| 摘要 |
PURPOSE:To prevent the generation of incomplete combustion definitely by decreasing a quantity of supply fuel automatically by a preset quantity when the air capacity of a detection fan fails to exceed the air capacity of the low limit fan equivalent to an adjusted value of a quantity of supply fuel. CONSTITUTION:When an air capacity Q of a detection fan turns into a value Qc smaller than an air capacity Qb of a lower limit fan equivalent to an adjusted value Ga of a quantity of supply fuel G from a preset correlation 1b between a fuel supply quantity G and a lower limit fan air capacity, it is considered that a fan capacity has reached its upper limit already and an attempt is made to control a solenoid proportional valve 8 in automatic mode so that a fuel supply quantity G may be reduced to a value Gc equivalent to a detection fan air capacity Gc from a preset correlation 1b on a lower limit fan air capacity side. In other words, this invention makes it possible to avoid a decisive shortage of the air capacity for the fuel supply quantity by automatically controlling the fuel supply quantity G on a reduction side when the fan capacity is under a critical state, and hence prevent the generation of incomplete combustion definitely due to the shortage of air capacity. |
