CN114013422B - Auxiliary braking system and method of vehicle-mounted engine and vehicle - Google Patents
Auxiliary braking system and method of vehicle-mounted engine and vehicle Download PDFInfo
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- CN114013422B CN114013422B CN202111278972.3A CN202111278972A CN114013422B CN 114013422 B CN114013422 B CN 114013422B CN 202111278972 A CN202111278972 A CN 202111278972A CN 114013422 B CN114013422 B CN 114013422B
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
- B60W10/198—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with exhaust brakes
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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
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
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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
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18136—Engine braking
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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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
Abstract
The application discloses an auxiliary braking system and method of a vehicle-mounted engine and a vehicle, and relates to the technical field of vehicle engine braking, wherein the auxiliary braking system comprises a constant speed gear switch, a vehicle control unit VECU and an engine control unit EECU; the constant speed gear switch is used for sending out a constant speed gear switch signal; the vehicle controller VECU is used for determining corresponding braking requirements according to a vehicle speed signal of current downhill running after receiving the constant speed gear switch signal, wherein the braking requirements are the ratio of braking power to calibration power; the engine control unit EECU is adapted to controlling both engine braking and exhaust braking in accordance with a determined braking demand. According to the method and the device, the only corresponding braking requirement is determined according to the vehicle speed of downhill running, engine braking and exhaust braking are correspondingly and automatically controlled according to the braking requirement to keep the vehicle speed, frequent gear shifting operation of a driver is not needed, the braking requirement is the ratio of braking power to calibration power, and the method and the device are applicable to vehicles with different calibration powers.
Description
Technical Field
The application relates to the technical field of vehicle braking control, in particular to an auxiliary braking system and method of a vehicle-mounted engine and a vehicle.
Background
During downhill travel of the vehicle, the driver needs to frequently depress the brake pedal in order to maintain the vehicle speed, resulting in increased friction times of the brake shoe drum and wear. If the abrasion of the brake drums of the brake shoes is serious, the probability of braking failure of a vehicle braking system is easily improved, and more traffic accidents are caused. Therefore, auxiliary braking is often required for vehicles on downhill to ensure safe downhill.
In the auxiliary braking technology of a vehicle engine, the auxiliary braking technology mainly comprises engine braking and exhaust braking, and the current engine braking and the exhaust braking only have fixed auxiliary braking gears, such as the engine braking is generally divided into two stages, and the exhaust braking is generally only one stage.
Specifically, the exhaust brake valve is driven by the electromagnetic valve to control the exhaust pressure to change the braking power, and the exhaust brake valve is only in an on state and an off state, so that the air pressure on the exhaust brake valve is only in a state of no air pressure and a maximum air pressure, and even some engines do not have the exhaust brake valve.
The two-stage engine braking is realized by controlling the engine to enter and exhaust through the electromagnetic valve driving rocker arm, and three cylinders and six cylinders are operated, so that in the driving process on a road, the gear of the gearbox and the gear of the engine braking are required to be changed frequently, and the driving braking is required to be matched simultaneously when the gear is required, so that a driver is required to have higher driving experience, and the gear is shifted back and forth and the driving braking is matched, the labor intensity of the driver is increased, and the driver is easy to feel driving fatigue.
Disclosure of Invention
The embodiment of the application provides an auxiliary braking system and method of a vehicle-mounted engine and a vehicle, and aims to solve the technical problem that a driver needs to frequently shift gears in a downhill braking process in the related art.
In a first aspect, an auxiliary braking system of a vehicle-mounted engine is provided, which comprises a constant speed gear switch, a vehicle controller VECU and an engine control unit EECU;
the constant speed gear switch is used for sending out a constant speed gear switch signal;
the vehicle controller VECU is used for determining corresponding braking requirements according to a vehicle speed signal of current downhill running after receiving the constant speed gear switch signal, wherein the braking requirements are the ratio of braking power to calibration power;
the engine control unit EECU is adapted to controlling both the engine brake and the exhaust brake in accordance with the determined braking demand such that the vehicle speed is maintained.
