Autonomous Vehicle Velocity Correction for Path Alignment

Solution Overview

Problem

Autonomous vehicles often deviate from planned navigation paths due to mechanical constraints, leading to excessive power drain and uncomfortable rides due to continuous steering angle adjustments, which existing methods fail to adequately address.

Innovation Solution

A velocity correcting system that receives and adjusts the velocity of an autonomous vehicle by comparing current vehicle conditions with pre-stored values, generating a correction velocity to iteratively apply and maintain alignment with the planned path, reducing the need for continuous steering adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous steering angle adjustment is performed to align the autonomous vehicle with the planned navigation path, then the vehicle can correct path deviation, but excessive power drain occurs and frequent jerks result in uncomfortable drive

Engineering Contradiction:

Improvepath alignment accuracyVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system pre-calculates and stores correction velocities for various vehicle conditions based on trial runs. When navigating, it only needs to look up and apply the pre-computed correction velocity corresponding to the current condition, rather than continuously calculating and adjusting steering angles in real-time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The correction velocity is applied iteratively at every predefined cycle time rather than through continuous adjustment. This periodic application of correction reduces the frequency of control actions while maintaining effective path following, thereby reducing power consumption and minimizing jerks.

Inventive Principle:

Principle #19Periodic action

2Reliability

If continuous steering angle adjustment is performed to align the autonomous vehicle with the planned navigation path, then the vehicle can correct path deviation, but frequent jerks occur resulting in uncomfortable drive

Engineering Contradiction:

Improvepath alignment accuracyVSAvoidride comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system pre-calculates and stores correction velocities for various vehicle conditions based on trial runs. When navigating, it only needs to look up and apply the pre-computed correction velocity corresponding to the current condition, rather than continuously calculating and adjusting steering angles in real-time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The correction velocity is applied iteratively at every predefined cycle time rather than through continuous adjustment. This periodic application of correction reduces the frequency of control actions while maintaining effective path following, thereby reducing power consumption and minimizing jerks.

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If trial runs are conducted under various predefined conditions to generate pre-stored values, then accurate correction velocity can be determined for current vehicle condition, but initial system complexity increases

Engineering Contradiction:

Improvevelocity correction accuracyVSAvoidsystem setup complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system pre-calculates and stores correction velocities for various vehicle conditions based on trial runs. When navigating, it only needs to look up and apply the pre-computed correction velocity corresponding to the current condition, rather than continuously calculating and adjusting steering angles in real-time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system performs self-calibration by conducting trial runs under various predefined conditions to automatically generate the pre-stored correction velocity values. This self-service approach builds the correction database without requiring external manual calibration, reducing long-term system complexity.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3575911B1Method and system for correcting velocity of autonomous vehicle to navigate along planned navigation path

Publication Date: 2022.12.14 WIPRO LTD

Figure 1
Figure 2
Figure 3A~3B

AI summary

Disclosed subject matter relates to field of telematics that performs a method of correcting velocity of autonomous vehicle to navigate along a planned navigation path. A velocity correcting system may receive a velocity for navigating the autonomous vehicle for a selected segment along the planned navigation path and may identify plurality of values corresponding to current vehicle condition while the autonomous vehicle is navigating along the planned navigation path and may determine a counter angular velocity corresponding to current vehicle condition by comparing the plurality of values with pre-stored values. Finally, velocity is corrected by correlating the velocity with counter angular velocity and provided to navigation module for applying the correction velocity. The present disclosure eliminates need for continuous monitoring and steering angle adjustment to align the autonomous vehicle with planned navigation path, thereby reducing power consumption and minimizing jerks experienced by autonomous vehicle.