CN114426015B - Gear shifting control method for hybrid electric vehicle - Google Patents

Gear shifting control method for hybrid electric vehicle Download PDF

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Publication number
CN114426015B
CN114426015B CN202210206109.5A CN202210206109A CN114426015B CN 114426015 B CN114426015 B CN 114426015B CN 202210206109 A CN202210206109 A CN 202210206109A CN 114426015 B CN114426015 B CN 114426015B
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gear shifting
gear
mode
duration
suppression mode
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CN114426015A (en
Inventor
王建波
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Dongfeng Peugeot Citroen Automobile Co Ltd
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Dongfeng Peugeot Citroen Automobile 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/30—Control strategies involving selection of transmission gear ratio
    • 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B60W2520/105—Longitudinal acceleration
    • 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/12—Brake pedal position

Abstract

The invention discloses a gear shifting control method of a hybrid electric vehicle, which is characterized by comprising the following steps of: acquiring a driving mode at the current moment and vehicle operation parameters at the current moment; if the driving mode at the current moment has a gear shifting requirement and the interval duration of the last gear shifting is smaller than the set interval duration, entering a gear shifting inhibition mode, and keeping the current gear unchanged; and when the duration of the gear shifting inhibition mode reaches the second set duration or the difference between the target gear after the first set duration and the gear at the current moment is larger than or equal to the set gear difference, exiting the gear shifting inhibition mode, and permitting gear shifting. The invention can avoid frequent gear shifting in a short time after the driving mode is switched, and avoid unsmooth power output and power loss.

