| 摘要 |
PURPOSE:To permit the optimum air-fuel ratio, obtained at all times regardless of an exhaust gas temperature, by a method wherein the exhaust part of a gas combustion device is provided with a temperature sensor while a means, correcting the rotating number of an exhaust fan based on a detected temperature, is provided. CONSTITUTION:An exhaust chamber 15 is provided with the outlet port 18 of exhaust gas at the side thereof while the outlet port 18 is provided with an exhaust fan 4 and a temperature sensor 6, consisting of a thermistor or the like. The exhaust fan 4 and the temperature sensor 6 are connected to an air-fuel ratio control circuit 7 electrically while the temperature sensor 6 detects the temperature of exhaust gas and outputs a signal in accordance with the detected value to the air-fuel ratio control circuit 7. The air-fuel ratio control circuit 7 consists of a microcomputer while the rotating number of the fan for obtaining the optimum amount of air with respect to the preset amount of gas is stored by a table, produced in a relation between the exhaust gas temperature. A voltage or the value of current, supplied to the exhaust fan 4, is controlled variably based on the stored data and the detecting value of the temperature sensor 6. |
