| 摘要 |
<p>PURPOSE:To smoothly change a supercharged pressure and thereby improve the drivability, by controlling the supercharged pressure according to a corrected retard angle blunted by a blunting degree to be changed according to an engine load. CONSTITUTION:A control circuit 64 is provided to compute a difference DELTA(Q/NE) between a present value and a previous value of Q/NE representing an engine load as obtained from a suction air quantity Q and an engine speed NE which are actually measured by an air flow meter 34 and a second crank angle sensor 69, respectively. Then, computed is a blunting degree stored as a map for DELTA(Q/NE) in a memory 64b. Using the blunting degree set to be the larger, the more rapid a change rate of the load is, a blunted value of a corrected retard angle for ignition timing is computed. According to the blunted value of the corrected retard angle, a duty ratio in driving duty signals for a solenoid 58 of a bleed control valve 56 is computed from the map stored in the memory 64b.</p> |
