CN117565869A - Engine start-stop control method, device, equipment and storage medium - Google Patents
Engine start-stop control method, device, equipment and storage medium Download PDFInfo
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- CN117565869A CN117565869A CN202311728705.0A CN202311728705A CN117565869A CN 117565869 A CN117565869 A CN 117565869A CN 202311728705 A CN202311728705 A CN 202311728705A CN 117565869 A CN117565869 A CN 117565869A
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- 238000005096 rolling process Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 15
- 239000000446 fuel Substances 0.000 description 9
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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
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18018—Start-stop drive, e.g. in a traffic jam
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The application discloses an engine start-stop control method, an engine start-stop control device and a storage medium. After the engine is started, in order to avoid that the started engine stops running in advance due to the fact that the control requirement is not met, the air pressure requirement of the reference cylinder is accurately identified by combining the air pressure value change rate of the reference cylinder, and whether the engine is continuously operated or stopped in an adjusting mode is determined in a preset operation mode. Based on this, this application is through promoting the accuracy to the engine start before, start after, vehicle control demand judgement, confirm the engine start-stop mode that is applicable to current vehicle, realize the accurate control to the engine start-stop, avoid the engine to stop running under the condition of not meeting control demand, lead to the frequent start-stop of engine in the short time.
Description
Technical Field
The present application relates to the field of automotive control technology, and more particularly, relates to an engine start-stop control method, an engine start-stop control device, an engine start-stop control equipment and a storage medium.
Background
The gear shifting execution, clutch control, vehicle braking and the like of the traditional power system are all pneumatic execution mechanisms, an engine drives an inflating pump to inflate cylinders such as a clutch cylinder, a front axle braking cylinder, a rear axle braking cylinder and the like through a belt, and when the vehicle generates control requirements such as braking, gear shifting, clutch separation and the like, the cylinders deflate the corresponding pneumatic execution mechanisms to realize the control requirements.
In a hybrid electric vehicle system, a pure electric operation mode is provided, and at the moment, the engine stops running, so that fuel consumption is saved. However, when the automobile generates control demands, the automobile still needs to drive the air pump to pump air for the air cylinder through the engine, so that the engine can be started to drive the air pump to pump air at the moment, and the engine stops running after the air cylinder is full. However, if the control requirement cannot be met after the cylinder is fully filled, the engine needs to be restarted to pump the cylinder. The process requires frequent start and stop of the engine, and the stability and accuracy of the air pressure of the air cylinder can be influenced for a long time, so that the air pressure of the air cylinder can not be guaranteed to meet the current running condition and control requirement of the vehicle in time, the braking reliability of the vehicle is directly influenced, and the running safety of the vehicle is directly influenced.
Disclosure of Invention
In view of the above, the present application provides an engine start-stop control method, device, apparatus and storage medium, which are used for solving the problem of frequent start-stop of the existing engine.
In order to achieve the above object, the following solutions have been proposed:
an engine start-stop control method applied to a controller of a power system of a hybrid electric vehicle, the engine start-stop control method comprising:
under the condition of a pure electric working mode, estimating the running resistance of the vehicle under the current running condition to obtain a load resistance value of the vehicle;
when the load resistance value is within a preset resistance value range, determining a minimum starting air pressure value corresponding to the load resistance value for triggering engine starting, and acquiring a minimum air pressure value in air pressure values of a plurality of reference air cylinders in the vehicle, and an air pressure value change rate of each reference air cylinder, wherein the preset resistance value range is an interval range determined by a first load resistance value and a second load resistance value, the first load resistance value is the minimum load resistance value of the vehicle under a large-resistance running condition, and the second load resistance value is the maximum load resistance value of the vehicle under a small-resistance running condition;
When the minimum air pressure value of the air pressure values of the reference air cylinders is smaller than the minimum starting air pressure value, starting the engine, and controlling the engine to run at a preset rotating speed;
determining an operating state of the engine in a preset operating mode according to the relation between the air pressure value change rate of each reference cylinder and a preset threshold condition, wherein the operating state comprises the following steps: continuous operation and stop operation.
Optionally, the determining the running state of the engine in the preset running mode according to the relation between the air pressure value change rate of each reference air cylinder and the preset threshold condition includes:
judging whether the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition or not;
controlling the engine to operate at the preset rotating speed under the condition that the change rate of the air pressure value of each reference cylinder meets the preset threshold condition, and stopping the operation of the engine when the operation data of each reference cylinder or the engine is monitored to meet the preset condition;
and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
Optionally, the method further comprises:
and when the load resistance value is not in the preset resistance value range, starting the engine, and controlling the engine to continuously run at the preset rotating speed.
Optionally, the method further comprises:
acquiring the change rate of the air pressure value of each reference air cylinder in the vehicle;
and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
Optionally, the controlling the engine to operate at the preset rotation speed when the air pressure value change rate of each reference cylinder meets the preset threshold condition, and stopping the operation of the engine when the operation data of each reference cylinder or the engine is monitored to meet the preset condition, includes:
when the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition, controlling the engine to run at the preset rotating speed, and starting to time the running time of the engine;
Stopping the operation of the engine until the operation time of the engine obtained by timing reaches a preset time threshold.
Optionally, the controlling the engine to operate at the preset rotation speed when the air pressure value change rate of each reference cylinder meets the preset threshold condition, and stopping the operation of the engine when the operation data of each reference cylinder or the engine is monitored to meet the preset condition, includes:
controlling the engine to run at the preset rotating speed under the condition that the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition;
acquiring an actual air pressure value and an actual air pressure value change rate of each reference air cylinder in real time;
stopping the operation of the engine when the actual air pressure value of each reference air cylinder is larger than a preset air pressure set value;
or alternatively, the first and second heat exchangers may be,
and stopping the operation of the engine when the actual air pressure value change rate of each reference cylinder exceeds a preset threshold value.
