EP1733131A1 - Dispositif et procede destines a reduire la contamination d'un detecteur - Google Patents

Dispositif et procede destines a reduire la contamination d'un detecteur

Info

Publication number
EP1733131A1
EP1733131A1 EP05707904A EP05707904A EP1733131A1 EP 1733131 A1 EP1733131 A1 EP 1733131A1 EP 05707904 A EP05707904 A EP 05707904A EP 05707904 A EP05707904 A EP 05707904A EP 1733131 A1 EP1733131 A1 EP 1733131A1
Authority
EP
European Patent Office
Prior art keywords
sensor
signal
media entry
switch
voltage supply
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.)
Withdrawn
Application number
EP05707904A
Other languages
German (de)
English (en)
Inventor
Joerg Brueckner
Dirk Foerstner
Dirk Stockmann
Joerg Wingbermuehle
Matthias Illian
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1733131A1 publication Critical patent/EP1733131A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
    • 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
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • 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
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • G01F1/6983—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters adapted for burning-off deposits
    • 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
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • F02D2041/283—Interface circuits between sensors and control unit the sensor directly giving at least one digital reading
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to devices and methods for reducing the contamination of a sensor, in particular a hot film air mass meter in a motor vehicle, according to the combination of features of the main claim.
  • the functional and lifespan properties of sensors can be negatively influenced by certain operating conditions and environmental influences.
  • the output signal of a hot-film air mass meter can be falsified briefly or permanently when driving a vehicle in the event of impermissibly high pollution due to the entry of harmful media such as oil, water, particles or salt crystals.
  • harmful media such as oil, water, particles or salt crystals.
  • the deposit of harmful media is even more favored for some sensor types by the operation of the sensors.
  • DE 101 63 751 AI it is proposed to change the output signal of a hot film air mass meter in the event of contamination or to use another signal in order to prevent incorrect measurements.
  • a brief media entry on a sensor during driving operation is recognized, for example using a software function that evaluates certain sensor signals or replacement signals. Such a plausibility check or the substitution of the air mass sensor signal in the event of a signal fault ensures that the internal combustion engine can continue to be operated reliably even when the sensor is dirty.
  • the software function with the aid of which the media entry is recognized comprises, for example, forming a difference between two signal gradients. In DE 101 63 751 AI is thus recognized
  • the device according to the invention with the features of the main claim and the associated method according to the invention have the advantage that a protective function is obtained for a sensor, which reliably ensures that the sensor is not contaminated or destroyed if the conditions are unfavorable for it. This advantage is achieved by switching off the sensor when unfavorable operating conditions are detected.
  • a sensor in particular a hot-film air mass meter
  • the detection of a short-term media entry on the sensor while driving can be partially done using a software function that evaluates certain sensor signals or replacement signals.
  • a software function that evaluates certain sensor signals or replacement signals.
  • To detect a short-term media entry for example, the formation of a difference between two signal gradients is evaluated and, in the case of certain predefinable deviations, a possible media entry is recognized and the sensor is switched off, this switch-off advantageously taking place only for a certain time and in particular after a phase with a risk of media entry being recognized again is ended, i.e. the sensor is switched on again.
  • a protective function can be represented with the solution according to the invention, which is able to switch off a sensor in a targeted manner and for an optimal period of time after detection of media entry by means of software and / or hardware, in particular in order to increase the service life of the sensor and To prevent incorrect measurements.
  • the use of an additional high-side or low-side switch provides an advantageous hardware function which, when using a suitable software function, enables the sensor to be switched off in a targeted and time-limited manner.
  • the advantageous shutdown in the event of contamination results in a measurable improvement in the service life and functionality, since the hot film air mass meter absorbs less deposits when switched off than in operation.
  • the hardware shutdown function can be implemented very inexpensively, in particular by using a low-side switch. Since a modern engine control unit often already has a large number of integrated low-side switches, which can be located within a module, those that are available for reserve purposes can be activated and are therefore available free of charge. Alternatively, the use of an additional high-side switch is also possible.
  • a suitable software function controls the switch provided for switching off the sensor in such a way that it is only switched off actively if harmful media entry is detected during operation by the sensor itself or other auxiliary variables and, if necessary, also in the wake of the control unit.
  • a further advantageous embodiment of the invention which enables the sensor element to be switched off particularly quickly, is achieved by implementing the switch-off function in the sensor itself.
  • the switch-off control system lies in the sensor, which means that the control unit and its software influence switch-off. can be closed.
  • a switching element is advantageously integrated in the sensor or in the sensor element, via which the sensor can be switched off.
