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Pressure staging in a continuously variable transmission

A derailleur, variable technology applied to elements with teeth, transmission controls, belts/chains/gears, etc., to address issues affecting subjective response and drive quality

Active Publication Date: 2016-04-13
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such factors can adversely affect the subjective response and drive quality of a vehicle equipped with a CVT

Method used

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  • Pressure staging in a continuously variable transmission
  • Pressure staging in a continuously variable transmission
  • Pressure staging in a continuously variable transmission

Examples

Experimental program
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Embodiment Construction

[0030] Referring to the drawings, wherein like reference numerals correspond to like or similar parts throughout the several views, figure 1 An example vehicle 10 is schematically shown in . The vehicle 10 includes a torque-generative device 12 shown as an internal combustion engine (E), but which could also be implemented as an electric machine or other suitable device for generating output torque. For consistency of illustration, torque-generative device 12 will be described below as engine 12 , without limiting the scope to such a design.

[0031] The vehicle 10 also includes a continuously variable transmission (CVT) 14 and a controller (C) 50 . see below figure 2 and 3 Described in further detail, the controller 50 is programmed to actively increase or stage the pressure level to the CVT 14 prior to an upcoming speed ratio change or gear shift of the CVT 14 to a desired speed ratio, and is performed in accordance with the method 100 of. The benefit of method 100 is ...

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PUM

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Abstract

A vehicle includes an engine, a continuously variable transmission (CVT), and a controller. The CVT has an output shaft, a primary pulley connected to and driven by the engine, a secondary pulley connected to the output shaft, and a belt. The pulleys each have mating halves with conical faces defining a gap in which the belt is positioned. Actuators act on one of the halves of the primary and secondary pulleys in response to a respective primary and secondary pressure. The controller detects a desired CVT ratio change in response to control inputs and determines a required shift force for achieving the desired ratio change. The controller also determines whether a calibrated rate of change is achievable. The controller adjusts the primary and / or secondary pressures when the calibrated rate is not achievable, including transmitting a pressure command to at least one of the primary and secondary actuators.

Description

technical field [0001] The present disclosure relates to pressure staging in continuously variable transmissions. Background technique [0002] A continuously variable transmission (CVT) is a type of power transmission capable of infinite variability between its highest and lowest possible speed ratios. Unlike conventional gear transmissions that use one or more planetary gear sets and multiple rotating and braking clutches to establish desired discrete gear states, CVTs instead use a variable diameter pulley system or variator to operate at calibrated speed ratios Transition anywhere within the range. A variator typically includes two pulleys interconnected via a chain or belt. The belt rides in the gap defined by the tapered surfaces of the mating halves of the pulleys. One of the pulleys is typically connected to the engine crankshaft and thus acts as a drive / primary pulley. Another pulley is connected to the output shaft of the CVT to act as a driven / secondary pulley...

Claims

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Application Information

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IPC IPC(8): F16H61/02F16H61/26
CPCF16H61/0204F16H61/26F16H61/662F16H59/14F16H59/42F16H59/68
Inventor P.G.奥塔内兹
Owner GM GLOBAL TECH OPERATIONS LLC
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