Electric Motor Stability Control for Sudden Road Slope Changes
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Solution Overview
Problem
Existing vehicle systems with electric motors face challenges in maintaining riding comfort and stability when encountering sudden changes in road slope, as conventional torque control methods can lead to issues like wheel slip or insufficient driving force, and current slope estimation methods are delayed due to noise and filtering, deteriorating overall control performance.
Innovation Solution
A vehicle stability control method that determines sudden slope changes using navigation and ADAS information, adjusts stability control torque by applying corrections through an electric motor's torque control, minimizing filtering delays and enhancing control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional torque control methods are used on uneven roads, then riding comfort can be improved by compensating for vehicle body motion, but wheel slip or insufficient driving force occurs when encountering sudden slope changes
Solution Approach 1:
The system determines the slope of the road ahead in advance using navigation information and ADAS before the vehicle actually encounters the slope change. By predicting the upcoming slope condition and determining a correction section ahead of time, the controller can prepare appropriate torque adjustments, preventing wheel slip and ensuring sufficient driving force when the vehicle reaches the sudden slope change point.
Solution Approach 2:
The system continuously monitors road conditions through ADAS and navigation data, and adjusts the motor torque based on the determined slope and correction section. This closed-loop control ensures that torque compensation is applied precisely when needed to maintain both riding comfort and prevent wheel slip during sudden slope changes.
2Measurement precision
If slope estimation uses traditional filtering methods, then noise can be reduced, but control performance deteriorates due to delays in detecting sudden slope changes
Solution Approach 1:
Instead of relying on delayed filtered slope estimation from sensors, the system determines the slope of the road ahead in advance using navigation information and ADAS data. This preliminary determination of upcoming slope conditions allows the system to prepare torque corrections before the vehicle encounters the actual slope change, eliminating detection delays while maintaining accuracy.
Solution Approach 2:
The system uses navigation information and ADAS as intermediary data sources to determine road slope ahead, rather than relying directly on filtered sensor data. This intermediary approach provides timely and accurate slope information without the delays inherent in traditional filtering methods, enabling responsive torque control.
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 method improves riding comfort and stability by rapidly recognizing slope changes and adjusting torque, preventing wheel slip and ensuring sufficient driving force, thus enhancing the overall control performance and commercial value of vehicles.
Implementation Method 1
a vehicle equipped with an electric motor... control of the torque of the electric motor
Data Source
AI summary
A method of controlling stability of a motorized vehicle having an electric motor as a drive source includes determining a slope of a road ahead, when sensing a sudden slope change point as a result of determination, determining a correction section based on the sudden slope change point, and correcting stability control torque in the correction section to compensate for motion of the vehicle body due to a change in the slope of the road using a pitching motion of the vehicle body caused by the torque of the electric motor.