Intelligent driverless vehicle

• US 4,620,280 A
• Filed: 07/29/1983
• Issued: 10/28/1986
• Est. Priority Date: 07/29/1983
• Status: Expired due to Fees

• Current Assignee: SI Handling Systems, Inc. (Paragon Technologies Incorporated)
• Original Assignee: SI Handling Systems, Inc. (Paragon Technologies Incorporated)
• Inventors: Conklin, Barry C.
• Primary Examiner(s): Lall, Parshotam S.
• Application Number:
  US06/518,570
• Time in Patent Office: 1,187 Days
• Field of Search: 364/424, 364/426, 364/449, 364/460, 364/461, 104/300, 104/301, 104/295, 104/166, 104/165, 318/587, 180/168, 180/169, 180/167
• US Class Current: 701/20
• CPC Class Codes: B65G 35/063 the traction element being a rotating bar or tube

Abstract

An intelligent driverless vehicle rolls on a track and has a pair of drive wheels which engage with a rotating drive shaft. The angular position of the drive wheels relative to the drive shaft determines the speed of the vehicle. Each vehicle has a microcomputer associated therewith, a position encoder for supplying information regarding the position of the vehicle to the microcomputer, an angular position encoder for providing information regarding the angular position of the drive wheels to the microcomputer for the computation of vehicle speed, and a drive wheel control means and associated linkage for changing the angular position of the drive wheels and thus vehicle speed in response to commands from the onboard microcomputer. The microcomputer communicates with a central computer via a bidirectional communications link. The central computer controls the speed and acceleration of each vehicle by selectively communicating with the microcomputers on board the vehicles.

Claims

1. Apparatus comprising:

(a) a vehicle mounted on support wheels adapted to ride on a track;

(b) drive wheel means mounted on said vehicle, said drive wheel means including a drive wheel oscillatible between a drive position and an accumulation position;

(c) a slave computer associated with said vehicle;

(d) drive wheel control means disposed on said vehicle, said drive wheel control means having an output shaft movable in response to signals generated by said slave computer;

(e) a control linkage operatively connected to said drive wheel means and to said output shaft, said control linkage being responsive to movement of said output shaft to oscillate said drive wheel between said drive position and said accumulation position;

whereby the movement of said vehicle is regulated by adjusting said drive wheel position in accordance with signals provided by said slave computer.

2. Apparatus according to claim 1 further comprising an angular position encoder associated with said drive wheel control means, said angular position encoder providing an output signal representative of the angular position of said drive wheel means to said slave computer.

3. Apparatus according to claim 1 further comprising a position encoder disposed on said vehicle, said position encoder generating an output signal when said vehicle has travelled a predetermined distance, said signal being supplied to said slave computer.

4. Apparatus according to claim 3 wherein said position encoder comprises an input shaft and a pinion gear affixed thereto, said pinion gear engaging with teeth in a rack located adjacent to said track, said input shaft thereby rotating as said vehicle moves on said track, said position encoder providing an output signal such as a pulse for a predetermined amount of rotation of said input shaft.

5. Apparatus according to claim 1 further comprising a track system and a host computer remote from said vehicle, said slave computer communicating with said host computer, said slave computer providing vehicle operating parameters to said host computer, said host computer providing vehicle control data to said slave computer.

6. Apparatus according to claim 4 wherein said slave computer communicates with said host computer via a bidirectional communications link comprising a pair of slideable contacts disposed on said vehicle, one end of said slideable contacts slideably and electrically communicating with a communications bus operatively connected to said host computer, the other end of said slideable contacts operatively connected to said slave computer.

7. Apparatus according to claim 1 further comprising a brake operatively affixed to said vehicle and communicating with said slave computer, said brake being responsive to stop said vehicle in response to signals from said slave computer.

