Abstract: A vibration damping system for a vehicle includes a vibration sensor which detects vibration of a predetermined vibrating element on the vehicle, a vibrator which vibrates the vibrating element, and a drive control unit which controls the vibrator on the basis of the detecting signal from the vibration sensor so that a predetermined object vibration component of the vibration of the vibrating element is damped by the vibration generated by the vibrator. The drive control unit is restrained from controlling the vibrator according to the condition of a predetermined factor of the vehicle.

Abstract: A vibration damping system for a vehicle includes a vibration sensor which detects vibration of a particular vibrating element, an actuator which applies vibration to the particular vibrating element and a controller which receives a vibration signal output from the vibration sensor and controls the actuator to apply to the particular vibrating element such vibration that damps the vibration detected by the vibration sensor. The controller is provided with a sensitivity changing circuit which changes the sensitivity of the vibration sensor according to a predetermined condition of the vehicle.

Abstract: A vibration damping system for a vehicle has a vibration sensor which detects vibration of solid elements on the vehicle and vibration of air inside the vehicle. A first vibrator supports a power unit relative to the vehicle body and directly vibrates the vehicle body. A second vibrator directly vibrates air inside the vehicle body. A drive control unit performs calculation on the basis of a detecting signal from the vibration sensor and controls the first and the second vibrators on the basis of the result of the calculation so that the vibration of the solid element and the vibration of air inside the vehicle body are damped. The vibrator control ratio of the first and second vibrators is changed according to the condition of a predetermined factor of the vehicle.

Abstract: A first control device regarding a running stability of a vehicle, such as an anti-skid braking system, a four wheel steering system, a four wheel driving device and a second control device for automatically avoiding the vehicle from being in a dangerous state, such as an automatic braking device, an automatic steering device are provided. Further provided is a fail judging device for judging a fail time when the first control device improperly works. The control for avoiding a danger by the second control device is restricted when the fail judging device judges the fail time of the first control device. Thereby, when the first control device fails, measures to automatically avoid the danger independent of a driver's intention by such as an automatic braking, an automatic steering, is not taken. This previously prevents the vehicle from being unstable.