Speed Control Device Using Dual Sensor Fusion for Slip Detection
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Solution Overview
Problem
Conventional speed control devices inaccurately detect speed and location during wheel slip or slide events, as they replace all speed data with maximum speed, leading to decreased detection accuracy.
Innovation Solution
A speed control device comprising a first calculation unit, a second calculation unit, a route database storage unit, and a selection unit that calculates and selects location and speed information from both units based on vehicle location, using a speed generator and a speed sensor that detects speed without wheel rotation, to determine accurate speed and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all speed data are replaced with maximum speed when wheel slip is detected, then wheel slip detection is simplified, but speed detection accuracy decreases
Solution Approach 1:
The patent segments the speed data processing into different time periods: before wheel slip, during wheel slip, and after wheel slip. By dividing the processing into these segments, the system can apply different handling rules to different data segments, preserving accurate speed data while identifying wheel slip events.
Solution Approach 2:
The patent applies local quality by treating speed data differently based on its temporal context. Speed data obtained during wheel slip is marked as unreliable, while data before and after wheel slip is preserved as reliable. This localized treatment maintains overall data accuracy while enabling wheel slip detection.
2Reliability
If speed data are replaced with maximum speed during wheel slip, then wheel slip events can be identified, but location detection accuracy decreases
Solution Approach 1:
The patent segments location data processing similar to speed data, identifying periods before, during, and after wheel slip. By segmenting the data, the system can reliably identify wheel slip events while preserving accurate location information from non-slip periods.
Solution Approach 2:
The patent applies local quality by marking only the location data obtained during wheel slip as unreliable, while preserving location data from before and after wheel slip events. This ensures location detection accuracy is maintained for the majority of operational periods.
Data Source
AI summary
A speed control device includes: a first calculation unit to calculate first location information and first speed information from output of a speed generator; a second calculation unit to calculate second location information and second speed information from output of a speed sensor; a route database storage unit to store information to select one of a calculation result of the first calculation unit and a calculation result of the second calculation unit in accordance with a location of a vehicle; and a selection unit to select one of the calculation results on the basis of the information of the route database storage unit to output the information as location information and speed information, in which speed of the vehicle is determined on the basis of the location information and speed information.