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Length-variable connecting rod, engine and connecting rod length control method

A control method and engine technology, applied in the direction of engine control, machine/engine, connecting rod, etc., can solve problems such as low reliability and complex structure, and achieve the effects of improving reliability, simple structure, and eliminating knocking

Active Publication Date: 2022-02-18
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing ways to change the length of the connecting rod are to adjust the structural length of the connecting rod through a hydraulic device, or to adjust the length of the connecting rod by adding an operating mechanism. These length adjustment forms have the disadvantages of complex structure and low reliability.

Method used

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  • Length-variable connecting rod, engine and connecting rod length control method
  • Length-variable connecting rod, engine and connecting rod length control method
  • Length-variable connecting rod, engine and connecting rod length control method

Examples

Experimental program
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Embodiment 1

[0042] This embodiment relates to a variable-length connecting rod, which is generally used in automobile engines, and is used for the transmission connection between the piston and the crankshaft in the engine, and the connecting rod of this embodiment is adjustable by setting its length It can change its own length according to the operating conditions of the engine, especially the engine knocking condition, so that the length of the connecting rod can be shortened when knocking occurs to help eliminate knocking, and when there is no knocking The length of the connecting rod is elongated, which is beneficial to improve the running performance of the engine.

[0043] In terms of overall structural design, the connecting rod in this embodiment includes a first connecting rod body, a second connecting rod body and a locking mechanism. Wherein, one end of the first connecting rod body is connected with one end of the second connecting rod body by sliding insertion, and is constr...

Embodiment 2

[0064] This embodiment relates to an engine, and the connecting rod with variable length in Embodiment 1 is provided between the piston and the crankshaft of the engine, and the external control signal described in Embodiment 1 generally comes from the engine Controller (i.e. engine ECU).

[0065] In this embodiment, by adopting a variable-length connecting rod, the length of the connecting rod can be shortened when the engine knocks, thereby helping to eliminate knocking, and when there is no knocking, the length of the connecting rod can be extended , which in turn helps to improve engine performance.

[0066] At this point, in this embodiment, the control of the length of the connecting rod to achieve the above-mentioned effects includes the following methods:

[0067] a. When the controller detects the engine knock signal, it locks the first connecting rod body 1 in the retracted position;

[0068] b. When the controller detects that there is no engine knock signal, it l...

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Abstract

The invention provides a variable-length connecting rod, an engine with the variable-length connecting rod and a connecting rod length control method. The connecting rod comprises a first connecting rod body, a second connecting rod body and a locking mechanism, and one end of the first connecting rod body is connected with one end of the second connecting rod body in a sliding and inserted mode and restrained in the second connecting rod body; the length of the connecting rod can be telescopically changed along with relative sliding between the first connecting rod body and the second connecting rod body, and due to the fact that the second connecting rod body limits the inserting end of the first connecting rod body, the first connecting rod body is provided with an extending position in an extending state relative to the second connecting rod body and a contracting position in a contracting state relative to the second connecting rod body; the locking mechanism is arranged on the second connecting rod body, the locking mechanism is provided with a locking end and responds to an external control signal, and the locking mechanism acts to lock the first connecting rod body at the extending position or the retracting position through the locking end. The length of the connecting rod can be changed, and the connecting rod is simple in implementation form and structure and good in practicability.

Description

technical field [0001] The invention relates to the technical field of engine compression ratio adjustment, in particular to a length-adjustable connecting rod. The present invention also relates to an engine with the above-mentioned connecting rod, and a method for controlling the length of the connecting rod. Background technique [0002] The compression ratio of an automobile engine is the main parameter affecting the fuel consumption, power and thermal efficiency of the engine. Generally speaking, under the same adjustment, the higher the thermal efficiency of the engine, the lower the fuel consumption and the stronger the power performance. However, a high compression ratio will also bring Disadvantages of engine knocking. At the same time, at different engine speeds, the corresponding knock critical compression ratios are different, and usually the higher the engine speed, the lower the corresponding critical value, while the existing engine compression ratios are gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B75/04F02D15/02F02D35/02F16C7/06
CPCF02B75/045F02D15/02F02D35/027F16C7/06
Inventor 马卫平曹永伟胡洪涛魏云腾李艳利王红丹任亚南李鹏飞王琦王子川张安鑫冯贝贝
Owner GREAT WALL MOTOR CO LTD