| 摘要 |
PURPOSE:To prevent loss of balance in between the combustion gas and fuel by using a fuel supply device which changes the fuel discharge amount according to the pulse state and at the same time providing a pulse delaying section at a control section which controls the combustion air and fuel, which delaying section gradually changes pulses to a fuel supply device. CONSTITUTION:When signals inputted to the terminals AN1, AN2, and AN3 of a microcomputer 12 are compared at a comparison section 27, and it issues signals of 'strong' or 'weak' or 'off', the burner motor control section 30 changes over burner motor 3. At the same time the signal from the comparison section 27 is sent to a pulse delaying and changing section 31, and this changing section drives a drive circuit 4' through a photo-coupler 20 to actuate a pump 4. This changing section 31 compares the signals from a pulse generating section 32 and a target pulse setting section 33 at a comparison and detection section 34, and the cycle that difference in the comparison is corrected little by little at a correction section 35 to feed a corrected difference back to the pulse generating section 32 is repeated in order to make the pulse approach a target pulse gradually. With this arrangement it is possible to limit the air and fuel ratio to minimum when the combustion amount is changed over. |
