WO2022038851A1 - Dispositif et procédé de traitement de signal de cliquetis - Google Patents

Dispositif et procédé de traitement de signal de cliquetis Download PDF

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Publication number
WO2022038851A1
WO2022038851A1 PCT/JP2021/019269 JP2021019269W WO2022038851A1 WO 2022038851 A1 WO2022038851 A1 WO 2022038851A1 JP 2021019269 W JP2021019269 W JP 2021019269W WO 2022038851 A1 WO2022038851 A1 WO 2022038851A1
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Prior art keywords
signal
knocking
digital filter
correction
signal processing
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PCT/JP2021/019269
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English (en)
Japanese (ja)
Inventor
諭史 小島
好彦 赤城
伸也 眞戸原
宏典 高橋
淳史 小此木
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日立Astemo株式会社
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Priority to JP2022543284A priority Critical patent/JP7314420B2/ja
Publication of WO2022038851A1 publication Critical patent/WO2022038851A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups

Definitions

  • the present invention relates to a knocking signal processing device and a method, for example, to a function of correcting an input signal on engine control. Further, for example, the present invention relates to processing of a knocking signal for determining the occurrence of knocking from vibration generated by abnormal combustion of an engine.
  • the function of filtering signals on engine control is used for the input of various sensors.
  • the knocking signal filter is required to have advanced functions. The reason is that the gas in the combustion chamber vibrates due to the self-ignition of the unburned gas in the terminal part of the combustion chamber, and the phenomenon that this vibration is transmitted to the main body of the engine affects not only the combustion but also the vibration characteristics of the main body of the engine. Because. Knocking causes loss of energy generated by the engine (decrease in output), impact on each part of the engine, decrease in fuel consumption, etc., so it is desirable to avoid it as much as possible. For that purpose, it is desirable to accurately detect the occurrence of knocking.
  • this filter function is realized by a digital filter by software implemented in a microcomputer. Further, a method of configuring a digital filter as a function of a microcomputer is also known.
  • Patent Document 1 discloses a method for solving a response delay caused by a delay filter used for detecting BGL (background level).
  • the operating state of the engine is detected by the change of the engine speed, and the knocking determination threshold value is corrected based on the operating state.
  • a knocking frequency band which is a frequency band peculiar to knocking
  • a disturbance which is a frequency band peculiar to disturbance noise
  • the vibration signal is affected by factors such as the circuit configuration of the knocking detection control device, the connector, the harness, the circuit of the engine control device, the unique input impedance (internal impedance of the delta-sigma AD converter, etc.), the output impedance, and the like. Therefore, the measurement accuracy of the knocking signal varies from individual to individual.
  • the conventional technique has a problem that an additional circuit (for example, the voltage follower circuit described above) is required to improve the measurement accuracy of the knocking signal.
  • an additional circuit for example, the voltage follower circuit described above
  • An object of the present invention is to provide a knocking signal processing device and a method for suppressing variation among individuals and improving the measurement accuracy of a knocking signal without using an additional circuit.
  • An example of the knocking signal processing device is A knocking signal processing device that can be mounted on a vehicle.
  • AD converter A plurality of digital filters arranged after the AD converter and having different frequency characteristics,
  • the correction signal output unit that outputs the correction signal and Equipped with The knocking signal processing device is configured so that the outputs of the plurality of digital filters are changed according to the correction signal.
  • the knocking signal processing method according to the present invention is: It is a knocking signal processing method for vehicles.
  • AD converter A plurality of digital filters arranged after the AD converter and having different frequency characteristics, The output of the plurality of digital filters is modified according to the correction signal in the method performed using.
  • This specification includes the disclosure of Japanese Patent Application No. 2020-137428, which is the basis of the priority of the present application.
  • the knocking signal processing device and method according to the present invention since the output of the digital filter is changed according to the correction signal, the measurement accuracy of the knocking signal is suppressed by suppressing the variation among individuals without using an additional circuit. Can be improved.
  • the control configuration of the knocking signal processing apparatus according to the first embodiment.
  • the flowchart of correction control in 1st Embodiment. The graph which shows the passing characteristic and the signal strength of the digital filter explaining the correction control of FIG.
  • the flowchart of the correction control in the 2nd Embodiment. The graph which shows the passing characteristic and the signal strength of the digital filter explaining the correction control of FIG.
  • a control configuration of the knocking signal processing device according to the third embodiment.
  • the flowchart of the correction control in the 3rd Embodiment The graph which shows the passing characteristic and the signal strength of the digital filter explaining the correction control of FIG.
