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Fuel vapor leak test system and method comprising successive series of pulse bursts and pressure measurements between bursts
Fuel vapor leak test system and method comprising successive series of pulse bursts and pressure measurements between bursts
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机译:燃料蒸气泄漏测试系统和方法,包括一系列连续的脉冲突发和突发之间的压力测量
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摘要
A leak test system and method for a motor vehicle fuel system. A pump forces air under pressure into vapor containment space. The pump operates in accordance with steps established by a processor. The pump creates superatmospheric pressure in the space during an initial charging phase step, and after completion of that step, the pump performs a measurement phase step that forces pulses of air into the space in a succession of pulse bursts. Each burst contains a succession of individual pulses, preferably in equal numbers, and each successive burst is delayed from an immediately prior burst by a time interval substantially longer than the time intervals between individual pulses in each burst, preferably by constant time intervals. The processor processes data corresponding to a measurement of pressure in the space after the occurrence of at least one of such bursts and as a result indicates leakage from the space.
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