amount to adjust the in-cylinder compressed air amount, thereby adjusting the in-cylinder braking power. When the braking power exceeds the specification, for example, the electronic control unit may then reduce the braking power by reducing the in-cylinder compressed air amount by reducing the throttle opening (closing the throttle to reduce the intake air amount) and increasing the EGR valve opening (opening the EGR valve to increase the exhaust gas amount); when the brake power does not satisfy the specification, the brake power can be increased by increasing the amount of in-cylinder compressed air by increasing the throttle opening (opening the throttle to increase the intake air amount) and by decreasing the EGR valve opening (closing the EGR valve to decrease the exhaust gas amount).
The opening degree of a throttle valve and the opening degree of an EGR valve can be calibrated according to different working conditions of an engine and combined with the technical index requirement of the braking power of the engine during bench test of the engine, so that an electronic control unit can directly use the calibrated opening degree value to control the opening degree of the throttle valve and the EGR valve in the running process of the engine, namely the target opening degree strategy in the application. Further, as the atmospheric pressure in the plateau area is reduced and the air density is reduced compared with that in the plateau area, the amount of air entering a cylinder of the engine is small, and the braking power is likely to be greatly reduced, the closing degree of the throttle valve and the opening degree of the EGR valve can be calibrated to different values according to different rotating speeds, environmental pressures and environmental temperatures of the engine, so that the adaptability of the braking power of the engine in different environments such as the plateau area and the like is improved. Specifically, the +/-45 ℃ environment temperature can be simulated during bench test, the absolute pressure is 70-103 kPa, and the influence of plateau climate on the engine can be simulated completely.
105. And controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets the preset technical index.
After the electronic control unit determines that the in-cylinder brake of the engine is activated, a target opening degree strategy calibrated during bench test is called, the target opening degree of a throttle valve and/or an EGR valve is determined according to the current working condition (rotating speed, ambient pressure and ambient temperature) of the engine, the throttle valve and/or the EGR valve is controlled to be adjusted to the target opening degree, and the in-cylinder brake power of the adjusted engine meets the technical index requirement, so that the in-cylinder brake power is adjusted.
In the embodiment, whether the in-cylinder brake is activated or not is judged, so that when the in-cylinder brake is activated, the electronic control unit of the engine controls a throttle valve and an EGR valve of the engine according to a target opening degree strategy calibrated by a bench test, and the compressed air amount in the in-cylinder brake process is adjusted, so that the in-cylinder brake power is adjusted, and the in-cylinder brake power meets the technical index.
The target opening degree strategy is that different opening degree values are calibrated according to different rotating speeds, different environmental pressures and different environmental temperatures of the engine, so that the adaptability of the engine to braking power under different environmental conditions such as plains, plateaus and the like is improved, and the driving safety of the vehicle is ensured.
Referring to fig. 2, a method for adjusting in-cylinder brake power of an engine according to an embodiment of the present application is described in detail below, where another embodiment of the method for adjusting in-cylinder brake power of an engine according to an embodiment of the present application includes:
201. obtaining engine operating parameters;
in this embodiment, step 201 is similar to step 101 of the previous embodiment, and is not described herein again.
Specifically, the electronic control unit can judge whether the in-cylinder brake of the engine is activated or not through the rotating speed and the oil quantity of the engine and an in-cylinder brake switch.
The states of the in-cylinder brake switch of the engine comprise a set state and a reset state, wherein in the electronic control unit of the engine, the set state can be represented by 1, and the reset state can be represented by 0. If the brake switch state is the set state, further judgment is needed to determine whether the in-cylinder brake of the engine is activated.
202. Judging whether the in-cylinder brake of the engine is activated or not according to the engine operation parameters, if not, executing a step 103, and if so, executing a step 104;
the judgment condition of the current Bosch strategy on whether the in-cylinder brake function is activated is as follows: 1. a driver presses down an in-cylinder brake switch, and the ECU receives a signal set of the in-cylinder brake switch; 2. the current rotating speed is greater than a threshold value; 3. the current amount of oil is less than the threshold. When these three conditions are simultaneously satisfied, the ECU activates the in-cylinder braking function. Therefore, after the electronic control unit determines that the in-cylinder brake switch state is the set state, it is determined that the amount of oil circulated by the engine is smaller than the preset amount of oil, and it is determined that the rotation speed of the engine is greater than the preset rotation speed, and it is determined that the in-cylinder brake of the engine is activated, and step 104 is executed. And when any one of the three conditions is not satisfied, step 103 is executed.
203. Controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
204. calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
in this embodiment, steps 203 to 204 are similar to steps 103 to 104 of the previous embodiment, and are not repeated herein.
205. Controlling the throttle valve and/or the EGR valve to adjust to a first opening degree according to the target opening degree strategy; controlling the throttle valve and/or the EGR valve to be kept at a first opening degree when the throttle valve and/or the EGR valve are/is at the first opening degree and the in-cylinder braking power of the engine meets a preset technical index;
after the electronic control unit determines that the in-cylinder brake of the engine is activated, a target opening strategy calibrated during bench test is called, the target opening of the throttle valve and/or the EGR valve is determined according to the current working condition (rotating speed, ambient pressure and ambient temperature) of the engine, the throttle valve and/or the EGR valve is controlled to be adjusted to the target opening, and at the moment, the in-cylinder brake power of the engine meets the technical index requirement, so that the in-cylinder brake power is adjusted.
Taking the adjustment of the throttle valve as an example, the opening of the throttle valve in the initial state is 100 when the in-cylinder brake is activated, the electronic control unit determines that the target opening of the throttle valve is 50 according to the target opening strategy, and then the electronic control unit controls the opening of the throttle valve to be adjusted from 100 to 50, but in the adjusting process, when the in-cylinder brake power when the opening of the throttle valve is 70 (the first opening) meets the technical index requirement under the current working condition, the electronic control unit sets the opening 70 of the current throttle valve, and writes the program into the electronic control unit so that the electronic control unit controls the opening of the throttle valve to be kept at 70.
206. And when the throttle valve and/or the EGR valve are/is under a first opening degree and the in-cylinder braking power of the engine does not meet the preset technical index, controlling the throttle valve and/or the EGR valve to be adjusted to a second opening degree from the first opening degree, wherein the second opening degree is the opening degree calibrated by the target opening degree strategy.
During the adjustment of the throttle valve, the electronic control unit controls the throttle valve to start adjustment from an initial state opening 100, but during the adjustment, if the in-cylinder braking power does not meet the preset technical index all the time, the adjustment is continued until the in-cylinder braking power meets the preset technical index or the throttle valve opening is adjusted to a second opening (the opening calibrated by the target opening strategy), which is calibrated by a bench test, at which the in-cylinder braking power of the engine meets the preset technical index.
The method for adjusting the in-cylinder brake power of the engine in the embodiment of the present application is described above, and the system for adjusting the in-cylinder brake power of the engine in the embodiment of the present application is described as follows:
referring to fig. 3, an embodiment of a system for adjusting in-cylinder braking power of an engine according to an embodiment of the present application includes:
an acquisition unit 301 for acquiring engine operating parameters;
a judging unit 302, configured to judge whether in-cylinder braking of the engine is activated according to the engine operating parameter;
a first control unit 303 for controlling a throttle valve and an EGR valve of the engine using a normal opening degree strategy when the determination result of the determining unit 302 is no;
a calling unit 304 for calling a target opening degree strategy when the judgment result 302 of the judging unit is yes, the target opening degree strategy being associated with the rotation speed, the ambient pressure and the ambient temperature of the engine;
a second control unit 305 for controlling the throttle valve and/or the EGR valve according to the target opening strategy, the throttle valve and/or the EGR valve being calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset specification.
In the system of the embodiment, whether the in-cylinder brake is activated is determined by the obtaining unit 301 and the determining unit 302, so that when the electronic control unit of the engine activates the in-cylinder brake, the second control unit 305 controls the throttle valve and the EGR valve of the engine according to the target opening degree strategy calibrated by the bench test, thereby adjusting the compressed air amount during the in-cylinder brake, and further adjusting the in-cylinder brake power, so that the in-cylinder brake power meets the technical index.
The target opening degree strategy is that different opening degree values are calibrated according to different rotating speeds, different environmental pressures and different environmental temperatures of the engine, so that the adaptability of the engine to braking power under different environmental conditions such as plains, plateaus and the like is improved, and the driving safety of the vehicle is ensured.
Referring to fig. 4, a system for adjusting in-cylinder braking power of an engine according to an embodiment of the present application will be described in detail below, where another embodiment of the system for adjusting in-cylinder braking power of an engine according to an embodiment of the present application includes:
an acquisition unit 401 for acquiring engine operating parameters;
a judging unit 402, configured to judge whether in-cylinder braking of the engine is activated according to the engine operating parameter;
a first control unit 403 for controlling a throttle valve and an EGR valve of the engine using a normal opening degree strategy when the determination result of the determining unit 402 is no;
an invoking unit 404 configured to invoke a target opening degree strategy when the determination result of the determining unit 402 is yes, the target opening degree strategy being associated with the rotation speed, the ambient pressure, and the ambient temperature of the engine;
a second control unit 405 for controlling the throttle valve and/or the EGR valve according to the target opening strategy, the throttle valve and/or the EGR valve being calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset specification.
Optionally, the second control unit 405 is specifically configured to:
controlling the throttle valve and/or the EGR valve to adjust to a first opening degree according to the target opening degree strategy;
when the throttle valve and/or the EGR valve are/is at a first opening degree and the in-cylinder braking power of the engine satisfies a preset specification, the second control unit 405 controls the throttle valve and/or the EGR valve to be maintained at the first opening degree;
when the throttle valve and/or the EGR valve are/is at a first opening degree and the in-cylinder braking power of the engine does not meet the preset specification, the second control unit 405 controls the throttle valve and/or the EGR valve to be adjusted from the first opening degree to a second opening degree, which is the opening degree calibrated by the target opening degree strategy.
Optionally, the obtaining unit 401 is specifically configured to obtain the circulating oil amount, the rotation speed, and the in-cylinder brake switch state of the engine.
Optionally, the determining unit 402 includes:
the first judgment module 4021 is used for judging whether the in-cylinder brake switch state of the engine is a set state;
the second judging module 4022 is configured to judge whether the amount of circulating oil of the engine is less than a preset amount of oil when the first judging module 4021 determines that the in-cylinder brake switch state is the set state;
a third determining module 4023, configured to determine whether the rotational speed of the engine is greater than a preset rotational speed when the second determining module 4022 determines that the amount of the circulating oil of the engine is less than a preset oil amount;
a determination module 4024, configured to determine that in-cylinder braking of the engine is activated when the third determination module 4023 determines that the rotation speed of the engine is greater than a preset rotation speed.
In this embodiment, the functions of each unit and each module correspond to the steps in the embodiment shown in fig. 2, and are not described herein again.
Referring to fig. 5, fig. 5 is a diagram illustrating an embodiment of the apparatus for adjusting in-cylinder braking power of an engine according to the present invention, the apparatus includes:
a processor 501, a memory 502, an input/output unit 505, a bus 504;
the processor 501 is connected with the memory 502, the input/output unit 505 and the bus 504;
the memory 502 holds a program that the processor 501 invokes to perform any of the methods for adjusting engine in-cylinder braking power as described above.
The present application also relates to a computer readable storage medium having a program stored thereon, which when run on a computer causes the computer to perform a method of adjusting in-cylinder braking power of an engine as described above.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (10)
1. A method of adjusting in-cylinder braking power of an engine, comprising:
obtaining engine operating parameters;
judging whether the in-cylinder braking of the engine is activated or not according to the engine operation parameters;
if not, controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
if yes, calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
2. The method of claim 1, wherein the controlling a throttle valve of the engine and/or the EGR valve according to the target opening strategy comprises:
controlling the throttle valve and/or the EGR valve to be adjusted to a first opening degree according to the target opening degree strategy;
when the throttle valve and/or the EGR valve is/are at a first opening degree and the in-cylinder braking power of the engine meets a preset technical index, controlling the throttle valve and/or the EGR valve to be kept at the first opening degree;
and when the throttle valve and/or the EGR valve are/is under a first opening degree and the in-cylinder braking power of the engine does not meet the preset technical index, controlling the throttle valve and/or the EGR valve to be adjusted to a second opening degree from the first opening degree, wherein the second opening degree is the opening degree calibrated by the target opening degree strategy.
