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WO2002016745A2 - Procede de detection de cliquetis pour un moteur a combustion interne et dispositif correspondant - Google Patents

Procede de detection de cliquetis pour un moteur a combustion interne et dispositif correspondant Download PDF

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Publication number
WO2002016745A2
WO2002016745A2 PCT/DE2001/002310 DE0102310W WO0216745A2 WO 2002016745 A2 WO2002016745 A2 WO 2002016745A2 DE 0102310 W DE0102310 W DE 0102310W WO 0216745 A2 WO0216745 A2 WO 0216745A2
Authority
WO
WIPO (PCT)
Prior art keywords
time window
signals
cylinder
air ratio
size
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.)
Ceased
Application number
PCT/DE2001/002310
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German (de)
English (en)
Other versions
WO2002016745A3 (fr
Inventor
Juergen Sauler
Axel Heinstein
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 WO2002016745A2 publication Critical patent/WO2002016745A2/fr
Publication of WO2002016745A3 publication Critical patent/WO2002016745A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor

Definitions

  • the invention relates to a method for knock detection for an internal combustion engine and a corresponding device.
  • a method and a corresponding device for knock detection for an internal combustion engine are already known, signals for knock detection from the combustion chamber being detected within a certain time window.
  • signals for knock detection from the combustion chamber being detected within a certain time window.
  • Such signals can be optical signals, sound signals, pressure signals, light signals, electrical signals (for example from ion current measurement) or temperature signals.
  • the measures listed in the subclaims advantageously make further developments and improvements of the method and the device specified in the independent claim possible. It is particularly advantageous to carry out the shifting of the time window for the detection of signals at different signal sources, since the signals of different signal sources are affected by the different flammability and the different behavior when the fuel / air mixture burns through. It is furthermore advantageous to shift the time window as a whole, ie the start of the time window or the end of the time window, depending on the air ratio ⁇ , since in a first approximation the knocking event occurs with a time shift.
  • the length of the time window in which knocking events occur is influenced by the air ratio ⁇ , so that it is advantageous that the length of the time window is also changed when the time window is shifted. It is also beneficial that the values for the shift in the beginning and / or the end of the time window and / or the change in the size of the time window are stored as characteristic diagrams in the memory unit of a microcomputer, since this enables quick and easy access to the data. It is also advantageous that the start of the time window and / or the end of the time window and / or the duration of the time window are contained in characteristic diagrams, the areas of which are assigned load and / or speed ranges, in the memory unit of the microcomputer. Here too, quick and easy access to the data is possible.
  • FIG. 1 shows schematically a device for knock detection for an internal combustion engine.
  • FIG. 1 a device according to the invention for knock detection of an internal combustion engine is shown, which is described below.
  • This device according to the invention is able to carry out the method according to the invention for knock detection for an internal combustion engine.
  • the Knock sensors detect both signals from the combustion chamber of the cylinders and signals in the vicinity of the cylinders, and they can be arranged both in the combustion chamber and outside the combustion chamber.
  • Such sensors are, for example, pressure sensors for the combustion chamber pressure, ion current detections, acceleration sensors, optical sensors, microphones or piezoceramic sensors, which are attached, for example, in the cylinder head screw, the screw on the crankshaft main bearing, the spark plug, in the cylinder head gasket or on the engine block.
  • several knock sensors of the same type are provided, although it is also possible to provide only one knock sensor. A combination of different types of knock sensors is also conceivable.
  • the signals detected by the knock sensors are converted into electrical signals by the knock sensors 11, 12,... In and passed on to an evaluation circuit 20.
  • a multiplexer 21 is initially provided in the evaluation circuit 20, to which the signals of the individual knock sensors 11, 12,..., In are passed on.
  • the signal of a specific, definable knock sensor is selected by the multiplexer. This selection is controlled by the control unit 31 of the microcomputer 30, which is connected to the multiplexer 21.
  • the output signal of the multiplexer 21 is then passed on to an amplifier 23 in the evaluation circuit 20 and amplified there in accordance with the requirements of the further evaluation.
  • This amplified signal is then passed on to a bandpass filter 25, which selects a specific frequency band from the amplified signal.
  • the bandpass filter 25 thereby becomes a frequency band selected in which there are characteristic frequencies for knocking. This bandpass filtering can effectively block out interference signals that are in a different area.
  • the bandpass-filtered signal is passed on from the bandpass filter 25 to the rectifier 27 and rectified in the rectifier 27.
  • the rectified signal is then integrated by means of an integrator 29, so that a signal is now available which is characteristic of the intensity of knocking in a specific cylinder of the internal combustion engine.
  • the signal transmitted by the rectifier is only integrated during a specific time window, the time window, which is also called the measurement window, comprising a time period which is characteristic of the occurrence of knock signals. By selecting the time window, interference signals can be suppressed in the same way as for the selection of the frequency band.
  • the time window is specified by the control unit 31 of the microcomputer 30, the control unit 31 being connected to the integrator 29.
  • the integrated signal obtained in the evaluation circuit 20, hereinafter also referred to as a knock signal, is then passed on to a microcomputer 30, wherein it is first converted into a digital signal by means of an analog / digital converter (A / D converter) 33.
  • the digital knock signal is forwarded to a knock detection unit 35, which is also contained in the microcomputer 30.
  • the knock detection unit 35 the digitized knock signal is compared with a knock detection threshold value.
  • Knock detection unit 35 the knock detection threshold from a memory unit 37, which is also provided in the microcomputer 30. In a simple embodiment then a knock detected by the knock detection unit 35 when the digitized knock signal
  • Knock detection threshold is not exceeded, so the detects
  • Knock detection unit 35 that no knock has occurred.
  • the current digitized knock signal is currently UJJJT m ⁇ a reference value UREF a ⁇ - of the respective current cylinder is compared.
