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公开(公告)号：US20180230894A1
公开(公告)日：2018-08-16
申请号：US15434669
申请日：2017-02-16
Applicant: Caterpillar Inc.
Inventor： Andrew Loetz
Abstract: A prechamber assembly for a cylinder of a combustion engine is disclosed in which a plurality of ports placing a prechamber volume in fluid communication with the cylinder. A non-actuated, fixed orifice extends between the prechamber volume and a passageway formed in the prechamber assembly to permit combustion gases in the prechamber volume to enter the passageway. The passageway is configured to vent combustion gases therein out of the body. The orifice may reduce NOx emissions produced in the prechamber volume.
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公开(公告)号：US20170101923A1
公开(公告)日：2017-04-13
申请号：US14877165
申请日：2015-10-07
Applicant: Caterpillar Inc.
Inventor： Andrew Loetz
CPC classification number: F02B19/18 , F02B19/1095 , F02B19/12 , F02B19/16 , F02P9/002 , F02P9/007 , F02P13/00 , F02P15/02 , Y02T10/125
Abstract: An internal combustion engine having a main combustion chamber, a first prechamber, a second prechamber, a first ignition plug and a second ignition plug. The main combustion chamber is in fluid communication with a first prechamber and a second prechamber. The first ignition plug is disposed in the first prechamber for igniting a charge in the first prechamber to form a first flame jet directed into the main combustion chamber. The second ignition plug disposed in the second prechamber for igniting a charge in the second prechamber to form a second flame jet directed into the main combustion chamber. The first flame jet and the second flame jet overlap in the main combustion chamber.
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公开(公告)号：US20170101922A1
公开(公告)日：2017-04-13
申请号：US14877183
申请日：2015-10-07
Applicant: Caterpillar Inc.
Inventor： Andrew Loetz , Yongxian Gu
Abstract: In an aspect of the present disclosure, an internal combustion engine is disclosed. The internal combustion engine has a main combustion chamber, a prechamber, an insert in the prechamber, a fuel valve, and an ignition plug. The main combustion chamber is in fluid communication with the prechamber. The prechamber defines an upper volume and a lower volume about a central plane passing through a midpoint of the prechamber. The fuel valve is disposed in the upper volume and is configured to introduce charge into the prechamber. The ignition plug is configured to ignite the charge. The insert is disposed at least partially in the upper volume of the prechamber to promote mixing of the charge.
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公开(公告)号：US20180172543A1
公开(公告)日：2018-06-21
申请号：US15379629
申请日：2016-12-15
Applicant: Caterpillar Inc.
Inventor： Nicholas Edwin Wainscott , Jack Albert Merchant , Andrew Loetz
Abstract: A leak detection tool for a double walled fuel rail system is provided. The tool includes a body having a first end and a second end distal with respect to the first end. The tool includes a first passage extending from the first end at least partially towards the second end. The tool includes a second passage axially aligned with and extending from the first passage towards the second end. The tool includes a seat defined at an intersection of the first passage and the second passage. The tool also includes a sealing element provided in association with the seat within the second passage. The tool further includes a spring element provided within the second passage and in contact with the sealing element. The first end is configured to block fluid communication between outer passages of adjacent portions of the double walled fuel rail system.
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公开(公告)号：US20160169152A1
公开(公告)日：2016-06-16
申请号：US14567144
申请日：2014-12-11
Applicant: CATERPILLAR INC.
Inventor： Lucas Burger , Andrew Palmer , Brandon Bowditch , Andrew Loetz
IPC: F02F3/28
Abstract: A piston includes a piston body forming a crown portion and a skirt portion, the crown portion forming a bowl surrounded by a flat crown surface having an annular shape and disposed along a plane, the bowl and the flat crown surface meeting along a rim of the bowl having a generally circular shape. A generally cylindrical surface surrounds the crown portion and forms at least two grooves that define top and bottom land surfaces. The top land surface has a height along a centerline of the piston, and the piston has a nominal outer diameter configured to reciprocally operate within a bore having an inner diameter such that a ratio between the height of the top land surface and the inner diameter of the bore is between 3% and 4.5%.
Abstract translation: 活塞包括形成冠部和裙部的活塞体，所述冠部形成由具有环形形状并且沿着平面设置的扁平冠状表面包围的碗，所述碗和平坦的冠表面沿着 碗具有大致圆形的形状。 大致圆柱形表面围绕冠部并且形成限定顶部和底部表面的至少两个凹槽。 顶部陆面表面具有沿着活塞中心线的高度，并且活塞具有构造成在具有内径的孔内往复运动的标称外径，使得顶部表面的高度与内部直径之间的比率 孔径在3％至4.5％之间。
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Patent Agency Ranking
公开(公告)号：US20170089252A1
公开(公告)日：2017-03-30
申请号：US14870074
申请日：2015-09-30
Applicant: Caterpillar Inc.
