CN113928323B - Method, device and storage medium for limiting energy recovery of transmission of vehicle - Google Patents

Method, device and storage medium for limiting energy recovery of transmission of vehicle Download PDF

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Publication number
CN113928323B
CN113928323B CN202111274885.0A CN202111274885A CN113928323B CN 113928323 B CN113928323 B CN 113928323B CN 202111274885 A CN202111274885 A CN 202111274885A CN 113928323 B CN113928323 B CN 113928323B
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transmission
torque
limiting
vehicle
recovery
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CN113928323A (en
Inventor
张佳六
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Honeycomb Transmission Technology Hebei Co Ltd
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Honeycomb Transmission Technology Hebei Co Ltd
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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
    • B60W30/188—Controlling power parameters of the driveline, e.g. determining the required power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1015—Input shaft speed, e.g. turbine speed
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1025—Input torque
    • 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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/10—Change speed gearings
    • B60W2710/105—Output torque

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The invention discloses a vehicle transmission energy recovery limiting method, a device and a storage medium, wherein the vehicle transmission energy recovery limiting method comprises the following steps: acquiring the rotating speed of an input end of a transmission and the gear of a working shaft; determining available recovery torque of the transmission according to the input end rotating speed of the transmission and the working shaft gear; and determining the driving condition of the vehicle, and limiting the available recovery torque of the transmission according to the driving condition in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission. Therefore, according to the real-time driving condition of the vehicle, the available recovery torque of the transmission is limited in time, so that the driving stability and reliability of the vehicle during sliding and braking are ensured in the process of energy recovery control of the vehicle, and the driving experience of a user is improved.

Description

Method, device and storage medium for limiting energy recovery of transmission of vehicle
Technical Field
The present invention relates to the field of vehicle energy recovery technologies, and in particular, to a vehicle transmission energy recovery limiting method, a computer readable storage medium, and a vehicle transmission energy recovery limiting device.
Background
Currently, when a hybrid vehicle is equipped with a motor on a power train (P2 architecture) at the front end of an automatic transmission or a power train equipped with a transmission only with a motor, a transmission is required to support the recovery of sliding energy and the recovery of braking energy when a throttle is released or the brake is stepped on during running.
However, the related art has a problem in that the transmission provides only the maximum capability value that can be tolerated by each gear to the whole vehicle controller (HCU hybrid control unit, CCU central control unit, or VCU vehicle control unit), but the whole vehicle controller may not determine the influence of energy recovery on the drivability of the transmission due to the diversification of the actual driving conditions of the vehicle, resulting in drivability problems, such as an excessively low input rotation speed when the vehicle brakes, and an excessively fast energy recovery exit when the vehicle downshifts, an increasing gradient of the input rotation speed, resulting in drivability problems such as an impact.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a method for limiting energy recovery of a transmission of a vehicle, which can ensure driving stability and reliability of the vehicle during coasting and braking during energy recovery control of the vehicle, and improve driving experience of a user.
A second object of the present invention is to propose a computer readable storage medium.
A third object of the present invention is to propose a transmission energy recovery limiting device of a vehicle.
To achieve the above object, a transmission energy recovery limiting method for a vehicle according to an embodiment of a first aspect of the present invention includes the steps of: acquiring the rotating speed of an input end of a transmission and the gear of a working shaft; determining available recuperation torque of the transmission based on an input speed of the transmission and a working shaft gear; and determining the driving condition of the vehicle, and limiting the available recovery torque of the transmission according to the driving condition in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission.
According to the transmission energy recovery limiting method of the vehicle, the input end rotating speed and the working shaft gear of the transmission are obtained, the available recovery torque of the transmission is determined according to the input end rotating speed and the working shaft gear of the transmission, the driving working condition of the vehicle is determined, and in the process of controlling the vehicle energy recovery according to the available recovery torque of the transmission, the available recovery torque of the transmission is limited according to the driving working condition. Therefore, according to the real-time driving condition of the vehicle, the available recovery torque of the transmission is limited in time, so that the driving stability and reliability of the vehicle during sliding and braking are ensured in the process of energy recovery control of the vehicle, and the driving experience of a user is improved.
