CN109162815B - Vehicle engine control method and control system - Google Patents
Vehicle engine control method and control system Download PDFInfo
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- CN109162815B CN109162815B CN201811128194.8A CN201811128194A CN109162815B CN 109162815 B CN109162815 B CN 109162815B CN 201811128194 A CN201811128194 A CN 201811128194A CN 109162815 B CN109162815 B CN 109162815B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/606—Driving style, e.g. sporty or economic driving
Abstract
The invention relates to a vehicle engine control method and a control system, wherein the control method comprises the steps of calculating a target idle speed of an engine according to the input rotating speed of a transmission when a vehicle is in a sliding state; controlling the rotation speed of the engine according to the calculated target idle speed of the engine. The method and the system can prevent the rotating speed of the engine from being lower than or lower than the input rotating speed of the transmission to a greater extent, avoid the rotating speed crossing of the engine, further eliminate the noise and the shake caused by the rotating speed crossing and improve the driving experience.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle engine control method and a vehicle engine control system.
Background
One of the important functions that a transmission carries during vehicle running is to transmit torque, the transmission transmits torque through mechanical structures such as gears, and the current geared automatic transmissions can be classified into clutch type transmissions and torque converter type transmissions.
When the vehicle is in a sliding working condition, namely a driver looses an accelerator, the engine does not transmit power, and the vehicle keeps a forward running state by means of inertia, the rotating speed of the engine is gradually reduced, for the vehicle provided with the clutch type transmission, the rotating speed of the engine is gradually reduced to be lower than the rotating speed of an input shaft of the transmission, at the moment, an output shaft end gear of the transmission drives an input shaft end gear of the transmission to rotate, and the engine is in a reverse-supporting state; if a driver treads an accelerator to accelerate, namely pressure is applied to an accelerator pedal, the power at the engine end rises, the power at the engine end is transmitted to an input shaft of the transmission through the clutch, the rotating speed of the input shaft of the transmission rises, the gear at the input shaft end drives a gear at the output shaft end of the transmission to rotate, the power driving direction is switched, the engine is switched from a reverse support state to a forward support state, the phenomenon of rotating speed crossing occurs, and the problems of tooth surface impact noise and shaking of the transmission can occur due to the spline connection gap of the clutch, the gap of a transmission gear and the like when the rotating speed crossing occurs.
For a vehicle provided with a hydraulic torque converter type transmission, under the sliding working condition, the rotating speed of an engine is gradually reduced to be lower than the rotating speed of a turbine of the transmission, and the engine is in a reverse-support state; if the driver steps on the accelerator to accelerate, namely pressure is applied to the accelerator pedal, the engine recovers oil supply, the power at the end of the engine rises, the engine is switched from a reverse-support state to a forward-support state, and the phenomenon of 'rotating speed passing' also occurs.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a control method and a control system for an engine of a vehicle, so as to solve the problems of noise and jitter when an accelerator is stepped on to accelerate in a coasting condition.
In order to solve the above-described technical problem, a first aspect of the present invention provides a vehicle engine control method, including:
calculating a target idle speed of an engine according to an input rotation speed of a transmission when the vehicle is in a coasting state;
controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
Further, the calculating the target idle speed of the engine according to the input rotation speed of the transmission includes:
acquiring an input rotating speed of a transmission;
obtaining vehicle operating parameters;
determining a rotational speed offset value according to the vehicle operating parameter;
a target idle speed of the engine is calculated based on the input speed of the transmission and a speed offset value.
In a particular embodiment, the transmission comprises a clutch-type transmission;
correspondingly, the input rotating speed of the transmission is the rotating speed of an input shaft of the clutch type transmission;
the vehicle operating parameters include: requested torque and vehicle acceleration
The determining a rotational speed offset value based on the vehicle operating parameter comprises:
a rotational speed offset value is determined based on the requested torque and vehicle acceleration.
Further, the determining a speed offset value based on the requested torque and vehicle acceleration comprises:
judging whether the requested torque is greater than or equal to a preset first requested torque;
when the judgment result is yes, determining the rotating speed deviation value as a preset first rotating speed deviation value;
when the judgment result is negative, judging whether the vehicle acceleration is greater than or equal to a preset acceleration;
when the judgment result is yes, determining the rotating speed deviation value as a preset second rotating speed deviation value;
and when the judgment result is negative, determining the rotating speed deviation value as a preset third rotating speed deviation value.
Further, the calculating a target idle speed of the engine based on the input speed of the transmission and the speed offset value comprises:
calculating a sum of the input shaft speed of the clutch transmission and the speed offset value, and taking the sum as a target idle speed of the engine.
