MANN+HUMMEL introduces new acoustic filters to save space in the air intake system
The gas-fired four-cylinder turbocharged engine requires the same amount of gas combustion as a six-cylinder naturally aspirated engine. In order to minimize pressure loss, the intake manifold must be increased in cross section, but the cross section is too large and will result in higher intake. Gas noise. According to this feature , MANN+HUMMEL, an international parts supplier, developed a filter that not only saves space by eliminating bulky resonators, but also achieves the same high-efficiency noise reduction effect as resonators.
MANN+HUMMEL New Filters
The working principle of the filter
The MANN+HUMMEL filter system changes the diameter of the intake manifold. The section of the intake manifold is adjusted by the injection holes in the intake system to provide the best airflow for the engine at all times.
For optimal functionality, MANN+HUMMEL engineers designed two tubes. The separation wall divides the typical single intake manifold into two air inlets, one of which is in an always open state, thus providing the engine with a minimum amount of air; in the second air inlet, by the spray The orifice regulates the required air flow, and the pressure difference before and after the orifice is skillfully used to achieve the effect that it can be operated without external stimulation. When only a small amount of gas is needed, the engine speed is lower and the orifices are closed because the first inlet already provides enough gas. If the engine speed increases, for example by accelerating to achieve high speed operation, a pressure difference will be formed before and after the injection hole, the injection hole will gradually open, and gas will enter the engine through the second air inlet. When running at full speed, the spray hole is fully open and the air flow can freely enter the cylinder.
Lower noise
With the sound filter, the amount of air in the engine can reach the optimum level. Through the variable section of the intake manifold, intake noise will be low. The acoustic filter can actually reduce the individual noise peaks, especially when the engine is running at a low speed, which has been verified on the MANN+HUMMEL drum test stand. In addition, the new design saves more than 2.5 liters of installation space by eliminating resonators in the engine compartment.
As the design of the car becomes more compact, the installation space in the engine room will develop toward miniaturization. In addition, the customer's requirement for car noise is also increasingly strict. Therefore, MANN+HUMMEL's technology of reducing engine noise through the variable section of the intake pipe will have a wide application prospect.
About MANN+HUMMEL Group
The MANN+HUMMEL Group is dedicated to the development and supply of original ancillary equipment for the international automotive and construction machinery industries. Currently, the MANN+HUMMEL Group has approximately 13,000 employees in 41 regions around the world. In 2010, the company’s turnover exceeded 2 billion euros (in 2009 it was 1.67 billion euros). In the automotive industry, MANN+HUMMEL products include multifunctional plastic air filtration systems, intake manifold systems, liquid filtration systems, air conditioning filters and cylinder head covers, and filter cartridges for after-sales service and maintenance of vehicles. In general engineering, process engineering and industrial manufacturing, MANN+HUMMEL's product range includes industrial filters, a range of products that reduce the carbon emissions of diesel engines, membrane filters for water treatment, filtration systems, and material handling systems. equipment. For more information about MANN+HUMMEL please visit and.
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Changzhou Fuku Precision Machinery Co., Ltd. , https://www.fukuindustrial.com