In-range sensor fault diagnostic system and method

The invention relates to an in-range sensor fault diagnostic system and method. An internal combustion engine includes an electronic controller programmed to determine, for at least one combustion event in a combustion chamber, a theoretical polytropic constant, a measured polytropic constant, and a difference between the theoretical polytropic constant and the measured polytropic constant. The electronic controller is further programmed to calculate an adjusted pressure signal based on the pressure signal and the difference such that the adjusted pressure signal compensates for changes to an accuracy of the pressure sensor over time. 本发明涉及范围内传感器故障诊断系统及方法。种内燃机，包括电子控制器，该电子控制器编程用以针对燃烧室中的至少个燃烧事件来确定理论多变常数、测量的多变常数和该理论多变常数与该测量的多变常数之间的差。所述电子控制器进步编程用以基于压力信号和所述差来计算调整的压力信号，使得该调整的压力信号对压力传感器的经段时间的精确度的改变进行补偿。