Speed Adaptive Steering Override Detection

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Solution Overview

Problem

Current autonomous and semi-autonomous vehicle steering systems are unreliable in detecting steering override conditions, particularly at high and low speeds, leading to potential driver discomfort and safety issues due to false interpretations of steering wheel movements.

Innovation Solution

A vehicle automated steering override detection system that measures and calculates steering angle and torque measurements, adjusting threshold values based on vehicle speed to accurately determine when to disengage the automated steering control, ensuring precise override detection across various driving scenarios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed steering override threshold is used in automated steering systems, then the system structure is simple, but the system becomes unreliable at high and low speeds causing false override detection

Engineering Contradiction:

Improvesteering override detection reliabilityVSAvoidthreshold calculation system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by transitioning from a fixed steering override threshold to a dynamic, speed-dependent threshold. The threshold is continuously adjusted based on real-time vehicle speed measurements, allowing the system to adapt to varying operating conditions. This resolves the contradiction by maintaining detection reliability across different speeds while managing complexity through a straightforward speed-threshold relationship model.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by making the steering override threshold a variable parameter that changes with vehicle speed. Instead of using a constant threshold value, the system calculates the threshold as a function of speed, thereby improving reliability across the full operating range. The complexity increase is mitigated by using a mathematical model that directly relates speed to threshold values.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the steering override threshold is increased to reduce false detections at high speed, then false override detection is reduced, but the system becomes too sensitive and causes driver over-steering

Engineering Contradiction:

Improvesteering override detection accuracyVSAvoiddriver steering control ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent resolves this contradiction by dynamically adjusting the threshold parameter based on speed. At high speeds, the threshold is increased to prevent false detections, while at low speeds, it is decreased to maintain driver control ease. This speed-dependent parameter adjustment allows the system to optimize both detection accuracy and driver ease of operation across different operating conditions.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the steering override threshold is decreased to improve detection sensitivity, then steering override detection is more sensitive, but the system falsely interprets slight steering wheel movements as override events

Engineering Contradiction:

Improvesteering input detection precisionVSAvoidsteering override detection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent resolves this contradiction by making the threshold parameter speed-dependent. At low speeds, a lower threshold provides sufficient detection precision without causing false positives, while at high speeds, the threshold is increased to prevent misinterpreting normal steering movements as overrides. This dynamic parameter adjustment optimizes both precision and reliability across the full speed range.

Inventive Principle:

Principle #35Parameter changes

4Speed

If the automated steering system responds quickly to steering inputs, then the system response time is reduced, but the system causes sudden movements or jerks in the steering wheel

Engineering Contradiction:

Improvesystem response speedVSAvoidsteering wheel jerk

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by continuously adapting the steering override threshold to current vehicle speed conditions. This dynamic adjustment allows the system to respond appropriately to driver inputs across different speeds without causing harmful jerks. The speed-dependent threshold ensures that the system maintains optimal responsiveness while preventing excessive steering corrections that would manifest as wheel jerks.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8965633B2System and method for speed adaptive steering override detection during automated lane centering

Publication Date: 2015.02.24 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

One or more vehicle steering measurements of a vehicle may be measured. One or more expected vehicle steering measurements may be calculated, each calculated expected vehicle steering measurement corresponding to one of the measured vehicle steering measurements. At least one difference between one of the measured vehicle steering measurements and its corresponding calculated expected vehicle steering measurement may be calculated. A speed of the vehicle may be measured. One or more current threshold values may be calculated based on the measured speed, each of the current threshold values corresponding to one of the measured vehicle steering measurements and its corresponding calculated expected vehicle steering measurement. An automatic vehicle control system may be deactivated when one or more of the calculated differences exceeds its corresponding current threshold value.