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System and method for machine load detection

A machine and transmission technology, applied in the field of continuously variable transmission, can solve the problems of stall, insufficient engine speed, low system efficiency, etc.

Active Publication Date: 2015-02-04
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This time delay may result in machine wobble and therefore operator discomfort, system inefficiency, and / or increased drive assembly wear
In some cases, this time delay can cause the engine to under-rev and / or stall

Method used

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  • System and method for machine load detection
  • System and method for machine load detection
  • System and method for machine load detection

Examples

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Embodiment Construction

[0014] The present disclosure relates to transmission control, and more particularly, to a detector for detecting transient changes in torque across the transmission. The disclosed method and system are applicable not only to the CVT transmission described in the disclosed embodiments, but also to any other type of transmission that operates in a torque-controlled manner. In the following description, a CVT is discussed, but it should be understood that any type of transmission operating in a torque-controlled manner is contemplated.

[0015] figure 1 An outline of a wheel loader is shown as an example of a vehicle or machine 100 . figure 2 is a schematic diagram of the powertrain 200 of the vehicle 100 . Referring to these figures, a vehicle 100 includes an engine frame portion 102 connected to a non-engine frame portion 104 by an articulating joint 106 . Each of the engine frame portion 102 and the non-engine frame portion 104 includes a respective shaft 202 connected to...

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PUM

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Abstract

A transmission includes a transmission output speed (TOS) sensor providing a signal indicative of an output speed of the transmission. A controller estimates an actual torque output of the transmission and determines, in real time, a first TOS acceleration based on the signal provided by the transmission output speed sensor and a second TOS acceleration based on the actual torque estimation. The first and second accelerations are compared and a torque transient trigger is activated when the divergence exceeds a threshold value.

Description

technical field [0001] The present patent disclosure relates generally to transmissions suitable for use in vehicle and machine powertrains, and more particularly to continuously variable transmissions. Background technique [0002] Various vehicles or machines, such as wheel loaders, automobiles, trucks, and other wheeled machines, use a powertrain that includes a torque converter between the engine and the transmission. The torque converter can be used in a locked or unlocked mode when the machine is in motion, which provides a desired torque control feature for some machines that may encounter relatively immovable obstacles. For example, a wheel loader may push a bucket over a pile of material, a scarifier may encounter boulders, etc. Relying on torque converter slip provides a transmission output torque control effect, for example, when initiating contact with an obstacle, as it results in limiting transmission input torque and reduces the potential for low engine slugg...

Claims

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Application Information

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IPC IPC(8): B60K17/04B60K17/06F16H61/12F16H61/18
CPCB60W30/184B60W2510/1045Y10T477/79B60Y2200/411B60W10/06Y10T477/619Y10T477/78Y10T477/60B60W2510/105B60W10/103Y10T477/679
Inventor B·利斯特C·罗德斯M·拜尔M·巴恩格罗佛
Owner CATERPILLAR INC