Brake booster with controlled position

摘要

Braking assistance servomotor including braking control rod (1), a brake assistance control device (2) actuated by the control rod and control rod position Foucalt current sensor (4,6). Sensor is mounted on brake assistance device (2). Has an electric control circuit (4) and excitation winding (5). fixed to control rod, also an assembly (10,15) comprising aluminum parts including cylindrical elements enveloping a braking control rod (1). The assembly includes two different section cylinders partially overlapping (16) each other.. One of the cylindrical pats is fixed to a base part (8) of the rod and the other is fixed to a high part (9) of the rod. An AC source feeds the excitation winding. Braking system including a brake assistance servomotor having a master cylinder receiving assistance from the servomotor and connected to brakes at wheel level. A computer generates control commands to at least an hydraulic pump. The computer receives control rod (1) position data from the sensor (4,6). For an axial position determined from the control rod the computer sends a command to the pump to send a supplementary quantity of hydraulic fluid to the brakes.