| 摘要 |
PURPOSE:To make it possible to positively detect oxygen starvation regardless of strong or weak combustion by providing oxygen starvation discriminating means changing the oxygen starvation detection level in accordance with the quantity of combustion. CONSTITUTION:Analog input terminals AN1, AN2 and AN3 provided within a microcomputer 28 directly read in analog voltages, and connected to room temperature detection means 22, temperature setting means 34, and combustion state detection means 28. Within the microcomputer 28, an analog voltage from a room temperature detection means 33 is supplied through AN1, and an analog voltage from temperature setting means 34 through AN2. Both signals are compared with each other by combustion quantity determining means 35, and thus the quantity of combustion is determined. Combustion control means 36 causes combustion to be carried out based on the quantity of combustion and through combustion drive means 37. On the other hand, oxygen starvation discriminating means 39 compares an oxygen detecting level determined in the microcomputer 28 in accordance with the quantity of combustion with an analog voltage supplied to AN3 from combustion state detection means 38, and combustion control means 36 delivers a combustion extraordinary signal or a normal signal to combustion control means. |
