Patents by Inventor Youichi Iihoshi
Youichi Iihoshi 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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Patent number: 7441554Abstract: The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback control in accordance with the diagnosis result. The controller includes a unit for computing frequency response characteristics in a range from an A/F ratio adjusting unit to the A/F ratio sensor, and it diagnoses the A/F ratio sensor based on a gain characteristic and a response characteristic given by the computed frequency response characteristics. In accordance with the diagnosis result, parameters (P- and I-component gains) used in A/F ratio feedback control (PI control) are optimized.Type: GrantFiled: April 23, 2007Date of Patent: October 28, 2008Assignee: Hitachi, Ltd.Inventors: Shinji Nakagawa, Youichi Iihoshi, Yoshikuni Kurashima, Toshio Hori
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Publication number: 20070186914Abstract: The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback control in accordance with the diagnosis result. The controller includes a unit for computing frequency response characteristics in a range from an A/F ratio adjusting unit to the A/F ratio sensor, and it diagnoses the A/F ratio sensor based on a gain characteristic and a response characteristic given by the computed frequency response characteristics. In accordance with the diagnosis result, parameters (P- and I-component gains) used in A/F ratio feedback control (PI control) are optimized.Type: ApplicationFiled: April 23, 2007Publication date: August 16, 2007Applicant: HITACHI, LTD.Inventors: Shinji NAKAGAWA, Youichi IIHOSHI, Yoshikuni KURASHIMA, Toshio HORI
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Patent number: 7225800Abstract: The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback control in accordance with the diagnosis result. The controller includes a unit for computing frequency response characteristics in a range from an A/F ratio adjusting unit to the A/F ratio sensor, and it diagnoses the A/F ratio sensor based on a gain characteristic and a response characteristic given by the computed frequency response characteristics. In accordance with the diagnosis result, parameters (P- and I-component gains) used in A/F ratio feedback control (PI control) are optimized.Type: GrantFiled: December 23, 2004Date of Patent: June 5, 2007Assignee: Hitachi, Ltd.Inventors: Shinji Nakagawa, Youichi Iihoshi, Yoshikuni Kurashima, Toshio Hori
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Patent number: 7128048Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: GrantFiled: March 19, 2003Date of Patent: October 31, 2006Assignee: Hitachi, Ltd.Inventors: Shiro Yamoaka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi
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Patent number: 7055492Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: GrantFiled: April 22, 2004Date of Patent: June 6, 2006Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi
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Patent number: 6976936Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: GrantFiled: April 22, 2004Date of Patent: December 20, 2005Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi
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Publication number: 20050161032Abstract: The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback control in accordance with the diagnosis result. The controller includes a unit for computing frequency response characteristics in a range from an A/F ratio adjusting unit to the A/F ratio sensor, and it diagnoses the A/F ratio sensor based on a gain characteristic and a response characteristic given by the computed frequency response characteristics. In accordance with the diagnosis result, parameters (P- and I-component gains) used in A/F ratio feedback control (PI control) are optimized.Type: ApplicationFiled: December 23, 2004Publication date: July 28, 2005Applicant: Hitachi, Ltd.Inventors: Shinji Nakagawa, Youichi Iihoshi, Yoshikuni Kurashima, Toshio Hori
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Publication number: 20040194754Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: ApplicationFiled: April 22, 2004Publication date: October 7, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi
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Publication number: 20040194759Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: ApplicationFiled: April 22, 2004Publication date: October 7, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi
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Publication number: 20040050363Abstract: In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.Type: ApplicationFiled: March 19, 2003Publication date: March 18, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Toshiharu Nogi, Atsushi Shimada, Nobuyasu Kanekawa, Youichi Iihoshi