Further, before controlling the rotational speed of the engine according to the calculated target idle speed of the engine, the method further includes:
judging whether the target idling speed of the engine is larger than the basic idling speed of the engine; and
judging whether the requested torque is smaller than a preset second requested torque or not;
and if the result of the judgment is yes, executing the step of controlling the rotating speed of the engine according to the calculated target idling speed of the engine.
In another particular embodiment, the transmission includes a torque converter type transmission;
correspondingly, the input rotating speed of the transmission is the turbine rotating speed of the hydraulic torque converter type transmission;
the vehicle operating parameters include: vehicle travel mode and brake torque;
the determining a rotational speed offset value based on the vehicle operating parameter comprises:
and determining a rotating speed deviation value according to the vehicle running mode and the braking torque.
Further, the calculating a target idle speed of the engine based on the input speed of the transmission and the speed offset value comprises:
calculating a difference between the turbine speed and the speed offset value and using the difference as a target idle speed of the engine.
Further, the controlling the rotation speed of the engine according to the calculated target idle speed of the engine includes:
preprocessing the target idle speed of the engine to obtain a first rotating speed;
determining a second rotation speed according to the first rotation speed and the basic idle speed of the engine;
determining a third rotating speed according to the second rotating speed and the dynamic deviation rotating speed;
and controlling the rotating speed of the engine to be the third rotating speed.
Further, before calculating the target idle speed of the engine based on the input speed of the transmission, the method further comprises:
acquiring a locking state of the transmission, a gear state of the transmission, a braking duration of a vehicle and a vehicle running mode;
and when the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the vehicle running mode meet preset conditions, executing the step of calculating the target idling speed of the engine according to the input rotating speed of the transmission.
A second aspect of the invention provides a vehicle engine control system comprising an engine, a transmission, and a controller, the controller comprising a coasting control module,
the coasting control module is used for calculating a target idling speed of an engine according to the input rotating speed of a transmission when the vehicle is in a coasting state; and controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
The vehicle engine control method and the vehicle engine control system have the following beneficial effects:
according to the engine control method and the engine control system, when the vehicle is in a sliding state, the target idle speed of the engine is calculated according to the input rotating speed of the transmission, and the rotating speed of the engine is controlled according to the target idle speed of the engine, so that the rotating speed of the engine is prevented from being lower than or lower than the input rotating speed of the transmission to a greater extent, the rotating speed crossing of the engine is avoided, noise and jitter caused by the rotating speed crossing are eliminated, and the driving experience is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic block diagram of a vehicle engine control system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a process for calculating a target idle speed for an engine based on an input speed of a transmission, according to an embodiment of the present invention;
FIG. 3 is a flow chart schematic of a method for controlling a vehicle engine equipped with a clutch-type transmission according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram of a method for controlling a vehicle engine equipped with a torque converter transmission in accordance with an embodiment of the present invention;
FIG. 5 is a block diagram of a sliding control module according to an embodiment of the present invention;
fig. 6 is a block diagram of another structure of a sliding control module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a vehicle engine system according to an embodiment of the present invention is shown, including an engine 10, a transmission 20 and a controller 30, where the engine 10 is configured to generate torque, and the transmission 20 is configured to transmit the torque generated by the engine 10 to a transmission mechanism 40 of a vehicle, such as one or more wheels of the vehicle. The transmission 20 may include a clutch type transmission (e.g., a dual clutch automatic transmission) and a torque converter type transmission, both of which have a locked state and an unlocked state (including a slipping state and an open state) during operation, and may realize transmission of torque generated by the engine 10 to the transmission mechanism 40 of the vehicle when the transmission 20 is in the locked state, and may not realize transmission of torque generated by the engine 10 when the transmission 20 is in the unlocked state.
In general, when the driver releases the accelerator, i.e., there is no pressure applied to the accelerator pedal, the vehicle is coasting without engine power, and the state in which the vehicle is coasting without engine power may be referred to as the vehicle being in a coasting condition.
The controller 30 is used to control the rotational speed of the engine 10, and thus the torque output of the engine.
The controller 30 may adjust the speed of the engine based on signals from the sensors. For example, an input shaft speed sensor 201 may be used to detect the rotational speed of the input shaft of the clutch transmission and generate an input shaft speed signal; turbine speed sensor 201 may be used to detect the rotational speed of the turbine in the torque converter type sensor and generate a turbine speed signal; the acceleration sensor 202 may be used to detect acceleration while the vehicle is traveling and generate an acceleration signal. Of course, signals generated by the engine coolant temperature sensor 101, the engine water temperature sensor 102, the oil temperature sensor 103, and the like may also be included.
