| 摘要 |
PURPOSE:To allow a peak point of a combustion pressure to be optimum by controlling an ignition timing in such a way that the pressure difference of combustion between two crank angles, which are closely adjacent to each other at a point right after a top dead point, will be a target value. CONSTITUTION:The pressure difference in combustion (an AD conversion is effected) between two crank angles, which are closely adjacent to each other at a point right after a top dead point detected by a crank angle detecting means 3, and are detected by a combustion pressure detecting means 2, is operated by a combustion pressure difference operating means 4. On the other hand, a target value for the pressure difference is set up by a target value set-up means 5 in such a way that the peak point of the combustion pressure is specified. The target value may be set up based on an engine speed. And an ignition timing is operated by a ignition timing operating means 6 so as to allow the pressure difference of the actual measurement to coincide with the target value. With this, the ignition timing can be precisely controlled so that the peak point of the combustion pressure may be the specified value. |
