Knock Frequency Distribution Pattern Responsive Patents (Class 123/406.38)
  • Patent number: 10920686
    Abstract: A method and a device for knock control of an internal combustion engine, a knock signal of a cylinder of the internal combustion engine being measured by a knock sensor and, on the basis thereof, a knock intensity is generated. The knock intensity is compared to a reference level in order to classify a combustion as a knocking or non-knocking combustion. Moreover, an arrangement is provided, which takes the level of the knock intensity into account for the determination of the reference level.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: February 16, 2021
    Assignee: Robert Bosch GmbH
    Inventors: Carsten Kluth, Matthias Biehl
  • Patent number: 10830659
    Abstract: The present invention relates to a method of controlling a positive-ignition internal combustion engine, in which the ignition advance is controlled (CON) by means of an estimation (EST) of the distribution of the knock measurements (MEAS). This estimation (EST) makes it possible to determine, for these measurements (MEAS), a confidence interval (qmin, qmax) of a predetermined quantile of the distribution of the knock measurements (MEAS).
    Type: Grant
    Filed: December 6, 2018
    Date of Patent: November 10, 2020
    Assignee: IFP ENERGIES NOUVELLES
    Inventors: Maxime Jean, Thomas Leroy, Fabien Vidal-Naquet
  • Patent number: 10300920
    Abstract: A method for vibration dampening of a drive train is disclosed. The method includes determining torsional parameters of the drive train via a state controller based on reconstructed torsional parameters of the at least one flywheel mass detected by at least one observer, determining the reconstructed torsional parameters based on disturbances in both (i) a load torque (Mlast) applied at an output of a torque transmission device and (ii) an induced torque (Mind) transmitted via the torque transmission device, determining a compensation torque via the state controller based on the reconstructed torsional parameters, and controlling an electric machine via the state controller based on the compensation torque to compensate torsional vibrations.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: May 28, 2019
    Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventor: Simon Schwunk
  • Patent number: 10197036
    Abstract: An operation status value detection unit detects two or more operation status values indicating an operation status of an internal combustion engine. A filtering processing unit applies filtering processing to the detected operation status values, and an operation status value difference calculation unit calculates the difference between the filter-processed operation status value and the corresponding non-filter-processed operation status value so as to calculate two or more operation status value differences. An operation status value difference normalization unit normalizes the two or more operation status value differences, based on predetermined reference values for the two or more operation status values, so as to calculate two or more normalized operation status value differences; and a transient correction unit corrects a control amount for controlling output of the internal combustion engine, based thereon, when the engine is in a transient-operation mode.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: February 5, 2019
    Assignees: Mitsubishi Electric Corporation, MAZDA MOTOR CORPORATION
    Inventors: Hideki Hagari, Yuhei Matsushima, Keitaro Ezumi, Tomokuni Kusunoki
  • Patent number: 10196997
    Abstract: An automotive internal combustion engine combusts an air/fuel mixture to generate a drive torque. An engine control unit (ECU) determines a torque request to output a fuel request signal indicative of an amount of the fuel to inject into a cylinder of the engine. The ECU includes neural network controller installed with a neural network to generate a fuel setpoint signal based on the torque request and to define a combustion model of the engine. The neural network generates a start of injection (SOI) signal indicating a start time at which to inject the fuel based a crankshaft angle. The ECU further outputs the fuel request signal based on the fuel setpoint and the SOI. A fuel injector injects the fuel into the cylinder based on the fuel request signal to generate the drive torque indicated by the torque request.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: February 5, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gennaro Merlino, Giuseppe Conte, Ezio Spessa, Roberto Finesso
  • Patent number: 10167784
    Abstract: Systems and methods for detecting a shaft shear event in a turbine engine. An accelerometer coupled to the engine detects an axial acceleration indicative of a shaft shear event in the engine. A control system is configured to, in response to the detected axial acceleration, transmit a signal to initiate a shut down of a fuel system of the engine.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: January 1, 2019
    Assignee: Pratt & Whitney Canada Corp.
