RADIATOR FAILURE DETECTION APPARATUS FOR INTERNAL COMBUSTION ENGINE

• Main Authors: OKI HIDEYUKI, ISOBE TAKASHI
• Format: Patent
• Language: English
• Published: 23.04.2003
• 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

PROBLEM TO BE SOLVED: To accurately detect the failure of a radiator of an internal combustion engine and suppress (prevent) the failure to meet the requirements for performing failure detection if a value detected by an outside air temperature sensor after the start of the engine undergoes a transient decrease due to the emission of heat from within an intake manifold where the sensor is disposed. SOLUTION: An estimated air intake Qaest is calculated (S120) and compared with a predetermined value Qr (S122); if it exceeds the predetermined value Qr, a timer is set at a value tm1 and started to count down (S124). Upon the timer value tm1 reaching zero (S126), a determination is made as to whether or not a decrease in the temperature of outside air is greater than a threshold value (S128); if the answer is affirmative, the bit of a flag F. MONTRM is reset to zero and the requirements for performing the failure detection are determined not to be met (S130); if the answer is negative, subsequent processes are skipped (not determining that the requirements are not met).