Hybrid Powertrain Motor-Generator-Inverter Efficiency Threshold Control
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Solution Overview
Problem
Hybrid electric vehicles face inefficiencies in operating modes due to the lack of precise control over the motor-generator-inverter's efficiency thresholds, leading to suboptimal performance in boost and regenerative operating modes.
Innovation Solution
A method using a hybrid system controller to selectively operate the motor-generator-inverter in boost or regenerative modes based on calculated efficiency thresholds, ensuring the motor-generator-inverter operates only when its efficiency meets or exceeds defined upper and lower MGI efficiency thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the motor-generator-inverter operates without efficiency threshold control, then the system can operate in any operating mode, but the overall efficiency of the hybrid powertrain deteriorates due to suboptimal performance
Solution Approach 1:
The patent applies parameter changes by establishing specific efficiency threshold values for the motor-generator-inverter. The hybrid system controller calculates operating efficiency and compares it against predefined upper and lower thresholds to determine whether to enable boost or regenerative operating modes. This parameter-based control ensures the MGI operates only within efficient ranges, directly improving energy utilization without requiring complex mechanical modifications.
Solution Approach 2:
The patent implements feedback control through the hybrid system controller, which continuously monitors the operating efficiency of the motor-generator-inverter and adjusts operating modes accordingly. The controller receives efficiency data, compares it against thresholds, and provides feedback signals to enable or disable specific operating modes. This closed-loop feedback mechanism optimizes energy efficiency while maintaining manageable system complexity through electronic control.
2Power
If the motor-generator-inverter operates in boost mode without efficiency thresholds, then tractive power is increased, but fuel consumption increases due to suboptimal efficiency operation
Solution Approach 1:
The patent applies parameter changes by setting an upper efficiency threshold specifically for boost operating mode. The hybrid system controller calculates the operating efficiency and only enables boost mode when efficiency meets or exceeds this threshold. This ensures that tractive power assistance is provided only when the motor-generator-inverter operates efficiently, preventing excessive fuel consumption while maintaining the ability to deliver required tractive power when conditions are favorable.
3Loss of energy
If the motor-generator-inverter operates in regenerative mode without efficiency thresholds, then energy recovery is maximized, but operating reliability deteriorates due to operation in inefficient ranges
Solution Approach 1:
The patent applies parameter changes by establishing a lower efficiency threshold for regenerative operating mode. The hybrid system controller calculates operating efficiency and only enables regenerative mode when efficiency meets or exceeds this threshold. This parameter-based control ensures that energy recovery operations occur only within reliable and efficient operating ranges, preventing damage from inefficient operation while still capturing available regenerative energy opportunities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the overall efficiency of the hybrid powertrain by ensuring the motor-generator-inverter operates in optimal modes, improving energy utilization and reducing fuel consumption and emissions.
Implementation Method 1
The motor-generator-inverter draws electrical power from the at least one energy storage device for generating torque for the internal combustion engine when operating in the boost operating mode
Implementation Method 2
The motor-generator-inverter receives torque from the internal combustion engine for generating electricity for charging the at least one energy storage device when operating in the regenerative operating mode
Data Source
AI summary
A method of controlling a powertrain of a hybrid vehicle includes comparing an operating efficiency of a motor-generator-inverter to an upper MGI efficiency threshold when a boost operating mode is selected. When the operating efficiency of the motor-generator-inverter is equal to or greater than the upper MGI efficiency threshold, the motor-generator-inverter is controlled to operate in the boost operating mode. The operating efficiency of the motor-generator-inverter is compared to a lower MGI efficiency threshold when a regenerative operating mode is selected. When the operating efficiency of the motor-generator-inverter is equal to or greater than the lower MGI efficiency threshold, the motor-generator-inverter is controlled to operate in the regenerative operating mode.