  • This embodiment of the invention has the further advantage that rapid, pulsed multiple shutdown is possible in order to determine the optimal shutdown period and to provide the control device with a valid measured value again immediately after the media entry has ended.
  • the use of internal sensor signals enables more precise detection of media entry than the sole evaluation of the sensor output signal. This is because a larger number of signals or features are available internally in the sensor, but not all of them are transmitted from sensor to control unit due to the cost-optimized signal transmission range.
  • the hardware shutdown function can be implemented very inexpensively, in particular by using sensor-internal hardware and software and evaluating sensor-internal control signals, for example voltages or currents from control loops that are only available internally by the sensor.
  • Subfunction 1 is able to recognize a media entry, for example by forming the difference between two signal gradients and using additional sensor-internal signals, and then to switch off the sensor element contained in a sensor.
  • the subfunction 2 provides a substitute signal or a substitute value, which can be output by the sensor instead of the invalid measured value when a media entry is detected, and subfunction 3 extends the sensor output signal by the additional information that a media entry is recognized, this media entry information being more advantageous Way for the duration of the media entry remains.
  • the media entry information can be obtained by modulating or setting a defined pulse width ratio, so that the measured value or a substitute value can be output and transmitted together with the media entry information.
  • a value outside of the substitute value can be used of the useful signal area are transmitted and the control device is given an indication that there is a media entry.
  • the above-mentioned advantageous embodiment of the invention ensures that sensor elements can be switched off in a targeted manner when media entry occurs and is limited in time. It is further ensured that sensors can pass this information on to the recipient when a media entry is detected, and it is ensured that a sensor does not record and transmit a measured value when the media entry differs very much from the real value.
  • the fault tolerance in this case can be reduced by providing a replacement value for the measurement signal.
  • FIG. 1 shows an embodiment according to the prior art.
  • FIG. 2 and FIG. 3 show two alternative solutions according to the invention for exemplary embodiments for switching off a sensor while driving, the switch-off means being installed in a control unit.
  • FIG. 4 shows A further exemplary embodiment of the invention is shown in FIG. 4, in which sensor-internal switching off of the sensor element is possible via a sensor-internal switching means.
  • FIGS. 5 and 6 show signal curves for normal operation and operation with media entry, FIG. 5 applying to the exemplary embodiments according to FIG. 2 or 3 and FIG. 6 to the exemplary embodiment according to FIG.
  • the exemplary embodiments shown in the drawing are explained in more detail in the following description.
  • Figure 1 shows an example of the connection between a sensor 10 and an engine control unit 11 according to the current state of the art.
  • the sensor 10 is, for example, a hot-film air mass meter, which emits a measurement signal M1 to the engine control unit 11 via a line L1. Depending on the design of the sensor 10, this measurement
  • FIG. 2 shows a first exemplary embodiment of the invention for a sensor 12, for example a hot-film air mass meter, the output signal of which is evaluated by an engine control unit 13, in which an additional switch HS 1 is present compared to the arrangement according to FIG.
  • This switch HS 1 is a so-called high-side switch that engages the live line L2 and interrupts it if necessary.
  • the switch HSl is part of the engine control unit 13. In the embodiment variant according to FIG.
  • the high-side switch HSl is used to switch off the sensor 12 while driving, the supply voltage UI (12 volts or 5 volts) of the sensor 12 being switched off.
  • a software function 14 contained in the engine control unit 13 recognizes the media entry through an intelligent evaluation of the detected sensor measurement signal Ml and switches the sensor 12 off for a defined time via the control signal S1 for the high-side switch HSl. This time can either be a selected, predefinable time period, but it is also possible to keep the sensor switched off until the software function in the engine control unit detects that there is no longer any fear of media entry.
  • the sensor 12 can comprise, for example, the components sensor element 15 shown in FIG. 2 and a signal evaluation circuit 16 with sensor-internal hardware and software functions.
  • the sensor element 15 supplies the measurement signal M2 to the sensor evaluation circuit 16.
  • the voltage supply is labeled U2, the ground connection is labeled GND2.
  • this configuration of the sensor is only an example and is not absolutely necessary.
  • the software function runs in a processor of the control device 13, enables the media entry to be recognized and generates control signals for actuating the switch, these control signals each opening or closing the switch HS1 at a time determined by means of the software function - effect.
  • FIG. 3 shows a further embodiment variant for switching off the sensor while driving via an inexpensive low-side switch LSI, which is part of the engine control unit 13 and switches off the ground or ground GND connection of the sensor 12.
  • LSI low-side switch
  • the hardware shutdown function can be implemented very inexpensively, since it does not have an additional one in many control units
  • Such a shutdown can be, for example, a shutdown in the control unit run-on, the switch being arranged at a suitable point in the control unit or outside.
  • a switch is used which is used to short-circuit the voltage supply UI to ground GND and previously implements the switching function mentioned above. This short-circuits the sensor supply on the sensor side and, if necessary, improves the electromagnetic compatibility EMC.
  • a device for reducing the contamination of a sensor is also included, in which the sensor has a control device, for example a
