Patents by Inventor Mitsunori Wasada
Mitsunori Wasada 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: 11655770Abstract: An engine is provided, which includes an engine body including a cylinder provided with intake and exhaust ports and intake and exhaust valves, intake and exhaust passages, a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage, and a variable phase mechanism configured to change open/close timings of the intake valve while maintaining an open period of the intake valve at a 270° C.A or larger. A geometric compression ratio of the cylinder is 11:1 or higher. In a high-load range, the variable phase mechanism sets the intake valve close timing to be after an intake BDC and to make a ratio of a retarded amount of the intake closing to the geometric compression ratio be 4.58 or above and 6.67 or below, and sets the intake valve open timing to be before a close timing of the exhaust valve.Type: GrantFiled: January 31, 2022Date of Patent: May 23, 2023Assignee: Mazda Motor CorporationInventors: Naohiro Yamaguchi, Mitsunori Wasada, Satoshi Imamura, Toshimasa Kotani
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Patent number: 11635041Abstract: An engine is provided, which includes an engine body including a plurality of cylinders, each of the cylinders being provided with an intake port, an exhaust port, an intake valve, and an exhaust valve, an intake passage and an exhaust passage connected to the engine body, and a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage. A geometric compression ratio of the cylinder is 11:1 or higher. An open period of the intake valve is a range of 270° or larger by a crank angle. The exhaust passage includes a plurality of independent exhaust passages, each communicating with the exhaust port of one cylinder or with the exhaust ports of two or more cylinders of which timings of exhaust strokes are discontinuous from each other, and connecting the engine body to the turbine.Type: GrantFiled: January 31, 2022Date of Patent: April 25, 2023Assignee: Mazda Motor CorporationInventors: Naohiro Yamaguchi, Mitsunori Wasada, Satoshi Imamura, Toshimasa Kotani
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Publication number: 20220282674Abstract: An engine is provided, which includes an engine body including a cylinder provided with intake and exhaust ports and intake and exhaust valves, intake and exhaust passages, a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage, and a variable phase mechanism configured to change open/close timings of the intake valve while maintaining an open period of the intake valve at a 270° C.A or larger. A geometric compression ratio of the cylinder is 11:1 or higher. In a high-load range, the variable phase mechanism sets the intake valve close timing to be after an intake BDC and to make a ratio of a retarded amount of the intake closing to the geometric compression ratio be 4.58 or above and 6.67 or below, and sets the intake valve open timing to be before a close timing of the exhaust valve.Type: ApplicationFiled: January 31, 2022Publication date: September 8, 2022Inventors: Naohiro Yamaguchi, Mitsunori Wasada, Satoshi Imamura, Toshimasa Kotani
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Publication number: 20220282686Abstract: An engine is provided, which includes an engine body including a plurality of cylinders, each of the cylinders being provided with an intake port, an exhaust port, an intake valve, and an exhaust valve, an intake passage and an exhaust passage connected to the engine body, and a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage. A geometric compression ratio of the cylinder is 11:1 or higher. An open period of the intake valve is a range of 270° or larger by a crank angle. The exhaust passage includes a plurality of independent exhaust passages, each communicating with the exhaust port of one cylinder or with the exhaust ports of two or more cylinders of which timings of exhaust strokes are discontinuous from each other, and connecting the engine body to the turbine.Type: ApplicationFiled: January 31, 2022Publication date: September 8, 2022Inventors: Naohiro Yamaguchi, Mitsunori Wasada, Satoshi Imamura, Toshimasa Kotani
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Patent number: 11378041Abstract: An exhaust gas recirculation (EGR) passage is connected with an intake passage (a bypass passage bypassing a supercharger) of an engine. The EGR passage includes, in a position close to a connection port to the intake passage, an expanding portion in which a passage cross-sectional area expands and which lowers a flow speed of EGR gas so as to reduce an uneven flow, in the connection port, of the EGR gas flowing into the intake passage.Type: GrantFiled: June 27, 2019Date of Patent: July 5, 2022Assignee: Mazda Motor CorporationInventors: Jiro Kato, Taketoshi Yamauchi, Mitsunori Wasada, Ken Yoshida, Kenji Takami, Ryo Yamamoto, Haruna Yanagida, Masayoshi Higashio, Kensuke Ashikaga
