DocumentCode :
3423533
Title :
On a conventional receding horizon regulator for a nonholonomic mobile robot
Author :
Majima, Sumiko
Author_Institution :
Grad. Sch. of Syst. & Inf. Eng., Univ. of Tsukuba, Tsukuba, Japan
fYear :
2009
fDate :
9-11 Dec. 2009
Firstpage :
139
Lastpage :
144
Abstract :
A car-like mobile robot has nonholonomic constraints, and according to Brockett´s theorem, this robot is not asymptotically stabilized by a smooth and time-invariant feedback control law. Receding horizon (RH) control methods for the problem have been proposed by several researchers. They defined several terminal constraints and switched a controller to reach each terminal condition in series. In contrast, we have shown that a conventional RH control method can solve a kind of back-into-garage problem without defining terminal constraints. In the simulations, an obtained trajectory consists of two processes. In the first process a vehicle first moves forward and then turns to the right. In the second process, the vehicle again approaches a target through rearward movement. Although an obtained trajectory consists of two processes and there is discontinuance between the two processes, they need not switching controllers. It is intriguing. The present paper attempts to clarify why the conventional RH control method can solve such a problem. The time history of the cost function indicates that the RH control method finds tentative control inputs around the switching time and then allows the system to move into the second process. An inaccuracy in the obtained optimal solution helps the conventional RH control to solve the problem while it does not degrade the performance of the closed-loop trajectory. The result suggests the possibility that a slightly-inaccurate algorithm for solving an optimal problem solves another similar control problem that requires switching controllers.
Keywords :
closed loop systems; mobile robots; position control; time-varying systems; Brockett theorem; RH control; back-into-garage problem; closed-loop trajectory; cost function; nonholonomic constraint; nonholonomic mobile robot; receding horizon regulator; switching controller; switching time; Constraint theory; Control systems; Cost function; Degradation; Feedback control; History; Mobile robots; Optimal control; Regulators; Vehicles;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control and Automation, 2009. ICCA 2009. IEEE International Conference on
Conference_Location :
Christchurch
Print_ISBN :
978-1-4244-4706-0
Electronic_ISBN :
978-1-4244-4707-7
Type :
conf
DOI :
10.1109/ICCA.2009.5410168
Filename :
5410168
Link To Document :
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