Train Speed Profile Creation Optimizing Energy and Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing speed profile creation methods for trains fail to optimize energy consumption and riding comfort, often resulting in suboptimal energy savings and increased traveling time due to limitations in adjusting maximum speed and considering coasting sections effectively.
Innovation Solution
A speed profile creation device that uses a traveling simulator, initial speed profile setter, and optimizer to generate and refine speed profiles by adjusting coasting sections and maximum speeds, ensuring target traveling time is met while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If maximum speed is first adjusted to satisfy target traveling time, then traveling time constraint is met, but energy consumption is not optimized and reduction is insufficient
Solution Approach 1:
The invention changes the approach from adjusting only maximum speed to adjusting multiple parameters including coasting start position, coasting end position, and maximum speed. This multi-parameter optimization enables both traveling time constraint satisfaction and energy consumption optimization by exploring a broader solution space.
Solution Approach 2:
The invention dynamically adjusts the speed profile by iteratively modifying coasting sections and maximum speeds based on energy consumption evaluation. The system transitions from a static maximum-speed-first approach to a dynamic optimization process that adapts the speed profile to achieve minimum energy consumption while meeting time constraints.
2Use of energy by moving object
If coasting sections are added to reduce energy consumption, then energy saving improves, but traveling time may exceed target and train may stop between stations
Solution Approach 1:
The invention implements a feedback mechanism where the traveling time and energy consumption are evaluated after creating a speed profile with coasting sections. If the traveling time exceeds the target, the system adjusts the coasting sections and maximum speeds iteratively until both time and energy optimization goals are achieved.
Solution Approach 2:
The invention performs preliminary evaluation of the speed profile to check if traveling time satisfies the target before finalizing the profile. This preliminary check prevents excessive coasting that would cause train stops between stations, ensuring both energy savings and timely arrival.
3Loss of time
If maximum speed is limited to satisfy traveling time, then traveling time is met, but search range is limited and maximum speed falls below ideal pattern
Solution Approach 1:
The invention segments the speed profile into multiple controllable sections: acceleration section, coasting section (with start and end positions), and deceleration section. This segmentation allows independent adjustment of each section's parameters, expanding the search range for optimization while ensuring traveling time constraints are met.
Solution Approach 2:
The invention adds new dimensions to the optimization problem by introducing coasting start position and coasting end position as adjustable parameters alongside maximum speed. This transforms the optimization from a one-dimensional maximum-speed adjustment to a multi-dimensional parameter optimization, significantly expanding the solution space.
Data Source
AI summary
A speed profile creation device includes: a traveling simulator that creates, from a traveling instruction, a speed profile of allowing the train to travel through a traveling section together with a traveling time and energy consumption amount thereof by using a route condition, train performance, and a traveling condition; a traveling instruction draft creator that creates a plurality of traveling instruction drafts in which a reference speed profile is changed so that the energy consumption amount can decrease though the traveling time is lengthened a little; an optimum speed profile selector that selects an optimum speed profile in which an energy consumption amount reduction effect is maximum among the plurality of traveling instruction drafts; and a reference speed profile updating unit that updates the reference speed profile until the traveling time of the optimum speed profile becomes equivalent to the target traveling time.