Volkswagen Commercial Vehicles will present the Caddy TGI—the first vehicle in its segment to be equipped with a CNG drive system and a DSG dual-clutch gearbox—at the Geneva Motor Show. The Caddy TGI BlueMotion is a family/city delivery van that runs on either CNG or bio-natural gas. Both the panel van and passenger car variant of the Caddy can also be ordered with a short wheelbase or in the Caddy Maxi version.
With combined natural-gas consumption of 4.1 kg and 4.3 kg per 100 kilometers (short wheelbase and Caddy Maxi, respectively), Caddy drivers can achieve a range of approximately 630 km (391 miles), or 860 km (534 miles), in the pure gas mode. The CO2 emissions of the Caddy TGI amount to 112 g/km in the short-wheelbase version and 116 g/km in the Caddy Maxi version in combination with the six-speed manual gearbox, and 123 g/km and 126 g/km, respectively, with DSG (provisional data).
The new Caddy and Caddy Maxi TGI BlueMotion are equipped with high-pressure tanks mounted under the floor, thereby preserving cargo space: up to 3,200 l in the Caddy and up to 4,130 l in the Caddy Maxi. The models are also equipped with a 13-liter gasoline tank.
The canister-shaped steel gas tanks are filled with CNG compressed to more than 200 bar. The four underfloor tanks mounted in the Caddy with a short wheelbase hold 26 kg of natural gas; the Caddy Maxi TGI is equipped with five tanks that hold 37 kg.
The tanks power a 1.4-liter TGI engine that fulfills the requirements of the new EU 6 emissions standard. The engine is based on a new TSI gasoline unit that was modified to enable the Caddy to run on compressed natural gas. Among other things, the cylinder head, valve train, crank drive, pistons, lines and valves were all adapted to the requirements for a natural-gas drive.
The developers also made adjustments to the engine controller, catalytic converter and turbocharger. This natural-gas drive compatibility was taken into account in the early stages of development of the TSI gasoline engine series.
Maximum torque of 200 N·m is produced by the TGI engine in the Caddy between 1,500 and 3,500 rpm. The engine achieves its maximum output of 81 kW or 109 hp at 4,800 - 6,000 rpm. The Caddy TGI as a city delivery van or passenger car has a top speed of 174 km/h (108 mph) with a manual gearbox and 172 km/h (107 mph) with DSG.
Normally, the quasi-monovalent gas drive system in the Caddy TGI BlueMotion only uses gasoline when the engine is started and warmed up at temperatures below minus 10 degree Celsius. However, this gasoline mobility reserve can also be used if none of the more than 900 CNG filling stations in Germany or the approximately 4,200 such stations which now operate in Europe happen to be in the immediate vicinity.
The previous model was available as a CNG Caddy under the name Ecofuel, and the TGI engine has been available for ordering with the fourth generation of the Caddy with a manual gearbox since mid-2015. The new Caddy TGI with DSG will arrive at dealerships at the beginning of June 2016.