  • the comparison includes the determination of a relative knock intensity RKI, which results as the quotient of the current knock signal and the cylinder-specific reference value: jf vr _ INT, current u REF. Old
  • the relative knock intensity RKI is then in the knock detection unit 35 with a
  • Knock detection threshold compared. Again, knocking is detected by the relative knock intensity RKI when the knock detection threshold value is exceeded.
  • the knock detection threshold value is again provided by the memory unit 37.
  • the cylinder 37 provides a cylinder-specific knock detection threshold value for the current cylinder.
  • the cylinder-specific reference value UREF is required to calculate the relative knock intensity RKI, continuously based on the current operating state of the
  • a cylinder recognition unit 40 is provided in the internal combustion engine, with the aid of which it can be recognized in which cylinder combustion is currently taking place.
  • the cylinder recognition and assignment is preferably carried out using crankshaft sensors or camshaft sensors.
  • the information ascertained by the cylinder recognition unit 40 about the cylinder in which a combustion process is currently taking place is passed on both to the knock recognition unit 35 and to the memory unit 37 and a control unit 31 for the evaluation circuit 20, which is also contained in microcomputer 30.
  • Knock detection unit 35 the information about the current cylinder is required to provide the cylinder-specific reference value for calculating the relative knock intensity RKI.
  • the information about the current cylinder is used to pass on the knock detection threshold corresponding to the current cylinder to the knock detection unit 35.
  • the bandpass filter 25 of the evaluation circuit 20 is connected to the control unit 31, the pass band of the bandpass filter 25 being controlled by the control unit 31.
  • a speed sensor 50 is also provided in the internal combustion engine, which measures the current speed of the internal combustion engine. Sensors that are attached to the crankshaft are preferably used to measure the rotational speed. The information about the speed is passed on from the speed sensor 50 to the control unit 31 for the evaluation circuit.
  • the method for knock control according to the invention is now designed in such a way that the time window in which the integrator 29 of the evaluation circuit 20 integrates the signal received by the rectifier 27 changes depending on the realized air ratio in the respective current cylinder.
  • the air ratio in a cylinder is defined as the ratio of the actual amount of air in the respective cylinder and the amount of air that is required in the respective cylinder for stoichiometric combustion. This is particularly relevant in internal combustion engines with gasoline direct injection, in which in some operating modes the vehicle is operated with very lean mixtures, ie the air ratio ⁇ is greater than 1. Such operating modes are, for example, the stratified operating mode or the homogeneous / lean operating mode.
  • the operating modes that are operated with a homogeneous mixture can also have air ratios ⁇ that deviate from 1.
  • the differences in the air conditions result in the ignition angle being shifted, since the flammability of the mixture depends on the air ratio ⁇ .
  • knocking events are expected in a different period of time than with an air ratio ⁇ of 1. Since the blowing behavior is also changed with different air ratios ⁇ , the shift in the period in which knocking events are expected is not proportional to the shift in the ignition angle with respect to the air ratio ⁇ . So it’s important to keep the time window in which the integrator 29 integrates the signal coming from the rectifier 27, depending on the air ratio ⁇ realized in the respective cylinder.
  • the shift in the time window is calculated by the microcomputer 30 and passed on by the control unit 31 to the integrator 29.
  • the calculation of the respective air ratio ⁇ realized in the respective cylinder takes place in the torque structure of the microcomputer 30.
  • the torque structure calculates the fuel quantity to be injected into the respective cylinder from a driver's desired torque, which in turn results from the accelerator pedal position. This is particularly dependent on the operating mode used, which also u. a. is selected based on the driver's desired torque.
  • the following operating modes can be implemented: homogeneous operation, homogeneous / lean operation, shift operation and shift operation with heating. Other operating modes are conceivable.
  • a shift in the start of the time window is read out from a characteristic curve contained in the storage unit 37 depending on the air ratio ⁇ .
  • This characteristic curve is divided into individual areas with respect to the air ratio ⁇ , each area having a value for a shift in the start of the time window.
  • a value for the start of the time window is read out from a further map in the microcomputer 30 depending on the current load and / or the current speed. This map is divided into individual areas with respect to the load and / or the speed and each area is a value for the start of the time window assigned.
  • the value for the start of the time window from the load / speed-dependent characteristic map is added to the lambda-dependent displacement value for the start of the time window from the ⁇ -dependent characteristic curve.
  • the start of the time window for the knock signal in the respective cylinder results from this sum.
  • the size of the time window is not changed.
  • the method described in the previous section can also be used for the end of the time window.
  • a value for the end of the time window for determining the knock signal is read out from the storage unit 37 depending on the load and / or the speed.
  • a shift in the end of the time window depending on the air ratio ⁇ is read from a further characteristic curve contained in the storage unit 37. Again, both values are added and there is a resulting value for the end of the time window. If the size of the time window is known and not changed, the start of the time window can be calculated from this.
  • the size of the time window is also changed.
  • a map is stored in the memory unit 37, in which values for the change in the size of the time window are assigned to specific air ratio ranges.
  • a value for the change in the size of the time window can now be read out as a function of the respective realized air ratio ⁇ from this map, which is stored in the memory unit 37.
  • the size of the time window depends on the speed and / or the load, in which case the map is again stored in the memory unit 37.
  • the resulting size of the time window in turn results from the sum of the map value for the size of the time window and from the ⁇ -dependent map value for the change in the size of the time window.
  • the end or the beginning of the time window is then adjusted according to the size of the time window, starting from a specific start or end of the time window.
  • a change in the size of the time window is advantageous because the flammability of the mixture, which changes due to the change in the air ratio, and the changed blowing behavior also change the length of the period in which knocking events are expected.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

