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1. 发明申请

US20100258078A1 DIRECT FUEL-INJECTION ENGINE 失效
标题翻译：直接燃油喷射发动机
公开(公告)号：US20100258078A1
公开(公告)日：2010-10-14
申请号：US12745814
申请日：2008-12-12
申请人： Kenichiro Ikeya , Nobuhiko Sasaki , Hiroshi Sono , Yukihisa Yamaya , Akihiro Yamaguchi , Yoshimasa Kaneko , Goichi Katayama , Yutaka Tajima
发明人： Kenichiro Ikeya , Nobuhiko Sasaki , Hiroshi Sono , Yukihisa Yamaya , Akihiro Yamaguchi , Yoshimasa Kaneko , Goichi Katayama , Yutaka Tajima
IPC分类号： F02B5/00
CPC分类号： F02B23/0669 , F02B3/06 , F02B23/0621 , F02B23/0651 , F02B23/0657 , F02B23/0696 , F02B2275/14 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel-injection engine equipped with a pentroof-shaped piston, cross-sectional shapes containing a piston central axis (Lp) of a cavity recessed in a central part of the piston having a top face with the height varying in the circumferential direction are set so as to be basically identical at each position in the circumferential direction (see broken line). Since the sizes of the cross-sectional shapes of the cavity thereby become different in a region further on the piston central axis (Lp) side than intersection points (e1, d1) in the vicinity of a fuel injection point (Oinj), in order to compensate for this, by correcting in a cross section that is away from the piston pin direction the cross-sectional shape of the broken line into the cross-sectional shape of a solid line so that it enlarges, the size of the cross-sectional shape at each position of the circumferential direction of the cavity is thereby made more uniform, thus making the conditions in which fuel and air are mixed uniform and improving the engine output and reducing harmful exhaust materials.
摘要翻译：在配备有五角柱形活塞的直接燃料喷射发动机中，包含在活塞的中心部分凹陷的空腔的活塞中心轴线（Lp）的横截面形状具有顶面，其高度在圆周方向上变化被设定为在圆周方向上的每个位置基本相同（参见虚线）。由于空腔的截面形状的尺寸因此在活塞中心轴线（Lp）侧的区域比在燃料喷射点（Oinj）附近的交点（e1，d1）变得不同，按顺序为了补偿这一点，通过将离开活塞销方向的横截面中的虚线的横截面形状校正为实线的横截面形状，使其扩大，横截面的尺寸因此，空腔的圆周方向的每个位置的形状更均匀，从而使得燃料和空气混合的条件均匀，并且改善发动机输出并减少有害排气材料。

2. 发明授权

US08714136B2 Direct fuel-injection engine 失效
标题翻译：直接燃油喷射发动机
公开(公告)号：US08714136B2
公开(公告)日：2014-05-06
申请号：US12745814
申请日：2008-12-12
申请人： Kenichiro Ikeya , Nobuhiko Sasaki , Hiroshi Sono , Yukihisa Yamaya , Akihiro Yamaguchi , Yoshimasa Kaneko , Goichi Katayama , Yutaka Tajima
发明人： Kenichiro Ikeya , Nobuhiko Sasaki , Hiroshi Sono , Yukihisa Yamaya , Akihiro Yamaguchi , Yoshimasa Kaneko , Goichi Katayama , Yutaka Tajima
IPC分类号： F02B3/00
CPC分类号： F02B23/0669 , F02B3/06 , F02B23/0621 , F02B23/0651 , F02B23/0657 , F02B23/0696 , F02B2275/14 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel-injection engine equipped with a pentroof-shaped piston, cross-sectional shapes containing a piston central axis (Lp) of a cavity recessed in a central part of the piston having a top face with the height varying in the circumferential direction are set so as to be basically identical at each position in the circumferential direction (see broken line). Since the sizes of the cross-sectional shapes of the cavity thereby become different in a region further on the piston central axis (Lp) side than intersection points (e1, d1) in the vicinity of a fuel injection point (Oinj), in order to compensate for this, by correcting in a cross section that is away from the piston pin direction the cross-sectional shape of the broken line into the cross-sectional shape of a solid line so that it enlarges, the size of the cross-sectional shape at each position of the circumferential direction of the cavity is thereby made more uniform, thus making the conditions in which fuel and air are mixed uniform and improving the engine output and reducing harmful exhaust materials.
摘要翻译：在配备有五角柱形活塞的直接燃料喷射发动机中，包含在活塞的中心部分凹陷的空腔的活塞中心轴线（Lp）的横截面形状具有顶面，其高度在圆周方向上变化被设定为在圆周方向上的每个位置基本相同（参见虚线）。由于空腔的横截面形状的大小因此在活塞中心轴线（Lp）侧的区域比在燃料喷射点（Oinj）附近的交点（e1，d1）变得不同，按顺序为了补偿这一点，通过将离开活塞销方向的横截面中的虚线的横截面形状校正为实线的横截面形状，使其扩大，横截面的尺寸因此，空腔的圆周方向的每个位置的形状更均匀，从而使得燃料和空气混合的条件均匀，并且改善发动机输出并减少有害排气材料。

3. 发明授权

US08627798B2 Direct fuel-injection engine 失效
标题翻译：直接燃油喷射发动机
公开(公告)号：US08627798B2
公开(公告)日：2014-01-14
申请号：US12620407
申请日：2009-11-17
申请人： Akihiro Yamaguchi , Yoshimasa Kaneko , Yukihisa Yamaya , Yutaka Tajima , Kenichiro Ikeya , Goichi Katayama , Nobuhiko Sasaki , Hiroshi Sono
发明人： Akihiro Yamaguchi , Yoshimasa Kaneko , Yukihisa Yamaya , Yutaka Tajima , Kenichiro Ikeya , Goichi Katayama , Nobuhiko Sasaki , Hiroshi Sono
IPC分类号： F02F3/26
CPC分类号： F02B23/0651 , F02B23/0669 , F02B23/0672 , Y02T10/125
摘要： A direct fuel-injection engine includes a piston, a cavity recessed in a central part of a top face of the piston, and a fuel injector. At a main injection collision point of a fuel-injection axis when main injection is performed while the piston is near top dead center, a main injection collision angle formed between its tangent and the fuel-injection axis is set at an obtuse angle. Fuel colliding with the main injection collision point is deflected towards a cavity open end side. At a secondary injection collision point of the fuel-injection axis when performing secondary injection with the piston is further from top dead center, a secondary injection collision angle formed between its tangent and the fuel-injection axis is set at one of a right angle and an acute angle. Fuel colliding with the secondary injection collision point is deflected primarily in the circumferential direction of the cavity.
摘要翻译：直接燃料喷射发动机包括活塞，凹入活塞顶面的中心部分的腔体和燃料喷射器。在活塞接近上死点时进行主喷射时的燃料喷射轴的主喷射碰撞点，在其切线与燃料喷射轴之间形成的主喷射碰撞角度被设定为钝角。与主喷射碰撞点碰撞的燃料朝向空腔开放端侧偏转。在与活塞进行二次注射的燃料喷射轴的二次喷射碰撞点比上止点更远的地方，在其切线和燃料喷射轴之间形成的二次喷射碰撞角度被设定为直角和一个锐角。与二次注射碰撞点碰撞的燃料主要在空腔的圆周方向上偏转。

