Communicating method between master communication device and slave communication device for controlling cripper-unit in hoist device of rail car

{
  "publication_number": "US10491268B2",
  "country": "US",
  "kind": "B2",
  "title": "Communicating method between master communication device and slave communication device for controlling cripper-unit in hoist device of rail car",
  "abstract": "A communicating method between a master and a slave connected through a belt connected to a gripper-unit in a hoist device of a rail car, and to technology in which the master and the slave perform power line communication through a power supply line for supplying power formed in a belt, thereby more stably transmitting and receiving signals in a simple system structure.",
  "claims": [
    "1. A communicating method between a master communication device and a slave communication device for controlling a gripper-unit in a hoist device of a rail car, in which the master communication device connected to a rail car controller and the slave communication device connected to the gripper-unit are connected through a belt to operate the gripper-unit in accordance with a control signal of the rail car controller, thereby performing a hoist work, the communicating method comprising: a first step in which the master communication device provides power supplied from the rail car controller to the slave communication device through a power supply line formed in the belt, and the slave communication device supplies power provided from the master communication device to the gripper-unit; a second step in which the master communication device modulates the control signal provided from the rail car controller, overlaps the modulated control signal with power, and transmits the modulated control signal overlapped with the power to the slave communication device through the power supply line, and the slave communication device transmits a signal including a response to a control signal to the master communication device through the power supply line formed in the belt; and a third step in which the master communication device or the slave communication device compares voltage of the signal received through the power supply line with preset reference voltage to determine a communication state through the power supply line, and when it is determined as a communication abnormality state, communication abnormality state information is provided to the rail car controller through the master communication device.",
    "2. The communicating method according to claim 1, wherein in the second step, the master communication device or the slave communication device detects noise from the signal received through the power supply line, extracts a noise pattern according to a noise occurrence time point, and sets a section where noise does not occur to a signal transmission time point on a basis of the noise pattern to perform a signal transmission process through the power supply line.",
    "3. The communicating method according to claim 2, wherein in the second step, the master communication device or the slave communication device detects signal strength of noise, amplifies the signal to have a signal level higher than the signal strength of noise to perform the signal transmission process through the power supply line.",
    "4. The communicating method according to claim 2, wherein in the second step, when the noise pattern extracted in the master communication device is a pattern similar to a preset slip ring replacement pattern, slip ring replacement information is provided to the rail car controller.",
    "5. The communicating method according to claim 1, wherein in the first step, the master communication device detects a waveform of the power supplied from the rail car controller, compares the detected power waveform with a preset reference power waveform, stops, when the power waveform is not a normal power waveform, the supplying of the power to the slave communication device, and provides power abnormality state information to the rail car controller.",
    "6. The communicating method according to claim 1, wherein in the third step, the master communication device or the slave communication device determines the communication state on a basis of a signal fed back and received through the power supply line or provided from an opponent controller.",
    "7. The communicating method according to claim 1, wherein in the second step, the master communication device or the slave communication device adds CHECKSUM information for error detection for the signal to be transmitted through the power supply line, to the signal, and modulates and transmits the signal, and an opponent controller analyzes, when error occurs in the CHECKSUM information at the time of demodulating the received signal, a waveform of the received signal, extracts a noise position, and changes a data state of a bit corresponding to the noise position, thereby restores data.",
    "8. The communicating method according to claim 1, further comprising a step in which, in a state where the slave communication device is connected to one or more sensors including a gyro sensor and a tilt sensor in the hoist device and the gripper-unit and receives detection signals detected by the sensors, the slave communication device compares and determines, on a basis of detection signal provided from the sensor, a state of at least one of a belt movement distance, a belt movement speed, a left and right movement distance of the gripper-unit, a collision degree of the hoist device, and a tilt degree of the belt with preset reference information, and transmits work abnormality state information to the master communication device through the power supply line when difference from the reference information more than a predetermined range, and the master communication device transmits the work abnormality state information received from the slave communication device to the rail car controller.",
    "9. The communicating method according to claim 1, further comprising a step in which, in a state where each of the master communication device and the slave communication device is provided with a wireless communication module for performing wireless communication, in the third step, the master communication device or the slave communication device mutually transmits and receives the communication abnormality state information through the wireless communication modules at the time of determining the communication abnormality state through the power supply line."
  ],
  "description_excerpt": "The present invention relates to a communicating method between a master and a slave connected through a belt connected to a gripper-unit in a hoist device of a rail car, and to technology in which the master and the slave perform power line communication through a power supply line for supplying power formed in a belt, thereby more stably transmitting and receiving signals in a simple system structure.\n\nGenerally, in manufacturing processes of a semiconductor element and a liquid crystal display device etc., the manufacturing goods are transferred to the manufacturing equipment of each manufacturing process by using an automated material handling system (AMHS), so that the corresponding goods are manufactured according to the manufacturing processes of each manufacturing equipment. Such an automated material handling system utilizes a rail car for transferring a carrier of receiving a semiconductor substrate or a liquid crystal substrate to the manufacturing station located on the manufacturing process line and transferring the carrier of again receiving the goods completely processed in the corresponding manufacturing equipment to the next manufacturing equipment.\n\nDepending on the movement method thereof, the rail car includes an automated rail car (AGV) for driving through the wheel, a rail guided vehicle (RGV) for driving along the guide rail located at the bottom, and an overhead hoist transport (OHT) for driving a guide rail installed in the ceiling.",
  "cpc": [
    "H04B 3/54",
    "G08C 19/00",
    "H04B 15/005",
    "H04B 2203/5429",
    "H04B 3/46",
    "H04B 3/542",
    "H04B 3/544",
    "H04B 3/60"
  ],
  "ipc": [
    "H04B 15/00",
    "H04B 3/54",
    "H10P 72/30"
  ],
  "inventors": [
    "Hak Seo Oh",
    "Hyo Seok Park",
    "Sung Hyuk YOUN",
    "Youl Kwon Sung",
    "Sung Ik Kim",
    "Jin Hwan Ko"
  ],
  "filing_date": "2018-04-26",
  "publication_date": "2019-11-26",
  "grant_date": "2019-11-26",
  "priority_date": "2018-02-01",
  "application_number": "US-201815963300-A",
  "family_id": "66934340",
  "cited_by_count": 1,
  "citations": [
    "US20170117715A1",
    "US20170368611A1"
  ]
}