In the power control system of fuel vehicle and hybrid vehicle, the water temperature sensor monitors the engine coolant temperature in real time, relying on the assistance of EXSENSE automotive-grade NTC thermistor. The reason why NTC thermistor is used as temperature sensing component for engine coolant temperature monitoring is mainly based on the following considerations:

1. High Temperature Resistance: EXSENSE thermistor can operate stably within typical automotive temperature ranges of −40℃~150℃ (with temperatures up to 180℃ under certain conditions), cover cold start, idling, full load, and heat immersion scenarios, ensuring stable continuous temperature data collection by the water temperature sensor.

2. High Accuracy: Accuracy of EXSENSE automotive-grade NTC achieves can reach ±1%, effectively improving the temperature measurement error of the water temperature sensor and meeting the ECU's demand for precise data judgment. High-accuracy NTC signals enable the ECU to more accurately identify the coolant heating rate during the cold start phase, thereby optimizing enrichment strategies and misfire monitoring thresholds; During the closed-loop heat engine stage, it supports precise control of the thermostat, cooling fan, and thermal management module.

In short, the high-temperature resistance of the EXSENSE water temperature sensor NTC thermistor ensures signal "usability" in harsh environments, while its high accuracy determines the "availability" of the signal in thermal management algorithms. In a typical water temperature sensor structure, the NTC thermistor is placed inside the sealed end at the bottom of the metal housing (usually brass or stainless steel). The NTC and the inner wall of the housing are filled with thermally conductive encapsulating material (such as thermally conductive epoxy resin), and the leads are connected to terminals for an integrated package. During temperature monitoring, coolant heat is conducted through the metal probe wall to the NTC, where the obtained temperature information is converted by the ADC and transmitted to the ECU. The ECU then adjusts control parameters such as injection pulse width, ignition advance angle, and fan duty cycle based on coolant temperature. Thus, although the EXSENSE water temperature sensor NTC thermistor is small, it sits at the very front end of the closed-loop chain of "physical temperature—resistance change—voltage signal—control decision", serving as the foundation for subsequent protection measures.

The importance of EXSENSE automotive-grade NTC thermistor in automotive water temperature sensor lies not in its indispensable temperature sensing component, but in its technical pathway for coolant temperature monitoring: "signal acquisition, error estimation, fault identification". EXSENSE water temperature sensor NTC thermistor serves as a reliable front-end interface for mapping coolant thermal status, providing clear diagnostic criteria for the system, enabling engine thermal management to maintain continuous and effective temperature monitoring even under complex automotive conditions. EXSENSE water temperature sensor NTC thermistor has passed IATF16949 certification and meets the AEC-Q200 testing requirements. We operate strictly according to VDA6.3 standards, providing high-quality NTC products for automotive-grade customers.