  • FIG. 1 is a diagram showing a control configuration of a knocking signal processing device according to a first embodiment of the present invention.
  • the knocking signal processing device can be mounted on a vehicle and measures the knocking signal of an internal combustion engine.
  • the knocking signal processing device is configured to execute a vehicle knocking signal processing method as described below.
  • the knocking signal processing device includes an ECU 100 and a correction signal output unit 10.
  • the correction signal output unit 10 is provided outside the ECU 100.
  • the ECU 100 is, for example, a computer having a known configuration. It may include a CPU and a memory. The program may be stored in the memory. By executing this program by the CPU, the computer may function as the ECU 100.
  • the correction signal functions as a reference signal used to correct the coefficient of the digital filter or its output.
  • the correction signal is a signal with a known frequency and signal strength.
  • a sine wave signal having a constant frequency and a constant amplitude can be used.
  • the ECU 100 includes a delta sigma AD converter 20 (AD converter) that converts an analog signal into a digital signal, and a digital filter processing unit 30 that is set as a BPF (bandpass filter) for passing a specific frequency band from the digital signal. ,
  • the arithmetic unit 50 is provided.
  • a correction signal is input to the delta-sigma AD converter 20.
  • a vehicle vibration signal (including a knocking signal) is input instead of the correction signal.
  • an analog signal can be directly used as an input to the ECU 100.
  • the digital filter processing unit 30 is arranged after the delta sigma AD converter 20.
  • the digital filter processing unit 30 includes a plurality of digital filters having different frequency characteristics.
  • the frequency characteristic is represented by, for example, the cutoff frequency, the pass band, and the like.
  • Each digital filter of the digital filter processing unit 30 extracts and outputs a signal strength 40 having a different frequency (or a frequency band including that frequency; the same applies hereinafter) from the output of the delta-sigma AD converter 20.
  • the arithmetic unit 50 acquires the signal strength difference 42 of each frequency based on the signal strength 40 of each frequency and the reference signal strength 41 of each frequency, and based on this, the coefficient of the digital filter of the digital filter processing unit 30 ( BPF coefficient) is changed. The processing at this time will be described below.
  • FIG. 2 is a flowchart of the correction control in the first embodiment
  • FIG. 3 is a graph showing the passing characteristics and signal strength of the digital filter for explaining the correction control in the first embodiment.
  • a correction signal is input to the delta-sigma AD converter 20 (S110).
  • the delta-sigma AD converter 20 takes in the correction signal, converts it into a digital signal, and outputs the digital signal (S120).
  • As the correction signal a frequency different from that of each digital filter is used as described later.
  • Subsequent processing is executed independently for each digital filter (that is, for each frequency).
  • the processing of each frequency may be executed in parallel or sequentially.
  • a digital filter having a center frequency of 7 kHz in the pass band will be described as an example, but the same applies to digital filters having other frequencies.
  • the arithmetic unit 50 selects the frequency to be processed (S131, 7 kHz in this example). Next, the arithmetic unit 50 selects a digital filter having that frequency, and as shown in FIG. 3A, the coefficient (gain) of the digital filter is set so that the passing characteristic (gain) of the digital filter with respect to the correction signal is 0 dB. BPF coefficient) is changed (S132).
  • the correction signal is a sine wave signal of 7 kHz in this example, and the coefficient of the digital filter is changed so that the gain at the output when this correction signal is input is 0 dB.
  • the coefficient expression method, coefficient calculation method, and coefficient setting method for the digital filter at this time can be designed based on known techniques. For example, it can be determined based on the specifications of the software constituting the digital filter processing unit 30.
  • the corresponding frequency is analyzed (S140).
  • a knocking signal having a corresponding frequency (7 kHz in this example) is input to the digital filter via the delta-sigma AD converter 20, and the signal strength of the output of the digital filter is detected.
  • the gain of the detected signal strength with respect to the knocking signal is -1 dB at 7 kHz.
  • the knocking signal As this knocking signal, the one measured in the actual environment in which the knocking signal processing device is installed can be used. That is, a knocking signal including variations due to factors such as the circuit configuration of the knocking signal processing device, the connector, the harness, the circuit of the engine control device, the unique input impedance (internal impedance of the delta sigma AD converter, etc.), the output impedance, etc. should be used. Can be done.
  • the actual vibration signal measured by the vibration sensor or the like may be input to the digital filter processing unit 30 via the delta-sigma AD converter 20. Further, the actual vibration signal may be recorded in advance and reproduced in S140.
  • the arithmetic unit 50 acquires the reference signal strength for that frequency (S141).
  • the reference signal strength represents, for example, a gain, and can be 0 dB for all frequencies, for example, as shown in FIG. 3 (b).
