FUEL INJECTION SYSTEM WITH LEARNING CONTROL TO COMPENSATE FOR ACTUAL-TO-TARGET INJECTION QUANTITY
First Claim
1. A fuel injection system for a multi-cylinder internal combustion engine comprising:
- fuel injectors each of which sprays fuel into one of cylinders of an internal combustion engine; and
an injection controller working to perform a learning control function, a learning error determining function, and a malfunction specifying function, the learning control function being executed when the engine is placed in a given condition to regulate a pressure of fuel to be sprayed from each of the fuel injectors to each of given learning pressures, the learning control function injecting a learning spray of the fuel into the engine to sample a resulting change in operating condition of the engine to calculate an actual injection quantity that is the quantity of fuel expected to have been sprayed from the each of the fuel injectors and calculating an injection correction value required to bring the actual injection quantity toward a target quantity, the learning error determining function being to make a determination of whether there is an error in each of the injection correction values or not which is calculated at one of the learning pressures for each of the fuel injectors, the malfunction specifying function being to analyze a result of the determination made by the learning error determining function to specify a malfunction occurring with regard to the fuel injection system.
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Accused Products
Abstract
A fuel injection system designed to execute a learning operation to spray fuel through fuel injectors at each of given pressures of the fuel to determine the quantity of fuel sprayed actually from each of the fuel injectors (i.e., an actual injection quantity) into an internal combustion engine. The system calculates a deviation of each of the actual injection quantities from a target quantity to determine an injection correction value required to eliminate such a deviation. The system determines whether each of the injection correction values has an error or not and analyzes the mode in which the errors appear at the injection correction values to specify types of malfunction occurring in the system. The system relearns ones of the injection correction values as determined to have the errors.
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Citations
16 Claims
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1. A fuel injection system for a multi-cylinder internal combustion engine comprising:
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fuel injectors each of which sprays fuel into one of cylinders of an internal combustion engine; and an injection controller working to perform a learning control function, a learning error determining function, and a malfunction specifying function, the learning control function being executed when the engine is placed in a given condition to regulate a pressure of fuel to be sprayed from each of the fuel injectors to each of given learning pressures, the learning control function injecting a learning spray of the fuel into the engine to sample a resulting change in operating condition of the engine to calculate an actual injection quantity that is the quantity of fuel expected to have been sprayed from the each of the fuel injectors and calculating an injection correction value required to bring the actual injection quantity toward a target quantity, the learning error determining function being to make a determination of whether there is an error in each of the injection correction values or not which is calculated at one of the learning pressures for each of the fuel injectors, the malfunction specifying function being to analyze a result of the determination made by the learning error determining function to specify a malfunction occurring with regard to the fuel injection system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification