Malfunction diagnosis device for engine speed controller

Details Malfunction diagnosis device for engine speed controller Malfunction diagnosis device for engine speed controller

1996-12-20

1997-12-30

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 3902

Patent

active

057018669

ABSTRACT:
To appropriately detect malfunction of an air quantity adjusting valve in any type of case, an electronic control type throttle valve is disposed in an air intake pipe of an engine. An ISC valve which is duty controlled by an ECU is disposed in a bypass passage which bypasses the throttle valve. A CPU within the ECU establishes a drive duty ratio of the ISC valve to control engine speed in a target speed region during idling of the engine. Additionally, in a case where the drive duty ratio exceeds a predetermined control range (0 to 100%), the CPU controls idle speed by the throttle valve. Accordingly, in a case where throttle aperture is larger than a predetermined value TAH, or in a case where throttle aperture is smaller than a predetermined value TAL (where TAH>TAL), the CPU determines that an opening side malfunction or a closing side malfunction has occurred in the ISC valve.

REFERENCES:
patent: 4873954 (1989-10-01), Codling
patent: 4960087 (1990-10-01), Junginger et al.
patent: 5031595 (1991-07-01), Heck et al.
patent: 5513610 (1996-05-01), Okamoto et al.
patent: 5622151 (1997-04-01), Lang

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