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公开(公告)号：US11118528B2
公开(公告)日：2021-09-14
申请号：US16929853
申请日：2020-07-15
Applicant: Mazda Motor Corporation
Inventor： Takuya Ohura , Tomohiro Nishida , Michiharu Kawano , Yuya Honda , Tota Tanii
Abstract: A fuel injection control device for an engine is provided. A fuel injector with multiple nozzle holes forms a lean mixture gas inside a combustion chamber, a spark plug ignites to cause the mixture gas to start combustion accompanied by flame propagation, then combust by self-ignition. A first atomized fuel spray injected from a first nozzle hole and a second atomized fuel spray injected from a second nozzle hole separate from each other by a swirl flow, and a third atomized fuel spray injected from a third nozzle hole and a fourth atomized fuel spray from a fourth nozzle hole approach each other by the swirl flow so that a first area and a second area where mixture gas is richer are formed inside the combustion chamber. The fuel injector sequentially performs first, second, and third injections with an injection interval therebetween in an intake stroke.
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公开(公告)号：US10815872B2
公开(公告)日：2020-10-27
申请号：US16478881
申请日：2017-03-03
Applicant: MAZDA MOTOR CORPORATION
Inventor： Yasushi Nakahara , Yohei Suzuki , Tsuyoshi Yamamoto , Michiharu Kawano , Yuya Honda , Kento Onishi
Abstract: In an engine (1), an ignition plug (22) is arranged between a first intake port (6) and a second intake port (7). In a case where a downstream end portion (71) of the second intake port (7) is divided into a first intake port (6) side and an opposite first intake port (6) side, an inner wall surface (71a) of an opposite first intake port (6) side portion extends in a direction toward the first intake port (6) as extending from an upstream side to a downstream side of the second intake port (7).
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公开(公告)号：US11041457B2
公开(公告)日：2021-06-22
申请号：US16618321
申请日：2018-05-31
Applicant: MAZDA MOTOR CORPORATION
Inventor： Satoshi Imamura , Masaki Fukuma , Yasushi Nakahara , Atsushi Inoue , Kota Matsumoto , Yoshiharu Ueki , Michiharu Kawano , Yuya Honda , Kento Onishi
Abstract: A structure of a combustion chamber for an engine includes: a crown surface of a piston; a combustion chamber ceiling surface formed on a cylinder head; and an ignition plug mounted on the combustion chamber ceiling surface, and including an ignition portion disposed in such a way as to face the combustion chamber. The crown surface of the piston includes a cavity which is recessed in a cylinder axis direction in a region including a position below the ignition portion of the ignition plug in a plan view from the cylinder axis direction. A rim portion of the cavity includes a guide portion, raised in the cylinder axis direction with respect to an inner region of the rim portion, interposing the ignition portion when the piston is at a compression top dead center, and configured to guide an air-fuel mixture within the combustion chamber to the ignition portion.
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公开(公告)号：US20210025348A1
公开(公告)日：2021-01-28
申请号：US16929873
申请日：2020-07-15
Applicant: Mazda Motor Corporation
Inventor： Takuya Ohura , Tomohiro Nishida , Michiharu Kawano , Yuya Honda , Tota Tanii
Abstract: A fuel injection control device for an engine is provided. A swirl generator generates a swirl flow inside a combustion chamber. A fuel injector with multiple nozzle holes injects fuel into the combustion chamber, and forms a lean mixture gas inside the combustion chamber. An spark plug ignites the lean mixture gas to cause the mixture gas to start combustion accompanied by flame propagation, and then combust by self-ignition. A first atomized fuel spray injected from a first nozzle hole and a second atomized fuel spray injected from a second nozzle hole separate from each other by the swirl flow. The fuel injector sequentially performs first and second injections in an intake stroke. A ratio of an injection amount of the second injection to the entire amount of fuel required per cycle is increased as an engine load increases.
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公开(公告)号：US10767551B2
公开(公告)日：2020-09-08
申请号：US16478880
申请日：2017-03-03
Applicant: MAZDA MOTOR CORPORATION
Inventor： Yasushi Nakahara , Yohei Suzuki , Tsuyoshi Yamamoto , Michiharu Kawano , Yuya Honda , Kento Onishi
Abstract: In an engine (1), when an intake valve (16) opens, a downstream end portion (61) of a first intake port (6) extends to direct to between a shade back (162a) positioned on a cylinder axis (C) side with respect to a valve stem (161) and a ceiling surface (51) facing the shade back (162a). As viewed in a section perpendicular to a direction perpendicular to an intake air flow direction, a second intake port side inner wall surface (61a) at the downstream end portion (61) of the first intake port (6) curves apart from a second intake port (7) in a direction from an exhaust side to an intake side as compared to the shape of an opposite second intake port side inner wall surface (61b) mirror-reversed to a second intake port (7) side.
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Patent Agency Ranking
公开(公告)号：US11149682B2
公开(公告)日：2021-10-19
申请号：US16618074
申请日：2018-05-22
Applicant: MAZDA MOTOR CORPORATION
Inventor： Satoshi Imamura , Masaki Fukuma , Yasushi Nakahara , Atsushi Inoue , Kota Matsumoto , Yoshiharu Ueki , Michiharu Kawano , Yuya Honda , Kento Onishi
Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side. An ignition portion of the ignition plug is disposed on the intake port side. The ignition plug is ignited at a timing after the piston passes a compression top dead center. The injector is disposed on the center portion, and is configured to inject fuel toward the exhaust port side. A cavity is provided on the crown surface. A reverse squish flow generation portion is provided in the combustion chamber.