In some embodiments, a proportional solenoid valve and an exhaust brake valve are also included; the engine control unit EECU is specifically used for controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand; meanwhile, a corresponding duty ratio is calculated according to the braking demand, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
In some embodiments, the constant speed gear switch is connected to the vehicle controller VECU through a wire, and the vehicle controller VECU is connected to the engine control unit EECU through a CAN bus.
In a second aspect, there is also provided an auxiliary braking method for a vehicle-mounted engine, including the steps of:
after receiving a constant speed gear switch signal, determining a corresponding braking demand according to a current downhill running vehicle speed signal, wherein the braking demand is the ratio of braking power to calibration power;
according to the determined braking demand, engine braking and exhaust braking are simultaneously controlled so that the vehicle speed is maintained.
In some embodiments, the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand comprises:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
In some embodiments, the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand further comprises:
and controlling the opening degree of the EGR valve according to the determined braking demand.
In some embodiments, the ratio is divided into a first state, a second state, a third state, a fourth state and a fifth state according to 0 to 100%,
if the braking demand corresponds to the first state, controlling a cylinder of the engine to be not operated, and controlling an exhaust brake valve to be closed;
if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve;
if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
and if the fifth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, controlling the exhaust brake valve to be fully opened, and controlling the opening degree of the EGR valve.
In some embodiments, the ratio corresponding to the first state is zero, the ratio corresponding to the second state is in the range of 0-40%, the ratio corresponding to the third state is in the range of 40-65%, the ratio corresponding to the fourth state is in the range of 65-90%, and the ratio corresponding to the fifth state is in the range of 90-100%.
In some embodiments, the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand comprises:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening of the VGT valve is controlled based on the duty ratio.
In a second aspect, there is also provided a vehicle, wherein the gear comprises a first gear and a second gear, and further comprises a constant speed gear, and the function of the constant speed gear is realized by the steps of the auxiliary braking method of the vehicle-mounted engine.
The beneficial effects that technical scheme that this application provided brought include: the braking system of the vehicle engine is improved, the only corresponding braking requirement is determined according to the vehicle speed of downhill running, the engine braking and the exhaust braking are correspondingly and automatically controlled according to the braking requirement to keep the vehicle speed, frequent gear shifting operation of a driver is not needed, the braking requirement is the ratio of braking power to calibration power, and the system is applicable to vehicles with different calibration powers.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first structural block diagram of an auxiliary braking system of a vehicle-mounted engine according to an embodiment of the present application;
FIG. 2 is a second block diagram of an auxiliary braking system for a vehicle engine according to an embodiment of the present disclosure;
FIG. 3 is a block flow diagram of an auxiliary braking method for a vehicle engine according to an embodiment of the present disclosure;
fig. 4 is a specific flow chart of an auxiliary braking method of a vehicle-mounted engine according to an embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
The embodiment of the application provides an auxiliary braking system of a vehicle-mounted engine, which is used for improving the braking system of the vehicle engine, determining a unique corresponding braking demand according to the vehicle speed of downhill running, and correspondingly and automatically controlling engine braking and exhaust braking according to the braking demand to keep the vehicle speed without frequent gear shifting operation of a driver, wherein the braking demand is the ratio of braking power to calibration power, and the auxiliary braking system is applicable to vehicles with different calibration powers.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, an embodiment of the present application provides an auxiliary brake system of a vehicle engine, including a constant speed gear switch, a vehicle controller VECU, and an engine control unit EECU;
the constant speed gear switch is used for sending out a constant speed gear switch signal;
the vehicle controller VECU is used for determining corresponding braking requirements according to a vehicle speed signal of current downhill running after receiving the constant speed gear switch signal, wherein the braking requirements are the ratio of braking power to calibration power;
the engine control unit EECU is adapted to controlling both engine braking and exhaust braking in accordance with a determined braking demand such that the vehicle speed is maintained.