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Publication number: 20210262420Abstract: An exhaust gas recirculation (EGR) passage is connected with an intake passage (a bypass passage bypassing a supercharger) of an engine. The EGR passage includes, in a position close to a connection port to the intake passage, an expanding portion in which a passage cross-sectional area expands and which lowers a flow speed of EGR gas so as to reduce an uneven flow, in the connection port, of the EGR gas flowing into the intake passage.Type: ApplicationFiled: June 27, 2019Publication date: August 26, 2021Inventors: Jiro KATO, Taketoshi YAMAUCHI, Mitsunori WASADA, Ken YOSHIDA, Kenji TAKAMI, Ryo YAMAMOTO, Haruna YANAGIDA, Masayoshi HIGASHIO, Kensuke ASHIKAGA
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Patent number: 10900411Abstract: The present disclosure aims to improve circulation of intake air and distribution of bypass intake air to cylinders, while reducing an increase in the overall height of an engine. A supercharger extends along a cylinder bank at a side of a surge tank extending along the cylinder bank. A bypass pipe branching off from an upstream intake pipe configured to introduce the intake air into the supercharger extends along the cylinder bank above the supercharger. A downstream side intake pipe configured to guide the intake air from the supercharger to the surge tank extends downward from the supercharger. The downstream intake pipe is, in a U-shape as viewed along the cylinder bank, connected to the surge tank.Type: GrantFiled: August 25, 2017Date of Patent: January 26, 2021Assignee: Mazda Motor CorporationInventors: Ken Yoshida, Ryotaro Nishida, Hidesaku Ebesu, Mitsunori Wasada, Mitsutaka Yamaya, Hisayuki Yamane, Yoshihiro Hamazume, Shuhei Tsujita, Hirofumi Shinohara, Eiji Takano, Tatsuya Koga, Tsukasa Hoshino, Masafumi Nakano, Kouichi Shimizu, Jiro Kato, Taketoshi Yamauchi
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Publication number: 20200370467Abstract: The present disclosure aims to improve circulation of intake air and distribution of bypass intake air to cylinders, while reducing an increase in the overall height of an engine. A supercharger extends along a cylinder bank at a side of a surge tank extending along the cylinder bank. A bypass pipe branching off from an upstream intake pipe configured to introduce the intake air into the supercharger extends along the cylinder bank above the supercharger. A downstream side intake pipe configured to guide the intake air from the supercharger to the surge tank extends downward from the supercharger. The downstream intake pipe is, in a U-shape as viewed along the cylinder bank, connected to the surge tank.Type: ApplicationFiled: August 25, 2017Publication date: November 26, 2020Inventors: Ken Yoshida, Ryotaro Nishida, Hidesaku Ebesu, Mitsunori Wasada, Mitsutaka Yamaya, Hisayuki Yamane, Yoshihiro Hamazume, Shuhei Tsujita, Hirofumi Shinohara, Eiji Takano, Tatsuya Koga, Tsukasa Hoshino, Masafumi Nakano, Kouichi Shimizu, Jiro Kato, Taketoshi Yamauchi
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Patent number: 10788001Abstract: The present disclosure aims to stabilize, in an engine with a supercharger, a detection result of an intake air temperature sensor interposed between the supercharger and an intercooler. A gas outlet of a supercharger and a gas inlet of an intercooler are connected together via a second passage. The second passage includes, in its middle position, a narrow region with a smaller cross-sectional area than the part of the second passage extending from an upstream end of the second passage to the middle position. The narrow region is provided with the intake air temperature sensor configured to detect the gas temperature in the narrow region.Type: GrantFiled: May 22, 2018Date of Patent: September 29, 2020Assignee: Mazda Motor CorporationInventors: Jiro Kato, Mitsunori Wasada, Hidesaku Ebesu, Toshihiko Hirata, Tatsuya Koga, Shuhei Tsujita
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Publication number: 20200095923Abstract: An intake and exhaust device (1) for a vehicle engine is capable to perform a compression self-ignition operation, the device comprising on an intake passage a supercharger (9) driven by a force other than an exhaust gas, wherein an exhaust purification device (18) disposed on an exhaust passage is disposed adjacent to an outer surface of the engine (2).Type: ApplicationFiled: July 27, 2017Publication date: March 26, 2020Applicant: MAZDA MOTOR CORPORATIONInventors: Hirokazu HASEGAWA, Keishi KITABATAKE, Taku KURAMASHI, Ryotaro NISHIDA, Mitsunori WASADA, Takeshi NAKAHIRA, Yuji KOJIMA, Amane TSUDA
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Publication number: 20200049110Abstract: Intake ports include a second port configured such that a flow rate of flowing gas is adjusted via a swirl control valve. When a surge tank is viewed in a cylinder axis direction, first and second branched passages are connected with a space being interposed therebetween in a cylinder array direction, and are connected to the surge tank on extension lines, each of which extends from an upstream end portion of an independent passage connected to the second port to an opposite side of each cylinder.Type: ApplicationFiled: February 20, 2018Publication date: February 13, 2020Inventors: Jiro Kato, Mitsunori Wasada, Masayoshi Higashio, Kensuke Ashikaga, Kazuhiro Nakamura, Yuji Kojima, Hidesaku Ebesu, Tatsuya Koga, Toshihiko Hirata
