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Method for determining cam molded line and cam

A cam, height technology, applied in valve details, valve actuation, etc., to solve problems such as engine performance degradation

Inactive Publication Date: 2021-03-12
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The maximum lift of the valve determines the intake and exhaust capacity of the engine cylinder. If the maximum lift of the valve is simply reduced to reduce the vibration and noise when the valve is lifted and seated, the performance of the engine will be reduced.

Method used

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  • Method for determining cam molded line and cam
  • Method for determining cam molded line and cam
  • Method for determining cam molded line and cam

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Embodiment Construction

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0061] As the requirements for engine power and economy become higher and higher, more and more engine cam profiles are designed with high-order functions. High-order function design The engine cam profile means that the function corresponding to the motion acceleration curve of the valve is a high-order function. In addition, there are other ways to design the cam profile, such as designing directly for the cam profile, but the cam profile obtained by designing ac...

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Abstract

The invention provides a method for determining a cam molded line. The height of a valve buffer section is determined according to all known parameters of a valve mechanism. According to the preset buffer section speed, the constant acceleration section wrap angle, the constant speed section wrap angle and the determined height of the valve buffer section, the constant acceleration section coefficient and boundary displacement corresponding to the height of the valve buffer section can be determined. According to the known parameters and the determined constant acceleration section coefficientand boundary displacement, a function relationship between the cam angle in the cam buffer wrap angle range and corresponding tappet displacement is determined so as to determine the cam buffer wrapangle molded line. According to a preset cam lift wrap angle molded line, a cam closing wrap angle molded line and the determined cam buffer wrap angle molded line, the cam complete molded line is determined. Due to the fact that the valve buffer section is arranged, on the basis that the total lift of a valve does not need to be reduced, noise generated when the valve is opened and seated is reduced.

Description

technical field [0001] The invention relates to the technical field of gas distribution of internal combustion engines, in particular to a method for determining a cam profile and the cam. Background technique [0002] NVH is the English abbreviation of noise, vibration and harshness (Noise, Vibration, Harshness). The NVH problem is a comprehensive problem to measure the quality of automobile manufacturing. It gives the most direct and superficial feeling to car users. Therefore, the NVH problem is one of the concerns of the international automobile industry, including major vehicle manufacturers and parts companies. . According to statistics, about 1 / 3 of the failures of the whole vehicle are related to the NVH problem of the vehicle, and nearly 20% of the research and development costs of major companies are spent on solving the NVH problem of the vehicle. For a car, NVH problems exist everywhere. According to the source of the problem, it can be divided into three parts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/08
CPCF01L1/08
Inventor 曹江怀余伟徐亚飞周君张德定
Owner CHERY AUTOMOBILE CO LTD
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