| 摘要 |
PURPOSE:To effectively remove factors except for A/F ratio determining the combustion state by a method wherein the air/fuel ratio is detected from electric resistance of a metal oxide semiconductor with the combustor in exhaust gas and the exhaust gas temperature. CONSTITUTION:Upon receiving signals indicative of temperature and electric resistance from a metal oxide semiconductor gas sensor 10 mounted in an exhaust pipe 20 of an automobile engine, a data processor 30 sends a signal to a fuel injection amount controller 40. From the relationship curves between the electric resistance from the gas sensor and the exhaust gas temperature which are measured by operating an engine in ranges of 1,500-3,000rpm, 20-40 deg. ignition angle, 1/4- full load and 13-16.5 air/fuel ratio, which substantially satisfy the normal operation state of the automobile, it will be clearly observed that the A/F ratio can be determined with high accuracy independent of rpm, load and ignition angle. |
