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Power-based underspeed control

A low-speed, controller-based technology with applications in speed/acceleration control, control devices, engine control, etc., capable of solving brief, inability to attempt an accurate and complete overview of prior art

Inactive Publication Date: 2011-02-02
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this section is understandably too brief to attempt to provide a precise and complete overview of the prior art

Method used

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  • Power-based underspeed control
  • Power-based underspeed control
  • Power-based underspeed control

Examples

Experimental program
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Embodiment Construction

[0019] A typical EUA system operates by sensing that the difference between the requested and actual engine speed exceeds a predetermined threshold. The EUA reduces transmission, implement, and / or parasitic power requirements when a difference in compliance is detected. An operator may desire a rapid increase in machine or engine speed or power, and therefore request a step change in a related parameter. The onboard EUA is used to save the engine from stalling due to standstill (low speed), for example by reducing the load on the engine.

[0020] An EAU without the disclosed improvements may cause some performance deficits under low throttle and low load operation, and may negate the anti-stalling feature of the EUA, but this will result in undesired engine stalling under certain conditions. Instead, in one embodiment, machine performance is optimized through the technique of desired power shaping, which will be described subsequently. Desired power shaping techniques limit ...

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PUM

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Abstract

A method of adjusting the operation of an engine-driven machine (10) to avoid engine under-speeding entails converting (62) a received speed or torque command (22, 20) into a power command (21). When an engine under- speed condition is sensed, the system performs underspeed correction in the power domain before converting (65) the underspeed processed power command (23) back into the units of the original domain. The converted underspeed processed power command (23) is issued to the transmission (12) or other component to alleviate the engine under-speeding condition.

Description

technical field [0001] Generally, the present invention relates to systems and methods for controlling CVT transmissions, and more particularly, to anti-lugging systems and methods for machines having CVT transmissions. Background technique [0002] Most engines consist of multiple rotating parts and therefore have an ideal speed range where their power output is best. This ideal range may correspond, for example, to a range exhibiting peak torque output in terms of RPM. A larger allowable speed range encompasses this ideal range and includes both higher and lower speeds at which the engine can be run, even in a sub-optimal manner. Ultimately, speeds outside this permissible speed range make the engine unable to provide sustained operation. For example, speeds greater than the maximum speed within the allowable speed range can cause extreme acceleration or catastrophic failure of the engine, transmission, or tool system. [0003] At speeds lower than the lower limit of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02B60K31/00F16H61/66F16H63/00
CPCB60W50/087F02D31/001B60W30/188
Inventor B·D·霍夫F·A·德马科T·M·索普科M·巴恩格罗弗B·D·库拉斯
Owner CATERPILLAR INC