Fuel injection device for internal combustion engine
First Claim
1. A fuel injection device for an internal combustion engine, the fuel injection device comprising:
- a fuel supply pump for pressure-feeding high-pressure fuel to a fuel injection valve mounted in a cylinder of the engine; and
a learning controller for executing main learning for learning and correcting a variation of an instrumental error of the fuel supply pump when a learning execution condition is satisfied, whereinthe learning controller includes a tentative learning execution device that executes tentative learning for learning and correcting the variation of the instrumental error of the fuel supply pump before the learning execution condition is satisfied, andthe tentative learning execution device executes the tentative learning at least once after initial tentative learning is executed before a transition to the main learning is made.
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Abstract
A fuel injection device of an internal combustion engine executes tentative learning repeatedly while engine cooling water temperature increases. An actual learning value is renewed with the newest instrumental error learning value so that accuracy of the actual learning value is improved gradually. Thus, a variation of characteristics due to an instrumental error of a supply pump is absorbed as early as possible. In addition, accuracy of a tentative learning value obtained through the tentative learning is quickly brought close to the accuracy of the actual learning value obtained through main learning. As a result, a learning period at vehicle factory shipment is shortened and productivity at a vehicle factory is improved.
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Citations
15 Claims
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1. A fuel injection device for an internal combustion engine, the fuel injection device comprising:
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a fuel supply pump for pressure-feeding high-pressure fuel to a fuel injection valve mounted in a cylinder of the engine; and a learning controller for executing main learning for learning and correcting a variation of an instrumental error of the fuel supply pump when a learning execution condition is satisfied, wherein the learning controller includes a tentative learning execution device that executes tentative learning for learning and correcting the variation of the instrumental error of the fuel supply pump before the learning execution condition is satisfied, and the tentative learning execution device executes the tentative learning at least once after initial tentative learning is executed before a transition to the main learning is made. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method of a fuel injection device for an internal combustion engine, the control method comprising:
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a tentative learning step of executing tentative learning for learning and correcting a variation of an instrumental error of a fuel supply pump that pressure-feeds high-pressure fuel to a fuel injection valve mounted in a cylinder of the engine before a learning execution condition is satisfied, and a main learning step of executing main learning for learning and correcting the variation of the instrumental error of the fuel supply pump when the learning execution condition is satisfied, wherein the tentative learning step executes the tentative learning at least twice before a transition to the main learning is made. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification