“In a CNG mode, a purify expostulate in a g-tron models already undercuts a extent values of destiny glimmer standards. Independent institutes have reliable that,” emphasized Peter Mertens, Member of a Board of Management of AUDI AG for Technical Development. Mertens believes CNG-powered models will continue to occupy a pivotal purpose within a Audi portfolio: “For us, g-tron with e-gas is some-more than merely a bridging technology, it is a bound member in a destiny plan on choice drives.”
The vehicle manufacturer extended a operation of g-tron models only a few weeks ago. With a new A4 Avant g-tron and A5 Sportback g-tron, a reward code proposes an choice for a midsize category. The A3 Sportback g-tron has already been on a marketplace given 2014.
The new A4 Avant g-tron and A5 Sportback g-tron are powered by a 2.0 TFSI engine handling according to a rarely efficient, Audi-optimized “B cycle” explosion principle. Overall, a engineers used 29 new components and materials, and practiced a appetite section so that it also runs optimally on gas. The pistons and valves have been specifically mutated and concede for an optimal application ratio. The turbo engine produces 125 kW (170 hp). Its limit torque of 270 Newton meters (199.1 lb-ft) is accessible during 1,650 rpm. An electronic controller reduces a high vigour of a gas issuing from a tank from as most as 200 bar to a operative vigour of 5 to 10 bar in a engine. This operation is achieved boldly and precisely in response to a appetite requested by a driver. The scold vigour is always benefaction in a gas line and during a injector valves – low vigour for fit pushing in a reduce speed range, and aloft vigour for some-more appetite and torque.
The engine was tested in impassioned feverishness conditions and had to withstand rebate 35 degrees in Scandinavia. Additional facilities were grown to strengthen a components compulsory for CNG operation from cold temperatures. These forestall a gas valves from frozen up, for instance. To safeguard well-spoken regulating in high summer temperatures, a developers done modifications generally to components for a gasoline mode. For example, they came adult with a immaculate steel valve to strengthen a high-pressure injection valve for gasoline. The member might feverishness adult to as most as 400 ˚C as a outcome of a CNG explosion process.
All in all, Audi engineers have achieved forlorn potency in CNG engines by these measures. In a NEDC, a Audi A4 Avant g-tron with discretionary S tronic consumes only 3.8 kilograms of CNG per 100 kilometers, analogous to CO2 emissions of 102 grams per kilometer (164.2 g/mi). In gasoline mode, a total are 5.5 liters per 100 kilometers (42.8 US mpg) and 126 grams of CO2 per kilometer (202.8 g/mi). The total for a A5 Sportback g-tron with S tronic are matching in CNG mode. When regulating on gasoline, it consumes 5.6 liters per 100 kilometers (42.0 US mpg) and emits 126 grams of CO2 per kilometer (202.8 g/mi). Both models accelerate from 0 to 100 km/h (62.1 mph) in 8.4 seconds. The A4 Avant g-tron reaches a tip speed of 221 km/h (137.3 mph), a A5 Sportback g-tron 224 km/h (139.2 mph).
The altogether operation of a new midsize models is 950 kilometers (590.3 mi) – including adult to 500 kilometers (310.7 mi) on CNG alone. This fuel is stored in 4 tanks that are distributed space-efficiently by a rearward structure. There is also a gasoline tank with a ability of 25 liters (6.6 US gal). Fuel costs compared with an homogeneous gasoline engine are most lower, during around 4 euros per 100 kilometers (62.1 mi) (Germany, as at: Sep 2017). The reduce CO2 emissions also meant owners compensate rebate in engine vehicle tax.
The g-tron models are generally eco-friendly when regulating on Audi e-gas. Compared to a gasoline-powered vehicle in a same opening class, their CO2 emissions are 80 percent** lower. That means no additional costs for a customer: As a customary offering, Audi will supply a immature fuel Audi e-gas for 3 years for all g-tron business who place an sequence by May 31, 2018.
Customers can fill adult their g-tron indication during any CNG stuffing hire and compensate a unchanging price. By feeding a computed volume of Audi e-gas into a healthy gas grid, Audi works behind a scenes to safeguard a immature advantages of a program, including a analogous rebate in CO2 emissions.
Audi produces a fake e-gas regulating renewable appetite from H2O and CO2 or from organic residual materials such as straw and plant clippings. This routine takes place in a possess power-to-gas trickery in Werlte in Lower Saxony (Emsland), among other venues. During a production, Audi e-gas binds accurately a volume of CO2 issued by a car.
* Figures count on a tires/wheels used and on a delivery version
** In pristine e-gas mode (CNG) with a well-to-wheel research (a life cycle comment that includes fuel prolongation and normal pushing of a automobile), in comparison with an homogeneous indication in a same opening category with a required gasoline engine