Downshift control method/system for vehicular automated mechanic

Machine element or mechanism – Gearing – Interchangeably locked

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Details

74336R, 477124, F16H 5936

Patent

active

058732810

ABSTRACT:
A method and system for controlling downshifting of an automated mechanical transmission system which senses unsuccessful attempts to engage a predetermined downshift target gear ratio (GR.sub.T) due to engine speed remaining less than the synchronous engine speed (ES=OS*GR.sub.T) for engaging said target gear ratio and, in response to sensing such conditions, automatically initiates a degraded mode of operation wherein an achievable degraded mode target gear ratio (GR.sub.DMT <ES.sub.MAX .div.OS), synchronizable at achieved maximum engine speed (ES.sub.MAX), is identified and caused to be engaged.

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