Description

Gear shifting control method for hybrid electric vehicle
Technical Field
The invention relates to the technical field of automobile gear shifting control, in particular to a gear shifting control method of a hybrid electric vehicle.
Background
Modern vehicles will set different driving modes in higher configuration versions to meet the needs of different consumers for driving pleasure. For example, in the sport mode, in order to pursue a strong power feeling of the vehicle, an upshift or downshift shift curve of the vehicle may be different from a general mode, and in the electric mode, the shift curve is formulated in consideration of a torque output characteristic of the motor.
If the driver switches the driving mode, from the sport mode to the general mode or from the general mode to the sport mode during running of the vehicle, the system gear shifting curve definition is also switched along with the driving mode, the current working condition possibly corresponds to different target gears under two different driving styles, and the gear shifting system can generate the requirements of gear shifting up or gear shifting down to match the current driving style. Frequent shifting problems may occur. For example: when a shift has occurred in a time very close before the driving mode is switched; or a short time in the future, an upshift or downshift is required, which immediately follows if a downshift or upshift is currently performed, also resulting in frequent gear shifts. Too rapid gear shifting not only causes frequent gear shifting impact, but also causes unsmooth power output and energy loss.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a gear shifting control method for a hybrid electric vehicle, which can avoid frequent gear shifting in a short time after the driving mode is switched and avoid unsmooth power output and power loss.
In order to achieve the above object, the present invention provides a gear shift control method for a hybrid vehicle, comprising:
acquiring a driving mode at the current moment and vehicle operation parameters at the current moment;
if the driving mode at the current moment has a gear shifting requirement and the interval duration of the last gear shifting is smaller than the set interval duration, entering a gear shifting inhibition mode, keeping the current gear unchanged, and obtaining a target gear after the first set duration according to the predicted vehicle speed after the first set duration and the required torque at the current moment;
and when the duration of the gear shifting inhibition mode reaches the second set duration or the difference between the target gear after the first set duration and the gear at the current moment is larger than or equal to the set gear difference, exiting the gear shifting inhibition mode, and permitting gear shifting.
Further, the driving modes comprise a general mode, a pure electric mode, a sport mode and a four-wheel drive mode, and the gear shifting curves in different driving modes are different.
Further, the vehicle operation parameters include accelerator pedal opening, brake pedal opening, gear, vehicle speed, acceleration.
Further, the method for determining the target gear after the first set time length comprises the steps of obtaining a predicted vehicle speed after the first set time length according to the vehicle speed, the acceleration and the first set time length, obtaining a required torque according to the calibration of the opening degree of the accelerator pedal, and inquiring a gear shifting curve in the current driving mode according to the predicted vehicle speed and the required torque to obtain the target gear after the first set time length.
Further, after entering the gear shifting suppression mode, judging whether the condition of entering the gear shifting suppression mode is met again every third set time length, if yes, keeping the current gear unchanged, and if not, exiting the gear shifting suppression mode, wherein the third set time length is smaller than the second set time length and the first set time length.
Further, the shift suppression mode includes an acceleration upshift suppression mode, and the acceleration upshift suppression mode is entered when the accelerator pedal opening is greater than the accelerator opening setting value, and the current driving mode has an upshift demand, and the last shift interval time is smaller than the set interval time.
Further, the shift suppression mode includes an acceleration and downshift suppression mode, and the acceleration and downshift suppression mode is entered when the accelerator pedal opening is greater than the accelerator opening setting value, and there is a downshift demand in the current driving mode, and the last shift interval time is smaller than the set interval time.
Further, the condition of exiting the upshift downshift suppression mode further includes that the ratio of the actual output power to the maximum output power of the engine and the drive motor is greater than a set ratio, or that the power battery SOC is less than a SOC set value.
Further, the shift suppression mode includes a deceleration upshift suppression mode, and the deceleration upshift suppression mode is entered when the accelerator pedal opening is smaller than the accelerator opening setting value or there is a braking deceleration, and the current driving mode has an upshift demand, and the last shift interval time is smaller than the set interval time.
