Micro-hybrid System for the VW Golf

Wolfsburg, 20. March 2018

A gasoline engine, as there was previously no: full VW announces the new 1.5 TSI ACT Bluemotion with 130 HP. And rightly so, because the unit comes with several technical world firsts. But above all, the gasoline should be as economical as a Diesel.

Cylinder shut-off and "coasting with engine-Off"

Those familiar with VW, for the acronym ACT is nothing New. It stands for Active Cylinder Management Technology, which you can easily translate with cylinder deactivation At low load, the Motor puts two of the four cylinders still. The gabs already with the predecessor engine, 1.4 TSI, but the 1.5 TSI ACT Bluemotion can do even more: as soon As the driver releases the Gas or the car rolling downhill, is switched off, the TSI is complete. In addition, the engine is disconnected by Opening the clutch so that it does not have to be dragged along. This so-called sailing is particularly fuel-efficient. The System uses in addition to the Twelve-Volt on-Board network, a Lithium-ion battery, the on-Board electronics powered while the engine-Out-of-Phase with energy.

Miller-cycle and variable turbine geometry

But that's not all. The unit also works according to the Miller combustion process. This innovative controlled combustion leads to a ten percent improvement in efficiency. Since the Opening times of the intake valves in the Miller-cycle is shorter, it must be realized that the cylinder filling via the increased boost pressure. To do this, Volkswagen uses a turbocharger with variable turbine geometry (VTG) – a technology that was previously only available from diesel engines and sports cars such as the Porsche 911 Turbo is known. During a normal turbo system directs a portion of the exhaust gas flow through a Wastegate valve on the Turbine pass, is directed in the case of a VTG turbocharger, always the entire exhaust gas flow through the Turbine. So no energy is lost and the fuel consumption decreases.

Only 0.1 Liter less fuel consumption

And what's the point? The 1.5 TSI ACT Bluemotion with 130 HP is currently in the Golf and Golf Variant. The standard fuel consumption of the Golf with DSG is according to the official price list 4.8 liters per 100 kilometers. This is just a tenth of a litre Savings compared to the 150 PS strong Golf 1.5 TSI ACT DSG (without free-wheeling engine, Miller cycle and VGT). And at 20 HP less power. The full statement is "to be as economical as a Diesel" is at least questionable: The 150-HP 2.0 TDI in Golf comes from according to the data sheet with 4.4 liters. Maybe VW wants to develop the principle further. Derivatives with fewer cylinders and smaller displacements to be conceivable, say, the wolf Burger, as well as Mild, Full and Plug-In Hybrid and natural gas drives.(sl)