Control system for internal combustion engine
First Claim
1. A control system for an internal combustion engine comprising:
- an air flow meter for metering the flow rate of intake air supplied to the engine and for producing an output signal relative to the flow rate of intake air;
a plurality of sensors for detecting different conditions of engine operation;
a microprocessor for carrying out digital computation on the basis of the output signal of said air flow meter and the output signals of said sensors thereby providing a plurality of control signals for controlling the controlled variables of the engine;
fuel supply means for supplying fuel to the engine; and
fuel flow rate control means for controlling the flow rate of fuel supplied by said fuel supply means according to a fuel flow rate control signal among the control signals;
wherein said air flow meter includes means for producing, as said output signal relative to the flow rate of intake air, a non-linear signal having a non-linear characteristic such that the changing rate of said signal with respect to the flow rate of intake air is greater in a predetermined region in which the flow rate of intake air is small than in other regions of the flow rate of intake air, said microprocessor being supplied with said non-linear signal in a digital form for carrying out digital computation on the basis of said non-linear signal.
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Abstract
A control system including a microprocessor for controlling the controlled variables of an internal combustion engine, especially, the flow rate of fuel is disclosed. An air flow meter provides an output signal having such a non-linear characteristic relative to the flow rate of intake air that the signal level increases in the region of the small flow rate of intake air. The microprocessor carries out necessary digital computation on the basis of the output signal of the air flow meter to provide a fuel flow rate control signal. This digital control signal is converted into a signal having a linear characteristic proportional to the flow rate of intake air, or after having been produced from the microprocessor, converted into a signal including information proportional to the flow rate of intake air.
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Citations
11 Claims
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1. A control system for an internal combustion engine comprising:
- an air flow meter for metering the flow rate of intake air supplied to the engine and for producing an output signal relative to the flow rate of intake air;
a plurality of sensors for detecting different conditions of engine operation;
a microprocessor for carrying out digital computation on the basis of the output signal of said air flow meter and the output signals of said sensors thereby providing a plurality of control signals for controlling the controlled variables of the engine;
fuel supply means for supplying fuel to the engine; and
fuel flow rate control means for controlling the flow rate of fuel supplied by said fuel supply means according to a fuel flow rate control signal among the control signals;
wherein said air flow meter includes means for producing, as said output signal relative to the flow rate of intake air, a non-linear signal having a non-linear characteristic such that the changing rate of said signal with respect to the flow rate of intake air is greater in a predetermined region in which the flow rate of intake air is small than in other regions of the flow rate of intake air, said microprocessor being supplied with said non-linear signal in a digital form for carrying out digital computation on the basis of said non-linear signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- an air flow meter for metering the flow rate of intake air supplied to the engine and for producing an output signal relative to the flow rate of intake air;
Specification