Further, the shift suppression mode includes a downshift suppression mode, which is entered when the accelerator pedal opening is smaller than the accelerator opening setting value or there is a brake deceleration, and there is a downshift demand in the current driving mode, and the last shift interval time is smaller than the set interval time.
Further, the set interval time is obtained through vehicle speed calibration, when braking energy recovery does not exist, the set interval time is a first set interval time, when braking energy recovery exists, the set interval time is a second set interval time, and when the vehicle speed is greater than the first set vehicle speed, the first set interval time is smaller than the second set interval time.
Further, the condition for exiting the downshift suppression mode further includes a vehicle speed less than a second set vehicle speed or a brake pedal opening greater than the second set brake pedal opening.
The invention has the beneficial effects that: in the acceleration or deceleration process, if the driving mode at the current moment has a gear shifting requirement and the interval duration of the last gear shifting is smaller than the set interval duration, the gear shifting suppression mode is entered, and the current gear is kept unchanged, so that the frequent gear shifting caused by the switching of the driving mode in a short time can be avoided, and the unsmooth power output and the power loss are avoided; when the duration of the shift suppression mode reaches the second set duration or the difference between the target gear after the first set duration and the gear at the current moment is greater than or equal to the set gear difference, the shift suppression mode is exited, and the shift is permitted, so that the shift is permitted preferentially when the shift requirement is more urgent or the shift suppression time is too long.
Drawings
FIG. 1 is a flow chart of a control method of the present invention.
Fig. 2 is a schematic diagram of a shift pattern according to the present invention.
Detailed Description
The following detailed description is presented to provide further details in the context of the claimed subject matter, as will be apparent to those skilled in the art. The scope of the invention is not limited to the specific examples below. It is also within the scope of the invention to include the claims of the present invention as made by those skilled in the art, rather than the following detailed description.
As shown in fig. 1, a gear shift control method of a hybrid electric vehicle includes:
1. the method comprises the steps of obtaining a driving mode at the current moment and vehicle operation parameters at the current moment, wherein the driving mode comprises a general mode, a pure electric mode, a motion mode and a four-wheel drive mode, gear shifting curves in different driving modes are different, and the vehicle operation parameters comprise accelerator pedal opening, brake pedal opening, gear, vehicle speed and acceleration.
The horizontal axis of the gear shifting curve is the vehicle speed, the vertical axis is the required torque, and for example, a 4-gear gearbox, as shown in fig. 2, 3 up and 4 up shift curves, 3 down and 2 down and 1 down shift curves, which are 3 up shift curves, exist respectively, the working condition area between two adjacent up shift curves is the working condition area of a certain gear, for example, the working condition area of 2 gear during up shift operation is between the up shift curves of 1 up and 2 up and 3 down, the working condition area of 3 gear during down shift operation is between the down shift curves of 4 down and 3 down, and as can be seen from fig. 2, the working conditions of the same up shift curve and the same down shift curve are different in different driving modes.
2. If the driving mode at the current moment has a gear shifting requirement and the interval duration of the last gear shifting is smaller than the set interval duration, entering a gear shifting suppression mode, keeping the current gear unchanged, obtaining a target gear after 2000ms according to the predicted vehicle speed after 2000ms and the required torque at the current moment, judging whether the condition of entering the gear shifting suppression mode is met again every 200ms, if so, keeping the current gear unchanged, and if not, exiting the gear shifting suppression mode.
The method for determining the target gear after 2000ms comprises the steps of obtaining a predicted vehicle speed after 2000ms according to the predicted vehicle speed=vehicle speed+acceleration 2000ms, obtaining a required torque according to the calibration of the opening degree of an accelerator pedal, and inquiring a gear shifting curve in a current driving mode according to the predicted vehicle speed and the required torque to obtain the target gear after 2000 ms.
As a preferred embodiment, the shift suppression mode is divided into the following four modes according to the acceleration and deceleration operation of the driver and the shift demand:
2.1 an acceleration upshift suppression mode, and when the accelerator pedal opening is greater than 5%, and the upshift requirement exists in the current driving mode, and the last gear shift interval time is less than 3000ms, entering the acceleration upshift suppression mode.
