| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a combustion device which highly precisely sets a target rotation speed of a fan while responding to a change in the lapse of time of the degree of closure of a suction and exhaust passage and, at the same time, determines the target rotation speed of the fan while responding to a sudden or temporary change of the degree of closure of the suction and exhaust passage, too. <P>SOLUTION: When a combustion operation continues for a prescribed time or more, the fan is operated at a prescribed closure detecting rotation speed upon the stopping of the combustion operation, a first correction coefficient Ha is calculated from the relation between a fan current and the closure detecting rotation speed upon the operation of the fan and, after upper limit correction, the first correction coefficient Ha is stored in a memory 11 as the fourth correction coefficient Ha. Along with the start of the combustion operation, the controlling of the fan is started at the target rotation speed calculated by setting the initial value of H to be Ha, a fan current Id is detected and the second correction coefficient Hb is calculated from Id (STEP5, 9, 10). Ha is compared with Hb and, in case of Hb-Ha<a positive given value C1 (STEP11NO), the target rotation speed is changed into the target rotation speed re-calculated by replacing H to Hb to control the fan. <P>COPYRIGHT: (C)2012,JPO&INPIT |
