| 摘要 |
A circuit to be used in association with a fuel mixture control system which includes an oxygen sensor in the exhaust system to determine the relative richness of the combustible mixture. When the engine operates at low speeds, its control response time becomes large due to decreased engine throughput. In order to prevent control oscillations from occcurring under these conditions, the time constant of integration of the oxygen sensor control loop is changed to accommodate to the longer engine response time. For this purpose, the zero crossings of the oxygen sensor signal are compared with the unstable time constant of a multivibrator and a transistor which normally shunts a timing resistor is blocked, thereby increasing the time constant of the control integrator.
|
