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Air-fuel ratio control device and method for internal combustion engine

A control device and air-fuel ratio technology, applied in engine control, fuel injection control, electrical control, etc., can solve the problem of reducing the accuracy of updates

Active Publication Date: 2020-11-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if one of the main reasons why the correction ratio for the base injection amount obtained using the feedback operation amount is a value other than zero is the learning value for the port injection valve, updating of the learning value for the direct injection valve will Decrease the accuracy of updates

Method used

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  • Air-fuel ratio control device and method for internal combustion engine
  • Air-fuel ratio control device and method for internal combustion engine
  • Air-fuel ratio control device and method for internal combustion engine

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Embodiment Construction

[0027] An air-fuel ratio control device for an internal combustion engine according to an embodiment will now be described with reference to the drawings.

[0028] exist figure 1 The intake passage 12 of the internal combustion engine 10 shown in FIG. 2 is provided with an electronically controlled throttle valve 14 for changing the cross-sectional area of ​​the flow passage. The intake passage 12 includes a port injection valve 16 for injecting fuel to the intake port. Port injection valve 16 is located downstream of throttle valve 14 . The air in the intake passage 12 and the fuel injected from the port injection valve 16 fill the combustion chamber 24 defined by the cylinder 20 and the piston 22 according to the opening operation of the intake valve 18 . Direct injection valve 26 injects fuel into combustion chamber 24 . The spark plug 28 of the igniter 30 protrudes into the combustion chamber 24 . Thus, by spark ignition of the spark plug 28, the air-fuel mixture is ig...

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Abstract

The present invention relates to an air-fuel ratio control device and method for an internal combustion engine. The engine includes a first injection valve which is one of the port injection valve and the direct injection valve and a second injection valve which is the other of the port injection valve and the direct injection valve. When only the first injection valve is operated based on the base injection amount that has been corrected using the feedback operation amount and the first learned value, if the correction ratio of the base injection amount obtained using the feedback operation amount is not greater than a predetermined ratio, the air-fuel ratio control means updates the first a learning value and determine that the first learning value has converged. When the first injection valve and the second injection valve are operated, if the first learning value has converged and the ratio of the injection quantity of the second injection valve is not smaller than the prescribed value, the device updates the second learning value for the second injection valve .

Description

technical field [0001] The present invention relates to an air-fuel ratio control device and method for an internal combustion engine, and more particularly, to an air-fuel ratio control device and method for controlling an internal combustion engine including both port injection valves and direct injection valves, The port injection valve injects fuel into the intake passage, and the direct injection valve injects fuel into the combustion chamber. Background technique [0002] When the fuel injection valve is operated based on the base injection amount, the actual air-fuel ratio varies due to, for example, the deviation of the injection characteristic of the fuel injection valve from the reference characteristic and the difference between the actual in-cylinder intake air amount and the in-cylinder intake air amount used to calculate the base injection amount. Possibly deviated from the target value, the base injection amount is an open-loop operation amount for controlling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/24F02D41/30
CPCF02D41/1454F02D41/182F02D41/2445F02D41/2467F02D41/248F02D41/3094F02D2200/0614F02D41/263
Inventor 井户侧正直
Owner TOYOTA JIDOSHA KK
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