| 摘要 |
PURPOSE:To precisely perform the exhaust reflux control or idle control by feedback-controlling the opening of an exhaust reflux valve and a throttle valve to the preset opening. CONSTITUTION:A control circuit 6 detects the operational condition based on signals (a), (b) from an engine speed sensor 7 and an intake air negative-pressure sensor 8, reads out the required opening Lmap of an exhaust reflex valve in response to the operational condition from a memory 20, and detects the displacement L of the relux valve based on the signal C from a position sensor 9. When the actual displacement Lact=L, it is inputted to a comparator circuit 32 together with Lmap. When Lmap>L, a control signal (d) is outputted to a control valve 5 from the circuit 6, the negative pressure applied to a negative pressure chamber is increased, and L is made equal to Lmap. In addition, when Lmap<L, a signal (e) is outputted to a solenoid 5b to lower the negative pressure, then L is made equal to Lmap and the reflux control is performed precisely. |