3. The method according to any one of claims 1 or 2, wherein the engine operating parameters include an amount of oil circulated by the engine, a rotational speed, and an in-cylinder brake switch state.
4. The method of claim 3, wherein said determining whether in-cylinder braking of an engine is activated based on said engine operating parameters comprises:
judging whether the in-cylinder brake switch state of the engine is a set state or not;
if the in-cylinder brake switch state is determined to be the set state, judging whether the circulating oil quantity of the engine is smaller than a preset oil quantity or not;
if the circulating oil quantity of the engine is smaller than the preset oil quantity, judging whether the rotating speed of the engine is larger than the preset rotating speed;
and if the rotating speed of the engine is determined to be greater than the preset rotating speed, determining that in-cylinder braking of the engine is activated.
5. A system for adjusting in-cylinder braking power of an engine, comprising:
the acquisition unit is used for acquiring engine operating parameters;
the judging unit is used for judging whether the in-cylinder brake of the engine is activated or not according to the engine operation parameters;
the first control unit is used for controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy when the judgment result of the judgment unit is negative;
the calling unit is used for calling a target opening strategy when the judgment result of the judgment unit is yes, and the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and the second control unit is used for controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, and the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
6. The system of claim 5, wherein the second control unit is specifically configured to:
controlling the throttle valve and/or the EGR valve to be adjusted to a first opening degree according to the target opening degree strategy;
when the throttle valve and/or the EGR valve is/are at a first opening degree and the in-cylinder braking power of the engine meets a preset technical index, the second control unit controls the throttle valve and/or the EGR valve to be kept at the first opening degree;
and when the throttle valve and/or the EGR valve are/is under a first opening degree and the in-cylinder braking power of the engine does not meet the preset technical index, the second control unit controls the throttle valve and/or the EGR valve to be adjusted from the first opening degree to a second opening degree, and the second opening degree is the opening degree calibrated by the target opening degree strategy.
7. The system according to any one of claims 5 or 6, characterized in that the acquisition unit is specifically configured to acquire the amount of circulating oil, the rotational speed, and the in-cylinder brake switch state of the engine.
8. The system according to claim 7, wherein the judging unit includes:
the first judgment module is used for judging whether the in-cylinder brake switch state of the engine is a set state or not;
the second judgment module is used for judging whether the circulating oil quantity of the engine is smaller than a preset oil quantity or not when the first judgment module determines that the in-cylinder brake switch state is a set state;
the third judging module is used for judging whether the rotating speed of the engine is greater than the preset rotating speed or not when the second judging module determines that the circulating oil quantity of the engine is less than the preset oil quantity;
and the determining module is used for determining that in-cylinder braking of the engine is activated when the third judging module determines that the rotating speed of the engine is greater than the preset rotating speed.
9. An apparatus for adjusting braking power in an engine cylinder, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the processor specifically performs the following operations:
obtaining engine operating parameters;
judging whether the in-cylinder braking of the engine is activated or not according to the engine operation parameters;
if not, controlling a throttle valve and an EGR valve of the engine by adopting a conventional opening strategy;
if yes, calling a target opening strategy, wherein the target opening strategy is related to the rotating speed, the ambient pressure and the ambient temperature of the engine;
and controlling the throttle valve and/or the EGR valve according to the target opening degree strategy, wherein the throttle valve and/or the EGR valve are calibrated by the engine bench test so that the in-cylinder braking power of the engine meets a preset technical index.
10. A computer storage readable storage medium having a program stored thereon, which when executed on a computer performs the method of any one of claims 1 to 4.
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| CN202110239477.5A CN113047966B (en) | 2021-03-04 | 2021-03-04 | Method and system for adjusting braking power in engine cylinder and related device |
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| CN202110239477.5A CN113047966B (en) | 2021-03-04 | 2021-03-04 | Method and system for adjusting braking power in engine cylinder and related device |
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