| 摘要 |
An electronic engine control system is proposed utilizing a digital microprocessor for controlling the timing mechanism (13) and fuel pump rack limit (23) to set the engine timing of, and maximum allowable rate of fuel delivery to, an integral combustion engine (11) so that maximum engine performance is obtained with smoke and emissions limited to required levels. A plurality of timing maps (61-64) are provided, for different modes of engine operation, each map having predetermined timing control signals values programmed therein corresponding to the optimal timing advance at a particular engine speed, or particular optimal timing advance at a particular engine speed, or a particular combination of engine speed and position of the fuel rack (21). A timing map selector (65) identifies the mode of engine operation and selects the appropriate timing map (61-64) to control the timing mechanism (13) by the particular programmed signal for the existing engine speed and fuel rack position. A similar map (71-74) will output a particular programmed fuel/air signal in accordance with the existing engine speed and timing, the fuel/air signal having been predetermined to correspond to the maximum fuel/air ratio for fuel combusion to meet set limits for that engine speed and timing. The fuel/air signal is multiplied in accordance with existing manifold pressure and the resultant fuel delivery signal is used to set the rack limit for maximum allowable fuel delivery to the engine. |