4. 发明申请

US20100186709A1 DIRECT FUEL INJECTION DIESEL ENGINE 失效
标题翻译：直接燃油喷射柴油发动机
公开(公告)号：US20100186709A1
公开(公告)日：2010-07-29
申请号：US12305880
申请日：2007-04-11
申请人： Kenichiro Ikeya , Yukihisa Yamaya , Nobuhiko Sasaki , Tatsuya Uchimoto , Yutaka Tajima , Mitsuhiro Shibata , Hiroshi Sono
发明人： Kenichiro Ikeya , Yukihisa Yamaya , Nobuhiko Sasaki , Tatsuya Uchimoto , Yutaka Tajima , Mitsuhiro Shibata , Hiroshi Sono
IPC分类号： F02F3/24 , F02F3/00
CPC分类号： F02F3/26 , F02B3/06 , F02B23/0651 , F02B23/0657 , F02B23/0669 , F02B23/0696 , F02B2275/14 , F02F2001/241 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine equipped with a pentroof-shaped piston, when fuel is injected into a cavity (25) recessed in a central part of a piston (13), for which the height of a top face changes in the circumferential direction, from a fuel injection point (Oinj) of a fuel injector disposed on a piston central axis along a plurality of fuel injection axes (Li1,Li2), if a cross-section of the cavity (25) passing along the fuel injection axis (Li1,Li2) is defined as a fuel injection cross-section (Sn), a cross-sectional shape (see shaded portion) of the cavity (25) defined by first to third specific points (An, Bn, Cn) on the fuel injection cross-section (Sn) is set so as to be substantially equal for each fuel injection cross-section (Sn). By so doing, the conditions in which fuel and air are mixed in each fuel injection cross-section (Sn) can be made uniform, the engine output can be improved, and harmful exhaust substances can be reduced.
摘要翻译：在配备有五角柱形活塞的直接燃料喷射式柴油发动机中，当将燃料喷射到凹陷在活塞（13）的中心部分的空腔（25）中时，顶面的高度在圆周方向上变化，如果沿着燃料喷射轴线（25）通过的空腔（25）的横截面，则沿着多个燃料喷射轴线（Li1，Li2）从设置在活塞中心轴线上的燃料喷射器的燃料喷射点（Oinj） Li1，Li2）定义为燃料喷射截面（Sn），由燃料上的第一至第三特定点（An，Bn，Cn）限定的空腔（25）的横截面形状（参见阴影部分）喷射截面（Sn）被设定为对于每个燃料喷射截面（Sn）基本相等。通过这样做，能够使各燃料喷射截面（Sn）中的燃料和空气混合的条件均匀，能够提高发动机输出，能够降低有害排气物质。

5. 发明申请

US20100006061A1 DIRECT FUEL INJECTION DIESEL ENGINE 失效
标题翻译：直接燃油喷射柴油发动机
公开(公告)号：US20100006061A1
公开(公告)日：2010-01-14
申请号：US12305342
申请日：2007-04-11
申请人： Mitsuhiro Shibata , Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Yukihisa Yamaya
发明人： Mitsuhiro Shibata , Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Yukihisa Yamaya
IPC分类号： F02F3/24 , F02B23/00
CPC分类号： F02B23/0696 , F02B3/06 , F02B23/0621 , F02B23/0657 , F02B23/0669 , F02B2275/14 , F02F1/242 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine having a piston with a pentroof-shaped top face, with regard to a pentroof-shaped piston (13) with a cavity (25) recessed in a central part of the top face, a radial width S of a squish area (26) formed between an outer peripheral part of the top face and a lower face of a cylinder head (14) changes in the circumferential direction of the piston (13). By setting a squish clearance H large for a portion where the radial width S of the squish area (26) is large and setting the squish clearance H small for a portion where the radial width S of the squish area (26) is small, more specifically, by setting S/H so that it is constant in the circumferential direction, it is possible to make the strength of the squish flow uniform in the circumferential direction of the piston, thus promoting the mixing of air and fuel and reducing harmful exhaust components.
摘要翻译：在具有具有五角形顶面的活塞的直接燃料喷射柴油发动机中，相对于具有在顶面的中心部分凹陷的空腔（25）的五角形活塞（13），径向宽度S为在顶面的外周部和气缸盖（14）的下面之间形成的挤压区域（26）沿活塞（13）的周向发生变化。通过对挤压区域（26）的径向宽度S大的部分设定较大的挤压间隙H，并且对于挤压区域（26）的径向宽度S小的部分设定挤压间隙H较小，具体地说，通过将S / H设定为在圆周方向上恒定，可以使挤压流的强度在活塞的圆周方向上均匀，从而促进空气和燃料的混合以及减少有害排气成分。

