| 摘要 |
PURPOSE:To pick up only a specific feature of knocking data and to carry out the accurate decision of knocking constantly by picking up the output of an oscillation sensor at every explosion stroke of an engine, converting it into a digital signal, and frequency-analyzing it plural rounds. CONSTITUTION:An engine control device including a knocking detecting system inputs signals from an oscillation sensor 1 provided on an engine, and some other various sensors 2 to 4. And a CPU 25 carries out the operation process depending on the program of a ROM 24, determins a fuel injection signal and an ignition timing signal, and outputs them to actuators from an I/O output 23. In this case, in the CPU 25, the output signals of the oscillation sensor 1 are taken in plurally in divided times during one explosion stroke of the engine, and processed in a digital frequency analysis. And a main resonance frequency necessary to decide the knocking is set according to the operation condition of the engine. Furthermore, depending on the main resonance frequency, the results of plural digital frequency analyses are decided, so as to decide the generation of knockings. |
