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公开(公告)号：US11118531B2
公开(公告)日：2021-09-14
申请号：US16692377
申请日：2019-11-22
发明人： Takeru Matsuo , Yoshie Kakuda , Sangkyu Kim , Daisuke Shimo
摘要： An engine control device is provided. A fuel injection valve performs a pre-injection and a main injection on a retarding side of the pre-injection so that pressure waves resulting from combustions caused by the injections cancel each other out. The control device secures a fuel injection amount to be supplied to a combustion chamber in one cycle by at least the pre-injection, the main injection, and a middle injection. The control device causes the fuel injection valve to perform the pre-injection at a timing when a piston is located at an advancing side of compression top dead center for premix combustion, to start the main injection during a combustion period of the fuel injected by the pre-injection for diffuse combustion, and to perform the middle injection at a timing between the other two injections with a fuel injection amount less than the other injections.
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公开(公告)号：US11092107B2
公开(公告)日：2021-08-17
申请号：US16641758
申请日：2018-08-23
发明人： Sangkyu Kim , Takashi Sumimoto , Daisuke Shimo , Tomonori Harada , Shintaro Okada , Shuji Takuma
摘要： An engine combustion chamber structure includes a combustion chamber of an engine and a fuel injection valve. The fuel injection valve injects fuel toward a cavity in a crown face of a piston. The cavity includes a first cavity provided in a radially central region of the crown face with a first bottom having a first depth, a second cavity provided in an outer side of the first cavity with a second bottom having a second depth being smaller than the first depth, a connecting portion, and a standing wall region disposed further in a radially outer side than the second bottom of the second cavity. The second bottom is provided lower than an upper end, of the connecting portion. A lower section of the standing wall region is provided further in a radially inner side than an upper edge of the standing wall region.
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公开(公告)号：US20200063644A1
公开(公告)日：2020-02-27
申请号：US16461328
申请日：2016-11-22
发明人： Jun Kanzaki , Motoshi Kataoka , Sangkyu Kim , Shinya Iida , Shintaro Okada , Tomonori Harada , Shun Namba
摘要： In a diesel engine, a crown surface of a piston is formed with a cavity which is recessed toward an opposite side of a cylinder head, and which has a circular shape in planar view, and a wall surface forming the cavity includes a lip which is formed on a peripheral edge of the cavity, and which is protruded radially inward, and the lip is formed with a plurality of notches which are recessed radially outward from the peripheral edge of the cavity, and a fuel injector is arranged at a center of the cylinder head, and formed with a plurality of injection holes oriented toward an inside of the cavity so as to radially spray fuel within the cavity, and each of the plurality of the notches is arranged between oriented directions of two adjacent injection holes.
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公开(公告)号：US20200011264A1
公开(公告)日：2020-01-09
申请号：US16453262
申请日：2019-06-26
发明人： Takeru Matsuo , Yoshie Kakuda , Kengo Nakashima , Sangkyu Kim , Daisuke Shimo , Shun Namba
摘要： The control device that controls fuel injection of a diesel engine includes a split injection control module that causes a fuel injection valve to execute pre-injection and post-injection, a setting module that sets a fuel injection amount or a fuel injection timing in the pre-injection so that a target heat release rate characteristic, by which a ratio between a first peak and a second peak, which are peaks of an increase rate of combustion pressure accompanying the pre- and post-injection, becomes a target value set in advance, can be obtained, a prediction module that predicts an occurrence time or a peak value of the first peak based on the injection amount or injection timing and a parameter related to a combustion environmental factor, and a correction module that corrects the fuel injection amount or the fuel injection timing set by the setting module.
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公开(公告)号：US20180340488A1
公开(公告)日：2018-11-29
申请号：US15973060
申请日：2018-05-07
发明人： Daisuke Fukuda , Akira Taguchi , Hiroshi Minamoto , Naotoshi Shirahashi , Yudai Kato , Yoshie Kakuda , Yasuyuki Sagane , Sangkyu Kim , Daisuke Shimo , Kazunori Hirabayashi
摘要： A control system of an engine is provided, which includes a piston formed with a cavity and configured to reciprocate in a cylinder along a center axis of the cylinder, and a fuel injector disposed facing a top surface of the piston and configured to inject fuel along an injection axis. When the piston is located near a top dead center of compression stroke, the fuel injector performs a first injection so that the fuel flows from the fuel injector toward the cavity along the injection axis, collides with an inner surface of the cavity, then flows back toward the fuel injector along the inner surface of the cavity from a position offset from the injection axis. The fuel injector performs a second injection toward the cavity at a timing after the first injection and at which the fuel of the first injection flows back.