The controller 30 may include a coast identification module 301 and a base idle control module 302. The coasting identification module 301 may be configured to determine whether the current vehicle is in a coasting condition, and the coasting identification module 301 may determine whether the current vehicle enters the coasting condition based on a position of an accelerator pedal. Specifically, the coasting identification module 301 may determine that the vehicle is currently in the coasting condition when the accelerator pedal is in the predetermined position, for example, when the driver completely releases the accelerator pedal, that is, when the duration of the pressure not applied to the accelerator pedal reaches the preset duration. The base idle control module 302 is configured to control the engine speed to decrease to a base idle speed when the vehicle is in a coast condition. The basic idling speed of the engine can be calculated from input signals of sensors such as the engine coolant temperature sensor 101, the engine water temperature sensor 102, and the oil temperature sensor 103, and is generally lower than the input shaft speed of the clutch transmission or the turbine speed of the torque converter transmission.
The controller 30 may further include a coasting control module 303, the coasting control module 303 configured to calculate a target idle speed of the engine based on an input speed of the transmission when the vehicle is in a coasting state; and controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
The embodiment of the invention provides a vehicle engine control method aiming at the problems of noise and shaking existing when an accelerator is stepped to accelerate in the vehicle sliding working condition, and the vehicle engine control method can be applied to a vehicle engine control system shown in figure 1.
The vehicle engine control method of the embodiment of the invention calculates the target idle speed of the engine according to the input rotating speed of the transmission when the vehicle is in a sliding state; the rotational speed of the engine is then controlled based on the calculated target idle speed of the engine.
Specifically, the method of calculating the target idle speed of the engine according to the input rotation speed of the transmission may employ a method shown in fig. 2, and the method may include:
s201: an input speed of the transmission is obtained.
Specifically, the input rotation speed of the transmission may be determined according to the category of the transmission, such as when the transmission is a clutch transmission, the input rotation speed of the transmission is the input shaft rotation speed of the clutch transmission; when the transmission is a torque converter transmission, the input speed of the transmission is the speed of the turbine in the torque converter transmission.
S203: vehicle operating parameters are obtained.
In particular, the vehicle operating parameters may be determined based on the transmission type, such as when the transmission is a clutch type transmission, the vehicle operating parameters may include a requested torque and a vehicle acceleration, where the requested torque is the amount of torque determined based on the accelerator pedal position signal when the vehicle enters a coasting condition.
S205: a rotational speed offset value is determined based on the vehicle operating parameter.
S207: a target idle speed of the engine is calculated based on the input speed of the transmission and a speed offset value.
Therefore, when the vehicle is in a sliding working condition, the invention starts to take measures to control the rotating speed of the engine to be the calculated target idling speed of the engine, thereby reducing the probability and degree that the rotating speed of the engine is lower than the input rotating speed of the transmission, and further avoiding the phenomenon of 'rotating speed crossing' to a greater degree. Compared with the prior art that after the accelerator is stepped on and accelerated, the torque of the engine is limited, so that the torque of the engine is slowly loaded, and the impact and noise caused by the rotation speed crossing are optimized, the invention can fundamentally eliminate the problems of impact noise and jitter caused by the rotation speed crossing.
In addition, the prior art limits the torque of the engine after stepping on the accelerator for acceleration, so that the power response and the power performance of the engine are greatly influenced, the torque of the engine cannot be limited too much when a driver applies a large pressure to an accelerator pedal, and the optimization effect is limited. When the torque of the engine is limited, the torque is limited by other conditions in the engine control, for example, the minimum allowable engine torque at a certain intake air amount is not less than a certain value, which cannot be realized by the measures in the prior art. The method of the invention does not limit the torque of the engine after stepping on the accelerator for acceleration, and can obtain good impact noise and jitter control effect even if applying larger pressure on the accelerator pedal in the sliding working condition.
The following describes in detail a vehicle engine control method according to the present invention, taking as examples a vehicle equipped with a clutch type transmission and a vehicle equipped with a torque converter type transmission.
Referring to fig. 3, a flow chart of a method for controlling an engine of a vehicle equipped with a clutch transmission according to an embodiment of the present invention is shown, and as shown in fig. 3, the method may include:
s301: when the vehicle is in a coasting working condition, the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the driving mode of the vehicle are obtained.
Specifically, the locked state of the transmission may be determined based on an engaged state of the clutch with the engine, which typically includes locked, slipped, and unlocked, and when the engaged state of the clutch with the engine is locked, the locked state of the transmission may be determined to be in the locked state; when the engagement state of the clutch with the engine is slipping or open, the locked state of the transmission may be determined to be an unlocked state.
The gear state of the transmission may include a current gear state and a shift state, and the current gear state of the transmission may be determined according to an operation range requested by the shift lever. The shift state of the transmission includes in-shift and non-shift.
The braking period of the vehicle may be determined based on the time period during which the brake pedal leaves a predetermined position, e.g. the driver has completely released the brake pedal, i.e. no pressure is applied to the brake pedal.
