Hybrid Powertrain Control for Upshifting Energy Efficiency
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Solution Overview
Problem
Existing hybrid vehicle power train control methods fail to optimize energy efficiency during upshifting, as they do not effectively determine the optimal intervention torques for the drive motor and hybrid starter generator (HSG) to maximize energy collection and maintain engine efficiency.
Innovation Solution
A control method and system that determines whether the engine is at an optimal operating point, adjusts intervention torques of the drive motor and HSG to achieve maximum energy collection, and corrects intervention amounts to ensure optimal engine operation, thereby optimizing energy efficiency during upshifting by maximizing the energy-collect rate and ensuring the engine operates at its optimal torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If intervention torque is applied to the engine during upshifting, then the upshifting process can be completed, but the engine may deviate from the optimal operating point reducing energy efficiency
Solution Approach 1:
The system dynamically adjusts the intervention torque parameters of the drive motor and HSG based on real-time engine operating conditions. By changing the torque distribution parameters during upshifting, the system ensures the engine remains at or returns to the optimal operating point while completing the gear shift, thus resolving the contradiction between ease of operation and energy efficiency.
Solution Approach 2:
The controller continuously monitors engine operating parameters and uses feedback to adjust the intervention torque applied during upshifting. When the engine deviates from the optimal operating point, the system modifies the torque distribution between drive motor and HSG to bring the engine back to the optimal state, ensuring energy efficiency is maintained throughout the upshifting process.
2Productivity
If the drive motor and HSG operate at maximum intervention torques, then energy collection rate is maximized, but the total intervention torque may exceed the demanded intervention amount
Solution Approach 1:
The system allows the drive motor and HSG to operate at maximum intervention torques temporarily during upshifting, even if the total exceeds the demanded intervention amount. This partial excessive action ensures maximum energy collection rate is achieved, and the controller manages the torque distribution to complete the upshifting process effectively, accepting some torque overshoot as a trade-off for maximizing energy recovery.
Solution Approach 2:
The system dynamically changes the torque distribution parameters between drive motor and HSG to optimize energy collection. By adjusting the proportion of torque contributed by each component, the system maximizes the energy collection rate while managing the total intervention torque to be appropriate for the upshifting demand, resolving the contradiction between productivity and quantity control.
3Ease of operation
If the engine operates away from the optimal operating point during upshifting, then intervention torque can be applied, but fuel efficiency and energy collection efficiency are reduced
Solution Approach 1:
The system prepares the drive motor and HSG to provide intervention torque in advance during upshifting operations. By pre-positioning the electric components to deliver the required torque, the engine can maintain or quickly return to the optimal operating point, preventing energy efficiency loss while ensuring intervention capability is available when needed.
Solution Approach 2:
The drive motor and HSG act as intermediary components that provide the necessary intervention torque during upshifting, allowing the engine to remain at or return to the optimal operating point. These electric components mediate between the transmission system and the engine, enabling upshifting without forcing the engine away from its optimal efficiency region, thus resolving the contradiction between intervention capability and energy collection efficiency.
Data Source
AI summary
A control method of a power train for a hybrid vehicle is provided. The method includes determining whether an engine corresponds to an optimal operating point when intervention for upshifting is demanded during an HEV driving mode and determining whether an amount of demanded intervention is equal to or less than a value adding maximum intervention torques of a drive motor and an HSG. Each intervention torque of the drive motor and the HSG is determined to adjust a whole energy-collect rate by the drive motor and the HSG to a maximum value of the amount of demanded intervention, and simultaneously, the value adding the intervention torques of the drive motor and the HSG satisfies the amount of demanded intervention.