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Transfer case clutch calibration method

A transfer case and clutch technology, applied in the direction of clutch, instrument, transmission control, etc.

Active Publication Date: 2010-06-16
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the transfer case clutch is an electromechanical or hydromechanical device, the repeatability of its operation accuracy involves greater tolerances than electronic clutch control systems

Method used

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  • Transfer case clutch calibration method
  • Transfer case clutch calibration method
  • Transfer case clutch calibration method

Examples

Experimental program
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Embodiment Construction

[0019] see now figure 1 , which shows various parts of the transfer case calibration method according to the present invention. A transfer case assembly 10 is placed on an inspection station or positioner 12 after being fabricated on and by a conventional assembly line 14 . The transfer case assembly 10 includes a housing 20 and an input shaft 22 coupled to and driven by the output of an automatic or manual transmission (not shown) of a four wheel drive vehicle. The input shaft 22 may directly drive an output shaft 24, or the two shafts may be coupled by a range selection device such as a planetary gear train (not shown) to provide both a direct (high range) output and a reduction (low gear) output. Operably disposed between a primary output shaft 24 and a secondary output shaft 26 is an adjustable secondary driveline clutch assembly 28 . The adjustable secondary driveline clutch assembly 28 may be an electric, electromechanical, hydraulic, electrohydraulic, or any other ty...

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PUM

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Abstract

A method of improving performance of secondary driveline clutches in motor vehicle transfer cases includes the steps of testing each manufactured transfer case to determine the clutch drive current versus torque transfer function, fitting such determined function to one of a small number of predetermined performance curves and incorporating an identification of the selected one of such predetermined performance curves in the transfer case. When the transfer case is installed in a vehicle, the curve identification is read and the transfer case control module (TCCM) adjusts its clutch drive signal in accordance with the predetermined curve to achieve known and desired torque transfer through the clutch with a given clutch drive signal.

Description

Background of the invention [0001] The present invention relates generally to a method of achieving improved transfer case clutch performance, and more particularly to a method of determining clutch current as a function of torque output and utilizing this determination to achieve improved transfer case clutch performance. [0002] Many four-wheel drive vehicles are rated to run in two-wheel drive and contain sensors and control systems that automatically switch a transfer Box clutch converts to four-wheel drive. Such adaptive four-wheel drive systems are carefully tuned by the vehicle manufacturer, typically through extensive road testing, to achieve desired performance and optimize safety and control. The primary operating parameter so determined is the relationship between wheel slip and the speed and degree of transfer case clutch engagement per unit of time (dc / dt) when a threshold amount of wheel slip is encountered. In such vehicles, the sensing of the wheel speed, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D48/06G01M13/02
CPCF16D2500/3028B60K23/0808F16H2061/0053G01M13/022F16D2500/30405F16D2500/70223G01M13/025F16H2342/044F16D2500/10431F16D2500/5116F16D2500/70252F16D2500/50248F16D2500/3022F16D48/06G01M13/02
Inventor C·J·兰克
Owner BORGWARNER INC