  • the arithmetic unit 50 acquires the difference between the gain (-1 dB) of the signal strength detected for the knocking signal and the gain (0 dB) of the reference signal strength (S142). Then, based on this difference, the coefficient of the digital filter is calculated so that the signal strength with respect to the knocking signal used in S140 matches the reference signal strength (S151). For example, it is calculated so that this difference is added or subtracted to the passing characteristics of the knocking signal at that frequency. As a result, as shown in FIG. 3D, the pass characteristic (gain) of the digital filter with respect to the correction signal is + 1 dB, and the pass characteristic (gain) of the digital filter with respect to the knocking signal is 0 dB.
  • the arithmetic unit 50 updates the calculated coefficient as the coefficient of the digital filter (S152). In this way, the correction control of FIG. 2 is completed.
  • the knocking signal is measured after the correction control
  • the actual vibration signal measured by the vibration sensor or the like is processed by the delta-sigma AD converter 20 and the digital filter processing unit 30 instead of the correction signal.
  • the arithmetic unit 50 detects knocking based on the output.
  • the specific processing content of the measurement of the knocking signal can be appropriately designed by a person skilled in the art based on a known knocking signal processing technique.
  • the knocking signal processing device is a knocking signal processing device that can be mounted on a vehicle and is arranged after the delta sigma AD converter 20 and the delta sigma AD converter 20.
  • a plurality of digital filters digital filter processing unit 30 having different frequency characteristics and a correction signal output unit 10 for outputting a correction signal are provided, and the outputs of the plurality of digital filters are configured to be changed according to the correction signal.
  • the output of each digital filter is configured to be changed according to the difference between the correction signal (ideal amplitude) and the actual knocking signal (measured amplitude).
  • each digital filter digital filter processing unit 30
  • the coefficient of each digital filter is changed based on the difference between the gain for the correction signal in each digital filter (digital filter processing unit 30) and the gain for the actually measured signal. It is not necessary to perform a correction calculation again for the output result of each digital filter (digital filter processing unit 30), and the actual measurement processing of the knocking signal is simplified.
  • the knocking signal processing device includes the ECU 100 and the correction signal output unit 10 is provided outside the ECU 100, it is not necessary to change the internal structure of the ECU 100, and the design or mounting is easy.
  • the correction signal is a sine wave signal having a constant frequency and a constant amplitude, it is easy to generate the correction signal.
  • the knocking signal processing device does not require an additional circuit such as a voltage follower circuit. Therefore, for example, the cost can be reduced, or the area occupied by the circuit can be made smaller.
  • the second embodiment of the present invention is the first embodiment in which the configuration for changing the output of the digital filter is changed.
  • the description of the parts common to the first embodiment may be omitted.
  • FIG. 4 is a flowchart of the correction control in the second embodiment
  • FIG. 5 is a graph showing the passing characteristics and signal strength of the digital filter for explaining the correction control in the second embodiment.
  • the processing of S110 to S131 can be the same as that of the first embodiment (FIG. 2).
  • the coefficient (BPF coefficient) of the digital filter is changed so that the pass characteristic (gain) of the digital filter with respect to the correction signal becomes 0 dB, and the output of the digital filter is obtained.
  • the correction coefficient is set to 0 dB (S133).
  • the "correction coefficient” means a coefficient used when the arithmetic unit 50 corrects the amplitude of the signal output from the digital filter.
  • the processing of S140 to S142 can be the same as that of the first embodiment (FIG. 2).
  • the gain of the detected signal strength as shown in FIG. 5 (c) is -1 dB at 7 kHz.
  • the reference signal strength (gain) can be set to 0 dB for all frequencies, for example, as shown in FIG. 5 (b).
  • the arithmetic unit 50 determines the correction coefficient for the output of the digital filter based on this difference (S153).
  • the correction coefficient is + 1 dB for 7 kHz.
  • the correction coefficient determined here is used to correct the output of the digital filter when actually measuring the knocking signal.
  • the arithmetic unit 50 further amplifies the output of the 7 kHz digital filter with respect to the actually input vibration signal by 1 dB, and measures the knocking signal based on the amplified signal. In this way, it is possible to obtain the same result as when the passing characteristics (gain) of the digital filter are substantially changed.
  • the knocking signal processing device is a knocking signal processing device that can be mounted on a vehicle as in the first embodiment, and is a delta sigma AD converter 20 and a delta sigma.
  • a plurality of digital filters (digital filter processing unit 30) arranged after the AD converter 20 and having different frequency characteristics, and a correction signal output unit 10 for outputting a correction signal are provided, and the output of each digital filter is used as a correction signal. It is configured to change accordingly. More specifically, the output of each digital filter is configured to be changed according to the difference between the correction signal (ideal amplitude) and the actual knocking signal (measured amplitude).
  • each digital filter is corrected based on the difference between the gain for the correction signal in each digital filter (digital filter processing unit 30) and the gain for the actually measured signal. Since the output of the digital filter (digital filter processing unit 30) is changed by executing the calculation, it is not necessary to set the coefficient itself of the digital filter (digital filter processing unit 30), and the digital filter (digital filter processing unit 30) does not need to be set. ) Can be omitted.
