Traction control system for vehicle
First Claim
1. A traction control system for a vehicle which reduces a rate of slip of driving wheels of the vehicle by reducing the driving force transmitted to the road surface from the driving wheels when the driving wheels slip, wherein the improvement comprisesa turning state judging means which judges whether the vehicle is making a turn,an instable state judging means which judges whether the vehicle is in an instable state which occurs when the vehicle is making a turn, anda torque control means which reduces the driving force by a higher rate when the driving wheels slip while the vehicle is making a turn than when the driving wheels slip while the vehicle is running straight, and reduces the driving force by a higher rate when the driving wheels slip while the vehicle is in an instable state and the vehicle making a turn than when the driving wheels slip while the vehicle is not in an instable state and the vehicle is not making a turn and actuation of the driving force reduction is restrained when the vehicle is judged to be in an instable state while the vehicle is judged to be running straight and the reduction of the driving force is not effected, and the driving force reduction is continued when the vehicle is judged to be running straight while the vehicle is judged to be in an instable state and the reduction of the driving force is being effected.
1 Assignment
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Accused Products
Abstract
A traction control system for a vehicle reduces the rate of slip of driving wheels of the vehicle by reducing the traction force transmitted to the road surface from the driving wheels when the driving wheels slip. Whether the vehicle is making a turn is judged, and whether the vehicle is in an instable state which occurs when the vehicle is making a turn. The traction force is reduced by a higher rate when the driving wheels slip while the vehicle is making a turn than when the driving wheels slip while the vehicle is running straight, and the traction force is reduced by a higher rate when the driving wheels slip while the vehicle is in an instable state than when the driving wheels slip while the vehicle is making a turn.
45 Citations
20 Claims
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1. A traction control system for a vehicle which reduces a rate of slip of driving wheels of the vehicle by reducing the driving force transmitted to the road surface from the driving wheels when the driving wheels slip, wherein the improvement comprises
a turning state judging means which judges whether the vehicle is making a turn, an instable state judging means which judges whether the vehicle is in an instable state which occurs when the vehicle is making a turn, and a torque control means which reduces the driving force by a higher rate when the driving wheels slip while the vehicle is making a turn than when the driving wheels slip while the vehicle is running straight, and reduces the driving force by a higher rate when the driving wheels slip while the vehicle is in an instable state and the vehicle making a turn than when the driving wheels slip while the vehicle is not in an instable state and the vehicle is not making a turn and actuation of the driving force reduction is restrained when the vehicle is judged to be in an instable state while the vehicle is judged to be running straight and the reduction of the driving force is not effected, and the driving force reduction is continued when the vehicle is judged to be running straight while the vehicle is judged to be in an instable state and the reduction of the driving force is being effected.
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15. A traction control system for a vehicle which controls a rate of slip of the driving wheels relative to the road surface on the basis of a target rate of slip comprising
a steering angle detecting means which detects the turning angle of a steering wheel of the vehicle, an actual yaw rate detecting means which detects an actual yaw rate actually acting on the vehicle, a reference yaw rate calculating means which calculates a reference yaw rate which is acting on the vehicle, a correcting means which makes an instable-state-based correction to reduce the target rate of slip by a first value when the vehicle is in an instable state where the difference between the actual yaw rate and the reference yaw rate is not smaller than a predetermined value, and a correction limiting means which prevents the correcting means from making the instablestate-based correction when the turning angle of the steering wheel is smaller than a predetermined value even if the difference between the actual yaw rate and the reference yaw rate is not smaller than the predetermined value.
Specification