Hybrid Powertrain Torque Split Control Using Transmission Efficiency
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Solution Overview
Problem
Existing hybrid powertrain control methods fail to optimize fuel efficiency and emissions by not adequately considering the efficiency of the transmission and vehicle operating conditions.
Innovation Solution
A control method that acquires data on engine, electrical machine, and transmission efficiencies, and processes these with vehicle operating conditions to dynamically distribute torque, using a penalty factor to adjust the cost of electrical energy based on battery charge, optimizing torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional hybrid powertrain control methods are used, then the system operates with standard energy management strategies, but fuel savings are insufficient and emissions are not optimally reduced
Solution Approach 1:
The patent implements dynamic control strategies that continuously adapt torque distribution between the internal combustion engine and electrical machine based on real-time operating conditions. The control unit dynamically adjusts the equivalence factor λ and state of charge SOC to optimize energy management, transitioning from static to dynamic control to improve fuel efficiency and reduce emissions.
Solution Approach 2:
The patent changes key operational parameters including the equivalence factor λ (which balances fuel consumption and electrical energy consumption), state of charge SOC (battery charge level), and torque distribution ratios. By dynamically adjusting these parameters based on vehicle operating conditions, the system optimizes the balance between thermal and electrical traction to minimize overall energy consumption.
2Loss of energy
If dynamic torque distribution and penalty factors are implemented, then fuel efficiency improves and emissions reduce, but control system complexity increases
Solution Approach 1:
The patent implements feedback control mechanisms where the control unit continuously monitors vehicle operating conditions, battery state of charge, and torque requirements. Based on this feedback, the system dynamically adjusts the equivalence factor λ and torque distribution to optimize fuel efficiency. The feedback loop ensures the system adapts to changing conditions while maintaining optimal performance.
Solution Approach 2:
The patent introduces an equivalence factor λ as an intermediary parameter that mediates between fuel consumption and electrical energy consumption. This factor acts as a weighting coefficient that balances the two energy sources, simplifying the complex optimization problem into a manageable control parameter that can be adjusted based on operating conditions without requiring overly complex control algorithms.
Data Source
AI summary
A control method of a hybrid powertrain for a vehicle having an internal combustion engine, an electrical machine connected to a crankshaft of the internal combustion engine via a transmission and a control unit are disclosed. The method includes acquisitioning first data representative of the efficiency of the internal combustion engine, of the electrical machine and of the transmission, acquisitioning second data representative of operating conditions of the vehicle, and processing the data, which includes calculating a distribution of the torque between the internal combustion engine and the electrical machine.