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Input date:	Friday, April 23, 2010	Last update:	Friday, April 23, 2010
Deadline:	Wednesday, April 20, 2011
Type of profile:	TO
Title:	Active exhaust silencer for internal combustion engine
Abstract:	A Flemish University (Belgium) has developed an active exhaust silencer for internal combustion engines. Compared to a passive exhaust system, the active silencer reduces noise up to 13 dB, requires less space and consumes less energy. The research group is looking for technical collaboration to further industrial development of the silencer. In conjunction, a cold engine test rig as well as a design and modeling tool are offered for new silencer co-development projects.
Description:	The active exhaust system consists of an electrically driven valve, mounted in series with a buffer volume. The exhaust system is capable of attenuating the exhaust sound by 13 dB (4 dBA), as measured on a cold engine test setup. The mean backpressure to the engine remains below 10 kPa. The electrical power consumption is only 5W. Electrical analogue models, including the engine acoustic characteristics, were developed for silencer design purposes. A cold engine test rig was developed with similar characteristics as an operational engine. The test rig allows developing new concepts of exhaust systems economically. The prototype active silencer has been validated on the cold engine test rig using different control strategies. The research group has a well-estabished research experience and a world reputation in noise and vibraton engineering. The group is looking for technical collaboration to further development of the silencer. In conjunction, the cold engine test rig as well as the design and modelling tool are offered to new silencer co-development projects. Innovative Aspects: 1)In contrast to the known active exhaust systems so far, this system is able to attenuate the exhaust noise without passive attenuation prior to the active silencer. 2) The silencer volume is smaller than the volume of a passive silencer with similar noise attenuation properties. 3) The active silencer is capable of reducing very low frequency noise at large exhaust gas volume velocities, which is particularly beneficial for large engines with low rotational velocity. 4) The efficiency of the engine will be improved, resulting in a reduction of fuel consumption. 5) Integration of sound design into the active silencer is possible, for example for engines with cylinder deactivation. Current Stage of Development --------------------------- Development phase - Laboratory tested RTD programme --------------------------- National Programmes Intellectual Property Rights --------------------------- Secret know-how The university is the owner of the technology. Organisation/Company Type --------------------------- Research institute/University Organisation/Company Size --------------------------- > 500 Application Domain(s) --------------------------- Market Applications --------------------------- MA Keywords: Industrial trucks and tractors; Power transmission equipment (including generators and motors); Other industrial equipment and machinery; Industrial Services; Motor vehicles, transportation equipment and parts; MA Keyword Codes: 008003004; 008003006; 008003007; 008006; 009001005; MA Highlights: Combustion engines in general: car, truck and ship engines, stationary engines like generators, pumps,... Collaboration Type --------------------------- Joint further development; Testing of new applications; Engineering; Collaboration Comments --------------------------- - Type of partner sought: industry - Specific area of activity of the partner: automotive, combustion engines, stationary engines like generators, pumps,... - Task to be performed: The active silencer has been demonstrated on the cold engine test setup. For further development, collaboration with a partner is necessary to assist for the next stage of development, which should result in an active silencer for an operational combustion engine. The partner has to be able to assist for the technological aspects of the active silencer, such as material selection against high temperature and corrosion. Also assistance is needed for testing, such as reliability and durability. Country of origin --------------------------- Belgium
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