Concept for a piezoelectric actuator is - assisted anti-lock braking system - brake with a very fast control response with an independent measurement of the instantaneous wheel speed

摘要

The effectiveness of an anti-lock braking system - depends on the time constant of the control response of the brake-force control as well as from the accuracy of the measurement of the vehicle speed relative to the circumferential wheel speed. In this case in this invention it is now proposed, a strong electromechanical piezo actuator, in particular, between the brake piston / brake cylinder and the rear side of the brake lining and these electromechanical brake-force control in the regular feedback loop of a regular purely - hydraulic anti blocking to integrate the brake system, that is to say in the feedback loop which normally only on the hydraulic brake system pressure acts. Furthermore, a laser scanner - velocimetriesystem, it is proposed to provide a more accurate measurement of the vehicle speed and / or of the longitudinal and lateral (drift -) speed of each wheel axle to achieve. Both concepts together should have a time constant of approximately 10 μsec of the feedback, which is much shorter than the currently achievable 10 milliseconds - as a rule, the response time of a purely hydraulic brake force system. This should be an anti-lock braking system - brake make much more efficient and thus a vehicle during an emergency braking much closer to the limit of the elastic wheel slip (widely) holding, where the strongest braking deceleration can be achieved, just before the vehicle goes over into sliding friction - wheel slip / sliding wheel slippage, then the coefficient of friction by the suddenly jumps to the much smaller coefficient of static friction coefficient.