Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for fault detection of engine valve mechanism

A technology for valve train and fault detection, which is applied to engine components, combustion engines, engine control, etc., and can solve problems such as failure to detect engine valve train faults.

Active Publication Date: 2021-07-20
WEICHAI POWER CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a method and device for detecting a fault in an engine valve train to solve the problem that a fault in an engine valve train cannot be detected in the prior art

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
  • Method and device for fault detection of engine valve mechanism
  • Method and device for fault detection of engine valve mechanism
  • Method and device for fault detection of engine valve mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077] As mentioned in the background section, in the prior art, the gas distribution mechanism may be abnormal, but there is no detection method capable of detecting the failure or abnormality of the gas distribution mechanism to remind the user that the gas distribution mechanism needs to be adjusted.

[0078] Based on this, the inventor found through research that when the engine is running, because the radius of curvature corresponding to each crankshaft angle at each speed is different, the corresponding inertial force of the valve train is also different.

[0079] The force on the camshaft follower is the dynamic oscillating force caused by the static valve spring force, the inertial force of the valve train and the gas load.

[0080] When the vehicle where the engine is located is in reverse dragging condition, the gas load on the intake camshaft follower is small, and the change of static valve spring force has little influence on the force of the camshaft follower, so ...

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

The present application provides a method and device for fault detection of an engine valve mechanism, wherein, in the method for detecting a fault of an engine valve mechanism, the camshaft The first relationship curve of the change of the force of the driven member with the crankshaft angle of the engine is compared with the predetermined target relationship curve, so as to determine whether the valve mechanism is faulty. That is to say, in this application, the normal target relationship curve is compared with the first relationship curve of the engine to be detected, so as to obtain the result of whether the valve mechanism is faulty. If there is a fault, it will be detected and used to alarm and remind the user to configure The air mechanism is abnormal and needs to be adjusted.

Description

technical field [0001] The invention relates to the technical field of engine fault detection, in particular to a fault detection method and device for an engine valve mechanism. Background technique [0002] The camshaft is an important component of the engine's valve train, which plays the role of timing opening and closing the intake and exhaust valves of each cylinder. The valve mechanism directly affects the overall performance of the engine through the valve timing. The torsional stiffness of the camshaft will affect the dynamic characteristics of the valve train. So far, various studies on the cam mechanism have assumed that the cam takes a constant angular velocity ω as the motion input. The variation is still too great to maintain the above assumptions. [0003] The gas distribution timing mainly depends on the motion characteristics of the gas distribution camshaft. In addition to the influence of the cam profile, the torsional vibration of the gas distribution c...

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 Patents(China)
IPC IPC(8): F02D41/22F01L1/047F01L1/46
CPCF01L1/047F01L1/46F02D41/22Y02T10/40
Inventor 史美丽翟长辉黄国龙王炳成
Owner WEICHAI POWER CO LTD