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Control device and control method for internal combustion engine

A technology of internal combustion engine control, internal combustion engine, applied in the direction of engine control, fuel injection control, internal combustion piston engine, etc.

Inactive Publication Date: 2014-01-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, the engine speed increases contrary to the driver's intention, so the driver may experience a strange feeling

Method used

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  • Control device and control method for internal combustion engine
  • Control device and control method for internal combustion engine
  • Control device and control method for internal combustion engine

Examples

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no. 1 example

[0045] will refer to Figure 1 to Figure 3 A specific first embodiment of the internal combustion engine control device according to the aspect of the present invention is described. It should be noted that the internal combustion engine according to the present embodiment is a vehicle-mounted internal combustion engine (hereinafter, an internal combustion engine) 10 that directly injects fuel into cylinders.

[0046] figure 1 A schematic configuration of the internal combustion engine 10 according to the present embodiment is shown. Intake passage 22 and exhaust passage 18 are connected to combustion chamber 12 of internal combustion engine 10 .

[0047] A throttle valve 26 is arranged in the intake passage 22 . Throttle valve 26 is actuated by throttle motor 24 to open or close. Furthermore, a surge tank 28 is provided on the intake downstream side of the throttle valve 26 in the intake passage 22 . Then, the opening degree of the throttle valve 26 is changed to adjust ...

no. 2 example

[0079] will refer to Figure 4 with Figure 5 An internal combustion engine control device according to a second embodiment of the present invention will be described.

[0080] The present embodiment is the same as the first embodiment in that when the state of charge SOC of the battery 80 is higher than or equal to a predetermined value, when the estimated degree of fuel mixing D is higher than or equal to a predetermined degree Dth, it is prohibited to use Charging control for charging the battery 80 at the voltage V2. However, the present embodiment differs from the first embodiment in that the voltage Valt generated by the alternator 70 is set to a maximum value V3 (for example, 16V) within a settable range. It should be noted that other configurations are basically the same as those of the first embodiment, so repeated explanations are omitted below.

[0081] Next, we will refer to Figure 4 A processing procedure for setting the voltage generated by the alternator 70 i...

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Abstract

An electronic control unit (60) for an internal combustion engine (10) that includes an engine-driven alternator (70) diagnoses on the bases of an air-fuel ratio correction amount in air-fuel ratio feedback control whether a rich abnormality that the air-fuel ratio of air-fuel mixture is excessively rich is occurring in a fuel injection system. When the state of charge of a battery (80) charged with electric power generated by the alternator (70) is higher than or equal to a predetermined value, charging control for setting a voltage generated by the alternator (70) at a voltage (V2) lower than a normal generated voltage is executed. When the state of charge of the battery (80) is higher than or equal to the predetermined value, charging control for charging the battery (80) at the voltage (V2) is prohibited when a degree of mixing of fuel in lubricating oil of the internal combustion engine (10) is higher than or equal to a predetermined degree.

Description

technical field [0001] The present invention relates to a control device and a control method for diagnosing whether a rich abnormality in which the air-fuel ratio of an air-fuel mixture of an internal combustion engine is too rich is occurring in a fuel injection system based on an air-fuel ratio correction amount in air-fuel ratio feedback control. Background technique [0002] In an internal combustion engine, air-fuel ratio feedback control is performed on a fuel injection amount so that an actual air-fuel ratio becomes the same as a target air-fuel ratio (for example, a stoichiometric air-fuel ratio). Here, when some kind of abnormality occurs in a fuel injection system such as a fuel injection valve, the actual injection amount, which is the amount of fuel actually injected and supplied, may significantly exceed the target injection amount. In this case, the actual air-fuel ratio is richer than the target air-fuel ratio, which may result in deterioration of exhaust per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D41/22F02D41/08
CPCF02D41/22F02D2250/24F02D2250/08Y02T10/40F02D41/1495F02D2250/11F02D41/08F02D45/00
Inventor 前村纯广渡诚治
Owner TOYOTA JIDOSHA KK