Method for detecting leaky injection valves in an internal combu

Details Method for detecting leaky injection valves in an internal combu Method for detecting leaky injection valves in an internal combu

1993-12-20

1995-04-11

Chilcot, Jr., Richard E.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

73 47, G01M 1500

Patent

active

054047501

ABSTRACT:
The invention is directed to a method for detecting leaky injection valves for an internal combustion engine. The method applies for the start operation under pregiven conditions wherein all cylinders are ignited, even those where there is no injection. A measurement of rpm and a monitoring takes place such that an rpm increase is clearly detected. This increase in rpm is caused by an additional firing in one cylinder. This method is processed in the control apparatus of the engine and can be adapted to various requirements and can be run through for each start or only for each m-th start. The activation of the method can be limited to specific engine temperatures or engine temperature curves.

REFERENCES:
patent: 3919885 (1975-11-01), Kaireit
patent: 4499876 (1985-02-01), Yamamoto
patent: 4785771 (1988-11-01), Ibuki et al.
patent: 4791808 (1988-12-01), Lackner et al.
patent: 5117793 (1992-06-01), Taue et al.
"Bosch Kraftfhartechnisches Taschenbuch" 19th edition, 1984, pp. 366 to 373.

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