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Work machine with torque limiting control for an infinitely variable transmission

A continuously variable transmission, working machinery technology, applied in mechanical equipment, control devices, engine control, etc., can solve the problems of loss of traction of driving wheels, operator can't know, engine can't load and decelerate, etc.

Inactive Publication Date: 2009-05-06
DEERE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At low ground speeds, the amount of power required by the work machine is a low percentage of what the engine can produce, so as the engine's output torque increases, the engine may not be able to load and decelerate
The operator would then have no way of knowing when the torque to the wheels increases
In this case, the drive wheels may lose traction and spin out due to unnoticed

Method used

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  • Work machine with torque limiting control for an infinitely variable transmission
  • Work machine with torque limiting control for an infinitely variable transmission

Examples

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Embodiment Construction

[0013] specific implementation plan

[0014] Referring now to FIG. 1 , there is shown a schematic diagram of a work machine 10 in accordance with one embodiment of the present invention. Work machine 10 may be a road grader, or a construction work machine such as a John Deere front loader, or a different type of work machine such as an agricultural, forestry, mining, or industrial work machine.

[0015] Work machine 10 includes an internal combustion engine 12 coupled to an IVT 14 , typically via an output crankshaft 16 from internal combustion engine 12 . Internal combustion engine 12 is assumed to be a diesel engine in the exemplary embodiment, but could also be a gasoline engine, a propane engine, or the like. The internal combustion engine 12 is sized and configured according to the application.

[0016] IVT 14 generally includes a hydraulic assembly 18 and a mechanical transmission assembly 20 . The IVT 14 assumes a hydromechanical transmission as shown in the embodime...

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PUM

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Abstract

A work machine (10) including an internal combustion (IC) engine (12) having an output, and an infinitely variable transmission (IVT) (14) coupled with the IC engine output. The IVT (14) includes an adjustable input / output (I / O) ratio. An operator adjustable torque control input device (40) provides an output signal. At least one electrical processing circuit (28) is coupled with the torque control input device (40) and configured for controlling the IC engine output and / or the IVT I / O ratio, dependent upon the output signal from the torque control input device (40).

Description

technical field [0001] The present invention relates to work machines, and more particularly to a work machine including an internal combustion engine coupled to a continuously variable transmission (IVT). Background technique [0002] A work machine, such as a construction work machine, an agricultural work machine or a forestry work machine, typically includes a tractor in the form of an internal combustion (IC) engine. The internal combustion engine may be a compression ignition engine (ie a diesel engine) or a spark ignition engine (ie a gasoline engine). For most heavy work machines, the tractor is in the form of a diesel engine with better overload, pull-down and torque characteristics for the associated work operation. [0003] The step load response of a transient internal combustion engine after a load shock is a function most influenced by engine displacement, engine hardware (e.g., whether it has a standard turbocharger, has a wastegate or a variable geometry tur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D29/00
CPCB60W10/06B60Y2200/41B60W2710/1022B60W30/1882B60W30/1884B60W10/103B60W2510/0638B60W30/1886E02F9/2253F16H61/66B60K17/06B60K17/00
Inventor 布瑞顿·托德·伊斯门克莱顿·乔治·杰纳森克
Owner DEERE & CO