In the downhill process of the vehicle, a driver starts a constant speed gear, namely a constant speed gear switch is turned on, the constant speed gear switch generates a constant speed gear switch signal and sends the constant speed gear switch signal to the vehicle control unit VECU, the vehicle control unit VECU determines corresponding braking requirements according to a current downhill traveling vehicle speed signal after receiving the constant speed gear switch signal and sends the corresponding braking requirements to the engine control unit EECU, and the engine control unit EECU simultaneously controls engine braking and exhaust braking according to the determined braking requirements, so that the vehicle speed is kept. Therefore, the vehicle can keep the vehicle speed by starting the constant speed gear in the downhill process of the vehicle, the driver is not required to shift gears reciprocally, the labor intensity of the driver is lightened, the experience of the driver is improved, and the requirement on the operation level of the driver is also reduced.
It is noted that the braking demand is a ratio of braking power, which is the power required to maintain the vehicle speed, to a calibrated power, which is the maximum braking power calibrated in advance.
Further, the device also comprises a proportional electromagnetic valve and an exhaust brake valve; the engine control unit EECU is specifically used for controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand; meanwhile, a corresponding duty ratio is calculated according to the braking demand, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
As shown in fig. 1, in this embodiment, the constant speed gear switch is connected to the vehicle controller VECU, which is connected to the engine control unit EECU, which is connected to the exhaust brake valve through a proportional solenoid valve, and which is also connected to the rocker arm through a solenoid valve.
The driver opens the constant speed gear switch, the constant speed gear switch produces a constant speed gear switch signal and sends the constant speed gear switch signal to the whole vehicle controller VECU, the whole vehicle controller VECU determines corresponding braking demands according to the current downhill driving speed signal after receiving the constant speed gear switch signal and sends the corresponding braking demands to the engine control unit EECU, the engine control unit EECU outputs corresponding duty ratio to the proportional solenoid valve to adjust the opening of the exhaust brake valve on the opening of 0-100%, different openings on the exhaust brake valve correspond to different air pressures, in the process that the exhaust brake valve is gradually opened, the exhaust brake back pressure is gradually increased, corresponding braking power is gradually increased, and further exhaust brake is realized, meanwhile, the determined braking demands are also controlled by the solenoid valve to enable corresponding cylinders to operate, and further engine brake is realized.
If the proportional solenoid valve and the exhaust brake valve are integrally replaced with VGT valves, exhaust brake can be realized.
As shown, an EGR valve is also included, which is connected to the engine control unit EECU.
The ratio is in the range of 0-100%, the ratio of 0-100% is sequentially divided into a first state, a second state, a third state, a fourth state and a fifth state according to the sequence of small sizes, and if the braking requirement corresponds to the first state, the cylinder of the engine is controlled not to operate, and the exhaust brake valve is controlled to be closed; if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve; if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fifth state corresponding to the braking requirement is that the six cylinders of the transmitter are controlled to run, the exhaust brake valve is controlled to be fully opened, the opening of the EGR valve is also controlled, different braking requirements correspond to different opening of the EGR valve, and in the process of controlling the exhaust brake valve, different braking requirements correspond to different opening of the exhaust valve from 0% to 100%, and the stepless regulation of the required braking power from zero to the calibrated power can be realized by adopting the control mode in the embodiment.
Specifically, as shown in table 1, it is a table of braking demand versus engine braking and exhaust braking. The braking requirement corresponding to the first state, namely the ratio is zero, the ratio range corresponding to the second state is 0-40%, the ratio range corresponding to the third state is 40-65%, the ratio range corresponding to the fourth state is 65-90%, and the ratio range corresponding to the fifth state is 90-100%.
TABLE 1
Specifically, the constant speed gear switch is connected with the vehicle control unit VECU through a wire, and the vehicle control unit VECU is connected with the engine control unit EECU through a CAN bus.
In this embodiment, the vehicle controller VECU receives a constant speed gear switch signal through an electric wire, receives a vehicle speed signal through a CAN bus, the vehicle speed signal is collected by an instrument component, the vehicle speed is faster and faster when the vehicle descends, the vehicle speed is increased, the required braking power is also increased, the calibration power of the vehicle is fixed, the braking power is increased, the ratio of the braking power to the calibration power is also increased, the ratio is defined as the braking requirement, the vehicle controller VECU CAN determine the unique braking requirement according to the vehicle speed signal, the braking requirement is sent to the engine control unit EECU through the CAN bus, the greater the vehicle speed is, the greater the braking requirement is, the engine control unit EECU is used for stepless adjusting exhaust braking according to the braking requirement, and engine braking of different levels is assisted, so that the vehicle speed stability when the vehicle descends CAN be substantially maintained.
