Hydraulic unit

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2011-03-22

2011-03-22

Torres Williams, Melanie (Department: 3657)

Fluid-pressure and analogous brake systems

With pump

Vacuum

C303S114300, C303S115300

Reexamination Certificate

active

07909413

ABSTRACT:
The brake actuation device of a motor vehicle brake system includes a pneumatic brake booster1, the interior of which is subdivided into at least one vacuum chamber and one working chamber, a master brake cylinder2and a pneumatic motor-and-pump assembly3for providing the vacuum in the vacuum chamber, which has a vacuum pump6and a motor7driving the vacuum pump6. A vacuum level in the vacuum chamber or a difference in pressure between the vacuum chamber and the working chamber is sensed using a sensor9, and the motor-and-pump assembly3is enabled by an electronic control unit12when the vacuum falls below a first defined bottom vacuum level Pe in the vacuum chamber and is disabled when a second defined top vacuum level Pa is reached.The rotational speed np of the motor-and-pump assembly3is controlled depending on driving conditions of the vehicle.

REFERENCES:
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patent: 5918462 (1999-07-01), Mitani
patent: 6301883 (2001-10-01), Fulks et al.
patent: 6324845 (2001-12-01), Fulks et al.
patent: 7475951 (2009-01-01), Ichikawa
patent: 3322176 (1985-01-01), None
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patent: 19929880 (2001-01-01), None
patent: 0999109 (2000-05-01), None
patent: 2804926 (2001-08-01), None
Patent Abstracts of Japan, publication No. JP 59 164252 A, Toyota Motor Corp, date of publication: Sep. 17, 1984.

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