| 摘要 |
PURPOSE:To execute optimum fuel control at all times, by using a heat-sensitive element as a means for detecting the vortex frequency of a vortex flow meter for detecting the quantity of intake air, detecting the mass flow rate from the output of said detecting means, and executing fuel calculation according to the operation zone judged from signals representing the operational conditions of an engine. CONSTITUTION:A vortex generator 6 is disposed in an intake pipe 16 on the downstream side of an air cleaner 1, and hot wires 4, 5 are provided for detecting the frequency of vortices generated by the vortex generator 6. These hot wires 4, 5 are connected to a detecting circuit 7 for a vortex flow meter. A frequency signal equivalent to the valume flow rate of intake air per unit time is obtained in the detecting circuit 7, and the frequency signal is afforded to a fuel control unit 11 together with the outputs of a sensor 3 for detecting the temperature of intake air, an engine-temperature sensor 12, an O2-sensor 13, a sensor 9 for detecting the opening of a throttle valve, an intake-pressure sensor 14, etc. With such an arrangement, a required quantity of fuel is calculated in the fuel control unit 11, and a pulse having a reference duration is applied to a fuel injection valve 8 in synchronism with the above frequency output or the frequecy obtained by frequency-dividing of the same. |
