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Control method and control device for vehicle internal combustion engine

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

Active Publication Date: 2022-06-24
NISSAN MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
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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 vehicle internal combustion engine
  • Control method and control device for vehicle internal combustion engine
  • Control method and control device for vehicle 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 accompanying drawings.

[0018] figure 1 The system configuration of the internal combustion engine 1 as an embodiment of the present invention is shown. This embodiment is a structure in which the electric supercharger 2 and the turbocharger 3 are simultaneously used as the supercharging unit.

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

[0020] An exhaust turbine 4 of a turbocharger 3 is arranged in an exhaust passage 6 of the internal combustion engine 1 , and an upstream-side cata...

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Abstract

The internal combustion engine (1) has an electric supercharger (2) driven by an on-vehicle battery, and can be switched 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 model. In a part ( L2 ) of the lean-burn operation region (L) in which the lean-burn mode needs to be set, the electric supercharger ( 2 ) bears a part of the intake air amount. If the state of charge (SOC) is less than or equal to the lower limit value (SOClim) while continuing to operate in the second lean-burn operation region (L2), the electric supercharger (2) is stopped, and the stoichiometric combustion mode is forcibly switched . As a result, the air-fuel ratio is changed stepwise, so that NOx degradation due to operation at an intermediate air-fuel ratio can be 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 to a stoichiometric combustion mode in which a target air-fuel ratio is set near a stoichiometric air-fuel ratio and a lean combustion mode in which a lean air-fuel ratio is set as the target air-fuel ratio, and in particular to a control device. A control method and a control device for a vehicle internal combustion engine that require 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 are known internal combustion engines capable of switching between the stoichiometric combustion mode in which the stoichiometric air-fuel ratio is set as the target air-fuel ratio, and the lean combustion mode in which the lean air-fuel ratio is set as the target air-fuel ratio. In such an internal combustion engine...

Claims

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Application Information

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Patent Type & Authority Patents(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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