Audi A4 Avant g-tron is sporty yet extremely efficient and cost-effective vehicle. The engine is based on the new 2.0 TFSI unit with advanced process very efficient combustion, developed by Audi. Unit, turbocharging, delivers the highest performance of 125 kW (170 hp). The maximum torque of 270Nm is available from about 1650 min -1. To run on natural gas have been specifically modified pistons and valves that allow optimal compression ratio. Electronic control unit reduces the high pressure gas from the fuel tank (200 bar) at a working pressure of 5-10 bar in the engine. This function steering pressure occurs dynamically and precisely, depending on the performance required řidičem.Zemní gas is due to the supply line and injectors always correct pressure - low pressure for efficient drive at lower speeds or high blood pressure, essential for achieving higher performance and torque.
Audi A4 Avant g-tron uses mixed-mode EU almost four kilograms of CNG (compressed natural gas - CNG) per 100 kilometers, which correspond to the fuel costs of about 104 CZK (at an average price of about 26 CZK / kg of CNG in October 2015). CO2 emissions are less than 100 grams per km. Reservoirs can hold a total of 19 kg of CNG, allowing the range of over 500 kilometers. If the amount of remaining gas fall below 0.6 kilograms - this corresponds to a residual pressure of 10 bars - enters the controller mode combustion of petrol. Dual Audi A4 Avant g-tron can in this mode to overcome another 450 kilometers. The overall range is comparable with a car driven by a motor TDI.
Filling tanks for natural gas and gasoline are placed under a common cap. After refueling, and in very cold weather, the engine is running in the petrol, but soon transferred to the combustion of natural gas. Two displays in the instrument cluster informs the driver about the current state of fuel in the tanks. Driver information system displays the fuel consumption in the active mode of operation.
Audi assembles four cylinder tanks CNG as a compact module into the back of the Avant model. Tanks are adjusted disposable space and each has specific dimensions. The tanks are stored in a protective case made of sheet steel and secured by straps, to protect them from damage, for example by kerbstones. During production of the A4 Avant g-tron is mounted in the body the entire module CNG tanks, which also includes the tank 25 liters of petrol. The car has a recess for the spare wheel. The battery is also moved from the luggage compartment in the engine compartment. The floor of the luggage compartment is at the doorstep, so it retained full-fledged space for luggage.
CNG tanks with a working pressure of 200 bar at 15 ° C correspond to the philosophy of lightweight construction Audi - thanks to its innovative arrangement are 56 percent lighter than comparable steel tanks. The inner layer is composed of a gastight polyamide, followed by the layer combining composites reinforced with carbon and glass fibers, to ensure the highest degree of strength. The third layer consists exclusively of a composite reinforced with fiberglass and serves mainly simple visual inspection because the damaged areas obtain a milky white color. In the production of each tank before installation in the vehicle tested pressure of 300 bar. The pressure causing the rupture of the shell, is still much higher and significantly exceeds regulatory requirements.
When using gas Audi e-gas operation has the Audi A4 Avant g-tron neutral balance of CO2 emissions. Audi e-gas is a synthetic methane produced in several závodechz CO2 and water using electricity from renewable sources. Audi operates in Werlteprvní conversion plant electricity to gas on an industrial scale in the world, but now receives e-gas from other devices. The brand with the four rings technology enables the conversion of electrical energy to a gas store surplus energy from renewable sources and significantly contributes to the implementation of the transition to the power produced in a sustainable way. Audi with its partners, is working intensively on the development of synthetic fuels collectively referred Audi e-fuels, while also using the new technologies on a biological basis.
Source: tz
