Boosted braking system with automatically-controlled reaction
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United States of America Patent
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Sep 14, 1999
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Aug 5, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A boosted braking system for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The master cylinder (200) causes an increase in pressure of brake fluid supplied to at least one wheel brake (300). The pneumatic booster (100) is controlled by the application of an input force (F2) to a control rod (26) to actuate the master cylinder (200). A main hydraulic piston (30) of the master cylinder (200) has a hollow cylinder (32) in which a reaction piston (34) slides in a leaktight and axial direction. The reaction piston (34) receives at least the input force (F2). An elastic member (46) located between the reaction piston (34) and hollow cylinder (32) exerts an elastic force for urging the reaction piston (34) toward the master cylinder (200). The reaction piston (34) delimits within the cylinder a reaction chamber (36) which is isolated from the interior volume (V) of the master cylinder (200). The reaction chamber (34) receives hydraulic pressure supplied by at least one sensor (G,G') sensitive to variations in at least on physical magnitude in response to variation in the input force (F2).
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