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
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
  • F01N13/087—Other arrangements or adaptations of exhaust conduits having valves upstream of silencing apparatus for by-passing at least part of exhaust directly to atmosphere
• • 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
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
  • F02B27/04—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues in exhaust systems only, e.g. for sucking-off combustion gases
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the invention relates to a method and means for increasing the output of an internal combustion engine by intermittently generating low pressure pulses in the exhaustsilencer system of the engine.
• turbo-units function by the exhaust gas pressure driving a turbine wheel which in turn is used to compress the fuel-air mixture in the suction phase.
• this results in an increase in exhaust gas reaction-pressure, which has a negative influence on the running of the engine.
• turbo-units are extremely expensive and the costs are hardly justified by the extra power gained, at least not for an ordinary motorist.
• the turbo usually only gives extra power at an already high power, and entails greatly increased fuel consumption.
• the object of the present invention therefore is to achieve a method permitting increased output for a normal internal combustion engine, without intervention in the engine itself and which can also be used to save fuel.
• the invention also relates to a means for performing the method according to the invention, said means being suitable for sale as a spare part and/or accessory and is thus fitted to engines already in use.
• the invention also relates to a means for performing the method according to the invention, comprising a cylindrical pipe with connections at each end for fitting into a conventional exhaust-silencer system, as well as a spiral element arranged in the pipe, the gap being arranged between the edges of the spiral element and the inner surface of the pipe.
• the means also comprises a pipe provided with counterweight-loaded flap, by-passing a rear silencer, if any.
• the pipe with the spiral element and the gap surrounding it form a turbulence unit and this turbulence unit is intended to replace the conventional front silencer in an exhaust-silencer system.
• the turbulence unit is preferably arranged at a certain minimum distance from the branch pipe of the engine. This distance is preferably ca. 2 meter.
• the area of the gap is 5 - 10 % of the total through-flow area for the exhaust gases in the turbulence unit.
• Fig. 1 shows an exhaust-silencer system of conventional type with the arrangement according to the invention fitted
• Fig. 2 shows a longitudinal section along the line II II in Fig. 3,
• Fig. 3 shows a cross section along the line III - III in Fig. 2,
• Fig. 4 shows a schematic cross-sectional view in a conventional cylinderpiston arrangement in an internal combustion engine
• Fig. 5 shows a power-speed diagram, the unbroken lines indicating the output of an internal combustion engine with conventional exhaust system and the broken line the output of an engine with an exhaust system comprising a turbulence unit and by-pass pipe.
• Fig. 1 shows an exhaust-silencer system of conventional type with branch pipe 1 , front silencer 2 and rear silencer 3.
• the front silencer consists of a turbulence unit according to the invention, there being no direct external differences.
• the turbulence unit preferably has the same external dimensions as a conventional silencer, so that it can easily be fitted into a standard system.
• the lenght of the pipe 4 between the branch pipe 1 and the turbulence unit is significant to the function of the device, as will be explained further in the following.
• a pipe 5 is arranged to by-pass the rear silencer 3, the end of this pipe being partially closed by a counterweight-loaded flap 6.
• the function of the flap will also be described below.
• the construction of the turbulence unit can be seen in Figs. 2 and 3. It consists of a cylindrical pipe 11 with connections 12, 13 at each end. A helically twisted sheet-metal element is arranged centrally in the pipe 14, secured by point welding, for instance. The helical element is preferably turned two revolutions. A gap 15 is arranged between the inner surface of the pipe 11 and the edges of the spiral element 14.
• FIG. 4 shows a schematical cross section through the cylinderpiston arrangement of an ordinary petrol-fueled internal combustion engine with cylinder 21, piston 22, combustion chamber 23, sparking plugs 24, branch pipe 25, suction valve 26 and exhaust valve 27.
• the function of the turbulence unit is thus to extremely quickly accelerate the exhaust gases and then utilize the vacuum or partial vaacum occurring when the exhaust valve closes after the gases have been released from this cylinder. Once the engine is running, what is termed a standing wave of alternating high and low pressure which be formed.
• both suction valve 26 and exhaust gas valve 27 When a cylinder starts its suction and compression cycle for subsequent ignition and explosion of the fuel-air mixture, both suction valve 26 and exhaust gas valve 27 will be open for an instant. In this position, the previously performed exhaustion of gases will already have created a turbulent movement on its passage through the turbulence unit. This movement in the exhaust system forms a vacuum in the branch pipe when the exhaust valve closes.
• Fig. 5 is a diagram showing the output in kilowatt as a function of the motor speed, stated in rpm for a four-cylinder petrol engine.
• the unbroken line represents the standard version and the broken line the use of an exhaust system with turbulence unit and by-pass pipe. As shown in the diagram, a power increase in the order of 20 % is obtained with the turbulence unit connected in an ordinary system. Even higher outputs are feasible depending on the technical construction of the engine used.
• This standing wave of exhaust gases with alternating high and low pressure is sinus-shaped.
• the frequency of the wave is dependent on the speed of the motor, higher frequency at higher speed.
• the turbulence unit used for the experiment also used in drawing up the curves shown in Fig. 5, consisted of a steel pipe about 400 mm long, with a diameter of 65 mm and a wall thickness of ca. 4 mm.
• a piece of helically twisted flat steel was fitted centrally with great accuracy in the pipe, leaving a gap of ca. 2 - 3 mm between the inner surface of the pipe and the edges of the flat steel. This created conditions suitable for a laminar gas flow necessary for the function of the whole system.
• the by-pass pipe was provided with a counterweight-loaded flap with a smaller gap-opening in closed position.
• the object of the flap is to decrease the high effect of the turbulence unit at low-load.
• the gap-opening is necessary to provide a sufficient vacuum at low speed.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust Silencers (AREA)

Applications Claiming Priority (1)

Publications (1)

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• 1983
  • 1983-05-27 EP EP83901950A patent/EP0175680A1/de not_active Withdrawn
  • 1983-05-27 WO PCT/SE1983/000214 patent/WO1984004781A1/en not_active Ceased
• 1985
  • 1985-11-25 SE SE8505550A patent/SE450400B/sv not_active IP Right Cessation

Non-Patent Citations (1)

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