关键词: 压力传感器, 补偿电路, MAX1452

Abstract: Taking a certain type of engine as a platform, and together with the starting oil supply law and test data, the accuracy requirements of the pressure sensor are derived. In view of the problem that the original pressure sensor accuracy does not meet the requirements, and under the premise of minimizing the amount of change, a compensation circuit is designed with the signal conditioning chip MAX1452 as the core. After test verification, the accuracy of the improved sensor is better than ±0.3%. With the improved sensor in the engine, there is no starting failure due to pressure measurement error during ground starting. The starting success rate is also greatly improved during plateau starting without sensor calibration. This design improves the success rate of engine starting and effectively reduces the calibration work of the sensor due to changes in atmospheric temperature or altitude.

Key words: pressure sensor, compensation circuit, MAX1452