Classifications

• • 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
  • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
  • F02B29/04—Cooling of air intake supply
  • F02B29/0406—Layout of the intake air cooling or coolant circuit
  • F02B29/0425—Air cooled heat exchangers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/02—Air cleaners
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/02—Air cleaners
  • F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
  • F02M35/09—Clogging indicators ; Diagnosis or testing of air cleaners
• • 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 present invention relates to a method for filtering intake air for an internal combustion engine in which the intake air is first made to pass through a first filter for filtering of the intake air. whereafter the intake air is compressed and then cooled in order to be subsequently introduced into the internal combustion engine.
• the invention also relates to an intake system for performing the method, and the use of an intake system in an internal combustion engine.
• FR-A 2 401 324 which relates to an air filter arrangement for an internal com ⁇ bustion engine is part of the state of the art.
• the problem which is the basis for this known air filter arrangement is that the filter, which previously was situated downstream and after the airbo unit, is subjected to high temperatures.
• expensive filter materials were required which, however, did not exhibit sufficient stability and strength.
• the filter was provided inter alia with a support device which led to increased size of the niter arrangement.
• the filter is placed after an intercooler so that the filter is not subjected to high temperatures.
• the problem which is the basis for the present invention is, however, of a completely different type.
• a negative pressure may occur in the intake system downstream of the turbo unit during certain operating conditions.
• Such operating conditions can for example be idling and engine braking. If air leaks into the intake system downstream of the first filter then contaminations, such as abrasively acting particles, can reach the intake manifold of the internal combustion engine and pass into the cylinders of the internal combustion engine which increases the wear on the internal combustion ensine.
• the intake air is made to pass a safety filter after having been cooled and before it is introduced into the internal combustion engine, which safety filter is intended to collect particles in the intake air in the event that the first filter fails or if air leaks into the intake system downstream of the first filter.
• a safety filter of this type is placed downstream of the intercooler.
• Figure 1 illustrates an intake system according to a first embodiment
• Figure 2 discloses an intake system according to a second embodiment.
• FIG. 1 and 2 is shown an intake system 1 for the intake air for an internal combustion engine 2.
• the intake air flows into the intake system 1 through an opening 3 in the direction of the arrow 4.
• the intake air passes thereafter through a first filter 5 by means of which particles of a predetermined size which are present in the intake air are filtered out.
• the predetermined particle size to be filtered out depends amongst others on me type of filter material being used.
• the first filter 5 can for example comprise a dry filter with a filter density which filters out panicles which are larger than a predetermined particle size. It is also conceivable that the first filter 5 can comprise a conventional filter unit which includes a cyclone cleaner, a main filter and a secondary filter which are contained in one and the same filter housing.
• the turbo umt 6 can comprise an exhaust turbo in which the exhaust gases of the internal combustion engine 2 d ⁇ ve a turbine which m turn drives a compressor. It is. however, conceivable that a mechamcally or electrically driven compressor can be used in order to compress the intake air.
• the coefficient of fullness is defined as the relationship between me air mass existing in the cylinder at the beginning of the compression and the theoretically possible air mass depending on the piston displacement. As the mass of air is dependent on the air's temperature and pressure, then the coefficient of fullness increases if the pressure of the intake air increases and the temperature decreases.
• the temperamre of the intake air climbs.
• the intake air is cooled by means of an mtercooler 7 which can be comprised of a conventional heat exchanger.
• the intercooier 7 can have a throughflow of atmospheric air, that is to say ambient air.
• a safety filter 8 is arranged downstream of the mtercooler 7 and upstream of an intake mamfold 9 of the internal combustion en ⁇ me 2.
• the saferv filter 8 is consequentiy intended to collect particles in the intake air if air leaks into the intake system 1 downstream of the first filter 5.
• the safety filter 8 is also intended to collect panicles in the intake air in the event that the first filter 5 fails, e.g. due to collapse of the filter material creating a hole therein.
• the safety filter 8 comprises a filter material which preferably is designed with the same filter density as that of the first filter 5, whereby the first filter 5 and the safety filter 8 are arranged to filter panicles of the same order of size. Therefore, the first filter 5 alone is intended to filter the whole of the air volume which forms the intake air of the internal combustion engine 2 during normal operation of me intake system 1.
• a first and a second pressure sensor 10, 11 are arranged upstream and downstream of the safety filter 8.
• the pressure sensors 10, 11 are connected to a differential pressure gauge 12 which gives an electronic alarm signal, for example to a control lamp (not shown), when the difference between me pressure upstream and downstream of the safety filter 8 exceeds a prede ⁇ termined value.
• the safety filter 8 is consequently panially or completely blocked with panicles, which requires cleaning or replacement thereof, and any leakage in die inlet system 1 must be repaired at the same time. Also, the first filter 5 must be exchanged or repaired if it has failed.
• Figure 1 which shows a first preferred embodiment of an intake system 1
• the safety filter 8 is arranged adjacent to the intake manifold 9 of the internal combustion engine 2.
• the first pressure sensor 10 which is arranged upstream of the safety filter 8. is placed according to this embodiment suitably in a pipe or a hose 13 which leads the intake air from the intercooier 7 to the safety filter 8.
• the second pressure sensor 11 is suitably placed in the intake manifold 9.
• FIG. 2 which shows a second embodiment of an intake system 1 , the safety filter 8 is arranged adjacent to die intercooier 7.
• the first pressure sensor 10, which is arranged upstream of the safety filter 8, is placed according to this embodiment suitably in the border region between the intercooier 7 and the safety filter 8.
• the second pressure sensor 11 is suitably placed in the pipe or the hose 13 which leads the intake air from the safety filter 8 to the intake manifold 9.
• the intercooier 7 is aircooled.
• the cooling channels of the intercooier 7 become greatly contaminated on the outside, men the intake air will not be cooled.
• the intake air which flows through the safety filter 8 will consequently then have a relatively high temperamre so that the safety filter 8 must be dimensioned to resist this increased temperamre.
• the advantage of the present invention is that the life of die internal combustion engine increases, because abrasively acting panicles which can leak into the intake system are prevented, by means of the safety filter 8, from reaching the internal combustion engine 2.
• a further advantage is that a possible leakage in the intake system 1, or a failed first filter 5. can be detected by means of the pressure sensors 10, 11.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20401990

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (4)

• 1996
  • 1996-03-28 SE SE9601196A patent/SE9601196L/sv not_active Application Discontinuation
• 1997
  • 1997-03-26 AU AU23152/97A patent/AU2315297A/en not_active Abandoned
  • 1997-03-26 WO PCT/SE1997/000538 patent/WO1997036102A1/en active Application Filing

Patent Citations (4)

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