F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/148, 341/68
F16H 61/06 (2006.01) F16H 61/00 (2006.01) F16H 61/02 (2006.01)
Patent
CA 1127270
074206-BWL ABSTRACT A control system used to change the gear ratio in a gear set regulated by a change-gear signal from a control unit is disclosed. A transducer provides an output torque signal which is compared to other signals for initiating the gear change. In another arrangement, an automatic transmission changes a gear ratio when engine torque is transferred from one member to another member of a three member planetary gear set. This transfer is accomplished through friction elements engaged by hydraulic pressure. A closed loop electrical circuit is completed between a transducer, which provides an electrical signal related to the output torque of the transmission, and a control valve, to vary the control valve pressure. A circuit for computing reaction torque is coupled between the transducer and a logic control circuit, which provides logic command signals for controlling operation of components in the closed loop circuit. The closed loop circuit includes a pulse width modulation circuit for regu- lating the control valve operation, and a feed-forward circuit to minimize the delay in the control valve portion of the system.
272809
Ivey John S.
Miller Alan L.
Borg-Warner Corporation
Macrae & Co.
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