Patents by Inventor Shuhei Oe
Shuhei Oe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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METHOD AND DEVICE FOR CONTROL IGNITION TIMING THROUGH KNOCK CONTROL IN AN INTERNAL COMBUSTION ENGINE
Publication number: 20090043484Abstract: 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: ApplicationFiled: January 24, 2007Publication date: February 12, 2009Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INCInventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Koji Aso, Kenji Senda, Yuichi Takemura, Shuhei Oe -
Publication number: 20090038384Abstract: Out of synthesized waveforms of vibrations in a first frequency band A to a third frequency band C, a knock magnitude N is calculated by using a portion ? having an integrated value greater than a reference magnitude in a knock region but not using a portion having an integrated value greater than the reference magnitude out of the knock region (i.e., a region obtained by excluding the knock region from a knock detecting gate). In a case where knock magnitude N is greater than a determination value V(KX), it is determined that knocking occurs. In contrast, in a case where knock magnitude N is not greater than determination value V(KX), it is determined that no knocking occurs.Type: ApplicationFiled: May 21, 2007Publication date: February 12, 2009Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Patent number: 7478622Abstract: 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: GrantFiled: June 25, 2007Date of Patent: January 20, 2009Assignees: Toyota Jidosha Kabushiki Kaisha, Denso CorporationInventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20090005956Abstract: 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: ApplicationFiled: May 28, 2007Publication date: January 1, 2009Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN INC.Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20080306677Abstract: 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: ApplicationFiled: August 14, 2008Publication date: December 11, 2008Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Kiyoshi IWADE, Nobuyuki Murate, Shuhei Oe, Rihito Kaneko, Kenji Kasashima, Yuichi Takemura
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Publication number: 20080294328Abstract: An engine ECU executes a program including: the step (S222) of increasing a determination value V(J) by a correction amount A(3) if the number of knock intensities N not lower than the determination value V(J) is not smaller than a threshold value B(1) (YES at S220) among knock intensities N of a plurality of predetermined number of continuous ignition cycles; and the step (S232) of increasing the determination value V(J) by a correction amount A(5) if the number of knock intensities N not smaller than the determination value V(J) is not smaller than a threshold value B(3) (YES at S230), among knock intensities N of a plurality of ignition cycles satisfying the condition that a coefficient of correlation K calculated by comparing a vibration waveform and a knock waveform model is not smaller than a threshold value K(1), of the knock intensities of a plurality of predetermined continuous ignition cycles.Type: ApplicationFiled: October 1, 2007Publication date: November 27, 2008Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Norihito Hanai, Yasuhiro Yamasako, Shuhei Oe, Yuichi Takemura
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Publication number: 20080264150Abstract: An engine ECU executes a program including the steps of: detecting a vibration corresponding to a first radial resonance mode by using a band-pass filter, from vibrations sensed by an in-cylinder pressure sensor provided at an upper central portion of the cylinder; calculating knock intensity N based on a result of comparison between the detected waveform and a knock waveform model prepared in advance as a vibration waveform when knocking occurs; determining that knocking occurred when the knock intensity N is larger than a predetermined reference value; and determining that knocking has not occurred when the knock intensity N is not larger than the predetermined reference value.Type: ApplicationFiled: June 27, 2008Publication date: October 30, 2008Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Shuhei Oe, Kiyoshi Iwade, Nobuyuki Murate, Rihito Kaneko, Yuichi Takemura, Shigeru Kamio
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Patent number: 7441543Abstract: 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: GrantFiled: June 13, 2007Date of Patent: October 28, 2008Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20080262705Abstract: An engine ECU executes: calculating 15-degrees integrated value integrating vibration intensity for each of six crank angle ranges; detecting an amount of change in the 15-degrees integrated value between ignition cycles; specifying two ranges having larger amounts of change; specifying a crank angle having intensity larger than that of a neighboring crank angle in a search range determined to be the same as the specified ranges; calculating a coefficient of correlation K corresponding to a difference between a vibration waveform and a knock waveform model while the specified crank angle is matched with a timing at which intensity peaks in the knock waveform model; and, if the coefficient of correlation K is larger than a threshold value K(0), determining that knock has occurred.Type: ApplicationFiled: October 1, 2007Publication date: October 23, 2008Applicants: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken Inc.Inventors: Shuhei Oe, Kouzi Ohara, Satoshi Masuda, Yuuichi Takemura, Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Norihito Hanai, Yasuhiro Yamasako
