Engine with variable compression ratio

Abstract

The invention discloses a variable compression ratio engine, including a cylinder body (1) internally provided with a cylinder, a piston (2), a connecting rod (3) and a crankshaft (4), wherein, the piston (2) is arranged in the cylinder, the connecting rod (3) is linked with the crankshaft (4) and the piston (2), the cylinder body (1) is also provided with a mechanism which can change the effective length of the connecting rod (3), and two ends of the mechanism are respectively linked with the connecting rod (3) and the crankshaft (4). The mechanism which can change the effective length of the connecting rod is a retractable hydraulic lever mechanism and controlled by a hydraulic pump controlled by ECU and a triple valve. The variable compression ratio engine has the following advantages that the compression ratio can be continuously changed and the change is controllable; the structure is simple; the control strategy is relatively simple; and the dynamic property and the fuel economy of the engine can be effectively improved.

Description

technical field [0001] The invention relates to the field of engines, in particular to an automobile engine whose compression ratio is variable. Background technique [0002] With the increasingly stringent emission regulations and customers' requirements on engine economy, improving the engine's emission performance and fuel economy performance has become the biggest difficulty faced by traditional internal combustion engines. The main methods focus on two aspects: aftertreatment and combustion optimization. The former is to purify outside the engine through remedial measures, and the latter is to purify inside the engine by changing the internal structure of the engine. At present, very gratifying results have been achieved in the aspect of external purification, such as SCR, DPF, etc., which can meet the standards of Euro 5 or Euro 6. In terms of internal purification, there are now many new combustion models, such as HCCI, MK and NADI systems. These new combustion mode...

AI Technical Summary

Problems solved by technology

Chinese patent application No. 88101975.5 discloses a variable compression ratio device for variable connecting rod length of internal combustion engine. Ratio changes, which are reflected between several strokes of the internal combustion engine, and are uncontrollable, and cannot provide flexible fuel engines with compression ratios that adapt to different fuels

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