Optionally, the estimating the running resistance of the vehicle under the current running condition to obtain the load resistance value of the vehicle includes:
Acquiring driving data of a vehicle under the current driving condition, wherein the driving data at least comprises: vehicle mass, vehicle travel speed, and vehicle frontal area;
estimating the resistance of the driving data based on a preset algorithm, and determining the ramp resistance, the friction rolling resistance and the air resistance of the vehicle in the current driving process;
and determining the sum of the ramp resistance, the frictional rolling resistance and the air resistance as the current load resistance of the vehicle.
An engine start-stop control device applied to a controller of a power system of a hybrid electric vehicle, the engine start-stop control device comprising:
the resistance estimation unit is used for estimating the running resistance of the vehicle under the current running condition under the condition of being in a pure electric working mode to obtain a load resistance value of the vehicle;
an air pressure information acquisition unit configured to determine a minimum starting air pressure value that triggers an engine start corresponding to the load resistance when the load resistance value is within a preset resistance value range, and acquire a minimum air pressure value among air pressure values of a plurality of reference cylinders in the vehicle, and an air pressure value change rate of each of the reference cylinders, the preset resistance value range being an interval range determined by a first load resistance value and a second load resistance value, wherein the first load resistance value is a load resistance value of the vehicle under an uphill and heavy-load running condition, and the second load resistance value is a load resistance value of the vehicle under a downhill running condition;
An engine starting unit for starting the engine and controlling the engine to operate at a preset rotational speed when a minimum air pressure value among the air pressure values of the plurality of reference cylinders is smaller than the minimum starting air pressure value;
an operation state determining unit configured to determine an operation state of the engine in a preset operation mode according to a relationship between the air pressure value change rate of each of the reference cylinders and a preset threshold condition, the operation state including: continuous operation and stop operation.
An engine start-stop control device includes a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program to implement each step of the engine start-stop control method according to any one of the above.
A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the engine start-stop control methods.
Considering the control requirement in the running process of the vehicle, the control requirement is related to the running condition of the vehicle and the air pressure value of the air cylinder, and the control requirement can firstly determine the moment of starting the engine through the comparison result between the load resistance value and the load resistance value under the preset running condition. After the engine is started, in order to avoid that the started engine stops running in advance due to the fact that the control requirement is not met, the air pressure requirement of the reference cylinder is accurately identified by combining the air pressure value change rate of the reference cylinder, and whether the engine is continuously running or stopped in an adjusting mode is determined in a preset running mode.
According to the method and the device, the accuracy of judging the control requirements of the vehicle is improved before and after the engine is started, the engine start-stop mode suitable for the current vehicle is determined, the accurate control of the engine start-stop is realized, the engine is prevented from stopping running under the condition that the control requirements are not met, and the engine is frequently started and stopped in a short time.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic flow chart of an alternative method for implementing engine start-stop control according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an alternative engine start-stop control device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an alternative engine start-stop control device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. 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 disclosure.
The gear shifting execution, clutch control, vehicle braking and the like of the traditional power system are all pneumatic execution mechanisms, an engine drives an inflating pump to inflate cylinders such as a clutch cylinder, a front axle braking cylinder, a rear axle braking cylinder and the like through a belt, and when the vehicle generates control requirements such as braking, gear shifting, clutch separation and the like, the cylinders deflate the corresponding pneumatic execution mechanisms to realize the control requirements.
In the current control of a power system (hereinafter referred to as a hybrid system) of a hybrid electric vehicle, an electric inflating pump is generally adopted, and the starting and stopping control of an engine is not required in the inflating process. However, because the electric technology is comprehensive industrialization, an electric inflating pump is not installed in a part of the hybrid system of the hybrid vehicle, and the air cylinder is inflated by driving the inflating pump through the engine.
The vehicle control modes of the hybrid system may include: the vehicle control system comprises an electric-only control mode, an engine control mode and a hybrid control mode, wherein the vehicle driven by the motor alone is called the electric-only control mode, the vehicle driven by the engine alone is called the engine control mode, and the vehicle driven by the motor and the engine together is called the hybrid control mode. It will be appreciated that in the electric-only control mode, such as when there is no electric pump, the engine in the hybrid system needs to be started to drive the pump.
However, in the pure electric control mode, in order to save fuel consumption, the engine is in a stop state, when the air pressure of the cylinder is detected to be too low, the engine is restarted to achieve inflation, and when the air pressure value of the cylinder reaches a certain value, the engine is stopped immediately. The air pressure of the air cylinder can directly influence the braking reliability of the vehicle, and the condition that the vehicle triggers the inflating pump to work is related to the vehicle running load, running road condition and the like such as the vehicle load, gradient and speed and the like by considering the decisive effect of the air pressure of the air cylinder on the starting and stopping of the engine at present.
If the air pressure value of the air cylinder is only considered to control the start and stop of the engine, the engine is stopped from pumping when the air pressure of the air cylinder is full or the air pressure value meets a certain value. If the air pressure value of the current air cylinder still cannot meet the control requirement of the current automobile according to the related information such as the running load of the automobile and the running road condition, the automobile can be braked unreliably, and the running safety is affected. If the engine is started again, under the condition that the engine is started and stopped as required by a control strategy, the condition that the engine is started and stopped frequently occurs, the stability and the accuracy of the air pressure of the air cylinder in the running process of the vehicle are affected, the air pressure of the air cylinder cannot be guaranteed to meet the running condition and the control requirement of the vehicle in time, the braking reliability and the running safety of the vehicle are directly affected, and the economic operation of the vehicle can be directly affected by the frequent starting and stopping of the engine and the running time of the engine.
Based on the above situation, the embodiment of the application provides an engine start-stop control method applied to a controller of a hybrid system, which is used for judging whether an engine needs to be controlled to start or not through vehicle load resistance prediction in a pure electric control mode, judging whether the engine needs to run continuously or not, and enabling cylinder air pressure to ensure running safety of a vehicle. And the judgment condition of the end of inflation is set, so that the transmitter stops running as soon as possible, and the fuel consumption is saved.
