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Learning control device of air-fuel ratio of internal combustion engine

A technology of learning control and air-fuel ratio, applied in engine control, fuel injection control, internal combustion piston engine, etc., can solve problems such as difficult to expect feedback control, inability to achieve injection cooling, etc., to prevent lean, reduce the number of components, cost reduction effect

Active Publication Date: 2013-10-30
HONDA MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the internal combustion engine is operating in a high rotation and high throttle opening region, it is preferable to prevent the temperature rise of the internal combustion engine by making the fuel injection amount an air-fuel ratio higher than the stoichiometric ratio (air-fuel ratio on the rich side) (injection cooling). ), execute O in the above operating state 2 In the case of feedback control, spray cooling may not be possible
In addition, when the internal combustion engine is operating in the low-rotation and low-throttle opening range, the amount of air sucked by the internal combustion engine is small and the amount of combustion is also reduced, so it is difficult to expect high-precision O 2 feedback control

Method used

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  • Learning control device of air-fuel ratio of internal combustion engine
  • Learning control device of air-fuel ratio of internal combustion engine
  • Learning control device of air-fuel ratio of internal combustion engine

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Embodiment Construction

[0040] Below, refer to Figure 1 to Figure 11 , to describe the embodiment of the present invention, first, in figure 1 Among them, for example, a cylinder bore 11 of a water-cooled internal combustion engine E mounted on a motorcycle is fitted with a slidable piston 12, and a suction port for supplying a mixture gas to a combustion chamber 13 facing the top of the piston 12 is used. The gas device 14 and the exhaust device 15 for discharging the exhaust gas from the combustion chamber 13 are connected to the cylinder head 16 of the internal combustion engine E. An exhaust passage 18 is formed. In addition, a spark plug 20 whose front end faces the combustion chamber 13 is attached to the cylinder head 16 .

[0041] The air intake device 14 is provided with an openable and closable throttle valve 21 for controlling the amount of intake air flowing through the intake passage 17 , and is attached to the intake air passage downstream of the throttle valve 21 . 17 Fuel injectio...

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Abstract

The invention relates to a learning control device of the air-fuel ratio of an internal combustion engine, which performs fuel injection-based air-fuel ratio control even in a region outside an O2 feedback region, and the fuel injection reflects the aging change of the internal combustion engine. In a load region outside the O2 feecback region, a control unit uses a learning value of the O2 feedback region adjacent to the load region to control the fuel injection amount.

Description

technical field [0001] The present invention relates to an air-fuel ratio learning control device for an internal combustion engine, comprising: a fuel injection valve that injects fuel into an intake passage; an oxygen sensor that detects the concentration of residual oxygen in exhaust gas flowing through an exhaust passage; and a throttle valve that It controls the amount of intake air circulating in the intake passage; a throttle sensor, which detects the opening of the throttle valve, that is, a throttle opening; a rotational speed sensor, which detects the engine rotational speed; a control unit, which is based on the oxygen sensor . The detection value of the throttle sensor and the rotational speed sensor is used to control the fuel injection amount injected from the fuel injection valve, wherein the control unit determines a The fuel ratio becomes the basic fuel injection amount of the target air-fuel ratio, and the feedback compensation coefficient determined based on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/30
CPCY02T10/42Y02T10/40
Inventor 大西谦太田中弘志岛田信弘永露敏弥高野祐纪
Owner HONDA MOTOR CO LTD
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