  • Control unit is connected, this connection comprising a voltage supply, its ground connection and a signal connection.
  • a sensor element, a sensor evaluation circuit and switching means which interrupt the voltage supply are present in the sensor, the sensor evaluation circuit supplying the control signal for the switching means for interrupting the voltage supply. This enables the sensor element to be switched off internally in the event of contamination.
  • FIG. 4 Such an exemplary embodiment according to the invention is shown in FIG. 4, which enables sensor-internal switching off of sensor 12 or sensor element 15 via a high-side switch HS2.
  • a low-side switch could be used, which can interrupt the GND2 ground connection.
  • other switches can also be used, which are each installed in the sensor 12, in the sensor evaluation circuit 17 or in the sensor element 15 itself and the sensor or the sensor element if required, for example by adding a
  • the switch can be designed in different embodiments.
  • connection L3 carrying the voltage U2 between the sensor element 15 and the sensor evaluation circuit 17 can be interrupted by means of the high-side switch HS2.
  • the control unit 13 may only need a simplified software function 14a.
  • an intelligent sensor-internal protective function which can consist of a suitable hardware and / or software function, can be divided into individual sub-functions, three sub-functions being expedient, for example.
  • Sub-function 1 is able to switch off the sensor element 15 contained in a sensor 12, which detects the measurement signal] and comes into direct contact with the medium, after detection of a media entry and for an optimal period of time.
  • the measurement signal and further sensor-internal signals are integrated within the sensor, for example in a sensor evaluation circuit 17 by means of filter functions and plausibility checks
  • a switch-off signal S3 is generated, which switches the sensor element 15 off by actuating a switch, for example the high-side switch HS2, or interrupts the voltage supply for the sensor element.
  • a switch for example the high-side switch HS2
  • the subfunction 2 provides a substitute value, which is output by the sensor 12 when the media entry is recognized instead of the then invalid measured value. With media entry, the measured value can be falsified by the media entry and thus lead to incorrect measurements. By providing a replacement value, the measurement error of the
  • the substitute value can, for example, be the last valid value without media entry.
  • the subfunction 3 extends the sensor output signal in such a way that, in addition to the measurement signal detected by the sensor element, it contains the additional information “media entry knows ".
  • This information also referred to as” media entry information ", is output for the duration of the media entry.
  • a frequency signal that is to say a signal in which the measured variable is output as the frequency of a square-wave signal, as is customary in hot-film air mass meters, for example by modulating or setting a defined pulse width ratio of the square-wave signal, so that the measured value or substitute value are combined can be issued and transmitted with the media entry information.
  • FIG. 6 shows the signal profiles of UI, Ml and U2 in normal operation and during media entry when using the sensor-internal subfunctions according to FIG. 4, that is, with the possibility of switching the sensor 12 off via a sensor-internal switch.
  • the media entry should start again at time T0 and end at time T3.
  • the sensor 12 remains switched on when the media is input via the voltage UI, but is deactivated internally via the high-side switch HS2, the sensor element 15, since the supply of the supply voltage U2 to the sensor element 15 is interrupted.
  • the high-side switch HS2 is controlled with the aid of a control signal S3 that is generated in the sensor evaluation circuit 17.
  • the reaction time T2 until the media entry is recognized is significantly shorter than the reaction time T1 according to FIG. 5, which is obtained with the solutions according to FIGS. 2 or 3. Since the sensor evaluation circuit 17 remains switched on and remains supplied with the voltage UI, the sensor evaluation circuit can provide a substitute value for the detected media entry and switch-off of the sensor element 15
  • the substitute value then has, for example, the frequency F2, which deviates slightly from the frequency FI (without media entry) and can be evaluated by the engine control unit.
  • the fault tolerance will be less than the transfer of the value falsified by the media entry.
  • the media entry information is transmitted due to the change in the pulse width ratio of M1 compared to the frequency FI.
  • frequency generally stands for duty cycle or pulse width ratio, so that FI corresponds to a first duty cycle TV1 or a first pulse width ratio and F2 corresponds to a second duty cycle TV2 or a second pulse width ratio and it is essential that FI and F2 differ from one another in a predefinable manner.
  • the sensor element 15 can be switched on and off several times. This enables the sensor 12 to periodically record the media entry until the media entry is no longer present. The sensor element is therefore only switched off for the actual duration of the media entry.
  • a possible alternative to the engine control unit is, for example, the use of any communication partner for the sensor or for the evaluation of the signals supplied by the sensor.
  • the invention is not limited to the combination of sensor, engine control unit, motor vehicle, but is arbitrary for sensors with an associated control device or an assigned processor with software function for detecting a dropping media entry and controllable switches can be used.
  • the invention can be provided for all areas of use as an alternative to use in the automotive sector, in which electronic, electrically operated biochemical, biotechnological or other sensors or sensor elements are used and communicate in some form with a communication partner and also communicate media entry, the sensors or sensor elements are actively protected against contamination by deliberately deactivating sensor elements or parts thereof.