Referring to fig. 1, an optional flowchart of a method for implementing start-stop control of an engine according to an embodiment of the present application may be applied to a controller of a hybrid electric vehicle power system to control start-stop of the engine, where the flowchart may include:
step S110, under the condition of being in the pure electric control mode, estimating the running resistance of the vehicle under the current running condition to obtain the load resistance value of the vehicle.
It can be understood that the control requirements of vehicle triggering braking, gear shifting, clutch separation and the like are all related to the running condition of the vehicle, for example, the condition of insufficient driving force can occur in the process of heavy load and climbing of the vehicle, and the vehicle needs to be braked in time, namely, the piston is pushed to do linear motion by inputting pressure gas into the cylinder of the pneumatic brake, so that the friction blocks of the pneumatic brake are lowered to compress the brake wheels, and the friction force is generated to realize the braking function.
Inevitably, the vehicle has resistance such as ramp resistance, wind resistance, frictional rolling resistance and the like in the running process, and the magnitude of the resistance value can reflect the running condition of the current vehicle. Based on the above, the embodiment of the application can obtain the load resistance value of the vehicle by estimating the running resistance of the vehicle under the running condition, so as to further judge whether braking or other control demands exist or not according to the load resistance value of the vehicle, whether the engine needs to be started or not, and a start-stop control strategy of the subsequent engine.
The running resistance of the vehicle may include: the frictional rolling resistance, the air resistance, the gradient resistance and the acceleration resistance can influence the running resistance of the vehicle in different vehicle types, vehicle loads, vehicle running road conditions and the like, and in the resistance estimation process, external information such as air contact, air year, road gradient, road friction coefficient and the like is non-definite information except vehicle self-state information such as vehicle self-speed, load and the like, so that the vehicle resistance needs to be estimated, the estimation mode is not limited only in the embodiment of the application, and all the modes adopt the improvement of the resistance estimation accuracy as the selection basis of the estimation mode.
Step S120, determining whether the load resistance value is within a preset resistance value range. When the load resistance value is within the preset resistance value range, step S130 is performed.
The preset resistance value range is a section range determined by a first load resistance value and a second load resistance value, wherein the first load resistance value is a minimum load resistance value of the vehicle under a large-resistance running condition, and the second load resistance value is a maximum load resistance value of the vehicle under a small-resistance running condition.
It can be understood that the control requirements of braking, gear shifting and the like of the vehicle are related to the running condition of the vehicle, for example, the vehicle is easy to have insufficient driving force under the heavy-load and climbing high-resistance running condition, the climbing cannot be carried out, the vehicle needs to be braked in time, otherwise, the vehicle slides backwards, and the engine needs to be started in time for inflation so as to realize the timely braking, so that the vehicle can provide braking force. If the vehicle is in a small-resistance running condition of clear load and downhill, the vehicle is easy to accelerate due to the gravity component of the downhill, and the vehicle is also required to be braked in time, so that the engine is required to be started in time to pump in order to avoid the too low air pressure of the cylinder of the vehicle, and the running safety of the vehicle is ensured.
It is understood that the conditions for engine on of the vehicle may include: the cylinder air pressure is too low, or the running condition of the vehicle is in a high-resistance running condition or a low-resistance running condition, wherein the high-resistance running condition and the low-resistance running condition can be identified through the load resistance value of the vehicle.
Alternatively, the load resistance value of the vehicle in the large-resistance running condition is obtained by estimating the running resistance of the vehicle in the large-resistance running condition, and a minimum load resistance value is determined as the first load resistance value from among a plurality of load resistance values. Once it is determined that the load resistance value of the current vehicle is greater than the first load resistance value, it may be determined that the current vehicle is most likely in a heavy-resistance driving condition, and the engine needs to be immediately turned on to inflate the cylinders to meet the braking demand of the vehicle under heavy load.
The load resistance value of the vehicle in the small-resistance running condition is obtained by estimating the running resistance of the vehicle in the small-resistance running condition, and one maximum load resistance value is determined as a second load resistance value from among a plurality of load resistance values. Once it is determined that the load resistance value of the current vehicle is less than the second load resistance value, it may be determined that the current vehicle is most likely in a low-resistance driving condition, and the engine is also required to be immediately turned on to inflate the cylinders to meet the braking demand of the vehicle in the low-resistance condition.
Based on the consideration, the running resistance under different running conditions is estimated, the corresponding load resistance values under different running conditions are obtained, the load resistance values are segmented, and the engine starting strategies corresponding to the different load resistance values are determined.
The cylinder pressure is not necessarily too low under high-resistance running conditions or low-resistance running conditions, but the transmitter still needs to be started immediately for inflation. Therefore, in order to improve the timeliness of starting the engine, the embodiment of the application improves the running safety of the vehicle, and preliminarily determines whether the current vehicle needs to start the engine immediately to perform quick inflation on the cylinder through the judgment of the large-resistance running condition and the small-resistance running condition, and if the vehicle does not need to start the engine immediately to perform inflation, the vehicle further judges through the air pressure of the cylinder, and the engine is started as required.
In this embodiment of the present application, a range interval defined by the first load resistance value and the second load resistance value is taken as a preset resistance value range, and in the preset resistance value range, the running condition of the vehicle is not in a large resistance running condition or a small resistance running condition, and the engine start may be determined only by the air pressure of the cylinder, and step S130 may be executed accordingly.
Optionally, when the load resistance value is not within the preset resistance value range, starting the engine, and controlling the engine to continuously run at the preset rotation speed. If the load resistance of the vehicle is in a section larger than the first load resistance value or smaller than the second load resistance value, the vehicle can be determined to be in a running condition with large resistance and small resistance, the engine is required to be started immediately for quick inflation so as to ensure the running safety of the vehicle, and the running of the engine is stopped until the load resistance value of the vehicle is judged to be in the preset resistance range.
