System for detecting malfunction of internal combustion engine radiator

• Main Authors: OKI HIDEYUKI, ISOBE TAKASHI
• Format: Patent
• Language: English
• Published: 17.04.2003
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; PHYSICS; STEAM ENGINES; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

A system for discriminating malfunction of a radiator of an internal combustion engine, in which conditions for execution of malfunction discrimination of the radiator are decided to be established, when a decline amount of outside air temperature is less than a threshold value, and the malfunction discrimination is conducted by comparing an estimated and detected coolant temperatures with predetermined values. In the system, making the decision that the conditions are not established is prevented, utilizing a parameter related to a quantity of intake air. With this, it becomes possible to inhibit decisions finding that the conditions are not established in certain cases in which such a decision would ordinarily be unreasonably made, such as when the internal combustion engine is started while still insufficiently soaked, etc., so that heat in the intake manifold installed with the outside air temperature sensor causes a transient or momentary decline in the outside air temperature sensor detection value during high-load operation immediately after engine starting.