L'invention concerne un procédé et un dispositif correspondant de détection de cliquetis pour un moteur à combustion interne doté d'au moins un cylindre. Selon cette invention, des signaux émis en raison d'une combustion dans au moins un cylindre sont enregistrés dans une fenêtre temporelle déterminée. Cette fenêtre temporelle est modifiée en fonction de la proportion d'air lambda obtenue dans le cylindre concerné.
PCT/DE2001/002310 2000-08-25 2001-06-22 Procede de detection de cliquetis pour un moteur a combustion interne et dispositif correspondant Ceased WO2002016745A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000141777 DE10041777A1 (de) 2000-08-25 2000-08-25 Verfahren zur Klopferkennung für eine Brennkraftmaschine und entsprechnde Vorrichtung
DE10041777.9 2000-08-25

Publications (2)

Publication Number Publication Date
WO2002016745A2 true WO2002016745A2 (fr) 2002-02-28
WO2002016745A3 WO2002016745A3 (fr) 2002-06-20

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PCT/DE2001/002310 Ceased WO2002016745A2 (fr) 2000-08-25 2001-06-22 Procede de detection de cliquetis pour un moteur a combustion interne et dispositif correspondant

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DE (1) DE10041777A1 (fr)
WO (1) WO2002016745A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12298155B2 (en) * 2020-06-24 2025-05-13 Ams Sensors Singapore Pte. Ltd. Inductive position sensor device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501937B1 (de) 2006-08-24 2009-11-15 Avl List Gmbh Verfahren zur erkennung und vermeidung von verfrühten verbrennungsereignissen
DE102007050618B3 (de) 2007-10-23 2009-04-23 Continental Automotive Gmbh Verfahren und Vorrichtung zum Steuern einer Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755256A1 (de) 1997-12-12 1999-06-24 Daimler Chrysler Ag Verfahren zur Erkennung von klopfender Verbrennung aus einem Ionenstromsignal bei Brennkraftmaschinen mit elektronischer Zündzeitpunktverstellung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230316A (en) * 1990-04-27 1993-07-27 Hitachi, Ltd. Method and apparatus for detecting knock in an internal combustion engine
WO1999031384A1 (fr) * 1997-12-12 1999-06-24 Temic Telefunken Microelectronic Gmbh Procede de mesure de flux ionique dans des moteurs a combustion interne, et dispositif de mesure de flux ionique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755256A1 (de) 1997-12-12 1999-06-24 Daimler Chrysler Ag Verfahren zur Erkennung von klopfender Verbrennung aus einem Ionenstromsignal bei Brennkraftmaschinen mit elektronischer Zündzeitpunktverstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12298155B2 (en) * 2020-06-24 2025-05-13 Ams Sensors Singapore Pte. Ltd. Inductive position sensor device

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Publication number Publication date
DE10041777A1 (de) 2002-03-07
WO2002016745A3 (fr) 2002-06-20

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