CN-115534948-B - Vehicle cruise control method, device and system

CN115534948BCN 115534948 BCN115534948 BCN 115534948BCN-115534948-B

Abstract

The invention discloses a vehicle cruise control method, device and system. The method comprises the steps of responding to vehicle cruising restoration operation triggered by a user, obtaining a current running speed and a first transmission gear at the current moment of an automatic transmission, determining current restoration acceleration according to the current running speed and a target cruising speed to be restored, determining first required output torque matched with the first transmission gear, performing iterative adjustment of the transmission gear according to the current restoration acceleration and the first required output torque, determining second required output torque meeting target torque conditions and a second transmission gear corresponding to the second required output torque, and sending the second required output torque and the second transmission gear to an engine controller and a transmission controller to be executed respectively so that the vehicle cruises and accelerates at the current restoration acceleration. According to the technical scheme, smoothness of the vehicle in the cruising acceleration recovery process is improved, and vehicle drivability is greatly improved and enriched.

Inventors

WANG XIAOFENG
CHEN GUODONG
LI YAN
ZHANG XUEFENG
XU JIANNAN
WU GANG
LIU ZHIWEN
WANG HAO

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20221109

Claims (10)

1.A vehicle cruise control method, characterized by being applied to a target controller, comprising: responding to a vehicle cruising recovery operation triggered by a user, and acquiring the current running speed and a first transmission gear of the automatic transmission at the current moment; determining a current recovery acceleration matched with the current running speed according to the current running speed and the target cruising speed to be recovered; determining a first demanded output torque that matches the first transmission gear; Performing iterative adjustment of a transmission gear according to the current recovery acceleration and the first required output torque, and determining a second required output torque meeting a target torque condition and a second transmission gear corresponding to the second required output torque; and respectively transmitting the second required output torque and the second transmission gear to an engine controller and a transmission controller for execution so that the vehicle can cruising and accelerating at the current recovery acceleration.
2. The method of claim 1, wherein determining a current recovery acceleration that matches the current travel speed based on the current travel speed and a target cruise speed to be recovered comprises: acquiring a current driving mode of a vehicle; And determining the current recovery acceleration matched with the current running speed according to the current driving mode, the current running speed and the target cruising speed to be recovered.
3. The method of claim 2, wherein determining a current recovery acceleration that matches the current travel speed based on the current drive mode, the current travel speed, and the target cruise speed to be recovered comprises: determining a target mapping relation between the vehicle speed difference value corresponding to the current driving mode and the acceleration according to the mapping relation between the vehicle speed difference value corresponding to each driving mode and the acceleration; Determining a current vehicle speed difference value between the current running speed and the target cruising vehicle speed to be restored; and determining the current recovery acceleration corresponding to the current vehicle speed difference value according to the target mapping relation between the vehicle speed difference value and the acceleration.
4. The method of claim 1, wherein iteratively adjusting the transmission gear based on the current recovery acceleration and the first required output torque, determining a second required output torque that meets a preset torque condition and a second transmission gear corresponding to the second required output torque, comprises: Determining a target required output torque range corresponding to the current recovery acceleration based on the mapping relation between the recovery acceleration and the required output torque range; taking the first required output torque as a current reference required output torque and taking the current transmission gear as a current reference transmission gear; Detecting whether the current reference demand output torque is within the target demand output torque range; If yes, determining the current reference required output torque as a second required output torque meeting the preset torque condition, and determining the current reference transmission gear as a second transmission gear; And if not, performing gear adjustment on the current reference transmission gear, performing torque update on the current reference required output torque based on the adjusted current reference transmission gear, and returning to execute the operation of detecting whether the current reference required output torque is within the target required output torque range.
5. The method of claim 4, wherein the target desired output torque range includes a maximum desired output torque and a minimum desired output torque; the step adjustment for the current reference transmission step includes: If the current reference required output torque is larger than the maximum target required output torque, performing downshift adjustment on the current reference transmission gear; and if the current reference required output torque is smaller than the minimum target required output torque, performing upshift adjustment on the current reference transmission gear.
6. The method of claim 4, wherein determining a target required output torque range corresponding to the current recovery acceleration based on a correspondence between the recovery acceleration and the required output torque range comprises: Determining a target mapping relation between the recovery acceleration corresponding to the current driving mode and the required output torque range based on the mapping relation between the recovery acceleration corresponding to each driving mode and the required output torque range; and determining a target required output torque range corresponding to the current recovery acceleration based on a target mapping relation between the recovery acceleration and the required output torque range.
7. The method according to any one of claims 1-6, characterized in that during cruising acceleration of the vehicle at a current recovery acceleration, further comprising: receiving a gear shift request sent by the transmission controller, wherein the gear shift request comprises a third transmission gear different from the current transmission gear, the third transmission gear is determined by the transmission controller based on a target virtual accelerator opening sent by the engine controller, and the target virtual accelerator opening is determined by the engine controller based on the second required output torque; determining a third demanded output torque that matches the third transmission gear; And if the third required output torque meets the target torque condition corresponding to the current recovery acceleration, transmitting the allowable gear switching information to the transmission controller for execution, and transmitting the third required output torque to the engine controller for execution, so that the vehicle cruises and accelerates at the current recovery acceleration.
8. The method according to any one of claims 1-6, characterized in that during cruising acceleration of the vehicle at a current recovery acceleration, further comprising: If the fourth required output torque which is sent currently and recently does not meet the target torque condition corresponding to the current recovery acceleration is detected, performing iterative adjustment of the transmission gear based on the current recovery acceleration and the fourth required output torque, and determining a fifth required output torque meeting the target torque condition and a fifth transmission gear corresponding to the fifth required output torque; and respectively transmitting the fifth required output torque and the fifth transmission gear to an engine controller and a transmission controller for execution so that the vehicle can cruising and accelerating at the current recovery acceleration.
9. A vehicle cruise control apparatus characterized by comprising: The first gear acquisition module is used for responding to the vehicle cruising and recovering operation triggered by a user to acquire the current running speed and the first transmission gear of the automatic transmission at the current moment; the acceleration determining module is used for determining the current recovery acceleration matched with the current running speed according to the current running speed and the target cruising speed to be recovered; an output torque determination module for determining a first demanded output torque that matches the first transmission gear; The second gear determining module is used for carrying out iterative adjustment on the gear of the transmission according to the current recovery acceleration and the first required output torque, and determining a second required output torque meeting a target torque condition and a second gear of the transmission corresponding to the second required output torque; and the cruise acceleration module is used for respectively sending the second required output torque and the second transmission gear to an engine controller and a transmission controller to be executed so that the vehicle can perform cruise acceleration at the current recovery acceleration.
10. A vehicle cruise control system, the system comprising a target controller, an engine controller, and a transmission controller: Wherein the target controller is adapted to implement the vehicle cruise control method according to any one of claims 1-8.