In addition, the transmission energy recovery limiting method of the vehicle according to the above embodiment of the invention may further have the following additional technical features:
according to one embodiment of the invention, limiting the available recuperation torque of the transmission according to the driving conditions comprises: and when the driving condition is a sliding downshift condition, the speed ratio of the transmission is monitored, and the change rate of the available recovery torque of the transmission is limited when the speed ratio of the transmission is changed.
According to one embodiment of the invention, limiting the available recuperation torque of the transmission according to the driving conditions comprises: and when the driving working condition is a throttle releasing working condition in the upshift process, acquiring the input end torque of the transmission and the accelerator pedal opening of the vehicle, determining the limiting torque of the transmission according to the input end torque of the transmission when the accelerator pedal opening of the vehicle is smaller than a preset opening threshold value, and limiting the available recovery torque of the transmission according to the limiting torque of the transmission.
According to one embodiment of the invention, determining a limiting torque of the transmission from an input torque of the transmission comprises: and taking the negative value of the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the negative value of the torque at the input end of the transmission to change according to a first preset gradient until a preset limiting torque threshold value is reached.
According to one embodiment of the invention, the limiting torque of the transmission is controlled to be changed to the initial limiting value according to a second preset gradient when the vehicle ends the upshift process.
According to one embodiment of the invention, limiting the available recuperation torque of the transmission according to the driving conditions comprises:
and when the driving working condition is a brake pedal working condition in the process of downshifting, acquiring the input end torque of the transmission, the main state of the clutch and the downshift sub-state, and when the main state of the clutch is downshifting and the downshift sub-state is Coasting, determining the limiting torque of the transmission according to the input end torque of the transmission, and limiting the available recovery torque of the transmission according to the limiting torque of the transmission.
According to one embodiment of the invention, determining a limiting torque of the transmission from an input torque of the transmission comprises: and taking the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the torque at the input end of the transmission to change according to a third preset gradient until a preset limiting torque threshold value is reached.
According to one embodiment of the invention, the limiting torque of the transmission is controlled to be changed to the initial limiting value according to a fourth preset gradient when the vehicle ends the downshift process.
To achieve the above object, an embodiment of the second aspect of the present invention provides a computer-readable storage medium having stored thereon a transmission energy recovery limiting program of a vehicle, which when executed by a processor, implements a transmission energy recovery limiting method of a vehicle as described above.
According to the computer readable storage medium, through executing the transmission energy recovery limiting program of the vehicle stored on the computer readable storage medium, the driving stability and reliability of the vehicle during sliding and braking can be ensured in the process of controlling the energy recovery of the vehicle, and the driving experience of a user is improved.
To achieve the above object, a transmission energy recovery limiting device for a vehicle according to an embodiment of a third aspect of the present invention includes: the acquisition module is used for acquiring the rotating speed of the input end of the transmission and the gear of the working shaft; the recovery torque determining module is used for determining available recovery torque of the transmission according to the input end rotating speed and the working shaft gear of the transmission; and the recovery torque limiting module is used for determining the driving condition of the vehicle and limiting the available recovery torque of the transmission according to the driving condition in the process of carrying out energy recovery control on the vehicle according to the available recovery torque of the transmission.
