公开(公告)号：US11668255B2

公开(公告)日：2023-06-06

申请号：US17116000

申请日：2020-12-09

Applicant: Caterpillar Inc.

Inventor： Rajesh Narayanan Nair ,  Samuel Were ,  James Harris Mutti ,  Behnaz Ensan ,  James Vernon Dornberger, II ,  Rodney L. Menold ,  Timothy David Schwartz ,  Kevin Walsh

IPC: F02D13/04 ,  F02D13/02 ,  F02D41/24 ,  F02B37/24 ,  F01L13/06 ,  F02B37/12

CPC classification number: F02D13/04 ,  F01L13/065 ,  F02B37/24 ,  F02D13/0249 ,  F02D41/2422 ,  F02B2037/122 ,  F02D2200/0406 ,  F02D2200/101

Abstract: 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.

公开(公告)号：US20220178315A1

公开(公告)日：2022-06-09

申请号：US17116000

申请日：2020-12-09

Applicant: Caterpillar Inc.

Inventor： Rajesh Narayanan Nair ,  Samuel Were ,  James Harris Mutti ,  Behnaz Ensan ,  James Vernon Dornberger, II ,  Rodney L. Menold ,  Timothy David Schwartz ,  Kevin Walsh

IPC: F02D13/04 ,  F02D13/02 ,  F02D41/24 ,  F02B37/24

Abstract: 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.