    Inventor: Kevin Allan Dooley
  • Patent number: 9856812
    Abstract: A method for recognizing the type of fuel actually used in an internal combustion engine; the recognition method includes the steps of: sensing the intensity of the vibrations generated by the internal combustion engine within a measurement time window; determining the value of at least one synthetic index by processing the intensity of the vibrations generated by the internal combustion engine within the measurement time window; comparing the synthetic index with at least one predetermined comparison quantity; and recognizing the type of fuel actually used as a function of the comparison of the synthetic index to the comparison quantity; and forcedly altering, when detecting the intensity of the vibrations, the engine control with respect to the normal standard engine control, so as to enhance the behavioral differences of the different types of fuel that can be used by the internal combustion engine.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: January 2, 2018
    Assignee: Magneti Marelli S.p.A.
    Inventors: Nicola Garagnani, Riccardo Lanzoni, Marco Pastorelli, Filippo Cavanna
  • Patent number: 9824060
    Abstract: The present tool and method relate to device fault detection, diagnosis and prognosis. More particularly, the present tool and method store in a database a plurality of measured indicators representative of at least one dynamic condition of the device. The present tool and method further binarize by a processor the plurality of measured indicators, and analyze the plurality of binarized measured indicators using a machine learning data tool for extracting at least one pattern from the binarized measured indicators by adding at least one different constraint to each iteration. The at least one extracted pattern is indicative of whether the device has a fault or not.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: November 21, 2017
    Assignee: POLYVALOR, LIMITED PARTNERSHIP
    Inventors: Soumaya Yacout, David Salamanca, Mohamad-Ali Mortada
  • Patent number: 9446768
    Abstract: Vehicle operating systems are autonomously operated. A transient in an upcoming path of the vehicle is determined from a comparison of vehicle path data and vehicle status data to a threshold of mechanism first operating system. Operational parameters for one of first and second operating systems are selected according to the comparison. The selected operational parameters are applied to the operation of the one of the first and second operating systems.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: September 20, 2016
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Christopher Attard, Dale Scott Crombez, Jerome Charles Ivan, John P. Joyce, James Robert McBride, Wayne Williams, Paul Joseph Szuszman, Peter Worrel, Hai Yu, John Shutko, Jeff Allen Greenberg, Rajit Johri, Devinder Singh Kochhar, Hongtei Eric Tseng, Douglas Scott Rhode
  • Patent number: 9316556
    Abstract: A knock control apparatus for an internal combustion engine can remove regularly generated noise vibration in a simple and appropriate manner. The apparatus includes a knock sensor, a crank angle sensor, a vibration waveform detection unit that detects a vibration waveform of a knock natural frequency component, a vibration waveform average value calculation unit that calculates a vibration waveform average value corresponding to a noise vibration waveform by filtering the vibration waveform over a plurality of ignition cycles, a noise vibration waveform removal unit that removes the noise vibration waveform by subtracting the vibration waveform average value from the vibration waveform, a knock determination threshold value calculation unit that calculates a threshold value based on a peak value of the vibration waveform after removal of the noise vibration waveform, and a knock determination unit that determines whether a knock has occurred, by comparing the peak value with the threshold value.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: April 19, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yuhei Matsushima
  • Patent number: 9304033
    Abstract: Method for analyzing the condition of a machine having a slowly rotating part, includes: rotating a rotatable part at a rotational speed of less than 50 rpm; generating an analogue electric measurement signal dependent on mechanical vibrations emanating from rotation of a shaft using a sensor having mechanical characteristics causing it to resonate at a certain resonance frequency; sampling the analogue measurement signal at a sampling frequency to generate a digital measurement data sequence in response to the received analogue measurement data; digitally filtering the digital measurement data sequence to obtain a filtered measurement signal and achieve a signal having a bandwidth between an upper and a lower frequency which is lower than the certain resonance frequency and the upper frequency being higher than the certain resonance frequency; generating a digitally enveloped signal in response to the filtered measurement signal by digitally rectifying the filtered measurement signal, and by digital low p
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: April 5, 2016
    Assignee: S.P.M. INSTRUMENT AB
    Inventor: Lars-Olov Elis Hedin
  • Patent number: 9303572
