| 摘要 |
PURPOSE:To prevent an O2 sensor from breaking due to a freeze of an adhering waterdrop, by actuating a heater for the predetermined time from stopping an engine when its temperature is in a predetermined value or less, in the case of a control device using a heater-provided O2 sensor having the characteristic linear for air-fuel ratio. CONSTITUTION:A control device 9, which calculates the basic injection quantity of fuel on the basis of detection values of an intake pipe pressure sensor 4 and an engine speed sensor 5, performs a feedback correction to the target air-fuel ratio by using an O2 sensor 8 which has the characteristic linear for air-fuel ratio and a built-in heater 100. And when an engine is detected to be stopped from a key switch further when a cooling water temperature sensor 10 detects a temperature of, for instance, 70 deg.C or less, the control device, which actuates a timer conducting a current to flow in the heater 100 through an output circuit 97 for the predetermined time, prevents steam in exhaust gas from being condensed to the O2 sensor 8. |
