Hybrid industrial vehicle

{
  "publication_number": "US9312685B2",
  "country": "US",
  "kind": "B2",
  "title": "Hybrid industrial vehicle",
  "abstract": "A hybrid industrial vehicle (1) has as a main configuration: an engine (2); a cargo handling generator motor (3) used for cargo handling; a cargo handling apparatus (4) that can be driven by power received from both the engine (2) and the cargo handling generator motor (3); and a hybrid control system (8). The hybrid control system (8) suppresses an output of the cargo handling generator motor (3) according to a temperature of the cargo handling generator motor (3) during powering of the cargo handling generator motor (3), and suppresses a regeneration amount of the cargo handling generator motor (3) according to the temperature of the cargo handling generator motor (3) during regeneration of the cargo handling generator motor (3).",
  "claims": [
    "1. A hybrid industrial vehicle comprising: an engine; a cargo handling generator motor used for cargo handling; a cargo handling unit that can be driven by power received from both the engine and the cargo handling generator motor; a battery; and a control unit, wherein the control unit reduces an output of the cargo handling generator motor according to a temperature of the cargo handling generator motor during powering of the cargo handling generator motor where electric power is supplied from the battery to the cargo handling generator motor, and reduces a regeneration amount by the cargo handling generator motor according to the temperature of the cargo handling generator motor during regeneration of the cargo handling generator motor.",
    "2. The hybrid industrial vehicle according to claim 1, wherein the control unit changes a power distribution ratio of the engine and the cargo handling generator motor according to the temperature of the cargo handling generator motor during powering of the cargo handling generator motor, and changes a braking force distribution ratio by a braking unit and the cargo handling generator motor according to the temperature of the cargo handling generator motor during regeneration of the cargo handling generator motor.",
    "3. The hybrid industrial vehicle according to claim 2, wherein the control unit calculates a parameter relating to the temperature of the cargo handling generator motor using at least any one of the temperature of the cargo handling generator motor, a temperature change rate of the cargo handling generator motor, a cargo load weight, and a cargo handling manipulation frequency, and suppresses power and a braking force of the cargo handling generator motor according to the parameter.",
    "4. The hybrid industrial vehicle according to claim 2, comprising a cooling unit that cools the generator motor, wherein if the temperature of the cargo handling generator motor exceeds a previously set predetermined threshold value, an output of the cooling unit is increased.",
    "5. The hybrid industrial vehicle according to claim 1, comprising a traveling generator motor capable of supplying power to the cargo handling unit, wherein the control unit decreases power supply of the cargo handling generator motor according to the temperature of the cargo handling generator motor during powering of the cargo handling generator motor, compensates the decrement with power of the traveling generator motor, decreases the regeneration amount of the cargo handling generator motor according to the temperature of the cargo handling generator motor during regeneration of the cargo handling generator motor, and regenerates the decrement by the traveling generator motor.",
    "6. The hybrid industrial vehicle according to claim 5, wherein the control unit calculates a parameter relating to the temperature of the cargo handling generator motor using at least any one of the temperature of the cargo handling generator motor, a temperature change rate of the cargo handling generator motor, a cargo load weight, and a cargo handling manipulation frequency, and suppresses power and a braking force of the cargo handling generator motor according to the parameter.",
    "7. The hybrid industrial vehicle according to claim 5, comprising a cooling unit that cools the generator motor, wherein if the temperature of the cargo handling generator motor exceeds a previously set predetermined threshold value, an output of the cooling unit is increased.",
    "8. The hybrid industrial vehicle according to claim 1, wherein the control unit calculates a parameter relating to the temperature of the cargo handling generator motor using at least any one of the temperature of the cargo handling generator motor, a temperature change rate of the cargo handling generator motor, a cargo load weight, and a cargo handling manipulation frequency, and suppresses power and a braking force of the cargo handling generator motor according to the parameter.",
    "9. The hybrid industrial vehicle according to claim 8, comprising a cooling unit that cools the generator motor, wherein if the temperature of the cargo handling generator motor exceeds a previously set predetermined threshold value, an output of the cooling unit is increased.",
    "10. The hybrid industrial vehicle according to claim 1, comprising a cooling unit that cools the generator motor, wherein if the temperature of the cargo handling generator motor exceeds a previously set predetermined threshold value, an output of the cooling unit is increased."
  ],
  "description_excerpt": "The present invention relates to hybrid industrial vehicles, such as a forklift.\n\nIn order to improve fuel consumption of industrial vehicles, there has been known a hybrid industrial vehicle whose power is supplied from a motor generator in addition to an engine. Generally, the hybrid industrial vehicle can store regeneration energy of a generator motor in a battery, and can reuse it at the time of powering.\n\nIn such hybrid industrial vehicle, extreme decrease and increase of a charging rate of a battery reduce a battery life, and thus it is known to appropriately manage the charging rate of the battery (for example, refer to PTL 1).\n\nFor example, in PTL 1, a technique has been disclosed that detects a charging rate and a battery temperature, and controls discharge allowable electric power in order to protect a battery in a hybrid industrial vehicle.\n\nSpecifically, PTL 1 discloses to use a smaller set value of the discharge allowable electric power from the battery when the battery temperature is low as well as when it is high, or the charging rate is small.\n\nthe Publication of Japanese Examined Utility Model Registration No. 3156582\n\nAlthough a damage to the battery can be avoided by the technique disclosed in PTL 1, components other than a battery also need to be considered to operate an actual hybrid industrial vehicle.",
  "cpc": [
    "H02H 7/0852",
    "B60L 1/003",
    "B60L 2200/40",
    "B60L 2200/42",
    "B60L 2240/36",
    "B60L 7/26",
    "B60W 10/06",
    "B60W 10/08",
    "B60W 10/18",
    "B60W 10/30",
    "B60W 20/00",
    "B60W 20/108",
    "B60W 20/15",
    "B60W 2300/121",
    "B60W 2510/087",
    "B60W 2510/18",
    "B60W 30/18127",
    "B60W 30/1843",
    "B66F 9/07572",
    "B66F 9/24",
    "H02H 7/0822",
    "Y02P 90/60",
    "Y02T 10/62"
  ],
  "ipc": [
    "B60W 10/06",
    "B60W 10/08",
    "B60W 10/18",
    "B60W 10/30",
    "B60W 20/00",
    "B60W 30/18",
    "B60W 30/184",
    "B66F 9/075",
    "H02H 7/08",
    "H02H 7/085"
  ],
  "assignees": [
    "Mitsubishi Nichiyu Forklift Co Ltd"
  ],
  "inventors": [
    "Yusuke Kinouchi",
    "Kensuke Futahashi",
    "Kiyomitsu Ogawa"
  ],
  "filing_date": "2012-02-17",
  "publication_date": "2016-04-12",
  "grant_date": "2016-04-12",
  "priority_date": "2011-04-28",
  "application_number": "US-201214113139-A",
  "family_id": "47071921",
  "cited_by_count": 2,
  "citations": [
    "DE102004040315A1",
    "DE102005003881A1",
    "JP2007168502A",
    "US8040083B2",
    "US20080041653A1",
    "US7615951B2",
    "EP1920987A2",
    "US7702432B2",
    "JP2008260428A",
    "US20100025167A1",
    "JP2010213461A",
    "JP2010241322A",
    "JP2010260477A",
    "JP2011051661A",
    "JP3156582U"
  ]
}