Description

Vehicle cruise control method, device and system Technical Field The present invention relates to the field of vehicle control technologies, and in particular, to a vehicle cruise control method, device and system. Background With the development of passenger car technology, constant-speed cruising basically becomes standard. When the driver is in braking deceleration in emergency during constant-speed cruising, the driver wants to accelerate to the previous cruising speed again, and only the 'resume' button is pressed. In actual use, in the cruising recovery initial stage, because the target acceleration is larger and the current transmission gear is higher, the output virtual throttle value is also larger, so that the transmission is triggered to perform a multi-gear power downshift operation, the transmission speed ratio is greatly increased after the downshift, the converted engine output torque is greatly reduced under the same target acceleration, the virtual throttle opening is also rapidly reduced, and the transmission is triggered to perform upshift at the moment, so that all the related parameters can reciprocally fluctuate, the transmission gear is frequently switched and even the vehicle is in a pause state, the smoothness of the acceleration process is influenced, and serious drivability problems are caused. Disclosure of Invention The invention provides a vehicle cruise control method, a vehicle cruise control device and a vehicle cruise control system, which are used for improving smoothness of a vehicle in a cruise acceleration recovery process and improving and enriching vehicle drivability. In a first aspect, the present invention provides a vehicle cruise control method, the method comprising: responding to a vehicle cruising recovery operation triggered by a user, and acquiring the current running speed and a first transmission gear of the automatic transmission at the current moment; determining a current recovery acceleration matched with the current running speed according to the current running speed and the target cruising speed to be recovered; Determining a first demanded output torque that matches a first transmission gear; Performing iterative adjustment of a transmission gear according to the current recovery acceleration and the first required output torque, and determining a second required output torque meeting a target torque condition and a second transmission gear corresponding to the second required output torque; The second required output torque and the second transmission gear are sent to the engine controller and the transmission controller, respectively, for execution to cause the vehicle to cruise acceleration at the current recovery acceleration. In a second aspect, the present invention provides a vehicle cruise control apparatus comprising: The first gear acquisition module is used for responding to the vehicle cruising and recovering operation triggered by a user to acquire the current running speed and the first transmission gear of the automatic transmission at the current moment; the acceleration determining module is used for determining the current recovery acceleration matched with the current running speed according to the current running speed and the target cruising speed to be recovered; an output torque determination module for determining a first demanded output torque that matches a first transmission gear; the second gear determining module is used for performing iterative adjustment on the gear of the transmission according to the current recovery acceleration and the first required output torque, and determining a second required output torque meeting the target torque condition and a second gear of the transmission corresponding to the second required output torque; And the cruise acceleration module is used for respectively sending the second required output torque and the second transmission gear to the engine controller and the transmission controller to be executed so that the vehicle can perform cruise acceleration at the current recovery acceleration. In a third aspect, the disclosed embodiments also provide a vehicle cruise control system, the system comprising a target controller, an engine controller, and a transmission controller: wherein the target controller is for implementing a vehicle cruise control method according to any one of the embodiments of the present disclosure. According to the technical scheme, a first transmission gear under the current running speed and the current moment of an automatic transmission is obtained through responding to a vehicle cruise restoration operation triggered by a user, current restoration acceleration matched with the current running speed is determined according to the current running speed and a target cruise speed to be restored, first required output torque matched with the first transmission gear is determined, iterative adjustment of the transmission gear is carried out according to the