Electric Motorcycle Motor Inverter Torque Control
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Solution Overview
Problem
Existing electric motorcycle propulsion systems face issues with current overload during operation and charging, leading to potential battery damage and user discomfort due to sudden current limitations or interruptions, which existing Battery Monitoring Systems (BMS) address only after detection and with abrupt measures.
Innovation Solution
A system that dynamically adjusts the torque value sent to the inverter based on real-time battery conditions, using a combination of inputs from the throttle, battery voltage, and calculated maximum current values to prevent overcurrent, allowing for smooth operation and charging by continuously monitoring and managing current and voltage within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BMS systems use sudden current limitations or interruptions to protect the battery, then battery protection is achieved, but user comfort and riding experience deteriorate
Solution Approach 1:
The system performs preliminary action by dynamically adjusting the torque value before overcurrent conditions occur. The control unit continuously monitors battery conditions and preemptively modifies the torque command to the inverter, preventing overcurrent from developing in the first place rather than reacting after detection. This eliminates the need for sudden current interruptions while maintaining battery protection.
Solution Approach 2:
The system applies dynamics by continuously and smoothly adjusting the torque value based on real-time battery conditions. Instead of fixed current limits or abrupt interruptions, the control unit dynamically modulates the torque parameter within safe operating ranges, allowing smooth transitions that maintain both battery protection and user comfort during acceleration and regenerative braking.
2Power
If the inverter delivers high current to the electric motor, then power output is improved, but battery damage risk increases
Solution Approach 1:
The system implements feedback by continuously monitoring battery conditions (voltage, temperature, charge level) and using this information to dynamically adjust the torque value. The control unit receives feedback from the battery management system and modifies the inverter's current output accordingly, ensuring high power delivery when safe and current limitation when battery conditions require protection, thus eliminating the need for fixed conservative current limits.
3Reliability
If the battery charging current is limited to prevent overcurrent, then battery protection is achieved, but charging efficiency deteriorates
Solution Approach 1:
During regenerative braking, the system dynamically adjusts the torque value to optimize charging current within safe battery limits. Instead of applying fixed conservative current limits that reduce charging efficiency, the control unit continuously adapts the torque parameter based on real-time battery conditions, allowing maximum safe charging current to be recovered during deceleration while preventing overcurrent damage.
Data Source
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AI summary
The system (1) for piloting an electric motor in electric motorcycles or the like is operatively connectable to a control inverter (I) of an electric motor (E) of an electric motorcycle (M) and to a control device (C) of the acceleration of the electric motorcycle (M) and comprises dynamic generation means (10) of a piloting signal (TOUT) of the inverter (I) according to a control signal (G) coming from the control device (C) and to at least a maximum deliverable/absorbable current value (IMAX, RIMAX) by an electric battery (B) of the electric motorcycle (M).