Abstract: A vehicle height control device stops the operation of vehicle height adjustment if the vehicle height at a wheel can not be increased to a target value during a height increasing operation within a predetermined time period. Automatic restoration of vehicle height adjustment occurs after a predetermined period if the vehicle height has increased to a height greater than a threshold value. However, if such a detection is not made, vehicle height adjustment is locked up.

Abstract: A rotation angle detecting device, that outputs a position data and a control data, each having a prescribed number of bits, as a serial data. A position-data generating circuit, that includes first detecting circuits, that are turned on or off according to the angle of rotation of a rotary shaft, outputs a position data, having a prescribed number of bits, according to the angle of rotation. A state-data generating circuit, that includes second detecting circuits, that are turned on or off according to the signals from the first detecting circuits, outputs a state data, having a prescribed number of bits, that indicate the states of operation of the first detecting circuits. The state data is transformed to a control data after passing through a data selector and a control code generating circuit. The last bit of the serial data is a parity bit.

Abstract: A rotary actuator is disclosed which changes the angular position of the rotary valve which is used to determine the attenuation presented by a shock absorber. The rotary actuator is disposed within a cylindrical piston rod of the shock absorber, and comprises a power transmission mechanism for driving the rotary valve for rotation between a first and a second position within a given range, a d.c. motor for driving the mechanism, a first stop mechanism for selectively stopping the rotation of the motor at a third position which is situated centrally within the given range, and a solenoid assembly for making the first stop mechanism operative. These components are disposed within the cylindrical piston rod in the sequence named from below to above. The power transmission mechanism includes a second stop mechanism which prevents the rotary valve from rotating outside a first and a second location which determine the given range.