Slip control system for vehicle
First Claim
1. A total slip control system for a vehicle having an engine and a brake for a driving wheel comprisingan engine output control means which controls the output torque of the engine,a brake control means which controls the brake for the driving wheel, anda control unit which, when the driving slip ratio of the driving wheel exceeds a predetermined driving slip ratio, causes the engine output control means to control the output torque of the engine so that the driving slip ratio of the driving wheel converges on a target driving slip ratio, thereby effecting traction control, and, when the braking slip ratio of the driving wheel exceeds a predetermined braking slip ratio, causes the brake control means to apply the brake to the driving wheel and to control the braking pressure so that the braking slip ratio of the driving wheel converges on a target braking slip ratio, thereby effecting anti-skid control,wherein the improvement comprises thatsaid control unit interrupts the traction control and initiates the anti-skid control when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in a high vehicle speed range not lower than a predetermined speed and said control unit initiates the anti-skid control with the traction control continued when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in the low vehicle speed range lower than the predetermined speed.
1 Assignment
0 Petitions
Accused Products
Abstract
A total slip control system for a vehicle effects both the traction control and the anti-skid control. The traction control is effected by control of the engine output torque and application of brake to the driving wheel. The traction control is completely interrupted and the anti-skid control is initiated when the anti-skid control initiating condition is satisfied during the traction control in a high vehicle speed range lower than a predetermined value and the traction control by application of brake is interrupted with the traction control by control of the engine output torque continued and the anti-skid control is initiated when the anti-skid control initiating condition is satisfied during the traction control in a low vehicle speed range lower than the predetermined value.
25 Citations
6 Claims
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1. A total slip control system for a vehicle having an engine and a brake for a driving wheel comprising
an engine output control means which controls the output torque of the engine, a brake control means which controls the brake for the driving wheel, and a control unit which, when the driving slip ratio of the driving wheel exceeds a predetermined driving slip ratio, causes the engine output control means to control the output torque of the engine so that the driving slip ratio of the driving wheel converges on a target driving slip ratio, thereby effecting traction control, and, when the braking slip ratio of the driving wheel exceeds a predetermined braking slip ratio, causes the brake control means to apply the brake to the driving wheel and to control the braking pressure so that the braking slip ratio of the driving wheel converges on a target braking slip ratio, thereby effecting anti-skid control, wherein the improvement comprises that said control unit interrupts the traction control and initiates the anti-skid control when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in a high vehicle speed range not lower than a predetermined speed and said control unit initiates the anti-skid control with the traction control continued when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in the low vehicle speed range lower than the predetermined speed.
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4. A total slip control system for a vehicle having an engine and a brake for a driving wheel comprising
an engine output control means which controls the output torque of the engine, a brake control means which controls the brake for the driving wheel, and a control unit which, when the driving slip ratio of the driving wheel exceeds a predetermined driving slip ratio, causes the engine output control means to control the output torque of the engine and/or the brake control means to apply the brake so that the driving slip ratio of the driving wheel converges on a target driving slip ratio, thereby effecting traction control, and, when the braking slip ratio of the driving wheel exceeds a predetermined braking slip ratio, causes the brake control means to apply the brake to the driving wheel and to control the braking pressure so that the braking slip ratio of the driving wheel converges on a target braking slip ratio, thereby effecting anti-skid control, wherein the improvement comprises that said control unit interrupts the traction control and initiates the anti-skid control when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in a high vehicle speed range not lower than a predetermined speed and said control unit initiates the anti-skid control with the traction control by application of the brake interrupted and the traction control by control of the engine output torque continued when the braking slip ratio of the driving wheel exceeds said predetermined braking slip ratio during the traction control in the low vehicle speed range lower than the predetermined speed.
Specification