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The Audi A3 Sportback g tron showcases state of the art CNG The engine in the Audi A3 Sportback g tron is based on the •€ k– drive technolog  starting with the fuel storage ts two tanks ‚— TˆS ˜odiifcations were ade to the c linder head turbo under the luggage copartent lfoor can each hold  2 kg of charging in‘ection s ste and the catal tic converter ™eveloping CNG at a a­iu 2€€ bar pressure referred to ‚ƒ C š‚ k– ‡‚‚€ hp‹ and 2€€ N of tor’ue the Audi A3 Sportback n keeping with Audi…s ultra lightweight construction principle g tron has a top speed of ‚•€ kph with € to ‚€€ kph taking eleven each tank weighs 2  kg less than its conventional steel counter seconds The ifve door odel consues on average less than part The CNG tanks ade fro an enhanced plastic atri­ A 3ƒ kg per ‚€€ k of CNG C“ tailpipe eissions are less than 2 gas ipereable pol aide pol er fors the inner la er while •ƒ gras per k in gas ode a second la er of carbon ifber reinforced pol er ‡Cˆ‰Š‹ gives the tank its e­treel high strengthŒ a third la er of glass ifber rein forced pol er ‡Gˆ‰Š‹ provides protection against e­terior daage Žigh strength epo­ resin is used to bind the ifbre reinforced aterials The electronic gas pressure regulator reduces the high pressure of the gas lfowing fro the CNG tanks down to around ifve to nine bar in two stages This ensures that the right pressure is alwa s present in the in‘ector rail and at the in‘ector valves f the pressure in the CNG tanks drops below the re’uired level the engine an ageent s ste autoaticall switches to petrol operation After e media refueling and whenever it is ver cold the engine is started with petrol initiall  then it switches over to CNG This SSŠ contains ž‰ codes which ou can use to access additional interactive content see page 3• 621 004 Learning objectives of this self study programme This Self Stud Šro