Vehicle Position Detection Using Skid-Corrected Wheel Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle position detection systems inaccurately calculate vehicle position when wheels skid, as they rely solely on wheel speed, leading to reduced accuracy.
Innovation Solution
A vehicle position detecting device that includes a wheel speed acquisition unit, a skid detection unit, a vehicle body speed calculation unit, and a position calculation unit, which corrects vehicle body speed based on skid detection and correction information, and uses GPS signals to accurately calculate vehicle position even during skidding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wheel speed is used to calculate vehicle position, then the calculation is simple, but the accuracy is reduced when wheels skid
Solution Approach 1:
The patent introduces a skid detection unit as an intermediary component that monitors wheel skid conditions and triggers correction mechanisms. This mediator detects skid events through sensor data (wheel speed discrepancies, motor current, steering angle) and activates correction algorithms, thereby maintaining position accuracy without requiring complete redesign of the calculation system.
Solution Approach 2:
The system dynamically changes calculation parameters based on detected skid conditions. When skid is detected, the system switches from standard wheel-speed-based calculation to corrected calculation methods that incorporate skid correction values, GPS data, or alternative sensor inputs, thereby adapting the calculation approach to maintain accuracy under varying conditions.
2Measurement precision
If skid correction is implemented, then vehicle position accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the position detection system into distinct functional modules: wheel speed acquisition unit, skid detection unit, vehicle body speed calculation unit, and position calculation unit. Each module handles a specific aspect of the detection process, allowing for independent optimization and maintenance while working together to achieve accurate position detection even during skid events.
Solution Approach 2:
The skid detection unit serves multiple functions: it detects skid conditions through various sensors, determines correction values, and triggers appropriate correction algorithms. This multi-functional design reduces overall system complexity by consolidating detection and correction logic into a single versatile component rather than requiring separate systems for each function.
3Measurement precision
If multiple correction methods are used (wheel speed correction and GPS correction), then position accuracy is improved, but the system becomes more complex
Solution Approach 1:
The patent implements dynamic correction methodology where the system automatically selects and switches between different correction approaches based on real-time conditions. When GPS signals are available and reliable, GPS-based correction is applied; when GPS is unavailable or unreliable, wheel speed-based correction with skid compensation is used. This dynamic adaptation maintains high accuracy without requiring permanent integration of all possible correction systems.
Data Source
AI summary
A vehicle position detecting device includes an ECU that acquires a wheel speed of a wheel of a vehicle corresponding to rotation of the wheel, detects a skid of the wheel, calculates, when the skid is not detected, a vehicle body speed corresponding to the speed of a vehicle body of the vehicle based on the wheel speed, and corrects, in response to detection of the skid, the wheel speed based on correction information and calculates the vehicle body speed based on the corrected wheel speed. The ECU further calculates the position of the vehicle based on the vehicle body speed depending on the presence of the skid.