EP1934452A1 - Device for pressure-based load detection - Google Patents
Device for pressure-based load detectionInfo
- Publication number
- EP1934452A1 EP1934452A1 EP06792231A EP06792231A EP1934452A1 EP 1934452 A1 EP1934452 A1 EP 1934452A1 EP 06792231 A EP06792231 A EP 06792231A EP 06792231 A EP06792231 A EP 06792231A EP 1934452 A1 EP1934452 A1 EP 1934452A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intake manifold
- manifold pressure
- pressure
- determined
- air mass
- 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.)
- Granted
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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2474—Characteristics of sensors
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0402—Engine intake system parameters the parameter being determined by using a model of the engine intake or its components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
- F02D2200/0408—Estimation of intake manifold pressure
Definitions
- the invention relates to a device for pressure-based load detection according to the preamble of claim 1.
- In the load detection is the determination of the air mass, which is sucked for the purpose of combustion in the combustion chamber of a cylinder of an internal combustion engine.
- two methods are to be distinguished here - those based on an immediate measurement of the air mass by means of sensors (eg hot-film air mass sensor, hot-wire air mass sensor or the like), and those which operate without a direct air mass measurement.
- sensors eg hot-film air mass sensor, hot-wire air mass sensor or the like
- direct air mass measurement the air mass flowing into the intake manifold is measured and the air mass flowing into the cylinder from the intake manifold is calculated by means of a calculation model which describes the intake manifold dynamics.
- the measured intake manifold pressure is usually used, from which an air mass model is used to deduce the incoming air mass.
- These methods are also referred to as pressure-based or suction tube pressure-based methods for load detection.
- the air mass is determined as a function of the intake manifold pressure and the temperature of the air in the intake manifold.
- complex calculation models are required, which describe the fresh air mass flow from the collector in the intake to the combustion chamber of the cylinder.
- Parameters to be taken into account here are, in particular, the engine speed, the camshaft position and / or the lift positions and / or lift positions of exhaust and intake valves, the engine temperature and, with supercharged engines: the position of the bypass (Wastegate).
- the fresh air mass remaining in the cylinders steadily increases with the intake manifold pressure with otherwise identical input parameters (parameters) (FIG. 2).
- Known devices for the pressure-based determination of the air mass (load) therefore include suction tube pressure sensors, which can cover or measure the entire intake manifold pressure range.
- the invention has for its object to provide a device that ensures improved accuracy of the load detection, especially in low load ranges.
- the invention is based on the finding that measurement errors occur due to the tolerance of the sensors, which have different effects in the different load ranges.
- a distinction between an absolute measurement error, the proportion (amount) over the entire measuring range is always the same and which corresponds to a percentage of the final value, and a relative measurement error, the proportion of which changes depending on the height of the measured value .
- the relative measurement error increases disproportionately at small intake pipe pressures (loads) and thus has a particularly disadvantageous effect on the accuracy of the load signal.
- high accuracy of the load signal is extremely important for drivability of a motor vehicle (e.g., in the transition from high loads to idle).
- load calculation models of direct-injection supercharged engines are sensitive to existing pressure sensor tolerances.
- the gradient is twice that of non-supercharged engines due to high valve overlaps (i.e., phases in which both intake and exhaust valves are open) and the intake manifold pressure range to be sensed.
- the device according to the invention is therefore particularly suitable for directly supercharged supercharged internal combustion engines.
- a device comprises a Sensor device (intake manifold pressure sensor) whose measuring range covers only the lower part of the physical intake manifold pressure range of the internal combustion engine. Due to the smaller measuring range, the absolute measuring error is smaller than with a measuring device that covers the entire physical measuring range (total physical intake manifold pressure range). Further, due to the smaller relative measurement error, the error in determining the load as a function of the measured intake manifold pressure is considerably smaller for smaller loads. Outside the pressure range of the pressure sensor used, the intake manifold pressure is determined by means of a calculation model and the required load is calculated on the basis of the calculated intake manifold pressure. The present error due to the calculation model for calculating the intake manifold pressure in the upper intake manifold pressure range is considerably less noticeable, so that clearly outweigh the benefits of increased accuracy in the lower intake manifold pressure range.
- the intake manifold pressure (value) measured in the lower part of the intake manifold pressure range is used directly as an input to a load sensing model to determine the load.
- the intake manifold pressure can be simulated over the entire intake manifold pressure range via a calculation model, wherein the measured intake manifold pressure is supplied to a regulator device in the lower Saugrohrbuchteil Colour (in which the intake manifold pressure is detected by a sensor device) is adjusted over the modeled intake manifold pressure to the measured intake manifold pressure.
- the sensor device is preferably designed such that it covers the entire Saugrohrbuch Kunststoff #2 without active charger (in this lower pressure range of the intake manifold is determined directly via a measurement), while in the pressure range above the intake manifold maximum pressure without active Charger device to intake manifold maximum pressure with active charger device, the intake manifold pressure is determined model-based.
