Synchronized Torque Pulsing in Dual-Motor Electric Drives
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Solution Overview
Problem
Operating two electric machines in an electric drive system increases losses, reducing the vehicle's driving range and generating undesirable noise and vibration.
Innovation Solution
Implementing synchronized pulsed torque commands for the two electric machines based on a loss profile to reduce losses and maintain lower noise and vibration levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two electric machines are operated simultaneously to increase vehicle driving dynamics and performance, then vehicle performance is improved, but losses increase and driving range is reduced
Solution Approach 1:
The patent applies periodic action by implementing synchronized pulsed torque commands that periodically deactivate the second electric machine during specific operating conditions. Instead of continuously operating both machines, the system uses periodic on/off cycling of the second machine based on torque thresholds and operating parameters, thereby reducing energy losses while maintaining vehicle performance when needed.
2Power
If two electric machines are operated simultaneously to increase vehicle driving dynamics and performance, then vehicle performance is improved, but noise and vibration increase
Solution Approach 1:
The system uses periodic action by implementing synchronized pulsed torque commands that periodically deactivate the second electric machine during specific operating conditions. Instead of continuously operating both machines, the system uses periodic on/off cycling of the second machine based on torque thresholds and operating parameters, thereby reducing energy losses while maintaining vehicle performance when needed.
Solution Approach 2:
The patent applies merging by coordinating the operation of two electric machines to work in unison during specific operating conditions. The controller synchronizes the torque output of both machines and manages their coordinated activation/deactivation, allowing them to function as a unified system that delivers performance while minimizing noise and vibration through synchronized operation.
Data Source
AI summary
Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies synchronized pulsed torque commands that vary in magnitude and/or phase as a function of time when a driver of a vehicle requests a constant driver demand torque.