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公开(公告)号：US11015515B2
公开(公告)日：2021-05-25
申请号：US16678305
申请日：2019-11-08
Applicant: Mazda Motor Corporation
Inventor： Satoshi Imamura , Masaki Fukuma , Yasushi Nakahara , Atsushi Inoue , Kota Matsumoto , Michiharu Kawano , Yuya Honda , Futa Nishi
Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape; a pair of first raised portions having a mound-shape along a pent roof shape; and a second raised portion provided to protrude at a position orthogonal to a ridge extending direction of the pair of first raised portions. With a height of the first raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a height of the second raised portion being represented as H2, H1/H2 as a ratio of the height H1 of the first raised portion to the height H2 of the second raised portion is set to be in a range of 1.92 or more and 2.75 or less.
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公开(公告)号：US20160356230A1
公开(公告)日：2016-12-08
申请号：US15170873
申请日：2016-06-01
Applicant: Mazda Motor Corporation
Inventor： Tomomi Watanabe , Kazunori Hirabayashi , Shigeyuki Hirashita , Michiharu Kawano
CPC classification number: F02D41/064 , F02B23/104 , F02B31/00 , F02B2023/106 , F02D37/02 , F02D41/024 , F02D41/06 , F02D41/3023 , F02D41/401 , F02D41/402 , F02P5/145 , F02P5/1502 , Y02T10/125 , Y02T10/146 , Y02T10/26 , Y02T10/44
Abstract: A control system of an engine is provided, which controls, by using a tumble flow, a behavior of fuel that is directly injected into a combustion chamber formed inside a cylinder of the engine. The control system includes a fuel injector for directly injecting the fuel into the combustion chamber, a tumble flow generator for generating the tumble flow within the combustion chamber, an ignition timing control module for controlling an ignition timing of an ignition plug of the engine, and a fuel injector control module for controlling the fuel injector to inject the fuel at an intake-stroke-early-half injection timing, an intake-stroke-latter-half injection timing, and a compression-stroke-early-half injection timing when the ignition timing is controlled by the ignition timing control module to be before a top dead center of the compression stroke in a cold state of the engine.
Abstract translation: 提供了一种发动机的控制系统，其通过使用翻转流来控制直接喷射到形成在发动机的气缸内的燃烧室中的燃料的行为。 控制系统包括用于将燃料直接喷射到燃烧室中的燃料喷射器，用于在燃烧室内产生翻滚流的转鼓流发生器，用于控制发动机火花塞的点火正时的点火正时控制模块，以及 燃料喷射器控制模块，用于控制燃料喷射器在进气冲程 - 早期半喷射正时喷射燃料，进气冲程 - 后半喷射正时和压缩冲程 - 早期半喷射正时，当 点火正时由点火正时控制模块控制在发动机冷态下处于压缩冲程的上止点之前。
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公开(公告)号：US20220260024A1
公开(公告)日：2022-08-18
申请号：US17457307
申请日：2021-12-02
Applicant: Mazda Motor Corporation
Inventor： Tomonori Urushihara , Masanari Sueoka , Yusuke Kawai , Atsushi Inoue , Masatoshi Hidaka , Kota Matsumoto , Tota Tanii , Michiharu Kawano , Toru Miyamoto , Tsubasa Ito
Abstract: An internal combustion engine is provided, which includes a variable phase mechanism configured to change rotational phases of intake and exhaust camshafts so that a valve overlap is made. An intake cam lobe is formed such that an open period of the intake valve is 210° or larger and 330° or smaller of a crank angle. The exhaust cam lobe is formed such that, during the overlap period with the rotational phase of the intake camshaft advanced to the maximum and the rotational phase of the exhaust camshaft retarded to the maximum, an effective valve lift amount (Lift(CA)) of the exhaust valve which is a function of a crank angle from the open timing (CAIVO) of the intake valve to a middle timing (CAcenter) of the overlap period, an inner circumferential length (L_ex) of a valve seat, and a swept volume (V) per cylinder satisfy the following formula: 0 . 0 1 5 ≤ L_ex V × ∫ C A IVO C A c e n t e r Lif t ( CA ) d C A .
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公开(公告)号：US11415066B1
公开(公告)日：2022-08-16
申请号：US17457307
申请日：2021-12-02
Applicant: Mazda Motor Corporation
Inventor： Tomonori Urushihara , Masanari Sueoka , Yusuke Kawai , Atsushi Inoue , Masatoshi Hidaka , Kota Matsumoto , Tota Tanii , Michiharu Kawano , Toru Miyamoto , Tsubasa Ito
Abstract: An internal combustion engine is provided, which includes a variable phase mechanism configured to change rotational phases of intake and exhaust camshafts so that a valve overlap is made. An intake cam lobe is formed such that an open period of the intake valve is 210° or larger and 330° or smaller of a crank angle. The exhaust cam lobe is formed such that, during the overlap period with the rotational phase of the intake camshaft advanced to the maximum and the rotational phase of the exhaust camshaft retarded to the maximum, an effective valve lift amount (Lift(CA)) of the exhaust valve which is a function of a crank angle from the open timing (CAIVO) of the intake valve to a middle timing (CAcenter) of the overlap period, an inner circumferential length (L_ex) of a valve seat, and a swept volume (V) per cylinder satisfy the following formula: 0 . 0 1 5 ≤ L _ ex V × ∫ C A IVO C A c e n t e r Lift ( CA ) d C A .
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