| 摘要 |
PURPOSE: To control combustion air ratios by respectively detecting the temperatures of a catalyst and its upstream, and correcting the control objective value of the combustion air ratio in an engine in which aλsonde is arranged in a gas exhaust pipe line having a catalyst apparatus, and the combustion air ratio is controlled by output of the sonde. CONSTITUTION: Aλsonde 23 is arranged in upstream of a three-way catalyst 21 of a gas exhaust pipe line 22 of an internal combustion engine 20, the output of the sonde (sonde voltage) 24 is input into aλcontroller 25, and is compared there with the objective value 28 transmitted from an objective value generator 47. An adjustment operating order 29 corresponding to the deviation being the results of the comparison is transmitted to a throttle valve 30 in the gas pipe 31, and is used for controlling the opening of the throttle valve. And, temperature sensors 50, 45 are respectively arranged in the catalyst 21 and its upstream in the gas exhaust pipe 22, the temperature signals T1, T2 are transmitted to the objective value generator 47 to calculate the temperature deviation. Based on the temperature deviation, while detecting the curve point of changing of theλvalue, the control objective value is corrected based the temperature deviation.
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