Antiskid control system for four-wheel-drive vehicle
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60T-007/12
G06F-007/00
출원번호
US-0166113
(2005-06-27)
우선권정보
JP-2001-235402(2001-08-02)
발명자
/ 주소
Inoue,Gen
Ishikawa,Atsushi
Ohtsu,Nobuyuki
출원인 / 주소
Hitachi, Ltd.
대리인 / 주소
Foley &
인용정보
피인용 횟수 :
3인용 특허 :
13
초록▼
An antiskid control system for a four-wheel-drive vehicle is arranged to calculate a difference between an average of wheel accelerations of front wheels and an average of wheel acceleration of rear wheels. When the difference is greater than or equal to the vibration determination threshold, the an
An antiskid control system for a four-wheel-drive vehicle is arranged to calculate a difference between an average of wheel accelerations of front wheels and an average of wheel acceleration of rear wheels. When the difference is greater than or equal to the vibration determination threshold, the antiskid control system determines that a driveline vibration is generated and executes a control for converging the driveline vibration.
대표청구항▼
What is claimed is: 1. An antiskid control system for a four-wheel-drive vehicle, comprising: a brake hydraulic generator for a braking hydraulic pressure; a braking cylinder attached to each wheel of the four-wheel-drive vehicle, the braking cylinder generating a braking force by receiving the br
What is claimed is: 1. An antiskid control system for a four-wheel-drive vehicle, comprising: a brake hydraulic generator for a braking hydraulic pressure; a braking cylinder attached to each wheel of the four-wheel-drive vehicle, the braking cylinder generating a braking force by receiving the braking hydraulic pressure; a control valve disposed between the brake hydraulic generator and the braking cylinder, the control valve controlling the braking hydraulic pressure between a pressure decreasing control condition of decreasing the hydraulic pressure of the braking cylinder and a pressure increasing control condition of increasing the hydraulic pressure; a wheel speed detector attached to each wheel, the wheel speed detector detecting a wheel speed of each wheel and outputting a wheel speed indicative signal; and a control unit coupled to the control valve and the wheel speed detector, the control unit being arranged, to calculate a target control speed on the basis of the wheel speed of each wheel, to calculate a front wheel acceleration of the front wheel and a rear wheel acceleration of the rear wheel from the respective front and rear wheel speeds, to calculate a difference between the front wheel acceleration and the rear wheel acceleration, to determine that a driveline vibration is generated when the difference is greater than a vibration determination threshold, and to execute a vibration convergence control for converging the driveline vibration when the driveline vibration is generated. 2. The antiskid control system as claimed in claim 1, wherein the vibration determination threshold includes a vibration determination starting threshold for determining a starting point of the vibration convergence control. 3. The antiskid control system as claimed in claim 2, wherein the vibration determination threshold further includes a vibration determination terminating threshold for determining a terminating point of the vibration convergence control. 4. The antiskid control system as claimed in claim 3, wherein the vibration determination starting threshold is greater than a vibration determination terminating threshold. 5. The antiskid control system as claimed in claim 1, wherein the vibration convergence control includes a process for executing the pressure decreasing control for a predetermined time period. 6. The antiskid control system as claimed in claim 5, wherein the vibration convergence control includes a process for prohibiting the pressure increasing control for a predetermined time period after the execution of the pressure decreasing control and for executing the pressure holding control. 7. The antiskid brake control system as claimed in claim 1, wherein the control unit is further arranged to determine that a small vibration is generated when the difference is greater than the small vibration determination threshold, and to execute a small vibration convergence control for converging the small vibration when the small vibration is generated. 8. The antiskid control system as claimed in claim 7, wherein the small vibration convergence control includes a process for prohibiting the pressure increasing control for a predetermined time period. 9. The antiskid control system as claimed in claim 7, wherein the control unit is further arranged to detect the generating condition of the small vibration when the number of times that the difference becomes greater than or equal to the predetermined small vibration determination threshold is continuously counted up to a predetermined number of times. 