Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
2007-12-04
2007-12-04
Williams, Thomas (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303SDIG011, C303S113100
Reexamination Certificate
active
11162962
ABSTRACT:
An adaptation to a vehicle antilock braking system modulator to increase the initial displacement of the master cylinder, provide quicker system response and improved pedal feel. A solenoid assembly is added to the non fluid side of each of the low pressure accumulators in the ABS modulator. Upon the operator initiation of a brake apply, the solenoids are energized to immediately push upon the sump pistons and inject fluid from the low pressure accumulators into the brake system. This extra “shot” of fluid decreases the amount of fluid that the master cylinder delivers to the brake system. This improves pedal feel as it reduces the required initial pedal travel for a given brake system displacement. The low pressure accumulator pistons are spring balanced to ensure retention of fluid between brake applies and to allow normal ABS operation. During ABS operation, the low pressure accumulator displacer solenoids are de-energized to allow effective operation. The holding force (electrical current) of the displacer solenoids can be reduced by using a toggle linkage apply mechanism.
REFERENCES:
patent: 5288142 (1994-02-01), Burgdorf
patent: 5411326 (1995-05-01), Linhoff
patent: 6149249 (2000-11-01), Matsuda
patent: 6234128 (2001-05-01), Reuss
McCormick Jr. Leo H.
Robert & Bosch GmbH
Taylor Sarah
Williams Thomas
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