Classifications

• • 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
  • F02M35/0201—Housings; Casings; Frame constructions; Lids; Manufacturing or assembling thereof
  • F02M35/021—Arrangements of air flow meters in or on air cleaner housings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
  • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
  • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
  • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
  • G01F15/12—Cleaning arrangements; Filters
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F5/00—Measuring a proportion of the volume flow

Definitions

• the invention relates to a device for determining at least one parameter of a medium flowing in a line with the features of the preamble of independent claim 1.
• DE 101 35 142 A1 discloses a device for determining the mass of a medium flowing in a line, which has a part that can be inserted into the line and in which a measuring channel with a measuring element is arranged.
• Devices of this type are used, for example, as air mass meters in the air intake tract of an internal combustion engine. Splashing water, dust and oil vapor can enter the air intake tract and are transported from the medium to the part of the device inserted into the line. So that these impurities do not enter the measuring channel as far as possible, the known device has an entrance area which opens into an excretion zone, and a measuring channel which branches off from the entrance area so that the media stream entering the entrance area is divided and a partial stream into the Entry of the measuring channel arrives.
• the measuring channel has a curved section behind its inlet, in which the partial flow of the medium that has entered the measuring channel is deflected.
• the disadvantage here is that the flow can detach in the region of the curvature and create zones of low flow velocity or even backflow. In the area with no flow, vortices and an irregularly pulsating flow occur. Since the curved section merges into a further section provided with the measuring element, the separation of the flow in front of the sensor element has an unfavorable effect on the flow conditions on the sensor element, which can result in increased signal noise of the sensor signal. The resulting change in the sensor signal leads to a disadvantageous deviation of the measurement results from the values actually present.
• the device according to the invention for determining at least one parameter of a medium flowing in a line with the characterizing features of claim 1 has the advantage that a separation of the flow in the region of the curved section of the measuring channel is avoided. This is achieved by means protruding into the measuring channel, which, viewed in the direction of the measuring channel flow, are arranged behind the inlet and in front of the measuring element, which guide the flow and counteract separation of the flow of the partial media flow from the channel walls of the measuring channel. The flow can be guided around the curvature without detachment or at least with little detachment, which improves the flow quality at the sensor element and reduces the signal noise.
• the means can advantageously comprise at least one one-part, continuous or an interrupted, two-part partition which extends transversely to the measuring channel flow direction in the measuring channel.
• the at least one partition can be inserted into the measuring channel without major manufacturing outlay.
• the rear side of the partition wall or the partial wall pieces of the partition wall that faces away from the measuring channel flow relative to be arranged to the measuring channel flow direction at an angle which is less than ninety degrees and greater than zero degrees. Due to the inclination of the rear wall, a transverse flow is created over the flow guide surfaces of the partition wall that run parallel to the measurement channel flow, which transports water across the guide surfaces across the measurement channel flow direction to the inner walls of the measurement channel, where the water can collect without reaching the sensor element.
• FIG. 1 shows a cross section through a first exemplary embodiment of the part of the device according to the invention provided with the measuring channel in a position inserted into the line
• FIG. 2 shows an enlarged detail view, which shows a cross section perpendicular to the plane of the drawing in FIG. 1 through the measuring channel in the region the partition for another embodiment of the invention shows.
• the line can be, for example, an intake manifold of an internal combustion engine.
• the medium is, for example, the air flowing in the intake manifold to the internal combustion engine.
• a device 1 for determining a parameter of the medium flowing in the line 3 is arranged on the line 3 such that a part 6 of this device projects into the line 3 and is exposed to the medium flowing there with a predetermined orientation.
• the device 1 for determining at least one parameter of the medium comprises, in addition to the part 6 introduced into the line, a support part (not shown in more detail) with an electrical connection, in which support part e.g. an evaluation electronics is housed.
• the device 1 can be inserted, for example, with the part 6 through an insertion opening 16 of a wall 15 of the line 3, which wall 15 limits a flow cross section of the line 3.
• the evaluation electronics can be arranged inside and / or outside the flow cross section of the line 3.
• a measuring element 9 is used in the device 1 on a measuring element carrier 10, which is electrically connected to the evaluation electronics.
• the volume flow or the mass flow of the flowing medium is determined, for example, as a parameter.
• More Pa- Parameters that can be measured are, for example, pressure, temperature, concentration of a medium component or the flow rate, which can be determined using suitable sensor elements.
• the device 1 has, for example, a longitudinal axis 12 in the axial direction, which for example runs in the direction of installation of the device 1 in the line 3 and which e.g. can also be the central axis.
• the direction of the medium flowing in the longitudinal direction of the line 3, hereinafter referred to as the main flow direction 18, is identified by corresponding arrows 18 in FIG. 1 and runs from right to left there.
• the part 6 has a housing with, for example, a cuboid structure with an end wall 13 facing in the installation position of the main flow direction 18 of the medium and a rear wall 14 facing away from it, a first side wall and a second side wall and a third wall 19, for example, running parallel to the main flow direction
• the part 6 also has a channel structure arranged therein with an input area 27 and a measuring channel 40 branching off from the input area 27.
• the arrangement of the device 1 relative to the line 3 ensures that the medium flowing in the main flow direction 18 hits the part 6 in a predetermined direction and a partial flow of the medium in this direction through an opening 21 on the end face 13 into the input region 27 arrives.
• the opening 21 can, for example, be oriented perpendicular to the main flow direction 18, but a different orientation of the opening 21 to the main flow direction 18 is also conceivable.
• a partial flow of the medium that has entered the input area passes through an inlet 41 into the one provided with the measuring element 9 Measuring channel 40 branching off the entrance area.
• the medium in the entrance area also flows further into an excretion zone located behind the inlet of the measurement channel, which via at least one excretion opening 33 arranged in the first side wall and / or the second side wall and / or the wall 19 with the line 3 is connected.
• the opening 21 on the end face 13 of the part 6 has an upper edge 36 in the axial direction 12 which is closest to the measuring element 9 in the axial direction 12.
• An imaginary upper plane 39 runs through the upper edge 36 and perpendicular to the plane of the drawing in FIG. 1 and parallel to the main flow direction 18.
• the discharge opening 33 is arranged in the axial direction 12 below this upper plane 39.
• the entrance area 27 is provided in the area of the opening 21 with inclined or curved surfaces which are designed in such a way that the medium flowing into the entrance area is deflected away from the upper level 39. Liquid and or solid particles contained in the incoming partial flow of the medium, which are larger and have a higher density than the gaseous flowing medium, move away from the upper plane 39 in the axial direction 12. Since the discharge opening 33 is arranged below the upper level 39, the liquid and solid particles collect in the discharge zone 28 and are sucked into the line 3 by the air flowing past the discharge opening 33.
• a partial flow of the medium passes through the inlet 41 of the measuring channel 40 into a first, curved section 42 of the measuring channel.
• the partial flow of the medium that has entered the measuring channel flows through the measuring channel in the measuring channel flow direction a from the inlet 41 to the outlet 49 of the measuring channel.
• “measurement channel flow direction” in the context of the application is understood to mean the direction of the flow from the inlet to the outlet of the measurement channel and not the speed encapsulate the individual flowing particles.
• the measuring channel flow direction thus runs along the measuring channel and its bends to the outlet.
• the partial flow which has entered the measuring channel 40 through the inlet 41 is deflected in the first, curved section 42 and, at the end of the section 42, reaches a further section 44 which is approximately rectilinear and in which the measuring element 9 is arranged.
• the flow can detach from the inner wall 43 of the measuring channel without countermeasures.
• Fig. 1 the detached flow is shown by the dashed line 60.
• vortices and irregular pulsations occur, which have a disadvantageous effect on the flow in the subsequent further section 44 with the measuring element 9.
• the measurement channel 40 therefore has means 50 which protrude into the measurement channel and guide the flow and counteract detachment of the flow from the inner wall 43 of the measurement channel and, in the best case, completely prevent it.
• the partial flow of the medium then flows into the further section 44 of the measuring channel without detachment.
• the means comprise at least one one-piece, continuous partition 50, which is arranged transversely to the measuring channel flow direction a in the transition region of the curved section 42 into the further section 44.
• the partition 50 is fastened with two end sections facing away from one another, which are not shown in FIG.
• the partition wall has a narrow end face 53 facing the measuring channel flow direction a, a rear side 54 facing away from it and two substantially parallel to the measuring channel flow direction Flow guide surfaces 51 and 52.
• the partition wall can be rounded on the end face 53 and have a guide vane geometry or the guide vane geometry.
• the partition wall 50 can also be formed in two parts and comprise two partial wall sections 50a and 50b, which are fixed with end sections 55a and 55b to mutually opposite inner wall sections 45a, 45b of the measuring channel 40 and protrude towards one another and are preferably spaced apart by a gap 59.
• the end faces 53a and 53b of the partial wall pieces are preferably oriented perpendicular to the measuring channel flow direction a. It is particularly advantageous if the rear sides 54a and 54b of the partial wall pieces 50a, 50b are preferably flat and, seen in the cross section of FIG.
• the partition 50 is made in one piece as in the exemplary embodiment from FIG. 1, the then individual rear wall can be oriented at an angle of less than ninety degrees and greater than zero degrees to the measuring channel flow direction.
• the medium flows into the further section 44 towards the measuring element 9.
• the cross section of the further section 44 tapers in the measuring channel flow direction a, which is due to two mutually facing acceleration ramps is achieved, with the viewer looking vertically at a first ramp in FIG. 1.
• the tapering of the cross section or the acceleration ramps in the form of an all-round or partial narrowing of the side surfaces of the measuring channel 40 the medium is rapidly transported through the measuring channel in the measuring channel flow direction a, and consequently air is sucked out of the input region 27.
• the medium is deflected behind the measuring element 9 into a channel section 47 which extends approximately in the axial direction 12 away from the insertion opening 16. From this channel section, it is deflected into a last channel section 48 which, for example, runs counter to the main flow direction 18, and passes through the outlet 49 of the measurement channel 40, which for example is perpendicular to the main flow direction 18 or at an angle different from zero degrees to the main flow direction 18 is arranged in the line 3 back.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Measuring Volume Flow (AREA)
• Measuring Fluid Pressure (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32240171

Family Applications (1)

Country Status (5)

Families Citing this family (15)

Family Cites Families (8)

• 2002
  • 2002-11-20 DE DE10253970A patent/DE10253970A1/de not_active Withdrawn
• 2003
  • 2003-05-23 JP JP2004552362A patent/JP2006506625A/ja not_active Withdrawn
  • 2003-05-23 EP EP03740022A patent/EP1565707A1/de not_active Withdrawn
  • 2003-05-23 WO PCT/DE2003/001672 patent/WO2004046654A1/de not_active Application Discontinuation
  • 2003-05-23 US US10/534,105 patent/US20060150730A1/en not_active Abandoned

Non-Patent Citations (1)

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