And step S130, determining a minimum starting air pressure value corresponding to the load resistance value for triggering engine starting, and acquiring the minimum air pressure value in air pressure values of a plurality of reference cylinders in the vehicle and the air pressure value change rate of each reference cylinder.
And step S140, when the minimum air pressure value of the air pressure values of the plurality of reference cylinders is smaller than the minimum starting air pressure value, starting the engine, and controlling the engine to run at a preset rotating speed.
It can be understood that the load resistance corresponds to the current running condition of the vehicle, and the minimum air pressure value of the air cylinder for maintaining the normal running of the vehicle is different under different running conditions. In the embodiment of the application, the air pressure values of the air cylinders which can meet the normal running of the vehicle under the running conditions corresponding to various load resistance values are counted, and the minimum air pressure value corresponding to each load resistance value is determined. It is understood that when the cylinder air pressure value corresponding to the load resistance value is smaller than the minimum air pressure value, the normal running of the vehicle under the running condition cannot be maintained, and the engine is required to be started to pump air in the cylinder, so that the minimum air pressure value corresponding to each load resistance value is determined as the minimum starting air pressure value corresponding to each load resistance value, and the engine is triggered to start.
In the embodiment of the application, after the engine is started, the engine is operated at a preset rotational speed, wherein the preset rotational speed may be the lowest rotational speed (or idle speed) at which the stable operation of the engine is maintained, or may be any rotational speed at which the stable operation of the engine is maintained. It will be appreciated that the speed of the engine is related to the pumping speed of the pumping pump, the faster the engine speed, the faster the corresponding pumping speed.
Under normal conditions, the engine keeps idling continuously, and the air pump can be driven to pump air, and under the condition that the air pressure value of the air cylinder changes rapidly, the air pump is required to be accelerated to enable the air cylinder to maintain the air pressure value to be stable rapidly, the rotating speed of the engine can be controlled to achieve rapid air pumping, and under the condition that the air pressure value of the air cylinder changes rapidly, the air pressure value of the air cylinder is maintained to be stable.
The reference cylinder is a cylinder actually participating in realizing control requirements in a power system of a vehicle, and a vehicle generally comprises a plurality of reference cylinders, such as a clutch cylinder, a front axle braking cylinder, a rear axle braking cylinder and the like. In this embodiment of the present application, the air pressure value of each reference cylinder in the vehicle needs to be monitored and obtained in real time, and for comparing the minimum starting air pressure value obtained by triggering the engine to start, it is determined whether the current vehicle needs to start the engine to pump air, and a minimum air pressure value needs to be determined from the obtained air pressure values of a plurality of reference cylinders in real time.
In addition, because the air pressure value of each reference cylinder is monitored in real time, the air pressure value change rate of each reference cylinder can be calculated according to the air pressure values at the front and rear moments, whether sudden working condition changes exist in the current vehicle or not can be further determined through the air pressure value change rate, such as air leakage of an air pipe, frequent braking and the like, the air pumping mode of the engine needs to be changed, and therefore accurate control of starting and pumping of the engine is improved.
Step S150, determining an operation state of the engine in a preset operation mode according to a relationship between the air pressure value change rate of each reference cylinder and a preset threshold condition, where the operation state includes: continuous operation and stop operation.
It will be appreciated that the operation of the engine may be stopped, typically when the cylinders are full, to reduce fuel consumption. However, in the current air pumping mode of the engine, the air pressure of the reference cylinder is rapidly reduced or the air pressure value is not increased, so that the air pumping mode of the current engine is proved to be insufficient for meeting the air pressure requirement of the reference cylinder and the air pressure of the reference cylinder cannot be increased, and therefore the running state of the engine needs to be changed to change the air pumping mode of the cylinder.
And, the reasons for the occurrence of the condition that the air pressure of the reference cylinder is rapidly reduced or the air pressure value is not increased may include: the driver can continuously send out control instructions or hardware faults of the vehicle through judging the road conditions. Based on this, in order to ensure that the air pressure of the cylinder is maintained stable under the condition that the air pressure is rapidly reduced, in the embodiment of the application, the engine can increase the engine speed, accelerate the pumping speed, continuously run and prohibit stopping. The air pressure value is continuously reduced again after the operation is stopped due to the hardware failure of the vehicle. If the reference cylinder does not have the condition that the air pressure is rapidly reduced or the air pressure value is not increased, the engine can be stopped in time when the cylinder is full or other engine stopping conditions are met, and the fuel consumption is saved.
The preset threshold condition may be a pressure value change rate threshold, and when the pressure value change rate is smaller than the pressure value change rate threshold, it may be determined that the pressure value of the current cylinder is in a rapidly decreasing state, or when the pressure value change rate is zero, it indicates that the pressure value of the current cylinder is unchanged. Therefore, the preset threshold condition may be determined according to the vehicle model and the determination result, and the embodiment of the present application is not limited herein.
In summary, in the embodiment of the present application, considering the control requirement in the running process of the vehicle, related to the running condition of the vehicle and the air pressure value of the cylinder, the timing of turning on the engine may be determined by the comparison result between the load resistance value and the load resistance value in the preset running condition. After the engine is started, in order to avoid that the started engine stops running in advance due to the fact that the control requirement is not met, the air pressure requirement of the reference cylinder is accurately identified by combining the air pressure value change rate of the reference cylinder, and whether the engine is continuously running or stopped in an adjusting mode is determined in a preset running mode.
According to the method and the device, the accuracy of judging the control requirements of the vehicle is improved before and after the engine is started, the engine start-stop mode suitable for the current vehicle is determined, the accurate control of the engine start-stop is realized, the engine is prevented from stopping running under the condition that the control requirements are not met, and the engine is frequently started and stopped in a short time.
Further, the engine start-stop control method is described in detail based on the following application examples.
It is understood that the running resistance of the vehicle during running includes various types of resistance, all types of resistance can be estimated, and the sum of resistance values estimated by all types of resistance can be used as the load resistance value of the vehicle, and several resistance values with larger running resistance of the vehicle can be selected for estimation, so as to determine the load resistance value of the vehicle.
