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Method for determining the current operating gear of a transfer case

A transfer case and gear technology, applied in the direction of components with teeth, transmission control, belt/chain/gear, etc., can solve the problem of incorrect calculation of the speed of the output shaft of the transmission, reduce the possibility and reduce the inconvenience. Correctly determined effect

Active Publication Date: 2017-06-13
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the off (wheel drive engine) state, the transmission ratio is no longer equal to the theoretical ratio - due to the overrunning clutch - which makes the inferred transmission output shaft speed calculation incorrect

Method used

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  • Method for determining the current operating gear of a transfer case
  • Method for determining the current operating gear of a transfer case
  • Method for determining the current operating gear of a transfer case

Examples

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Embodiment Construction

[0030] Those skilled in the art should understand that, for example, "upper", "lower", "upper", "downward", "top", "bottom", etc. are used to describe the accompanying drawings, and do not represent limitations on the scope of the present invention. The scope is defined by the appended claims.And then, the present invention can be described in the mode of function and / or logic module part and / or various processing steps herein.Should be appreciated that this module part can pass through any number of hardware , software and / or firmware components (which are configured to perform specific functions) are implemented.

[0031] Referring to the drawings, in which like reference numerals indicate like parts throughout the several views, a vehicle is schematically shown in figure 1 is shown at 20. see figure 1 , the vehicle 20 includes an engine 22 , a transmission 24 , a transfer case 26 , a rear axle (hereinafter referred to as driven axle 28 ) and a front or secondary axle (her...

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PUM

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Abstract

A method of determining a current operating range of a transfer case includes continuously calculating a current combined drive ratio (CDR) and classifying the current CDR as one of a predetermined number of desired CDRs. A counter is used to track when the current CDR is identified as the desired CDR. The different counts are then analyzed using simple mathematical operations to identify which gear ratio the transfer case is currently operating in.

Description

technical field [0001] The present invention generally relates to a method of determining the current operating range of a transfer case of a vehicle, such as high range or low range. Background technique [0002] A transfer case for a vehicle typically operates in two different gear ratios, commonly referred to as a high range and a low range. The vehicle controller must identify the current operating gear ratio, ie, the current operating gear, in order to provide proper engine and transmission control management, and to meet on-board diagnostic requirements. The vehicle controller must quickly and accurately identify the current operating gear of the transfer case in order to prevent damage to other components of the vehicle. For example, when the vehicle controller recognizes that the transfer case is operating in a low gear ratio, the vehicle controller may, for example, limit the vehicle speed to protect the planetary gear set of the transfer case, limit the engine tor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/04F16H61/18
CPCF16H61/68F16H61/70F16H63/42F16H59/70F16H2300/18F16H2059/706Y10T74/19079F16H61/0213
Inventor P.J.贾尔斯M.A.特利
Owner GM GLOBAL TECH OPERATIONS LLC