WO2009050002A1 - Klopferkennungssystem sowie verfahren für eine verstärkungsregelung für ein klopfsignal - Google Patents
Klopferkennungssystem sowie verfahren für eine verstärkungsregelung für ein klopfsignal Download PDFInfo
- Publication number
- WO2009050002A1 WO2009050002A1 PCT/EP2008/062739 EP2008062739W WO2009050002A1 WO 2009050002 A1 WO2009050002 A1 WO 2009050002A1 EP 2008062739 W EP2008062739 W EP 2008062739W WO 2009050002 A1 WO2009050002 A1 WO 2009050002A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor signal
- gain
- knock
- signal
- providing
- Prior art date
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
Definitions
- the invention relates to a knock detection system for use with an internal combustion engine, e.g. in a motor vehicle. Furthermore, the invention relates to a method for amplifier control for an amplifier arrangement for amplifying the sensor signal of a knock sensor.
- the structure-borne sound signal which is used for the knock control of an internal combustion engine, varies greatly in amplitude over the entire load and speed range of the internal combustion engine due to the changing engine noise.
- the structure-borne noise signal is detected by a knock sensor that outputs a very small sensor signal of typically a few mV in the idling speed range and a sensor signal in the volts load range at nominal speed, for example in the volt range.
- the signal evaluation of the sensor signal is carried out in a control unit, wherein the control unit for evaluating the sensor signal must ensure that the sensor signal is still resolved in the small signal range with a sufficiently high accuracy in order to filter this.
- the sensor signal should only occupy part of the available evaluation range in the large signal range so that knocking burns, which are detected as an increased amplitude of the sensor signal relative to the basic signal level, do not exceed the detection range of the signal evaluation, which would result in significant signal portions being lost for knock detection.
- the sensor signals of the knock sensor are amplified or not depending on the height of the structure-borne sound signal or depending on the rotational speed of the internal combustion engine. Such control of the amplification amplifies the voltage signals in the case of small structure-borne sound signals and treats the voltage signals neutrally with large structure-borne sound signals.
- a method and a device for knock detection or knock control are known, wherein a sensor signal of a knock sensor is supplied to an amplifier and amplified there according to the requirement of further evaluation.
- the amplified signal is passed to an adjustable bandpass filter by selecting a frequency band in which the frequencies characteristic of the knocking are located. By this bandpass filtering, noise that is in another range can be effectively masked out.
- adjustable amplifiers which provide two or more different amplification factors to amplify the sensor signal for signal evaluation in an analog-to-digital converter into an optimum signal level range.
- a realization of such an adjustable amplifier for the analog sensor signal is complicated and error-prone in discrete circuit technology, in particular with two or more gain factors to be realized.
- an apparatus for providing an amplified sensor signal of a knock sensor comprises an analog amplifier for amplifying the sensor signal according to a first predefinable amplification factor; an analog-to-digital converter for digitizing the amplified sensor signal into a digitized sensor signal; a digital amplifier for amplifying the digitized sensor signal in accordance with a second predefinable amplification factor; and a control unit for providing the first and second amplification factors as a function of a basic sound level of the sensor signal, wherein the basic sound level corresponds to the proportion of the structure-borne sound signal generated during normal operation without knocking.
- the above device allows a simpler implementation of the first amplifier, which is usually designed exclusively as a hardware amplifier, because the number of gain factors to be realized by the hardware amplifier can be reduced.
- control unit can be designed to select an overall gain as a function of a basic sound level of the sensor signal.
- control unit may be designed to reduce the overall gain when the background noise level exceeds an upper threshold, and to increase when the background noise level falls below a lower threshold.
- control unit has a memory which contains an allocation table, with which the overall gain can be assigned to the basic sound level of the sensor signal.
- a first number of fixed amplification factors may be selectable as first amplification factors, wherein a second number of predefined amplification factors are selectable as second amplification factors, wherein the smallest occurring factor between two of the specified first amplification factors is greater than the smallest occurring factor between two of the specified second ones gains. That is, the jumps between the first gains are greater than the jumps between the second gains.
- a knock detection system including a knock detection unit for detecting knocking and providing a ground level level of the sensor signal and one of the above devices.
- a method for providing an amplified sensor signal of a knock sensor for operating a knock detection system.
- the method includes the steps of providing a sensor signal; the amplification of the sensor signal according to a first predetermined gain factor; digitizing the amplified sensor signal into a digitized sensor signal; amplifying the digitized sensor signal according to a second predefinable amplification factor; and providing the first and second amplification factor as a function of a basic sound level of the sensor signal, wherein the basic sound level corresponds to the proportion of the structure-borne sound signal generated during normal operation without knocking.
