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Determining departure times for timetable-based trips

  • US 7,003,398 B2
  • Filed: 02/24/2004
  • Issued: 02/21/2006
  • Est. Priority Date: 02/24/2004
  • Status: Active Grant
First Claim
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1. A method comprising:

  • (a) receiving a desired time-of-arrival;

    (b) selecting one of a plurality of entries of a timetable based on;

    (i) the current time,(ii) said desired time-of-arrival, and(iii) a non-negative penalty function;

    wherein each of said entries comprises;

    (i) a scheduled time-of-departure, and(ii) a value that indicates a scheduled time-of-arrival; and

    wherein said penalty function is;

    (i) monotonically increasing in travel time, wherein said travel time equals the difference between an actual time-of-arrival and an actual time-of-departure,(ii) monotonically increasing in Δ

    =(said actual time-of-arrival minus said desired time-of-arrival) over at least one interval (Δ

    1, Δ

    2) of Δ

    wherein Δ

    2>

    Δ

    1

    0, and(iii) monotonically decreasing in Δ

    over at least one interval (Δ

    3, Δ

    4) of Δ

    wherein Δ

    3>

    Δ

    4

    0 and(c) determining a desired departure time based upon the selected one entry.

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