| 摘要 |
PURPOSE:To improve the accelerating performance of an engine having a fuel supply interrupting means, by preventing after-burning and adverse influences accompanied thereby by providing a secondary-air supply control means for supplying secondary air at the portion of an exhaust passage located on the upstream side of a turbine. CONSTITUTION:An engine 1 has a turbocharger 6 which consists of a turbine 6a and a blower 6b. When operation of the engine 1 is shifted to the decelerating mode with closing of a throttle valve 9 and the engine speed is in its high-speed region, output of a fuel control signal (a) from a control circuit 11 is stopped and a fuel injection valve 10 stops injection of fuel. In this state, a driving signal (f) is given and a three-way changeover valve 18 is operated to supply secondary air from an air pump 17 to an exhaust passage 5 at the portion thereof located on the upstream side of the turbine 6a. By employing such an arrangement, it is enabled to prevent after-burning and adverse influences to the exhaust pipe and a catalytic converter accompanied by the after-burning. |
