Damper lock-out clutch and motor/generator cooling multiplexed control system and method for an electrically variable hybrid transmissions
AssigneeGeneral Motors Corporation
InventorsCharles F. Long, Michael D. Foster
Life of this patent
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Abstract
The present invention provides a multiplexed control system, employing a single solenoid valve, to selectively control the damper lock-out clutch and motor/generator cooling of an electronically variable hybrid transmission. The present invention also contemplates a method of selectively controlling damper lock-out clutch engagement and motor/generator cooling for an electrically variable hybrid transmission control.
Claims10
A system for controlling damper lock-out clutch engagement and motor/generator cooling for an electrically variable hybrid transmission comprising:
- a selectively engageable damper lock-out clutch;
- a damper trim valve operable to effect engagement of said selectively engageable damper lock-out clutch;
- at least one motor/generator cooling valve operable to provide a calibrated flow rate of fluid to cool at least one motor/generator;
- a selectively actuatable solenoid valve operable to selectively provide control pressure to said damper trim valve and said at least one motor/generator cooling valve;
- and
- a multiplex valve operable to selectively direct control pressure to said damper trim valve and said at least one motor/generator cooling valve.
A system for controlling damper lock-out clutch engagement and motor/generator cooling for an electrically variable hybrid transmission comprising:
- a control pressure source of fluid;
- a selectively engageable damper lock-out clutch;
- a damper trim valve with a spring set position and a trim position, wherein said damper trim valve is operable to effect engagement of said damper lock-out clutch when said damper trim valve is in said trim position, and to disengage said damper lock-out clutch when said damper trim valve is in said spring set position;
- at least one motor/generator cooling valve operable to selectively provide variable rates of fluid flow to effect cooling of at least one motor/generator;
- and
- a multiplex valve having a first position enabling communication of said fluid to said damper trim valve but not said at least one motor/generator cooling valve, and a second position enabling communication of said fluid to said at least one motor/generator cooling valve but not said damper trim valve.
Dependencies are inferred from the claim text.