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Transmission shift schedule optimization based on calculated specific fuel consumption

A transmission, CVT technology, applied to elements with teeth, transmission control, belt/chain/gear, etc., to achieve the effect of improving fuel economy

Active Publication Date: 2019-10-18
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, certain types of engines can only operate efficiently within a narrow range of vehicle speeds

Method used

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  • Transmission shift schedule optimization based on calculated specific fuel consumption
  • Transmission shift schedule optimization based on calculated specific fuel consumption
  • Transmission shift schedule optimization based on calculated specific fuel consumption

Examples

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Embodiment Construction

[0017] As required, specific embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that can be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0018] A step ratio transmission includes a finite number of selectable transmission ratios. Accordingly, step ratio transmissions are typically associated with a shift schedule having a table of desired ratios under various operating conditions. If the transmission shifts from the first gear ratio to the second gear ratio without any intervening gear ratios when the transmission is sh...

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Abstract

A vehicle includes a transmission and a controller. The controller is configured to receive a torque request, calculate a Specific Fuel Consumption (SFC) for satisfying the torque request in an initial gear and in an alternate gear, and command the transmission to shift from the initial gear into the alternate gear in response to the calculated SFC for satisfying the torque request in the alternate gear being less than the calculated SFC for satisfying the torque request in the initial gear.

Description

technical field [0001] The present disclosure relates to the field of automatic transmissions for motor vehicles. More specifically, the present disclosure relates to a system and method for planning shifts between gear ratios of a transmission. Background technique [0002] Some vehicles are used over a wide range of vehicle speeds, including both forward and reverse motion. However, certain types of engines can only operate efficiently within a narrow range of vehicle speeds. Therefore, transmissions capable of efficiently transmitting power at multiple speed ratios are often employed. When the vehicle is at low speeds, the transmission typically operates at high speed ratios to enable multiplication of engine torque for improved acceleration. At high vehicle speeds, operation of the transmission at low speed ratios allows engine speeds to be associated with quiet, fuel-efficient cruising. Typically, a transmission has a housing mounted to the vehicle structure, an inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/16F16H61/04
Inventor 米斯特德湛·J·扬科维奇大卫·G·哈格纳斯蒂芬·李·库珀戴征宇胡国鹏姜洪
Owner FORD GLOBAL TECH LLC