Method and system for controlling engine speed and boom-type engineering machine

{
  "publication_number": "US9194139B2",
  "country": "US",
  "kind": "B2",
  "title": "Method and system for controlling engine speed and boom-type engineering machine",
  "abstract": "The disclosure relates generally to the field of boom-type engineering machinery, which discloses particularly an engine speed control method used to control an output speed of an engine of a boom-type engineering machine during a boom action including: detecting a load pressure of a hydraulic system and a moving speed of a boom; determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; and sending, by the central control unit, the target speed of the engine to an engine control unit, and performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine. Further aspects are an engine speed control system and a boom-type engineering machine equipped therewith.",
  "claims": [
    "1. A method of controlling engine speed, used to control an output speed of an engine of a boom-type engineering machine during a boom action, comprising: (a) detecting a load pressure of a hydraulic system and a moving speed of a boom; (b) determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; (c) sending, by the central control unit, the target speed of the engine to an engine control unit; and (d) performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine, wherein the step of determining the target speed of the engine according to the load pressure and the moving speed of the boom, by the central control unit, comprises: calculating an engine initial control speed which matches the load pressure and the moving speed of the boom according to a power matching model and a flow matching model; and determining the target speed of the engine according to the engine initial control speed; wherein the moving speed of the boom is obtained by a push rod amplitude and a shift of a boom remote controller; and wherein the engine initial control speed, the load pressure, and the push rod amplitude meet the relationship of: n=f (P,q,T 0,T 1,... T n), wherein n is the engine initial control speed; P is the load pressure; q is a hydraulic pump displacement; T 0 is the push rod amplitude corresponding to a rotating boom; T 1 is a push rod amplitude corresponding to a first boom section; and T n is a push rod amplitude corresponding to an n th boom section.",
    "2. The method according to claim 1, wherein the load pressure is detected by a pressure sensor installed in the hydraulic system.",
    "3. A method of controlling engine speed, used to control an output speed of an engine of a boom-type engineering machine during a boom action, comprising: (a) detecting a load pressure of a hydraulic system and a moving speed of a boom; (b) determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; (c) sending, by the central control unit, the target speed of the engine to an engine control unit; and (d) performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine, wherein the step of determining the target speed of the engine according to the load pressure and the moving speed of the boom, by the central control unit, comprises: calculating an engine initial control speed which matches the load pressure and the moving speed of the boom according to a power matching model and a flow matching model; and determining the target speed of the engine according to the engine initial control speed; wherein the target speed of the engine is the initial control speed of the engine; or, the central control unit acquires an engine segment speed corresponding to the engine initial control speed, and the target speed of the engine is the engine segment speed; wherein the moving speed of the boom is obtained by a push rod amplitude and a shift of a boom remote controller; and wherein the engine initial control speed, the load pressure, and the push rod amplitude meet the relationship of: n=f (P,q,T 0,T 1... T n), wherein n is the engine initial control speed; P is the load pressure; q is a hydraulic pump displacement; T 0 is the push rod amplitude corresponding to a rotating boom; T 1 is a push rod amplitude corresponding to a first boom section; and T n is a push rod amplitude corresponding to an n th boom section.",
    "4. The method according to claim 3, wherein the load pressure is detected by a pressure sensor installed in the hydraulic system.",
    "5. A system of controlling engine speed, usable in a boom-type engineering machine, comprising: a central control unit; and an engine control unit, wherein the central control unit is configured to detect a load pressure of a hydraulic system and a moving speed of a boom, to determine a target speed of an engine according to the load pressure and the boom speed, comprising: calculating an engine initial control speed which matches the load pressure and the moving speed of the boom according to a power matching model and a flow matching model; and determining the target speed of the engine according to the engine initial control speed; and to send the target speed of the engine to the engine control unit; and wherein the engine control unit is configured to perform a speed closed-loop adjustment according to a current speed value fed back by the engine so that a current speed of the engine is consistent with the target speed of the engine; wherein the moving speed of the boom is obtained by a push rod amplitude and a shift of a boom remote controller; and wherein the engine initial control speed, the load pressure, and the push rod amplitude meet the relationship of: n=f (P,q,T 0,T 1,... T n), wherein n is the engine initial control speed; P is the load pressure; q is a hydraulic pump displacement; T 0 is the push rod amplitude corresponding to a rotating boom; T 1 is a push rod amplitude corresponding to a first boom section; and T n is a lush rod amplitude corresponding to an n th boom section.",
    "6. The system according to claim 5, further comprising: a pressure sensor configured to detect the load pressure of the hydraulic system, wherein the pressure sensor is installed in the hydraulic system.",
    "7. The system according to claim 5, wherein the boom-type engineering machine is a concrete pump vehicle, a spreader, an all-terrain crane or a truck crane."
  ],
  "description_excerpt": "The present disclosure relates generally to the field of boom-type engineering machinery, and more particularly to an engine speed control method utilized to control an output speed of an engine of a boom-type engineering machine during a boom action, an engine speed control system and a boom-type engineering machine with the engine speed control system.\n\nA concrete pump vehicle is a common boom-type engineering machine. A concrete pump vehicle is widely used in modern construction engineering such as developing urban, transportation, and national defense facilities. The economic efficiency of a concrete pump vehicle directly decides the construction cost and the severity of environmental pollution. As nowadays the ideas of energy conservation and environmental protection are widely and increasingly acknowledged, highly-efficient, energy-conserving, and environmentally-friendly concrete pump vehicle products become more and more favored.\n\nIn a concrete pump vehicle, a power system transfers the power of an engine to a hydraulic pump unit through a power transfer case, a portion of the hydraulic oil discharged from a hydraulic pump drives a concrete pump to work, and another portion of the hydraulic oil is used to drive boom sections of a boom structure to perform an action.\n\nConventionally, when a boom of a concrete pump vehicle performs an action, a control mode for an engine power system makes an engine to work at a rated speed.",
  "cpc": [
    "E04G 21/04",
    "B66C 13/18",
    "F02D 29/00",
    "F02D 29/02",
    "F02D 29/04",
    "F02D 31/001",
    "F02D 41/021"
  ],
  "ipc": [
    "B66C 13/18",
    "E04G 21/04",
    "F02D 31/00",
    "F02D 41/02",
    "G06F 7/70"
  ],
  "assignees": [
    "Hunan Sany Intelligent Control Equipment Co Ltd",
    "Sany Heavy Industry Co Ltd"
  ],
  "inventors": [
    "Xiaogang Yi",
    "Dongliang Pu",
    "Qiang Liu"
  ],
  "filing_date": "2013-12-26",
  "publication_date": "2015-11-24",
  "grant_date": "2015-11-24",
  "priority_date": "2011-06-28",
  "application_number": "US-201314141012-A",
  "family_id": "45860111",
  "cited_by_count": 0,
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    "US20080162005A1",
    "CN101835968A",
    "US20100262353A1",
    "CN102392747A"
  ]
}