Back to results
US 2023/0286506 A1Published application
Gear shift actuation simplification
AssigneeEaton Cummins Automated Transmission Technologies, LLC
InventorGraeme Andrew Jackson
Life of this patent
Estimating the term…
Abstract
A transmission is subject to gear shift management that provides for shifting gears in a controlled manner in order to provide for a simplification of part and reduction in system complexity. In particular, a range synchronizer component can be replaced with a simplified range jaw clutch, without incurring a requirement for an installation of other components such as a motor generator or starter-generator.
Claims20
A system for a gear change, comprising:
- a splitter group that includes a splitter synchronizer;
- a main group that includes a first main jaw clutch and a second main jaw clutch;
- a range group that includes a range jaw clutch;
- wherein the splitter group, main group, and range group engage a ramping down torque task;
- wherein the range group engages a range sync task;
- wherein the splitter group and range group engage a shift splitter task;
- wherein the splitter group and the main group engage a main group synchronizing task;
- and
- wherein the main group engages a gear change completion task.
6 more elements
An upshift method for a gear shift, comprising:
- a first act of:
- preparing for the upshift by:
- ramping down torque, by an engine, and
- ramping down torque mode, by a main clutch;
- engaging a splitter synchronizer, in a splitter group;
- turning off an inertia brake;
- engaging a main box jaw clutch;
- engaging a range jaw clutch;
- a second act of disengaging the range jaw clutch;
- a third act of bringing to an open sync range, by the inertia brake, and placing the range jaw clutch in neutral;
- a fourth act of stopping its “on sync range”, and returning to an off status, by the inertia brake, and engaging the range jaw clutch;
- a fifth act of disengaging the splitter synchronizer as an engine speed control is to target, the main clutch is open the inertia brake remains off, the main box jaw clutch and the range jaw clutch remain engaged;
- a sixth act of moving to sync, by the splitter synchronizer;
- a seventh act of moving to engage, by the splitter synchronizer;
- an eighth act of disengaging the main box jaw clutch;
- a ninth act of:
- while each of the splitter synchronizer, the inertia brake, and the range jaw clutch continue their respective status:
- putting the engine in a mode of speed match,
- turning from a mode of open to a mode of sync main, by the main clutch, and
- placing the main box jaw clutch at neutral;
- a tenth act of placing the main clutch at a slip condition, and engaging the main box jaw clutch;
- and
- an eleventh act of engaging a next gear by:
- finalizing the gear shift,
- ramping up an engine torque, and
- ramping up a torque on the main clutch.
23 more elements
A system for a gear change, comprising:
- a splitter group that includes a splitter synchronizer;
- a main group that includes a first main jaw clutch and a second main jaw clutch;
- a range group that includes a range jaw clutch;
- and
- a processor coupled to a memory that includes instructions that, when executed by the processor, cause the processor to engage in a controlled manner to control a ramping down torque task, a range sync engaging task, a shift splitter engaging task, a main group synchronizing task, and a gear change completion task.
2 more elements
Dependencies are inferred from the claim text.