6. 发明授权

US07861685B2 Direct fuel injection diesel engine 失效
标题翻译：直接燃油喷射柴油机
公开(公告)号：US07861685B2
公开(公告)日：2011-01-04
申请号：US12307215
申请日：2007-06-07
申请人： Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Yukihisa Yamaya
发明人： Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Yukihisa Yamaya
IPC分类号： F02F3/24
CPC分类号： F02B23/0696 , F02B1/08 , F02B3/06 , F02B23/0621 , F02B23/0651 , F02B23/0657 , F02B23/0669 , F02B2275/14 , F02B2275/40 , F02F2001/241 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine equipped with a pentroof-shaped piston, a collision angle (α) at which fuel injected in a direction in which the height of the top face of a piston (13) is high collides with a cavity (25) is set larger than a collision angle (β) at which fuel injected in a direction in which the height of the top face of the piston (13) is low collides with the cavity (25). By so doing, in a direction in which the height of the top face is high fuel that has collided with the cavity (25) easily rebounds upward, thus achieving effective combustion by mixing with a large amount of air present in the vicinity of the opening of the cavity (25) where the height is high, and in a direction in which the height of the top face is low it is difficult for fuel that has collided with the cavity (25) to rebound upward, thus achieving effective combustion by suppressing the flowing out of fuel or flame from the opening of the cavity (25) where the height is low, thereby appropriately mixing fuel and air in all directions in the circumferential direction of the cavity and making it possible to improve the engine output and reduce harmful exhaust substances.
摘要翻译：在配备有五角柱形活塞的直接燃料喷射柴油发动机中，在活塞（13）的顶面高度与空腔（25）碰撞的方向上喷射的燃料的碰撞角（α））被设定为大于在活塞（13）的顶面的高度低的方向上喷射的燃料与空腔（25）碰撞的碰撞角（＆amp; bgr）。通过这样做，在顶面的高度与空腔（25）碰撞的高度高的方向上容易地向上弹回，从而通过与存在于开口附近的大量空气混合而实现有效的燃烧在高度高的空腔（25）中，并且在顶面高度低的方向上，与空腔（25）碰撞的燃料难以向上回弹，从而通过抑制来实现有效的燃烧从高度低的空腔（25）的开口流出燃料或火焰，从而在空腔的圆周方向上适当地混合燃料和空气在各个方向上，并且可以改善发动机的输出并减少有害的排气物质。

7. 发明申请

US20090314253A1 DIRECT FUEL INJECTION DIESEL ENGINE 失效
标题翻译：直接燃油喷射柴油发动机
公开(公告)号：US20090314253A1
公开(公告)日：2009-12-24
申请号：US12307215
申请日：2007-06-07
申请人： Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Yukihisa Yamaya
发明人： Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Yukihisa Yamaya
IPC分类号： F02B3/00 , F02F3/00
CPC分类号： F02B23/0696 , F02B1/08 , F02B3/06 , F02B23/0621 , F02B23/0651 , F02B23/0657 , F02B23/0669 , F02B2275/14 , F02B2275/40 , F02F2001/241 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine equipped with a pentroof-shaped piston, a collision angle (α) at which fuel injected in a direction in which the height of the top face of a piston (13) is high collides with a cavity (25) is set larger than a collision angle (β) at which fuel injected in a direction in which the height of the top face of the piston (13) is low collides with the cavity (25). By so doing, in a direction in which the height of the top face is high fuel that has collided with the cavity (25) easily rebounds upward, thus achieving effective combustion by mixing with a large amount of air present in the vicinity of the opening of the cavity (25) where the height is high, and in a direction in which the height of the top face is low it is difficult for fuel that has collided with the cavity (25) to rebound upward, thus achieving effective combustion by suppressing the flowing out of fuel or flame from the opening of the cavity (25) where the height is low, thereby appropriately mixing fuel and air in all directions in the circumferential direction of the cavity and making it possible to improve the engine output and reduce harmful exhaust substances.
摘要翻译：在配备有五角形活塞的直接燃料喷射柴油发动机中，在活塞（13）的顶面的高度高的方向上喷射的燃料与空腔（25）碰撞的碰撞角（α））设定为大于在活塞（13）的顶面的高度低的方向上喷射的燃料与空腔（25）碰撞的碰撞角（β）。通过这样做，在顶面的高度与空腔（25）碰撞的高度高的方向上容易地向上弹回，从而通过与存在于开口附近的大量空气混合而实现有效的燃烧在高度高的空腔（25）中，并且在顶面高度低的方向上，与空腔（25）碰撞的燃料难以向上回弹，从而通过抑制来实现有效的燃烧从高度低的空腔（25）的开口流出燃料或火焰，从而在空腔的圆周方向上适当地混合燃料和空气在各个方向上，并且可以改善发动机的输出并减少有害的排气物质。