Vehicle travel modes typically include a power module, an economy mode, and a normal mode.
S303: and judging whether the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the running mode of the vehicle meet preset conditions or not.
In the embodiment of the present disclosure, the preset conditions may be that the transmission is in a non-locked state, the current gear state of the transmission is a preset gear range (e.g., a low gear range), the gear shift state of the transmission is in a non-gear shift state, the braking duration of the vehicle is less than the preset braking duration, and the vehicle driving mode is a power mode or a normal mode.
When the judgment result shows that the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the vehicle running mode all meet the preset conditions, step S305 is executed.
S305: an input shaft speed of the clutch transmission and vehicle operating parameters are obtained, including a requested torque and a vehicle acceleration.
Specifically, the requested torque is the torque determined according to the accelerator pedal position signal when the vehicle enters the coasting condition.
S307: a rotational speed offset value is determined based on the requested torque and vehicle acceleration.
Specifically, determining a rotational speed offset value based on the requested torque and vehicle acceleration may employ a method as shown in FIG. 3, which may include:
s3071: and judging whether the requested torque is larger than or equal to a preset first requested torque.
Specifically, when the result of the determination is that the requested torque is greater than or equal to the preset first requested torque, the rotational speed offset value may be determined to be the preset first rotational speed offset value; when the requested torque is smaller than the preset first requested torque as a result of the determination, step S3073 is performed.
S3073: and judging whether the vehicle acceleration is greater than or equal to a preset acceleration.
Specifically, when the result of the determination is that the vehicle acceleration is greater than or equal to the preset acceleration, the rotation speed deviation value may be determined as a preset second rotation speed deviation value; when the result of the determination is that the vehicle acceleration is less than the preset acceleration, step S3075 is performed.
S3075: and determining the rotating speed deviation value as a preset third rotating speed deviation value.
It should be noted that the preset first requested torque, the preset acceleration, the preset first rotational speed offset value, the preset second rotational speed offset value and the preset third rotational speed offset value may be set according to the control requirements for impact noise and jitter in practical applications.
S309: calculating a sum of the input shaft speed of the clutch transmission and the speed offset value, and taking the sum as a target idle speed of the engine.
In the embodiment of the present description, the target idle speed of the engine can be obtained by adding the rotation speed offset value to the rotation speed of the input shaft of the clutch transmission, that is, the target idle speed can be expressed by the following formula:
veyes of a user＝vInput shaft+Δv
Wherein v isEyes of a userIndicating a target idle speed of an engine of a vehicle in which the clutch transmission is arranged; v. ofInput shaftRepresenting an input shaft speed of the clutch-type transmission; Δ v denotes a rotational speed offset value.
S311: judging whether the target idling speed of the engine is larger than the basic idling speed of the engine; and determining whether the requested torque is less than a preset second requested torque.
Specifically, the target idle speed of the engine calculated in step S309 may be compared with a basic idle speed of the engine, the obtained requested torque may be compared with a preset second requested torque, and when the target idle speed of the engine is greater than the basic idle speed of the engine and the requested torque is less than the preset second requested torque, step S313 may be executed.
It should be noted that the preset second request torque may be set according to the control requirements for impact noise and judder in practical applications.
S313: controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
In the embodiment of the present specification, the rotation speed of the engine is a rotation speed of the engine during actual operation. Specifically, controlling the engine speed according to the calculated target idle speed of the engine may be performed in the following manner:
s3131: the target idle speed of the engine is preconditioned to achieve the first rotational speed. The preprocessing here may include upper and lower limit limiting processing for making the first rotation speed obtained from the target idling speed of the engine within a preset upper limit range and lower limit range, and filtering processing for suppressing the target idling speed of the engine in which there is an obvious abnormality.
S3133: a second speed is determined based on the first speed and a base idle speed of the engine. Specifically, the larger value of the first rotation speed of the engine and the basic idle speed of the engine may be taken and taken as the second rotation speed.
S3135: and determining a third rotating speed according to the second rotating speed and the dynamic deviation rotating speed. The dynamic deviation rotating speed is a rotating speed deviation determined according to idle speed increasing requests of other functions of the vehicle, for example, when the vehicle climbs in sliding, the climbing capability is insufficient, and the idle speed needs to be increased to increase the engine capability, at this time, the controller generates a corresponding dynamic deviation rotating speed according to the current idle speed increasing request. Specifically, in determining the third rotational speed, a sum of the second rotational speed and the dynamic deviation rotational speed may be calculated.
S3137: the rotational speed of the engine is controlled to the third rotational speed.