    Abstract: A microcomputer is formed of a CPU and a detection circuit and inputs sensor signals of a vibration sensor and a rotation sensor. The detection circuit includes an AD converter circuit for AD conversion of the sensor signal of the vibration sensor at a predetermined sampling interval, a peak hold circuit for detecting a peak value of the sensor signal, a RAM for storing the peak value, a counter for detecting a crank angle at a peak value detection time, and an angle calculation part. The microcomputer divides a pre-ignition check interval into plural interval units and checks the pre-ignition based on the peak value detected in each unit interval. The pre-ignition and the knock are checked by using different threshold values in an interval, in which the pre-ignition check interval overlaps a knock check interval.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: April 5, 2016
    Assignee: DENSO CORPORATION
    Inventors: Daisuke Kawakami, Akito Itou, Ryotaro Kuno
  • Patent number: 9226183
    Abstract: The embodiments disclosed relates to a method and a network node that estimates a signal power and/or noise power of a received reference signal. The receiving node may operate in a communications system applying frequency division multiplexing. An assumption is that the channel frequency responses, on adjacent subcarriers of the communications system are equivalent or constant. The method comprising receiving a reference signal comprising a first reference signal from a first wireless terminal and a second reference signal from a second wireless terminal By using this assumption it is possible to combine first and second reference signal in order to estimating the signal power and/or noise power of a received reference signal without a conventional channel estimation technique.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: December 29, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Jinliang Huang, Ying Sun, Yu Yang, Lusheng Lucius Yu, Huaisong Zhu
  • Patent number: 9140229
    Abstract: A knocking control system comprises a knocking determiner device for determining whether or not knocking with a predetermined intensity or higher has occurred in a cylinder of a gas engine in each cycle; an integration variable calculator which adds to an integration variable CT when the knocking determiner device determines that the knocking with the predetermined intensity or higher has occurred, and subtracts from the integration variable CT when the knocking determiner determines that the knocking with the predetermined intensity or higher has not occurred; and a main controller for reducing a power output of the cylinder if the integration variable CT is not less than a threshold.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: September 22, 2015
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
  • Patent number: 8783226
    Abstract: A knocking control system for a gas engine of the present invention, being configured to calculate a knocking occurrence ratio (SEV) which is a ratio of a cycle number of cycles in which a predetermined knocking occurs for a period of the cycles of the predetermined cycle number, to the predetermined cycle number, decide a target value of an ignition timing of the ignition device based on a deviation (?SEV) between an occurrence ratio delay calculation value (SEVAVE) obtained by performing delay calculation of the knocking occurrence ratio and a predetermined occurrence ratio target value (SEVSET), and drive the ignition device so that the ignition timing reaches a command value (IGN) decided according to the target value.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: July 22, 2014
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Tsukasa Imamura, Tomohiko Sugimoto, Tetsuo Tokuoka, Hiroyoshi Ishii
  • Patent number: 8635005
    Abstract: A control device of an internal combustion engine includes a filter processing portion which performs a filter processing on the vibration level extracted by the vibration level extraction portion, and calculates a vibration level after the filter processing; and an abnormal ignition suppression control portion which compares the vibration level after the filter processing to the abnormal ignition determination value when a retard correction equal to or greater than a predetermined value is performed by the knock control portion, in a case where it is determined that the vibration level after the filter processing is equal to or greater than the abnormal ignition determination value, determines that the abnormal ignition is generated in the internal combustion engine, corrects and controls the combustion control portion in a direction of suppressing the abnormal ignition.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: January 21, 2014
    Assignees: Mitsubishi Electric Corporation, Mazda Motor Corporation
    Inventors: Hideki Hagari, Tomokazu Makino, Keitaro Ezumi, Tomokuni Kusunoki
  • Patent number: 8527187
    Abstract: A control system for a vehicle is provided. The control system includes a signal processing module that receives a sensor signal and extracts a plurality of sample points from the sensor signal. A computation module computes a summation of the sample points, computes a summation of squares of the sample points, and computes a standard deviation based on the summation of the sample points and the summation of the squares of the sample points. A control module generates a control signal based on the sensor signal and the standard deviation.
