| 摘要 |
PURPOSE:To make the scattering of adjusted values of a basic air/fuel ratio small, by holding the adjustment of an air/fuel ratio setting mechanism in the vicinity of a range where the output of an oxygen concentration detector displayed under specific conditions are abruptly changed. CONSTITUTION:An oxygen concentration detector 7 in an air/fuel ratio feedback controlled type engine 1 is electrically connected to a solenoid valve 9 through a control circuit 8, and an idle port 23 opened to the downstream of a Venturi part 4 disposed in an intake passage 2, is adjusted in its open degree through a mixture adjusting screw 22 for controlling the flow of fuel. At first, a stationary duty oscillator 29 is started to be actuated for carrying out stationary duty control of the valve 9 after the valve 9 is connected to the oscillator 29 and the detector 7 is connected to a display unit 30 under the condition of deenergization of the circuit 8, and then the open degree of the port 23 is adjusted by rotating the screw 22 while the display unit 30 is observed for holding a desired air/fuel ratio. |