As shown in fig. 3, the embodiment of the application further provides an auxiliary braking method of the vehicle-mounted engine, which includes the following steps:
s1: after receiving a constant speed gear switch signal, determining a corresponding braking demand according to a current downhill running vehicle speed signal, wherein the braking demand is the ratio of braking power to calibration power;
s2: according to the determined braking demand, engine braking and exhaust braking are simultaneously controlled so that the vehicle speed is maintained.
In the downhill process of the vehicle, a driver starts a constant speed gear, namely a constant speed gear switch is turned on, the constant speed gear switch generates a constant speed gear switch signal and sends the constant speed gear switch signal to the vehicle control unit VECU, the vehicle control unit VECU determines corresponding braking requirements according to a current downhill traveling vehicle speed signal after receiving the constant speed gear switch signal and sends the corresponding braking requirements to the engine control unit EECU, and the engine control unit EECU simultaneously controls engine braking and exhaust braking according to the determined braking requirements, so that the vehicle speed is kept. Therefore, the vehicle can keep the vehicle speed by starting the constant speed gear in the downhill process of the vehicle, the driver is not required to shift gears reciprocally, the labor intensity of the driver is lightened, the experience of the driver is improved, and the requirement on the operation level of the driver is also reduced.
It is noted that the braking demand is a ratio of braking power, which is the power required to maintain the vehicle speed, to a calibrated power, which is the maximum braking power calibrated in advance.
Further, as shown in fig. 4, the specific steps of simultaneously controlling the engine brake and the exhaust brake according to the determined braking demand include:
s21, controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
s22: and according to the braking demand, calculating a corresponding duty ratio, and controlling the opening of the exhaust brake valve through a proportional electromagnetic valve based on the duty ratio.
In this embodiment, the engine control unit EECU controls the operation of a corresponding number of cylinders of the engine according to the determined braking requirement; meanwhile, a corresponding duty ratio is calculated according to the braking demand, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
Specifically, the constant speed gear switch is connected with the whole vehicle controller VECU, the whole vehicle controller VECU is connected with the engine control unit EECU, the engine control unit EECU is connected with the exhaust brake valve through a proportional electromagnetic valve, and the engine control unit is also connected with the rocker arm through an electromagnetic valve.
The driver opens the constant speed gear switch, the constant speed gear switch produces a constant speed gear switch signal and sends the constant speed gear switch signal to the whole vehicle controller VECU, the whole vehicle controller VECU determines corresponding braking demands according to the current downhill driving speed signal after receiving the constant speed gear switch signal and sends the corresponding braking demands to the engine control unit EECU, the engine control unit EECU outputs corresponding duty ratio to the proportional solenoid valve to adjust the opening of the exhaust brake valve on the opening of 0-100%, different openings on the exhaust brake valve correspond to different air pressures, in the process that the exhaust brake valve is gradually opened, the exhaust brake back pressure is gradually increased, corresponding braking power is gradually increased, and further exhaust brake is realized, meanwhile, the determined braking demands are also controlled by the solenoid valve to enable corresponding cylinders to operate, and further engine brake is realized.
If the proportional solenoid valve and the exhaust brake valve are integrally replaced with VGT valves, exhaust brake can be realized. The specific steps of step S2 include:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening of the VGT valve is controlled based on the duty ratio.
In order to better ensure the braking force of the exhaust brake, the specific steps of simultaneously controlling the engine brake and the exhaust brake according to the determined braking requirement further comprise:
and controlling the opening degree of the EGR valve according to the determined braking demand.
In this embodiment, the EGR valve is connected to the engine control unit EECU, which controls the opening of the EGR valve according to the determined braking demand.