    Type: Grant
    Filed: March 13, 2007
    Date of Patent: September 3, 2013
    Inventors: Wajdi B. Hamama, John F. Van Gilder
  • Publication number: 20120266844
    Abstract: A control device of an internal combustion engine includes a filter processing portion which performs a filter processing on the vibration level extracted by the vibration level extraction portion, and calculates a vibration level after the filter processing; and an abnormal ignition suppression control portion which compares the vibration level after the filter processing to the abnormal ignition determination value when a retard correction equal to or greater than a predetermined value is performed by the knock control portion, in a case where it is determined that the vibration level after the filter processing is equal to or greater than the abnormal ignition determination value, determines that the abnormal ignition is generated in the internal combustion engine, corrects and controls the combustion control portion in a direction of suppressing the abnormal ignition.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 25, 2012
    Applicants: MAZDA MOTOR CORPORATION, MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hideki HAGARI, Tomokazu MAKINO, Keitaro EZUMI, Tomokuni KUSUNOKI
  • Patent number: 8291888
    Abstract: A system and method for controlling knock according to vehicle speed is disclosed. A knock control system has at least two settings, a first setting used for a first speed range and a second setting used for a second speed range. In another embodiment, knock may be controlled according to ambient noise measured directly within the motor vehicle.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: October 23, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventor: Edwin Itano
  • Patent number: 8109253
    Abstract: Methods for ascertaining the combustion noises of an internal combustion engine need only a structure-borne noise sensor and may be carried out using little computing power.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: February 7, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Matthias Schueler, Michael Kessler, Mohamed Youssef, Arnold Engber, Axel Loeffler
  • Patent number: 8109254
    Abstract: A method of controlling the spark lead of an internal combustion engine having at least one cylinder fitted with a spark plug; the method including the steps of: determining a standard spark lead value; determining an engine knock index in the cylinder; calculating a correction factor as a function of the engine knock index; determining a modified spark lead value by applying the correction factor to the standard spark lead value; and controlling the spark plug using the modified spark lead value. The correction factor is calculated by statistically analyzing a number of engine knock indexes to calculate a cumulative distribution; comparing the cumulative distribution with at least one target value; and modifying the current correction factor value as a function of the comparison between the cumulative distribution and the target value.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: February 7, 2012
    Assignee: Ferrari, S.p.A.
    Inventors: Giacomo Po, Nicolo′ Cavina, Luca Poggio
  • Patent number: 8103432
    Abstract: Knocking control is performed using a data group of serial segments each including a predetermined number of values obtained by A/D-converting a signal that appears within a knocking detection window and a data group consisting of serial segments each including the predetermined number of values. The starting timing is shifted and a time-frequency analysis is applied to the data groups in a plurality of frequency bandwidths. Peak values and integration values of spectrums, within the knocking detection window, outputted after the time-frequency analysis in each of the frequency bandwidths are calculated. A P/H method is performed based on the peak value in each of the frequency bandwidths and an integration method is performed based on the integration value in each of the frequency bandwidths for a knocking determination. If knocking is detected through at least one of the methods, the ignition timing is delayed in order to avoid the knocking.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: January 24, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventor: Toshikatsu Saito
  • Patent number: 8000884
    Abstract: A device and associated method for controlling ignition timing of an internal combustion engine are provided. By comparing a determination value and knock magnitude, determination of knocking is made, and ignition timing is advanced or retarded. The device includes an operation unit that sets a correction amount of the determination value to a value corresponding to a degree of change of the determination value over time. The operation unit calculates, at a first timing, a first value related to an average value of the determination values; and calculates, at a second timing later than the first timing, a second value related to the average value of the determination values. The degree of change of the determination value is calculated as a difference between the first value and the second value.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: August 16, 2011
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.
    Inventors: Koji Aso, Kenji Kasashima, Rihito Kaneko, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Patent number: 7963269
    Abstract: A 90° integrated value calculating unit of an engine ECU calculates a 90° integrated value obtained by integrating a magnitude. A calculating unit calculates a knock magnitude by dividing 90° integrated value by a BGL. A value obtained by subtracting a standard deviation ? from a median value of 90° integrated value is determined as the BGL. An ignition timing control unit controls the ignition timing depending on whether knock magnitude is equal to or larger than a determination value. A median value calculating unit calculates median value of 90° integrated value. A standard deviation calculating unit calculates standard deviation of 90° integrated value. A first stop unit stops updating of median value and standard deviation when 90° integrated value is smaller than a first threshold value or is equal to or larger than a second threshold value.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: June 21, 2011
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Hiroto Tanaka, Satoshi Watanabe, Norihito Hanai, Yasuhiro Yamasako, Kenji Senda, Satoshi Masuda
  • Patent number: 7853400
    Abstract: A knock control apparatus includes: a knock sensor for detecting knock of an internal combustion engine; a signal processing section for calculating a knock intensity; and knock determination level setting sections: for calculating an average value of the knock intensity; for calculating, based on the average value, an overall variance of the knock intensity of an entirety of a frequency distribution, a higher variance of the knock intensity above the average value, and a lower variance of the knock intensity below the average value; for calculating a standard deviation of the knock intensity from the overall variance; for presetting a value allowing the frequency distribution of the knock intensity to be a predetermined confidence interval as a confidence coefficient; and for setting a sum of the average value and a value obtained by multiplying the standard deviation by the corrected confidence coefficient as a knock determination level.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: December 14, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuhei Matsushima, Hideki Hagari, Keitaro Ezumi, Tomokuni Kusunoki
  • Patent number: 7822533
    Abstract: An engine ECU executes a program including a step of setting a search range of the crank angle of a peak value P that is the largest integrated value in a vibration waveform of an engine detected by calculating integrated values that are integrals of output voltage values of a knock sensor for every five degrees of a crank angle such that the search range may include the crank angle increasing with increase in engine speed NE, and a step of detecting the crank angle of the largest integrated value in the search range, and setting the detected crank angle as the crank angle of peak value P in the vibration waveform. At the crank angle based on the crank angle of peak value P, the vibration waveform is compared with a knock waveform model.
