NMPC time minimization problem

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Almudena Buelta Méndez 2024-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/2103636-nmpc-time-minimization-problem

评论： Almudena Buelta Méndez 2024-4-18

Hello,

I am using the "Truck and Trailer Automatic Parking Using Multistage Nonlinear MPC" example to get familiar with the MPC toolbox.

My question is, how should I define the cost function if I want to minimize the time, i.e., the duration of the maneuver?

Thank you

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Almudena Buelta Méndez 2024-4-18

Thanks! That's what I thought. However, in the example it says "You can use different ways to define the cost terms. For example, you might want to minimize time, fuel consumption, or parking speed", so I assumed there might be a straightforward approach to do so.

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Answer 1

Akshat Dalal 2024-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/2103636-nmpc-time-minimization-problem#answer_1443686

Hi Almudena,

In typical MPC formulations, the cost function is designed to penalize deviations from desired states and/or control efforts. Minimizing time, however, is not directly about penalizing these deviations but about achieving a goal in the shortest possible time. This requires a slightly different setup because the objective (time) does not naturally fit into the state or control input vectors.

However, you can define a surrogate objective that correlates with time in your cost function. For instance, you could optimize the 'speed' in your cost function as a higher average speed would lead to a shorter time. You could use combine multiple such variable's as an alternate way of minimizing the duration of the manoeuvre.

Hope this helps!