Electric Vehicle Motor Torque Control for Virtual Gear Shifting
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Solution Overview
Problem
Electric vehicles face challenges in enhancing acceleration performance and drivability due to limited torque capacity of motors, which leads to excessive heating of powertrain components and potential vehicle fires, and existing boost strategies deteriorate drivability by alternately requiring boosting and normal operations.
Innovation Solution
A boost application control strategy that generates a motor torque command using a basic torque command and a virtual gear-shift intervention torque to simulate real gear shifting, allowing for instantaneous torque boosts within allowable limits, thereby improving drivability and acceleration performance while maintaining component durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum capacity of PE components is increased to improve acceleration performance, then torque capacity is improved, but PE components are excessively heated leading to vehicle fire risk
Solution Approach 1:
The control strategy performs preliminary assessment of PE component temperatures and thermal conditions before initiating boost operation. The controller determines whether boost control can be applied by evaluating current thermal states, and only allows torque exceeding allowable torque when thermal conditions are favorable, preventing excessive heating while enabling acceleration performance improvement
2Power
If boosting is maximally performed to improve acceleration, then torque output is increased, but drivability deteriorates due to frequent alternation between boosting and normal operation
Solution Approach 1:
The control strategy dynamically adjusts torque commands based on real-time driving conditions, vehicle state, and thermal conditions. Rather than fixed alternation between boost and normal modes, the controller continuously optimizes torque output to maintain smooth acceleration characteristics while preventing PE component overheating, thereby improving drivability without sacrificing acceleration performance
Solution Approach 2:
The controller continuously monitors PE component temperatures, motor torque, and vehicle operating conditions, using this feedback to determine appropriate torque commands. The boost application strategy adjusts torque output based on real-time thermal feedback and driving conditions, preventing excessive heating while maintaining acceptable drivability through continuous adaptation rather than fixed alternation
Data Source
AI summary
A method of controlling traveling of an electric vehicle is provided. The method includes generating a motor torque command using a basic torque command and a virtual gear-shift intervention torque for generating a feeling of real gear shifting, while an electric vehicle travels. A motor is operated for driving the electric vehicle according to the generated motor torque command to generate the feeling thereof. Ingenerating the feeling thereof, during at least a portion of time during which the feeling thereof is generated, boost control of the motor operation is performed such that a motor torque exceeding an allowable torque of the motor is generated, and thus the generation of the feeling thereof and the boost control are performed in conjunction with each other.