Fail-safety valve unit for a parking brake function and parking brake valve arrangement
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United States of America Patent
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Oct 8, 2024
Grant Date -
Sep 22, 2022
app pub date -
Jun 3, 2022
filing date -
Dec 4, 2019
priority date (Note) -
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Abstract
The disclosure is directed to a fail-safety valve unit for a parking brake function of an electronically controllable pneumatic braking system for a utility vehicle. The fail-safety valve unit has a monostable release valve and a ventilating valve. The release valve, when energized, provides a release pressure at a first release valve port for the parking brake function and, when de-energized, connects the first release valve port to the ventilating valve. The ventilating valve has a nonlinear ventilating characteristic which permits ventilating of the release valve port from the release pressure to a partial brake pressure with a first gradient, and ventilating of the release valve port from the partial brake pressure to a full brake pressure with a second gradient, wherein the first gradient is greater than the second gradient. A parking brake module and a vehicle are part of the disclosure.
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