Preferably, the ratio is divided into a first state, a second state, a third state, a fourth state and a fifth state according to 0 to 100%,
if the braking demand corresponds to the first state, controlling a cylinder of the engine to be not operated, and controlling an exhaust brake valve to be closed;
if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve;
if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
and if the fifth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, controlling the exhaust brake valve to be fully opened, and controlling the opening degree of the EGR valve.
Specifically, the ratio corresponding to the first state is zero, the ratio corresponding to the second state is in the range of 0-40%, the ratio corresponding to the third state is in the range of 40-65%, the ratio corresponding to the fourth state is in the range of 65-90%, and the ratio corresponding to the fifth state is in the range of 90-100%.
In this embodiment, the ratio is in the range of 0-100%, where the ratio of 0-100% is sequentially divided into a first state, a second state, a third state, a fourth state and a fifth state according to the order of small sizes, and if the braking requirement corresponds to the first state, the cylinder of the engine is controlled to be not operated, and the exhaust brake valve is controlled to be closed; if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve; if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fifth state corresponding to the braking requirement is that the six cylinders of the transmitter are controlled to run, the exhaust brake valve is controlled to be fully opened, the opening of the EGR valve is also controlled, different braking requirements correspond to different opening of the EGR valve, and in the process of controlling the exhaust brake valve, different braking requirements correspond to different opening of the exhaust valve from 0% to 100%, and the stepless regulation of the required braking power from zero to the calibrated power can be realized by adopting the control mode in the embodiment.
Specifically, as shown in table 1, it is a table of braking demand versus engine braking and exhaust braking. The braking requirement corresponding to the first state, namely the ratio is zero, the ratio range corresponding to the second state is 0-40%, the ratio range corresponding to the third state is 40-65%, the ratio range corresponding to the fourth state is 65-90%, and the ratio range corresponding to the fifth state is 90-100%.
TABLE 1
Specifically, the constant speed gear switch is connected with the vehicle control unit VECU through a wire, and the vehicle control unit VECU is connected with the engine control unit EECU through a CAN bus.
In this embodiment, the vehicle controller VECU receives a constant speed gear switch signal through an electric wire, receives a vehicle speed signal through a CAN bus, the vehicle speed signal is collected by an instrument component, the vehicle speed is faster and faster when the vehicle descends, the vehicle speed is increased, the required braking power is also increased, the calibration power of the vehicle is fixed, the braking power is increased, the ratio of the braking power to the calibration power is also increased, the ratio is defined as the braking requirement, the vehicle controller VECU CAN determine the unique braking requirement according to the vehicle speed signal, the braking requirement is sent to the engine control unit EECU through the CAN bus, the greater the vehicle speed is, the greater the braking requirement is, the engine control unit EECU is used for stepless adjusting exhaust braking according to the braking requirement, and engine braking of different levels is assisted, so that the vehicle speed stability when the vehicle descends CAN be substantially maintained.
The embodiment of the application also provides a vehicle, wherein the gear comprises a first gear and a second gear, and the vehicle further comprises a constant-speed gear, and the function of the constant-speed gear is realized by the steps of the auxiliary braking method of the vehicle-mounted engine.
As shown in fig. 3, the auxiliary braking method of the vehicle-mounted engine comprises the following steps:
s1: after receiving a constant speed gear switch signal, determining a corresponding braking demand according to a current downhill running vehicle speed signal, wherein the braking demand is the ratio of braking power to calibration power;
s2: according to the determined braking demand, engine braking and exhaust braking are simultaneously controlled so that the vehicle speed is maintained.
In the downhill process of the vehicle, a driver starts a constant speed gear, namely a constant speed gear switch is turned on, the constant speed gear switch generates a constant speed gear switch signal and sends the constant speed gear switch signal to the vehicle control unit VECU, the vehicle control unit VECU determines corresponding braking requirements according to a current downhill traveling vehicle speed signal after receiving the constant speed gear switch signal and sends the corresponding braking requirements to the engine control unit EECU, and the engine control unit EECU simultaneously controls engine braking and exhaust braking according to the determined braking requirements, so that the vehicle speed is kept. Therefore, the vehicle can keep the vehicle speed by starting the constant speed gear in the downhill process of the vehicle, the driver is not required to shift gears reciprocally, the labor intensity of the driver is lightened, the experience of the driver is improved, and the requirement on the operation level of the driver is also reduced.
