Apparatus and method for assisting gear engagement in controllin

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477107, 477121, 364424095, B60K 4106

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active

056382715

ABSTRACT:
An electronic engine control monitors engine speed, vehicle speed and determines various engine RPM values and RPM ranges used in fueling a molar vehicle engine to achieve desired engine speeds prior to and during an automatic gear shift sequence. The engine is coupled to a manual/automatic transmission that includes manually selectable gear operation modes and automatically selectable gear operation modes. In order to assist gear engagement of the automatically selectable gears, the engine is fueled to a series of predetermined RPM levels to rock the transmission gears into engagement. In so doing, throttle control by the operator is first inhibited and the engine is first governed to a synchronous RPM value. Throttle control is returned to the operator if gear engagement is verified within a first predetermined delay period. If gear engagement is not verified, the engine RPM is periodically increased or decreased, depending on whether an upshift or downshift is attempted, and throttle control is returned to the operator if gear engagement is verified within a second or third predetermined delay period. If gear engagement is still not verified, the engine RPM is returned to the synchronous RPM value for a fourth predetermined delay period. If gear engagement does not occur within the fourth delay period, an error recovery routine is executed.

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