Electric Motorcycle Speed Control With Dual Sensor and Back-EMF
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Solution Overview
Problem
Regulations require at least two independent and distinct systems for vehicle speed acquisition in electrically powered motorcycles to ensure operation in case of failure, posing a design complexity and reliability challenge.
Innovation Solution
A control system combining physical and logic reading means, where physical sensors detect rotor or wheel position and a computing unit calculates speed based on counter-electromotive force, allowing for dual-speed acquisition systems that optimize motor control and meet type-approval standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent speed acquisition systems are provided to comply with regulations, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of two independent speed acquisition systems by having the first control unit perform both physical sensor-based speed measurement and logic-based counter-electromotive force calculation. This integration allows the system to comply with regulations requiring two independent speed reading systems while avoiding the complexity of implementing two completely separate physical systems, as both functions are consolidated within a single control unit.
2Measurement precision
If physical sensors are used for speed detection, then measurement precision is improved at low speeds, but device complexity increases
Solution Approach 1:
The control unit is designed to perform multiple functions: it processes signals from physical position sensors for accurate low-speed measurement, simultaneously calculates counter-electromotive force for high-speed operation, and generates control signals for the electric motor. This multi-functionality allows a single control unit to replace what would traditionally require separate dedicated systems for each measurement method.
3Reliability
If dual speed acquisition systems are implemented, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By consolidating both physical sensor processing and counter-electromotive force calculation within a single control unit, the patent reduces the number of separate components that would need to be manufactured and assembled. This merging approach maintains the reliability benefits of dual speed acquisition systems while reducing manufacturing complexity and cost compared to implementing two completely independent systems.
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
The dual-system approach enhances reliability and manufacturing efficiency while adhering to regulatory requirements, with physical sensors reliable at low speeds and logic calculations more reliable at high speeds, optimizing electric motor control.
Implementation Method 1
calculates the angular position of said rotor with respect to said stator on the basis of the counter-electromotive force produced by said electric motor
Data Source
AI summary
A control system for an electrically-actuated, rideable saddle vehicle including an electric traction motor and a vehicle control system having two different speed acquisition systems. A first speed system includes a position sensor and controls power to the motor on a basis of a control signal, which is characteristic of torque selectively required by the electric motor. A second speed system includes Logic circuitry for estimating vehicle speed from estimated variations of a counter-electromotive force generated in the stator winding as a result of the rotor movement of the motor. The two systems allow optimizing control of the motor from both speed systems, or from that considered more reliable in a given operating condition, during operation of the vehicle. Illustratively, for low speeds, speed control may be based on sensor signals in the first speed system, while high speeds control may be based on the estimates from the logic system.