Abstract: The present invention is directed to a vehicle motion control system, which includes wheel brake cylinders, an automatic hydraulic pressure generating apparatus for generating a hydraulic braking pressure irrespective of operation of a brake pedal, a hydraulic pressure control valve device disposed between the pressure generating apparatus and the wheel brake cylinders to control the hydraulic braking pressure in each wheel brake cylinder, and a controller for controlling the pressure generating apparatus and the valve device in response to conditions of vehicle motion, and performing an automatically pressurizing control to the wheel brake cylinders at least when a brake pedal is not depressed, to perform a vehicle motion control.

Abstract: A device for calibrating a neutral point of a longitudinal acceleration sensor of a vehicle, having a detector for detecting that the vehicle is running at a speed higher than a predetermined threshold speed, a detector for detecting that the vehicle is not braked beyond a predetermined threshold braking, a detector for detecting that the vehicle is not driven beyond a predetermined threshold traction, and a detector for detecting output of the longitudinal acceleration sensor to provide a deflection of its neutral point when the running detector is detecting that the vehicle is running at a speed higher than the predetermined threshold speed, the braking detector is detecting that the vehicle is not braked beyond the predetermined threshold braking, and the traction detector is detecting that the vehicle is not driven beyond the predetermined traction, respectively.

Abstract: An anti-lock braking-pressure control apparatus for a vehicle having a plurality of wheels, including at least one wheel speed sensor which detects respective actual speeds of the wheels of the vehicle, at least one solenoid-operated valve which regulates respective braking pressures applied to the wheels, a ground-speed sensor which detects a ground-speed of the vehicle as a running speed thereof relative to a road surface, and a controller which electrically operates, for preventing locking of each of the wheels, a corresponding one of the one or more solenoid-operated valves at a controlled duty cycle, the controller selecting one of a plurality of duty-cycle determining rules, and determining the duty cycle of the corresponding one solenoid-operated valve according to the selected one duty-cycle determining rule, the plurality of duty-cycle determining rules comprising (A) a first determining rule wherein the duty cycle is determined based on both (a) a wheel speed error that is a deviation of the actual