| 摘要 |
PROBLEM TO BE SOLVED: To erase hysteresis of a fuel flow regulator valve by using a signal oscillating between a first value and a second value at a specified frequency as an electric current control signal outputted by a main control circuit to the fuel flow regulator valve and setting a target current value at an average of current values commanded according to the first and second values. SOLUTION: When a drive current value Id to be fed to a proportional valve 14 according to required amount of combustion in a combustion part is equal to a target value S, a current control signal Ss outputted by a microcomputer 11 becomes a signal oscillating between a first value and a second value so as to produce conditions for supplying currents corresponding to a target value S+αand a target value S-αto a proportional valve 14 at a frequency of (ts). Thus, the proportional valve 14 is always oscillated from the target value S+αto the target value S-αand from the target value of S-αto the target value of S+α, and in a control system a feedback control for realizing the target value S+αand the target value S-αfollows the oscillation. Thus, hysteresis of the proportional valve 14 is erased and highly accurate control of fuel becomes possible.
|
