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US 9,026,327 B2Granted
Method and apparatus for executing a shift path to a target powertrain state
AssigneeGM Global Technology Operations LLC
InventorsLawrence A. Kaminsky, Besim Demirovic, Pinaki Gupta, Anthony H. Heap
Life of this patent
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Abstract
A method for controlling a transmission of a powertrain system includes executing a single source shortest path search to identify a preferred shift path originating with an initial powertrain state and terminating at a target powertrain state, wherein the single source shortest path search employs transition-specific costs and situational costs to identify the preferred shift path. The preferred shift path is executed to achieve the target powertrain state.
Claims19
A method for controlling a transmission of a powertrain system, the method comprising:
- executing a single source shortest path search to identify a preferred shift path originating with an initial powertrain state and terminating at a target powertrain state, said single source shortest path search employing transition-specific costs and situational costs to identify the preferred shift path, wherein the preferred shift path comprises a path from the initial powertrain state to the target powertrain state that minimizes total shift costs, said total shift costs comprising the transition-specific costs and the situational costs, wherein each transition-specific cost comprises a cost associated with elapsed time and power loss associated with executing a candidate transition to a powertrain state and wherein each situational cost comprises a penalty cost associated with discouraging executing selected ones of the candidate transitions, each candidate transition including a pre-calibrated, dedicated one of the transition-specific costs associated therewith that is independent of instantaneous operational parameters of the powertrain system;
- and
- executing, by a controller, the preferred shift path to achieve the target powertrain state.
A method for controlling a multi-mode transmission of a powertrain system, the method comprising:
- determining a transition-specific cost for each of a plurality of candidate transitions from an initial powertrain state to a target powertrain state;
- identifying a preferred shift path between the initial powertrain state and the target powertrain state including a plurality of sequentially executed transitions originating with the initial powertrain state and terminating at the target powertrain state by executing a single source shortest path search that employs the respective transition-specific costs and situational costs, wherein the preferred shift path comprises a path from the initial powertrain state to the target powertrain state that minimizes total shift costs, said total shift costs comprising the transition-specific costs and the situational costs, wherein each transition-specific cost comprises a cost associated with elapsed time and power loss associated with executing a candidate transition to a powertrain state and wherein each situational cost comprises a penalty cost associated with discouraging executing selected ones of the candidate transitions, each candidate transition including a pre-calibrated, dedicated one of the transition-specific costs associated therewith that is independent of instantaneous operational parameters of the powertrain system;
- and
- executing, by a controller, the preferred shift path between the initial powertrain state and the target powertrain state.
1 more element
A method for controlling a multi-mode transmission of a powertrain system, the method comprising:
- executing a single source shortest path search to identify a preferred shift path including a plurality of sequentially executed transitions originating with an initial powertrain state and terminating at a target powertrain state employing transition-specific costs and situational costs, wherein the preferred shift path comprises a path from the initial powertrain state to the target powertrain state that minimizes total shift costs, said total shift costs comprising the transition-specific costs and the situational costs, wherein each transition-specific cost comprises a cost associated with elapsed time and power loss associated with executing a candidate transition to a powertrain state and wherein each situational cost comprises a penalty cost associated with discouraging executing selected ones of the candidate transitions, each candidate transition including a pre-calibrated, dedicated one of the transition-specific costs associated therewith that is independent of instantaneous operational parameters of the powertrain system;
- and
- executing, by a controller, the preferred shift path between the initial powertrain state to the target powertrain state.
Dependencies are inferred from the claim text.