Device for guiding vehicles on a virtual track

• US 5,136,225 A
• Filed: 12/19/1991
• Issued: 08/04/1992
• Est. Priority Date: 04/14/1989
• Status: Expired due to Term

• Current Assignee: GEC Alsthom SA
• Original Assignee: GEC Alsthom SA
• Inventors: Heddebaut, Marc, Duhot, Denis, Degauque, Pierre
• Primary Examiner(s): Ip, Paul
• Application Number:
  US07/810,535
• Time in Patent Office: 229 Days
• Field of Search: 318/580-587, 318/590-593, 318/135, 455/3, 455/40, 455/41, 455/100, 180/167-169, 364/424.01, 364/424.02, 343/18 A, 343/770, 343/6.5 R, 346/187 C, 346/187 B, 346/7, 342/351
• US Class Current: 318/587
• CPC Class Codes: G05D 1/0265 using buried wires

Abstract

A vehicle guidance system for guiding a vehicle on a virtual track includes a waveguide connected to a member emitting electromagnetic radiation at a frequency between 1 and 100 kHz and disposed on the axis of the track to be followed. At least one set of two magnetic sensors disposed on the vehicle receive the field to determine the lateral offset of the vehicle relative to the axis of the track.

Claims

1. In a vehicle guidance system for guiding a vehicle having a vehicle axis along a virtual track having a track axis, said system including lateral guidance means disposed on the axis of the track for emitting a magnetic field generated by an electromagnetic signal of a frequency of between 1 and 100 kHz and said vehicle comprising at least one set of magnetic sensors for sensing said magnetic field, the improvement wherein:

said means for emitting said magnetic field comprises a waveguide connected to an electromagnetic generator emitting said electromagnetic signal, said waveguide also being connected to a microwave transmitter and receiver for transmitting and receiving microwave signals for both speed and vehicle positioning monitoring, said waveguide including an upper face equipped with longitudinally spaced slots,

said at least one set of magnetic sensors comprise at least two sensors disposed respectively on opposite sides of the vehicle axis, said sensors delivering output signals in response to the magnetic induction received, and calculating means connected to said at least two sensors and receiving said output signals and for processing said output signals to determine the horizontal offset of the vehicle axis with respect to the track axis and said vehicle further comprising means for transmitting and receiving said microwave signals,

and wherein said at least two sensors comprise tow sets of two sensors, each set being fitted on the vehicle at a different vertical level above said waveguide, each sensor of a same set being at the same height with respect to said track and arranged to receive a magnetic induction parallel to the vehicle axis,

and wherein said calculating means comprises means for determining said horizontal offset independently of the distance separating the sets of sensors from the track.

2. In a vehicle guidance system for guiding a vehicle having a vehicle axis along a virtual track having a track axis, said system including lateral guidance means disposed on the axis of the track for emitting a magnetic field generated by an electromagnetic signal of a frequency of between 1 and 100 kHz and said vehicle comprising at least one set of magnetic sensors for sensing said magnetic field, the improvement wherein:

said means for emitting said magnetic field comprises a waveguide connected to an electromagnetic generator emitting said electromagnetic signal, said waveguide also being connected to a microwave transmitter and receiver for transmitting and receiving microwave signals for both speed and vehicle positioning monitoring, said waveguide including an upper face equipped with longitudinally spaced slots,

said at least one set of magnetic sensors comprise at least two sensors disposed respectively on opposite sides of the vehicle axis, said sensors delivering output signals in response to the magnetic induction received, and calculating means connected to said at least two sensors and receiving said output signals and for processing said output signals to determine the horizontal offset of the vehicle axis with respect to the track axis and said vehicle further comprising means for transmitting and receiving said microwave signals,

and wherein said at least two sensors are fitted on the vehicle at the same height above said waveguide and arranged to receive the magnetic induction parallel to the vehicle axis.

3. A system according to claim 2, wherein the output signals delivered by the sensors are representative of the vertical component of the magnetic induction.

4. A system according to claim 3, wherein the sensors comprises circuits tuned to the frequency of the signal emitted by the electromagnetic generator and each sensor comprising a coil having a magnetic core.

5. A system according to claim 4, wherein the axis of the coils is vertical.

6. In a vehicle guidance system for guiding a vehicle having a vehicle axis along a virtual track having a track axis, said system including lateral guidance means disposed on the axis of the track for emitting a magnetic field generated by an electromagnetic signal of a frequency between 1 and 100 kHz and said vehicle comprising at least one set of magnetic sensors for sensing said magnetic field, the improvement wherein:

said means for emitting the magnetic field comprises a waveguide connected to an electromagnetic generator emitting said electromagnetic signal, said waveguide being further connected to a microwave transmitter and receiver used for speed and position monitoring and transmitting and receiving microwave signals and said waveguide having an upper face including a plurality of longitudinally spaced slots,

said system further comprising at least one set of two sensors, the sensors of said at least one set being disposed along the vehicle axis and at the same vertical height above the waveguide and arranged such that one of said two sensors detects a component of the magnetic induction parallel to the vehicle axis and said other of said two sensors detects a component of the magnetic induction transverse to the vehicle axis, said sensors each providing an output signal, and calculating means connected to said two sensors and including means for collecting and processing said output signals for determining the horizontal offset of the vehicle axis with respect to the track axis and said vehicle further comprising means to transmit and receive said microwave signals,

and wherein said at least one set of two sensors comprises two sets of sensors, said two sets being fitted on the vehicle at different vertical levels above said waveguide, and said calculating means including means for determining the horizontal offset of the vehicle axis with respect to the track axis independently of the vertical distance separating the sets of sensors from the track.

7. The system according to claim 6, wherein the sensors comprise circuits tuned to the frequency of the signal emitted by the electromagnetic generator, and wherein each sensor comprises a coil having a magnetic core.

8. The system according to claim 7, wherein the axis of the coils is vertical.

9. The system according to claim 7, wherein the output signals delivered by the sensors are representative of the vertical component of the magnetic induction.

10. The system according to claim 6, wherein the sensors comprise circuits tuned to the frequency of the signals emitted by the electromagnetic generator, and each sensor comprises a coil having a magnetic core.