And when the duration of the acceleration upshift inhibition mode reaches 2000ms or the difference between the target gear after 2000ms and the gear at the current moment is greater than or equal to 2 gears, exiting the acceleration upshift inhibition mode, and permitting gear shifting.
This shift-inhibiting control is to maintain the continuation of the power output during the upshift, and if the upshift is performed 2 times too quickly in a short time, it is actually difficult to reach the power continuous output demand. While setting the exit mechanism to account for future power demands.
2.2 an acceleration downshift suppression mode, and when the accelerator pedal opening is greater than 5%, and the downshift requirement exists in the current driving mode, and the last shift interval time is less than 2000ms, entering the acceleration downshift suppression mode.
And when the target gear after 2000ms is consistent with the gear at the current moment, continuously keeping the current gear unchanged.
And when the duration of the upshift and downshift inhibition mode reaches 3000ms, or the difference between the target gear after 2000ms and the gear at the current moment is more than or equal to 2 gears, or the ratio of the actual output power to the maximum output power of the engine and the driving motor is more than 60%, or the SOC of the power battery is less than 20%, exiting the upshift and downshift inhibition mode, and permitting gear shifting.
Because of the problem of a downshift followed by an upshift or a continuous downshift during acceleration, if a future upshift is predicted to occur soon, the downshift is currently kept as small as possible, otherwise unreasonable control of the upshift upon downshift occurs. A continuous downshift during acceleration may be a driver's urgent need to increase torque, if a downshift is performed too fast for 2 times in a short period of time, it is actually difficult to reach the power-on-demand, and a short-time suppression should be performed, but if a situation occurs in which the engine part torque is used for charging, or the ratio of the actual output power of the engine and the drive motor to the maximum output power is greater than 60%, etc., resulting in that the vehicle does not have sufficient torque reserve and the driver's torque demand is urgent, the downshift demand is indicated to be urgent, and the downshift suppression is immediately released.
2.3 a deceleration upshift inhibition mode, and when the accelerator pedal opening is less than 5% or the brake pedal opening is greater than 5%, and the upshift requirement exists in the current driving mode and the last gear shift interval time is less than the set interval time, entering the deceleration upshift inhibition mode.
The set interval time is obtained through vehicle speed calibration, and is the first set interval time when braking energy recovery does not exist, and the first set interval time is shown in table 1; when braking energy recovery exists, the set interval time is a second set interval time, and as can be seen from the table 2 and the table 1, the first set interval time is smaller than the second set interval time when the vehicle speed is greater than 40 Km/h.
Table 1 first set interval time calibration table
Vehicle speed (Km/h) 0-20 20-40 40-60 >60
First set interval time (ms) 0 200 1000 2000
Table 2 second set interval time calibration table
Vehicle speed (Km/h) 0-20 20-40 40-60 >60
Second set interval time (ms) 0 200 3000 4000
And when the duration of the deceleration upshift inhibition mode reaches 2000ms or the difference between the target gear after 2000ms and the gear at the current moment is greater than or equal to 2 gears, exiting the deceleration upshift inhibition mode, and permitting gear shifting.
The shift interval time is relatively large in relation to the vehicle speed, because the gear hold time is generally long at high speeds and short at low speeds. When the vehicle is under the trend of downshifting as a whole and no braking energy is recovered, the continuous power output requirement is not urgent, the upshift requirement is caused by mode switching, and the gear shifting requirement is controlled to be at a reasonable position from the previous gear shifting and the future predicted gear shifting at the moment. This upshift requirement suppresses the appropriate delay if there is braking energy recovery, maintaining the sustainability of recovery.
2.4 a downshift suppression mode, when the accelerator pedal opening is less than 5% or the brake pedal opening is greater than 5%, and the current driving mode has a downshift demand and the last shift interval time is less than the set interval time, entering a downshift suppression mode, and determining the set interval time in the downshift suppression mode and suppressing in the downshift suppression mode.
And when the duration of the downshift inhibition mode reaches 2000ms or the difference between the target gear after 2000ms and the gear at the current moment is more than or equal to 2 gears, the vehicle speed is less than 25Km/h or the opening degree of a brake pedal is more than 40%, exiting the downshift inhibition mode, and permitting gear shifting.
The downshift control strategy during coasting or deceleration maneuvers is similar to the upshift control strategy, but in heavy braking downshifts and vehicle speed undershifts, the engine is in need of speed control, and therefore it is required that the downshift demand be satisfied preferentially at this time.