Optionally, in an embodiment of the present application, the estimating the running resistance of the vehicle under the current running condition to obtain the load resistance value of the vehicle may include: acquiring driving data of a vehicle under the current driving condition, wherein the driving data at least comprises: vehicle mass, vehicle travel speed, and vehicle frontal area; estimating the resistance of the driving data based on a preset algorithm, and determining the ramp resistance, the friction rolling resistance and the air resistance of the vehicle in the current driving process; and determining the sum of the ramp resistance, the frictional rolling resistance and the air resistance as the current load resistance of the vehicle.
The driving data of the vehicle can be obtained through sensing equipment such as a vehicle model, a sensor and the like, and in the embodiment of the application, the preset algorithm can be used for estimating the ramp resistance, the friction rolling resistance and the air resistance. Because the coefficients for calculating the resistance, such as the rolling friction coefficient, the air density, the air viscosity, the running gradient and the like of different road conditions are different, the coefficient for estimating the resistance value needs to be estimated in advance, and various resistance values are further calculated to determine the load resistance.
In the embodiment of the application, various coefficient values for calculating the resistance under the current road conditions can be determined according to the sensor of the vehicle or the high-precision map, so that the accuracy of the load resistance value is improved. Alternatively, in the embodiment of the present application, calculating the load resistance of the vehicle may be performed according to the following formula (1).
Wherein F is res For the load resistance value, F drag For air resistance, F grad For vehicle hill resistance ρ air For air density, c ω For air viscosity, A veh V is the frontal area of the vehicle veh For the vehicle running speed, m veh Is the vehicle mass, g is the gravity coefficient, alpha is the road grade, f r Is the road friction coefficient.
As can be seen from the formula (1), the load resistance value of the vehicle is related to each resistance in the running process of the vehicle, and the load resistance can reflect the road condition of the running of the vehicle to a certain extent, and different control requirements correspond to different road conditions, and the different control requirements are different in requirement on the cylinder air pressure. Based on the above, the embodiment of the application can make a preliminary judgment as to whether to start the engine to inflate the cylinder according to the load resistance value.
If the load resistance value is in a non-preset resistance value range corresponding to a large-resistance running condition or a small-resistance running condition, the engine is required to be started immediately, and the air cylinder is continuously inflated, so that the problem that under a special running condition, the air cylinder is insufficient in air pressure, the control requirement cannot be finished, and the running safety is influenced is solved. If the current load resistance value is in the preset resistance value range, the running condition of the current vehicle is proved to be stable, the engine is not started first, and when the air pressure value of the air cylinder is detected to be smaller or the air pressure value meets the minimum starting voltage value for triggering the engine to start, the engine is started again, so that the frequency for starting the engine is reduced.
The engine is started to drive the inflating pump to inflate the air cylinder, and the operation of the engine is stopped after the air cylinder is fully inflated under the normal condition, but when the engine is fully inflated and the starting voltage of the engine is quickly reduced, the engine is required to be started for inflation; or in the process of inflating the transmitter, the air pressure of the air cylinder is reduced at a certain change rate, so that the air pressure of the air cylinder is maintained at a lower level, or the air pressure of the air cylinder is continuously reduced, and therefore, the engine is started to consume fuel, and the air pressure value of the air cylinder cannot be increased.
Based on the above situation, in the embodiment of the application, in order to avoid the situation that the engine is stopped in advance to cause frequent start and stop after being started, or the engine continuously pumps air and does not work, after the engine is started, the air pressure value change rate of the air cylinder is detected in real time, and the engine is subjected to targeted adjustment of the operation mode.
Optionally, the determining the running state of the engine in the preset running mode according to the relation between the air pressure value change rate of each reference air cylinder and the preset threshold condition includes: judging whether the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition or not; controlling the engine to operate at the preset rotating speed under the condition that the change rate of the air pressure value of each reference cylinder meets the preset threshold condition, and stopping the operation of the engine when the operation data of each reference cylinder or the engine is monitored to meet the preset condition; and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
It will be appreciated that the faster the engine speed, the faster the corresponding pumping speed, and therefore, the preset threshold condition may be determined based on the current engine speed. It is assumed that the increase rate a of the cylinder air pressure value may be determined according to running the engine at a preset rotational speed, and the current cylinder air pressure value may be determined as an increased, decreased or unchanged state according to the air pressure value change rate of the cylinder. When the change rate of the air pressure value is B and B is less than or equal to 0, the air pressure value of the air cylinder cannot be improved in the current air pumping mode of the engine; or the air pressure value of the air cylinder is increased when the air pressure value of the air cylinder is changed to be B and 0 < B < A due to the hardware problem of the vehicle, but compared with the air pumping state with the increasing rate of A, the engine needs to spend more fuel and time to fully charge the air pressure of the air cylinder or meet the requirement. Therefore, in the embodiment of the present application, the preset threshold condition may be customized according to the requirements of a vehicle developer or driver.
When the change rate of the air pressure value does not meet the preset threshold condition, the air pressure value of the air cylinder is in a state of slow growth, no change or rapid reduction, so that in order to raise the air pressure value of the air cylinder, the air pumping speed of the air cylinder needs to be increased so as to raise the growth rate of the air pressure value of the air cylinder. In this embodiment of the present application, the rotation speed of the engine may be adjusted according to a preset manner, and it may be understood that the preset manner is to increase the rotation speed of the engine, but the rotation speed increasing range may be determined according to the air pressure value change rate of the air cylinder.
And operating the engine at the increased rotating speed, increasing the inflating speed of the cylinder until the air pressure value change rate of the cylinder meets the preset threshold condition, and then recovering the rotating speed of the engine to the preset rotating speed. However, considering that the reason why the air pressure value of the air cylinder is in a state of slow growth, no change or fast decrease is uncertain, the method of the embodiment of the present application does not fundamentally solve the factor causing the problem, so that there may be a case that after the rotation speed of the engine is restored to the preset rotation speed, the air pressure value change rate of the air cylinder still cannot meet the preset threshold condition, and therefore, the engine needs to continuously run at the preset rotation speed, and when the air pressure value change rate is detected to not meet the preset threshold condition, the rotation speed of the engine is adjusted again. Based on the above, it is necessary to operate the engine continuously without stopping.
