DE3870778D1 - WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES. - Google Patents

WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES.

Info

Publication number
DE3870778D1
DE3870778D1 DE8888113362T DE3870778T DE3870778D1 DE 3870778 D1 DE3870778 D1 DE 3870778D1 DE 8888113362 T DE8888113362 T DE 8888113362T DE 3870778 T DE3870778 T DE 3870778T DE 3870778 D1 DE3870778 D1 DE 3870778D1
Authority
DE
Germany
Prior art keywords
plants
conducting
gas
dynamic pressure
combustion engines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE8888113362T
Other languages
German (de)
Inventor
Raymond Dr Freymann
Albrecht Keck
Anton Haas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE8888113362T priority Critical patent/DE3870778D1/en
Application granted granted Critical
Publication of DE3870778D1 publication Critical patent/DE3870778D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/18—Silencing apparatus characterised by method of silencing by using movable parts having rotary movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/165—Silencing apparatus characterised by method of silencing by using movable parts for adjusting flow area

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

Gases from a multicylinder engine (1) are led through a chamber (8) which may be a combined absorption/reflection silencer. Between this and a catalytic converter (9), the flow through an intermediate tubular section (4) is throttled by a rotary valve (10) operated by a stepper motor (12) in a control circuit (13). An angular position sensor (15) associated with the crankshaft supplies signals to a compensatory network (17), which receives inputs also from the ignition circuit (18) and a reference cylinder TDC sensor (19). The position of the stepper motor (12) is detected (16) and fed back to the compensatory network (17).
DE8888113362T 1987-09-15 1988-08-17 WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES. Expired - Lifetime DE3870778D1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8888113362T DE3870778D1 (en) 1987-09-15 1988-08-17 WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3730890 1987-09-15
DE8888113362T DE3870778D1 (en) 1987-09-15 1988-08-17 WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES.

Publications (1)

Publication Number Publication Date
DE3870778D1 true DE3870778D1 (en) 1992-06-11

Family

ID=6336010

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8888113362T Expired - Lifetime DE3870778D1 (en) 1987-09-15 1988-08-17 WORKING METHOD FOR SOUND ABSORPTION IN GAS-CONDUCTING PLANTS WITH DYNAMIC PRESSURE VARIATIONS IN THE FLOW MEDIUM, ESPECIALLY IN EXHAUST SYSTEMS OF COMBUSTION ENGINES.

Country Status (3)

Country Link
EP (1) EP0307639B1 (en)
DE (1) DE3870778D1 (en)
ES (1) ES2031968T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8928052D0 (en) * 1989-12-12 1990-02-14 Lotus Group Plc Control of pressure vibrations in ducts
FR2808916B1 (en) * 2000-05-11 2003-08-15 Jean Laurent Peube ELECTROAEROACOUSTIC SOURCE AND SYSTEM FOR ACTIVE NOISE CONTROL
DE10030490B4 (en) * 2000-06-21 2005-07-21 Dr.Ing.H.C. F. Porsche Ag Exhaust system for an internal combustion engine
US7243623B2 (en) 2005-07-05 2007-07-17 Arvin Technologies, Inc. Velocity control of exhaust valve actuation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR360413A (en) * 1905-10-31 1906-04-21 Louis T Weiss Improvements in exhaust pipes
US2320668A (en) * 1941-08-15 1943-06-01 Harry A Smith Mechanical exhaust silencer
SE447290B (en) * 1985-03-19 1986-11-03 Volvo Ab DEVICE NOISE MEASURING MEASUREMENT THROUGH A GAS STAINLESS STEEL VALVE CONTROL VALVE

Also Published As

Publication number Publication date
EP0307639A1 (en) 1989-03-22
EP0307639B1 (en) 1992-05-06
ES2031968T3 (en) 1993-01-01

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee