Vehicle Speed Limiter Override for Temporary Passing Speed
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Solution Overview
Problem
Current vehicle speed limiter systems are too restrictive, limiting drivers' ability to exceed predetermined speeds for short periods, which can be necessary for safe maneuvers like evasive actions or passing, while also failing to provide flexibility to comply with tire ratings and reduce greenhouse gas emissions effectively.
Innovation Solution
A dynamic vehicle speed limiter system that allows drivers to temporarily override the normal speed limit by setting a higher override speed for a limited time or distance, based on the number of previous overrides within a defined assessment interval, ensuring compliance with regulations and tire specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a vehicle speed limiter is implemented to reduce GHG emissions and improve fuel efficiency, then fuel efficiency and emissions compliance are improved, but driver flexibility and ability to perform safe maneuvers are worsened
Solution Approach 1:
The speed limiter transitions from a static fixed speed limit to a dynamic system that adjusts the maximum speed threshold based on driver requests and safety conditions. The system allows the speed limit to change between a first maximum speed (normal operation) and a second higher speed (override mode), enabling adaptability while maintaining fuel efficiency benefits during normal operation.
Solution Approach 2:
The system changes the speed parameter dynamically by allowing temporary overrides of the maximum speed limit. When a driver requests an override and safety conditions are met, the system temporarily increases the maximum speed parameter from the first speed to a second higher speed, then returns to the original limit, balancing fuel efficiency with operational flexibility.
2Reliability
If a fixed maximum speed limit is enforced to comply with tire ratings and regulations, then compliance and safety are improved, but operational efficiency and driver response time are worsened
Solution Approach 1:
The system implements a dynamic speed limit that can temporarily exceed the first maximum speed when safety conditions are met, allowing operators to perform passing maneuvers or respond to hazards without permanently compromising compliance with tire ratings and regulations during normal operation.
Solution Approach 2:
The system evaluates safety conditions and driver requests in advance before allowing a speed override, ensuring that compliance requirements are maintained while enabling timely operational responses when safe to do so.
3Ease of operation
If a speed override feature is added to provide driver flexibility, then driver control and maneuverability are improved, but system complexity and risk of excessive speed usage are worsened
Solution Approach 1:
The system incorporates feedback mechanisms by monitoring driver requests, evaluating safety conditions, and providing information about override availability and status. This feedback loop ensures controlled complexity while maintaining ease of operation through clear driver-system communication.
Solution Approach 2:
The speed control system is segmented into distinct operational modes (normal operation at first maximum speed and override mode at second higher speed), with clear transitions between them based on driver requests and safety conditions, simplifying the overall system architecture.
Data Source
AI summary
Systems and methods for dynamically limiting the road speed of a vehicle are provided herein. The method includes limiting the speed of the vehicle to a predetermined first speed under normal operating conditions. The method further includes selectively engaging an override condition for an activation interval responsive to an operator generated input. The override condition may be limited to a determined number of times in an activation assessment interval. During an activation interval of the override condition, the vehicle can exceed the predetermined first speed by a specified offset that defines a second speed greater than the first speed. The activation interval may be a period of time or a distance. The override condition is not available when the number of activations in the activation assessment interval exceeds a threshold value. The activation assessment interval may be defined by a period of time, a distance, an event or action, etc.