Electronic stability control method for vehicle

Patent metadata

Field	Value
Publication number	US-2021171017-A1
Application number	US-202016907746-A
Country	US
Kind code	A1
Filing date	Jun 22, 2020
Priority date	Dec 5, 2019
Publication date	Jun 10, 2021
Grant date	—

Abstract

The present disclosure provides an electronic stability control method for a vehicle for performing vehicular electronic stability control simply by adjusting driving force and braking power that are generated by a driving device of the vehicle without use of a driving force distributing method between front, rear, left, or right vehicle wheels. To this end, the vehicular electronic stability control method includes determining a vehicular state value indicating a driving state of a vehicle from information collected from the vehicle, comparing the determined vehicle state value with a first reference value, and controlling an operation of a driving device for generating driving force for driving the vehicle by the controller when the vehicle state value is greater than the first reference value to adjust driving force for preventing understeer or oversteer of the vehicle.

First claim

What is claimed is:

1 . An electronic stability control method for a vehicle, the method comprising:
collecting information for determining a vehicle state value while the vehicle travels, by a controller of the vehicle; determining the vehicle state value indicating a driving state of the vehicle from the collected information, by the controller; comparing the determined vehicle state value with a first reference value, by the controller; and when the vehicle state value is greater than the first reference value, controlling an operation of a driving device for generating driving force for driving the vehicle and adjusting driving force for preventing understeer or oversteer of the vehicle, by the controller, wherein the vehicle state value is a yaw rate error or is a slip angle difference value between a front wheel or a rear wheel; and wherein the first reference value is a first error reference value determined by a current vehicle speed by the controller.

2 . The method of claim 1 , wherein the controller performs each operation of the collecting, the determining, the comparing, and the controlling for electronic stability control for the vehicle according to a signal of an input unit when a driver turns on an electronic stability control function through the input unit.

3 . The method of claim 1 , wherein the controller compares the current vehicle speed with a preset reference vehicle speed, and performs subsequent operations including the determining the vehicle state value when determining that the current vehicle speed is greater than the reference vehicle speed.

4 . The method of claim 1 , wherein the vehicle state value is a yaw rate error;
wherein, when the vehicle is a vehicle including one driving device installed therein for applying driving force to the front wheel or the rear wheel, the adjusting the driving force includes reducing driving force generated by the driving device based on the yaw rate error by the controller; wherein, when the vehicle is a 4-wheel drive vehicle having a front wheel driving device and a rear wheel driving device, the adjusting the driving force includes performing distribution of driving force distributed to the front wheel and the rear wheel according to a ratio of normal lad of the front wheel and normal load of the rear wheel, by the controller.

5 . The method of claim 4 , wherein, when the vehicle is a vehicle including one driving device installed therein, the adjusting the driving force includes reducing driving force of the driving device in proportion to an amount by which the yaw rate error is greater than the first error reference value, by the controller.

6 . The method of claim 4 , wherein, when the vehicle is a vehicle including one driving device installed therein, the adjusting the driving force includes:
determining a correction coefficient corresponding to the yaw rate error, by the controller; correcting a driving force command determined from driving information of the vehicle using the determined correction coefficient, by the controller; and outputting the corrected driving force command and controlling an operation of the driving device according to the corrected driving force command, by the controller.

7 . The method of claim 6 , wherein the correction coefficient is preset to a value greater than 0 and smaller than 1 in the controller, and is set to a value that is gradually reduced as the yaw rate error is increased.

8 . The method of claim 4 , further comprising:
comparing the yaw rate error with a second error reference value determined from the current vehicle speed, by the controller; and when the yaw rate error is equal to or greater than the second error reference value, performing control not to apply driving force to all vehicle wheels of the vehicle, by the controller.

9 . The method of claim 1 , wherein the vehicle state value is a slip angle difference value between the front wheel and the rear wheel; and
wherein the controller determines a front wheel slip angle and a rear wheel slip angle from the information collected from the vehicle and then determines a value obtained by subtracting an absolute value of the rear wheel slip angle from an absolute value of the front wheel slip angle, as the slip angle difference value.

10 . The method of claim 9 , wherein, when the slip angle difference value is greater than a first error reference value, if the vehicle is a vehicle including one driving device installed therein for applying driving force to the front wheel or the rear wheel, the adjusting the driving force includes reducing driving force generated by the driving device based on the slip angle difference value, by the controller; and
wherein, when the vehicle is a 4-wheel drive vehicle having a front wheel driving device and a rear wheel driving device, the adjusting the driving force includes reducing front wheel torque and performing additional distribution on rear wheel torque by a reduced amount of the front wheel.

11 . The method of claim 10 , wherein, when the vehicle is a vehicle including one driving device installed therein, the adjusting the driving force includes reducing driving force of the driving device in proportion to an amount by which the slip angle difference value is greater than the first error reference value, by the controller.

12 . The method of claim 10 , wherein, when the vehicle is a vehicle including one driving device installed therein, the adjusting the driving force includes:
determining a correction coefficient corresponding to the slip angle difference value, by the controller; correcting the driving force command determined from the driving information of the vehicle using the determined correction coefficient, by the controller; and outputting the corrected driving force command and controlling an operation of the driving device according to the corrected driving force command, by the controller.

13 . The method of claim 12 , wherein the correction coefficient is preset to a value greater than 0 and smaller than 1 in the controller, and is set to a value that is gradually reduced as the slip angle difference value is increased.

14 . The method of claim 10 , further comprising:
comparing the slip angle difference value with second error reference value determined from the current vehicle speed, by the controller; and when the slip angle difference value is equal to or greater than the second error reference value, performing control not to apply driving force to a driving wheel by the controller if the vehicle is a vehicle including one driving device installed therein, and performing control not to apply driving force to the front wheel by the controller if the vehicle is a 4-wheel drive vehicle.

15 . The method of claim 14 , further comprising:
comparing the slip angle difference value with a third error reference value determined from a current vehicle speed, by the controller; and when the slip angle difference value is greater than the third error reference value, controlling a driving device to perform regenerative brake by the controller when the vehicle is a device including one driving device installed therein, and controlling a rear wheel driving device to perform regenerative brake when the vehicle is a 4-wheel drive vehicle.

16 . The method of claim 9 , comprising:
when the slip angle difference value is equal to or less than a first error reference value, comparing a slip angle difference value obtained by subtracting an absolute value of a front wheel slip angle from an absolute value of a rear wheel slip

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Oh Ji Won
• Eo Jeong Soo

Classifications

• B60W2520/30

  Wheel torque · CPC title

• B60Y2400/82

  Four wheel drive systems · CPC title

• B60W10/119

  including control of all-wheel-driveline means, e.g. transfer gears or clutches for dividing torque between front and rear axle (B60W10/14 takes precedence) · CPC title

• B60W30/045 Primary

  Improving turning performance · CPC title

• B60Y2300/0227

  related to under-steering · CPC title