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Governor Characterization for Feedforward Torque Control

A technology of torque control and governor, applied in transmission control, components with teeth, transmission, etc., can solve problems such as insufficient to fully satisfy effective and accurate torque calibration

Active Publication Date: 2016-05-04
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although open-loop torque control with closed-loop feedback is available, these techniques are individually insufficient to fully meet the needs of efficient and accurate torque calibration

Method used

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  • Governor Characterization for Feedforward Torque Control
  • Governor Characterization for Feedforward Torque Control
  • Governor Characterization for Feedforward Torque Control

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] The present invention relates to machines that require a transmission to couple a power source with a final ground engaging mechanism such as wheels, tracks, and / or another powered function or implement. Examples of such machines include machines used in mining, construction, farming, transportation, or any other industry known in the art. For example, the machine may be an earth moving machine such as a wheel loader, excavator, dump truck, backhoe loader, motor grader, material handling machine, or the like. Additionally, one or more implements may be attached to the machine for various tasks including, for example, loading, compacting, lifting, mopping, and including, for example, buckets, compactors, fork lifts, brushes, grapples , Cutters, Shearing Devices, Blades, Breakers / Hammers, Screw Conveyors and others. In an exemplary embodiment, the system is adapted for use with a continuously variable transmission (CVT), such as may be used in wheel loader or motor grade...

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PUM

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Abstract

In an embodiment, torque control operation is provided in a transmission having a variable displacement variator (100) including a hydraulic actuator (104). The transmission is engaged in neutral (401) so that the variator output experiences approximately zero torque and a first hydraulic pressure sweep to the hydraulic actuator is commanded while the variator's motor speed ratio is recorded. the corresponding scan. The transmission is engaged in a locked mode providing a fixed output speed (403) and a second sweep of hydraulic pressure to the hydraulic actuators is commanded (404) and a corresponding sweep of the governor output torque is recorded during the sweep. A torque / pressure graph relating motor torque, motor speed ratio, and actuator pressure is then constructed ( 408 ) by scaling the sweeps of the motor speed ratio and the sweeps of the governor output torque. The resulting map ( 303 ) can be used to provide feed-forward torque control of the transmission.

Description

technical field [0001] This patent disclosure relates generally to transmission systems for propulsion, and more particularly to a method and system for calibrating the torque provided by such a transmission. Background technique [0002] In the case of machines for performing tasks and manipulating materials and objects, it is sometimes desirable to control the torque of the machine rather than just the speed or position of the machine or a part thereof. However, it is often difficult to precisely control torque due to lack of adequate calibration of the machine's drive train. For example, continuously variable transmissions have many hydrostatic variator static and dynamic qualities and parameters that can affect the output characteristics for any given input. More specifically, variability in hydrostatic variator components, such as valves and hydraulic pumps, and motor components often prevents precise torque control in the transmission. Although open-loop torque contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/14F16H61/66F16H61/04F16H15/38
CPCF16H61/472F16H2061/009F16H2061/0096B60W30/18054
Inventor B·利斯特C·布里克纳
Owner CATERPILLAR INC