Improve low-load operation
The project addressed the low-efficiency operating region of an electric propulsion system at low torque. The question was whether control software could improve cycle performance without a hardware change.
Modulate torque while preserving the average
Dynamic Motor Drive (DMD) alternates a low torque request between a higher-efficiency torque level and zero torque. The average of the pulsating request is kept equal to the driver’s demand. Drivability remains a necessary part of evaluating this strategy.
A specific vehicle and axle configuration
Work with drivetrain specialist BorgWarner on a Li Auto L9 range-extended SUV, with interior permanent magnet motors on both axles. Applied DMD to the rear axle only.
Reported CLTC result: 0.6%
A 0.6% vehicle-range increase in a chassis-roll test under the China Light-Duty Vehicle Test Cycle (CLTC), with DMD on the rear axle only.
Inside the work.
Explore the source material.
Video link supplied in the company document; not independently reviewed for technical performance.
Project description and outcomes are self-reported in the supplied company document. Linked video material is provided as a source reference, not independent verification or a customer endorsement.
Connected expertise.
Vehicle-level control calibration · supplied document
Motor-control calibration at vehicle level.
Use vehicle measurements and control-software calibration to investigate drivability, vibration and cycle energy consumption.
Explore →
Inverter loss map · supplied document
Bring semiconductor losses into the drive model.
Extract device loss characteristics from datasheets and incorporate inverter losses into propulsion-system simulation.
Explore →Bring us your challenge.
Start with your application, constraints and the decision you need to make.