According to the transmission energy recovery limiting device of the vehicle, the acquisition module is used for acquiring the input end rotating speed and the working shaft gear of the transmission, the recovery torque determining module is used for determining the available recovery torque of the transmission according to the input end rotating speed and the working shaft gear of the transmission, the recovery torque limiting module is used for determining the driving condition of the vehicle, and in the process of controlling the energy recovery of the vehicle according to the available recovery torque of the transmission, the available recovery torque of the transmission is limited according to the driving condition. Therefore, according to the real-time driving condition of the vehicle, the available recovery torque of the transmission is limited in time, so that the driving stability and reliability of the vehicle during sliding and braking are ensured in the process of energy recovery control of the vehicle, and the driving experience of a user is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart diagram of a transmission energy recovery limiting method for a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a transmission energy recovery limiting method for a vehicle during a coasting downshift condition in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a transmission energy recovery limiting method for a vehicle during a loose-door condition during an upshift in accordance with one embodiment of the invention;
FIG. 4 is a schematic illustration of a method for limiting transmission energy recovery in a vehicle during a downshift event when a brake pedal is engaged in accordance with an embodiment of the present invention;
FIG. 5 is a block schematic diagram of a transmission energy recovery limiting device of a vehicle according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A transmission energy recovery limiting method of a vehicle, a computer-readable storage medium, and a transmission energy recovery limiting device of a vehicle according to embodiments of the present invention are described below with reference to the accompanying drawings.
FIG. 1 is a flow chart diagram of a transmission energy recovery limiting method for a vehicle according to an embodiment of the present invention. As shown in fig. 1, the transmission energy recovery limiting method of the vehicle includes the steps of:
s101, acquiring the input end rotating speed and the working shaft gear of the transmission.
It is appreciated that the TCU (Transmission Control Unit TCU, transmission control unit) may obtain the input speed of the transmission by obtaining the engine or motor speed of the vehicle and the operating shaft gear by obtaining the current gear of the vehicle.
S102, determining available recovery torque of the transmission according to the input end rotating speed of the transmission and the working shaft gear.
It should be appreciated that the available recuperation torque of the transmission varies with the input speed and the operating shaft gear of the transmission, wherein the lower the input speed and the operating shaft gear of the transmission, the lower the available recuperation torque of the transmission.
S103, determining the driving condition of the vehicle, and limiting the available recovery torque of the transmission according to the driving condition in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission.
It can be appreciated that in the embodiment of the invention, in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission, the available recovery torque of the transmission can be further limited according to different driving conditions, so that the driving stability and reliability of the vehicle during coasting and braking are ensured, and the driving experience of a user is improved.
The available recovery torque limiting strategy for a transmission when the driving condition of the vehicle is a coasting downshift condition is described below with reference to fig. 2 and one embodiment of the present invention.
Further, limiting the available recuperation torque of the transmission according to the driving conditions includes: and when the driving condition is a sliding downshift condition, the speed ratio of the transmission is monitored, and the change rate of the available recovery torque of the transmission is limited when the speed ratio of the transmission is changed.
Specifically, as shown in fig. 2, after the vehicle enters normal driving, the available recovery torque of the transmission is determined according to the input end rotating speed of the transmission and the working shaft gear, and in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission, if the driving condition of the vehicle is determined to be a sliding down gear condition, the speed ratio of the transmission is monitored, and when the speed ratio of the transmission is changed, the change rate of the available recovery torque of the transmission is limited, so that the influence of the lifting of the rotating speed of the input end of the transmission on the available recovery torque of the transmission in the sliding down gear condition is avoided, the available recovery torque of the transmission does not obviously fluctuate in the sliding down gear condition, and the stability and reliability of the vehicle in the sliding down gear condition are ensured.
It should be appreciated that, since the operating shaft gear of the transmission is reduced from a high gear to a low gear during a coast down condition, a transient increase in the input rotational speed of the transmission may occur, at which time, if the available recovery torque of the transmission continues to change along with the change in the input rotational speed of the transmission and the speed ratio of the transmission, a fluctuation in vehicle rotational speed control may result, and therefore, in an embodiment of the present invention, the rate of change of the available recovery torque of the transmission is limited when the speed ratio of the transmission changes, thereby reducing the fluctuation in the available recovery torque of the transmission during a vehicle down-shift up-shift, and ensuring the stability and reliability of the vehicle during the coast down condition.