It will be appreciated that the rate of change of the air pressure value of the reference cylinder may be subject to some uncontrollable factor, so in the embodiments of the present application, it is desirable to detect the rate of change of the air pressure value of each reference cylinder in real time as long as the engine is on.
Optionally, after the load resistance value is not within the preset resistance value range, the method further includes: acquiring the change rate of the air pressure value of each reference air cylinder in the vehicle; and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
The adjustment manner of the engine speed may refer to the above description and will not be described herein again under the condition that the air pressure value change rate does not satisfy the preset threshold value.
And when the change rate of the air pressure value meets a preset threshold value condition, the engine still operates at a preset rotating speed until the air pressure value of the reference cylinder or the engine operation state meets the preset condition, and the operation of the engine is stopped, wherein the preset rotating speed can be an idle speed or any set speed.
Optionally, in the embodiment of the present application, in a case where the rate of change of the air pressure value meets a preset threshold condition, the process of stopping the operation of the engine may include: when the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition, controlling the engine to run at the preset rotating speed, and starting to time the running time of the engine; stopping the operation of the engine until the operation time of the engine obtained by timing reaches a preset time threshold.
Optionally, in the embodiment of the present application, in a case where the rate of change of the air pressure value meets a preset threshold condition, the process of stopping the operation of the engine may further include: controlling the engine to run at the preset rotating speed under the condition that the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition; acquiring an actual air pressure value and an actual air pressure value change rate of each reference air cylinder in real time; stopping the operation of the engine when the actual air pressure value of each reference air cylinder is larger than a preset air pressure set value; or stopping the operation of the engine when the actual air pressure value change rate of each reference cylinder exceeds a preset threshold value.
It is understood that the preset time threshold may be calculated by a preset air pressure value change rate corresponding to a preset rotation speed of the engine and an air pressure value when the air cylinder is full, a time required for full filling of the air cylinder at the current air pressure value at the preset air pressure value change rate, and the time required for full filling of the air cylinder is determined as the preset time threshold. Or according to the real-time obtained actual air pressure value change rate, calculating the time required for inflating the air cylinder under the current air pressure value according to the actual air pressure value change rate, and determining the time as a preset time threshold. The preset time threshold value determined by the actual air pressure value change rate can be changed in real time along with the air cylinder inflation state, and the fuel consumption of the engine can be reduced. When the time after the engine is started meets a preset time threshold, the engine can be shut down as soon as the current cylinder is full or nearly full.
In addition, whether the cylinder is fully filled or not can be judged directly from the actual air pressure value of the cylinder, or whether the air pressure value of the cylinder meets the air pressure set value corresponding to the air pressure requirement, unloading occurs, and when the actual air pressure value of the cylinder meets the conditions, the operation of the engine can be stopped.
The above engine start-stop control method will be described with reference to the following practical application examples. The engine start-stop control method is assumed to be executed in the form of a computer program on a control device of a hybrid vehicle power system, wherein the control device may be a server, a PC, a PAD, a cell phone, an ECU (Electronic ControlUnit, an electronic controller unit), a VCU (Vehicle ControlUnit, a whole vehicle controller), an MCU (Micro Controller Unit, a micro control unit), an HCU (Hybrid ControlUnit, a hybrid control system), or the like.
When the control device detects that the current vehicle is in the pure electric working mode, the running resistance of the vehicle is estimated in real time, the load resistance value of the current vehicle is determined, the load resistance value of the current vehicle is assumed to be F, and the F is compared with a preset resistance value range. Wherein the preset resistance value range is [ F1, F2], wherein the resistance value F1 can be determined by the control equipment according to the historical driving data of the vehicle under the low-resistance driving condition; similarly, the resistance value F2 may be determined by the control apparatus based on historical running data of the vehicle under the high-resistance running condition.
If F is in the range of [ F1, F2], the running condition of the current vehicle is determined to be stable and not to be a high-resistance running condition or a low-resistance running condition, so that whether the engine is started or not can be determined according to whether the minimum value of the air pressure value of the air cylinder in the vehicle can meet the requirement of the vehicle. The minimum air pressure value that can meet the vehicle control demand under the current running condition, that is, the engine start minimum value P', can be determined based on the load resistance value F.
Determining a minimum air pressure value P from a plurality of air pressure values P according to the air pressure value P of each air cylinder in the vehicle obtained in real time min When P min When the pressure value P is less than or equal to P', starting the engine and operating at idle speed until the pressure value P of each cylinder reaches the pressure value P when the cylinder is full max 。
If F is not in the range of [ F1, F2], the current vehicle is proved to be in a high-resistance running condition or a low-resistance running condition, and the engine needs to be started immediately to run continuously at idle speed or at any rotation speed.
In order to avoid the cylinder from being subjected to uncontrollable factors, the air pressure value of the cylinder does not rise and fall, and under any condition, the air pressure value change rate of each cylinder needs to be detected in real time after the engine is started. If the condition that the air pressure value of one or a plurality of air cylinders does not rise and fall is determined through the air pressure value change rate of each air cylinder, the rotating speed of the engine is increased on the basis of idling until the air pressure value change rate of each air cylinder meets the preset threshold condition. And the engine is not prevented from recovering the original rotating speed, or the cylinder air pressure value is rapidly reduced after the engine is stopped, so that the driving safety of the vehicle is affected, and the engine still continuously runs and is not stopped after the original rotating speed is recovered.
Based on the method, the starting and stopping states of the engine can be determined together according to the running condition of the vehicle and the cylinder air pressure value in the running process of the vehicle, and frequent starting caused by early stopping of the engine or delayed stopping of the engine can be avoided, so that fuel is wasted.