8. 发明授权

US08474431B2 Direct fuel-injected engine 失效
标题翻译：直接燃油喷射发动机
公开(公告)号：US08474431B2
公开(公告)日：2013-07-02
申请号：US12532984
申请日：2008-04-03
申请人： Hiroshi Sono , Tatsuya Uchimoto , Yukihisa Yamaya , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Nobuhiko Sasaki
发明人： Hiroshi Sono , Tatsuya Uchimoto , Yukihisa Yamaya , Kenichiro Ikeya , Yutaka Tajima , Mitsuhiro Shibata , Nobuhiko Sasaki
IPC分类号： F02F3/26 , F02F3/24 , F02B5/00
CPC分类号： F02B23/0669 , F02B3/06 , F02B23/0621 , F02B23/0651 , F02B23/0696 , F02B2275/14 , F02B2275/40 , Y02T10/123 , Y02T10/125
摘要： In a cross section in which squish flow from an outer peripheral part of a piston (13) toward a cavity (25) is large due to a width (W2) of a squish area (SA) being large and a squish clearance (C2) being small, a collision angle (α2) at which a fuel injection axis (Li2) collides with the cavity (25) is made large, whereas in a cross section in which squish flow is small due to the width of the squish area (SA) being small and the squish clearance being large, the collision angle at which a fuel injection axis collides with the cavity (25) is made small. This enables a tendency for fuel to flow out to the exterior of the cavity (25) in a cross section where the squish flow is small to be weakened, and a tendency for fuel to flow out to the exterior of the cavity (25) in a cross section where the squish flow is large to be strengthened, thereby making the conditions in which fuel and air are mixed uniform throughout the entire region of the cavity (25).
摘要翻译：在挤压区域（SA）的宽度（W2）大且挤压间隙（C2）的情况下，从活塞（13）的外周部到空腔（25）的挤压流动大的截面中，燃料喷射轴（Li2）与空腔（25）碰撞的碰撞角（α2）较小，而由于挤压区域的宽度（SA）的挤压流动较小的横截面）小且挤压间隙大时，燃料喷射轴与空腔（25）碰撞的碰撞角度变小。这使得燃料在挤压流动小的横截面中流出到空腔（25）的外部的趋势被削弱，并且燃料流出到空腔（25）的外部的趋势在其中挤压流量较大的横截面被加强，从而使得在空腔（25）的整个区域内燃料和空气混合均匀的条件。

