Fault detection in cooling system for motor vehicle engine involves comparing variation of actual temperature with two model temperature ranges to determine if fault is in sensor or valve

摘要

The method involves computing a first model temperature range from actual temperature values using an algorithm and detecting faults by comparing with the actual temperature. The computer derives a second temperature range for a second temperature corresponding to an open thermostatic valve, compares the actual temperature variation with the second range and determines whether the sensor or valve is faulty from both comparison results.