1
what’s the use?
By varying the structure of the engine, the compression ratio can be varied within a certain range, the most suitable compression ratio different switching conditions, optimum thermal efficiency. To reduce fuel consumption, engine performance and achieve enhance fuel economy.
2
advantages
· improve the thermal efficiency of the engine, improved fuel economy of the engine.
· help reduce emissions. · Can improve the operating stability of the engine.
– apply polyhydric fuel driven.
3
Related Art
Nissan VCR the variable compression ratio technique
Nissan VCR engine with a crank pin of the lever to change the compression ratio achieved. In the original and additional thrust crank set and a VCR control shaft linkage mechanism. Wherein VCR link mechanism constituted by the lever and its crank pin one end of a control shaft connecting link. When the control shaft is rotated, the control shaft will drive the connecting rod rotary crank pin, and the rocking lever occurs. Whereby it causes the top dead center position of the pistonIt appears to move up and down to achieve a variable compression ratio.
The variable compression ratio Saab SVC techniques
The engine head structure through Saab We redesigned using a new cylinder head integrated embodiment, the cylinder head and the cylinder block are connected together via a hydraulic control member, rather than bolts. SVC engine generally consists of two parts, wherein the cylinder head, a piston, a valve assembly we can call the first portion; and the link, we see it as a second portion of the crankcase. Like the conventional engine, a crankcase located below the model remains stationary with the engine running, the portion above the cylinder and the piston, as will be the center of the crankshaft, by means of a hydraulic thrust generating means is rotated, so that the combustion chamber volume changes happened. However, since the engine is divided into two parts, upper cylinder also requires a cooling system, the cooling system oil passage connected to the cylinder, and sealed with a rubber member, the rubber member can be long should the reciprocating work, because it can easily by fatigue cracking force occurs, and thus cause the entire cooling gallery leak.
4
Further reading
[123 ]
2016 Infiniti introduced a new VC-T2.0T inline four-cylinder engine. Depending on the operating conditions, this new model compression ratio may be 8: 1 to freely adjust the interval, in order to improve the combustion efficiency of the engine at different conditions, to achieve reduced fuel consumption: 1-14. And this engine is the world’s first mass-produced variable compression ratio engine.