The following describes an engine start-stop control device provided in an embodiment of the present application, and the engine start-stop control device described below and the engine start-stop control method described above may be referred to correspondingly.
First, referring to fig. 2, an engine start-stop control device applied to a controller of a power system of a hybrid vehicle is described, and as shown in fig. 2, the engine start-stop control device may include:
a resistance estimation unit 100, configured to estimate a running resistance of a vehicle under a current running condition in a pure electric operation mode, to obtain a load resistance value of the vehicle;
an air pressure information obtaining unit 200 configured to determine a minimum starting air pressure value that triggers engine starting corresponding to the load resistance when the load resistance value is within a preset resistance value range, and obtain a minimum air pressure value among air pressure values of a plurality of reference cylinders in the vehicle, and an air pressure value change rate of each of the reference cylinders, the preset resistance value range being an interval range determined by a first load resistance value and a second load resistance value, wherein the first load resistance value is a load resistance value of the vehicle under a traveling condition of ascending and heavy load, and the second load resistance value is a load resistance value of the vehicle under a traveling condition of descending;
An engine starting unit 300 for starting the engine and controlling the engine to operate at a preset rotational speed when a minimum air pressure value among the air pressure values of the plurality of reference cylinders is less than the minimum starting air pressure value;
an operation state determining unit 400 for determining an operation state of the engine in a preset operation mode according to a relationship between the air pressure value change rate of each of the reference cylinders and a preset threshold condition, the operation state including: continuous operation and stop operation.
The control requirement in the running process of the vehicle is considered, the control requirement is related to the running condition of the vehicle and the air pressure value of the air cylinder, and the time for starting the engine can be determined through the comparison result between the load resistance value and the load resistance value under the preset running condition. After the engine is started, in order to avoid that the started engine stops running in advance due to the fact that the control requirement is not met, the air pressure requirement of the reference cylinder is accurately identified by combining the air pressure value change rate of the reference cylinder, and whether the engine is continuously running or stopped in an adjusting mode is determined in a preset running mode.
According to the method and the device, the accuracy of judging the control requirements of the vehicle is improved before and after the engine is started, the engine start-stop mode suitable for the current vehicle is determined, the accurate control of the engine start-stop is realized, the engine is prevented from stopping running under the condition that the control requirements are not met, and the engine is frequently started and stopped in a short time.
Optionally, the operation state determining unit 400 includes:
the change rate judging subunit is used for judging whether the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition;
an engine first control subunit, configured to control the engine to operate at the preset rotation speed when the air pressure value change rate of each reference cylinder meets the preset threshold condition, and stop operation of the engine when it is monitored that operation data of each reference cylinder or the engine meets the preset condition;
and the second control subunit of the engine is used for controlling the rotating speed of the engine to be adjusted according to a preset mode under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
Optionally, the method further comprises:
and the engine continuous operation unit is used for starting the engine when the load resistance value is not in the preset resistance value range and controlling the engine to continuously operate at the preset rotating speed.
Optionally, the method further comprises:
a change rate acquisition unit configured to acquire a change rate of an air pressure value of each reference cylinder in the vehicle;
and the engine control unit is used for controlling the rotating speed of the engine to be adjusted according to a preset mode under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
Optionally, the first control subunit of the engine includes:
the timing subunit is used for controlling the engine to run at the preset rotating speed and starting to time the running time of the engine when the change rate of the air pressure value of each reference air cylinder is monitored to meet the preset threshold condition;
and the engine stopping subunit is used for stopping the operation of the engine until the operation time of the engine obtained by timing reaches a preset time threshold value.
Optionally, the first control subunit of the engine includes:
an engine operation subunit, configured to control the engine to operate at the preset rotation speed when it is monitored that the air pressure value change rate of each reference cylinder meets a preset threshold condition;
The air pressure parameter acquisition subunit is used for acquiring the actual air pressure value and the actual air pressure value change rate of each reference air cylinder in real time;
an engine stop first subunit, configured to stop operation of the engine when the actual air pressure value of each reference cylinder is greater than a preset air pressure set value;
and the engine stopping second subunit is used for stopping the operation of the engine when the change rate of the actual air pressure value of each reference cylinder exceeds a preset threshold value.
Optionally, the resistance estimation unit 100 includes:
a driving data obtaining subunit, configured to obtain driving data of the vehicle under a current driving condition, where the driving data at least includes: vehicle mass, vehicle travel speed, and vehicle frontal area;
the resistance estimation subunit is used for carrying out resistance estimation on the running data based on a preset algorithm and determining the ramp resistance, the friction rolling resistance and the air resistance of the vehicle in the current running process;
and a load resistance determination subunit configured to determine a sum of the ramp resistance, the frictional rolling resistance, and the air resistance as a current load resistance of the vehicle.
The engine start-stop control device provided by the embodiment of the application can be applied to engine start-stop control equipment.
Fig. 3 shows a schematic diagram of the structure of an engine start-stop control apparatus, and referring to fig. 3, the structure of the engine start-stop control apparatus may include: at least one processor 10, at least one memory 20, at least one communication bus 30, and at least one communication interface 40.
In the embodiment of the present application, the number of the processor 10, the memory 20, the communication bus 30 and the communication interface 40 is at least one, and the processor 10, the memory 20 and the communication interface 40 complete communication with each other through the communication bus 30.
The processor 10 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention, or the like.
The memory 20 may comprise a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory) or the like, such as at least one disk memory.
The memory stores programs, and the processor can call the programs stored in the memory, wherein the programs are used for realizing various processing flows in the engine start-stop control scheme.