  • the knocking signal processing device includes the ECU 100 and the correction signal output unit 10 is provided outside the ECU 100, it is not necessary to change the internal structure of the ECU 100, and the design or mounting is easy.
  • the correction signal is a sine wave signal having a constant frequency and a constant amplitude, it is easy to generate the correction signal.
  • no additional circuit such as a voltage follower circuit is required. Therefore, for example, the cost can be reduced, or the area occupied by the circuit can be made smaller.
  • the correction signal is a constant frequency and constant amplitude sinusoidal signal.
  • the correction signal may be a signal having another shape.
  • the frequency of the correction signal may be configured to change with time.
  • the correction signal may be a frequency-variable signal that sweeps a predetermined frequency range (for example, a frequency range that covers the corresponding frequencies of all the digital filters of the digital filter processing unit 30). By doing so, the processing for each digital filter can be performed in order, and the design of the correction control is simplified.
  • the “sweep” is not limited to a continuous sweep, but includes a discrete sweep that outputs signals of each frequency in order for a plurality of discretized frequencies.
  • the third embodiment uses a BGL (background level) signal as a correction signal in the first embodiment or a modification thereof.
  • BGL background level
  • the BGL signal output unit 11 outputs a BGL signal.
  • the BGL signal is a vibration signal in a state where the vehicle is actually operating. Further, the BGL signal is a signal indicating a state in which knocking has not occurred.
  • Such a BGL signal can be prepared by actually measuring the vibration for each vehicle.
  • the BGL signal output unit 11 may include a vibration sensor 12, which measures vibration corresponding to the background level of vibration of the internal combustion engine and corrects a signal representing the measured vibration (BGL). It may be output as a signal).
  • the delta-sigma AD converter 20 and the digital filter processing unit 30 extract signal intensities 40 having different frequencies.
  • the arithmetic unit 50 acquires the BGL intensity difference 44 of each frequency based on the signal intensity 40 of each frequency and the reference BGL intensity 43 of each frequency, and based on this, the coefficient of the digital filter of the digital filter processing unit 30 ( BPF coefficient) is changed. The processing at this time will be described below.
  • FIG. 7 is a flowchart of the correction control in the third embodiment
  • FIG. 8 is a graph showing the passing characteristics and signal strength of the digital filter for explaining the correction control in the third embodiment.
  • the coefficient (BPF coefficient) of the digital filter is changed so that the passing characteristic (gain) of the digital filter becomes 0 dB (S132).
  • the coefficient is set so that the gain when a sine wave of that frequency is input is 0 dB without using the above-mentioned BGL signal.
  • the BGL signal from the delta-sigma AD converter 20 is input to the digital filter, and the signal strength (BGL strength) of the output of the digital filter with respect to this is detected (S143).
  • the gain of the detected BGL intensity is -9 dB at 7 kHz.
  • the arithmetic unit 50 acquires the reference BGL intensity for the frequency (S144).
  • the reference signal strength represents, for example, a gain, for example, -10 dB for 7 kHz, as shown in FIG. 8 (b).
  • the arithmetic unit 50 acquires the difference between the detected BGL intensity gain (-9 dB) and the reference BGL intensity gain (-10 dB) (S145). Then, based on this difference, the coefficient of the digital filter is calculated so that the detected BGL intensity matches the reference BGL intensity (S154). For example, it is calculated so that this difference is added or subtracted to the passing characteristics of the frequency. As a result, as shown in FIG. 8D, the passing characteristic (gain) of the digital filter for the 7 kHz sine wave signal is -1 dB. Although not shown, the pass characteristic (gain) of the digital filter with respect to the BGL signal is -10 dB.
  • the arithmetic unit 50 updates the calculated coefficient as the coefficient of the digital filter (S155). In this way, the correction control of FIG. 7 ends.
  • the knocking signal processing device is a knocking signal processing device that can be mounted on the vehicle as in the first and second embodiments, and is the delta sigma AD converter 20.
  • a plurality of digital filters (digital filter processing unit 30) arranged after the delta sigma AD converter 20 and having different frequency characteristics, and a correction signal output unit 10 for outputting a correction signal, and the output of each digital filter is It is configured to be changed according to the correction signal (that is, the BGL signal). More specifically, the output of each digital filter is configured to be changed according to the difference between the BGL signal (ideal amplitude) and the actual knocking signal (measured amplitude).
  • the correction signal output unit (BGL signal output unit 11) includes a vibration sensor 12, which measures vibration representing the background level of vibration of the internal combustion engine and outputs a signal representing vibration as a correction signal. Therefore, the coefficient of the digital filter can be optimized for the actual operating environment.
  • no additional circuit such as a voltage follower circuit is required. Therefore, for example, the cost can be reduced, or the area occupied by the circuit can be made smaller.
  • the third embodiment has been described as a modification to the first embodiment, it can also be implemented as a second embodiment or a modification thereof.

