Variable connecting rod type VCR engine connecting rod mechanism

Abstract

The invention discloses a variable connecting rod type VCR engine connecting rod mechanism. A connecting rod in the connecting rod mechanism is achieved by a piston structure controlled hydraulically to stretch and retract. The length of the connecting rod is adjusted by adjusting the hydraulic pressure so that the purpose of dynamically changing the compression ratio can be achieved. The variable connecting rod type VCR engine connecting rod mechanism has the advantages that a new compression ratio adjusting means is provided, the adjustable states are various, the adjusting action is rapid in response, a complex mechanical transmission device is not needed, the structure is simple, and cost is low.

Description

technical field [0001] The invention relates to a variable compression ratio engine, in particular to a variable link type VCR engine link mechanism. Background technique [0002] The core of VCR (Variable Compression Ratio) technology is to dynamically change the cylinder compression ratio according to the engine operating conditions, and maintain a higher compression ratio under low-load conditions to reduce fuel consumption and exhaust emissions; In high-load conditions, a lower compression ratio is used to control "knock" and ensure engine reliability; VCR technology, as the engine technology with the most potential to improve fuel economy, has attracted more and more attention from the industry in recent years. [0003] Existing engines based on VCR technology generally adjust the compression ratio by changing the stroke of the connecting rod; the existing problems are: the mechanical device used to adjust the stroke of the connecting rod has a complex structure and...

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Problems solved by technology

[0003] Existing engines based on VCR technology generally adjust the compression ratio by changing the stroke of the connecting rod; the existing problems are: the mechanical device used to adjust the stroke of the connecting rod has a complex structure and many components, and due to the structural stability of the engine The requirements are very high, which leads to the high cost of this type of VCR engine; due to the complexity of the compression ratio control mechanism and the slow real-time response of the mechanical device itself, it is difficult for the existing VCR engine to cope with the sudden change of the engine condition. Control requirements, the control effect is poor, and because the engine working conditions change very frequently in actual operation, the mechanical device is easy to wear; at the same time, the mechanical device also has the problem of limited adjustable state

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