The refreshed version of the Mazda CX-7 will have a unique selling point when it is launched later this year – it will be the first passenger vehicle from a Japanese manufacturer to include a urea selective catalytic reduction (SCR) system.
When the new system is combined with Mazda’s newly developed MZR-CD 2.2 litre turbo-diesel engine the amount of nitrogen oxides produced from the car will be vastly reduced.
The engine’s diesel particulate filter includes a Mazda developed catalyst activation mechanism meant to enhance the removal of soot. The new catalytic combustion treatment process enables the diesel particulate filter to burn off soot at a rate approximately 60 per cent faster than current systems.
The engine, which will also be featured in the Mazda 6, has 295lb-ft of torque and improved fuel efficiency thanks to updated fuel injectors and a lower compression ratio.
With the fuel pressure inside the common rail increased, the injection nozzles are smaller and the minimum injection interval is shorter too. Therefore the fuel spray pattern is more accurate meaning that the fuel injection timing, frequency, particle size and volume can all be optimally controlled. This results in lower fuel consumption and less soot generated in the exhaust.
Mazda will introduce the urea SCR later this year along with the new-look CX-7.
