Vehicle Velocity Correction Using Radar Static Target Graphs
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Solution Overview
Problem
Existing vehicle speed calculation methods using wheel rotation velocity are inaccurate due to tire wear and air pressure changes, leading to instability in engine and transmission control.
Innovation Solution
A driver assistance system that uses radar data to determine static targets and correct vehicle velocity by generating and comparing graphs, ensuring accurate velocity calculation and stable engine or transmission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vehicle velocity is calculated by multiplying wheel rotation velocity by wheel radius, then the calculation is simple, but the accuracy deteriorates due to tire wear and air pressure changes
Solution Approach 1:
The patent introduces radar as an intermediary measurement tool to obtain actual vehicle velocity independently of wheel sensors. The radar measures the velocity of static targets and calculates actual vehicle velocity through mathematical processing, serving as a mediator between the unreliable wheel-based measurement and the required accurate velocity data for control systems.
Solution Approach 2:
The patent replaces the mechanical wheel-based velocity measurement system with a radar-based electromagnetic measurement system. Instead of relying on mechanical wheel rotation sensors affected by tire conditions, the system uses radar waves to measure velocity, substituting a mechanical measurement approach with a non-contact electromagnetic field-based approach.
2Ease of operation
If inaccurate vehicle velocity is used in engine and transmission control, then the control system operates with existing data, but the stability deteriorates due to velocity differences
Solution Approach 1:
The patent implements a feedback mechanism where the radar-measured actual vehicle velocity is continuously compared with the wheel-based calculated velocity. The system uses this feedback to generate correction values that are applied to the control systems, creating a closed-loop control structure that maintains stability despite tire wear and air pressure changes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system accurately calculates vehicle velocity and stabilizes engine or transmission control by using radar data to correct for differences in wheel sensor measurements, enhancing overall vehicle performance.
Implementation Method 1
a radar provided in the vehicle to have an external sensing field for the vehicle and configured to acquire radar data
Data Source
AI summary
A driver assistance system according to an embodiment of the present disclosure includes: a radar provided in the vehicle to have an external sensing field for the vehicle and configured to acquire radar data; a memory configured to store a first graph stored in advance; and a processor configured to determine a static target based on the radar data and driving information comprising a driving velocity, generate a second graph based on the determined static target, and correct the driving velocity based on the first graph and the second graph.