After the vehicle finishes the coast down shift condition, the available recovery torque of the transmission may be determined again according to the input end rotation speed of the transmission and the working shaft gear, and the vehicle may be subjected to energy recovery control according to the available recovery torque of the transmission, that is, the available recovery torque of the transmission decreases with the decrease of the input end rotation speed of the transmission and the working shaft gear until the input end rotation speed of the transmission approaches the idle speed control section of the engine, at which time the available recovery torque of the transmission decreases to 0, and the engine may be controlled to smoothly transition to the idle speed control.
An available recovery torque limiting strategy for a transmission when the driving condition of the vehicle is a stuck-at condition during an upshift is described below with reference to fig. 3 and one embodiment of the present invention.
Further, limiting the available recuperation torque of the transmission according to the driving conditions includes: when the driving condition is a throttle release condition in the upshift process, the input end torque of the transmission and the accelerator pedal opening of the vehicle are obtained, when the accelerator pedal opening of the vehicle is smaller than a preset opening threshold value, the limiting torque of the transmission is determined according to the input end torque of the transmission, and the available recovery torque of the transmission is limited according to the limiting torque of the transmission.
Specifically, as shown in fig. 3, in the process of performing energy recovery control on the vehicle by using the available recovery torque of the transmission, if it is determined that the driving condition of the vehicle is a throttle-released condition in the upshift process, the input end torque of the transmission and the accelerator pedal opening of the vehicle are obtained, and when the accelerator pedal opening of the vehicle is smaller than a preset opening threshold value, the limitation torque of the transmission is determined according to the input end torque of the transmission, and the available recovery torque of the transmission is limited according to the limitation torque of the transmission.
Alternatively, the preset opening threshold may be set accordingly according to the actual output capacity of the transmission.
Further, as shown in FIG. 3, determining the torque limit of the transmission based on the input torque of the transmission includes: and taking the negative value of the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the negative value of the torque at the input end of the transmission to change according to a first preset gradient until the preset limiting torque threshold value is reached.
It should be appreciated that, in the working condition of the throttle in the vehicle during the upshift, the working shaft gear of the transmission is increased from the low gear to the high gear, so that the input end rotation speed of the transmission is reduced, at this time, if the available recovery torque of the transmission is inserted too fast, the input end rotation speed of the transmission is reduced too fast, and the stability and reliability of the vehicle are affected.
Alternatively, the preset limiting torque threshold may be set accordingly according to a target gear in the upshift process, and the first preset gradient may be set accordingly according to an actual output capacity of the transmission.
Further, as shown in fig. 3, at the end of the upshift process of the vehicle, the restriction torque of the transmission is controlled to be changed to the initial restriction value in accordance with the second preset gradient.
After the throttle working condition is released in the process of ending the upshift of the vehicle, the available recovery torque of the transmission can be determined again according to the input end rotating speed of the transmission and the working shaft gear, and the vehicle is subjected to energy recovery control according to the available recovery torque of the transmission, namely, when the vehicle ends the upshift of the vehicle, the limiting torque of the transmission is controlled to be changed to an initial limiting value according to a second preset gradient, so that the available recovery torque of the transmission is smoothly changed from a preset limiting torque threshold value to the initial limiting value of the available recovery torque of the transmission, and the stability and the reliability of the vehicle are further improved.
Alternatively, the second preset gradient change may be set accordingly according to the actual output capacity of the transmission.
It should be understood that, in the working condition of the throttle in the vehicle upshift process, the working shaft gear of the transmission is increased from the low gear to the high gear, so that the rotation speed of the input end of the transmission can be reduced, at this time, if the available recovery torque of the transmission is too fast, the rotation speed of the input end of the transmission can be reduced too fast, and the stability and reliability of the vehicle are affected.
The available recovery torque limiting strategy for a transmission when the vehicle driving condition is a brake pedal condition during a downshift is described below with reference to fig. 4 and an embodiment of the present invention.
Further, limiting the available recuperation torque of the transmission according to the driving conditions includes: when the driving condition is a brake pedal operating condition in the process of downshifting, the input end torque of the transmission, the main state of the clutch and the downshift sub-state are obtained, when the main state of the clutch is downshifting and the downshift sub-state is Coasting, the limiting torque of the transmission is determined according to the input end torque of the transmission, and the available recovery torque of the transmission is limited according to the limiting torque of the transmission.
