| 摘要 |
PURPOSE:To make a sharp reduction in the memory capacity of a microcomputer attainable, by finding the desired fuel injection timing in a way of making full use of a specified map on the basis of output from both of a fuel injection quantity detector and an actual fuel injection timing detector. CONSTITUTION:In time of engine driving, at a central processing unit 2, first a specified two-dimensional map is searched from each output of an engine speed sensor 1a and an accelerator manipulated variable sensor 1b and a fundamental fuel injection quantity Qb is found. Then, a maximum limit injection quantity Qmax made by compensating, with a suction pressure sensor 1b and a suction air temperature sensor 1c, the given fundamental maximum injection quantity in referring to a one-dimensional map, which sets an engine speed down to parameter, is calculated. Next, each of injection quantities Qb and Qmax is compared, and the value at the lower side is selected, setting the selected one down to the desired injection quantity Qf. In succession, using the one-dimensional map on the basis of the engine speed, fundamental desired injection timing Th is found, and this given timing is compensated according to engine driving conditions, setting it down to the desired injection timing Tf whereby a timer piston position adjusting device 11 is feedback-controlled. |
