| 摘要 |
The invention relates to a process and a device for determining the instantaneous value of the amplification provided by a pneumatic-assistance servomotor ( 14 ) in a braking device for a motor vehicle, wherein instantaneous values of the relative vacuum level inside the negative-pressure chamber ( 24 ) of the servomotor and of the hydraulic pressure at the exit from the master cylinder ( 16 ) are measured using sensors ( 28 and 30 ), and wherein output signals provided by said sensors are processed by data-processing means ( 32 ) so as to compute a pressure difference (DeltaP), proportional to the instantaneous amplification provided by the servomotor and, if required, an instantaneous value of the pressure (Prc) inside the working chamber ( 26 ) of the servomotor.
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