Specifically, as shown in fig. 4, in the process of performing energy recovery control on the vehicle by using the available recovery torque of the transmission, if it is determined that the driving condition of the vehicle is a brake pedal operating condition in the process of a downshift, the input torque of the transmission and the main state and the downshift sub-state of the clutch are obtained, and when the main state of the clutch is the downshift and the downshift sub-state is the Coasting, the limitation torque of the transmission is determined according to the input torque of the transmission, and the available recovery torque of the transmission is limited according to the limitation torque of the transmission.
Further, as shown in FIG. 4, determining the torque limit of the transmission from the input torque of the transmission includes: and taking the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the torque at the input end of the transmission to change according to a third preset gradient until the preset limiting torque threshold value is reached.
It should be understood that, because the vehicle may be in a state that the vehicle is in a fast state when stepping on the brake pedal in the process of downshifting, at this time, the working shaft of the transmission is in a continuous downshift, which results in a larger variation range of the rotational speed of the input end of the transmission and affects the stability and reliability of the vehicle.
Alternatively, the preset limiting torque threshold may be set accordingly according to a target gear during a downshift, and the third preset gradient may be set accordingly according to an actual output capacity of the transmission.
Further, as shown in fig. 4, at the time of the vehicle end downshift process, the restriction torque of the transmission is controlled to be changed to the initial restriction value in accordance with the fourth preset gradient.
After the vehicle finishes the working condition of stepping on the brake pedal in the process of downshifting, the available recovery torque of the transmission can be determined again according to the rotating speed of the input end of the transmission and the gear of the working shaft, and the vehicle is subjected to energy recovery control according to the available recovery torque of the transmission, namely, when the vehicle finishes the downshifting, the limiting torque of the transmission is controlled to be changed to an initial limiting value according to a fourth preset gradient, so that the available recovery torque of the transmission is smoothly changed from a preset limiting torque threshold value to the initial limiting value of the available recovery torque of the transmission, and the stability and the reliability of the vehicle are further improved.
Alternatively, the preset limiting torque threshold may be set accordingly according to a target gear during a downshift, and the fourth preset gradient may be set accordingly according to an actual output capacity of the transmission.
In summary, according to the transmission energy recovery limiting method of the vehicle of the embodiment of the invention, the input end rotating speed and the working shaft gear of the transmission are obtained, the available recovery torque of the transmission is determined according to the input end rotating speed and the working shaft gear of the transmission, the driving condition of the vehicle is determined, and in the process of controlling the vehicle energy recovery according to the available recovery torque of the transmission, the available recovery torque of the transmission is limited according to the driving condition. Therefore, according to the real-time driving condition of the vehicle, the available recovery torque of the transmission is limited in time, so that the driving stability and reliability of the vehicle during sliding and braking are ensured in the process of energy recovery control of the vehicle, and the driving experience of a user is improved.
Further, based on the foregoing transmission energy recovery limiting method of the vehicle according to the embodiment of the invention, the embodiment of the invention proposes a computer-readable storage medium having stored thereon a transmission energy recovery limiting program of the vehicle, which when executed by a processor implements the transmission energy recovery limiting method of the vehicle according to the foregoing embodiment of the invention.
It should be noted that, when executing the above-mentioned transmission energy recovery limiting program of the vehicle, the computer readable storage medium of the embodiment of the present invention can implement a specific implementation manner corresponding to the transmission energy recovery limiting method of the vehicle of the embodiment of the present invention, which is not described herein.
In summary, according to the computer-readable storage medium of the embodiment of the present invention, by executing the transmission energy recovery restriction program of the vehicle stored thereon, it is possible to ensure the driving stability and reliability of the vehicle during coasting and braking and to improve the user's riding experience in the process of performing energy recovery control on the vehicle.