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

Abstract

L'invention concerne un dispositif et un procédé de traitement d'un signal de cliquetis, qui permettent d'améliorer la précision de mesure de signal de cliquetis en réduisant au minimum des variations entre des unités individuelles sans avoir recours à un circuit supplémentaire. Le dispositif de traitement de signal de cliquetis peut être monté sur un véhicule. Le dispositif de traitement de signal de cliquetis comporte : un convertisseur A/N delta-sigma 20; une pluralité de filtres numériques (unité de traitement à filtres numériques 30) qui ont des propriétés de fréquence différentes et qui sont chacun disposés à un étage à la suite du convertisseur A/N delta-sigma 20; et une unité de sortie de signal BGL 11 ou une unité de sortie de signal de correction 10 destinée à délivrer un signal de correction. Le dispositif de traitement de signal de cliquetis est conçu de façon à faire varier la sortie de l'unité de traitement à filtres numériques 30 en fonction du signal de correction.
PCT/JP2021/019269 2020-08-17 2021-05-20 Dispositif et procédé de traitement de signal de cliquetis WO2022038851A1 (fr)

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JP2020137428 2020-08-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005299579A (ja) * 2004-04-15 2005-10-27 Denso Corp 内燃機関のノック検出装置
WO2017141582A1 (fr) * 2016-02-16 2017-08-24 日立オートモティブシステムズ株式会社 Dispositif de détection de cliquetis, dispositif de commande de moteur à combustion interne
JP2018096255A (ja) * 2016-12-12 2018-06-21 日立オートモティブシステムズ株式会社 内燃機関のノッキング検出装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0635943B2 (ja) * 1990-08-01 1994-05-11 株式会社ユニシアジェックス 内燃機関のノッキング検出装置
JP4532348B2 (ja) 2005-06-06 2010-08-25 株式会社日本自動車部品総合研究所 内燃機関のノッキング制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005299579A (ja) * 2004-04-15 2005-10-27 Denso Corp 内燃機関のノック検出装置
WO2017141582A1 (fr) * 2016-02-16 2017-08-24 日立オートモティブシステムズ株式会社 Dispositif de détection de cliquetis, dispositif de commande de moteur à combustion interne
JP2018096255A (ja) * 2016-12-12 2018-06-21 日立オートモティブシステムズ株式会社 内燃機関のノッキング検出装置

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