Vehicle control system

Patent metadata

Field	Value
Publication number	US-11453422-B2
Application number	US-201816764901-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Nov 21, 2017
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

The present invention is provided with: a sensing unit which is provided in a vehicle and measures the three-dimensional shape of an object; a matching unit for performing matching between multiple sets of structure information, in which are associated a data group indicating the three-dimensional shapes of structures provided beforehand near a path the vehicle will travel along and positional information indicating the posit ions of the structures, and a data group indicating the three-dimensional shape of the object measured by the sensing unit, and for specifying the position of the object; and an estimated position determination unit for determining, with the position specified by the matching unit as a reference position, the estimated position of the vehicle on the basis of the reference position.

First claim

The invention claimed is:

1. A vehicle control system comprising:
a sensing unit which is provided on a vehicle and measures three-dimensional shapes of objects;
a matching unit which performs a process of matching between information on a plurality of structures in which a data group representing three-dimensional shapes of structures provided beforehand adjacent to a track on which the vehicle travels is associated with position information representing positions of the structures and a data group representing three-dimensional shapes of objects measured by the sensing unit and locates positions of the objects; and
an estimated position determination unit which sets a position located by the matching unit as a reference position and determines an estimated position of the vehicle based on the reference position,
characterized in that:
the structures provided beforehand are components constituting contact line equipment adjacent to the track including a trolley wire and a catenary and hangers to hang and support the trolley wire; and
the sensing unit is installed in a position shifted from underneath a trolley wire which is one of the components constituting the contact line equipment and measures three-dimensional shapes of the contact line equipment from an oblique direction.

2. The vehicle control system according to claim 1 , characterized in that:
the vehicle control system comprises a travel distance measurement unit which measures travel distance of the vehicle from the reference position; and
the estimated position determination unit adds travel distance measured by the travel distance measurement unit to the reference position and determines a position thus obtained as an estimated position of the vehicle.

3. The vehicle control system according to claim 2 , characterized in that:
the matching unit calculates a degree of similarity between each piece of data in a data group representing three-dimensional shapes of structures in a predetermined range on the track and a data group representing three-dimensional shapes of objects measured by the sensing unit and decides whether or not the degree of similarity of each exceeds a threshold; and
if it has been decided by the matching unit that no degree of similarity exceeds the threshold, the estimated position determination unit adds travel distance measured by the travel distance measurement unit to the reference position and determines a position thus obtained as an estimated position of the vehicle.

4. The vehicle control system according to claim 3 , characterized in that, as a range that is subject to the process of matching next to the predetermined range, the matching unit sets a range on the track in which the vehicle is anticipated to be positioned, based on the estimated position of the vehicle and speed of the vehicle.

5. The vehicle control system according to claim 1 , characterized in that the vehicle control system comprises a control unit which performs control of the vehicle using estimated positions of the vehicle determined by the estimated position determination unit.

6. The vehicle control system according to claim 1 , characterized in that:
specified position information is provided which represents specified positions of structures specified beforehand among the structures provided beforehand; and
the estimated position determination unit decides whether or not a position located by the matching unit is a specified position and, if having decided that it is the specified position, sets the specified position as the reference position and determines the reference position as an estimated position the vehicle.

7. The vehicle control system according to claim 6 , characterized in that the structures specified beforehand are supports which are component of contact line equipment adjacent to the track.

Assignees

• Hitachi Ltd

Inventors

• Nishino Takayoshi
• Tsutsumi Yuhi
• Oda Atsushi
• Maki Kentaroh
• Wajima Takenori
• Tokuyama Kazuo

Classifications

• B60L2240/70

  Interactions with external data bases, e.g. traffic centres · CPC title

• B61L25/02 Primary

  Indicating or recording positions or identities of vehicles or trains · CPC title

• B61L23/041

  Obstacle detection · CPC title

• B60L3/00

  Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption (methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00) · CPC title

• B61L25/025

  Absolute localisation, e.g. providing geodetic coordinates · CPC title