    Type: Grant
    Filed: May 28, 2007
    Date of Patent: October 26, 2010
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc
    Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Kenji Senda, Yuuichi Takemura, Shuhei Oe
  • Patent number: 7788022
    Abstract: Provided is a control apparatus for an internal combustion engine with which temporal and frequency resolutions necessary for analysis of a frequency of knock by digital signal processing are ensured with limited amounts of processing and memory. The control apparatus includes a lowpass filter for eliminating a high frequency component of an output signal from a knock sensor or a cylinder internal pressure sensor, an A/D conversion unit for performing A/D conversion on the output signal from the filter, and DFT processing units for performing digital signal processing on data obtained by the A/D conversion as knock detection units, each of the DFT processing units includes observation interval setting units for dividing the A/D-converted data to set observation intervals each containing a predetermined number of samples, and a multi-frequency simultaneous analysis unit for simultaneously analyzing multiple frequencies by a discrete Fourier transform for each of the set observation intervals.
    Type: Grant
    Filed: August 11, 2008
    Date of Patent: August 31, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventor: Hideki Hagari
  • Patent number: 7769536
    Abstract: An engine control system includes a digital signal processing (DSP) module that generates a fast Fourier transform (FFT) of an engine knock signal generated by an engine knock sensor. An intensity determination module determines an engine knock intensity based on one of a maximum of and an average of the FFT. A status determination module determines a status of the engine knock sensor based on the engine knock intensity, a plurality of predetermined knock intensity thresholds, and a rotational speed of an engine crankshaft.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: August 3, 2010
    Inventors: Wajdi B. Hamama, Craig M. Sawdon, Robert J. Horner, Eric Ferch, Hamid M. Esfahan
  • Publication number: 20100018500
    Abstract: A system and method for controlling knock according to engine speed is disclosed. A knock control system has at least two settings, a first setting used for a first speed range and a second setting used for a second speed range. In another embodiment, knock may be controlled according to ambient noise measured directly within the motor vehicle.
    Type: Application
    Filed: August 29, 2008
    Publication date: January 28, 2010
    Applicant: Honda Motor Co., Ltd.
    Inventor: Edwin Itano
  • Patent number: 7653477
    Abstract: An engine ECU executes a program including: determining whether or not a condition for stopping knocking determination is satisfied; setting a flag of stopping correction of a determination value to “ON”; calculating a knock determination level based on the extracted magnitude value; and when the correction stop flag is not “ON”, decreasing or increasing the determination value in accordance with a knock proportion KC that is a proportion of magnitude values greater than the knock determination level. The knock determination level is calculated even when the correction stop flag is “ON”.
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: January 26, 2010
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.
    Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Koji Aso, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Patent number: 7578282
    Abstract: In a knock sensor signal processing apparatus, a first apparatus which receives an engine knock sensor signal performs A/D conversions of the signal with a predetermined period and transmits successive pluralities of A/D values in parallel, by serial data communication, to a second apparatus in response to respective commands received from the second apparatus. The number of communication lines provided for transmitting the A/D values is made greater than those for transmitting commands from the second apparatus to the first apparatus, so that a high A/D conversion frequency together with low data rate of transmitting the A/D values can be achieved, thereby reducing communication-generated noise.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: August 25, 2009
    Assignee: Denso Corporation
    Inventor: Takayoshi Honda
  • Publication number: 20090165746
    Abstract: An engine ECU executes a program including: a step (S310) of multiplying a correction amount of a determination value V(KX) by Q, when deviation L between an approximation value V(R), which is an average value of determination values V(KX) corrected according to the occurrence frequency of knocking, and an approximation value V(R?1) previously calculated is greater than a predetermined value (NO in S306) or when the number of times where deviation L is determined to be smaller than a predetermined value is smaller than a predetermined number of times (NO in S308); and a step (S312) of multiplying the correction amount of the determination value V(KX) by 1/P, when the number of times where the deviation L is determined to be smaller than a predetermined value is greater than a predetermined number of times (YES in S308). By comparing the determination value V(KX) and knock magnitude, determination of knocking is made, and ignition timing is advanced or retarded.
    Type: Application
    Filed: December 8, 2006
    Publication date: July 2, 2009
    Applicants: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.
    Inventors: Koji Aso, Kenji Kasashima, Rihito Kaneko, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Publication number: 20090120410
    Abstract: A 90° integrated value calculating unit of an engine ECU calculates a 90° integrated value obtained by integrating a magnitude. A calculating unit calculates a knock magnitude by dividing 90° integrated value by a BGL. A value obtained by subtracting a standard deviation ? from a median value of 90° integrated value is determined as the BGL. An ignition timing control unit controls the ignition timing depending on whether knock magnitude is equal to or larger than a determination value. A median value calculating unit calculates median value of 90° integrated value. A standard deviation calculating unit calculates standard deviation of 90° integrated value. A first stop unit stops updating of median value and standard deviation when 90° integrated value is smaller than a first threshold value or is equal to or larger than a second threshold value.
    Type: Application
    Filed: October 31, 2008
    Publication date: May 14, 2009
    Inventors: Rihito Kaneko, Hiroto Tanaka, Satoshi Watanabe, Norihito Hanai, Yasuhiro Yamasako, Kenji Senda, Satoshi Masuda
  • Patent number: 7500468
    Abstract: An engine ECU executes a program including the steps of: determining that the condition that there is a possibility of occurrence of knocking is satisfied, based on the result of comparison between a vibration waveform of an engine and a knock waveform model; calculating a 40CA integrated value by integrating magnitudes of vibration occurring in the engine for a range of crank angle of 40°; calculating a knock magnitude N by dividing the 40CA integrated value by a BGL; determining that knocking has occurred when the knock magnitude N is larger than a determination value V(KX); and determining that knocking has not occurred when the knock magnitude N is smaller than the determination value V(KX).
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: March 10, 2009
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
  • Patent number: 7478624
    Abstract: An engine ECU executes a program including a step of calculating intensity values LOG(V), a step of detecting vibration waveforms, a step of calculating a correlation coefficient K based on vibration waveforms, a step of preparing frequency distribution of intensity values LOG(V) smaller than a threshold V(1) and intensity values LOG(V) in an ignition cycle where correlation coefficient K is larger than a threshold K(1), a step of calculating a knock determination level V(KD) based on a median V(50) and a standard deviation ? of intensity values LOG(V), and a step of counting the number of intensity values LOG(V) larger than knock determination level V(KD) as the number of times that knocking has occurred.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: January 20, 2009
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Koji Aso, Kenji Senda, Shigeru Kamio, Yuichi Takemura
  • Patent number: 7478622
    Abstract: An engine ECU executes a program including the steps of: calculating a magnitude value LOG(V) by logarithmically converting a magnitude V of vibration occurring in an engine, calculating a median V(50) and a standard deviation ? of magnitude values LOG(V); and setting, to the product of the standard deviation ? and a factor A, a first upper limit of a determination value V(KX) that is to be compared with a knock magnitude N for determining whether or not knocking has occurred, and setting a first lower limit of the determination value V(KX) to the product of the standard deviation ? and a factor B.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: January 20, 2009
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
  • Patent number: 7467040
    Abstract: A method of real-time estimation of indicators of the engine combustion state from signals containing oscillating components. A signal, such as a vibration signal for example, correlated with the engine combustion, is acquired as a function of time or of the crank angle. Real-time filtering and time-frequency analysis of this signal is carried out and indicators of the combustion state are estimated in real time from this analysis. The method has application for combustion control of an internal-combustion engine.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: December 16, 2008
    Assignee: IFP
    Inventors: Stéphan Ker, Laurent Duval
  • Patent number: 7441543
    Abstract: An engine ECU executes a program including a step of calculating a correlation coefficient K representing a degree of agreement between a vibration waveform and a knock waveform model, a step of calculating a knock magnitude N by dividing a peak value P of magnitude in the vibration waveform by BGL, a step of determining whether knocking has occurred based on a combination of the correlation coefficient K and the knock magnitude N, in such a manner as to determine that knocking has not occurred in at least one of the case where the correlation coefficient K is smaller than a threshold value K(1) and the case where the knock magnitude N is smaller than a threshold value N(1), and a step of retarding ignition timing by a retarding amount corresponding to the combination of the correlation coefficient K and the knock magnitude N, if knocking has occurred.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: October 28, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.
    Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Kenji Senda, Yuuichi Takemura, Shuhei Oe
  • Patent number: 7424820
    Abstract: An engine ECU executes a program including a step of calculating intensity values LOG(V) based on signals transmitted from a knock sensor; a step of deciding a maximum value V(MAX) in frequency distribution of intensity values LOG(V) for N cycles (N is a natural number); a step of calculating a knock determination level V(KD) based on the frequency distribution; a step of, when the knock determination level V(KD) is smaller than the maximum value V(MAX), removing V(MAX) from the frequency distribution; and a step of counting the total frequency of removed maximum values V(MAX) as knock occupancy KC. Maximum values V(MAX) are removed until the knock determination level V(KD) and the maximum value V(MAX) coincide, and the knock determination level V(KD) is recalculated.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: September 16, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.
    Inventors: Kiyoshi Iwade, Nobuyuki Murate, Shuhei Oe, Rihito Kaneko, Kenji Kasashima, Yuichi Takemura
  • Patent number: 7392788
    Abstract: An engine ECU executes a program including a step of, when an absolute value of a difference between median value V(50) of magnitude values LOG(V), which is obtained by logarithmically converting a magnitude V detected based on a signal sent from a knock sensor, and a determination value V(KX) used for determining presence or absence of knocking is greater than the product of a standard deviation ? and a coefficient U(3) in a frequency distribution of magnitude values LOG(V) for N cycle(s), setting a value obtained by adding the product of the standard deviation ? and the coefficient U(3) to the median value V(50) of magnitude values LOG(V) as the determination value V(KX).
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: July 1, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Patent number: 7363142
    Abstract: An engine ECU executes a program including the steps of: calculating a magnitude value LOG(V) from a magnitude V detected using a knock sensor; calculating a median value V(50) and a standard deviation a of calculated magnitude values LOG(V); calculating a knock determination level V(KD) that is a value obtained by adding the product of standard deviation a and a coefficient U(3) to median value V(50); and when knock determination level V(KD) is greater than the product of determination value V(KX) and a coefficient K, decreasing determination value V(KX). When a knock magnitude N calculated using magnitude V is greater than determination value V(KX), ignition timing is retarded.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: April 22, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Patent number: 7334568
    Abstract: In addition to a knock detection filter, a plurality of optimal knock frequency detection filters (digital filters: BPFs) are provided which filter the signals output from a knock sensor and has mutually different filtering frequency bands. A presently optimal frequency is selected based on the signals extracted by the optimal frequency detection filters, and set as the center frequency of the filtering frequency band of the knock detection filter.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: February 26, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Daisuke Kobayashi, Satoshi Masuda
  • Patent number: 7281516
    Abstract: An engine ECU executes a program including the steps of: comparing a vibration waveform of an engine and a knock waveform model stored in advance to calculate a correlation coefficient K; prohibiting correction when a correction prohibiting condition of a determination value V(KX) is satisfied, the determination value V(KX) compared with a knock magnitude N calculated from the correlation coefficient K so as to control the ignition timing; and correcting the determination value V(KX) based on a magnitude value LOG(V) calculated from a magnitude V of vibration in an ignition cycle in which the correlation coefficient K greater than a threshold value K(1) is calculated when the correction prohibiting condition of determination value V(KX) is not satisfied. The correlation coefficient K is calculated as a smaller value when the vibration waveform includes a waveform of vibration of a noise component as compared with that when the vibration waveform does not include it.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: October 16, 2007
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Koji Aso, Kenji Senda, Shigeru Kamio, Yuichi Takemura
  • Publication number: 20070215109
    Abstract: An engine ECU executes a program including a step of, when an absolute value of a difference between median value V(50) of magnitude values LOG(V), which is obtained by logarithmically converting a magnitude V detected based on a signal sent from a knock sensor, and a determination value V(KX) used for determining presence or absence of knocking is greater than the product of a standard deviation ? and a coefficient U(3) in a frequency distribution of magnitude values LOG(V) for N cycle(s), setting a value obtained by adding the product of the standard deviation ? and the coefficient U(3) to the median value V(50) of magnitude values LOG(V) as the determination value V(KX).