- an overall gain can be selected, wherein the overall gain is reduced when an upper threshold value is exceeded and is increased when it falls below a lower threshold value.
- a computer program including a program code which, when executed on a data processing unit, executes the above method.
- Fig. 1 is a knock detection system according to an embodiment of the invention
- FIG. 2 is a flow chart illustrating the method of setting the gains for the hardware amplifier and the software amplifier
- FIG 3 shows the function of the amplifier control device on the basis of a profile of a reference level determined from the amplified sensor signal.
- a knock detection system 1 having a knock sensor 2 to detect a structure-borne sound signal in an internal combustion engine.
- the structure-borne sound signal is an acoustic oscillation in the body of the internal combustion engine, which is detectable with a corresponding vibration sensor.
- the knock sensor 2 is implemented as an analogue sensor and provides a sensor signal in the form of an electrical variable, such as e.g. Voltage or current, available.
- the knock sensor 2 may be formed as a piezoelectric sensor, which provides the sensor signal as an oscillating voltage signal.
- the analog sensor signal of the knock sensor 2 is supplied to a first amplifier 3, which is designed as a hardware amplifier.
- the first amplifier 3 is formed either in an integrated form in an I C module or in discrete form on a printed circuit board as an analog circuit.
- the gain of the first amplifier 3 is adjustable so that its gain varies depending on a first gain value given by a first gain memory element 4.
- the amplified in the first amplifier 3 sensor signal is fed to an analog / digital converter 5, where it is sampled accordingly and converted into a digital sensor value.
- the digitized amplified sensor signal is fed to an evaluation device 6. leads, in which an evaluation of the digitized sensor signal is made. Furthermore, a bandpass filtering in the evaluation device 6 can be made.
- the digitized sensor signal is supplied by the evaluation device 6 to a second amplifier 7, which is provided as a digital amplifier or software amplifier.
- a software amplifier corresponds to an amplifier which amplifies the sensor signal by multiplying the value of the digitized sensor signal.
- the amplification factor of the second amplifier 7 is predetermined by a second amplification factor storage element 8.
- the digitized sensor signal amplified in the second amplifier 7 is then fed to a knock detection unit 9, in which the knock detection is carried out.
- a control unit 10 which adjusts the first and second gain factors in a corresponding manner.
- the control unit 10 receives from the knock detection unit 9 a level value for a background sound sensor signal which corresponds to the portion of the structure-borne sound signal which is generated during normal operation of the internal combustion engine without knocking. Depending on this level signal, the gains of the two amplifiers 3, 7 are set.
- a flowchart illustrates the operation of the control unit 10.
- the control unit 10 receives the level value Rkr from the knock detection unit 9 and checks in step S2 if the corresponding level value Rkr is less than a lower threshold Kru or greater than an upper threshold Kro is or whether it lies between the lower threshold Kru and the upper threshold Kro. If it is determined that the level value Rkr is between the upper and lower threshold values, the gain factors stored in the gain storage elements 4, 8 remain unchanged. If it is determined that the level value Rkr falls below a lower threshold value Kru, the overall gain must be increased and the first and the second amplification factor must be adjusted accordingly. The adjustment of the gain factors is performed according to a table which may be stored in a memory 11 in the control unit 10.
- the above table shows that the first amplifier 3 realized as a hardware amplifier can make two gains, namely a simple gain and a quadruple gain, depending on the first gain stored in the first gain memory element 4.
- the second amplifier 7 can realize three different amplification factors, 0.5, 1 and 2.
- step S3 The adjustment by falling below the lower threshold value Kru of the level value is carried out in step S3 by appropriate look-up in the table 11 stored in the control unit 10.
- step S4 the first and second gains are adjusted by looking up in table 11 if the level exceeds the upper threshold Kro.
- the upper and lower limit values Kru, Kro are set so that when knocking occurs in the engine, the knocking signal with respect to the fundamental sounding sensor signal can be detected so that the amplitude of the knocking signal does not drive the first booster 3 into saturation, or Evaluation range of the analog / digital converter 5 exceeds.
- FIG. 3 A possible variation of the level value provided to the control unit 10 is shown in FIG. 3 as the speed increases in the case of operating the internal combustion engine. It can be seen that the level value increases several times up to an upper threshold value Kro. Upon reaching the upper threshold value Kro, the overall gain is then reduced, as indicated in the table stored in the control unit 10. This can be seen in Fig. 3 by the stepwise drop of the level value. As the speed increases, the level value then rises again, starting from a level value between the two threshold values Kru, Kro, up to the upper switching threshold. With decreasing speed, a comparable behavior with respect to the lower threshold Km would be observed.
