EV Motor Sensor Deviation Measurement Order Switching
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Solution Overview
Problem
Electric vehicles with two traveling motors face challenges in efficiently measuring deviations of original positions of rotational position sensors due to differences in specifications and speed reducing ratios, leading to inefficiencies in calibration and torque control.
Innovation Solution
The implementation of a measurement controller that switches the measurement order of deviations for the first and second rotational position sensors based on traveling data on acceleration or deceleration, utilizing distinct wheel-speed ranges for each sensor to optimize measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the measurement of deviation for both rotational position sensors is executed simultaneously, then the calibration process is completed faster, but the measurement accuracy deteriorates because the wheel-speed ranges for the two sensors are different and cannot be satisfied at the same time
Solution Approach 1:
The patent applies dynamics by making the measurement execution order flexible and adaptable to real-time vehicle operating conditions. The measurement controller dynamically switches between measuring deviation of the first rotational position sensor and the second rotational position sensor based on whether the vehicle is accelerating or decelerating, allowing the system to adapt to changing wheel-speed ranges while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the measurement execution parameter (which sensor to measure) based on the vehicle's acceleration or deceleration state. By switching the measurement target according to wheel-speed range conditions, the system ensures that each sensor is measured when its specific wheel-speed range is satisfied, thereby maintaining measurement accuracy without requiring simultaneous measurement.
2Device complexity
If the measurement order is fixed for both rotational position sensors, then the control logic is simpler, but the measurement efficiency deteriorates because the fixed order cannot adapt to different wheel-speed ranges under acceleration or deceleration
Solution Approach 1:
The patent makes the measurement execution order dynamic by switching between sensors based on vehicle acceleration or deceleration detection. This dynamic adjustment allows the system to adapt to different wheel-speed ranges in real-time, significantly improving measurement efficiency without introducing excessive complexity, as the switching logic is triggered by simple acceleration/deceleration detection.
Solution Approach 2:
The patent implements feedback by continuously monitoring the vehicle's acceleration or deceleration state and using this information to determine the next measurement target. The measurement controller receives feedback about the current operating condition and adjusts the measurement sequence accordingly, ensuring optimal measurement efficiency while maintaining manageable control logic.
3Device complexity
If the wheel-speed ranges for both rotational position sensors are made identical, then the measurement process is simplified, but the adaptability deteriorates because the different sensor specifications and speed reducing ratios cannot be accommodated
Solution Approach 1:
The patent segments the measurement process into separate measurement routines for the first and second rotational position sensors, each with its own dedicated wheel-speed range. This segmentation allows each sensor to be measured under its optimal conditions without interfering with the other, accommodating different sensor specifications and speed reducing ratios while keeping each measurement process relatively simple.
Solution Approach 2:
The patent applies local quality by assigning different wheel-speed ranges to different sensors based on their specific characteristics. The first rotational position sensor operates with its own optimized wheel-speed range while the second sensor has a different optimized range, allowing each sensor to be measured under conditions tailored to its specific specifications and reducing ratio.
Data Source
AI summary
An electric vehicle includes first and second traveling motors, first and second rotational position sensors, and a measurement controller. The first rotational position sensor detects a rotation angle of the first traveling motor and has a first wheel-speed range in which a deviation of an original position of the first rotational position sensor is measurable. The second rotational position sensor detects a rotation angle of the second traveling motor and has a second wheel-speed range in which a deviation of an original position of the second rotational position sensor is measurable. The second wheel-speed range differs from the first wheel-speed range. The measurement controller executes, in an execution order, measurements of the deviations of the original positions of the first and second rotational position sensors while the electric vehicle is traveling, and switch the execution order on the basis of acceleration or deceleration data of the electric vehicle.