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公开(公告)号：US11035318B2
公开(公告)日：2021-06-15
申请号：US16711762
申请日：2019-12-12
发明人： Takeru Matsuo , Yoshie Kakuda , Sangkyu Kim , Daisuke Shimo
摘要： A control device for a compression ignition engine is provided, which causes an injector to perform a pre-injection and a main injection, sets fuel injection timings of these injections so that an interval between a first peak of a heat release rate resulting from the combustion of fuel injected by the pre-injection and a second peak of the heat release rate resulting from the combustion of fuel injected by the main injection becomes an interval to make pressure waves caused by these combustions cancel each other out, and when an increase of an intake air temperature is detected, controls the injector to reduce the injection amount of the pre-injection and retard the injection timing of the pre-injection compared with a case where the increase of the intake air temperature is not detected under a condition that engine load and speed are the same.
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公开(公告)号：US20210071615A1
公开(公告)日：2021-03-11
申请号：US17010124
申请日：2020-09-02
摘要： A diesel engine system has a piston in which a cavity is formed in a crown surface. The cavity has a bottom part, a peripheral part dented so as to be convex radially outward in a cross-sectional view, and a lip part formed above the peripheral part and protruding so as to be convex radially inward in the cross-sectional view. An injection controller causes an injector to perform, during operation in a given operating range, a main injection in which injected fuel is directed to the lip part, and an after-injection in which a smaller amount of fuel than the main injection is injected at a given period later than the main injection in an expansion stroke. An injection interval period that is a period of time from an end of the main injection to a start of the after-injection is shorter as an injection pressure of fuel increases.
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公开(公告)号：US20200080468A1
公开(公告)日：2020-03-12
申请号：US16461324
申请日：2016-11-22
发明人： Jun Kanzaki , Motoshi Kataoka , Sangkyu Kim , Shinya Iida , Shintaro Okada , Tomonori Harada , Shun Namba
摘要： A diesel engine comprises: a cylinder head covering one end of a cylinder; a piston having a crown surface opposed to the cylinder head, and performing a reciprocating movement within the cylinder; and a fuel injector attached to the cylinder head. The cylinder head is formed with an intake port so as to generate a swirl flow within the cylinder. The crown surface of the piston is formed with a cavity which is recessed toward an opposite side of the cylinder head and which has a circular shape in planar view, and a notch which is recessed radially outward from a peripheral edge of the cavity. The fuel injector is formed with an injection hole oriented toward an inside of the cavity.
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公开(公告)号：US10041395B2
公开(公告)日：2018-08-07
申请号：US14720609
申请日：2015-05-22
发明人： Daisuke Shimo , Sangkyu Kim , Makoto Namba , Masahiro Miyazaki , Yudai Kato , Shuji Takuma , Tadashi Tadokoro
摘要： A structure of a combustion chamber is provided. The structure includes a cavity formed in a central part of a crown surface of a piston and a wall surface constituting the cavity. The wall surface has a central ridge portion bulging farther toward a bottom surface of a cylinder head toward a center of the cavity, a periphery concave portion formed radially outward of the central ridge portion to concave radially outward, and a lip portion formed between the periphery concave portion and an opening edge of the cavity to convex radially inward. An outer circumferential part of the crown surface has a first portion and a second portion located radially outward of the first portion. A stepped portion is formed between the first and second portions. A stepped portion volume ratio of a stepped portion volume to a top dead center volume is set to 0.1 or smaller.
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公开(公告)号：US10982588B2
公开(公告)日：2021-04-20
申请号：US16740269
申请日：2020-01-10
发明人： Sangkyu Kim , Takashi Sumimoto , Shintaro Okada , Daisuke Shimo , Shuji Takuma
摘要： A cavity includes a lower-side cavity, an upper-side cavity, a first lip and a second lip. The upper-side cavity has a guide curved surface which extends along a circumference of a first imaginary circle in a section along a cylinder-axis direction, and the first lip has a curved surface which extends along a circumference of a second imaginary circle in a section along the cylinder-axis direction. An angle X which a cylinder axis makes with a common tangential line of the first imaginary circle and the second imaginary circle is set as 75°
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