FIG. 5 is a block schematic diagram of a transmission energy recovery limiting device of a vehicle according to an embodiment of the invention. As shown in fig. 5, the transmission energy recovery limiting device 100 of the vehicle includes: an acquisition module 10, a recovery torque determination module 20, and a recovery torque limit module 30.
Specifically, the acquisition module 10 is configured to acquire an input end rotation speed and a working shaft gear of the transmission; the recuperation torque determining module 20 is used to determine the available recuperation torque of the transmission based on the input speed of the transmission and the operating shaft gear; the recuperation torque limiting module 30 determines a driving condition of the vehicle and limits the available recuperation torque of the transmission according to the driving condition during an energy recuperation control of the vehicle according to the available recuperation torque of the transmission.
Further, the recuperation torque limiting module 30 is also configured to monitor the speed ratio of the transmission when the driving condition is a coast down shift condition, and limit the rate of change of the available recuperation torque of the transmission when the speed ratio of the transmission changes.
Further, the recovery torque limiting module 30 is further configured to obtain an input torque of the transmission and an accelerator pedal opening of the vehicle when the driving condition is a throttle condition during an upshift, determine a limiting torque of the transmission according to the input torque of the transmission when the accelerator pedal opening of the vehicle is less than a preset opening threshold, and limit an available recovery torque of the transmission according to the limiting torque of the transmission.
Further, the recovery torque limiting module 30 is further configured to take a negative value of the input torque of the transmission as the limiting torque of the transmission, and control the negative value of the input torque of the transmission to change according to a first preset gradient until a preset limiting torque threshold is reached.
Further, the recovery torque limiting module 30 is further configured to control the limiting torque of the transmission to be changed to the initial limiting value according to a second preset gradient when the vehicle ends the upshift process.
Further, the recovery torque limiting module 30 is further configured to obtain an input torque of the transmission and a downshift sub-state of the clutch when the driving condition is a brake pedal condition during a downshift, determine a limiting torque of the transmission according to the input torque of the transmission when the downshift sub-state of the clutch is downshift Coasting, and limit an available recovery torque of the transmission according to the limiting torque of the transmission.
Further, the recovery torque limiting module 30 is further configured to take the input torque of the transmission as the limiting torque of the transmission, and control the input torque of the transmission to change according to a third preset gradient until a preset limiting torque threshold is reached.
Further, the recovery torque limiting module 30 is further configured to control the limiting torque of the transmission to be changed to the initial limiting value according to a fourth preset gradient when the vehicle ends the downshift process.
It should be noted that, the specific implementation of the transmission energy recovery limiting device 100 of the vehicle according to the embodiment of the present invention may be specifically referred to the specific implementation of the transmission energy recovery limiting method of the vehicle according to the embodiment of the present invention, and will not be described herein.
In summary, according to the transmission energy recovery limiting device of the vehicle according to the embodiment of the invention, the acquisition module acquires the input end rotating speed and the working shaft gear of the transmission, the recovery torque determining module determines the available recovery torque of the transmission according to the input end rotating speed and the working shaft gear of the transmission, the recovery torque limiting module determines the driving condition of the vehicle, and the recovery torque limiting module limits the available recovery torque of the transmission according to the driving condition in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission. Therefore, according to the real-time driving condition of the vehicle, the available recovery torque of the transmission is limited in time, so that the driving stability and reliability of the vehicle during sliding and braking are ensured in the process of energy recovery control of the vehicle, and the driving experience of a user is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (9)

1. A transmission energy recovery limiting method for a vehicle, the method comprising the steps of:
acquiring the rotating speed of an input end of a transmission and the gear of a working shaft;
determining available recuperation torque of the transmission based on an input speed of the transmission and a working shaft gear;
determining a driving condition of the vehicle, and limiting the available recovery torque of the transmission according to the driving condition in the process of performing energy recovery control on the vehicle according to the available recovery torque of the transmission;
the limiting the available recovery torque of the transmission according to the driving condition comprises: and when the driving working condition is a throttle releasing working condition in the upshift process, acquiring the input end torque of the transmission and the accelerator pedal opening of the vehicle, determining the limiting torque of the transmission according to the input end torque of the transmission when the accelerator pedal opening of the vehicle is smaller than a preset opening threshold value, and limiting the available recovery torque of the transmission according to the limiting torque of the transmission.