- the provision of both a hardware amplifier (first amplifier 3) and a software amplifier (second amplifier 7) is significantly less expensive, since the hardware amplifier can be made simpler, since the number of gain stages that are adjustable by the control unit 10 , can be reduced. In the present case, e.g. only two gain stages of the hardware amplifier provided.
- the software amplifier 7 makes it possible for the knock detection unit 9 to provide a normalized signal which lies in a value range which is favorable for fast data processing in the knock detection unit 9.
- the software amplifier 7 may be implemented together with the knock detection unit 9 and the control unit 10 by a common microprocessor and the like. However, it can also be provided that the software amplification of the second amplifier 7 is implemented in a separate unit from the knock detection unit 9.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010528351A JP5274566B2 (ja) | 2007-10-12 | 2008-09-24 | ノック検出システム及びノック信号の増幅制御の方法 |
US12/733,991 US8365579B2 (en) | 2007-10-12 | 2008-09-24 | Knock detection system and method for an amplifier control for a knock signal |
CN200880111170XA CN101821597B (zh) | 2007-10-12 | 2008-09-24 | 爆震识别系统及用于爆震信号的增益调节的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007049150.8 | 2007-10-12 | ||
DE102007049150A DE102007049150A1 (de) | 2007-10-12 | 2007-10-12 | Klopferkennungssystem sowie Verfahren für eine Verstärkungsregelung für ein Klopfsignal |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009050002A1 true WO2009050002A1 (de) | 2009-04-23 |
Family
ID=40352729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/062739 WO2009050002A1 (de) | 2007-10-12 | 2008-09-24 | Klopferkennungssystem sowie verfahren für eine verstärkungsregelung für ein klopfsignal |
Country Status (5)
Country | Link |
---|---|
US (1) | US8365579B2 (de) |
JP (1) | JP5274566B2 (de) |
CN (1) | CN101821597B (de) |
DE (1) | DE102007049150A1 (de) |
WO (1) | WO2009050002A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2116834A1 (de) * | 2008-05-07 | 2009-11-11 | Robert Bosch GmbH | Klopferkennungs- Vorrichtung und Verfahren für einen Verbrennungsmotor |
CA2784725A1 (en) * | 2010-01-20 | 2011-07-28 | Sem Aktiebolag | Device and method for analysing a performance of an engine |
JP5464202B2 (ja) * | 2011-12-12 | 2014-04-09 | 株式会社デンソー | 内燃機関の電子制御装置 |
JP6020955B2 (ja) * | 2012-06-11 | 2016-11-02 | 株式会社リコー | 画像形成装置 |
JP6350196B2 (ja) | 2014-10-14 | 2018-07-04 | 株式会社デンソー | 制御装置 |
KR102448373B1 (ko) * | 2015-06-15 | 2022-09-29 | 삼성디스플레이 주식회사 | 표시장치 및 표시장치 구동방법 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57203862A (en) * | 1981-06-08 | 1982-12-14 | Hitachi Ltd | Controlling device for knocking |
US4425891A (en) * | 1980-08-14 | 1984-01-17 | Hitachi, Ltd. | Engine knock control apparatus |
DE4409103A1 (de) * | 1993-03-26 | 1994-09-29 | Atlas Fahrzeugtechnik Gmbh | Verfahren zur Klopferkennung für eine fremdgezündete Brennkraftmaschine |
EP1126261A2 (de) * | 2000-02-15 | 2001-08-22 | Toyota Jidosha Kabushiki Kaisha | Verfahren und Vorrichtung zur Klopfregelung für Motoren |
US20040239421A1 (en) * | 2003-03-27 | 2004-12-02 | Realtek Semiconductor Corp. | Variable gain amplifier |
Family Cites Families (21)
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US4153020A (en) * | 1977-07-26 | 1979-05-08 | The United States Of America As Represented By The Administrator Of The United States Environmental Protection Agency | Method and apparatus for spark control of engine knock |
DE3137016C2 (de) * | 1981-09-17 | 1985-01-03 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zur Erkennung des Klopfens einer Brennkraftmaschine |
