| 摘要 |
PURPOSE:In an air-fuel ratio fedback control utilizing the exhaust gas density, to perform the accurate and quick control by comparing the output from O2 sensor with the referential level then performing the integration control with the rotation for every predetermined time of the angular positional signal. CONSTITUTION:The proportional control or the integration control is performed selectively in accordance to the variation of the output voltage from an O2 sensor 15 under the closed loop control. In other word when the output voltage from the O2 sensor 15 will vary only at the high or the low level side for the referential voltage, such integration control is performed as the O2 feedback factor KO2 will be increased/decreased with the time constant corresponding to the one rotation Ne of the engine, while when the output voltage from the O2 sensor 15 will vary from the high to the low or from the low to the high for the referential voltage, such proportional control is performed as the value corresponding to the rotation is temporality increased/decreased against the factor KO2. Consequently the accurate and quick control corresponding to the rotation is achieved resulting in the stabilization of the operating performance and the exhaust gas emission. |
