Shift point strategy for hybrid electric vehicle transmission
First Claim
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1. A method for determining a shift point strategy, comprising:
- providing at least two power sources;
selectively coupling a hybrid vehicle transmission having an input shaft to said at least two power sources, said hybrid vehicle transmission receiving power from at least one of said power sources;
defining a speed of said transmission input shaft for best acceleration;
defining a speed of said transmission input shaft for best fuel economy;
determining driver intent in comparison to said best acceleration and said best fuel economy; and
setting a shift point based in part on at least said determining step.
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Abstract
A method for determining a shift point strategy in a hybrid vehicle includes providing at least two power sources, selectively coupling the two or more power sources to a hybrid vehicle transmission, defining an input shaft speed for best acceleration, defining an input shaft speed for best fuel economy, determining driver intent compared to the best acceleration and the best fuel economy, and setting a shift point of the hybrid vehicle transmission based, at least in part, on the driver intent.
93 Citations
25 Claims
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1. A method for determining a shift point strategy, comprising:
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providing at least two power sources;
selectively coupling a hybrid vehicle transmission having an input shaft to said at least two power sources, said hybrid vehicle transmission receiving power from at least one of said power sources;
defining a speed of said transmission input shaft for best acceleration;
defining a speed of said transmission input shaft for best fuel economy;
determining driver intent in comparison to said best acceleration and said best fuel economy; and
setting a shift point based in part on at least said determining step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining a shift point strategy, comprising:
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providing at least a first power source and a second power source, wherein said first power source is an internal combustion engine;
selectively coupling a hybrid vehicle transmission having an input shaft to said at least two power sources, said hybrid vehicle transmission being configured to selectively receive power from said at least first and second power sources;
defining a speed of said transmission input shaft for best acceleration;
defining a speed of said transmission input shaft for best fuel economy;
determining driver intent in comparison to said best acceleration and said best fuel economy, said driver intent being determined using driver demand torque as a fraction of total available torque, an apparent inertia of a vehicle, and a transmission gear position indication; and
setting a shift point based in part on at least said determining step. - View Dependent Claims (11, 12, 13)
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14. A method for operating a hybrid vehicle comprising:
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establishing a shift point strategy, wherein said establishing a shift point strategy includes providing at least two power sources, selectively coupling a hybrid vehicle transmission having an input shaft to said at least two power sources, said hybrid vehicle transmission receiving power from at least one of said power sources, defining a speed of said transmission input shaft for best acceleration, defining a speed of said transmission input shaft for best fuel economy, determining driver intent in comparison to said best acceleration and said best fuel economy, and setting a shift point based in part on at least said determining step;
determining an intermediate gear that falls within said shift point strategy; and
finalizing said intermediate gear. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for determining a shift point strategy in a hybrid transmission having a plurality of prime movers selectively coupled to an input shaft comprising:
a control unit configured to define a speed of said hybrid transmission input shaft for best acceleration, define a speed of said transmission input shaft for best fuel economy, determine driver intent in comparison to said best acceleration and said best fuel economy based in part at least on driver demand torque as a fraction of total available torque, and set a shift point based in part on at least said determining step. - View Dependent Claims (24, 25)
Specification