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Publication number: 20180340496Abstract: The present disclosure aims to stabilize, in an engine with a supercharger, a detection result of an intake air temperature sensor interposed between the supercharger and an intercooler. A gas outlet of a supercharger and a gas inlet of an intercooler are connected together via a second passage. The second passage includes, in its middle position, a narrow region with a smaller cross-sectional area than the part of the second passage extending from an upstream end of the second passage to the middle position. The narrow region is provided with the intake air temperature sensor configured to detect the gas temperature in the narrow region.Type: ApplicationFiled: May 22, 2018Publication date: November 29, 2018Inventors: Jiro Kato, Mitsunori Wasada, Hidesaku Ebesu, Toshihiko Hirata, Tatsuya Koga, Shuhei Tsujita
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Patent number: 10012134Abstract: Injection of the fuel by the injector 43 creates a gas flow in the combustion chamber. The gas expands in a radial fashion from an axis of a cylinder toward a radial outside of the cylinder, and then flows from the radial outside along the cylinder head bottom face 221 toward the axis of the cylinder. The spark plug 41 has a gap positioned away from the axis of the cylinder toward the radial outside of the cylinder at a predetermined distance, and placed radially inwardly from a position opposite a rim of an opening of the cavity 242. A side electrode extends to be oriented in a direction perpendicular to the flow of the gas along the cylinder head bottom face. The gap has a center positioned near the cylinder head bottom face, and closer to an interior of a combustion chamber than to the cylinder head bottom face.Type: GrantFiled: November 28, 2016Date of Patent: July 3, 2018Assignee: MAZDA MOTOR CORPORATIONInventors: Mitsunori Wasada, Tsuyoshi Yamamoto, Yasushi Nakahara, Takashi Youso, Hiroaki Abe, Takaaki Nagano, Atsushi Inoue, Kazuhiro Nagatsu, Takashi Kaminaga, Tatsuya Fujikawa
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Patent number: 9874169Abstract: A control device of a compression-ignition engine is provided. The device includes an engine having a cylinder, a fuel injection valve for injecting a fuel, an exhaust valve mechanism for switching an operation mode of an exhaust valve between a normal mode and an open-twice mode, a throttle valve disposed on an intake passage, and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder at least within a low engine load range. The controller suspends the fuel injection by the fuel injection valve when a predetermined fuel cut condition is met while the engine decelerates, and the controller fully closes the throttle valve and controls the exhaust valve mechanism to operate in the open-twice mode during the fuel cut. When a predetermined fuel resuming condition is met, the controller restarts the fuel injection, opens the throttle valve, and causes the compression-ignition combustion.Type: GrantFiled: August 20, 2014Date of Patent: January 23, 2018Assignee: Mazda Motor CorporationInventors: Kazuhiro Nagatsu, Junichi Taga, Atsushi Inoue, Takashi Youso, Mitsunori Wasada, Keiji Araki
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Publication number: 20170167360Abstract: Injection of the fuel by the injector 43 creates a gas flow in the combustion chamber. The gas expands in a radial fashion from an axis of a cylinder toward a radial outside of the cylinder, and then flows from the radial outside along the cylinder head bottom face 221 toward the axis of the cylinder. The spark plug 41 has a gap positioned away from the axis of the cylinder toward the radial outside of the cylinder at a predetermined distance, and placed radially inwardly from a position opposite a rim of an opening of the cavity 242. A side electrode extends to be oriented in a direction perpendicular to the flow of the gas along the cylinder head bottom face. The gap has a center positioned near the cylinder head bottom face, and closer to an interior of a combustion chamber than to the cylinder head bottom face.Type: ApplicationFiled: November 28, 2016Publication date: June 15, 2017Applicant: MAZDA MOTOR CORPORATIONInventors: Mitsunori WASADA, Tsuyoshi YAMAMOTO, Yasushi NAKAHARA, Takashi YOUSO, Hiroaki ABE, Takaaki NAGANO, Atsushi INOUE, Kazuhiro NAGATSU, Takashi KAMINAGA, Tatsuya FUJIKAWA
