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Method for determining run-curves for vehicles in real-time subject to dynamic travel time and speed limit constraint

  • US 8,660,723 B2
  • Filed: 11/19/2012
  • Issued: 02/25/2014
  • Est. Priority Date: 06/29/2012
  • Status: Expired due to Fees
First Claim
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1. A method for determining an optimal run-curve for a vehicle along a route between two locations comprising pre-processing steps and real-time processing steps,wherein the preprocessing steps comprise:

  • defining, for the vehicle, a state space based on possible velocities and possible locations along the route;

    generating, from the state space, a transition matrix for possible actions of the vehicle, and for evaluating a set of weights and corresponding travel times, wherein each weight is a relative importance of minimizing the corresponding travel time with respect to a rate of energy consumption E by the vehicle; and

    wherein the real-time processing steps comprise;

    receiving a current travel time T and current speed limits;

    identifying a subspace of the state space based on the current;

    speed limits while considering dynamics of the vehicle;

    updating the transition matrix for the subspace according to the current speed limits;

    determining initial weights for solving a minimization problem using the set of weights and the current travel time;

    determining an optimal weight μ

    by solving the minimization problem with the initial weights; and

    solving the minimization problem sequentially with different weights to obtain the optimal run-curve, wherein the minimization problem uses an objective function μ

    E+(1−

    μ

    )T subject to constraints, wherein the steps are performed in a processor.

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