Diagnosis method for liquefied petroleum injection fuel pump

Details Diagnosis method for liquefied petroleum injection fuel pump Diagnosis method for liquefied petroleum injection fuel pump

2006-10-31

2006-10-31

McCall, Eric S. (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Compression

Reexamination Certificate

active

07127940

ABSTRACT:
A method for diagnosing a Liquefied Petroleum Injection fuel pump includes the steps of: inputting an engine Revolutions Per Minute (RPM) and a fuel pump Pulse Width Modulation (PWM) signal into an Electronic Control Unit (ECU) of an interface box; determining whether the RPM indicates that the engine is idling; if the engine is not idling, setting a diagnosis time of the PWM signal to a duration longer than the time the engine takes to deactivate after turning off an LPG switch; determining the operation state of the fuel pump by analyzing the PWM signal; and illuminating a warning lamp if the fuel pump is detected to be operating abnormally or a signal line connecting the fuel pump and the interface box is detected to be disconnected.

REFERENCES:
patent: 5092302 (1992-03-01), Mohan
patent: 5740783 (1998-04-01), Learman et al.
patent: 6907775 (2005-06-01), Hosoya
patent: 2001/0013334 (2001-08-01), Tanaka et al.
patent: 2005/0193991 (2005-09-01), Shin
patent: 2005/0193992 (2005-09-01), Shin

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