Abstract: An antitheft apparatus for a motor vehicle can allow operation of an internal combustion engine of a motor vehicle to be started notwithstanding of decision of discrepancy in an engine start enabling signal ascribable to transient error in communication between a code collating means and an engine start decision means. An identification code stored in an engine key (1) is read out upon every starting of operation of the motor vehicle to be collated with a preset identification code to thereby make decision as to whether or not both of the identification codes coincide with each other. Upon decision of coincidence, the identification code as read out is affixed with a rolling code which is updated every time the engine of the motor vehicle is operated, to thereby generate an engine start enabling signal. Means are provided for sending the engine start enabling signal and for generating the rolling code. The rolling code as generated is sent to the rolling code adding means (30b).

Abstract: A failure detecting apparatus for an anti-skid brake control system of a motor vehicle comprises a main microcomputer for generating a hydraulic pressure control signal for controlling an actuator adapted to generate braking efforts to be applied to wheels of the motor vehicle, an auxiliary microcomputer for detecting occurrence of a failure in the main microcomputer on the basis of the hydraulic pressure control signal, a test signal generating means implemented in the main microcomputer or the auxiliary microcomputer to generate a test signal, an anti-skid brake control arithmetic means incorporated in the main microcomputer to generate a hydraulic pressure control signal on the basis of either a wheel speed signal or the test signal, and a hydraulic pressure control signal monitoring means implemented in the auxiliary microcomputer to monitor the hydraulic pressure control signal generated in response to the test signal, to thereby check the validity of the hydraulic pressure control signal.

Abstract: An improved support apparatus such as a suspension apparatus for a vehicle is disclosed which has excellent response characteristics, can save power consumption and has excellent vibration-isolating capacity for isolating the transmission of high-frequency vibrations from a support member such as a road wheel to an object such as the body of a vehicle. To these end, in one embodiment, a linear motor is disposed between the object and the support member for telescopically supporting the object under magnetic effects. A position sensor senses the position of the object relative to a reference position. A low-pass filter filters high-frequency components of the output signal of the position sensor above a prescribed upper frequency limit. Based on the output signals of the position sensor and the low-pass filter, the current supply to the linear motor is controlled in such a manner as to offset a change in the output signal of the low-pass filter.

Abstract: A shock absorber control apparatus which performs a fuzzy inference by use of a predetermined fuzzy rule regarding comfortable ride, steering stability and grounding efficiency corresponding to a detected running condition of a vehicle, thereby setting an optimum damping force. A shock absorber control apparatus which fetches a plurality of specified frequency components from a vertical acceleration signal of a vehicle body so as to perform a fuzzy inference by use of a fuzzy rule corresponding to a quantity of each frequency component, thereby setting an optimum damping force.