It is noted that the braking demand is a ratio of braking power, which is the power required to maintain the vehicle speed, to a calibrated power, which is the maximum braking power calibrated in advance.
Further, as shown in fig. 4, the specific steps of simultaneously controlling the engine brake and the exhaust brake according to the determined braking demand include:
s21, controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
s22: and according to the braking demand, calculating a corresponding duty ratio, and controlling the opening of the exhaust brake valve through a proportional electromagnetic valve based on the duty ratio.
In this embodiment, the engine control unit EECU controls the operation of a corresponding number of cylinders of the engine according to the determined braking requirement; meanwhile, a corresponding duty ratio is calculated according to the braking demand, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
Specifically, the constant speed gear switch is connected with the whole vehicle controller VECU, the whole vehicle controller VECU is connected with the engine control unit EECU, the engine control unit EECU is connected with the exhaust brake valve through a proportional electromagnetic valve, and the engine control unit is also connected with the rocker arm through an electromagnetic valve.
The driver opens the constant speed gear switch, the constant speed gear switch produces a constant speed gear switch signal and sends the constant speed gear switch signal to the whole vehicle controller VECU, the whole vehicle controller VECU determines corresponding braking demands according to the current downhill driving speed signal after receiving the constant speed gear switch signal and sends the corresponding braking demands to the engine control unit EECU, the engine control unit EECU outputs corresponding duty ratio to the proportional solenoid valve to adjust the opening of the exhaust brake valve on the opening of 0-100%, different openings on the exhaust brake valve correspond to different air pressures, in the process that the exhaust brake valve is gradually opened, the exhaust brake back pressure is gradually increased, corresponding braking power is gradually increased, and further exhaust brake is realized, meanwhile, the determined braking demands are also controlled by the solenoid valve to enable corresponding cylinders to operate, and further engine brake is realized.
If the proportional solenoid valve and the exhaust brake valve are integrally replaced with VGT valves, exhaust brake can be realized. The specific steps of step S2 include:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening of the VGT valve is controlled based on the duty ratio.
In order to better ensure the braking force of the exhaust brake, the specific steps of simultaneously controlling the engine brake and the exhaust brake according to the determined braking requirement further comprise:
and controlling the opening degree of the EGR valve according to the determined braking demand.
In this embodiment, the EGR valve is connected to the engine control unit EECU, which controls the opening of the EGR valve according to the determined braking demand.
In this embodiment, the ratio is in the range of 0-100%, where the ratio of 0-100% is sequentially divided into a first state, a second state, a third state, a fourth state and a fifth state according to the order of small sizes, and if the braking requirement corresponds to the first state, the cylinder of the engine is controlled to be not operated, and the exhaust brake valve is controlled to be closed; if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve; if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve; if the fifth state corresponding to the braking requirement is that the six cylinders of the transmitter are controlled to run, the exhaust brake valve is controlled to be fully opened, the opening of the EGR valve is also controlled, different braking requirements correspond to different opening of the EGR valve, and in the process of controlling the exhaust brake valve, different braking requirements correspond to different opening of the exhaust valve from 0% to 100%, and the stepless regulation of the required braking power from zero to the calibrated power can be realized by adopting the control mode in the embodiment.
Specifically, the constant speed gear switch is connected with the vehicle control unit VECU through a wire, and the vehicle control unit VECU is connected with the engine control unit EECU through a CAN bus.