    Type: Application
    Filed: February 26, 2007
    Publication date: September 20, 2007
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Rihito KANEKO, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Publication number: 20070215108
    Abstract: An engine ECU executes a program including the steps of: calculating a magnitude value LOG(V) from a magnitude V detected using a knock sensor; calculating a median value V(50) and a standard deviation a of calculated magnitude values LOG(V); calculating a knock determination level V(KD) that is a value obtained by adding the product of standard deviation a and a coefficient U(3) to median value V(50); and when knock determination level V(KD) is greater than the product of determination value V(KX) and a coefficient K, decreasing determination value V(KX). When a knock magnitude N calculated using magnitude V is greater than determination value V(KX), ignition timing is retarded.
    Type: Application
    Filed: February 26, 2007
    Publication date: September 20, 2007
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
  • Patent number: 7222607
    Abstract: A knock detection system for a spark-ignition engine includes a knock sensor that is responsive to vibration of the engine and that generates a knock signal. A first module calculates a knock energy based on the knock signal and a second module calculates a knock intensity based on the knock energy. A third module regulates a spark timing of the engine based on the knock intensity.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: May 29, 2007
    Assignee: GM Global Technology Operations, Inc.
    Inventor: Claudio A. Hernandez
  • Patent number: 6947829
    Abstract: An apparatus is provided for detecting an occurrence of knocking of an engine from a signal sensed by a knocking sensor for the engine. The apparatus comprises plural filters extracting, from the signal, plural signal components whose frequency bands mutually differ and a unit determining whether or not there is the occurrence of knocking, based on results outputted from the plural filters. The plural filters include first and second types of filters. The first type of filter has a pass band set to a specific frequency band including a specific frequency of the signal. This specific frequency indicates the occurrence of knocking. The second type of filter has a pass band set to another specific frequency band. An inclination of a filtering characteristic of the second type of filter at a cut-off frequency thereof is steeper than that the first type of filter.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: September 20, 2005
    Assignee: Denso Corporation
    Inventor: Takayoshi Honda
  • Patent number: 6748922
    Abstract: A knock control apparatus normalizes a knock frequency magnitude and a background noise level to substantially the same levels in all the engine operating conditions in consideration of a variation in an ionic current level due to an environment, the number of revolutions per minute of the engine, an engine load, etc.
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: June 15, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshio Uchida, Kimihiko Tanaya
  • Patent number: 6736109
    Abstract: A knock control system is configured to precisely determine situations in which the knock signal cannot be detected and to suppress the occurrence of reductions in fuel efficiency, exhaust performance, and output performance. The knock control system has a knock sensor that detects an engine knocking condition to produce a knock signal of a prescribed level and a variable valve mechanism that can change the intake valve closing timing. Based on the ratio of the estimated knock signal during knocking to the estimated noise signal during no knocking, the knock control system determines if an accurate knock signal can be detected. The knock control system also determines if the valve seating position corresponding to the intake valve closing timing is within the knock detection interval and, if so, the estimated mechanical noise component of the estimated noise signal is updated.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: May 18, 2004
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Masato Hoshino
  • Publication number: 20040074476
    Abstract: A knock control apparatus normalizes a knock frequency magnitude and a background noise level to substantially the same levels in all the engine operating conditions in consideration of a variation in an ionic current level due to an environment, the number of revolutions per minute of the engine, an engine load, etc.
    Type: Application
    Filed: April 18, 2003
    Publication date: April 22, 2004
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Toshio Uchida, Kimihiko Tanaya