ISG control system for construction machine and ISG control method for construction machine

{
  "publication_number": "US11693419B2",
  "country": "US",
  "kind": "B2",
  "title": "ISG control system for construction machine and ISG control method for construction machine",
  "abstract": "The present disclosure relates to an ISG control system and an ISG control method for a construction machine capable of controlling ISG even in a working state of a construction machine, the ISG control system including: a surrounding environment determinator configured to determine surrounding environment of the construction machine; and a vehicle controller configured to determine whether the construction machine is in a working state or a traveling state based on a determination result from the surrounding environment determinator, wherein the vehicle controller controls an engine based on a preset work ISG condition when it is determined that the construction machine is in the working state, and wherein the vehicle controller controls the engine based on a preset travel ISG condition when it is determined that the construction machine is in the traveling state.",
  "claims": [
    "1. An ISG (Idle Stop and Go) control system for a construction machine, comprising: a surrounding environment determinator configured to determine surrounding environment of the construction machine; and a vehicle controller configured to determine whether the construction machine is in a working state or a traveling state based on a determination result from the surrounding environment determinator, wherein the vehicle controller controls an engine based on a preset work ISG condition when it is determined that the construction machine is in the working state, wherein the vehicle controller controls the engine based on a preset travel ISG condition when it is determined that the construction machine is in the traveling state, wherein the surrounding environment determinator photographs the surrounding environment of the construction machine and transmits image information of the photographed surrounding environment to the vehicle controller, when the image information includes a lane around the construction machine, the vehicle controller determines that the construction machine is currently in the traveling state, wherein the vehicle controller determines that an engine auto-stop entry condition of the work ISG condition is satisfied under conditions that the construction machine is in the working state, an ISG cut-off switch of the construction machine is in an off state, the engine is maintained at 800 rpm or more for at least 10 seconds, a temperature of an engine coolant of the construction machine is greater than 60 degrees Celsius, a battery charge amount of the construction machine is greater than 75%, a battery temperature of the construction machinery is greater than 0 degrees Celsius and less than 55 degrees Celsius, and a temperature in a cab of the construction machine is greater than 15 degrees Celsius and less than 27 degrees Celsius.",
    "2. The ISG control system for the construction machine of claim 1, wherein the vehicle controller determines that the construction machine is in the working state when the surrounding environment determinator determines that a location where the construction machine is located is an indoor space or a preset workplace.",
    "3. The ISG control system for the construction machine of claim 1, wherein the vehicle controller determines that the construction machine is in the traveling state when the surrounding environment determinator determines that the lane exists around the construction, and when a vehicle speed of the construction machine exceeds a preset reference speed.",
    "4. An ISG (Idle Stop and Go) control system for a construction machine, comprising: a surrounding environment determinator configured to determine surrounding environment of the construction machine; and a vehicle controller configured to determine whether the construction machine is in a working state or a traveling state based on a determination result from the surrounding environment determinator, wherein the vehicle controller controls an engine based on a preset work ISG condition when it is determined that the construction machine is in the working state, wherein the vehicle controller controls the engine based on a preset travel ISG condition when it is determined that the construction machine is in the traveling state, and wherein the vehicle controller determines that an engine auto-stop entry condition of the work ISG condition is satisfied under conditions that the construction machine is in the working state, an ISG cut-off switch of the construction machine is in an off state, the engine is maintained at 800 rpm or more for at least 10 seconds, a temperature of an engine coolant of the construction machine is greater than 60 degrees Celsius, a battery charge amount of the construction machine is greater than 75%, a battery temperature of the construction machinery is greater than 0 degrees Celsius and less than 55 degrees Celsius, and a temperature in a cab of the construction machine is greater than 15 degrees Celsius and less than 27 degrees Celsius.",
    "5. The ISG control system for the construction machine of claim 4, wherein the vehicle controller determines that an engine auto-stop condition of the work ISG condition is satisfied under conditions that the construction machine is located on a level ground, the construction machine is in a no-load state, an air conditioner of the construction machine operates at a level less than a maximum level, a heater of the construction machine operates at a level less than a maximum level, a displacement of an accelerator pedal of the construction machine is less than 5%, a speed of the construction machine is 0, a work device lever of the construction machine is in an off state, and an inching pedal of the construction machine is in an off state, a parking brake of the construction machine is maintained in an on state for 5 seconds or more, a seat of the construction machine is maintained in an unseated state for 5 seconds or more, or a gear of the construction machine is maintained in a neutral state for 5 seconds or more.",
