Volvo Autonomous Solutions Ab

Robert Hult

Oskar Wigström

Emil Klintberg

Oskar Ljungqvist

Dandan Ge

Stefan Kojchev

Maximilian Kneissl

A method for generating a vehicle trajectory by optimizing a performance measure J. The trajectory may include a sequence of states x=(x)of the vehicle. The optimization is subject to predefined vehicle dynamics x=ƒ(x, u), where uis a control input to the vehicle, and a condition that each position of the vehicle shall be close to a reference path X. The vehicle's position is constrained inside a variable-width corridor around the reference path. A quantity r controlling the width of the corridor is included as an additional optimization variable and the performance measure includes a penalty on the corridor width. To define the corridor, each point of the reference path may be associated with a pair of laterally spaced ellipses and requiring each vehicle position to be outside the ellipses.

Method of reconstructing a vehicle trajectory

Confined areas present an opportunity for early deployment of autonomous vehicles due to the absence of non-controlled traffic participants. In this disclosure, two approaches for coordination of multiple AVs in confined sites. Each approach computes speed-profiles for the AVs such that collisions are avoided in cross intersections, merge-split zones and narrow road sections. Specifically, this is done by solving an optimal control problem where the motion of all vehicles is optimized jointly. The order in which the vehicles pass the crossings is determined through the solution of a Mixed Integer Quadratic Program. Through simulation results, the capability of the algorithm is demonstrated in terms of performance and observance of collision avoidance constraints.

Method and device for coordinating vehicle routes in confined areas

There is provided mechanisms for compensating for backlash in a steering house of a steering system in a vehicle. A method is performed by a controller of the steering system. The method comprises obtaining a hysteresis model of the backlash in the steering house. The hysteresis model has an inverse. The method comprises obtaining a control signal to be input to an electric motor of the steering system. The control signal defines a desired set point for the steering system. The method comprises determining an adjusted set point for the steering system based on the inverse of the hysteresis model, the desired set point, and a current operating point in the hysteresis model. The adjusted set point defines an adjusted control signal. The method comprises compensating for the backlash in the steering house by providing the adjusted control signal, instead of the control signal, as input to the electric motor.

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Torslanda, Sweden

Robert Hult