- An embodiment of the invention is illustrated in the drawing and will be described in more detail below. Show it:
- FIG. 1 shows a cylinder of an internal combustion engine with associated intake and exhaust tract in a schematic representation
- Figure 2 the schematically illustrated course of the combustion chamber of a
- Figure 3 the device according to the invention in a first possible
- Figure 4 the device according to the invention in a further possible
- FIG. 1 schematically shows a cylinder 2 of an internal combustion engine of a motor vehicle together with its associated intake tract and its associated exhaust tract.
- a piston 4 driven by a crankshaft not shown, moves up and down.
- the valve drive represented in simplified form by an inlet valve EV and an outlet valve AV together with the associated valve control, which is preferably designed as a valve control variable with respect to the valve timing and / or the valve strokes, the various cycles of a combustion process are realized.
- the intake system comprises a suction pipe 6 with a collector 6a, wherein in the collector 6a for measuring the intake manifold pressure P SD designed as a Saugrohrdrucksensor sensor device S SD is arranged and a controllable throttle 8.
- P SD intake manifold pressure
- S SD Saugrohrdrucksensor sensor device
- a controllable throttle 8 In the illustrated embodiment with supercharger is seen in the intake further a in the air flow direction
- boost pressure sensor S LD In front of the throttle valve 8 arranged boost pressure sensor S LD , a charge air cooler 10 and a compressor unit 12 of a charger provided.
- an exhaust manifold 14 with an integrated turbine unit 16 of the charger and associated controllable bypass 18 (wastegate) is shown.
- the air mass flowing into the combustion chamber is not equal to the air mass remaining in the combustion chamber at some operating points, since a so-called over-flushing can occur, especially in supercharger operation due to valve overlaps, in which portions of the air mass supplied to the combustion chamber are still in the intake stroke in the exhaust tract be forwarded and thus not available in the combustion process.
- FIG. 3 illustrates a first preferred embodiment of the device according to the invention.
- the device according to the invention is designed such that via the intake manifold pressure P SD , P SD 'the incoming air mass LM can be determined by means of a calculation model M LE for load detection. Furthermore, there is a sensor device S SD for direct detection of the intake manifold pressure P SD , which is designed (designed) with respect to its measuring range such that the intake manifold pressure P SD can only be measured in a lower intake manifold pressure portion of the internal combustion engine.
- a calculation model M SD for indirect detection of the intake manifold pressure P SD ' is present, which is designed such that hereby the intake manifold pressure P SD ' can be determined by calculation in an upper intake manifold pressure portion of the internal combustion engine.
- the device is designed such that within the lower Saurohrbuchteilrios the incoming air mass LM is determined as a function of the measured by the sensor device S SD intake manifold pressure P SD , and that within the upper Saugrohrteilteil Schemes the incoming air mass LM via the determined by means of calculation model M SD intake manifold pressure P SD 'is determined.
- a monitoring device ÜE is provided, by means of which it is monitored whether the actual intake manifold pressure is within the measuring range of the sensor device S SD or not.
- the sensor means S SD is in the measuring range (n Psensor_m l ⁇ x ⁇ Psensor_max), the measured intake manifold P SD is forwarded for further processing directly to the calculation model M LE for load detection. If there is an intake manifold pressure that is outside the measuring range (Sensor_max S ) of the sensor device S SD , an intake manifold pressure P S D 'is calculated and this forwarded instead of the measured intake manifold pressure P SD for further processing to the calculation model M LE for load detection (or for determining the air mass LM).
- the selection of which suction pipe pressure (measured intake manifold pressure P S o or model-based calculated intake manifold pressure P SD ') is relevant and is forwarded is realized by means of a control unit L) E controlled diverter member W.
- the device according to the invention for determining the load can be designed such that it always works with a model-based intake manifold pressure P SD 'as an input signal for the calculation model M LE for load detection.
- a device according to FIG. 4 is used for this purpose.
- the intake manifold pressure P SD ' is always determined based on the model, whereby the calculated intake manifold pressure P SD ' is adjusted to the measured intake manifold pressure P SD via a correction value K, depending on whether the intake manifold pressure is within the measuring range of the sensor device S SD or the calculated intake manifold pressure P SD 'remains unchanged.
- a correction value K for calculating the intake manifold pressure P S o ' is determined via a balancing regulator R.
- the correction quantity K is determined by means of a difference between measured intake manifold pressure P SD and calculated intake manifold pressure P SD 'fed to balancing regulator R, and the calculated intake manifold pressure P SD ' is compared to the measured intake manifold pressure P SD . If the intake manifold pressure value is outside the sensor measurement range, the calculation model M SD for calculating the intake manifold pressure P SD 'can not be adjusted to the measured intake manifold pressure P SD .
- the unbalanced calculated intake manifold pressure value P SD ' is then used directly as input to the post-order calculation model M LE for load detection.
