| 摘要 |
PURPOSE:To make it possible to inject the required quantity of fuel, using an injection valve whose characteristic is suitable for the running condition of an engine, by setting plural injection valves whose characteristics are different from each other, in each cylinder. CONSTITUTION:Injectors 11, 12 whose characteristics are different from each other, are set in a suction pipe 2. These injectors 11, 12 have such characteristics as the injector 11 keeps its linear characteristic to the range where the fuel injection quantity is large, and the injector 12 keeps it linear characteristic to the range where the fuel injection quantity is small, in proportion to the valve opening time. Synchronous injection quantity is calculated from the intake air flow and the engine rotation speed, or the suction pipe pressure and the engine rotation speed, and synchronous injection is performed through calculating the valve opening time of the injector 12, in the range where the linear characteristic of the injector 11 is not kept under the low load. Even during the synchronous injection, desired plural synchronous injections can immediately be performed one after another, by the injector 12. Consequently, smooth running can be performed according to the operating conditions, and accelerating efficiency is raised as desired quantity of fuel can be freely fed without delay of time.
|