Landscapes

  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Measuring Volume Flow (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne des dispositifs et des procédés destinés à réduire la contamination d'un détecteur, procédés selon lesquels le détecteur, ou un élément détecteur, de préférence, un débitmètre massique d'air à film chaud, est mis hors circuit lorsqu'une fonction logicielle intégrée à une unité de commande détecte une contamination ou un entraînement d'impuretés possible. La mise hors-circuit s'effectue au moyen d'un commutateur haute tension, dans l'alimentation en tension, ou d'un commutateur basse tension dans la connexion de mise à la masse, la détection de l'entraînement d'impuretés et la commande du commutateur s'effectuant à partir de l'unité de commande ou d'un dispositif d'évaluation interne du détecteur. Après mise hors circuit du détecteur, un signal de substitution est généré, ce signal remplaçant le signal de sortie manquant du détecteur.
EP05707904A 2004-03-27 2005-02-01 Dispositif et procede destines a reduire la contamination d'un detecteur Withdrawn EP1733131A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004015124 2004-03-27
DE102004033954A DE102004033954A1 (de) 2004-03-27 2004-07-14 Vorrichtung und Verfahren zur Verringerung der Verschmutzung eines Sensors
PCT/EP2005/050416 WO2005093240A1 (fr) 2004-03-27 2005-02-01 Dispositif et procede destines a reduire la contamination d'un detecteur

Publications (1)

Publication Number Publication Date
EP1733131A1 true EP1733131A1 (fr) 2006-12-20

Family

ID=34960302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707904A Withdrawn EP1733131A1 (fr) 2004-03-27 2005-02-01 Dispositif et procede destines a reduire la contamination d'un detecteur

Country Status (5)

Country Link
US (1) US7487034B2 (fr)
EP (1) EP1733131A1 (fr)
JP (1) JP4542133B2 (fr)
DE (1) DE102004033954A1 (fr)
WO (1) WO2005093240A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102007049712A1 (de) * 2007-10-17 2009-04-23 Robert Bosch Gmbh Einspritz-System und Verfahren zum Betreiben eines Einspritz-Systems
US11085803B2 (en) * 2015-09-24 2021-08-10 Micro Motion, Inc. Entrained fluid detection diagnostic
DE102017211737B4 (de) * 2017-07-10 2019-03-28 Siemens Aktiengesellschaft Überwachungsvorrichtung und Verfahren zur Überwachung eines Systems
DE102018204615A1 (de) * 2018-03-27 2019-10-02 Robert Bosch Gmbh Sensoranordnung für ein Fahrzeug
US11118952B2 (en) 2019-07-23 2021-09-14 Hitachi Astemo Americas, Inc. Reducing mass airflow sensor contamination

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DE3231142A1 (de) 1982-05-26 1983-12-01 Robert Bosch Gmbh, 7000 Stuttgart Wasseranzeigevorrichtung fuer kraftstoff-wasserabscheider
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JPH0672866B2 (ja) * 1986-03-19 1994-09-14 本田技研工業株式会社 酸素濃度検出装置
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JP3502353B2 (ja) 2001-02-13 2004-03-02 中野 昭浩 グリーストラップ清掃装置
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Also Published As

Publication number Publication date
JP2007530863A (ja) 2007-11-01
DE102004033954A1 (de) 2005-10-13
WO2005093240A1 (fr) 2005-10-06
US7487034B2 (en) 2009-02-03
JP4542133B2 (ja) 2010-09-08
US20080133118A1 (en) 2008-06-05

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