| 摘要 |
<p>PURPOSE:To prevent the useless increase of output in the specific operation state of an engine, by setting a valve operation state changeover device at a state which copes with a low speed operation sphere, and at the same time, conducting control so as to set the supercharging volume of a supercharger at a state which becomes maximum. CONSTITUTION:A turbo charger 7 whose compressor portion 8 and turbine portion 12 are respectively provided at an air intake manifold 3 and an exhaust manifold 11, is constituted so that a supercharging volume may be able to be varied by changing an exhaust gas flow passage cross section area to the turbine portion 12 by means of an actuator 18. Also, a valve mechanism 14 is so constituted that its valve timing is able to be varied by controlling through a solenoid valve 16 and a changeover control valve 17 oil pressure generated by means of an oil pump 15 which is driven by an engine. And in this instance, in a specific operation state, the valve mechanism 14 is set at a valve timing state coping with a low speed operation sphere, and at the same time, control is made so that an actuator 18 may be set at a state in which the supercharging volume becomes maximum.</p> |
