KR980001446A - Abnormality detection method of water temperature sensor - Google Patents

Abstract

The present invention relates to a method for detecting an abnormality of an automobile part, and more particularly, to detect an abnormality about a contact failure or an error of a resistance value of a water temperature sensor that detects a temperature of cooling water, and instructs a driver to give a magnetic The present invention relates to a method for detecting an abnormality of a water temperature sensor stored in a diagnostic memory means to provide convenience for repair and replacement.

The present invention sets the temperature change amount at predetermined time intervals in the memory means of the ECU and determines whether the water temperature sensor is abnormal according to the temperature change amount applied from the water temperature sensor after detecting the ignition of the engine. Reliability is provided for self-diagnosis by detecting faults and errors in the sensor's own resistance.

In addition, the present invention stores the test results to be detected in the memory means and at the same time instructs the driver to the error message through the instrument panel provides reliability and convenience in repair replacement.

Description

Abnormality detection method of water temperature sensor

Since this is an open matter, no full text was included.

1 is a block diagram of a configuration of an abnormality detection device for a water temperature sensor according to the present invention.

2 is a flow chart of an embodiment for executing the abnormality detection method of the water temperature sensor in the present invention shown in FIG.

Claims (7)

In the self-diagnosis method of the vehicle, if the ignition of the engine is detected at the same time as the ignition contact of the vehicle in the stopped state, the first reference time set after the start of the counter of the timer means according to the program set in the memory means Determining whether the temperature of the coolant applied through the A / D conversion means is detected to be higher than or equal to the set first reference temperature when the first reference time is detected. And a third step of detecting whether the counter time of the timer means has passed the second reference time set in the memory means when the temperature of the cooling water detected in the second step is equal to or greater than the first reference temperature. And if the counter of the timer means passes the second reference time in the third step, measures the temperature of the coolant applied through the A / D conversion means. And a fourth step of determining whether or not the detected temperature is above a second reference temperature set in the memory means, and a third reference counted by a timer means when a temperature change of the second reference temperature is detected in the fourth step. Detecting a temperature of the cooling water at a time interval to determine whether the change in the third reference temperature per hour is greater than or equal to a range of the third reference temperature set in the memory means, and in the fifth process, If the amount of change is detected within the range of the third reference temperature set in the memory means, it is determined that the water temperature sensor is normal. If the amount of change in the detected temperature is detected beyond the range of the third reference temperature, it is determined that the water temperature sensor is abnormal and outputs an error message. The abnormality detection method of the water temperature sensor, characterized in that it comprises a sixth process. The method of claim 1, wherein if the temperature of the cooling water detected in the second process is determined to be equal to or less than the first reference temperature, the error message is determined by outputting an error message. The method of claim 1, wherein if it is not detected as a temperature change of more than a second reference temperature in the fourth process, an error message is determined by outputting an error message. The water temperature sensor of claim 1, wherein the first reference time set in the memory means is set within 5 minutes of warming up after the ignition of the engine is detected, and the first reference temperature is set within 10 ° C to 15 ° C. Abnormality detection method. The method of claim 1, wherein the second reference time set in the memory means is set to a time 20 minutes after the normal combustion is performed after ignition of the engine, and the second reference temperature is 70 ° C to 80 °, which is an ideal temperature state of the engine. The abnormality detection method of the water temperature sensor characterized by setting to the range of ℃. According to claim 1, wherein the third reference time set in the memory means is set at intervals of 3 minutes to 5 minutes, the third reference temperature range is the absorption of engine heat according to the circulation of the cylinder block and cooling by the blowing fan The abnormality detection method of the water temperature sensor, characterized in that it is set in the range of approximately 15 ℃ to 25 ℃ formed. The method of claim 1, wherein the error message output in the sixth step is displayed through the instrument panel and stored at a designated address of the memory unit. ※ Note: The disclosure is based on the initial application.