Therefore, for a vehicle equipped with the clutch type transmission, the target idle speed of the engine is higher than the input shaft rotating speed of the transmission, the rotating speed of the vehicle engine entering the sliding working condition is controlled by the target idle speed, and the problem of noise and jitter generated when the accelerator is stepped on for acceleration in the sliding working condition can be fundamentally eliminated.
In addition, the influence of the method provided by the embodiment of the invention on the drivability and the fuel consumption can be reduced through the setting of the preset conditions.
Referring to fig. 4, a flow chart of a method for controlling an engine of a vehicle equipped with a torque converter transmission according to an embodiment of the present invention is shown, and as shown in fig. 4, the method may include:
s401: when the vehicle is in a coasting working condition, the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the driving mode of the vehicle are obtained.
Specifically, the locked state of the transmission may be determined based on the state of the torque converter, which may include locking, slipping, and opening in general, and when the state of the torque converter is locked, it may be determined that the locked state of the transmission is in the locked state; when the state of the torque converter is slipping or open, it may be determined that the locked state of the transmission is the unlocked state.
The gear state of the transmission may include a current gear state and a shift state, and the current gear state of the transmission may be determined according to an operation range requested by the shift lever. The shift state of the transmission includes in-shift and non-shift.
The braking period of the vehicle may be determined based on the time period during which the brake pedal leaves a predetermined position, e.g. the driver has completely released the brake pedal, i.e. no pressure is applied to the brake pedal.
Vehicle travel modes typically include a power module, an economy mode, and a normal mode.
S403: and judging whether the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the running mode of the vehicle meet preset conditions or not.
In the embodiment of the present disclosure, the preset conditions may be that the transmission is in a non-locked state, the current gear state of the transmission is a preset gear range (e.g., a low gear range), the gear shift state of the transmission is in a non-gear shift state, the braking duration of the vehicle is less than the preset braking duration, and the vehicle driving mode is a power mode or a normal mode.
And executing the step S405 when the judgment result shows that the locking state of the transmission, the gear state of the transmission, the braking time of the vehicle and the vehicle running mode all meet the preset conditions.
S405: turbine speed of a torque converter transmission and vehicle operating parameters including vehicle travel mode and brake torque are obtained.
Specifically, the braking torque may be determined based on the position of the brake pedal.
S407: and determining a rotating speed deviation value according to the vehicle running mode and the braking torque.
Specifically, determining a rotational speed offset value based on the requested torque and vehicle acceleration may be performed as follows:
s4071, acquiring a corresponding preset rotation speed deviation value range according to the vehicle running mode.
In the embodiment of the present specification, the corresponding relationship between the vehicle running mode and the range of the deviation value of the rotation speed may be established in advance, for example, a range of a preset first deviation value of the rotation speed is set for the power mode, a range of a preset second deviation value of the rotation speed is set for the economy mode, and a range of a preset third deviation value of the rotation speed is set for the normal mode. The ranges of the rotational speed offset values may be set according to the control requirements for the impulsive noise and the judder in each driving mode in practical use.
When the current driving mode of the vehicle is determined, a corresponding preset range of the rotational speed offset value may be obtained from a pre-established correspondence relationship between the driving mode of the vehicle and the range of the rotational speed offset value.
S4073, according to the braking torque, obtaining a rotating speed deviation value from the corresponding preset rotating speed deviation value range.
Generally speaking, within the range of the preset rotation speed deviation value, the braking torque and the rotation speed deviation value have a positive correlation in a linear relationship, i.e. the larger the braking torque, the larger the rotation speed deviation value. Specifically, within each preset range of the rotational speed deviation value, the linear relationship between the braking torque and the rotational speed deviation value can be set according to the control requirements for impact noise and jitter in practical applications.
S409: calculating a difference between the turbine speed and the speed offset value and using the difference as a target idle speed of the engine.
In the embodiment of the present disclosure, the target idle speed of the engine may be obtained by subtracting the offset value of the rotation speed from the rotation speed of the turbine, that is, the target idle speed may be expressed by the following formula:
veyes of a user＝vTurbine wheel-Δv
Wherein v isEyes of a userIndicating a target idle speed of an engine of a vehicle equipped with a torque converter transmission; v. ofTurbine wheelRepresenting the turbine speed; Δ v denotes a rotational speed offset value.
S411: controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
In the embodiment of the present specification, the rotation speed of the engine is a rotation speed of the engine during actual operation. Specifically, controlling the engine speed according to the calculated target idle speed of the engine may be performed in the following manner:
s4111: the target idle speed of the engine is preconditioned to achieve the first rotational speed. The preprocessing here may include upper and lower limit limiting processing for making the first rotation speed obtained from the target idling speed of the engine within a preset upper limit range and lower limit range, and filtering processing for suppressing the target idling speed of the engine in which there is an obvious abnormality.