10. The antiskid control system as claimed in claim 7, wherein the small vibration includes a vibration generated when the vehicle travels a bad road. 11. An antiskid control system for a four-wheel-drive vehicle, comprising: a brake hydraulic generating means for master generating a braking hydraulic pressure; a braking force generating means for generating a braking force by receiving the braking hydraulic pressure, the braking force generating means attached to each wheel of the four-wheel-drive vehicle; a pressure controlling means for controlling a pressure decreasing control condition for decreasing the hydraulic pressure of the braking force generating means and a pressure increasing control condition for increasing the hydraulic pressure; a wheel speed detecting means for detecting a wheel speed of each wheel; a target control speed calculating means for calculating a target control speed on the basis of the wheel speed of each wheel; a wheel acceleration calculating means for calculating and a rear wheel acceleration of the rear wheel from the respective front and rear wheel speeds; a brake hydraulic pressure control means for controlling the switch control device at the pressure decreasing control condition when the wheel speed reaches the target control speed, the brake hydraulic pressure control means controlling the switch control device at the pressure increasing control condition when the wheel acceleration is outside of a range from zero to a predetennined positive value after the execution of the pressure decreasing control; a difference calculating means for calculating a difference between the front wheel acceleration and the rear wheel acceleration; a driveline vibration determining means for determining that a driveline vibration is generated when the difference is greater than a vibration determination threshold; and a vibration convergence executing means for executing a driveline vibration convergence control when the driveline vibration is generated. 12. An antiskid control system for a four-wheel-drive vehicle, the antiskid control system executing an antiskid control of each wheel of the vehicle by controlling a switch control valve disposed between a master cylinder and a wheel cylinder of each wheel of the vehicle, the antiskid control system comprising: a control unit programmed to detect a wheel speed of each wheel, to calculate a target control speed on the basis of the wheel speed of each wheel, to calculate a wheel acceleration of each wheel from the wheel speed, to command the switch control valve to execute a pressure decreasing control of decreasing a hydraulic pressure of the wheel cylinder when the wheel speed reaches the target control speed, to command the switch control valve to execute a pressure increasing control of increasing the hydraulic pressure of the wheel cylinder when the wheel acceleration is smaller than zero or greater than a predetennined positive value after the pressure decreasing control is executed, to calculate an acceleration difference between an average of the wheel accelerations of front wheels and an average of the wheel acceleration of rear wheels, to determine that a driveline vibration is generated when the acceleration difference is greater than or equal to the vibration determination threshold, and to execute a control for converging the driveline vibration when the driveline vibration is generated. 13. The antiskid control system as claimed in claim 11, wherein the driveline vibration is executed by the vibration convergence controlling means only when the acceleration difference is greater than the vibration determination threshold. 14. The antiskid control system as claimed in claim 13, wherein the driveline vibration is halted by the vibration convergence controlling means when the acceleration difference becomes less than a vibration termination threshold, and wherein the vibration termination threshold is slightly less than the vibration determination threshold. 15. The antiskid control system as claimed in claim 12, wherein the driveline vibration converging operation is executed only when the acceleration difference is greater than the vibration determination threshold. 16. The antiskid control system as claimed in claim 15, wherein the control unit further programmed to halt the vibration convergence control when the acceleration difference becomes less than a vibration termination threshold, wherein the vibration termination threshold is slightly less than the vibration determination threshold.
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이 특허에 인용된 특허 (13)
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Yoshiaki Matsuo JP; Kiyotaka Motoyoshi JP, Brake cylinder pressure control apparatus with controller for controlling pressurizing device based on operating state of pressure control valve device.
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Burkhard Dieter,DEX ; Ehmer Norbert,DEX ; Proger Thomas,DEX ; Volz Alexander,DEX ; Kunz Gerhard,DEX ; Fennel Helmut,DEX, Process for monitoring a braking system with antilock system and electronic braking power distribution.
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