Continuously variable transmission (cvt) ratio control

A transmission ratio, controller technology, applied in the direction of transmission control, elements with teeth, belts/chains/gears, etc.

Inactive Publication Date: 2017-11-10
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is in contrast to other mechanical transmissions that offer a fixed number of gear ratios

Method used

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  • Continuously variable transmission (cvt) ratio control
  • Continuously variable transmission (cvt) ratio control
  • Continuously variable transmission (cvt) ratio control

Examples

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Embodiment Construction

[0025] Embodiments of the present disclosure are described herein. It is to be understood, however, that the disclosed embodiments are merely examples and that other embodiments may take 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 utilize the embodiments. As will be understood by those of ordinary skill in the art, various features shown and described with reference to any one figure may be combined with features shown in one or more other figures to create a feature not explicitly shown or described. Example. The combinations of features shown provide representative embodiments for typical applications. Various combinations and modifications of the features consiste...

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Abstract

A vehicle includes an engine with an associated engine-speed sensor, and wheels each having a respective wheel-speed sensor. The vehicle also includes a continuously variable transmission (CVT) coupled to the engine and configured to operate at variable input-to-output ratios. At least one controller is programmed to reduce the operating ratio of the CVT in response to the engine-speed sensor indicating the engine is operating at idle speed and the wheel-speed sensor indicating the velocity is approximately zero. This provides less noise, vibration and harshness in the vehicle due to the reduced ratio that is possible during conditions in which a vehicle launch in that reduced ratio may not be acceptable.

Description

technical field [0001] The present disclosure relates to a vehicle control system for controlling an input-to-output ratio of a continuously variable transmission (CVT). Background technique [0002] A continuously variable transmission (CVT) is an automatic transmission that can change seamlessly through an infinite number of effective gear ratios between maximum and minimum values. This is in contrast to other mechanical transmissions that offer a fixed number of gear ratios. Contents of the invention [0003] According to one embodiment, a vehicle includes an engine with an associated engine speed sensor and wheels each with a respective wheel speed sensor. The vehicle also includes a continuously variable transmission (CVT) coupled to the engine and configured to operate with a variable input to output ratio. At least one controller is configured to reduce the operating gear ratio of the CVT in response to the engine speed sensor indicating that the engine is operati...

Claims

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Application Information

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IPC IPC(8): F16H61/662F16H61/664F16H59/44F16H59/74
CPCF16H59/44F16H59/74F16H61/66236F16H61/6646F16H2061/66204F16H2061/6641F16H59/22F16H61/66259F16H59/54F16H2059/366F16H59/18F16H61/662
Inventor 姜洪戴征宇陈卫田蒂莫西·L·萨金特许阳
Owner FORD GLOBAL TECH LLC
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