Electricity: motive power systems – Positional servo systems
Patent
1991-07-29
1993-07-06
Ip, Paul
Electricity: motive power systems
Positional servo systems
318434, 318587, 180 791, 180140, B62D 714
Patent
active
052257533
ABSTRACT:
In an electric control apparatus for a four-wheel steering system including an electric motor the rotary angle of which is electrically controlled in accordance with a target steering angle of rear road wheels, and a hydro-mechanical tracer mechanism having a fluid control valve the valve element of which is drivingly connected to the electric motor to be displaced in proportion to the rotary angle of the electric motor, the tracer mechanism being arranged to steer the rear road wheels in proportion to a displacement amount of the valve element, the target steering angle is converted into a control value for rotation of the electric motor, and a drive signal indicative of the control value is applied to the electric motor. The electric control apparatus is designed to greatly change the control value to and from zero when the target steering angle is less than a predetermined small angle and to change the control value in proportion to the target steering angle when the target steering angle is more than the predetermined small angle.
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Ishikawa Masaru
Iwata Hitoshi
Koike Shin
Ohashi Kaoru
Sugiyama Mizuho
Ip Paul
Toyota Jidosha & Kabushiki Kaisha
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