Interrelated power delivery controls – including engine control – Transmission control – With brake control
Reexamination Certificate
1999-12-23
2001-05-15
Marmor, Charles A (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
With brake control
C477S118000, C477S203000
Reexamination Certificate
active
06231474
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Related Applications
This application is related to and claims priority from British Patent Applications No. 9828452.4, filed Dec. 24, 1998, and 9900777.5, filed Jan. 15, 1999, both assigned to EATON CORPORATION, the assignee of this application.
2. Field of the Invention
The present invention relates to a control method/system for controlling downshifting in an at least partially automated mechanical transmission system. In particular, the present invention relates to the control of downshifting in a vehicular automated mechanical transmission system wherein the system senses operation of an engine brake and the vehicle service brakes (also called foot brakes) and will modify downshift points as a function thereof.
2. Description of the Prior Art
Fully or partially automated mechanical transmission systems for vehicular use are known in the prior art, as may be seen by reference to U.S. Pat. Nos. 4,361,060; 4,648,290; 4,722,248; 4,850,236; 5,389,053; 5,487,004; 5,435,212 and 5,755,639. The use of engine brakes (also known as compression brakes, exhaust brakes or Jake brakes) and transmission controls utilizing same are known in the prior art, as may be seen by reference to U.S. Pat. Nos. 5,409,432 and 5,425,689.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a control for a vehicular automated mechanical transmission system which will sense the operator's manual operation of the engine brake and/or foot brake systems and will modify the transmission shift points as a function thereof. In particular, the transmission downshift shift points will be modified in a manner which will provide the vehicle operator with the level of engine braking perceived to be requested by his/her operation of the engine brake and/or foot brake control.
This and other objects and advantages of the present invention will become apparent from a reading of the following description of the preferred embodiment taken in connection with the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a schematic illustration, in block diagram formt, of an automated mechanical transmission system utilizing the control of the present invention.
FIG. 2
is a schematic illustration, in graphical format, illustrating shift point profiles for the transmission system of
FIG. 1
according to the present invention.
FIGS. 3A and 3B
are schematic illustrations, in flow chart format, of the control of the present invention.
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Gibbons David Edward
Hawarden Jeffrey Philip
Stasik Anthony
Tuson John Slater
Wheeler Robert Stanley
Eaton Corporation
Gordon Howard D.
Ho Ha
Marmor Charles A
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