| 摘要 |
A fuel metering system of an internal combustion engine is controlled by an analog computer circuit which delivers injection pulses to actuate the fuel injection valves of the engine. The duration of these pulses is directly related to the amount of injected fuel and depends partly on the inherent electrical characteristics of the components of the analog computer circuit. The pulse duration also depends on the instantaneous values of at least two engine parameters, r.p.m. and throttle valve position, i.e., the degree of opening of the air inlet valve. The r.p.m. signal is sensed by an appropriate transducer and triggers a monostable multivibrator in the analog computer circuit while the throttle valve position is sensed by a potentiometer and defines the charging rate of a capacitor. The voltage on the capacitor influences the action of the monostable multivibrator which delivers the fuel injection pulse. A multiplier circuit may be connected between the analog circuit and the injection valves for admitting corrective control signals, e.g., from an exhaust gas sensor or from an engine smoothness sensor.
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