On April 15, 2013, Cummins unveiled its new four-cylinder small off-highway engine at the baumaMunich exhibition, the QSF 3.8-liter series, which meets the strictest off-highway requirements in Europe and America through the addition of selective catalytic reduction (SCR) systems. The mobile equipment emission standard (Tier4Final/StageIV), power 85-132 hp (63-98 kW), has become a new benchmark for compact four-cylinder engines in the industry with superior power, durability and operating cost advantages. Cummins' Tier 4 Final/Stage IV full-electric four-cylinder small engine has been extended to 2.8, 3.8 and 4.5 litres, and the power range covers 49 to 173 hp (37 to 129 kW).
The QSF3.8Tier4Final emission technology route adopts a new type of SCR system to increase the conversion efficiency of nitrogen oxides (NOx) at lower temperatures under the effect of ultra-efficient catalysts, requiring only low-dose diesel emission treatment fluid (DEF/AdBlue). Can reduce NOx emissions. At the same time, the in-cylinder purging reduces particulate emissions without the need to install a diesel oxidation catalyst (DOC) or particulate filter (DPF).
QSF3.8 uses a more efficient SCR system, reduces cooling exhaust gas recirculation and its corresponding engine cooling demand (ie, reduces engine heat dissipation), reduces engine load, highlights the power advantage of QSF3.8, with 132 hp ( The outstanding power of 98 kW leads the market. The SCR system is produced at the Cummins Emissions Processing Plant. More than 1 million units are currently in use.
"QSF3.8 is an excellent choice for upgrading Tier4Final stage of compact construction machinery and equipment. Compared with engines of the same size, it is more powerful and more economical and durable." said Hugh Foden, Executive Director of Cummins Off Highway Business. Said, "With the further upgrade of emissions, construction machinery and equipment put forward higher requirements for the installation convenience of engines and aftertreatment devices. The simpler the structure, the smaller the space occupation and the more popular. QSF3.8Tier4Final's SCR aftertreatment solution, This advantage is fully reflected."
The size and weight of the QSF3.8 engine are comparable to those of the smaller QSB3.3. Although the displacement is larger, the Tier4Final has continued its fuel economy advantage. The fuel consumption is comparable to the initial stage of the QSB3.3Tier4Interim, and the power is increased. 10%, peak torque increased by 18%. A compact and efficient Cummins wastegate turbocharger with a maximum torque of 488 Newton meters (360 pound-feet).
QSF 3.8 also conducts field conditions tests on the most severe cycling conditions and application conditions to ensure that the new QSF 3.8 is perfectly matched with the host equipment and put on the market before the final standard of the fourth phase of Europe and the United States. European Off-Highway Phase IV (EUStage IV) emission standard will take effect in October 2014 for 75-173 hp (56-129 kW) range engines, and the US EPA Tier4Final Ultimate Standard will be in January 2015. Effective.
QSF 3.8 was jointly built by the technical team of Cummins Europe, China, and the United States. It shares a basic design with the ISF vehicle engine and is a globally-oriented, forward-looking, off-highway engine platform. To date, 160,000 units of ISF have been operating in Russia, China, South America, and the Middle East, and have been widely recognized for their superior reliability and durability over similar products.
Small amount of light, high intensity and more stable
With a high-intensity design, the cylinder pressure peak is comparable to the larger displacement QSB 4.5, making it easy to operate, with excellent reliability, durability, higher operating income, and high added value, improving the utilization of residual value of engineering equipment.
Taking advantage of the Cummins QSB 4.5 design, the rear gearbox drive train provides higher mounting stiffness and reduces noise.
High-strength cast iron cylinders are etched to maintain maximum strength while reducing their own weight.
The use of high-quality composite materials for valve body covers and oil pans, etc., lighter weight, higher power to weight ratio.
Easy to work, low maintenance and more reliable
Competent for a long period of high-intensity operations, less maintenance needs.
The electronic control system can be installed remotely, making fault diagnosis and data download faster.
Using Cummins direct-flow air filter (DirectFlow), small size, large capacity of ash, long filter replacement period (equivalent to more than twice the normal replacement period of air filter), through the built-in smart sensor to monitor the air temperature and pressure, Ensure good air intake system operation.
Using high-pressure common rail fuel system (HPCR), through precise control of the entire electronic control system, fuel economy is higher and more reliable.
Two-stage fuel filtration is used to effectively protect the injector from contamination. The removal of large particles in the fuel by Cummins' latest NanoNetTM media filter separator can remove nearly 99% of the 5 micron particles in the fuel, prolonging the life of the fuel filter. , filtration efficiency is higher.
The crankcase ventilation system effectively prevents air leakage and ensures engine cleanliness. With a patented design, the crankcase and the camshaft are connected together and maintenance-free.
The engine lubricating oil pump, driven by the crankshaft, replaces the traditional camshaft drive and is small and compact. The noise is lower at cold start and the oil flow is better.
The compact cooling system module integrates the water pump, oil filter and oil cooler to improve pressure management and reliability.
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