Geofenced Drive Mode Switching on Low-Slip Road Segments
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Solution Overview
Problem
When transitioning from internal combustion engine power to motor power in geofencing zones, vehicles are prone to slipping on slippery road surfaces, particularly during rainy weather, due to the change in torque.
Innovation Solution
A vehicle control system that switches the drive mode to motor power at a position outside the geofencing zone where the road surface has a low probability of slipping, using road surface information such as rainfall and road alignment to determine safe switching points, thereby minimizing the risk of vehicle slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive mode is switched from internal combustion engine to motor at the perimeter of the geofencing zone, then the vehicle can comply with environmental restrictions, but the vehicle may slip on slippery road surfaces due to torque change
Solution Approach 1:
The system performs preliminary assessment of road surface conditions before the vehicle reaches the geofencing zone perimeter. When slippery conditions are detected, the control device switches the drive mode from internal combustion engine to motor in advance, at a position where the road surface is dry or has low slip probability, thereby avoiding torque-induced slipping at the critical switching point.
Solution Approach 2:
The system continuously monitors road surface information (rainfall amount, wiper operation count, road alignment) and uses this feedback to dynamically determine the optimal drive mode switching position. Based on the feedback from road condition assessment, the control device adjusts the switching location to ensure it occurs on a road surface with low slip probability, thus preventing vehicle slipping while maintaining compliance.
2Device complexity
If the drive mode switching position is determined without considering road surface conditions, then the control system is simple, but the vehicle slips on rainy road surfaces
Solution Approach 1:
The vehicle's existing sensors (rainfall sensors, wiper operation counters, road alignment detection devices) are utilized to assess road surface conditions. The control device integrates this self-collected information with geofencing zone data to autonomously determine the optimal drive mode switching position, eliminating the need for external complex control systems while effectively preventing vehicle slip.
3Object-affected harmful factors
If the drive mode is switched to motor power outside the geofencing zone on slippery road surfaces, then vehicle slip is prevented, but the vehicle may not comply with geofencing restrictions
Solution Approach 1:
The system applies different control strategies based on local road surface conditions. When the road surface is assessed as having high slip probability, the drive mode switching is performed at a specific location outside the geofencing zone where conditions are safer. When road conditions are favorable, normal switching at the perimeter is maintained, ensuring both slip prevention and geofencing compliance through location-specific control.
Data Source
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AI summary
A vehicle control device configured to control switching of drive mode of a vehicle (3; 3A) including an internal combustion engine and a motor (11) includes a processor configured to switch, in a case where a road surface of a perimeter of a geofencing zone is a road surface on which there is a high probability that the vehicle (3; 3A) slips, in a movement route from an outside of the geofencing zone to an inside of the geofencing zone, the drive mode of the vehicle (3; 3A) to drive by the motor (11) in a state in which there is a low probability that the vehicle (3; 3A) slips, outside the geofencing zone.