Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1985-09-06
1987-09-08
Love, John J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
B62D 508
Patent
active
046917969
ABSTRACT:
A control apparatus for a power-assisted steering system includes a first sensor arranged to produce output signals respectively indicative of rotary angle and rotational speed of a steering shaft, a second sensor arranged to produce an output signal indicative of the vehicle speed, a first control valve arranged to control the quantity of fluid under pressure supplied through a servo valve into a hydraulic power cylinder from a hydraulic pressure source, a second control valve disposed within a bypass passage for providing bypass flow of fluid passing therethrough from the pressure source to a reservoir, and an electric control apparatus arranged to activate the first control valve in response to the output signals from the sensors in such a manner that the quantity of fluid under pressure supplied into the power cylinder is decreased in accordance with increase of the vehicle speed and increased in accordance with increase of the rotational speed of the steering shaft and being further arranged to activate the second control valve in response to the output signals from the second sensor in such a manner that the opening degree of the second control valve is increased in accordance with increase of the rotary angle of the steering shaft and decreased in accordance with increase of the rotational speed of the steering shaft.
REFERENCES:
patent: 4453615 (1984-06-01), Kanazawa et al.
patent: 4476529 (1984-10-01), Nakamura et al.
patent: 4513835 (1985-04-01), Fukino et al.
Hasegawa Akira
Mori Yutaka
Oono Akihiro
Tanooka Shigeo
Love John J.
Toyota Jidosha & Kabushiki Kaisha
Watts Charles R.
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