    "6. The ISG control system for the construction machine of claim 5, wherein the vehicle controller determines that an engine restart entry condition of the work ISG condition is satisfied, when a revolution number of the engine is 0 after the engine auto-stop condition of the work ISG condition is satisfied and the engine is stopped, and the seat is maintained in a seated state.",
    "7. The ISG control system for a construction machine of claim 6, wherein the vehicle controller determines that an engine forced-restart condition of the work ISG condition is satisfied under conditions that the battery charge amount is less than 75%, a charge pressure of a brake of the construction machine is less than 100 bar, the temperature in the cab is greater than 27 degrees Celsius, the temperature in the cab is less than 15 degrees Celsius, the temperature of the engine coolant is less than 60 degrees Celsius, the battery temperature is less than 0 degrees Celsius, or the battery temperature is greater than 55 degrees Celsius.",
    "8. The ISG control system for the construction machine of claim 7, wherein the vehicle controller determines that an engine auto-restart condition of the work ISG condition is satisfied under conditions that the brake is in an on state, the work device lever of the construction machine is operated, or the inching pedal is in an on state.",
    "9. The ISG control system for the construction machine of claim 1, wherein the vehicle controller determines that an engine auto-stop entry condition of the travel ISG condition is satisfied under conditions that the construction machine is in the traveling state, an ISG cut-off switch of the construction machine is in an off state, the engine is maintained at 800 rpm or more for 10 seconds or longer, a temperature of an engine coolant of the construction machine is greater than 60 degrees Celsius, a battery charge amount of the construction machine is greater than 75%, a battery temperature of the construction machinery is greater than 0 degrees Celsius and less than 55 degrees Celsius, and a temperature in a cab of the construction machine is greater than 15 degrees Celsius and less than 27 degrees Celsius.",
    "10. The ISG control system for the construction machine of claim 9, wherein the vehicle controller determines that an engine auto-stop condition of the travel ISG condition is satisfied under conditions that the construction machine is located on a level ground, the construction machine is in a no-load state, an air conditioner of the construction machine operates at a level less than a maximum level, a heater of the construction machine operates at a level less than a maximum level, a gear of the construction machine is positioned in either forward or neutral, a displacement of an accelerator pedal of the construction machine is less than 5%, a brake of the construction machine is in an on state, and a vehicle speed of the construction machine is 0.",
    "11. The ISG control system for the construction machine of claim 10, wherein after the engine auto-stop condition is satisfied and the engine is stopped, when a revolution number of the engine is 0, and the seat is maintained in a seated state, the vehicle controller determines that an engine restart entry condition of the travel ISG condition is satisfied.",
    "12. The ISG control system for a construction machine of claim 11, wherein the vehicle controller determines that an engine forced-restart condition of the travel ISG condition is satisfied under conditions that the battery charge amount is less than 75%, a charge pressure of the brake of the construction machine is less than 100 bar, the temperature in the cab is greater than 27 degrees Celsius, the temperature in the cab is less than 15 degrees Celsius, the temperature of the engine coolant is less than 60 degrees Celsius, the battery temperature is less than 0 degrees Celsius, or the battery temperature is greater than 55 degrees Celsius.",
    "13. The ISG control system for the construction machine of claim 12, wherein the vehicle controller determines that an engine auto-restart condition of the travel ISG condition is satisfied when the brake is in an off state.",
    "14. A method of controlling ISG of a construction machine, the method comprising: determining surrounding environment of the construction machine; and determining whether the construction machine is in a working state or a traveling state based on a determination result of the surrounding environment, wherein the vehicle controller controls an engine based on a preset work ISG condition when it is determined that the construction machine is in the working state, and wherein the vehicle controller controls the engine based on a preset travel ISG condition when it is determined that the construction machine is in the traveling state, wherein the determining surrounding environment of the construction machine comprises photographing the surrounding environment of the construction machine and transmitting image information of the photographed surrounding environment to the vehicle controller, when the image information includes a lane around the construction machine, the vehicle controller determines that the construction machine is currently in the traveling state wherein the vehicle controller determines that an engine auto-stop entry condition of the work ISG condition is satisfied under conditions that the construction machine is in the working state, an ISG cut-off switch of the construction machine is in an off state, the engine is maintained at 800 rpm or more for at least 10 seconds, a temperature of an engine coolant of the construction machine is greater than 60 degrees Celsius, a battery charge amount of the construction machine is greater than 75%, a battery temperature of the construction machinery is greater than 0 degrees Celsius and less than 55 degrees Celsius, and a temperature in a cab of the construction machine is greater than 15 degrees Celsius and less than 27 degrees Celsius.",
