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Calibrating transmission motor torque

A technology of transmission and torque control, which is applied in the direction of transmission control, control device, engine control, etc., and can solve the problems that cannot completely eliminate the need for high-efficiency and accurate torque calibration

Active Publication Date: 2015-03-18
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While open-loop torque control with closed-loop feedback can be used with some success, it cannot completely eliminate the need for efficient and accurate torque calibration

Method used

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  • Calibrating transmission motor torque
  • Calibrating transmission motor torque
  • Calibrating transmission motor torque

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Embodiment Construction

[0014] The present invention relates to machines that require transmissions to link a power source to final ground contact mechanisms such as wheels, tracks, and / or other powered functions or implements. 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, motor grader, material handler, and the like. Also, one or more implements may be attached to the machine for various tasks including, for example, loading, compacting, lifting, brushing, including, for example, buckets, compactors, forklifts, brushes, buckets, cutters , shears, scrapers, breakers / hammers, augers and others. In an exemplary embodiment, the system is applied to a continuously variable transmission (CVT) as may be used in machine applications such as wheel loaders or motor graders.

[0015] In general, hydrostatic ...

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PUM

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Abstract

The described system and method allow a controller to calibrate a transmission variator of a continuously variable transmission for torque control by obtaining static and dynamic qualities and parameters of the variator through an automated calibration procedure. The system and method employ a pair of transmission mode configurations and operational configurations in combination to obtain system-specific information. In this way, the system is able to calibrate out the system variations to provide effective feed forward torque control of the continuously variable transmission. In an embodiment, a first calibration operation is performed while the transmission is neutralized and a second calibration operation is performed while the transmission is engaged in a mode providing a fixed variator output speed.

Description

technical field [0001] This patent application relates generally to transmission systems for propulsion and, more particularly, to methods and systems for calibrating the torque provided by such transmissions. Background technique [0002] Systems providing rotary shaft output can be classified by speed, power and torque. While these measures are related in some respects, the concept of torque corresponds more closely to the user's experience of operating such a machine. However, in some circumstances it has traditionally been difficult to precisely control torque due to lack of adequate calibration. For example, effective control of torque in continuously variable transmissions is difficult without precise system identification of many hydrostatic transmission static and dynamic qualities and parameters. More specifically, variability in hydrostatic transmission system components such as valves and hydraulic pump and motor components can hinder the ability to control torq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/456F16H61/66F16H61/00
CPCY10T477/62423Y10T477/688Y10T477/623B60W2050/0086Y10T477/6217F16H61/472Y10T477/6243F16H61/421F16H2342/00
Inventor J·斯托勒C·布里克纳B·利斯特
Owner CATERPILLAR INC