|Nissan X-TRAIL 20GT.|
Nissan Motor Co. launched the new diesel X-TRAIL 20GT in Japan, first shown as a prototype earlier this year. (Earlier post.) The vehicle, which goes on sale 18 September, meets Japan’s stringent Post New Long-term Regulations.
Compared to the current Japan emissions regulations which went into effect in 2005, the Post New Long-Term Regulation reduces NOx by 47% to 0.08 g/km and PM by 64% to 0.005 g/km. CO and HC levels remain the same. The new regulations come into effect for new model vehicles in October 2009.
|NOx and PM Standards, g/km|
|Japan 2009||US T2B5||Euro 5|
|* For diesel passenger vehicles|
By comparison, existing US Tier 2 Bin 5 regulations call for NOx emissions of 0.04 g/km (0.07 g/mi) and PM emissions of 0.006 g/km (0.01 g/mi) over the full lifetime of the vehicle. Euro 5 regulations, which also go into effect in 2009, call for diesel car NOx emissions of 0.18 g/km and PM emissions of 0.005 g/km.
The new version of the 2.0-liter M9R diesel engine delivers power equivalent to a 3.5-liter V6 gasoline engine, generating maximum power of 127 kW (170 hp) at 3,750 rpm and maximum torque of 360 Nm (266 lb-ft) at 2,000 rpm. The engine provides high torque at low rpm and delivers ample performance in any driving situation, according to Nissan.
The X-TRAIL 20GT has a fuel-efficiency rating of 15.2 km/L (6.58 L/100km, 35.8 mpg US) under Japan’s 10-15 test mode operation, representing an increase of approximately 30% in fuel economy over a 2.5-liter gasoline engine with the same power output.
|Swirl flows are accelerated by placing the exhaust and intake ports in opposed positions. Click to enlarge.|
Nissan co-developed the M9R engine with Alliance partner Renault (the Renault version is the 2.0 dCi), and first introduced it in Europe in 2007. The basic M9R engine employs a 1,600 bar common rail system and high-precision piezoelectric injectors that respond up to four times faster than conventional devices; variable geometry turbocharger; double swirl ports; EGR cooler; and a periodic-regeneration diesel particulate filter.
By positioning the inlet and exhaust ports in opposition, a double swirl effect is created, which improves distribution of the air/fuel mixture for enhanced combustion efficiency. The EGR cooler reduces engine-out NOx by reducing the combustion temperature. A Lean NOx trap (LNT) catalyst system further reduces the NOx levels.