Abstract: LPG decompressed in a regulator is fed as primary fuel into an intake passage from a carburetor, and is fed as supplementary fuel to the intake passage from an injector. An ECU controls a control variable for the injector to cause an air/fuel ratio detected in an oxygen sensor to be a stoichiometric air/fuel ratio. At idle operation, an optimum state of the control variable with respect to a target value is output from a monitor terminal and is monitored, and an adjusting screw in a slow passage is operated and adjusted to cause the control variable to be the target value. An adjustment range for the control variable is set into two stages through operation of the test terminal. The ECU controls an output pattern of a monitor terminal in individual adjustment ranges at each stage, according to whether or not the control variable falls within the adjustment range.

Abstract: A fuel injection control apparatus includes a fuel injection device 14 and an electronic control unit (ECU) 30. The fuel injection device includes a plurality of injectors 9 mounted on a delivery pipe 10, a memory 43 which stores an injection characteristic of each injector 9 provided in the pipe 10, a driving circuit 41, and others. The ECU 30 calculates a control amount, which is equivalent to an injection amount to be injected from one injector 9 each time, based on an injector standard characteristic, refers to a memory 43 to correct characteristic data of each injector 9 corresponding to the control amount, and outputs. The driving circuit 41 of the fuel injection device 14 controls each injector 9 based on the corrected control amount to individually controls the fuel injection amount of each injector 9.

Abstract: LPG decompressed in a regulator 3 is fed as primary fuel into an intake passage 6 from a carburetor 9, and is fed as supplementary fuel to the intake passage 6 from an injector 11. An ECU 4 controls a control variable for the injector 11 to cause an air/fuel ratio detected in an oxygen sensor 53 to be a stoichiometric air/fuel ratio. In an idle operation, an optimum state of the control variable with respect to a target value is output from a monitor terminal 57 and is monitored, and an adjusting screw 37 in a slow passage 36 is operated and adjusted to cause the control variable to be the target value. An adjustment range for the control variable is set into two stages through operation of the test terminal 56. The ECU 4 controls an output pattern of a monitor terminal 57 in individual adjustment ranges at each stage, according to whether or not the control variable falls within the adjustment range.