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Patent number: 7424820Abstract: 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: GrantFiled: June 27, 2006Date of Patent: September 16, 2008Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.Inventors: Kiyoshi Iwade, Nobuyuki Murate, Shuhei Oe, Rihito Kaneko, Kenji Kasashima, Yuichi Takemura
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Patent number: 7412874Abstract: An engine ECU executes a program including the steps of: detecting a vibration corresponding to a first radial resonance mode by using a band-pass filter, from vibrations sensed by an in-cylinder pressure sensor provided at an upper central portion of the cylinder; calculating knock intensity N based on a result of comparison between the detected waveform and a knock waveform model prepared in advance as a vibration waveform when knocking occurs; determining that knocking occurred when the knock intensity N is larger than a predetermined reference value; and determining that knocking has not occurred when the knock intensity N is not larger than the predetermined reference value.Type: GrantFiled: April 26, 2006Date of Patent: August 19, 2008Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Nippon Soken, Inc.Inventors: Shuhei Oe, Kiyoshi Iwade, Nobuyuki Murate, Rihito Kaneko, Yuichi Takemura, Shigeru Kamio
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Patent number: 7392788Abstract: 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: GrantFiled: February 26, 2007Date of Patent: July 1, 2008Assignees: Toyota Jidosha Kabushiki Kaisha, Denso CorporationInventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
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Patent number: 7363142Abstract: 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: GrantFiled: February 26, 2007Date of Patent: April 22, 2008Assignees: Toyota Jidosha Kabushiki Kaisha, Denso CorporationInventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
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Publication number: 20080091335Abstract: A band pass filter processing extracts the vibration component (frequency component) of the 1st to the 4th order frequency band from the output of the knock sensor. A primary frequency band is established as the frequency band containing the fundamental frequency (primary resonance frequency) which is the lowest frequency of the knocking vibration frequencies. The 2nd to the 4th order frequency band is established as the frequency band containing the 2nd to the 4th order resonance frequency. Based on the vibration strength of the primary frequency component, the comparison result between the composite vibration waveform which compounded the 1st to the 4th order frequency component and the ideal knock waveform, and the vibration strength of the summation of the 1st to the 4th order frequency component, the noise and knocking are distinguished from each other with sufficient accuracy.Type: ApplicationFiled: October 11, 2007Publication date: April 17, 2008Applicants: DENSO CORPORATION, NIPPON SOKEN, INC., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuuichi Takemura, Shuhei Oe, Rihito Kaneko, Kenji Kasashima
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Publication number: 20080000449Abstract: 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: ApplicationFiled: June 25, 2007Publication date: January 3, 2008Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Rihito KANEKO, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20080000448Abstract: 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: ApplicationFiled: June 25, 2007Publication date: January 3, 2008Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Rihito KANEKO, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20070289575Abstract: 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: ApplicationFiled: June 13, 2007Publication date: December 20, 2007Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Masatomo Yoshihara, Kenji Kasashima, Rihito Kaneko, Kenji Senda, Yuuichi Takemura, Shuhei Oe
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Publication number: 20070215109Abstract: 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: ApplicationFiled: February 26, 2007Publication date: September 20, 2007Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Rihito KANEKO, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
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Publication number: 20070214869Abstract: An engine ECU executes a program including a step of, when it has temporarily been determined that knocking had occurred because of the presence of an integrated value greater than a product of the reference magnitude and coefficient Y among the integrated values of vibration in fourth frequency band D that includes first to third frequency bands A to C, calculating knock magnitude N using the integrated values in the synthesized waveform of first to third frequency bands A to C and correlation coefficient K calculated from a vibration waveform of fourth frequency band D. Based on a comparison between knock magnitude N and determination value V(KX), whether or not knocking has occurred is determined. If there is no integrated value greater than a product of the reference magnitude and coefficient Y, it is determined that knocking has not occurred.Type: ApplicationFiled: March 12, 2007Publication date: September 20, 2007Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe
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Publication number: 20070215108Abstract: 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: ApplicationFiled: February 26, 2007Publication date: September 20, 2007Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Rihito Kaneko, Kenji Kasashima, Masatomo Yoshihara, Kenji Senda, Yuichi Takemura, Shuhei Oe