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Control method and control device for vehicular internal combustion engine

A control method and technology for an internal combustion engine, applied in engine control, fuel injection control, internal combustion piston engine, etc., can solve problems such as insufficient target lean air-fuel ratio

Active Publication Date: 2020-07-14
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If an electric intake supply device such as an electric compressor is used as such an intake supply device for lean combustion, the motor rotation speed decreases and the air supply is relatively lean relative to the target air-fuel ratio when the state of charge of the battery is insufficient. Insufficient, the actual air-fuel ratio may be lower than the target lean air-fuel ratio

Method used

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

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Embodiment Construction

[0017] Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

[0018] figure 1 A system configuration of an internal combustion engine 1 as an embodiment of the present invention is shown. In this embodiment, both the electric supercharger 2 and the turbocharger 3 are used as the supercharging unit.

[0019] The internal combustion engine 1 is, for example, a 4-stroke cycle spark ignition gasoline internal combustion engine, and in particular, can be switched to a stoichiometric combustion mode in which a target air-fuel ratio is set near a stoichiometric air-fuel ratio (that is, an excess air ratio λ=1), and a lean air-fuel ratio (for example, near λ=2) is a lean-burn mode configuration of the target air-fuel ratio.

[0020] In the exhaust passage 6 of the internal combustion engine 1, the exhaust turbine 4 of the turbocharger 3 is arranged, and on the downstream side of the exhaust turbine 4, for example, an upstream catalyt...

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Abstract

In the present invention, an internal combustion engine (1) is provided with an electric supercharger (2) driven by an in-vehicle battery and can switch between a stoichiometric combustion mode, in which the vicinity of a theoretical air-fuel ratio is used as a target air-fuel ratio, and a lean combustion mode, in which a lean air-fuel ratio is used as the target air-fuel ratio. In a part (L2) ofa lean combustion operation range (L) which is to be in the lean combustion mode, the electric supercharger (2) bears a part of the air intake volume. When operation is continuing in the second lean combustion operation range (L2) and the state of charge (SOC) is equal to or less than a lower-limit value (SOClim), the electric supercharger (2) is stopped and a forced switch is made to the stoichiometric combustion mode. Because of this, the air-fuel ratio changes in a stepwise manner, so worsening of NOx due to operation at an intermediate air-fuel ratio is avoided.

Description

technical field [0001] The present invention relates to a control method and a control device for a vehicle internal combustion engine capable of switching between a stoichiometric combustion mode in which a target air-fuel ratio is set near a stoichiometric air-fuel ratio, and a lean burn mode in which a lean air-fuel ratio is set as a target air-fuel ratio. A control method and a control device for a vehicle internal combustion engine that require the operation of an electric intake air supply device under some operating conditions in a lean burn mode. Background technique [0002] In order to reduce fuel consumption, there is known an internal combustion engine capable of switching between a stoichiometric combustion mode in which a stoichiometric air-fuel ratio is set as a target air-fuel ratio, and a lean burn mode in which a lean air-fuel ratio is set as a target air-fuel ratio. In such an internal combustion engine, it is preferable to set the lean burn mode under a w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D23/00F02D41/04
CPCF02D2200/503F02D41/1475F02B39/10F02D41/0007F02D41/3076F02B37/04F02M26/06F02B37/162F02D41/3064F02D23/00F02D41/04F02D2041/001F02D2250/21
Inventor 越后亮
Owner NISSAN MOTOR CO LTD
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