DieselNet UPDATE December 2003 Mazda launching DPF-equipped light Bongo truck
Mazda Motor Corporation has introduced a new diesel engine and a diesel particulate filter (DPF) system to its Mazda Bongo van and truck range. It is the first light commercial vehicle to employ a DPF system. The new Mazda Bongo vans are the first light commercial vehicles to comply with Japan's New Short-term Diesel Emissions Regulations (2003/2004) and the Automobile NOx/PM Control Law, making them eligible for sale and registration in Japan's major metropolitan areas. The new 2.0-liter inline four cylinder, common-rail direct injection turbo diesel engine (RF-CDT type, based on the MZR-CD engine from the EU specification Mazda6) delivers improved performance compared to the previous 2.2-liter diesel engine. Maximum output has been increased from 58 kW @4,250 rpm to 63 kW @3,500 rpm. Maximum torque has been enhanced by around 30% from 138 Nm @2,000 rpm to 178 Nm @2,000 rpm. Comparing the fuel efficiency (10.15 mode) of a manual front-wheel drive, wide-low long body truck, the new 2.0-liter diesel engine achieves a 6.49 l/100km compared to the previous 2.2-liter diesel engine's 7.35 l/100km. PM emissions have been reduced by 75%, while NOx emissions have been cut by 25% compared to the 2.2-liter diesel engine (R2 type) previously used in the Bongo series. In order to reduce PM emissions, the engine employs a DPF coated with an oxidation catalyst. The filter is automatically regenerated through the combined effect of the catalyst and increased combustion temperature, controlled by the common-rail injection system. The DPF utilizes an Si-SiC wall-flow monolith substrate (NGK). NOx emissions are reduced through the use of cooled exhaust gas recirculation (EGR) and by improving combustion efficiency with fuel injected at high pressure from the common-rail. http://www.mazda.com/publicity/public/200312/1209e.html December 9, 2003 'Mazda Bongo' First in Class to Employ Diesel Engine with DPF - Cleaner emissions, qualifies for registration in Tokyo, Osaka and Nagoya - Mazda Motor Corporation has partially restyled its Mazda Bongo van and truck range with the introduction of a newly developed diesel engine designed to greatly reduce exhaust emissions. The upgraded vehicles go on sale today at Mazda, Mazda Anfini and Mazda Autozam dealers throughout Japan. Mazda Bongo vehicles equipped with the new diesel engine are the first in their class*1 to comply with Japan's New Short-term Diesel Emissions Regulations and the Automobile NOx/PM Control Law*2 making them eligible for sale and registration in the major metropolitan areas of Tokyo, Osaka and Nagoya. Moreover, performance and fuel economy show a significant improvement over the previous diesel engines used in the Bongo series. With the introduction of this engine Mazda actively responds to customer demands by providing a clean, yet powerful and responsive diesel engine with enhanced fuel economy. These features ensure that Bongo commercial vehicles continue to be the ideal business partner. Additional enhancements for the Bongo van/truck lineup include a more powerful gasoline engine, revised seat and door trim fabric and a driver's seatbelt with pretensioner and load limiter. Mazda Bongo Van GL-Super Features of the New Diesel Engine 1) Cleaner emissions (Complies with New Short-term Diesel Emissions Regulations and the Automobile NOx/PM Control Law) The new 2.0-liter inline four cylinder, common-rail direct injection turbo diesel engine (RF-CDT type) employs technology that greatly reduces the amount of particulate matter (PM) and nitrogen oxides (NOx) in exhaust gas emissions. Based on the MZR-CD engine mounted in the European specification Mazda6, the engine is equipped with an all-new diesel particulate filter (DPF) and an improved engine control unit. As a result, PM emissions have been reduced by more than 75 percent, while NOx emissions have been cut by 25 percent compared to the 2.2-liter diesel engine (R2 type) previously used in the Bongo series. In order to reduce PM emissions, the engine employs a diesel particulate filter coated with an oxidation catalyst. The ceramic filter traps PM, and when the amount of PM in the filter reaches a designated level, it is automatically removed through the combined effect of the catalyst and combustion temperature controlled by the common-rail injection system. Further, NOx emissions are reduced by optimally controlling the combustion temperature with "Cooled EGR"*3 and by improving combustion efficiency with fuel injected at high pressure from the common-rail. As a result, Mazda Bongo is the first vehicle in its class to comply with Japan's New Short-term Diesel Emissions Regulations and the Automobile NOx/PM Law. 2) Improved performance (maximum torque increased by around 30%) The new engine employs a common-rail direct injection system with precision-controlled fuel injection pressure and injection timing along with a small, high efficiency turbocharger. Together these features greatly improve vehicle performance compared to the previous 2.2-liter diesel engine. In addition, the engine achieves flat torque over all speed ranges, while readily delivering the power required for climbing hills with a load. Maximum output has been increased from 58 kW (79 PS)/4,250 rpm to 63 kW (86 PS)/3,500 rpm. Maximum torque has also been enhanced by around 30 percent from 138 N-m (14.1 kg-m)/2,000 rpm to 178 N-m (18.2 kg-m)/2,000 rpm. 3) Fuel economy improved by almost 13 percent The common-rail direct injection system and small, high efficiency turbocharger work together to deliver an impressive balance of power and fuel economy. Comparing the fuel efficiency (10.15 mode) of a manual front-wheel drive, wide-low long body truck, the new 2.0-liter diesel engine achieves a respectable 15.4 km/L compared to the previous 2.2-liter diesel engine's 13.6 km/L. *1: Small commercial vehicles. (maximum load less than 1 ton) *2: Outline of regulations: New Short-term Emissions Regulations: These regulations set standards for CO and HC emissions in addition to NOx and PM emissions. They will apply to current production models from September 2004. Automobile NOx/PM Control Law: Effective in major cities with serious levels of air pollution caused by automobile exhaust emissions, this law regulates permitted levels of emissions for all commercial vehicles and passenger cars with diesel engines. The law applies in Tokyo, Chiba, Kanagawa, Aichi, Mie, Osaka and parts of Hyogo. When introduced in October 2002 the law related only to newly registered vehicles. However, from October 2003 all designated vehicles registered in these regions must comply after a certain grace period. *3: EGR stands for Exhaust Gas Recirculation. The system works by returning exhaust gas to the intake air lowering the maximum combustion temperature to reduce the amount to NOx produced. Cooled EGR further increases this effect by water-cooling the exhaust gas before recirculation. 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