The invention relates to a method for diagnosing loss of an engine crankshaft signal and a camshaft signal. The method comprises the following steps: monitoring a key position signal; if the key position signal is START, monitoring an engine oil pressure signal, a crankshaft signal and a camshaft signal; if no crankshaft signal exists and the camshaft signal exists, outputting a crankshaft abnormal signal; if no camshaft signal exists and the crankshaft signal exists, outputting a camshaft abnormal signal; if no crankshaft signal or no camshaft signal exists, comparing the engine oil pressuresignal with an engine oil normal pressure lower limit value; if the engine oil pressure signal exceeds the engine oil normal pressure lower limit value, outputting crankshaft and camshaft abnormal signals; and if the engine oil pressure does not exceed the engine oil normal pressure lower limit value, outputting a starter abnormal signal. When the crankshaft signal and the camshaft signal are lostat the same time, the running conditions of a crankshaft rotating speed sensor, a camshaft rotating speed sensor and the engine can still be correctly judged; and the logic relationship among the crankshaft signal, the camshaft signal and the engine rotation condition is perfected.
本发明涉及诊断发动机曲轴信号和凸轮轴信号丢失的方法,包含步骤:监测钥匙位置信号;如钥匙位置信号为START,监测机油压力信号、曲轴信号和凸轮轴信号;如无曲轴信号,且有凸轮轴信号,输出曲轴异常信号;如无凸轮轴信号,且有曲轴信号,输出凸轮轴异常信号;如无曲轴信号,且无凸轮轴信号,将机油压力信号与机油正常压力下限值对比;如机油压力信号超过机油正常压力下限值,输出曲轴及凸轮轴异常信号;如未超过机油正常压力下限值,输出启动机异常信号。本发明在曲轴信号、凸轮轴信号同时丢失时仍能对曲轴转速传感器、凸轮轴转速传感器以及发动机的运转情况作出正确判断;完善了曲轴信号、凸轮轴信号、发动机转动情况之间的逻辑关系。
Method of diagnosing loss of engine crankshaft signal and camshaft signal
诊断发动机曲轴信号和凸轮轴信号丢失的方法
2020-10-16
Patent
Electronic Resource
Chinese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02B INTERNAL-COMBUSTION PISTON ENGINES , Brennkraftmaschinen mit innerer Verbrennung mit Verdrängerwirkung |
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