Variable-geometry turbochargers (VGTs), occasionally known as variable-nozzle turbochargers (VNTs), are a type of turbochargers, usually designed to allow the effective aspect ratio (A/R ratio) of the turbocharger to be altered as conditions change.

In diesel engines, this flexibility can be used for improving low speed torque characteristics, reducing turbocharger lag and driving EGR flow. The most common designs of variable geometry turbochargers include the pivoting vane design and the moving wall design. An alternative to the fixed geometry turbine is the variable geometry turbine.

Garrett’s variable geometry VNT technology has been matched to more than 70 million diesel engines in the last three decades. The turbo’s advanced design helps manufacturers boost car and light commercial vehicle engine performance, increasing fuel efficiency, reducing emissions, enhancing drivability and improving packaging flexibility.

The Holset VGT™ from Cummins Turbo Technologies pioneered Variable Geometry (VG) technology for the commercial vehicle market in 1998. Featuring a patented sliding nozzle ring, the Holset VGT offers a wide flow range that allows …

In a nutshell, variable geometry turbochargers (VGT) are combining the benefits of a small A/R ratio and a large A/R ratio into one unit, bringing together the advantages of both types. Variable geometry turbochargers means variable A/R ratios.

2022年3月17日 · So, what is a variable geometry turbocharger? The purpose of a variable geometry turbocharger is to maximize the amount of pressure you have across your rev range. It is the next generation of turbocharger technology, using variable vanes to control exhaust flow against the turbine blades.

2021年9月7日 · VGT涡轮增压器的优点有：可提升增压压力和增压器响应速度、达到最大扭矩对应的转速更低、发动机MAP中有更多工况增压器介入工作，提高发动机热效率等。 现在的发动机通过废气涡轮增压器进行强制进气，提升了进入气缸内的空气密度，从而达到小排量大功率的目的。 虽然发动机在全负荷状态时排气能量非常可观，但当发动机在低负荷低转速时，排气能量很小，涡轮 …

2014年7月31日 · Variable geometry turbochargers work on the principle of aspect ratio adjustment, essentially varying the ratio of exhaust inlet width to turbine size. This can work in a variety of ways in a variety of designs, but they essentially achieve the same purpose- varying the aspect ratio of the turbine according to rpm levels and desired boost pressure.

2001年1月5日 · A turbocharger with new structure has been developed for passenger car applications, the RHF series Variable Geometry System (VGS) turbocharger. The object of VGS turbocharger is to improve engine performance, over a broad engine speed range, by changing the swallowing capacity of turbine with a variable geometry nozzles.

2021年1月16日 · VGT (Variable Geometry Turbine) are a family of Turbo Technology. The objective is to better guide the exhaust flow depending on operating conditions. Even if commonly used in Diesel, VGT for gasoline is still not mass market but clearly a major current trend at most of OEMs (VW, Ford, Porsche.