| 摘要 |
<p>PURPOSE:To prevent an O2 sensor from breaking due to a freeze of an adhering waterdrop, by actuating a heater to be electrified for the predetermined time from stopping an engine when a temperature of the outside air 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 control of air-fuel ratio to the target air-fuel ratio by using an O2 sensor 8 which has the characteristic linear for the air-fuel ratio further a built-in heater 100. And if an engine is detected to be stopped from a key switch further if a temperature of the outside air is decided to be in a low temperature region from a temperature sensor 19, the control device, which actuates a timer actuating the heater 100 to be electrified through an output circuit 97 for the predetermined time, prevents steam in exhaust gas from condensing to the O2 sensor 8.</p> |
