| 摘要 |
PURPOSE:To improve a feed-back control of a suction air volume in a suction air volume control device for internal-combustion engine by a method wherein a variation in speed per one revolution of the engine is added to a previous calculated variation in speed and produced as a control value. CONSTITUTION:To an input terminal IN is supplied an output pulse A of a crank angle sensor and at the same time both counter 1 and a timing pulse generator 2 are connected. To the output end of the divider 6 are connected three latches 7-9, and to each of the output ends of the latches 7-9 is connected an adder unit 10. An output signal of the adder unit 10 becomes a control value of D operation (a differentiating operation proportional to a variation in differential speed between the target number of revolution and the actual number of revolution). In this way, since the variation in speed (differentiated value) per one revolution of the engine calculated by the differentiation calculating circuit is at least added to the previous calculted variation in speed and the added value is produced out as a control value of D operation, it is possible to improve a feedback control of the suction air volume. |
