Hybrid Transmission Torque Control Iterative Constraint Selection
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Solution Overview
Problem
Existing hybrid transmission systems face challenges in efficiently managing torque distribution and power transfer between multiple torque-generative devices and an energy storage device, particularly in fixed gear operating range states, which affects overall system efficiency and performance.
Innovation Solution
A method for controlling the hybrid transmission that determines output torque commands, motor torque constraints, power constraints, and iteratively selects candidate input torques to achieve the commanded output torque while satisfying motor and energy storage device constraints, optimizing torque distribution and power transfer within fixed gear operating range states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If iterative selection of candidate input torques is performed to satisfy multiple constraints, then torque distribution optimization is improved, but computational complexity increases
Solution Approach 1:
The control method segments the torque management problem into distinct constraint evaluations (motor torque constraints, power constraints, efficiency constraints) that are checked iteratively against candidate input torques. This segmentation allows systematic optimization without requiring a monolithic complex control structure.
Solution Approach 2:
The control system dynamically adjusts the selection of candidate input torques based on real-time evaluation of multiple constraints. The iterative process allows the system to adaptively find optimal torque distribution solutions as operating conditions change, rather than using fixed control parameters.
2Power
If multiple torque machines and energy storage device are coordinated, then power management is improved, but control complexity increases
Solution Approach 1:
The control method merges the coordination of multiple torque machines (internal combustion engine and electric motor) and the energy storage device into a unified control framework. By evaluating candidate input torques against combined constraints from all power sources and the energy storage device, the system achieves integrated power management.
Solution Approach 2:
The control system performs multiple functions through a single iterative evaluation process: it manages torque distribution among power sources, monitors energy storage device constraints, evaluates efficiency requirements, and determines optimal operating points. This multi-functional approach reduces the need for separate control systems for each function.
Data Source
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AI summary
A hybrid transmission (10) is operative to transfer power between an input member (12) and first and second torque machines (56,72) and an output member (64) in a fixed gear operating range state. The first and second torque machines (56,72) are connected to an energy storage device (74). A method for controlling the hybrid transmission (10) includes determining an output torque command at the output member (64), determining motor torque constraints for the first and second torque machines (56,72) and determining power constraints for the energy storage device (74), iteratively selecting candidate input torques transferable to the input member (12) and associated output torques, determining a second torque constraint associated with the candidate input torque, determining a third torque constraint associated with the candidate input torque, and determining a preferred input torque comprising the candidate input torque that achieves the commanded output torque at the output member (64) and satisfies the motor torque constraints for the first and second torque machines (72), satisfies the power constraints for the energy storage device (74), and satisfies the second and third torque constraints associated with the candidate input torque when operating in the fixed gear operating range state.