发明名称 |
Two step park release valve |
摘要 |
A braking system control requires that a first or service braking system be actuated before a second or parking braking system can be released to prevent unexpected movements. A sensor senses that the service brakes are engaged and controls a device to release the parking brakes. A latch ensures that the parking brakes remain released. For example, a piston and check valve form the sensor and latch. Service brake pressure works against the piston. Above a threshold level, service brake pressure drives the piston to open a valve that provides pressurized air to a parking brake release system. Once released, the check valve directs parking brake release pressure to the piston to keep the valve open.
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申请公布号 |
US6729696(B2) |
申请公布日期 |
2004.05.04 |
申请号 |
US20010852232 |
申请日期 |
2001.05.08 |
申请人 |
BENDIX COMMERCIAL VEHICLE SYSTEMS, LLC |
发明人 |
KEMER JOHN J.;MARSH ANDREW |
分类号 |
B60T17/22;F15B20/00;(IPC1-7):B60T13/00 |
主分类号 |
B60T17/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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