Brake-booster with complementary hydraulic power-assist

Details Brake-booster with complementary hydraulic power-assist Brake-booster with complementary hydraulic power-assist

2006-03-07

2006-03-07

Schwartz, Christopher P. (Department: 3683)

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

Reexamination Certificate

active

07008024

ABSTRACT:
A pneumatic-hydraulic hybrid pneumatic brake booster is improved. Additional hydraulic boosting (19, 20) 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 (50). 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.

REFERENCES:
patent: 5236257 (1993-08-01), Monzaki et al.
patent: 5842751 (1998-12-01), Unterforsthuber
patent: 6398316 (2002-06-01), Mizutani et al.
patent: 6439674 (2002-08-01), Niino
patent: 6460944 (2002-10-01), Isono et al.
patent: 6715846 (2004-04-01), Pueschel et al.
patent: 6739676 (2004-05-01), Isono et al.

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