Fuel control apparatus for an internal-combustion engine
First Claim
1. A fuel control apparatus for an engine, comprising:
- exhaust gas recirculation control means for controlling the rate of recirculation of the exhaust gas to the intake system according to negative pressure varying with the opening of the throttle valve of the engine;
coefficient calculating means for determining, according to the current operating condition of the engine, a first coefficient for calculating fuel injection quantity for the operation of the engine in an exhaust gas recirculation stop mode in which the exhaust gas is not recirculated and second coefficients for calculating fuel injection quantity for the operation of the engine in an exhaust gas recirculation mode in which the exhaust gas is recirculated; and
fuel injection quantity calculating means for calculating fuel injection quantity by using first and second corrected coefficients obtained by correcting the first and second coefficients according to the opening of the throttle valve, and parameters representing the current operating condition of the engine.
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Accused Products
Abstract
A fuel control apparatus for an internal-combustion engine, capable of accurately determining fuel injection quantity according to exhaust gas recirculation rate regardless of bypass air flow rate and the atmospheric pressure. The fuel control apparatus comprises exhaust gas recirculation control means for controlling the rate of recirculation of the exhaust gas to the intake system according to negative pressure varying with the opening of the throttle valve of the engine, coefficient calculating means for determining, according to the current operating condition of the engine, a first coefficient for calculating fuel injection quantity for an exhaust gas recirculation stop mode in which the exhaust gas is not recirculated and second coefficient for calculating fuel injection quantity for an exhaust gas recirculation mode in which the exhaust gas is recirculated, and fuel injection quantity calculating means for calculating fuel injection quantity by using first and second corrected coefficients obtained by correcting the first and second coefficients according to the opening of the throttle valve, and parameters representing the operating condition of the engine.
29 Citations
6 Claims
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1. A fuel control apparatus for an engine, comprising:
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exhaust gas recirculation control means for controlling the rate of recirculation of the exhaust gas to the intake system according to negative pressure varying with the opening of the throttle valve of the engine; coefficient calculating means for determining, according to the current operating condition of the engine, a first coefficient for calculating fuel injection quantity for the operation of the engine in an exhaust gas recirculation stop mode in which the exhaust gas is not recirculated and second coefficients for calculating fuel injection quantity for the operation of the engine in an exhaust gas recirculation mode in which the exhaust gas is recirculated; and fuel injection quantity calculating means for calculating fuel injection quantity by using first and second corrected coefficients obtained by correcting the first and second coefficients according to the opening of the throttle valve, and parameters representing the current operating condition of the engine. - View Dependent Claims (2, 3, 4)
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5. A fuel control apparatus for an engine, comprising:
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exhaust gas recirculation control means for controlling the rate of supply of the exhaust gas to the intake system according to negative pressure varying with the opening of the throttle valve; first calculating means for correcting a given exhaust gas recirculating ratio corresponding to an operating mode of the engine with reference to the opening of the throttle valve; and second calculating means for calculating fuel injection quantity by using the corrected exhaust gas recirculation ratio and parameters representing the operating condition of the engine. - View Dependent Claims (6)
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Specification