| 摘要 |
PURPOSE:To effect exhaust gas recycle control of high accuracy almost independently of the intake system and exhaust system of an engine, by controlling the opening area ratio of a throttle valve to a variable throttle valve provided in an exhaust gas recycling device and regulating the pressure difference between the upstream and downstream sides of the vriable throttle valve. CONSTITUTION:An exhaust gas recycle passage extends from an exhaust pipe 3 to an intake pipe 2 through a pressure control valve 23, a pressure chamber 11 and the variable throttle valve 6. The intake pipe 2 extends between the engine 1 and the throttle valve 8 installed in an intake passage. The opening area of the variable throttle valve 6 is altered depending on the swing of a cam 30 coupled to the throttle valve 8 through a link 31. A pressure sensor 32 is actuated by the pressure difference between the upstream and downstream sides of the variable throttle valve 6 to control a negative pressure signal applied to a chamber 38 of a manipulating means 37 of a pressure control valve 23. Said pressure difference can be controlled to be constant as to any degree of opening of the variable throttle valve. |
