Vehicle Speed Control Device Using Location Error Probability
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Solution Overview
Problem
Existing vehicle speed control devices face challenges in accurately determining target speeds due to positioning errors, leading to rapid speed changes and potential missed targets, causing driver discomfort.
Innovation Solution
A vehicle speed control device that estimates location error probabilities using area attribute information from map data, adjusts target speeds to create a continuous curve, and controls vehicle speed to prevent uncomfortable changes, ensuring the vehicle does not miss targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If target speed is determined based on map information and current location using positioning means, then speed control within object zone is achieved, but positioning errors cause rapid speed changes and missed targets
Solution Approach 1:
The system performs preliminary actions by determining upper and lower limit speeds in advance based on map information before actual speed control execution. This allows the control device to prepare speed boundaries that account for positioning errors, preventing rapid speed changes and missed targets by having pre-calculated speed limits ready for comparison with actual positioning data.
2Measurement precision
If current location is corrected by mapping positioning data on running route, then location accuracy is improved, but large differences cause current location to jump on map information
Solution Approach 1:
The system applies beforehand cushioning by establishing upper and lower limit speeds that act as buffers against positioning errors. When positioning data shows large deviations, these pre-determined speed limits prevent abrupt corrections that would cause location jumps, instead allowing smooth transitions that maintain stability while still correcting location accuracy over time.
3Speed
If vehicle speed changes rapidly to reach target speed, then speed control responsiveness is improved, but driver comfort deteriorates
Solution Approach 1:
The system applies dynamics by making the speed control adaptable and flexible rather than rigid. The upper and lower limit speeds create a dynamic control range that allows the vehicle to respond to positioning data changes smoothly. Instead of abrupt speed changes, the system dynamically adjusts within the permitted range, maintaining responsiveness while ensuring comfort through gradual transitions.
Data Source
AI summary
The present invention relates to a vehicle speed control device for controlling a speed of a vehicle. The vehicle speed control device includes a current location error estimation section for extracting area attribute information from the map information, for producing a location error probability distribution, a target speed calculation section for receiving the target speed correction instruction, for accessing preset data that shows an acceleration or a gradient of an acceleration which allows a driver not to feel uncomfortable, and for computing target speed values at nodes over the distance in such a way that the target speed values create a continuous curve, and a speed control section for sensing a speed of a vehicle, and for controlling a driving torque of the vehicle so that the sensed speed traces the continuous curve composed of the target speed values.