8. Apparatus according to claim 1 wherein said drive wheel control means comprises a servo motor.

9. Apparatus according to claim 1 wherein said drive wheel control means comprises a constant speed clutch-brake motor.

10. A speed and position control system for vehicles adapted to ride on a track wherein each vehicle comprises:

(a) a drive wheel in rolling contact with a rotating drive shaft, said drive wheel being oscillatable between a drive position and an accumulation position;

(b) a slave computer;

(c) drive wheel control means having an output shaft movable in response to signals from said slave computer;

(d) a control linkage operatively connected to said drive wheel and to said output shaft of said drive wheel control means for oscillating said drive wheel means in response to the movement of said output shaft;

(e) means for generating a signal representative of a change of the position of said vehicle on said track, said track position signal being supplied to said slave computer;

said control system further comprising

(f) a host computer communicating with each slave computer via a bidirectional communications link;

whereby operating parameters such as speed and position are determined for each vehicle by its slave computer based upon said track position signal, said operating parameters being supplied to said host computer via said communications link, said host computer determining new vehicle operating parameters and communicating said new vehicle operating parameters to selected ones of said slave computers, each selected slave computer thereby supplying a signal to its associated drive wheel control means to adjust said vehicle operating parameters accordingly.

11. A speed and position control system according to claim 10 further comprising means connected to said output shaft of said drive wheel control for generating a signal representative of said drive wheel position.

12. A speed and position control system according to claim 10 wherein said means for generating a signal representative of a change of the position of said vehicle on said track comprises a position encoder disposed on said vehicle, said position encoder having an input shaft and a pinion gear affixed thereto, said pinion gear engaging with teeth in a rack located adjacent said track, said input shaft thereby rotating as said vehicle moves on said track and providing a signal such as a pulse when said vehicle has moved a predetermined distance.

13. A speed and position control system according to claim 10 wherein said bidirectional communications link comprises a pair of slideable contacts disposed on said vehicle, one end of said pair of slideable contacts slideably and electrically communicating with a communications bus adjacent said track and parallel therewith, said communications bus being operatively connected to said host computer, the other end of said pair of slideable contacts operatively connected to said slave computer.

14. A speed and position control system according to claim 13 wherein said communications bus comprises a pair of conductors and said communications link comprises a serial data communications link.

15. A speed and position control system according to claim 10 wherein each vehicle further comprises a brake operatively affixed to said vehicle and communicating with said slave computer, said brake being responsive to stop said vehicle according to signals provided by said slave computer.

16. A vehicle and track system comprising:

17. (a) a plurality of vehicles, each vehicle being mounted on wheels adapted to ride on a track;

(b) drive shaft means including a drive shaft disposed adjacent and parallel to said track, said drive shaft being rotatable about its longitudinal axis;

(c) drive wheel means mounted on each of said vehicles, said drive wheel means including a drive wheel in rolling contact with the periphery of said drive shaft, said drive wheel being oscillatable between a drive position and accumulation position;

(d) a plurality of slave computers, each vehicle having a slave computer associated therewith;

(e) a host computer communicating with each slave computer via a bidirectional communications link;

(f) drive wheel control means disposed on each vehicle, each drive wheel control means having an output shaft movable in response to signals from its slave computer;

(g) a control linkage disposed on each vehicle, each control linkage being operatively connected to said drive wheel means and to said output shaft for oscillating said drive wheel between said drive position and said accumulation position in response to the movement of said output shaft;

(h) a first position encoder disposed on each servo means for providing an output signal representative of said drive wheel position to said slave computer;

(i) a second position encoder disposed on each vehicle for generating an output signal representative of a change of position of said vehicle on said track, each second position encoder comprising an input shaft and a pinion gear affixed thereto, said pinion gear engaging with teeth in a rack located adjacent said track, said input shaft thereby rotating as said vehicle moves on said track, said second position encoder generating an output signal such as a pulse when said vehicle has travelled a predetermined distance;

whereby vehicle operating parameters such as the speed and position of each vehicle are provided to said host computer by each of said slave computers, said host computer keeping track of the operating parameters of each vehicle and computing new vehicle operating parameters for selected vehicles and providing said operating parameters to the appropriate ones of said slave computers, each of said slave computers supplying a signal to its drive wheel control means to adjust the operating parameters of its respective vehicle.