Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1996-12-26
1997-12-09
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Idle speed control
12333924, F02D 4108
Patent
active
056948972
ABSTRACT:
To provide a water temperature sensor failure detecting device for an idle speed control system of an internal combustion engine which eliminates the need for a bimetallic guard mechanism, an aperture characteristic of an idle control valve (ISCV) when normal becomes a larger degree of opening as coolant water temperature drops, and bypass airflow supplied to an engine is increased. During failure of a water temperature sensor, a duty value for driving the ISCV is set at 50%, the ISCV is opened substantially halfway, and the bypass airflow supplied to the engine is caused to be a neutral flow. In this way, by causing the bypass airflow during failure of the water temperature sensor to be a neutral flow, a worst state of overrun, engine stall and the like can be prevented, and startability when at low temperature and operability after engine warmup can be ensured.
REFERENCES:
patent: 4760824 (1988-08-01), Sakurai
patent: 4887570 (1989-12-01), Meicher
patent: 5003954 (1991-04-01), Yakuwa et al.
patent: 5048483 (1991-09-01), Nakazawa
patent: 5551396 (1996-09-01), Suzuki et al.
Denso Corporation
Wolfe Willis R.
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