| 摘要 |
PURPOSE:To enable to perform reliable control of an air-fuel ratio to a desired value irrespective of the individual difference of a lean sensor, by installing a lean sensor output characteristic correcting means which corrects the output signal of the lean sensor to a reference characteristic depending on the individual difference of the lean sensor. CONSTITUTION:According to an exhaust air-fuel ratio being found from the output of a lean sensor 28, feedback correction and the like is applied to the basic injection quantity to determine a practical injection amount, and an electronic controller 32 outputting a valve opening time signal to an injector 22 is provided. The electronic controller 32 is provided with a non-inversion amplifier 70 having variable amplification factor, which amplifies the output of the lean sensor 28 inputted through a current-voltage converter 46, and a lean sensor output characteristic correcting means consisting a potentiometer dial 72 for correcting an output characteristic, matching the individual difference of the lean sensor 28, to a reference signal through adjustment of the amplification factor of the non-inversion amplifier 70 by changing the resistance value of a variable resistor R2. |