Inventor： Andrew Loetz , Joel Hiltner
CPC classification number: F02B19/12 , F02B19/1023 , F02P3/00 , F02P9/007 , F02P13/00 , F02P15/02 , Y02T10/125
Abstract: An internal combustion engine having a main combustion chamber, a prechamber, a first ignition plug and a second ignition plug. The main combustion chamber in fluid communication with the prechamber. The first ignition plug disposed in the prechamber for igniting a charge to form a flame jet directed into the main combustion chamber. The second ignition plug disposed in the main combustion chamber for igniting the charge in the main combustion chamber in the path of the flame jet from the prechamber. The second ignition plug configured to ignite the charge in the main combustion chamber prior to the ignition of the charge by the first ignition plug in the prechamber.
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公开(公告)号：US20160237942A1
公开(公告)日：2016-08-18
申请号：US15137229
申请日：2016-04-25
Applicant: Caterpillar Inc.
Inventor： Scott Byron Fiveland , Andrew Loetz , Michael Flory , Joel Hiltner
CPC classification number: F02D41/1461 , F02D19/06 , F02D35/023 , F02D2200/1015 , Y02T10/36
Abstract: A fuel control system for an engine is provided. The fuel control system includes a first sensor configured to generate a signal indicative of a pressure within a cylinder of the engine, a second sensor configured to generate a signal indicative of an amount of Nitrous Oxide (NOx), a fuel reformer, an Air Fuel Ratio (AFR) unit, and a controller. The controller is configured to receive the signals indicative of the pressure and the amount of NOx. The controller is configured to determine a Coefficient of Variation (COV) of Indicated Mean Effective Pressure (IMEP) and compare the COV of IMEP and the amount of NOx with a threshold combustion stability and a threshold amount of NOx respectively. The controller is further configured to regulate at least one of the fuel reformer and the AFR unit to control at least one of the combustion stability and the amount of NOx.
Abstract translation: 提供了一种用于发动机的燃料控制系统。 燃料控制系统包括构造成产生指示发动机气缸内的压力的信号的第一传感器，配置成产生指示一氧化二氮（NOx）量的信号的第二传感器，燃料重整器，空气燃料 比率（AFR）单位和控制器。 控制器被配置为接收指示压力和NOx量的信号。 控制器被配置为确定指示平均有效压力（IMEP）的变异系数（COV），并将IMEP的COV和NOx的量分别与阈值燃烧稳定性和阈值量进行比较。 控制器进一步构造成调节燃料重整器和AFR单元中的至少一个以控制燃烧稳定性和NOx的量中的至少一个。
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公开(公告)号：US10724423B2
公开(公告)日：2020-07-28
申请号：US15434669
申请日：2017-02-16
Applicant: Caterpillar Inc.
Inventor： Andrew Loetz
Abstract: A prechamber assembly for a cylinder of a combustion engine is disclosed in which a plurality of ports placing a prechamber volume in fluid communication with the cylinder. A non-actuated, fixed orifice extends between the prechamber volume and a passageway formed in the prechamber assembly to permit combustion gases in the prechamber volume to enter the passageway. The passageway is configured to vent combustion gases therein out of the body. The orifice may reduce NOx emissions produced in the prechamber volume.
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公开(公告)号：US10545066B2
公开(公告)日：2020-01-28
申请号：US15379629
申请日：2016-12-15
Applicant: Caterpillar Inc.
Inventor： Nicholas Edwin Wainscott , Jack Albert Merchant , Andrew Loetz
Abstract: A leak detection tool for a double walled fuel rail system is provided. The tool includes a body having a first end and a second end distal with respect to the first end. The tool includes a first passage extending from the first end at least partially towards the second end. The tool includes a second passage axially aligned with and extending from the first passage towards the second end. The tool includes a seat defined at an intersection of the first passage and the second passage. The tool also includes a sealing element provided in association with the seat within the second passage. The tool further includes a spring element provided within the second passage and in contact with the sealing element. The first end is configured to block fluid communication between outer passages of adjacent portions of the double walled fuel rail system.
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公开(公告)号：US09903264B1
公开(公告)日：2018-02-27
申请号：US15296181
申请日：2016-10-18
Applicant: Caterpillar Inc.
Inventor： Mary Louise Yeager , Lucas Allen Burger , Andrew Loetz , Brett Zook
CPC classification number: F02B19/1085 , F02B19/12 , F02B43/10 , F02B2043/103 , F02D35/023 , F02D35/024 , F02D41/0027 , F02D41/1439 , F02D41/28 , F02D41/3094
Abstract: A control system for an engine cylinder having a pre-chamber and a main chamber includes a pressure sensor being provided in the pre-chamber, and a processor coupled to the pressure sensor. The processor is configured to measure pre-chamber pressure using the pressure sensor, determine a peak pre-chamber pressure from the measured pre-chamber pressure, calculate an estimated main chamber pressure corresponding to the peak pre-chamber pressure from at least one cylinder condition at ignition, calculate a pressure ratio of the peak pre-chamber pressure to the estimated main chamber pressure, calculate a fuel parameter for at least one of the pre-chamber and main chamber from the pressure ratio to achieve a desired pressure ratio, and generate a control signal to provide fuel to at least one of the pre-chamber and main chamber in accordance with the fuel parameter.
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