Electric Vehicle Carrier Frequency Control for Shift Feedback
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Solution Overview
Problem
There is a need to enhance the production value of electric vehicles by improving control systems that effectively manage the driving force and electromagnetic noise generated by electric vehicle motors, particularly in response to driver shift operations.
Innovation Solution
A vehicle control apparatus that includes a traveling controller with a carrier frequency setting unit, which adjusts the carrier frequency based on the speed ratio set through driver shift operations and the revolution number of the motor, allowing for variation in electromagnetic noise to enhance the driver's experience and improve vehicle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carrier frequency is kept constant for motor control, then the control system is simple, but the driver cannot perceive shift operations and electromagnetic noise remains unoptimized
Solution Approach 1:
The patent applies dynamics by making the carrier frequency variable rather than fixed. The traveling controller dynamically adjusts the carrier frequency based on the speed ratio determined through shift operations, allowing the system to adapt to different driving conditions and enable the driver to perceive shift operations through varying electromagnetic noise characteristics.
Solution Approach 2:
The patent changes the parameter of carrier frequency from a constant value to a variable parameter that changes with speed ratio. By modifying this electrical parameter in response to shift operations, the system enhances driver perception without requiring additional mechanical or sensory components.
2Reliability
If the carrier frequency is adjusted dynamically, then driver feedback and vehicle control are enhanced, but the control system becomes more complex
Solution Approach 1:
The traveling controller performs multiple functions: it controls motor driving force and simultaneously adjusts carrier frequency based on speed ratio. This multi-functionality allows the system to enhance driver feedback and control responsiveness without adding separate dedicated components for frequency adjustment.
Solution Approach 2:
The system implements feedback by using the speed ratio information from shift operations to adjust the carrier frequency. This closed-loop approach ensures that the electromagnetic noise characteristics provide meaningful feedback to the driver about the vehicle's operating state while maintaining reliable control.
Data Source
AI summary
A vehicle control apparatus for an electric vehicle including a battery and a motor includes a traveling controller. The traveling controller drives the motor on the basis of a carrier frequency to control a driving force of the electric vehicle and to cause the electric vehicle to travel, and changes the carrier frequency on the basis of a speed ratio set through a shift operation performed by a driver of the electric vehicle.