Vehicle Speed Control for Desired Arrival Time
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Solution Overview
Problem
Current vehicle systems, such as smart cruise control and lane departure warning, do not effectively allow drivers to set and maintain a desired arrival time at a destination, considering traffic volume and distance, leading to inefficiencies in route planning and speed adjustment.
Innovation Solution
A method that involves the driver setting a destination, calculating the distance and current traffic volume, determining if the vehicle can arrive within the desired time, and automatically adjusting speed using equations to maintain or adjust the vehicle's speed to ensure timely arrival, with options to reset the desired arrival time or switch to manual control if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle maintains a constant speed set by the driver (smart cruise control), then the driver's convenience is improved, but the vehicle cannot arrive at the destination within a desired arrival time when traffic conditions change
Solution Approach 1:
The system dynamically adjusts the vehicle's speed based on real-time traffic conditions and calculated arrival time requirements. Instead of maintaining a constant speed, the control speed is continuously updated by the controller based on the difference between current arrival time and desired arrival time, allowing the vehicle to adapt to changing traffic conditions while working toward the arrival time goal
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors the current arrival time, compares it with the desired arrival time, and adjusts the control speed accordingly. The controller calculates whether the vehicle will arrive on time and modifies the speed setpoint to either maintain or reduce speed to achieve the desired arrival time, creating a closed-loop control system
2Measurement precision
If the vehicle automatically adjusts speed to meet desired arrival time, then the arrival time accuracy is improved, but the system complexity increases
Solution Approach 1:
The controller performs multiple functions: it calculates the current arrival time based on distance and speed, compares it with the desired arrival time, determines whether speed adjustment is needed, and outputs the appropriate control speed. This multi-functionality is achieved within a single control unit, reducing the need for separate dedicated components for each function
Solution Approach 2:
The system changes the speed parameter dynamically based on calculated arrival time requirements. The controller adjusts the control speed by adding or subtracting from the current speed setpoint based on the time difference calculation, allowing precise control of arrival time through parameter modification rather than complex mechanical adjustments
3Loss of time
If the vehicle reduces speed to meet desired arrival time in heavy traffic, then the arrival time is improved, but the productivity decreases
Solution Approach 1:
The system applies partial speed reduction only when necessary to meet the desired arrival time. Rather than continuously reducing speed, the controller calculates the exact speed adjustment needed based on the time difference and traffic conditions, applying just enough speed modification to achieve the arrival goal without unnecessary productivity loss
Data Source
AI summary
Disclosed herein are methods for automatically adjusting a speed of a vehicle capable of allowing the vehicle to arrive at a destination within a time desired by a driver in consideration of a desired arrival time to the destination, a distance to the destination, a current traffic volume, or the like. A method for adjusting a speed of a vehicle in a system for adjusting a speed of a vehicle may include a driver of the vehicle setting a destination, and the system for adjusting a speed of a vehicle searching a path to the destination and calculating a distance to the destination and a current traffic volume to calculate an arrival time to the destination. The method may further include the driver setting a desired arrival time to the destination, and the system for adjusting a speed of a vehicle deciding whether or not the vehicle arrives at the destination within the desired arrival time.