Fuel injection amount control apparatus for engine
First Claim
1. A fuel injection amount control apparatus for an engine having a fuel injecting means for injecting fuel supplied to a combustion chamber, an air intake passage for introducing air to the combustion chamber, an exhaust passage for exhausting gas from the combustion chamber, an intake valve for selectively opening and closing the air intake passage, an exhaust valve for selectively opening and closing the exhaust passage and a valve adjusting means for adjusting an actuating characteristic of at least one of the intake valve and the exhaust valve, wherein said adjusting means is controlled by a first control means, and wherein said apparatus has a detecting means for detecting a running condition of the engine, a computing means for computing a target value representing the fuel injection amount injected by the fuel injecting means based on the detected running condition, a second control means for controlling the fuel injecting means based on the computed target value, learning means for learning a value representing an air-fuel ratio of a combustible fuel mixture based on the adjusted actuating characteristic and the detected running condition, a reflecting means for reflecting the learning value in computing the target fuel injection amount, a renewing means for renewing the learning value when the detected running condition is in a specific condition, and wherein the first control means controls the adjusting means based on the detected running condition, said apparatus including:
- compensating means for compensating the reflected learning value when the detected running condition is out of said specific condition.
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Accused Products
Abstract
A fuel injection amount control apparatus for an engine comprises injectors for injecting fuel to an engine and an electronic control unit (ECU) for controlling the injectors. The ECU learns the deviation between the air-fuel ratio of a flammable mixture to be supplied to the engine and the target value. The ECU controls the amount of fuel injection to the engine by reflecting the learning value on the computation of the injection amount. The engine has intake valves, exhaust valves and an apparatus for altering the open/close characteristics of the intake valves. The ECU computes the learning value of the air-fuel ratio in accordance with the behavior of the characteristic altering apparatus and the running conditions of the engine. When the coolant temperature of the engine is low and the learning value is not renewed, the ECU compensates the already updated learning value to a smaller value. The ECU performs this compensation based on the ratio of the real valve characteristic to the valve characteristic for the engine in a fully warmed-up state.
33 Citations
21 Claims
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1. A fuel injection amount control apparatus for an engine having a fuel injecting means for injecting fuel supplied to a combustion chamber, an air intake passage for introducing air to the combustion chamber, an exhaust passage for exhausting gas from the combustion chamber, an intake valve for selectively opening and closing the air intake passage, an exhaust valve for selectively opening and closing the exhaust passage and a valve adjusting means for adjusting an actuating characteristic of at least one of the intake valve and the exhaust valve, wherein said adjusting means is controlled by a first control means, and wherein said apparatus has a detecting means for detecting a running condition of the engine, a computing means for computing a target value representing the fuel injection amount injected by the fuel injecting means based on the detected running condition, a second control means for controlling the fuel injecting means based on the computed target value, learning means for learning a value representing an air-fuel ratio of a combustible fuel mixture based on the adjusted actuating characteristic and the detected running condition, a reflecting means for reflecting the learning value in computing the target fuel injection amount, a renewing means for renewing the learning value when the detected running condition is in a specific condition, and wherein the first control means controls the adjusting means based on the detected running condition, said apparatus including:
compensating means for compensating the reflected learning value when the detected running condition is out of said specific condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
Specification