Malfunction diagnosis device of an internal combustion engine co

Details Malfunction diagnosis device of an internal combustion engine co Malfunction diagnosis device of an internal combustion engine co

1996-01-29

1998-03-10

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123 4115, 62129, 62133, 290 40A, F02D 4122, F02D 4300, B60H 132

Patent

active

057249415

ABSTRACT:
An air conditioner control unit performs air conditioner malfunction detection when it detects idle control malfunctions no less than three times in the engine control unit. For example, it detects whether an evaporator downstream temperature is within a second predetermined range which is computed based on a theoretical value. If such temperature is not within the second predetermined range, the air conditioner control unit determines that there is a malfunction in the air conditioner. Moreover, if it is determined that there is a malfunction in the air conditioner, the air conditioner control unit determines if such malfunction affects emissions or fuel consumption. Then, based on the result of such determination, the engine control unit executes malfunction display.

REFERENCES:
patent: 4960087 (1990-10-01), Junginger et al.
patent: 5167127 (1992-12-01), Ohtsu
patent: 5172561 (1992-12-01), Hanson et al.
patent: 5347824 (1994-09-01), Kato et al.

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