Slip control system for motor vehicle
First Claim
1. A slip control system for a motor vehicle, having driving wheels and undriven wheels, which controls slips of the driving wheels comprising:
- means for detecting a slip ratio of each driving wheel;
slip decreasing means for decreasing a slip of each driving wheel by controlling a driving force transmitted to the driving wheel so that the slip ratio of the driving wheel is at least equal to a predetermined desired slip ratio after the slip ratio of the driving wheel reaches a threshold for starting a slip control operation and then becomes greater than the threshold;
yawing rate detecting means for detecting an angular speed at which said vehicle moves around a vertical axis, defining a yawing rate of the vehicle; and
steering amount detecting means for detecting a steering amount of steering wheels of the vehicle;
wherein said slip decreasing means includes correcting means for decreasing the desired slip ratio when the motor vehicle is determined to be in an unstable condition, based on both a comparison between a first predetermined value and the yawing rate detected by the yawing rate detecting means and a comparison between a second predetermined value and the steering amount detected by the steering amount detecting means.
0 Assignments
0 Petitions
Accused Products
Abstract
A slip control system for a motor vehicle controls slippage of driving wheels and includes a sensor for detecting a slip ratio of each driving wheel, a device for decreasing slip of each driving wheel by controlling a driving force transmitted to the driving wheel so that the slip ratio of the driving wheel is at least equal to a predetermined desired slip ratio when the slip ratio of the driving wheel is equal to the desired slip ratio, a sensor for detecting a yawing rate of the vehicle, and a sensor for detecting a steering amount of the vehicle. The slip decreasing device includes a correcting device for decreasing the desired slip ratio when a steering condition is detected based on amounts detected by both the yawing rate detecting sensor and the steering amount detecting sensor.
40 Citations
27 Claims
-
1. A slip control system for a motor vehicle, having driving wheels and undriven wheels, which controls slips of the driving wheels comprising:
-
means for detecting a slip ratio of each driving wheel; slip decreasing means for decreasing a slip of each driving wheel by controlling a driving force transmitted to the driving wheel so that the slip ratio of the driving wheel is at least equal to a predetermined desired slip ratio after the slip ratio of the driving wheel reaches a threshold for starting a slip control operation and then becomes greater than the threshold; yawing rate detecting means for detecting an angular speed at which said vehicle moves around a vertical axis, defining a yawing rate of the vehicle; and steering amount detecting means for detecting a steering amount of steering wheels of the vehicle; wherein said slip decreasing means includes correcting means for decreasing the desired slip ratio when the motor vehicle is determined to be in an unstable condition, based on both a comparison between a first predetermined value and the yawing rate detected by the yawing rate detecting means and a comparison between a second predetermined value and the steering amount detected by the steering amount detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A slip control system for a motor vehicle, having driving wheels and undriven wheels, which controls slips of the driving wheels comprising:
-
means for detecting a slip ratio of each driving wheel; slip decreasing means for decreasing a slip of each driving wheel by controlling a driving force transmitted to the driving wheel so that the slip ratio of the driving wheel is at least equal to a predetermined desired slip ratio after the slip ratio of the driving wheel reaches a threshold for starting a slip control operation and then becomes greater than the threshold; yawing rate detecting means for detecting an angular speed at which said vehicle moves around a vertical axis, defining a yawing rate of the vehicle; and steering amount detecting means for detecting a steering amount of steering wheels of the vehicle; wherein said slip decreasing means includes correcting means for decreasing the desired slip ratio when a steering condition, obtained from both the steering amount detected and the yawing rate detected by the yawing rate detecting means, is in a predetermined range and for not decreasing the desired slip ratio when the steering condition is not in said predetermined range, one of a plurality of corrected slip ratios being a minimum slip ratio when the yawing rate is at least equal to the predetermined value and the steering amount is no more than a second predetermined value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A slip control system for a motor vehicle, having driving wheels and undriven wheels, which controls slips of the driving wheels comprising:
-
means for detecting a slip ratio of each driving wheel; slip decreasing means for decreasing a slip of each driving wheel by controlling a driving force transmitted to the driving wheel so that the slip ratio of the driving wheel is at least equal to a predetermined desired slip ratio after the slip ratio of the driving wheel reaches a threshold for starting a slip control operation and then becomes greater than the threshold; steering amount detecting means for detecting a steering amount of steering wheels of the vehicle; and yawing rate detecting means for detecting an angular speed at which said vehicle moves around a vertical axis, defining a yawing rate of the vehicle; wherein said slip decreasing means includes desired slip ratio determining means for determining the predetermined desired slip ratio so that it is greater when the steering amount is large than when the steering amount is small and (1) said desired slip ratio determining means sets said predetermined desired slip ratio to a first value when said yawing rate detecting means detects a yawing rate which is less than a predetermined yawing rate, (2) said desired slip ratio determining means sets said predetermined desired slip ratio to a second value when said steering amount is no larger than a predetermined steering amount, and (3) said desired slip ratio determining means sets said predetermined desired slip ratio to a third value when said steering amount is larger than said predetermined steering amount. - View Dependent Claims (26, 27)
-
Specification