Start ratio engagement control system and method

U.S. Patent Number: 5385515

Abstract: A control system and method for a vehicular semi-automatic mechanical transmission system (10) is provided for allowing controller or operator request for a direct downshift into a preselected start ratio, under certain predefined conditions. The direct downshift into the preselected start gear ratio is sequenced such that the target synchronous engine speed (OS*GR) at target gear ratio engagement is substantially equal to a preselected desirable, preferably constant, value for all selectable start ratios.

Inventors: Chan; Kwok W. (Chorley, GB2), Dobson; Michael (Leyland, GB2)

Assignee: Eaton Corporation (Cleveland, OH)

Application Number: 08/104,687

Issued: 1995-01-31

Expired: 2007-01-31

Classes: 477/75 ; 477/78

Field of search: 477/75,78,122,154

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