Fault Detection Method of Automotive Temperature Sensor
Temperature Sensor failure, the impact of the whole body of the impact of the body may lead to the entire device can not be used normally. We all know that many of the faults on the car can be reflected in the small icon on the dashboard, the fault light is on, it means that a sensor is working, think about if the sensor fails, then the car failure is not Will be projected onto the dashboard, we do not know the car problems, continue to travel, then it is very dangerous. So it is particularly important to check whether the sensor can work properly. Xiaobian today to share with you is the car on the Temperature Sensor fault detection method.
First, multimeter to detect coolant Temperature Sensor method.
First of all, we know that the temperature value of the coolant Temperature Sensor is inversely proportional to the level of temperature. Turn off the ignition switch, remove the sensor connector, use the car dedicated multimeter Rx1 block, test the resistance of the two terminals of the sensor. Numerical reference to specific models.
You can also remove the sensor, with hot water for multimeter measurement, the same principle.
Second, the coolant Temperature Sensor output signal voltage check.
Install the coolant Temperature Sensor and insert the sensor connector. When the ignition switch is placed in the ON position, measure the output voltage between the connector "THW" terminal (Toyota truck) or the ECU connector "THW" terminal and E2 in Figure 1. The measured voltage should be inversely proportional to the temperature of the coolant. Remove the coolant Temperature Sensor harness connector, turn on the ignition switch, measure the cooling Temperature Sensor supply voltage should be 5V.
Third, the coolant Temperature Sensor and ECU connection line resistance check.
Measure the resistance value of the two-wire connection between the coolant Temperature Sensor and the ECU (the resistance value between the sensor signal terminal and the ground terminal and the corresponding terminal of the corresponding ECU), and the line should be turned on. If the line is not conducting or the resistance value is greater than the specified value, then the sensor harness break or connector connector bad contact, should be further checked or replaced.
Digital Temperature Sensor, as the name suggests can be directly read the digital Temperature Sensor. Through the Temperature Sensor and the corresponding circuit to the physical temperature of the object into a convenient computer, pic, intelligent instruments and other data acquisition equipment can directly read the digital equipment. Usually this type of sensor is integrated temperature and humidity as a whole is the temperature and humidity sensor. Color measurement and measurement is the digital Temperature Sensor of the two performance, the following we briefly introduce these two performance.
Digital Temperature Sensor in the noise environment is more difficult to use. The coupling of the noise to the sensor circuit results in an error in the measured value of the sensor, and even the noise environment can be completely submerged in temperature measurement, resulting in no value in the measured value. Through the study of the photoelectric conversion characteristics of silicon photovoltaic cells with the temperature changes in the law, the design of the use of digital Temperature Sensor DSl8820 a V-T curve control compensation method, the color measurement system to make appropriate voltage compensation to achieve better Performance. The digital Temperature Sensor is used to track the real-time temperature, analyze the linear relationship between the temperature and the measured voltage, obtain the temperature compensation coefficient, and compensate the color measurement system by software. When the Temperature Sensor is introduced, the colorimetric color difference AE of the color measurement system is less than 0.15. This result is fully compliant with the requirements, and is practical in practical applications.