| 摘要 |
PURPOSE:To provide a silent sound and prevent a non-required increasing of a chamber temperature by a method wherein a lack of oxygen is detected under a high combustion only when a combustion state is deteriorated in the case of a weak combustion. CONSTITUTION:A combustion controlling part 1 may determine an amount of combustion in response to signals from a temperature setting means and an interior temperature detecting means, and a lack of oxygen level VX which corresponds to an amount of combustion is calculated. A combustion device 2 may form a combustion flame corresponding to an amount of combustion determined by a combustion controlling part 1. A combustion state of the combustion flame is detected by a combustion detecting part 4 and a combustion state signal VFR is inputted to a lack of oxygen safety part 3. The lack of oxygen safety part 3 may compare a lack of oxygen signal VX from a combustion control part 1 with a signal VFR from a combustion sensing part 4, discriminate a lack of oxygen and at the same time give a control signal to the combustion control part 1 in response to a result of discrimination and then control the combustion device 2. In this case, the lack of oxygen safety part 3 may compare it with a lack of oxygen level VH again in case of a high combustion as a forced high combustion only for a short period of time only when the signal VFR is lower than a lack of oxygen level VL under a weak combustion. In case that this is lower than the lack of oxygen level VH, the combustion is terminated and at the same time if it is higher than the lack of oxygen level VH, it may return it to a weak combustion. |
