| 摘要 |
PURPOSE:To obtain stable air-fuel ratio at low speed and improve driveability in a main nozzle range, by providing an injector nozzle in the downstream of a throttle valve and controlling the injector nozzle through a feedback signal of an engine operational condition and air-fuel ratio in a main nozzle range. CONSTITUTION:In an operational range of a small intake air quantity to an engine 1, fuel is not fed from a main nozzle 7, and fuel, injected from an injector nozzle 12, is fed to the engine 1. In this case, an opening time of the injector nozzle 12 is controlled by an output signal of a computer 21 on the basis of each signal from an exhaust concentration sensor 22, cooling water temperature sensor 23 and intakef pipe negative pressure sensor 24, and a speed signal 25 of the engine. Further in a main nozzle range, an injector 11 performs correction of air-fuel ratio through feedback control by the computer 21 received with a signal from each sensor, to feed optimum fuel to the engine 1. |