S4113: a second speed is determined based on the first speed and a base idle speed of the engine. Specifically, the larger value of the first rotation speed of the engine and the basic idle speed of the engine may be taken and taken as the second rotation speed.
S4115: and determining a third rotating speed according to the second rotating speed and the dynamic deviation rotating speed. The dynamic deviation rotating speed is a rotating speed deviation determined according to idle speed increasing requests of other functions of the vehicle, for example, when the vehicle climbs in sliding, the climbing capability is insufficient, and the idle speed needs to be increased to increase the engine capability, at this time, the controller generates a corresponding dynamic deviation rotating speed according to the current idle speed increasing request. Specifically, in determining the third rotational speed, a sum of the second rotational speed and the dynamic deviation rotational speed may be calculated.
S4117: the rotational speed of the engine is controlled to the third rotational speed.
Therefore, for a vehicle provided with the hydraulic torque converter type transmission, the rotating speed of the engine in a sliding working condition can be controlled through the target idle speed of the engine, and the rotating speed of the engine is prevented from being excessively lower than the rotating speed of the turbine when the vehicle enters the sliding working condition, so that the problems of impact noise and shaking caused by rotating speed ride-through are well improved on the basis of not influencing the power response and the power performance of the engine when the vehicle is slid and accelerated.
In addition, the influence of the method provided by the embodiment of the invention on the drivability and the fuel consumption can be reduced through the setting of the preset conditions.
Corresponding to the vehicle engine control method provided by the above embodiment, the embodiment of the present specification further provides a vehicle engine control system, as shown in fig. 1, the control system includes an engine, a transmission, and a controller, the controller includes a coasting control module, and the coasting control module is configured to calculate a target idling speed of the engine according to an input rotation speed of the transmission when the vehicle is in a coasting state; and controlling the rotation speed of the engine according to the calculated target idle speed of the engine.
Referring to fig. 5 and 6, the coasting control module may include a target idle speed calculation module and an engine speed control module.
The target idle speed calculation module is used for calculating a target idle speed of the engine according to the input rotating speed of the transmission when the vehicle is in a coasting state. The target idle speed calculation module can comprise a first obtaining module, a first determining module and a calculation submodule, wherein the first obtaining module is used for obtaining the input rotating speed of the transmission and the vehicle operation parameters; the first determining module is used for determining a rotating speed deviation value according to vehicle operating parameters; the calculation submodule is configured to calculate a target idle speed of the engine based on the input speed of the transmission and the speed offset value.
Taking a vehicle equipped with a clutch-type transmission as an example, as shown in fig. 5, the first obtaining module may include an input shaft speed module and an operating parameter module. Wherein the input shaft speed module may receive an input shaft speed signal from an input shaft speed sensor indicative of an input shaft rotational speed; the operation parameter module can comprise a torque request module and an acceleration module, wherein the torque request module can acquire the torque requested by the driver when the vehicle enters the coasting working condition, and particularly can receive an accelerator pedal position signal representing the position of an accelerator pedal from an accelerator pedal position sensor and determine the magnitude of the requested torque according to the accelerator pedal position signal; the acceleration module may receive an acceleration signal from an acceleration sensor while the vehicle is traveling.
The first determining module may determine whether the requested torque of the torque requesting module is greater than or equal to a preset first requested torque when determining a rotational speed offset value according to the requested torque and the vehicle acceleration, and determine the rotational speed offset value as the preset first rotational speed offset value when the requested torque is greater than or equal to the preset first requested torque; when the requested torque is smaller than a preset first requested torque, judging whether the vehicle acceleration of the acceleration module is larger than or equal to a preset acceleration or not, and when the vehicle acceleration is larger than or equal to the preset acceleration, determining the rotating speed deviation value as a preset second rotating speed deviation value; and when the acceleration of the vehicle is smaller than the preset acceleration, determining the rotating speed deviation value as a preset third rotating speed deviation value.
It should be noted that the preset first requested torque, the preset acceleration, the preset first rotational speed offset value, the preset second rotational speed offset value and the preset third rotational speed offset value may be set according to the control requirements for impact noise and jitter in practical applications.
The calculation submodule may specifically calculate a sum of the input shaft speed of the clutch transmission and the speed offset value, and use the sum as the target idle speed of the engine.
As shown in fig. 5, the coasting control module may further include a first determining module, a second determining module, and an executing module. The first judgment module is used for judging whether the target idle speed of the engine calculated by the target idle speed calculation module is larger than the basic idle speed of the engine given by the basic idle speed control module; the second judging module is used for judging whether the torque requested by the torque requesting module is smaller than a preset second requested torque; the execution module is used for sending an execution signal to the engine rotating speed control module when the judgment results of the first judgment module and the second judgment module are both yes, so that the engine rotating speed control module works.
