Automatic guided vehicle and automatic guided vehicle control method
First Claim
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1. A vehicle control method for controlling a direction of a self drive vehicle by differentially driving electric motors for driving right and left drive wheels, said vehicle control method comprising the steps of:
- detecting a lateral deviation of said self drive vehicle from a prearranged travel path which is established by guide means;
calculating a speed difference between rotational speeds of said electric motors necessary to correct said lateral deviation; and
applying reverse torque to said electric motors according to said speed difference to differentially drive said right and left wheels.
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Abstract
A automatic guided vehicle which drives drive wheels differentially to change its traveling direction applies braking by imposing reverse torque to wheel drive motors when cornering or when rapid braking is demanded. This braking corrects the traveling direction of the automatic guided vehicle when the vehicle is apt to depart from its intended path, enabling a automatic guided vehicle even having a large inertia to make a smooth turn at a sharp corner.
53 Citations
32 Claims
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1. A vehicle control method for controlling a direction of a self drive vehicle by differentially driving electric motors for driving right and left drive wheels, said vehicle control method comprising the steps of:
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detecting a lateral deviation of said self drive vehicle from a prearranged travel path which is established by guide means; calculating a speed difference between rotational speeds of said electric motors necessary to correct said lateral deviation; and applying reverse torque to said electric motors according to said speed difference to differentially drive said right and left wheels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A vehicle control system for controlling a self-drive vehicle which is guided by path guide means to travel on a prearranged travel path established by said path guide means and controlling a traveling direction of said self-drive vehicle by driving right and left drive wheels at different speeds, said vehicle control system comprising:
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electric motors for driving said right and left drive wheels, respectively; and control means for detecting whether there is a demand of deceleration, detecting a lateral deviation of said self-drive vehicle from said path guide means and controlling regenerated energy of said electric motor according to said lateral deviation when said deceleration demand is detected. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A vehicle control method for controlling a direction of a automatic guided vehicle by differentially driving motors for driving right and left drive wheels, said vehicle control method comprising the steps of:
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detecting a lateral deviation of said automatic guided vehicle from a prearranged travel path; calculating a speed difference between rotational speeds of said motors necessary to correct said lateral deviation; applying reverse torque to said motors according to said speed difference to differentially drive said right and left wheels; and controlling a speed of said automatic guided vehicle by a forward drive control map prescribing a relationship between lateral deviation and motor speed.
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30. A vehicle control method for controlling a direction of a automatic guided vehicle by differentially driving motors for driving right and left drive wheels, said vehicle control method comprising the steps of:
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detecting a lateral deviation of said automatic guided vehicle from a prearranged travel path; calculating a speed difference between rotational speeds of said motors necessary to correct said lateral deviation; applying reverse torque to said motors according to said speed difference to differentially drive said right and left wheels; and controlling a speed of said automatic guided vehicle by a backward drive control map prescribing a relationship between lateral deviation and motor speed.
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31. A vehicle control system for controlling a automatic guided vehicle which is guided by path guide means to travel on a prearranged path established by said path guide means and controlling a traveling direction of said automatic guided vehicle by driving right and left drive wheels at different speeds, said vehicle control system comprising:
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motors for driving said right and left drive wheels, respectively; control means for detecting whether there is a demand of deceleration, detecting a lateral deviation of said automatic guided vehicle from said path guide means and controlling regenerated energy of said motor according to said lateral deviation when said deceleration demand is detected; and wherein said control means controls said motor by a drive control map prescribing a relationship between lateral deviation and motor speed and a brake control map prescribing a relationship between lateral deviation and controlled braking variable which are selectively used.
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32. A vehicle control system for controlling a automatic guided vehicle which is guided by path guide means to travel on a prearranged path established by said path guide means and controlling a traveling direction of said automatic guided vehicle by driving right and left drive wheels at different speeds, said vehicle control system comprising:
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motors for driving said right and left drive wheels, respectively; and control means for detecting whether there is a demand of deceleration, detecting a lateral deviation of said automatic guided vehicle from said path guide means and controlling regenerated energy of said motor according to said lateral deviation when said deceleration demand is detected; and wherein said control means controls said motor by a forward drive control map prescribing a relationship between lateral deviation and motor speed, a backward drive control map prescribing a relationship between lateral deviation and motor speed, and a brake control map prescribing a relationship between lateral deviation and controlled braking variable which are selectively used.
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Specification