JPS5965225A (ja) * | 1982-10-05 | 1984-04-13 | Toyota Motor Corp | 内燃機関のノツキング検出装置 |
DE3319458A1 (de) * | 1983-05-28 | 1984-11-29 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und vorrichtung zur erkennung des klopfens einer brennkraftmaschine |
JPH0715424B2 (ja) * | 1983-08-05 | 1995-02-22 | 日本電装株式会社 | ノッキング検出装置 |
DE3342466A1 (de) * | 1983-11-24 | 1985-06-05 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zur erkennung klopfender verbrennungen bei brennkraftmaschinen |
ES2068283T3 (es) * | 1990-05-28 | 1995-04-16 | Siemens Ag | Procedimiento para la regulacion selectiva de cilindro del picado de motores de combustion interna. |
US5205258A (en) * | 1990-08-28 | 1993-04-27 | Mitsubishi Denki Kabushiki Kaisha | Knock suppressing apparatus and method |
JPH04143440A (ja) * | 1990-10-03 | 1992-05-18 | Mitsubishi Electric Corp | 内燃機関用ノック検出装置 |
KR940004351B1 (ko) * | 1990-09-27 | 1994-05-23 | 미쓰비시덴키가부시키가이샤 | 내연기관용 녹검출장치 |
JPH04186135A (ja) * | 1990-11-21 | 1992-07-02 | Hitachi Ltd | ノッキング検出装置 |
JP2546065B2 (ja) * | 1993-01-07 | 1996-10-23 | 日本電装株式会社 | ノッキング検出装置 |
DE4333965A1 (de) * | 1993-10-05 | 1995-04-06 | Bosch Gmbh Robert | Verfahren zur Klopferkennung |
JP2586415B2 (ja) * | 1993-11-29 | 1997-02-26 | 株式会社デンソー | 内燃機関用ノック制御装置 |
DE10021913A1 (de) * | 2000-05-05 | 2001-11-08 | Bosch Gmbh Robert | Verfahren zur Fehlererkennung bei der Auswertung von Sensorsignalen |
EP1309841B1 (de) | 2000-08-11 | 2005-09-14 | Robert Bosch Gmbh | Klopferkennung bei brennkraftmaschinen mit modifizierung bei änderung einer filtercharakteristik oder zylinderindividueller änderung |
CN100481729C (zh) * | 2005-10-09 | 2009-04-22 | 北京中星微电子有限公司 | 一种提高a/d转换器信噪比的方法及装置 |
CN1808285B (zh) * | 2006-01-26 | 2010-07-28 | 上海微电子装备有限公司 | 一种用于光刻机同轴对准的基于pga的高精度模数转换装置及其控制方法 |
US7254475B1 (en) * | 2006-02-07 | 2007-08-07 | Infineon Technologies Ag | Detection systems and methods |
FR2912185B1 (fr) * | 2007-02-05 | 2009-03-13 | Siemens Vdo Automotive Sas | Dispositif et procede de traitement de signaux de cliquetis d'un moteur a combustion interne, a reduction d'influence de bruits parasites |
EP2116834A1 (de) * | 2008-05-07 | 2009-11-11 | Robert Bosch GmbH | Klopferkennungs- Vorrichtung und Verfahren für einen Verbrennungsmotor |
-
2007
- 2007-10-12 DE DE102007049150A patent/DE102007049150A1/de not_active Ceased
-
2008
- 2008-09-24 WO PCT/EP2008/062739 patent/WO2009050002A1/de active Application Filing
- 2008-09-24 JP JP2010528351A patent/JP5274566B2/ja not_active Expired - Fee Related
- 2008-09-24 US US12/733,991 patent/US8365579B2/en not_active Expired - Fee Related
- 2008-09-24 CN CN200880111170XA patent/CN101821597B/zh active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4425891A (en) * | 1980-08-14 | 1984-01-17 | Hitachi, Ltd. | Engine knock control apparatus |
JPS57203862A (en) * | 1981-06-08 | 1982-12-14 | Hitachi Ltd | Controlling device for knocking |
DE4409103A1 (de) * | 1993-03-26 | 1994-09-29 | Atlas Fahrzeugtechnik Gmbh | Verfahren zur Klopferkennung für eine fremdgezündete Brennkraftmaschine |
EP1126261A2 (de) * | 2000-02-15 | 2001-08-22 | Toyota Jidosha Kabushiki Kaisha | Verfahren und Vorrichtung zur Klopfregelung für Motoren |
US20040239421A1 (en) * | 2003-03-27 | 2004-12-02 | Realtek Semiconductor Corp. | Variable gain amplifier |
Also Published As
Publication number | Publication date |
---|---|
CN101821597B (zh) | 2012-11-07 |
US8365579B2 (en) | 2013-02-05 |
DE102007049150A1 (de) | 2009-04-16 |
US20110030452A1 (en) | 2011-02-10 |
JP2011501110A (ja) | 2011-01-06 |
CN101821597A (zh) | 2010-09-01 |
JP5274566B2 (ja) | 2013-08-28 |
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