Fiat Societa Per Azioni

Centro Ricerche Fiat S.p.a.

Paolo Vannini

Antonino Bertone

Enrico Rivetti

Gian Paolo Tavoni

A motor vehicle provided with servo-assisted controls for the brakes and steering, has an hydraulic system of the type comprising a volumetric pump the input of which is connected to a reservoir, and first and second distributor devices the first of which is associated with the steering control device and the second of which is associated with the master cylinder for control of the brakes. The said second distributor device is formed in such a way as to function also as a pressure modulating valve.

Motor vehicle hydraulic system

A hydraulic actuator for a motor vehicle anti-skid braking system, in which the static and dynamic parts of the hydraulic circuit are separated, the actuator having a solenoid valve operated by electrical signals generated by sensors when associated wheels of the vehicle reach an incipient skid state; upon operation of the solenoid valve during braking, pressure to one side of a balanced piston is removed so that it moves to close a valve which cuts off braking pressure to the brakes. A throttle passage allows pressure build up to take place until equilibrium is established across said balanced piston allowing braking to recommence after a time delay.

Hydraulic actuator for a motor vehicle anti-skid braking system

A braking device for controlling the torque transmitted to driving wheels via a differential gear, in which the speed and acceleration of each wheel is detected and the appropriate wheel is braked if its speed and/or acceleration exceeds respective predetermined thresholds if the speed and acceleration of the other wheel does not exceed these thresholds; the speed difference is detected between the two wheels for the purpose of controlling, with the speed and acceleration signals, a logic control circuit, preferably a ROM, which determines when the brakes of each wheel are to be applied and released.

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Cambiano, Italy

Paolo Vannini