Taking a vehicle equipped with a torque converter transmission as an example, as shown in FIG. 6, the first acquisition module may include a turbine speed module and an operating parameter module. Wherein the turbine speed module may receive a turbine speed signal from a turbine speed sensor indicative of a turbine speed of rotation; the operating parameter module may include a travel mode module that may receive a driver selection signal of a travel mode of the vehicle and a brake torque module that may receive a brake pedal position signal from a brake pedal position sensor indicative of a brake pedal position and determine a magnitude of a brake torque based on the brake pedal position signal.
When the first determining module determines the rotating speed deviation value according to the vehicle running mode and the braking torque, the corresponding preset rotating speed deviation value range can be obtained according to the vehicle running mode, and then the corresponding rotating speed deviation value is obtained from the preset rotating speed deviation value range according to the braking torque. Generally speaking, within the range of the preset rotation speed deviation value, the braking torque and the rotation speed deviation value have a positive correlation in a linear relationship, i.e. the larger the braking torque, the larger the rotation speed deviation value. Specifically, the vehicle driving modes generally include a power mode, an economy mode, and a normal mode, and accordingly, a preset rotation speed offset value range corresponding to each vehicle driving mode may be preset.
The calculation submodule may specifically calculate a difference between the turbine speed and the speed offset value and use the difference as a target idle speed of the engine.
As shown in FIGS. 5 and 6, the engine speed control module may include a preprocessing module, a second determination module, a third determination module, and a control sub-module.
The preprocessing module can be used for preprocessing the target idling speed of the engine calculated by the target idling speed calculating module to obtain a first rotating speed of the engine. Specifically, the preprocessing mode may include upper and lower limit limiting processing and filtering processing, where the upper and lower limit limiting processing is used to enable a first rotation speed obtained according to a target idle speed of the engine to be within a preset upper limit range and a preset lower limit range, and the filtering processing is used to suppress the target idle speed of the engine with obvious abnormality.
The second determination module may be configured to determine a second speed of the engine based on the first speed and a base idle speed of the engine. Specifically, the larger value of the first rotation speed of the engine and the basic idle speed of the engine may be taken and taken as the second rotation speed.
The third determination module may be configured to determine a third speed based on the second speed and the dynamic deviation speed. The dynamic deviation rotating speed is a rotating speed deviation determined according to idle speed increasing requests of other functions of the vehicle, for example, when the vehicle climbs in sliding, the climbing capability is insufficient, and the idle speed needs to be increased to increase the engine capability, at this time, the controller generates a corresponding dynamic deviation rotating speed according to the current idle speed increasing request. Specifically, in determining the third rotational speed, a sum of the second rotational speed and the dynamic deviation rotational speed may be calculated.
The control sub-module may be configured to control the rotational speed of the engine to a third rotational speed obtained by the third determining module.
With continued reference to fig. 5 and 6, the coasting control module may further include a coasting control enabling module that may determine whether a preset condition is satisfied based on signals of the transmission locking state determination module, the transmission gear state determination module, the brake timing module, and the driving mode selection module, and send a signal to the target idle speed calculation module to cause the target idle speed calculation module to calculate the target idle speed of the engine when the preset condition is satisfied. Specifically, when the transmission is in the non-lock state, the transmission is in a preset gear range (for example, a low gear range) and a non-shift state, the braking duration of the vehicle is less than the preset braking duration, and the vehicle running mode is a power module or a normal mode, it may be determined that the preset condition is satisfied.
In summary, the vehicle engine control system according to the embodiment of the present invention starts to take measures to control the rotational speed of the engine to the calculated target idle speed of the engine when the vehicle is in the coasting condition, so as to reduce the probability and degree that the rotational speed of the engine is lower than the input rotational speed of the transmission, thereby avoiding the occurrence of the "rotational speed crossing" phenomenon to a greater extent. Compared with the prior art that after the accelerator is stepped on and accelerated, the torque of the engine is limited, so that the torque of the engine is slowly loaded, and the impact and noise caused by the rotation speed crossing are optimized, the invention can fundamentally eliminate the problems of impact noise and jitter caused by the rotation speed crossing.
In addition, the prior art limits the torque of the engine after stepping on the accelerator for acceleration, so that the power response and the power performance of the engine are greatly influenced, the torque of the engine cannot be limited too much when a driver applies a large pressure to an accelerator pedal, and the optimization effect is limited. When the torque of the engine is limited, the torque is limited by other conditions in the engine control, for example, the minimum allowable engine torque at a certain intake air amount is not less than a certain value, which cannot be realized by the measures in the prior art. The method of the invention does not limit the torque of the engine after stepping on the accelerator for acceleration, and can obtain good impact noise and jitter control effect even if applying larger pressure on the accelerator pedal in the sliding working condition.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (9)
1. A vehicle engine control method, characterized by comprising:
calculating a target idle speed of an engine according to an input rotation speed of a transmission when the vehicle is in a coasting state;
preprocessing the target idle speed of the engine to obtain a first rotating speed;
determining a second rotation speed according to the first rotation speed and the basic idle speed of the engine;
determining a third rotating speed according to the second rotating speed and the dynamic deviation rotating speed;
and controlling the rotating speed of the engine to be the third rotating speed.
