METHOD FOR ESTIMATING THE PRESSURE IN A VACUUM RESERVOIR OF A BRAKE SERVO

摘要

The invention relates to a method for estimating the pressure (Pass) in a vacuum reservoir (28) of a vacuum brake servo (26) of a motor vehicle (10), the vehicle (10) comprising: - a braking device (16) operated by the pressure (Pmc) of a brake fluid; - a brake servo (26) for amplifying the force of the actuating member (24) using a vaccum supplied by a reservoir (28); - a pressure sensor (23) which is designed to measure the braking pressure (Pmc) of the brake fluid; characterized in that said method comprises: - a first step (E1) of calculating the braking pressure (Pmc); - a second step (E2) of calculating the amplitude (&Dgr;Pmc) of a reduction in braking pressure; - a third step (E3) during which the increase (Conso) of the pressure (Pass) in the vacuum reservoir (28) is estimated as a function of the amplitude (&Dgr;Pmc).