| 摘要 |
PURPOSE:To obtain the always optimum air-fuel ratio by correcting the output of an oxygen detecting means installed into an exhaust system on the basis of the exhaust temperature and controlling the flow rate of either the supplied fuel or the combustion air according to the corrected control signal. CONSTITUTION:The opening-degree of a flow-rate control valve 3 in a gas fuel conduit 2 is set through a control circuit 10 on the basis of the load information obtained according to the output of an electric-current detector 9 installed onto a generator 8 driven by an internal-combustion engine 1. At this time, the opening- degree is properly corrected through a correcting circuit 16 according to the output of an oxygen detecting element 14. Further, within the temperature range where exhaust gas is relatively low, correction is performed according to the output of a temperature detecting element 15, by adding a large value onto the output voltage of the oxygen detecting element 14 on the basis of the temperature characteristic value of the oxygen detecting element 14 provided for a RAM17 beforehand. Therefore, always optimum air-fuel ratio which is not influenced by the variation of temperature of exhaust gas can be obtained. |
