EV Stability Torque 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 during sudden slope changes, as conventional torque control methods can lead to instability, such as front-wheel slip or insufficient driving force, due to delayed slope estimation and restrictive control measures that deteriorate overall performance.
Innovation Solution
A vehicle stability control method that determines sudden slope changes using navigation and ADAS information, allowing for real-time correction of stability control torque through a hybrid control unit, which adjusts torque limits and gains to compensate for pitching motions, thereby enhancing riding comfort and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional torque control methods are used during sudden slope changes, then the control system remains simple and responsive, but riding comfort deteriorates due to vehicle body instability and pitching motions
Solution Approach 1:
The system performs preliminary slope determination using navigation information and ADAS before the vehicle actually encounters the slope change. By predicting the upcoming slope change and preparing appropriate torque control strategies in advance, the system can smoothly transition into corrected torque control when the slope change occurs, thereby maintaining both responsiveness and stability during sudden slope transitions.
2Stability of the object's composition
If stability control torque is corrected for sudden slope changes, then riding comfort improves, but control complexity increases due to additional correction sections and torque adjustments
Solution Approach 1:
The control correction is segmented into specific correction sections based on the determined slope change points. The controller applies torque correction only within these defined correction sections rather than continuously, which limits the complexity to specific time intervals and spatial regions. This segmented approach allows the system to maintain simplicity in non-correction periods while providing enhanced stability when needed.
Solution Approach 2:
The torque control parameters are dynamically adjusted based on the determined correction section and actual vehicle state. The correction magnitude and duration are not fixed but adapt to the specific slope change characteristics and real-time vehicle conditions, allowing the system to optimize performance while avoiding unnecessary complexity in normal operating conditions.
3Loss of time
If slope determination is performed in advance using navigation and ADAS, then response time to slope changes improves, but system complexity increases due to integration of multiple sensing systems
Solution Approach 1:
The system leverages the multi-functionality of existing navigation and ADAS components, which already perform functions like road map matching, lane recognition, and environmental sensing. By reusing these existing sensors and processing capabilities for slope determination purposes, the system achieves early slope detection without requiring dedicated additional sensing hardware, thereby minimizing the increase in system complexity.
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.