High‑voltage / Low‑pressure Sensor, monitors pressure of refrigerant, coolant and brake circuits. High‑pressure variants are used for new‑energy high‑voltage system monitoring.
Automotive high and low pressure sensors are key electronic sensing components for vehicle fluid loop and high-voltage system monitoring. They are responsible for real-time pressure detection of refrigerant, coolant and brake medium, and provide accurate pressure data for vehicle electronic control system. With the popularization of new energy vehicles, high-pressure sensors have become essential safety monitoring components for high-voltage thermal management and refrigeration systems, undertaking system overpressure protection and fault early warning functions.
Top 10 Global Brands
Bosch, Continental, DENSO, Honeywell, TE Connectivity, Infineon, NTK, Murata, Amphenol, SEIKO. These international brands have leading technology in automotive pressure sensing chip design, temperature compensation algorithm and high-pressure sealing structure, providing high-reliability sensing products for global vehicle safety and thermal management systems.
Top 10 Chinese Brands
Minxin Co., Ltd, Huade Electronics, Hanwei Technology, Ruisi Sensing, Dongfeng Electronics, Hangyu Technology, Siruipu, Srisri, Huagong Technology, Jingchuang Electronics. Domestic pressure sensor manufacturers have realized technical breakthroughs in automotive-grade high and low pressure sensing, completing large-scale matching with domestic new energy vehicle OEMs.
Structural Composition
The automotive pressure sensor adopts piezoresistive sensing principle. The core structure includes pressure sensing diaphragm, high-precision sensing chip, ASIC signal processing circuit, pressure-resistant sealed shell, temperature compensation module and waterproof vehicle connector. Low-pressure sensors are designed for conventional refrigerant, coolant and brake circuit working conditions with low medium pressure. High-pressure sensors adopt reinforced pressure-bearing structure and high-insulation design, which are specially adapted to high-pressure working scenarios of new energy vehicle thermal management and refrigeration systems, with stronger pressure resistance and safety performance.
Application
The sensor monitors pressure of refrigerant, coolant and brake circuits. Low-pressure products are widely used in traditional vehicle fluid loop monitoring. High-pressure variants are specially used for new energy high-voltage system pressure monitoring. It converts pressure physical signals into standard electrical signals and feeds them back to ECU and VCU, realizing intelligent monitoring, overpressure early warning, overload protection and closed-loop regulation of vehicle fluid circuits and high-voltage systems.
Manufacturing Challenges
High-pressure sensors face strict structural strength and sealing challenges to avoid high-pressure leakage and blasting risks. The sensing chip needs precise pressure acquisition accuracy and professional temperature compensation algorithm to eliminate temperature drift errors under wide temperature conditions. Different structural designs are required for high and low pressure working conditions to adapt to different medium corrosion characteristics. Weak pressure signals need professional amplification and EMC anti-interference processing to prevent data distortion caused by vehicle electromagnetic noise. Long-term pressure cycle fatigue durability is also a key difficulty in mass production.
Required Quality Documents
IATF16949 quality system certification, APQP project development documents, DFMEA and PFMEA risk analysis reports, production control plan, complete PPAP certification files, pressure accuracy calibration report, burst pressure test report, pressure cycle fatigue durability test report, high and low temperature drift verification report, EMC electromagnetic compatibility report, IP waterproof and dustproof test report, and high-voltage insulation test report for high-pressure sensors.
Impact on Vehicle Performance
Pressure sensor performance directly affects vehicle thermal management, braking and high-voltage system safety. Abnormal low-pressure sensor data will cause unbalanced refrigerant and coolant pressure, resulting in air conditioning failure and poor heat dissipation. High-pressure sensor failure will lead to out-of-control pressure of new energy high-voltage system, trigger high-voltage protection and power interruption. Pressure data deviation will cause misjudgment of vehicle electronic control system, resulting in functional disorder and fault alarm, seriously affecting vehicle driving stability and safety.