MOVING VEHICLE SYSTEM AND METHOD OF DETECTING POSITION OF MOVING VEHICLE

• US 20100271011A1
• Filed: 04/20/2010
• Published: 10/28/2010
• Est. Priority Date: 04/24/2009
• Status: Active Grant

• Current Assignee: Murata Machinery Limited (Muratec)
• Original Assignee: Murata Machinery Limited (Muratec)
• Inventors: SHIMIZU, Tetsuya
• Granted Patent: US 8,264,217 B2
• Time in Patent Office: Days
• US Class Current: 324/207.130
• CPC Class Codes: G01V 3/104 using several coupled or uncoupled coils G01V3/101 takes precedence
• CPC Class Codes: G05D 1/0261 using magnetic plots

Abstract

A detection head is provided for a moving vehicle. The detection head includes a coil array defined by a plurality of coils arranged along a moving direction of the moving vehicle. Dummy coils are provided on both sides of the coil array. Based on a difference between outputs of the dummy coils, whether the moving vehicle is in a continuous segment where the magnetic marks are provided at a constant first pitch or a discrete segment where the magnetic marks are arranged at a pitch wider than the first pitch is identified.

Claims

1. A moving vehicle system comprising:

a moving vehicle; and

a moving route of the moving vehicle;

wherein

said moving vehicle includes a detection head arranged to detect a position of the moving vehicle along the moving route, the detection head including a coil array including a plurality of coils arranged along a moving direction of the moving vehicle and dummy coils on both sides of the coil array;

said moving route including magnetic marks, and continuous segments where the magnetic marks are provided at a constant first pitch to determine the position of the moving vehicle continuously, and discrete segments where the magnetic marks are arranged at a pitch wider than the first pitch to determine the position of the moving vehicle only where the detection head detects the magnetic marks; and

said moving vehicle further includes an identification unit arranged to identify whether the moving vehicle is in one of the continuous segments or one of the discrete segments based on a difference between outputs of the dummy coils.

2. The moving vehicle system according to claim 1, wherein the coil array and the dummy coils are arranged to be driven by a common alternating current power supply, and coils of the coil array and the dummy coils are arranged around a common magnetic core in series.

3. The moving vehicle system according to claim 2, wherein the dummy coils and the coils of the coil array have a same shape.

4. The moving vehicle system according to claim 1, wherein the dummy coils on both sides of the coil array are arranged to be serially connected to an alternating current power supply, and whether the moving vehicle is in one of the continuous segments or one of the discrete segments is identified by comparing a phase of a potential at a middle point of the dummy coils on both sides of the coil array with a phase of the alternating current power supply.

5. A method of detecting a position of a moving vehicle along a moving route of the moving vehicle, the method comprising the steps of:

providing the moving vehicle with a detection head including a coil array including a plurality of coils arranged along a moving direction of the moving vehicle and dummy coils on both sides of the coil array;

providing the moving route with magnetic marks;

providing the moving route with continuous segments where the magnetic marks are provided at a constant first pitch and discrete segments where the magnetic marks are arranged at a pitch wider than the first pitch;

identifying by the detection head whether the moving vehicle is in one of the continuous segments or one of the discrete segments according to a difference between outputs of the dummy coils;

determining the position of the moving vehicle continuously by the detection head in one of the continuous segments; and

determining the position of the moving vehicle by the detection head only where the detection head detects the magnetic marks in the discrete segments.