| 摘要 |
PURPOSE: To provide a negative pressure controller of an internal combustion engine capable of supplying sufficient negative pressure to a brake booster without increasing a load on the internal combustion engine even in the internal combustion engine run stationarily under the suction pipe pressure approximate to the atmospheric pressure. CONSTITUTION: A brake booster 17 is connected to a surge tank 14 by a connecting piping 18. A control section 19 not only determines the opening of a throttle valve 15 corresponding to the running condition, but also closes the throttle valve, generate negative pressure in the surge tank and maintain the function of the brake booster when a pressure sensor detects that pressure for operating the brake booster approaches the atmospheric pressure. Further, in an internal combustion engine carrying out fuel injection for stratified combustion during low load running, the fuel injection is altered to one for uniform combustion in closing the throttle value. |
