| 摘要 |
PURPOSE:To reduce mechanical wear by the operation of a heater by controlling an air fuel ratio so as to conform to the kind of a heater and load, and desired control precision on the basis of an weighted control response coefficient and a thermal mass characteristic. CONSTITUTION:Various boiler design thermal mass values are stored in a memory 41 and an air fuel ratio controller 42 composed of a microcomputer 42 converts a pressure set value input from an input/display 36 into a temperature set value on the basis of a thermal mass characteristic. Input response control coefficients which are weighted, for example, a set point tolerance may not be severe. Set point control is very severe or on the basis of a plurality of intermediate control response coefficients a temperature zone is set at a set point, further a pressure zone is provided and on the basis of a pressure feedback signal from a sensor 26, a heater S is controlled through a proportional controller 44. As the result, operating number of a motor 30 is lessened to reduce mechanical wear of the heater S. |
