Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF11 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com