Claims (7)

1. A shift control method of a hybrid vehicle, characterized by comprising:
acquiring a driving mode at the current moment and vehicle operation parameters at the current moment;
if the driving mode at the current moment has a gear shifting requirement and the interval duration of the last gear shifting is smaller than the set interval duration, entering a gear shifting inhibition mode, keeping the current gear unchanged, and obtaining a target gear after the first set duration according to the predicted vehicle speed after the first set duration and the required torque at the current moment;
when the duration of the gear shifting inhibition mode reaches a second set duration or the difference between the target gear after the first set duration and the gear at the current moment is greater than or equal to the set gear difference, exiting the gear shifting inhibition mode, and permitting gear shifting;
the gear shifting suppression mode comprises a deceleration upshift suppression mode, and the deceleration upshift suppression mode is entered when the opening of an accelerator pedal is smaller than an accelerator opening set value or braking deceleration exists, upshift requirements exist in the current driving mode, and the last gear shifting interval duration is smaller than a set interval duration;
the gear shifting suppression mode further comprises a gear shifting suppression mode, and the gear shifting suppression mode is entered when the opening of the accelerator pedal is smaller than an accelerator opening set value or braking deceleration exists, the gear shifting requirement exists in the current driving mode, and the last gear shifting interval duration is smaller than a set interval duration;
the set interval time is obtained through vehicle speed calibration, when braking energy is not recovered, the set interval time is a first set interval time, when braking energy is recovered, the set interval time is a second set interval time, and when the vehicle speed is greater than the first set vehicle speed, the first set interval time is smaller than the second set interval time.
2. The shift control method for a hybrid vehicle according to claim 1, characterized in that: after entering the gear shifting suppression mode, judging whether the condition of entering the gear shifting suppression mode is met again every third set time length, if yes, keeping the current gear unchanged, and if not, exiting the gear shifting suppression mode, wherein the third set time length is smaller than the second set time length and the first set time length.
3. The shift control method for a hybrid vehicle according to claim 1, characterized in that: the method for determining the target gear after the first set time length comprises the steps of obtaining a predicted vehicle speed after the first set time length according to the vehicle speed, the acceleration and the first set time length, obtaining a required torque according to the calibration of the opening degree of an accelerator pedal, and inquiring a gear shifting curve in a current driving mode according to the predicted vehicle speed and the required torque to obtain the target gear after the first set time length.
4. The shift control method for a hybrid vehicle according to claim 1, characterized in that: the gear shifting suppression mode comprises an acceleration gear shifting suppression mode, and the acceleration gear shifting suppression mode is entered when the opening of the accelerator pedal is larger than the set value of the opening of the accelerator, the current driving mode has the gear shifting requirement, and the last gear shifting interval duration is smaller than the set interval duration.
5. The shift control method for a hybrid vehicle according to claim 1, characterized in that: the gear shifting suppression mode comprises an acceleration and downshift suppression mode, and the acceleration and downshift suppression mode is entered when the accelerator pedal opening is larger than the accelerator opening set value, the current driving mode has a downshift requirement, and the last gear shifting interval duration is smaller than the set interval duration.
6. The shift control method for a hybrid vehicle according to claim 5, characterized in that: the condition for exiting the upshift downshift suppression mode further includes that the ratio of the actual output power to the maximum output power of the engine and the drive motor is greater than a set ratio or that the power battery SOC is less than a SOC set value.
7. The shift control method for a hybrid vehicle according to claim 1, characterized in that: the condition for exiting the downshift suppression mode further includes the vehicle speed being less than a second set vehicle speed or the brake pedal opening being greater than the second set brake pedal opening.
CN202210206109.5A 2022-02-28 2022-02-28 Gear shifting control method for hybrid electric vehicle Active CN114426015B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012197075A (en) * 2012-04-05 2012-10-18 Nissan Motor Co Ltd Regenerative braking time gear shift control device for automatic transmission for electric vehicle
CN105276156A (en) * 2014-07-09 2016-01-27 上海汽车集团股份有限公司 Method and device for controlling automatic gear shifting of automobile
CN105383490A (en) * 2014-08-26 2016-03-09 福特全球技术公司 Method of transitioning among shift schedules
WO2017186389A1 (en) * 2016-04-28 2017-11-02 Audi Ag Vehicle having an automatic transmission
CN111795145A (en) * 2020-07-24 2020-10-20 盛瑞传动股份有限公司 Automatic transmission abuse mode identification and protection method
JP2021081050A (en) * 2019-11-22 2021-05-27 トヨタ自動車株式会社 Vehicular control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012197075A (en) * 2012-04-05 2012-10-18 Nissan Motor Co Ltd Regenerative braking time gear shift control device for automatic transmission for electric vehicle
CN105276156A (en) * 2014-07-09 2016-01-27 上海汽车集团股份有限公司 Method and device for controlling automatic gear shifting of automobile
CN105383490A (en) * 2014-08-26 2016-03-09 福特全球技术公司 Method of transitioning among shift schedules
WO2017186389A1 (en) * 2016-04-28 2017-11-02 Audi Ag Vehicle having an automatic transmission
JP2021081050A (en) * 2019-11-22 2021-05-27 トヨタ自動車株式会社 Vehicular control apparatus
CN111795145A (en) * 2020-07-24 2020-10-20 盛瑞传动股份有限公司 Automatic transmission abuse mode identification and protection method

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