In this embodiment, the vehicle controller VECU receives a constant speed gear switch signal through an electric wire, receives a vehicle speed signal through a CAN bus, the vehicle speed signal is collected by an instrument component, the vehicle speed is faster and faster when the vehicle descends, the vehicle speed is increased, the required braking power is also increased, the calibration power of the vehicle is fixed, the braking power is increased, the ratio of the braking power to the calibration power is also increased, the ratio is defined as the braking requirement, the vehicle controller VECU CAN determine the unique braking requirement according to the vehicle speed signal, the braking requirement is sent to the engine control unit EECU through the CAN bus, the greater the vehicle speed is, the greater the braking requirement is, the engine control unit EECU is used for stepless adjusting exhaust braking according to the braking requirement, and engine braking of different levels is assisted, so that the vehicle speed stability when the vehicle descends CAN be substantially maintained.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An auxiliary braking system of a vehicle-mounted engine is characterized by comprising a constant speed gear switch, a vehicle control unit VECU and an engine control unit EECU;
the constant speed gear switch is used for sending out a constant speed gear switch signal;
the vehicle controller VECU is used for determining corresponding braking requirements according to a vehicle speed signal of current downhill running after receiving the constant speed gear switch signal, wherein the braking requirements are the ratio of braking power to calibration power;
the engine control unit EECU is adapted to controlling both engine braking and exhaust braking in accordance with a determined braking demand such that the vehicle speed is maintained.
2. The auxiliary brake system of an on-board engine according to claim 1, further comprising a proportional solenoid valve and an exhaust brake valve; the engine control unit EECU is specifically used for controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand; meanwhile, a corresponding duty ratio is calculated according to the braking demand, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
3. The auxiliary brake system of an on-board engine according to claim 1, wherein the constant speed range switch is connected to the vehicle controller VECU via a wire, and the vehicle controller VECU is connected to the engine control unit EECU via a CAN bus.
4. An auxiliary braking method of a vehicle-mounted engine is characterized by comprising the following steps of:
after receiving a constant speed gear switch signal, determining a corresponding braking demand according to a current downhill running vehicle speed signal, wherein the braking demand is the ratio of braking power to calibration power;
according to the determined braking demand, engine braking and exhaust braking are simultaneously controlled so that the vehicle speed is maintained.
5. The auxiliary braking method of an on-vehicle engine according to claim 4, wherein the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand comprises:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening degree of the exhaust brake valve is controlled through the proportional electromagnetic valve based on the duty ratio.
6. The auxiliary braking method of an on-vehicle engine according to claim 5, wherein the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand further comprises:
and controlling the opening degree of the EGR valve according to the determined braking demand.
7. The auxiliary braking method of an on-vehicle engine according to claim 6, wherein the ratio is divided into a first state, a second state, a third state, a fourth state and a fifth state according to 0 to 100%,
if the braking demand corresponds to the first state, controlling a cylinder of the engine to be not operated, and controlling an exhaust brake valve to be closed;
if the braking demand corresponds to the second state, controlling the cylinder of the engine not to operate, and controlling the opening degree of the exhaust brake valve;
if the third state corresponding to the braking demand is met, controlling the three cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
if the fourth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, and controlling the opening of the exhaust brake valve;
and if the fifth state corresponding to the braking demand is met, controlling the six cylinders of the transmitter to run, controlling the exhaust brake valve to be fully opened, and controlling the opening degree of the EGR valve.
8. The auxiliary braking method of an on-vehicle engine according to claim 7, wherein the ratio corresponding to the first state is zero, the ratio corresponding to the second state is in a range of 0 to 40%, the ratio corresponding to the third state is in a range of 40 to 65%, the ratio corresponding to the fourth state is in a range of 65 to 90%, and the ratio corresponding to the fifth state is in a range of 90 to 100%.
9. The auxiliary braking method of an on-vehicle engine according to claim 4, wherein the specific step of simultaneously controlling engine braking and exhaust braking according to the determined braking demand comprises:
controlling the operation of a corresponding number of cylinders of the engine according to the determined braking demand;
meanwhile, according to the braking demand, a corresponding duty ratio is calculated, and the opening of the VGT valve is controlled based on the duty ratio.
10. A vehicle having a gear comprising a gear i and a gear ii, characterized by further comprising a constant speed gear, the function of which is achieved by the steps of the auxiliary braking method of the on-board engine according to any one of claims 4 to 9.
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