Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1985-12-26
1988-03-15
Love, John J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
91375A, 91434, 180143, B62D 508
Patent
active
047306874
ABSTRACT:
A working fluid passage supplying a fixed flow rate is divided into passages so that a flow rate ratio between the two passages is varied by a variable orifice valve based on a detection signal of a physical quantity factor which varies depending on travelling and steering conditions of the vehicle. The working fluid from one of the two passages is supplied to a steering assisting force generating mechanism through a changeover valve which changes over the passages in accordance with a direction of steering torque acting on the input shaft steering the vehicle, to generate the steering assisting force. The working fluid from the other passage is supplied to a steering reaction force generating mechanism through the changeover valve, and by generating the steering reaction force to the input shaft, the steering force is controlled to an adequate condition corresponding to the physical quantity factor. Furthermore, the passage of the variable orifice valve at the side of the steering reaction force generating mechanism is connected to a drain through a changeover valve or a pressure regulating valve to thereby control the steering feeling to a more adequate condition, and at the same time, when the vehicle is travelling at a low speed, the generation of the steering reaction force by the steering reaction force generating mechanism is suppressed, or the steering reaction force of the steering reaction force generating mechanism is maintained at a constant value. Moreover, the steering angle ratio is regulated by rotating the input shaft in the same direction as the steering direction by a steering angle ratio varying mechanism in correspondence with the reaction force of the steering reaction force generating mechanism, and thus optimum steering feeling can be obtained. Further, a change in the exciting current due to an internal resistance change of an electromagnetic solenoid is suppressed by a voltage correction circuit provided in a control unit for controlling the electromagnetic solenoid of the variable orifice valve, and an appropriate steering force can be generated.
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Chikuma Isamu
Eda Hiroshi
Hill Mitchell J.
Love John J.
Nippon Seiko Kabushiki Kaisha
Weintraub Arnold S.
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