System for diagnosing an internal combustion engine

Measuring and testing – Internal combustion engine or related engine system or... – Compression

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731173, G01M 1500

Patent

active

045274240

ABSTRACT:
A system for diagnosing an internal combustion engine. The system comprises: a control signal generating system for monitoring the operation of the engine, such ignition, and for generating a control signal; a driven system, such as a fuel injection system, operated in dependency on the control signal. A first diagnosis circuit is provided for diagnosis of the operation of the control signal generating system and for producing an output when trouble occurs in the system; and a second diagnosis circuit is provided for diagnosing the operation of the driven system and for producing an output when trouble occurs in the system. Results of diagnosis by the first and second diagnosis circuits are indicated by lamps. A logic gate is provided to be controlled by the output of the first diagnosis circuit so that the lamp for the second diagnosis circuit does not indicate trouble in the driven system.

REFERENCES:
patent: 3919885 (1975-11-01), Kaireit
patent: 3938075 (1976-02-01), Reddy
patent: 4119070 (1978-10-01), Asano
patent: 4219798 (1980-08-01), Frister
patent: 4244340 (1981-01-01), Herth et al.
patent: 4246566 (1981-01-01), Endo et al.

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