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Closed loop transmission torque control

A closed-loop control, transmission technology, applied in the control device, transmission control, components with teeth, etc., can solve the problem of inability to accurately control the transmission output torque, vibration, instability, etc., to improve the transmission performance and response. Effect

Inactive Publication Date: 2013-06-26
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under certain circumstances, it has traditionally been difficult to precisely control the torque due to the slow frequency response and non-linear behavior of the transmission
[0003] Although simple PID control schemes are available, such systems typically cannot precisely control the transmission output torque
This is mainly due to control lag and can lead to vibration, instability and generally poor user experience
While gain can speed up response time, it can also lead to instability and overshoot
In particular, while insufficient gain is not enough to alleviate lag problems, too much gain can cause control ringing or underdamped vibration

Method used

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  • Closed loop transmission torque control
  • Closed loop transmission torque control
  • Closed loop transmission torque control

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Embodiment Construction

[0013] The present invention relates to machines that require a transmission to connect a power source to a final ground contact mechanism (eg, wheels, tracks, etc. and / or other powered functions or implements). Examples of such machines include those used in mining, construction, farming, transportation or any other industry known in the art. The machine may be an earth moving machine such as a wheel loader, excavator, dump truck, backhoe, motor grader, material handler, and the like. Additionally, one or more implements may be attached to the machine for a variety of tasks including, for example, loading, compacting, lifting, painting, including, for example, buckets, compactors, fork lifts, brushes, grapples, Cutters, shears, scrapers, breakers / hammers, drills, etc. In one exemplary embodiment, the system is applied to a continuously variable transmission (CVT) such as may be used in a wheel loader or motor grader.

[0014] In summary, the systems and control methods desc...

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PUM

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Abstract

The described system and method provide improved transmission performance and response with closed loop torque feedback by implementing situational gain scheduling and nonlinear control techniques for continuously variable transmissions. The system uses contextual information regarding the operation of the machine to determine a gain to be applied in associated PID control logic. In an embodiment, the determined gain is applied in the integral portion of the closed loop controller.

Description

technical field [0001] The present invention relates generally to transmission systems for propulsion and, more particularly, to methods and systems for effecting closed loop control of transmission output torque. Background technique [0002] Systems that provide a rotating shaft output can be classified by speed, power and torque. Although these measurements are somehow related, the concept of torque more closely aligns with the experience of a user operating such a machine. However, under certain circumstances, it has traditionally been difficult to precisely control torque due to the slow frequency response and non-linear behavior of transmissions. [0003] Although simple PID control schemes can be used, such systems typically cannot accurately control the transmission output torque. This is mainly due to control lag and can lead to vibration, instability and generally a poor user experience. Although gain can speed up response time, it can also lead to instability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/66F16H61/04F16H61/00
CPCB60W2050/0011B60W2050/0012F16H61/472
Inventor J·斯托勒A·瓦卡里
Owner CATERPILLAR INC