Methodology for diagnosing engine cooling system warm-up behavio

Details Methodology for diagnosing engine cooling system warm-up behavio Methodology for diagnosing engine cooling system warm-up behavio

1999-02-16

2000-10-10

McCall, Eric S.

Measuring and testing

Simulating operating condition

Marine

731172, G01M 1500

Patent

active

061289485

ABSTRACT:
A method for monitoring engine coolant warm-up behavior utilizing a model-based algorithm which provides a moving threshold for accumulated air or accumulated fuel entering into the engine. The algorithm allows for coolant temperature monitoring under a wide range of transient and steady state driving conditions while maintaining safeguards that prevent a false detection. The accumulated air (or fuel) delivered to the engine during the warm-up interval is used to represent the total heat generated by the engine during the warm-up interval. A time-varying moving calculated accumulated air threshold is therefore defined which can deliver accurate pass-fail decisions in conjunction with a predetermined target temperature.

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patent: 5553662 (1996-09-01), Longardner et al.
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