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公开(公告)号：US11365697B2
公开(公告)日：2022-06-21
申请号：US16949137
申请日：2020-10-15
申请人： Caterpillar Inc.
发明人： Rajesh N. Nair , Samuel Were , James Harris Mutti
摘要： A controller may determine that a regeneration process associated with an engine of a machine is active. The controller may obtain, based on determining that the regeneration process is active, information concerning a speed of the engine, information concerning a load of the engine, and information concerning a fuel rate of the engine. The controller may select, based on the information concerning the speed of the engine, the information concerning the load of the engine, and the information concerning the fuel rate of the engine, a control process, of a plurality of control processes, to control an intake manifold absolute pressure (IMAP) of the engine to facilitate the regeneration process. The controller may cause, according to the selected control process, adjustment of one or more components of a variable geometry turbocharger (VGT) of the engine and an intake throttle valve (ITV) of the engine.
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公开(公告)号：US11131224B1
公开(公告)日：2021-09-28
申请号：US16853994
申请日：2020-04-21
申请人： Caterpillar Inc.
摘要： An exhaust system includes an exhaust pressure sensing system having sensor conduits structured to fluidly connect to an exhaust conduit in an exhaust system and feed exhaust to a differential pressure sensor. The differential pressure sensor produces a pressure signal indicative of a pressure drop across an exhaust aftertreatment element such as an exhaust filter. A plugging-mitigation conduit provides an always-open leakage path to convey condensate in a stream of leaked exhaust between the sensor conduits to prevent formation of deposits that can impact pressure sensing accuracy.
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公开(公告)号：US20220178315A1
公开(公告)日：2022-06-09
申请号：US17116000
申请日：2020-12-09
申请人： Caterpillar Inc.
发明人： Rajesh Narayanan Nair , Samuel Were , James Harris Mutti , Behnaz Ensan , James Vernon Dornberger, II , Rodney L. Menold , Timothy David Schwartz , Kevin Walsh
摘要： An engine braking system includes engine braking actuators for adjusting exhaust valve timings to engine braking timings in a cylinder-number braking mode. The system further includes an engine braking controller coupled to a control switch that produces a request indicating a requested cylinder-number braking mode. The engine braking controller is structured to transition exhaust valves to the engine braking timings, determine a control term to adjust intake air pressure for varying a braking power of the engine, and to adjust geometry of an exhaust turbine based on the control term. An adjusted speed of a compressor rotated by the exhaust turbine provides a change to intake air pressure that adjusts the braking power of the engine. Different levels of braking power are provided within different cylinder-number braking modes.
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公开(公告)号：US20210324780A1
公开(公告)日：2021-10-21
申请号：US16853994
申请日：2020-04-21
申请人： Caterpillar Inc.
IPC分类号： F01N11/00
摘要： An exhaust system includes an exhaust pressure sensing system having sensor conduits structured to fluidly connect to an exhaust conduit in an exhaust system and feed exhaust to a differential pressure sensor. The differential pressure sensor produces a pressure signal indicative of a pressure drop across an exhaust aftertreatment element such as an exhaust filter. A plugging-mitigation conduit provides an always-open leakage path to convey condensate in a stream of leaked exhaust between the sensor conduits to prevent formation of deposits that can impact pressure sensing accuracy.
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