F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 47/00 (2006.01) F16H 61/02 (2006.01) F16H 61/16 (2006.01) F16H 59/52 (2006.01) F16H 59/62 (2006.01) F16H 59/66 (2006.01) F16H 61/21 (2006.01)
Patent
CA 2082010
G-9024 C-4374 GRADEABILITY-BASED SHIFT PATTERN CONTROL FOR AN AUTOMATIC TRANSMISSION Abstract of the Disclosure An improved shift pattern control in which successive upshifting and downshifting is avoided in conditions of above normal loading by inhibiting upshifting to a speed ratio having insufficient gradeability in relation to a measure of the actual loading. In essence, the control continually monitors the gradeability of the various forward speed ratios of the transmission in relation to a measure of the actual grade load to determine their excess gradeability, and removes from the shift pattern those speed ratios having insufficient excess gradeability. This ensures that the transmission will never be upshifted to a speed ratio that has insufficient gradeability for the given driving condition, thereby eliminating the successive upshifting and downshifting which occurs with conventional shift controls.
Nitz Larry Theodore
Rees Susan Lettie
Gowling Lafleur Henderson Llp
Saturn Corporation
LandOfFree
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