Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fail-safe control apparatus for internal combustion engine equipped with variable valve characteristic mechanism and method thereof

A valve characteristic and fault protection technology, applied in electrical control, mechanical equipment, engine control, etc., can solve problems such as unstable combustion, insufficient air intake, and deterioration of handling performance

Inactive Publication Date: 2005-03-09
HITACHI LTD
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case where a failure occurs when the valve lift amount is set to the minimum lift amount, if control is performed so that the generation amount on the intake valve on the normal side coincides with the lift amount on the failure side, There is a possibility that the amount of intake air is insufficient, the combustion becomes unstable, the handling performance deteriorates, and in the worst case, the engine stops

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
  • Fail-safe control apparatus for internal combustion engine equipped with variable valve characteristic mechanism and method thereof
  • Fail-safe control apparatus for internal combustion engine equipped with variable valve characteristic mechanism and method thereof
  • Fail-safe control apparatus for internal combustion engine equipped with variable valve characteristic mechanism and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] exist figure 1 Among them, in the intake pipe 102 on the upstream side of the V-shaped internal combustion engine 101 equipped with the fail-safe control device according to the present invention, an electronically controlled throttle (ETC) 104 for driving the throttle 103b is provided, and the ETC 104 passes The throttle motor 103a is turned on and off.

[0020] Intake manifolds 105 and 106 branched from the intake pipe 102 are respectively connected to the cylinder banks on the left and right side bodies formed in a V shape. Then, the air that has passed through the ETC 104 and the intake manifolds 105 and 106 is drawn into each combustion chamber 108 through the intake valve 107 of each cylinder. A spark plug 109 is mounted on each combustion chamber 108 . Furthermore, a fuel injection valve 200 is provided for each cylinder.

[0021] Combusted exhaust gas is exhausted from each combustion chamber 108 via each exhaust valve 110 , then purified by a catalytic conve...

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

When it is detected that any one of a plurality of variable valve characteristic mechanisms disposed for every cylinder groups is failed, an effective opening degree (valve lift amount, valve operating angle or the like) in a valve characteristic in the failed state, is obtained. When the effective opening degree is judged to be a predetermined value or above, the valve characteristic of the normal variable valve characteristic mechanism is controlled to be coincident with the valve characteristic in the failed state. When the effective opening degree is judged to be less than the predetermined value, there is performed a control for limiting the control to coincide the valve characteristic of the normal variable valve characteristic mechanism with the valve characteristic in the failed state.

Description

technical field [0001] The present invention relates to a technique wherein, in an internal combustion engine equipped with variable valve characteristic mechanisms, each variable valve characteristic mechanism changes the valve characteristics related to the effective opening degree of the engine valve, and when the variable valve characteristic mechanism fails When performing fail-safe control. Background technique [0002] Japanese Unexamined Patent Publication No. 4-63922 discloses a technique in which, in a V-type internal combustion engine equipped with a variable valve characteristic mechanism, the variable valve characteristic mechanism is provided for each cylinder group in a V-shaped On each side body (bank), the variable valve characteristic mechanism includes a low-speed cam and a high-speed cam, and switches the valve characteristics according to the engine operation. When the variable valve characteristic mechanism of one cylinder group fails, the other cylinde...

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): F02D13/02F01L13/00F02D41/22
CPCF01L2201/00F01L13/0026F01L2800/00F01L2013/0073
Inventor 町田宪一清水博和
Owner HITACHI LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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