Vehicle steering system
First Claim
1. A vehicle steering system, comprising:
- manual steering means including a steering wheel for manually steering steerable wheels of a vehicle;
power means for applying a steering torque to said steerable wheels; and
control means for controlling said steering torque produced by said power means according to a value indicating a lateral dynamic behavior of said vehicle so as to control said lateral dynamic behavior of said vehicle against external disturbances;
said lateral dynamic behavior including at least one of a yaw rate and a lateral acceleration of said vehicle, and said steering torque being given by a mathematical function including a sum of a first term consisting of a product of said value indicating a lateral dynamic behavior of said vehicle and a first coefficient, and a second term consisting of a product of an angular speed of said steering wheel and a second coefficient.
1 Assignment
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Accused Products
Abstract
Provided is a vehicle steering system which can substantially stabilize the lateral dynamic behavior of a vehicle with a simple control logic over the entire range of the vehicle speed. A steering torque proportional to a yaw rate and/or a lateral acceleration of the vehicle is applied to the steerable wheels to counteract a lateral deviation of the vehicle. To avoid the oscillatory or overshooting behavior of the control system, a damping torque is applied to the steering wheel. Thus, the counteracting steering torque is given as a mathematical function including a sum of a first term consisting of a product of a yaw rate and/or the lateral acceleration of the vehicle and a first coefficient, and a second term consisting of a product of an angular speed of the steering wheel and a second coefficient. In particular, the first coefficient and second coefficient are variable in a mutually proportional relationship so that the optimum selection of the first and second conditions can be done without any complication.
41 Citations
8 Claims
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1. A vehicle steering system, comprising:
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manual steering means including a steering wheel for manually steering steerable wheels of a vehicle; power means for applying a steering torque to said steerable wheels; and control means for controlling said steering torque produced by said power means according to a value indicating a lateral dynamic behavior of said vehicle so as to control said lateral dynamic behavior of said vehicle against external disturbances; said lateral dynamic behavior including at least one of a yaw rate and a lateral acceleration of said vehicle, and said steering torque being given by a mathematical function including a sum of a first term consisting of a product of said value indicating a lateral dynamic behavior of said vehicle and a first coefficient, and a second term consisting of a product of an angular speed of said steering wheel and a second coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification