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SMT Solvers for Embedded Hybrid MPC

Author(s):

M. Heinzmann
Conference/Journal:

Semester Thesis; SS17
Abstract:

In this project we were interested in solving hybrid model predictive control (MPC) problems in which one aims at minimizing a quadratic cost function. For MPC to be practical, these problems have to be solved in milliseconds or even microseconds. From [4] we know that we can write hybrid MPC problems as mixed-integer quadratic programs (MIQP) subject to linear equalities and inequalities. However, MIQPs are known to be computationally demanding. Therefore solving these MPC problems within a short time poses a significant challenge. In this project we wanted to explore an alternative way to solve such problems. Namely we used satisfiability modulo theories (SMT) solvers. SMT solvers have often been used in the context of theorem-proving systems (such as PVS[13]) and extended static checking [9] where verification focuses on assertion checking. Our interests in this project were twofold. On the one hand, we wanted to find a general way how to formulate a hybrid MPC problem such that it can be solved by a SMT solver. On the other hand, we wanted to find out how todays state-of-the-art SMT solvers perform compared to MIQP solvers, with which one usually solves hybrid MPC problems with an underlying quadratic cost function. For that we simulated our generalized SMT formulation on two problems from the literature ([3] and [4]) and compared to results obtained from MIQP and SMT solvers.

Supervisors: Damian Frick, John Lygeros

Year:

2017
Type of Publication:

(13)Semester/Bachelor Thesis
Supervisor:



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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2017:IFA_5658
}
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