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Control device for internal combustion engine

A technology for controlling equipment and internal combustion engines, applied in mechanical equipment, engine control, fuel injection control, etc., can solve problems such as inappropriate correction of fuel injection amount, and achieve the effect of proper fuel injection amount and proper correction

Inactive Publication Date: 2008-03-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it may not be appropriate to correct the fuel injection amount based on the learned value

Method used

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  • Control device for internal combustion engine
  • Control device for internal combustion engine
  • Control device for internal combustion engine

Examples

Experimental program
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Effect test

no. 1 example

[0052] Fig. 1 schematically shows the configuration of an engine system controlled by an engine ECU (Electronic Control Unit), which is an internal combustion engine control device according to a first embodiment of the present invention. Although FIG. 1 shows an inline four-cylinder gasoline engine, the application of the present invention is not limited to the shown engine, and the present invention can be applied to various types of engines such as V-type six-cylinder engines, V-type eight-cylinder engines, and the like.

[0053] As shown in FIG. 1 , engine 10 includes four cylinders 112 connected to a common surge tank 30 via corresponding intake manifolds 20 . The surge tank 30 is connected to an air cleaner 50 via an intake pipe 40 . An airflow meter 42 and a throttle valve 70 driven by an electric motor 60 are provided in the intake pipe 40 . The opening position of the throttle valve 70 is controlled independently of the accelerator pedal 100 based on an output signal...

no. 2 example

[0098] Referring to Figs. 10 to 12, a second embodiment of the present invention will be described. This embodiment differs from the previously described first embodiment in that the already calculated learning values ​​are used to set learning values ​​in other learning areas. Since this embodiment is otherwise the same as the previously described first embodiment and has the same functions, its detailed description will not be repeated.

[0099] A control structure of a program executed in engine ECU 300 serving as the control device for the internal combustion engine according to the present embodiment will be described with reference to FIG. 10 .

[0100] At step (hereinafter, step is abbreviated as S) 100, engine ECU 300 identifies an injection region based on a map showing DI ratio r in FIGS. 2 and 3 . At S202 , engine ECU 300 identifies a learning area based on the intake air amount detected by airflow meter 42 .

[0101] At S204 , engine ECU 300 detects the air-fuel ...

no. 3 example

[0118] Referring to Fig. 13 and Fig. 14, a third embodiment of the present invention will be described. In the present invention, the DI ratio r is calculated using a map different from that of the previously described first embodiment.

[0119] In other respects, since the configuration, processing flow, and functions thereof are the same as those in the foregoing first embodiment, detailed description thereof will not be repeated.

[0120] Referring to FIG. 13 and FIG. 14 , each map representing the fuel injection ratio between in-cylinder injector 110 and intake manifold injector 120 as information on the operating state of engine 10 will be described below. . These maps are stored in the ROM 320 of the engine ECU 300 . FIG. 13 is a map for a warm state of the engine 10 , and FIG. 14 is a map for a cold state of the engine 10 .

[0121] Fig. 13 and Fig. 14 are different from Fig. 2 and Fig. 3 in the following points. In the region where the engine speed of the engine 10...

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Abstract

An engine ECU executes a program including the steps of: detecting an air-fuel ratio; calculating a learn value of a feedback correction amount for total fuel injection amount calculated based on the air-fuel ratio, for a plurality of learning regions obtained as a result of division corresponding to an intake air amount; interpolating the learn value at an intake air amount different from the intake air amount detected at the time of calculation of the learn value, based on the calculated learn value; and correcting an amount of fuel injection based on the obtained learn value.

Description

technical field [0001] The present invention relates to a control apparatus for an internal combustion engine including a first fuel injection mechanism (in-cylinder injector) that injects fuel into a cylinder and a second fuel injection mechanism that injects fuel into an intake manifold or an intake port (Intake Manifold Injector); More specifically, the present invention relates to a technique for correcting the amount of fuel injected from a first fuel injection mechanism and a second fuel injection mechanism. Background technique [0002] There is known an internal combustion engine provided with an intake manifold injector for injecting fuel into an intake manifold and an in-cylinder injector for continuously injecting fuel into a combustion chamber, wherein, when the engine load is lower than a preset Stop fuel injection from the intake manifold injector when the load is set, and allow fuel injection from the intake manifold injector when the engine load is higher tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02D41/3094F02D41/1454F02D41/2454F02D41/2416F02D41/2461F02D41/2445
Inventor 木野濑贤一田原龙也
Owner TOYOTA JIDOSHA KK
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