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Patent number: 9546613Abstract: A control device of a compression-ignition engine is provided. The control device includes the engine having a cylinder, an exhaust gas recirculation system for introducing exhaust gas into the cylinder, and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder within a predetermined compression-ignitable range on a low engine load side. Within the compression-ignitable range, the controller sets an EGR ratio higher as the engine load becomes lower, and the controller sets the EGR ratio to a predetermined highest EGR ratio when the engine load is at a specific load that is on the low engine load side within the compression-ignitable range. When the engine load is lower than the specific load, the controller sets the EGR ratio to be lower than the highest EGR ratio.Type: GrantFiled: August 20, 2014Date of Patent: January 17, 2017Assignee: Mazda Motor CorporationInventors: Kazuhiro Nagatsu, Junichi Taga, Takashi Youso, Atsushi Inoue, Mitsunori Wasada, Keiji Araki
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Patent number: 9267421Abstract: The axial line of an intake valve is inclined, and a gap between a piston crown surface and a valve head of the intake valve expands in accordance with the approach of the crankshaft axis. A relationship of G2>G1 is fulfilled, where G1 stands for a minimum gap between the lower surface of the cylinder head that is positioned between the intake valve and the exhaust valve facing the intake valve, with the crankshaft axis being interposed therebetween, and the piston crown surface in a top dead center, and G2 stands for a gap at a position that is the closest to the crankshaft axis, from among the gaps between the lower surface of the valve head of the intake valve and the piston crown surface at a center timing of a valve overlap period in which the intake valve and the exhaust valve are both open.Type: GrantFiled: August 12, 2013Date of Patent: February 23, 2016Assignee: Mazda Motor CorporationInventors: Tadatomo Toda, Mitsunori Wasada, Tadasu Hashiguchi, Takashi Youso, Kazuhiro Nagatsu
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Publication number: 20150167536Abstract: The axial line of an intake valve is inclined, and a gap between a piston crown surface and a valve head of the intake valve expands in accordance with the approach of the crankshaft axis. A relationship of G2>G1 is fulfilled, where G1 stands for a minimum gap between the lower surface of the cylinder head that is positioned between the intake valve and the exhaust valve facing the intake valve, with the crankshaft axis being interposed therebetween, and the piston crown surface in a top dead center, and G2 stands for a gap at a position that is the closest to the crankshaft axis, from among the gaps between the lower surface of the valve head of the intake valve and the piston crown surface at a center timing of a valve overlap period in which the intake valve and the exhaust valve are both open.Type: ApplicationFiled: August 12, 2013Publication date: June 18, 2015Applicant: MAZDA MOTOR CORPORATIONInventors: Tadatomo Toda, Mitsunori Wasada, Tadasu Hashiguchi, Takashi Youso, Kazuhiro Nagatsu
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Publication number: 20150083073Abstract: A control device of a compression-ignition engine is provided. The device includes an engine having a cylinder, a fuel injection valve for injecting a fuel, an exhaust valve mechanism for switching an operation mode of an exhaust valve between a normal mode and an open-twice mode, a throttle valve disposed on an intake passage, and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder at least within a low engine load range. The controller suspends the fuel injection by the fuel injection valve when a predetermined fuel cut condition is met while the engine decelerates, and the controller fully closes the throttle valve and controls the exhaust valve mechanism to operate in the open-twice mode during the fuel cut. When a predetermined fuel resuming condition is met, the controller restarts the fuel injection, opens the throttle valve, and causes the compression-ignition combustion.Type: ApplicationFiled: August 20, 2014Publication date: March 26, 2015Inventors: Kazuhiro Nagatsu, Junichi Taga, Atsushi Inoue, Takashi Youso, Mitsunori Wasada, Keiji Araki
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Publication number: 20150083072Abstract: A control device of a compression-ignition engine is provided. The control device includes the engine having a cylinder, an exhaust gas recirculation system for introducing exhaust gas into the cylinder, and a controller for operating the engine by compression-ignition combustion of mixture gas inside the cylinder within a predetermined compression-ignitable range on a low engine load side. Within the compression-ignitable range, the controller sets an EGR ratio higher as the engine load becomes lower, and the controller sets the EGR ratio to a predetermined highest EGR ratio when the engine load is at a specific load that is on the low engine load side within the compression-ignitable range. When the engine load is lower than the specific load, the controller sets the EGR ratio to be lower than the highest EGR ratio.Type: ApplicationFiled: August 20, 2014Publication date: March 26, 2015Inventors: Kazuhiro Nagatsu, Junichi Taga, Takashi Youso, Atsushi Inoue, Mitsunori Wasada, Keiji Araki