Vehicle Speed Estimation Using Weighted Multi-Sensor Measurements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle speed estimation systems face inaccuracies due to unmodeled dynamics, driveline damping, and axle/lash issues, particularly at low speeds, which can lead to errors in autonomous vehicle braking and control.
Innovation Solution
A longitudinal vehicle speed estimation system that combines wheel speed data from sensors with GPS output, motor/engine speed, and axle parameters, using weighting and filtering modules to adjust and sum speed estimates, and accounts for steering angle and potential sensor faults to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple speed measurements are combined to improve accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent divides the speed estimation system into separate functional modules: a weighting module that processes sensor inputs and a filtering module that refines the output. This segmentation allows each module to perform a specific function, making the overall complex system more manageable and maintainable while achieving high measurement precision.
Solution Approach 2:
The vehicle speed estimation system is designed to work with multiple types of sensors and drive units (electric motors, internal combustion engines). The weighting and filtering modules are universal components that can process inputs from various sensor types, reducing overall system complexity by using common processing architecture across different vehicle configurations.
Data Source
AI summary
A longitudinal vehicle speed sensor for a vehicle includes a first sensor configured to generate a first measured speed based on one of a wheel speed of the vehicle receiving output torque from a drive unit and an output of a global positioning system (GPS). A second sensor is configured to generate a second measured speed. A speed weighting module is configured to apply a first weight to the first measured speed to generate a first weighted speed. A speed weighting module is configured to apply a second weight to the second measured speed to generate a second weighted speed. An output module is configured to generate a speed estimate based on the first weighted speed and the second weighted speed.