    "15. The method of controlling ISG of the construction machine of claim 14, wherein the work ISG condition comprises an engine stop entry condition, an engine stop condition, an engine restart entry condition, an engine forced-restart condition, and an engine auto-restart condition, and the travel ISG condition comprises an engine stop entry condition, an engine stop condition, an engine restart entry condition, an engine forced-restart condition, and an engine auto-restart condition.",
    "16. The method of controlling ISG of the construction machine of claim 15, wherein the step of controlling of the engine based on the work ISG condition when it is determined that the construction machine is in the working state comprises: determining whether the engine stop entry condition of the work ISG condition is satisfied; determining whether the engine stop condition of the work ISG condition is satisfied when the engine stop entry condition of the work ISG condition is satisfied; stopping the engine when the engine stop condition of the work ISG condition is satisfied; determining whether the engine restart entry condition of the work ISG condition is satisfied; determining whether the engine forced-restart condition of the work ISG condition is satisfied when the engine restart entry condition of the work ISG condition is satisfied; determining whether the engine auto-restart condition of the work ISG condition is satisfied when the engine forced-restart condition of the work ISG condition is not satisfied; and restarting the engine when the engine auto-restart condition of the work ISG condition is satisfied.",
    "17. The method of controlling ISG of the construction machine of claim 15, wherein the step of controlling of the engine based on the travel ISG condition when it is determined that the construction machine is in the traveling state comprises: determining whether the engine stop entry condition of the travel ISG condition is satisfied; determining whether the engine stop condition of the travel ISG condition is satisfied when the engine stop entry condition of the travel ISG condition is satisfied; stopping the engine when the engine stop condition of the travel ISG condition is satisfied; determining whether the engine restart entry condition of the travel ISG condition is satisfied; determining whether the engine forced-restart condition of the travel ISG condition is satisfied when the engine restart entry condition of the travel ISG condition is satisfied; determining whether the engine auto-restart condition of the travel ISG condition is satisfied when the engine forced-restart condition of the travel ISG condition is not satisfied; and restarting the engine when the engine auto-restart condition of the travel ISG condition is satisfied."
  ],
  "description_excerpt": "Embodiments of the present disclosure relate to an ISG (Idle Stop and Go) control system for a construction machine, and more particularly, to an ISG control system for a construction machine capable of controlling ISG even in a working state of the construction machine and to an ISG control method for a construction machine.\n\nRecently, various efforts are made for vehicles to reduce greenhouse gases, and as part of them, various methods to improve fuel economy are being sought. In order to improve fuel economy, an ISG system is being widely used globally. The ISG system receives information on, for example, vehicle speed, engine revolution speed, and coolant temperature and prevents fuel consumption by stopping an engine when idle.\n\nThat is, when, for example, a vehicle stops and waits for a signal, the ISG system automatically stops an idling engine, and after a predetermined time, restarts the engine at the driver's request by controlling, for example, an accelerator and a brake pedal. The ISG system may achieve a fuel economy effect of about 5 to 15% in an actual fuel economy mode.\n\nFor example, Korean Patent Laid-Open No. 10-2012-0062559 (published on Jun. 14, 2012) discloses a technology that may substantially prevent unnecessary fuel consumption due to idling by controlling the start-up of the engine according to engine stop conditions and engine restart conditions for automatic transmission vehicles.",
  "cpc": [
    "G05D 1/0223",
    "B60W 10/06",
    "B60W 30/18009",
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    "F02D 2200/023",
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  "ipc": [
    "G01C 21/34",
    "G05D 1/02",
    "G06V 20/56"
  ],
  "assignees": [
    "Doosan Industrial Vehicle Co Ltd"
  ],
  "inventors": [
    "Hyunkyu KANG",
    "Jinsan SONG",
    "Semin PARK"
  ],
  "filing_date": "2021-03-31",
  "publication_date": "2023-07-04",
  "grant_date": "2023-07-04",
  "priority_date": "2020-06-25",
  "application_number": "US-202117218585-A",
  "family_id": "76942757",
  "cited_by_count": 0,
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    "US20090163226A1",
    "JP2014009078A",
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    "US20150159613A1",
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  ]
}