Diagnostic system for pressure switch

Details Diagnostic system for pressure switch Diagnostic system for pressure switch

1996-12-10

1998-05-05

Moulis, Thomas N.

Internal-combustion engines

Means to whirl fluid before, upon, or after entry into...

731181, 12333915, F02D 4500, G01M 900

Patent

active

057461740

ABSTRACT:
A diagnostic system is arranged to detect a malfunction in a pressure switch for sensing a negative pressure in a passage between an actuator and a selector valve for alternately introducing a negative pressure such as an intake manifold vacuum and an atmospheric pressure to the actuator to control the actuator. The diagnostic system has a section for carrying out a diagnostic operation on the pressure switch during engine operation, and a section for carrying out a similar diagnostic operation to check the pressure switch after a stop of the engine while holding a power supply for the diagnosis.

REFERENCES:
patent: 4616615 (1986-10-01), Kawaguchi et al.
patent: 4704996 (1987-11-01), Morikawa
patent: 4750461 (1988-06-01), Hasebe et al.
patent: 5046467 (1991-09-01), Arnold et al.

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