Adaptive Reverse Speed Control Based on Rear Object Detection
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Solution Overview
Problem
Many electric vehicles equipped with single-speed transmissions are limited in reverse speed, restricting their ability to operate at high speeds when reversing, especially in emergency situations or when no objects are detected behind the vehicle.
Innovation Solution
A method and system where a controller operates an electric machine to limit the maximum reverse speed of an electric vehicle based on detected objects behind the vehicle and location, allowing higher speeds when a siren is activated, such as in emergency vehicle scenarios, by disabling or lessening the reverse speed limiter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reverse speed limiter is equipped in electric vehicles, then safety is improved by preventing excessive reverse speeds, but the vehicle's ability to operate at high speeds in reverse is restricted
Solution Approach 1:
The reverse speed limiter is made dynamic by adjusting the maximum reverse speed threshold based on real-time detection of objects behind the vehicle. When no objects are detected, the system allows higher reverse speeds; when objects are detected, the system reduces the speed limit. This dynamic adjustment resolves the contradiction by making the safety constraint adaptive rather than fixed.
Solution Approach 2:
The system changes the speed parameter dynamically based on environmental conditions. The controller modifies the maximum reverse speed parameter according to the number of detected objects, transitioning between different speed thresholds. This parameter change approach allows the vehicle to operate at high speeds when safe and enforce speed limits when necessary.
2Adaptability or versatility
If the reverse speed limiter is disabled to allow high reverse speeds, then operational flexibility is improved, but safety risks increase when objects are present behind the vehicle
Solution Approach 1:
The system implements feedback by continuously monitoring the environment behind the vehicle using sensors. The detection results are fed back to the controller, which adjusts the reverse speed limit accordingly. This closed-loop feedback mechanism provides operational flexibility while maintaining safety through real-time environmental awareness.
Solution Approach 2:
The vehicle's own sensor system and controller work together to automatically adjust the reverse speed limit without external intervention. The system serves itself by using its built-in detection capabilities to make real-time decisions about speed limits, eliminating the need for manual disengagement of the speed limiter.
3Reliability
If a fixed reverse speed limit is applied, then safety is ensured under all conditions, but the vehicle cannot operate at high speeds in emergency situations or when no objects are detected
Solution Approach 1:
The fixed speed limit is transformed into a dynamic threshold that adapts to operational conditions. The system maintains safety by enforcing speed limits when objects are detected but allows high-speed operation when the environment is clear, thus resolving the contradiction between consistent safety and operational efficiency.
Solution Approach 2:
The speed limit parameter is changed dynamically based on the operational context. The controller adjusts the maximum reverse speed parameter according to the number of detected objects, allowing the system to optimize both safety and productivity by matching the speed limit to the actual operational requirements.
Data Source
AI summary
A vehicle includes an electric machine that generates torque to move wheels of the vehicle, and a controller. The controller operates the electric machine to limit a maximum speed at which the vehicle is driven in reverse such that the maximum speed depends on a number of detected objects behind the vehicle.