9. 发明授权

US08056532B2 Direct fuel injection diesel engine 失效
标题翻译：直接燃油喷射柴油机
公开(公告)号：US08056532B2
公开(公告)日：2011-11-15
申请号：US12305342
申请日：2007-04-11
申请人： Mitsuhiro Shibata , Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Yukihisa Yamaya
发明人： Mitsuhiro Shibata , Hiroshi Sono , Nobuhiko Sasaki , Tatsuya Uchimoto , Kenichiro Ikeya , Yutaka Tajima , Yukihisa Yamaya
IPC分类号： F02F3/24
CPC分类号： F02B23/0696 , F02B3/06 , F02B23/0621 , F02B23/0657 , F02B23/0669 , F02B2275/14 , F02F1/242 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine having a piston with a pentroof-shaped top face, with regard to a pentroof-shaped piston (13) with a cavity (25) recessed in a central part of the top face, a radial width S of a squish area (26) formed between an outer peripheral part of the top face and a lower face of a cylinder head (14) changes in the circumferential direction of the piston (13). By setting a squish clearance H large for a portion where the radial width S of the squish area (26) is large and setting the squish clearance H small for a portion where the radial width S of the squish area (26) is small, more specifically, by setting S/H so that it is constant in the circumferential direction, it is possible to make the strength of the squish flow uniform in the circumferential direction of the piston, thus promoting the mixing of air and fuel and reducing harmful exhaust components.
摘要翻译：在具有具有五角形顶面的活塞的直接燃料喷射柴油发动机中，相对于具有在顶面的中心部分凹陷的空腔（25）的五角形活塞（13），径向宽度S为在顶面的外周部和气缸盖（14）的下面之间形成的挤压区域（26）沿活塞（13）的周向发生变化。通过对挤压区域（26）的径向宽度S大的部分设定较大的挤压间隙H，并且对于挤压区域（26）的径向宽度S小的部分设定挤压间隙H较小，具体地说，通过将S / H设定为在圆周方向上恒定，可以使挤压流的强度在活塞的圆周方向上均匀，从而促进空气和燃料的混合以及减少有害排气成分。

10. 发明授权

US07992536B2 Direct fuel injection diesel engine 失效
标题翻译：直接燃油喷射柴油机
公开(公告)号：US07992536B2
公开(公告)日：2011-08-09
申请号：US12305880
申请日：2007-04-11
申请人： Kenichiro Ikeya , Yukihisa Yamaya , Nobuhiko Sasaki , Tatsuya Uchimoto , Yutaka Tajima , Mitsuhiro Shibata , Hiroshi Sono
发明人： Kenichiro Ikeya , Yukihisa Yamaya , Nobuhiko Sasaki , Tatsuya Uchimoto , Yutaka Tajima , Mitsuhiro Shibata , Hiroshi Sono
IPC分类号： F02F3/26 , F02F3/28
CPC分类号： F02F3/26 , F02B3/06 , F02B23/0651 , F02B23/0657 , F02B23/0669 , F02B23/0696 , F02B2275/14 , F02F2001/241 , Y02T10/123 , Y02T10/125
摘要： In a direct fuel injection diesel engine equipped with a pentroof-shaped piston, when fuel is injected into a cavity (25) recessed in a central part of a piston (13), for which the height of a top face changes in the circumferential direction, from a fuel injection point (Oinj) of a fuel injector disposed on a piston central axis along a plurality of fuel injection axes (Li1,Li2), if a cross-section of the cavity (25) passing along the fuel injection axis (Li1,Li2) is defined as a fuel injection cross-section (Sn), a cross-sectional shape (see shaded portion) of the cavity (25) defined by first to third specific points (An, Bn, Cn) on the fuel injection cross-section (Sn) is set so as to be substantially equal for each fuel injection cross-section (Sn). By so doing, the conditions in which fuel and air are mixed in each fuel injection cross-section (Sn) can be made uniform, the engine output can be improved, and harmful exhaust substances can be reduced.
摘要翻译：在配备有五角柱形活塞的直接燃料喷射式柴油发动机中，当将燃料喷射到凹陷在活塞（13）的中心部分的空腔（25）中时，顶面的高度在圆周方向上变化，如果沿着燃料喷射轴线（25）通过的空腔（25）的横截面，则沿着多个燃料喷射轴线（Li1，Li2）从设置在活塞中心轴线上的燃料喷射器的燃料喷射点（Oinj） Li1，Li2）定义为燃料喷射截面（Sn），由燃料上的第一至第三特定点（An，Bn，Cn）限定的空腔（25）的横截面形状（参见阴影部分）喷射截面（Sn）被设定为对于每个燃料喷射截面（Sn）基本相等。通过这样做，能够使各燃料喷射截面（Sn）中的燃料和空气混合的条件均匀，能够提高发动机输出，能够降低有害排气物质。

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