2. The vehicle engine control method according to claim 1, characterized in that the calculating the target idle speed of the engine according to the input rotation speed of the transmission includes:
acquiring an input rotating speed of a transmission;
obtaining vehicle operating parameters;
determining a rotational speed offset value according to the vehicle operating parameter;
a target idle speed of the engine is calculated based on the input speed of the transmission and a speed offset value.
3. The vehicle engine control method according to claim 2, characterized in that the transmission includes a clutch type transmission;
correspondingly, the input rotating speed of the transmission is the rotating speed of an input shaft of the clutch type transmission;
the vehicle operating parameters include: requested torque and vehicle acceleration;
the determining a rotational speed offset value based on the vehicle operating parameter comprises:
a rotational speed offset value is determined based on the requested torque and vehicle acceleration.
4. The vehicle engine control method of claim 3, wherein said calculating a target idle speed of the engine as a function of the input speed of the transmission and a speed offset value comprises:
calculating a sum of the input shaft speed of the clutch transmission and the speed offset value, and taking the sum as a target idle speed of the engine.
5. The vehicle engine control method according to claim 3 or 4, characterized in that before controlling the rotation speed of the engine according to the calculated target idle speed of the engine, the method further comprises:
judging whether the target idling speed of the engine is larger than the basic idling speed of the engine; and
judging whether the requested torque is smaller than a preset second requested torque or not;
and if the result of the judgment is yes, executing the step of controlling the rotating speed of the engine according to the calculated target idling speed of the engine.
6. The vehicle engine control method according to claim 2, characterized in that the transmission includes a torque converter type transmission;
correspondingly, the input rotating speed of the transmission is the turbine rotating speed of the hydraulic torque converter type transmission;
the vehicle operating parameters include: vehicle travel mode and brake torque;
the determining a rotational speed offset value based on the vehicle operating parameter comprises:
and determining a rotating speed deviation value according to the vehicle running mode and the braking torque.
7. The vehicle engine control method of claim 6, wherein said calculating a target idle speed of the engine as a function of the input speed of the transmission and a speed offset value comprises:
calculating a difference between the turbine speed and the speed offset value and using the difference as a target idle speed of the engine.
8. The vehicle engine control method according to claim 1, characterized in that before calculating the target idle speed of the engine from the input rotation speed of the transmission, the method further comprises:
acquiring a locking state of the transmission, a gear state of the transmission, a braking duration of a vehicle and a vehicle running mode;
and when the locking state of the transmission, the gear state of the transmission, the braking duration of the vehicle and the vehicle running mode meet preset conditions, executing the step of calculating the target idling speed of the engine according to the input rotating speed of the transmission.
9. A vehicle engine control system, comprising an engine, a transmission, and a controller, the controller comprising a coasting control module,
the coasting control module is used for calculating a target idling speed of an engine according to the input rotating speed of a transmission when the vehicle is in a coasting state; and pre-processing the target idle speed of the engine to obtain a first rotating speed; determining a second rotation speed according to the first rotation speed and the basic idle speed of the engine; determining a third rotating speed according to the second rotating speed and the dynamic deviation rotating speed; and controlling the rotating speed of the engine to be the third rotating speed.
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| CN113525333B (en) * | 2020-04-21 | 2023-04-07 | 上海汽车集团股份有限公司 | Anti-impact method and device for stepping on accelerator of vehicle carrying automatic gearbox and automobile |
| CN112026778A (en) * | 2020-09-11 | 2020-12-04 | 北京汽车集团越野车有限公司 | Method and device for improving driving smoothness of automatic transmission vehicle |
| CN112901763B (en) * | 2021-01-15 | 2022-06-24 | 浙江吉利控股集团有限公司 | Control method and control system of gearbox and vehicle |
| CN112943887B (en) * | 2021-01-29 | 2022-07-26 | 浙江吉利控股集团有限公司 | Vehicle brake control method and device |
| CN113236682B (en) * | 2021-05-31 | 2023-03-31 | 蜂巢传动科技河北有限公司 | Method and device for controlling sliding of double clutches, vehicle and storage medium |
| CN113586266A (en) * | 2021-08-31 | 2021-11-02 | 重庆长安汽车股份有限公司 | Engine rotating speed control method and system of automatic transmission type |
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