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
The supplied description says 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
The document reports work with drivetrain specialist BorgWarner on a Li Auto L9 range-extended SUV, with interior permanent magnet motors on both axles. The cited test applied DMD to the rear axle only. These names identify the supplied project context, not an endorsement of this consultancy.
Reported CLTC result: 0.6%
The source reports 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. This is a self-reported, configuration-specific result; it is not a general efficiency claim or a prediction for other vehicles and cycles.
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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.
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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.
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