Cooling apparatus for internal combustion engine

Details Cooling apparatus for internal combustion engine Cooling apparatus for internal combustion engine

2006-07-28

2008-08-12

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Cooling

Automatic coolant flow control

C123S041100, C236S034500

Reexamination Certificate

active

07409929

ABSTRACT:
A cooling apparatus includes a thermostat that adjusts a feed rate of coolant to a radiator, estimating means that estimates a coolant temperature simulated value at least based on the detection value of an intake-air temperature sensor, and diagnosis means that diagnoses an operating state of the thermostat by comparing the detection value of a coolant temperature sensor, and the coolant temperature simulated value when a diagnosis condition is established. When a ratio of an integrated value of the simulated water temperature variation in an idle state to the integrated value of the simulated water temperature variation in a normal driving state is equal to or greater than an upper limit ratio XP, the diagnosis of the operating state of the thermostat is prohibited.

REFERENCES:
patent: 4271795 (1981-06-01), Nakagawa et al.
patent: 6694246 (2004-02-01), Masuda et al.
patent: 2005/0224019 (2005-10-01), Kim
patent: 2005/0228577 (2005-10-01), Wakahara et al.
patent: 9-68028 (1997-03-01), None
patent: 2000-220456 (2000-08-01), None
patent: 2004-232519 (2004-08-01), None

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