Method for the evaluation of road classfication in navigation systems

• US 20030105582A1
• Filed: 03/22/2002
• Published: 06/05/2003
• Est. Priority Date: 03/30/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Nordsiek, Walter
• Granted Patent: US 6,640,183 B2
• Time in Patent Office: Days
• US Class Current: 701/200
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network

Abstract

The present invention is directed to a method for rating road classifications in navigational systems. The idea underlying the present invention is for the above described, static rating of the road classifications using fixed average speeds input into the system, to be replaced by or, if necessary, supplemented with continuously corrected, i.e., updated speed values.

Claims

1. A method for rating road classifications in a vehicle navigational system, where an average vehicle-speed value is assigned to one or more partial sections K of a particular driven road, for rating purposes,

characterized by the step of adapting (220, 225, 230, 235) the average vehicle-speed value v(tn, K), which is relevant to the rating, during travel, at repeated instants tn, tn+1, . . . in accordance with the actually reached speeds v(tn), v(tn+1), . . . , through a recalculation.

2. The method as recited in claim 1,

where, for the recalculation, a filtering takes place over time for the average vehicle-speed value v(tn, K) which is relevant to the rating.

3. The method as recited in one of the preceding claims,

where provision is made for a variable weighting (230) of the influence of the adaptation on the recalculation.

4. The method as recited in one of the preceding claims,

where the arrival time at the destination is displayable using a short-term adaptation, including a low time constant;

and the recalculation of the average vehicle-speed values v(tn, K) relevant to the rating takes place using a long-term adaptation, including a larger time constant.

5. The method as recited in one of the preceding claims,

where the system user is able to propose a starting value for recalculating the average value that is relevant to the rating.

6. The method as recited in one of the preceding claims,

where, for the recalculation of the average vehicle-speed value v(tn, K) relevant to the rating, the active average value v(tn+1) is used as a base quantity, and the different road classifications are taken into account using percentage increases or decreases.

7. The method as recited in one of the preceding claims,

including the step of giving the user a variably adjustable way to influence route proposals to be generated by the system, in order to eliminate or minimize the influence of values learned by the system.