Electro-mechanical transmission control system
AssigneeGM Global Technology Operations LLC
InventorsPeter E. Wu, Ryan D Martini, Syed Naqi, Jy-Jen F. Sah, Osama Almasri, Hanne Buur, Andrew M. Zettel, Charles J Van Horn
Life of this patent
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Abstract
A system for robust fault detection in an electrically variable, hydraulically controlled transmission includes independently monitoring hydraulic pressure within a hydraulic control circuit and electric machine rotation for detecting clutch state faults.
Claims19
Method for redundant fault detection in an electrically variable, hydraulically controlled transmission operative to transmit mechanical power flow originating from an engine and electric machines to an output member through selective application of torque transfer clutches, comprising:
- monitoring hydraulic pressures within a hydraulic control circuit configured to selectively apply the torque transfer clutches, detecting therefrom a mismatch between a commanded clutch state and an actual clutch state, and executing a first remedial control operation upon the detecting of a mismatch between a commanded clutch state and an actual clutch state associated with the monitored hydraulic pressures within the hydraulic control circuit;
- and
- monitoring rotational speeds of the electric machines and the output member, detecting therefrom a mismatch between a commanded clutch state and an actual clutch state, and executing a second remedial control operation upon the detecting of a mismatch between a commanded clutch state and an actual clutch state associated with the monitored rotational speeds of the electric machines and the output member.
An electro-mechanical transmission control system, comprising:
- the electro-mechanical transmission, including a planetary gear set, a hydraulic circuit, and a plurality of hydraulically-actuated torque transfer clutches, said transmission operative to transmit mechanical power originating from an engine and electric machines to an output through selective application of the torque transfer clutches;
- a first subsystem including a control module directly signally connected to a plurality of pressure monitoring devices configured to monitor the hydraulic circuit, the first subsystem operative to control and monitor application of the torque transfer clutches, and, operative to execute a first remedial control operation upon detection of a fault in application of the torque transfer clutches;
- a second subsystem including a control module directly signally connected to sensors operative to monitor rotations of the electric machines, directly signally connected to a sensing system operative to monitor rotation of the output of the transmission, said second subsystem operative to control electric power to the electric machines, and operative to detect a fault in application of the torque transfer clutches based upon the rotations of the electric machines and the output of the transmission;
- and, operative to execute a second remedial control operation upon detection of a fault in the application of the torque transfer clutches.
System for redundantly detecting a fault in application of a torque transfer clutch in an electro-mechanical transmission, comprising:
- the electro-mechanical transmission including planetary gear sets, a hydraulic circuit, and a plurality of hydraulically-actuated torque transfer clutches, said transmission operative to transmit mechanical power flow originating from an engine and electric machines to an output through selective application of the torque transfer clutches;
- a first subsystem directly signally connected to a plurality of pressure monitoring devices adapted to monitor the hydraulic circuit, to control application of the torque transfer clutches, and to detect a fault in application of the torque transfer clutches based upon the pressure monitoring devices;
- a second subsystem directly signally connected to sensors operative to monitor rotation of the electric machines, directly signally connected to a sensing system operative to monitor rotation the output of the transmission, operative to control electric power to the electric machines, and operative to detect a fault based upon the rotation of the output of the transmission and the rotation of the electric machines;
- and
- the first and second subsystems mutually independent.
Dependencies are inferred from the claim text.