| 摘要 |
PURPOSE:To prevent an unbalanced condition between combustion air and fuel to enable them to be supplied at a specified air-fuel-ratio by a method wherein a metering part is arranged at a part of air supplying pipe and a flow rate of pump is controlled in response to a pressure difference sensed by a pressure difference sensor for use in detecting a pressure difference across the metering part. CONSTITUTION:A pressure difference sensor 9 for use in sensing a pressure difference across a throttle part 5a arranged within an air feeding pipe 5 may input the sensed signal to a fuel control device to control a fuel pump 6 to a proper flow rate of pump. The sensed pressure difference signal is inputted to a controller device for controlling the number of revolution to keep the number of revolution of a blower 4 for combustion at a desired value. A flow rate Q can be expressed by Q=alpha.{(2g.h.gammaw)/gammaa}<1/2>, where a pressure difference generated across the throttle part 5a is (h), a density of flowing fluid is gammaa and a density of fluid in a U-shaped pipe is gammaw, and then an amount of air is detected in response to a pressure difference across the throttle part 5a. With the foregoing, an amount of fuel fed is controlled in cooperation with an amount of air, so that an air-fuel-ratio becomes constant and an unstable combustion is prevented. |