- the calculation model for load detection instead of the correction value K, a neutral value N is fed to the calculation of the intake manifold pressure is not affected.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005046504A DE102005046504A1 (en) | 2005-09-29 | 2005-09-29 | Device for determining the air mass flowing in the cylinder combustion chamber of an engine cylinder of a vehicle comprises a sensor arrangement for directly measuring the suction tube pressure and a calculating module |
PCT/EP2006/009229 WO2007036330A1 (en) | 2005-09-29 | 2006-09-22 | Device for pressure-based load detection |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1934452A1 true EP1934452A1 (en) | 2008-06-25 |
EP1934452B1 EP1934452B1 (en) | 2009-03-11 |
Family
ID=37433726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06792231A Expired - Fee Related EP1934452B1 (en) | 2005-09-29 | 2006-09-22 | Device for pressure-based load detection |
Country Status (4)
Country | Link |
---|---|
US (1) | US7546760B2 (en) |
EP (1) | EP1934452B1 (en) |
DE (2) | DE102005046504A1 (en) |
WO (1) | WO2007036330A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009003285B4 (en) * | 2009-05-20 | 2021-01-07 | Robert Bosch Gmbh | Method for diagnosing pressure sensors of an air supply to an internal combustion engine |
JP5204162B2 (en) * | 2009-08-05 | 2013-06-05 | 本田技研工業株式会社 | Vehicle speed change control device |
DE102014003276A1 (en) * | 2014-03-12 | 2015-09-17 | Man Truck & Bus Ag | Internal combustion engine, in particular gas engine, for a motor vehicle |
CN110907165B (en) * | 2019-12-26 | 2024-06-14 | 重庆科杰实业有限责任公司 | Three comprehensive detection frock of air intake manifold |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5003950A (en) * | 1988-06-15 | 1991-04-02 | Toyota Jidosha Kabushiki Kaisha | Apparatus for control and intake air amount prediction in an internal combustion engine |
CA2217824C (en) | 1995-04-10 | 2006-01-24 | Siemens Aktiengesellschaft | Method for determining the air mass flow into the cylinders of an internal combustion engine with the aid of a model |
EP0886725B1 (en) | 1996-03-15 | 1999-08-25 | Siemens Aktiengesellschaft | Process for model-assisted determination of fresh air mass flowing into the cylinder of an internal combustion engine with external exhaust-gas recycling |
US6078907A (en) * | 1998-02-18 | 2000-06-20 | Lamm; David | Method and system for electronically presenting and paying bills |
DE10049907B4 (en) * | 2000-10-10 | 2014-09-11 | Robert Bosch Gmbh | Method, computer program and control and / or regulating device for operating an internal combustion engine |
DE10102914C1 (en) | 2001-01-23 | 2002-08-08 | Siemens Ag | Method for determining an estimated value of a mass flow in the intake tract of an internal combustion engine |
EP1715163A1 (en) | 2001-11-28 | 2006-10-25 | Volkswagen Aktiengesellschaft | Method for determining the composition of a gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation |
US6804601B2 (en) * | 2002-03-19 | 2004-10-12 | Cummins, Inc. | Sensor failure accommodation system |
DE10227466B4 (en) * | 2002-06-20 | 2004-06-09 | Bayerische Motoren Werke Ag | Method for determining cylinder loading in an internal combustion engine |
JP4029739B2 (en) * | 2003-02-05 | 2008-01-09 | トヨタ自動車株式会社 | Calculation of charge air quantity in internal combustion engine |
CN100532809C (en) * | 2003-07-10 | 2009-08-26 | 丰田自动车株式会社 | Air inflow predicting device of internal combustion engine |
DE102004041708B4 (en) * | 2004-08-28 | 2006-07-20 | Bayerische Motoren Werke Ag | Method for the model-based determination of fresh air mass flowing into the cylinder combustion chamber of an internal combustion engine during an intake phase |
JP4143862B2 (en) * | 2004-11-29 | 2008-09-03 | トヨタ自動車株式会社 | Air quantity estimation device for internal combustion engine |
-
2005
- 2005-09-29 DE DE102005046504A patent/DE102005046504A1/en not_active Withdrawn
-
2006
- 2006-09-22 EP EP06792231A patent/EP1934452B1/en not_active Expired - Fee Related
- 2006-09-22 WO PCT/EP2006/009229 patent/WO2007036330A1/en active Application Filing
- 2006-09-22 DE DE502006003125T patent/DE502006003125D1/en active Active
-
2008
- 2008-03-27 US US12/056,739 patent/US7546760B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007036330A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7546760B2 (en) | 2009-06-16 |
US20080229816A1 (en) | 2008-09-25 |
DE502006003125D1 (en) | 2009-04-23 |
WO2007036330A1 (en) | 2007-04-05 |
EP1934452B1 (en) | 2009-03-11 |
DE102005046504A1 (en) | 2007-04-05 |
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