Torque converter slip control for multi-displacement engine
First Claim
1. A method for controlling slip in a torque converter coupled to a multi-displacement engine, the method comprising:
- enabling a predetermined slip rate offset to a base slip rate when the engine is operating in a full-displacement mode;
after enabling the slip rate offset, transitioning the engine to a partial-displacement mode upon the earlier of (1) achieving a current slip rate equal to the base slip rate plus the slip rate offset, and (2) achieving an elapsed time since enabling that exceeds a predetermined maximum delay;
maintaining the slip rate offset to the base slip rate when the engine is subsequently operating in the partial-displacement mode and when transitioning the engine back to the full-displacement mode; and
disenabling the slip rate offset after transitioning the engine back to the full-displacement mode.
19 Assignments
0 Petitions
Accused Products
Abstract
Prior to transitioning a multiple-displacement engine from a full-displacement engine operating mode to a partial-displacement engine operating mode, a base slip rate of a torque converter coupled to the engine engine is increased by a predetermined slip rate offset. The engine is then transitioned to partial-displacement mode upon the earlier of either achieving the desired offset slip rate, or once a maximum time delay has occurred since the slip rate offset was enabled. An offset slip rate is maintained throughout partial-displacement engine operation, and through a transition back to a full-displacement mode. The slip rate offset is removed or disenabled once the engine is again operating in the full-displacement mode. The slip rate offset is either a calibratable constant or is determined as a function of one or more suitable engine or vehicle operating parameters affecting vehicle NVH levels, such as engine speed and vehicle speed.
40 Citations
19 Claims
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1. A method for controlling slip in a torque converter coupled to a multi-displacement engine, the method comprising:
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enabling a predetermined slip rate offset to a base slip rate when the engine is operating in a full-displacement mode; after enabling the slip rate offset, transitioning the engine to a partial-displacement mode upon the earlier of (1) achieving a current slip rate equal to the base slip rate plus the slip rate offset, and (2) achieving an elapsed time since enabling that exceeds a predetermined maximum delay; maintaining the slip rate offset to the base slip rate when the engine is subsequently operating in the partial-displacement mode and when transitioning the engine back to the full-displacement mode; and disenabling the slip rate offset after transitioning the engine back to the full-displacement mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling slip in a torque converter coupled to a multi-displacement engine, the method comprising:
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when the engine is operating in a flail-displacement mode and immediately prior to a transition to a partial-displacement engine operating mode, adding a predetermined slip rate offset to a base slip rate; maintaining the slip rate offset to the base slip rate when subsequently transitioning the engine to the partial-displacement mode upon the earlier of (1) achieving a current slip rate equal to the base slip rate plus the slip rate offset, and (2) achieving an elapsed time since adding that exceeds a predetermined maximum delay; operating the engine in the partial-displacement mode, and transitioning the engine back to the full-displacement mode; and removing the slip rate offset to the base slip rate after transitioning the engine back to the full-displacement mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification