Robert Boschgmbh

Bosch Corporation

Nicolas Marlhe

Jean-Marc Piel

Christophe Leboube

Etienne Durand

Aleksander Hurwic

Bruno Beylerian

Yannick Nen

Stéphane Gendrinl

A system for simulating brake feel for a vehicle braking installation comprising a hydraulic braking system () and an electric braking system (). This system comprises a first chamber () containing a force transmitting fluid () and in which there slides a hydraulic piston () under the control of a manual braking operating member (), the first chamber () communicating with a second, secondary simulation chamber () via a simulation valve (), the degree of opening of which allows a force to be simulated at the brake pedal.

Brake for a motor vehicle

A vehicle braking assembly comprising a master cylinder () with no central valves, a brake fluid reservoir () mounted separately from the master cylinder (), pumps () for pressurizing the brake fluid and first solenoid valves () in pipes () connecting the brake fluid reservoir () to the inlets of the pumps (). According to the invention, a calibrated orifice () and a nonreturn valve () which are connected in parallel are mounted in these pipes ().

Motor vehicle braking assembly

A braking device for a motor vehicle having a first brake circuit () with a master cylinder () controlled by a brake pedal (), a second brake circuit () with at least one pump () that is controlled by a computer (C), and a pedal travel simulation mechanism (). The simulation mechanism () includes a solenoid valve () that is mounted in a pipe () connected to a hydraulic fluid storage chamber () and controlled by the computer (C) so as to allow the brake fluid to flow toward the chamber () when the second brake circuit () is active and when the driver presses on the brake pedal. The pipe () is also connected to another pipe () in which hydraulic fluid is displaced by a first part () of a control rod connected to the brake pedal () and second part () associated with the master cylinder ().

Braking device for a motor vehicle

A pneumatic-hydraulic hybrid pneumatic brake booster is improved. Additional hydraulic boosting () provided by a hydraulic circuit is provided beyond a saturation point (Psat) in the operation of the pneumatic circuit. Hysteresis-induced instabilities in the pneumatic part of the booster are taken into consideration (). A choice is made to compensate (A) for the shortfall in operation of the pneumatic circuit using the hydraulic circuit. In one example, this correction is afforded via a microprocessor which imposes a corrected process signal. Using this signal, pressure shifts in the pneumatic system are neutralized.

Brake-booster with complementary hydraulic power-assist

The invention relates to a process and a device for determining the instantaneous value of the amplification provided by a pneumatic-assistance servomotor () in a braking device for a motor vehicle, wherein instantaneous values of the relative vacuum level inside the negative-pressure chamber () of the servomotor and of the hydraulic pressure at the exit from the master cylinder () are measured using sensors (and), and wherein output signals provided by said sensors are processed by data-processing means () so as to compute a pressure difference (&#x394;P), proportional to the instantaneous amplification provided by the servomotor and, if required, an instantaneous value of the pressure (Prc) inside the working chamber () of the servomotor.

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Marly la Ville, France

Nicolas Marlhe