초록 ▼

An electronic controller for an internal combustion engine provides a ratio control signal corresponding to a respective air/fuel ratio, and responds to an air flow signal, a fuel flow signal and the ratio control signal to control fuel flow as to make the ratio of air flow to fuel flow substantiall

An electronic controller for an internal combustion engine provides a ratio control signal corresponding to a respective air/fuel ratio, and responds to an air flow signal, a fuel flow signal and the ratio control signal to control fuel flow as to make the ratio of air flow to fuel flow substantially equal to said respective air/fuel ratio. The ratio control signal is developed from a base run ratio control signal as modified in response to various parameters such as engine temperature, manifold pressure, idle, manifold vacuum, fuel temperature, wide open throttle, engine speed, and start. The controller also provides a speed-up circuit for promptly responding to change in air flow and dynamic braking for the fuel metering pump. The pump speed circuit includes a range extender. The controller further provides a timing advance control signal in response to air/fuel ratio and various engine parameters such as engine speed, manifold pressure, throttle position, engine temperature, air temperature, air/fuel ratio, and start.

대표청구항 ▼

In an electronic controller for an internal combustion engine having a throttle for controlling the flow of air into an intake manifold wherein rate of air flow into the engine is measured by producing an air flow signal systematically related to the rate of air flow, and rate of fuel flow into the

In an electronic controller for an internal combustion engine having a throttle for controlling the flow of air into an intake manifold wherein rate of air flow into the engine is measured by producing an air flow signal systematically related to the rate of air flow, and rate of fuel flow into the engine is measured by producing a fuel flow signal systematically related to the rate of fuel flow, said electronic controller including means for producing a ratio control signal corresponding to a respective air/fuel ratio, and means responsive to said air flow signal, said fuel flow signal and said ratio control signal for controlling fuel flow as to make the ratio of air flow to fuel flow substantially equal to said respective air/fuel ratio, the improvement wherein said means for producing said ratio control signal comprises means for providing a base run ratio signal corresponding to a respective run air/fuel ratio suitable for steady state engine operation, means for providing a temperature reference signal corresponding to a reference engine temperature, means responsive to engine temperature and said temperature reference signal for modifying said run ratio signal in systematic relation to engine temperature when said engine temperature is below said reference engine temperature to produce a run ratio signal corresponding to an air/fuel ratio systematically decreasing with decrease in engine temperature below said reference engine temperature, means for providing at least one other ratio signal corresponding to a respective air/fuel ratio suitable for engine operation under certain other conditions, discriminating output means responsive to applied ratio signals for producing a ratio control signal corresponding to the lowest air/fuel ratio of any applied ratio signal, and means for applying said run ratio signal and said at least one other ratio signal to said output means.