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With the increasing electrification and intelligence of modern vehicles, sensors play a critical role in ensuring accurate monitoring and control of engine and vehicle subsystems. Among them, integrated pressure–temperature sensors have become essential components in automotive applications such as fuel systems, lubrication circuits, and thermal management modules. Their ability to provide multi-parameter information in a compact structure significantly improves system efficiency and reliability.

The core advantage of an integrated pressure–temperature sensor lies in its structural integration. By combining pressure-sensitive and temperature-sensitive elements on a single substrate, the sensor reduces installation space and minimizes signal delay caused by separated measurement points. Silicon-based microelectromechanical systems (MEMS) technology is commonly used to fabricate such sensors due to its high sensitivity, good repeatability, and compatibility with mass production.

From a design perspective, pressure sensing is typically achieved using piezoresistive or capacitive elements, while temperature measurement relies on resistive temperature detectors or semiconductor junctions. Careful layout optimization is required to avoid thermal interference between the two sensing units. Signal isolation and compensation algorithms are often introduced to reduce cross-sensitivity and improve measurement accuracy under dynamic operating conditions.

In automotive environments, sensors are exposed to vibration, temperature cycling, and electromagnetic interference. Therefore, packaging design is as important as sensing performance. Metal or ceramic housings with high sealing performance are commonly used to protect internal components from moisture, oil contamination, and mechanical shock. At the same time, robust electrical connectors and shielded signal paths help ensure stable data transmission to the electronic control unit.

Performance evaluation of integrated pressure–temperature sensors usually includes static calibration, dynamic response testing, and environmental reliability assessment. Calibration tests verify measurement accuracy over the full operating range, while dynamic tests evaluate response speed under rapid pressure and temperature changes. Environmental tests such as thermal shock, vibration endurance, and long-term aging are conducted to ensure sensor stability throughout its service life.

The application benefits of integrated sensors are significant. By providing real-time pressure and temperature data, control systems can implement more precise feedback strategies, improve energy efficiency, and detect abnormal operating conditions at an early stage. This capability is particularly valuable in advanced engine management and predictive maintenance systems.

In conclusion, integrated pressure–temperature sensors represent an important development trend in automotive sensing technology. Their compact structure, high reliability, and multifunctional capability make them well suited for modern vehicle systems that demand accurate monitoring and intelligent control.