Vehicle steering system, vehicle including the same and...

Details Vehicle steering system, vehicle including the same and... Vehicle steering system, vehicle including the same and...

2007-11-13

2010-11-16

Winner, Tony H. (Department: 3611)

Motor vehicles

Steering gear

C180S402000, C180S404000, C180S405000, C180S407000, C701S041000, C701S042000, C701S043000

Reexamination Certificate

active

07832522

ABSTRACT:
A vehicle steering system includes a steering wheel, a steering angle detector that detects a steering angle of the steering wheel, a steering angular speed calculator that calculates a steering angular speed of the steering wheel, a vehicle speed detector that detects a vehicle speed, a target rudder angle finding device, a modifying device, and an actuator. The target rudder angle finding device finds a target rudder angle based on the steering angle, the steering angular speed and the vehicle speed. The target rudder angle is a sum of a proportional term proportional to the steering angle and a differential term proportional to the steering angular speed. The modifying device modifies the differential term when the steering angular speed is negative to reduce a value of the differential term from that when positive. The actuator turns at least one wheel of the vehicle in accordance with the target rudder angle.

REFERENCES:
patent: 5732371 (1998-03-01), Fujita
patent: 6871717 (2005-03-01), Kada
patent: 2005-029016 (2005-02-01), None

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