The embodiment of the application also provides a storage medium, which can store a program suitable for being executed by a processor, and the program is used for realizing each processing flow in the engine start-stop control scheme.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or 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.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present 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 engine start-stop control method, characterized by being applied to a controller of a power system of a hybrid electric vehicle, comprising:
under the condition of a pure electric working mode, estimating the running resistance of the vehicle under the current running condition to obtain a load resistance value of the vehicle;
when the load resistance value is within a preset resistance value range, determining a minimum starting air pressure value corresponding to the load resistance value for triggering engine starting, and acquiring a minimum air pressure value in air pressure values of a plurality of reference air cylinders in the vehicle, and an air pressure value change rate of each reference air cylinder, wherein the preset resistance value range is an interval range determined by a first load resistance value and a second load resistance value, the first load resistance value is the minimum load resistance value of the vehicle under a large-resistance running condition, and the second load resistance value is the maximum load resistance value of the vehicle under a small-resistance running condition;
when the minimum air pressure value of the air pressure values of the reference air cylinders is smaller than the minimum starting air pressure value, starting the engine, and controlling the engine to run at a preset rotating speed;
Determining an operating state of the engine in a preset operating mode according to the relation between the air pressure value change rate of each reference cylinder and a preset threshold condition, wherein the operating state comprises the following steps: continuous operation and stop operation.
2. The engine start-stop control method according to claim 1, wherein the determining the operating state of the engine in a preset operating mode based on the relationship between the air pressure value change rate of each of the reference cylinders and a preset threshold condition includes:
judging whether the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition or not;
controlling the engine to operate at the preset rotating speed under the condition that the change rate of the air pressure value of each reference cylinder meets the preset threshold condition, and stopping the operation of the engine when the operation data of each reference cylinder or the engine is monitored to meet the preset condition;
and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
3. The engine start-stop control method according to claim 1, characterized by further comprising:
and when the load resistance value is not in the preset resistance value range, starting the engine, and controlling the engine to continuously run at the preset rotating speed.
4. The engine start-stop control method according to claim 3, characterized by further comprising:
acquiring the change rate of the air pressure value of each reference air cylinder in the vehicle;
and under the condition that the air pressure value change rate which does not meet the preset threshold condition exists, controlling the rotating speed of the engine to be adjusted according to a preset mode, and controlling the engine to continuously run at the preset rotating speed until the air pressure value change rate of each reference cylinder meets the preset threshold condition.
5. The engine start-stop control method according to claim 2, characterized in that the controlling the engine to operate at the preset rotational speed in the case where the air pressure value change rate of each of the reference cylinders satisfies the preset threshold condition, and stopping the operation of the engine when it is monitored that the operation data of each of the reference cylinders or the engine satisfies the preset condition, comprises:
When the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition, controlling the engine to run at the preset rotating speed, and starting to time the running time of the engine;
stopping the operation of the engine until the operation time of the engine obtained by timing reaches a preset time threshold.
6. The engine start-stop control method according to claim 2, characterized in that the controlling the engine to operate at the preset rotational speed in the case where the air pressure value change rate of each of the reference cylinders satisfies the preset threshold condition, and stopping the operation of the engine when it is monitored that the operation data of each of the reference cylinders or the engine satisfies the preset condition, comprises:
controlling the engine to run at the preset rotating speed under the condition that the change rate of the air pressure value of each reference air cylinder meets a preset threshold value condition;
acquiring an actual air pressure value and an actual air pressure value change rate of each reference air cylinder in real time;
stopping the operation of the engine when the actual air pressure value of each reference air cylinder is larger than a preset air pressure set value;
Or alternatively, the first and second heat exchangers may be,
and stopping the operation of the engine when the actual air pressure value change rate of each reference cylinder exceeds a preset threshold value.
7. The engine start-stop control method according to claim 1, wherein the estimating of the running resistance of the vehicle under the current running condition, to obtain the load resistance value of the vehicle, includes:
acquiring driving data of a vehicle under the current driving condition, wherein the driving data at least comprises: vehicle mass, vehicle travel speed, and vehicle frontal area;
estimating the resistance of the driving data based on a preset algorithm, and determining the ramp resistance, the friction rolling resistance and the air resistance of the vehicle in the current driving process;
and determining the sum of the ramp resistance, the frictional rolling resistance and the air resistance as the current load resistance of the vehicle.
8. An engine start-stop control device, characterized by being applied to a controller of a power system of a hybrid vehicle, comprising:
the resistance estimation unit is used for estimating the running resistance of the vehicle under the current running condition under the condition of being in a pure electric working mode to obtain a load resistance value of the vehicle;
An air pressure information acquisition unit configured to determine a minimum starting air pressure value that triggers an engine start corresponding to the load resistance when the load resistance value is within a preset resistance value range, and acquire a minimum air pressure value among air pressure values of a plurality of reference cylinders in the vehicle, and an air pressure value change rate of each of the reference cylinders, the preset resistance value range being an interval range determined by a first load resistance value and a second load resistance value, wherein the first load resistance value is a load resistance value of the vehicle under an uphill and heavy-load running condition, and the second load resistance value is a load resistance value of the vehicle under a downhill running condition;
an engine starting unit for starting the engine and controlling the engine to operate at a preset rotational speed when a minimum air pressure value among the air pressure values of the plurality of reference cylinders is smaller than the minimum starting air pressure value;
an operation state determining unit configured to determine an operation state of the engine in a preset operation mode according to a relationship between the air pressure value change rate of each of the reference cylinders and a preset threshold condition, the operation state including: continuous operation and stop operation.
9. An engine start-stop control apparatus comprising a memory and a processor;
the memory is used for storing programs;
the processor is configured to execute the program to implement the respective steps of the engine start-stop control method according to any one of claims 1 to 7.
10. A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the engine start-stop control method according to any one of claims 1-7.
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| CN202311728705.0A CN117565869A (en) | 2023-12-14 | 2023-12-14 | Engine start-stop control method, device, equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311728705.0A CN117565869A (en) | 2023-12-14 | 2023-12-14 | Engine start-stop control method, device, equipment and storage medium |
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| CN202311728705.0A Pending CN117565869A (en) | 2023-12-14 | 2023-12-14 | Engine start-stop control method, device, equipment and storage medium |
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