2. The transmission energy recovery limiting method of a vehicle according to claim 1, characterized in that limiting the available recovery torque of the transmission according to the driving conditions includes:
and when the driving condition is a sliding downshift condition, the speed ratio of the transmission is monitored, and the change rate of the available recovery torque of the transmission is limited when the speed ratio of the transmission is changed.
3. The method of limiting transmission energy recovery of a vehicle of claim 1, wherein determining a limiting torque of the transmission from an input torque of the transmission comprises:
and taking the negative value of the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the negative value of the torque at the input end of the transmission to change according to a first preset gradient until a preset limiting torque threshold value is reached.
4. A transmission energy recovery limiting method for a vehicle according to claim 3, wherein the limiting torque of the transmission is controlled to be changed to an initial limiting value according to a second preset gradient when the vehicle ends an upshift process.
5. The transmission energy recovery limiting method of a vehicle according to claim 1, characterized in that limiting the available recovery torque of the transmission according to the driving conditions includes:
and when the driving working condition is a brake pedal working condition in the process of downshifting, acquiring the input end torque of the transmission, the main state of the clutch and the downshift sub-state, and when the main state of the clutch is downshifting and the downshift sub-state is Coasting, determining the limiting torque of the transmission according to the input end torque of the transmission, and limiting the available recovery torque of the transmission according to the limiting torque of the transmission.
6. The method of limiting transmission energy recovery of a vehicle of claim 5, wherein determining a torque limit of the transmission based on an input torque of the transmission comprises:
and taking the torque at the input end of the transmission as the limiting torque of the transmission, and controlling the torque at the input end of the transmission to change according to a third preset gradient until a preset limiting torque threshold value is reached.
7. The transmission energy recovery limiting method of a vehicle according to claim 6, characterized in that the limiting torque of the transmission is controlled to be changed to an initial limiting value according to a fourth preset gradient when the vehicle ends a downshift process.
8. A computer-readable storage medium, characterized in that a transmission energy recovery restriction program of a vehicle is stored thereon, which when executed by a processor implements the transmission energy recovery restriction method of a vehicle according to any one of claims 1-7.
9. A transmission energy recovery limiting device for a vehicle, the device comprising:
the acquisition module is used for acquiring the rotating speed of the input end of the transmission and the gear of the working shaft;
the recovery torque determining module is used for determining available recovery torque of the transmission according to the input end rotating speed and the working shaft gear of the transmission;
the recovery torque limiting module is used for determining the driving condition of the vehicle and limiting the available recovery torque of the transmission according to the driving condition in the process of carrying out energy recovery control on the vehicle according to the available recovery torque of the transmission;
the recovery torque limiting module is further configured to obtain an input end torque of the transmission and an accelerator pedal opening of the vehicle when the driving condition is a throttle condition in an upshift process, determine a limiting torque of the transmission according to the input end torque of the transmission when the accelerator pedal opening of the vehicle is smaller than a preset opening threshold, and limit an available recovery torque of the transmission according to the limiting torque of the transmission.
CN202111274885.0A 2021-10-29 2021-10-29 Method, device and storage medium for limiting energy recovery of transmission of vehicle Active CN113928323B (en)

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JP3892520B2 (en) * 1997-03-04 2007-03-14 富士重工業株式会社 Vehicle deceleration energy recovery device
US8540604B1 (en) * 2012-03-15 2013-09-24 Ford Global Technologies, Llc Transmission control during regenerative braking
JP6384464B2 (en) * 2015-12-14 2018-09-05 トヨタ自動車株式会社 Power transmission control device
CN213799292U (en) * 2020-04-07 2021-07-27 奇瑞商用车（安徽）有限公司 Automobile energy recovery control system
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