F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
123/248, 138/79.
F16H 61/12 (2006.01) F16H 61/02 (2006.01)
Patent
CA 1309927
LOGIC VALVING FOR A TRANSMISSION CONTROL Abstract of the Disclosure A transmission control has a plurality of solenoid controlled hydraulic valves that are selectively operable to control the establishment of various drive ratios in a six speed transmission. A logic valve, comprised of two spool valves and a solenoid, is disposed between the solenoid controlled hydraulic valves and some of the friction drives in the transmission which establish the various drive ratios. The logic valves are operable to establish the fourth ratio if an electrical malfunction occurs during operation in the fourth or fifth ratios, or to establish the fifth ratio if electrical malfunction occurs while operating in the sixth ratio, or to establish the third ratio if an electrical malfunction occurs while operating in the first, second or third forward speed ratios. In the alternative, the logic valves can be controlled to establish fourth ratio whenever an electrical malfunction occurs when the transmission is operating in the second through fifth ratios.
605812
Boyer Robert C.
Long Charles F.
Mccauley Phillip F.
General Motors Corporation
Gowling Lafleur Henderson Llp
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