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ASC objectives for SOV

  1. to complete the American Solar Challenge base route without trailering

  2. to complete as many official miles as possible

  3. to complete the distance in the shortest elapsed time

We should focus on the first two.

Additional Constraints (From ASC2024 Regs B)

  1. “The Standard Tour Day is from 9:00 am – 6:00 pm (9 hours). Actual Tour hours may be adjusted to start later or end earlier than the standard racing day based on the exact Segment distances and coordination of activities at each of the Stage/Check Points.”

  2. “Solar cars must observe a maximum speed limit of 104.6 km/h (65 mph) or the posted speed limit (whichever is lower), unless further restricted by the Officials per Reg. 10.9.B.”

  3. “In areas with a posted speed limit of at least 96.6 km/h (60 mph), teams shall maintain a minimum speed of 32.2 km/h (20 mph) unless trapped behind other traffic. Teams unable to maintain this speed must pull over at the next safe opportunity to resolve the issue.”

What are our outputs?

  1. What speed should we drive at?

  2. Should we should do a loop?

What are the inputs to this function?

How our car consumes, captures, and stores energy: E(stored) = E(in) - E(out)

Consumption: Past consumption can be measured/logged to inform the car’s current state. Future consumption needs to be predicted to inform strategy.

Capture: Predict the amount of solar energy available in a day depending on space and time.

Storage: Is charging or discharging preferred at a given time.

Our goal?

Maximize driving distance, within ~9 hours, using the available energy.

To-do:

  1. Consumption Prediction

    1. Motors

      1. Drag force (velocity, weather)

      2. Gravitational force (slope of track)

      3. Friction force (velocity, slope of track)

      4. Losses / Efficiency (rpm, torque)

    2. Auxillary

  2. Capture Prediction

    1. Weather (space, time) → Solar Irradiance (orientation) → PV efficiency

  3. Optimization???

Required:

  1. Consumption Prediction.

Rodrigo Tiscareno Can you get me a tabular data set with the inclination, wind speed, and wind direction for all times at all locations on a given route for a single day. Location can just be a scalar value of the distance along a course.

Location

Time

Incline

Wind Speed

Wind Direction

  1. Capture Prediction

TBD

Bibliography

Optimal energy management for solar-powered cars. (n.d.). Retrieved November 9, 2023, from https://find.library.unisa.edu.au/discovery/delivery/61USOUTHAUS_INST:ROR/12146635320001831

Howlett, P., & Pudney, P. (1998). An optimal driving strategy for a solar powered car on an undulating road. Dynamics of Continuous, Discrete and Impulsive Systems, 4.

Pudney, P., & Howlett, P. (2002). Critical Speed Control of a Solar Car. Optimization and Engineering, 3, 97–107. https://doi.org/10.1023/A:1020907101234

Selin, I. A., Kasatkin, I. I., Zakhlebaev, E. A., & Hemminger, O. P. (2019). Building a time-optimal power consumption strategy for a solar car. IOP Conference Series: Materials Science and Engineering, 643(1), 012004. https://doi.org/10.1088/1757-899X/643/1/012004

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