Feedback control method for a fuel delivery system

{
  "publication_number": "US10247126B2",
  "country": "US",
  "kind": "B2",
  "title": "Feedback control method for a fuel delivery system",
  "abstract": "A feedback control method for a fuel delivery system of an internal combustion engine, having a fuel delivery pump for supplying fuel, the fuel delivery pump having a pump mechanism driven by an electric motor, which is controlled by a generated control signal. The current fuel volume delivered by the fuel delivery pump and the prevailing fuel requirement of the internal combustion engine are included in the control signal. The prevailing fuel requirement is determined using characteristic variables that characterize the operating state of the internal combustion engine.",
  "claims": [
    "1. A feedback control method for a fuel delivery system of an internal combustion engine in a motor vehicle, having a fuel delivery pump that supplies the internal combustion engine with fuel, the fuel delivery pump has a pump mechanism driven by an electric motor, the electric motor controlled by a control signal, comprising: generating the control signal for the electric motor, wherein a current fuel volume delivered by the fuel delivery pump and a prevailing fuel requirement of the internal combustion engine are included in determining the control signal; determining the prevailing fuel requirement based at least in part on characteristic variables that characterize an operating state of at least one of the internal combustion engine and the motor vehicle; and calibrating the fuel delivery system, by: determining the actual fuel volume by a characteristic map using a current rotational speed and a current pressure applied to an inverse characteristic map; determining at least one of a comparative rotational speed and a comparative pressure from the inverse characteristic map; and determining a deviation between at least one of: the current rotational speed and the comparative rotational speed and the current pressure and the comparative pressure.",
    "2. The method as claimed in claim 1, further comprising: determining the current fuel volume delivered by the fuel delivery pump from a current pressure prevailing in the fuel delivery system and a current rotational speed of the pump mechanism of the fuel delivery pump based at least in part on at least one characteristic map.",
    "3. The method as claimed in claim 2, further comprising: determining the prevailing fuel requirement of the internal combustion engine based at least in part on at least one of: a gas pedal position, a charging pressure of a turbocharger, a rotational speed of the internal combustion engine, a delivered air mass, a fuel/air ratio in the internal combustion engine, a lambda value, and an air temperature.",
    "4. The method as claimed in claim 1, wherein the current fuel volume delivered by the fuel delivery pump is determined at a time at which a delivered current fuel volume is still unchanged in comparison with an already changed fuel requirement of the internal combustion engine.",
    "5. The method as claimed in claim 4, further comprising: determining a fuel volume setpoint to be delivered from a difference between the current fuel volume delivered by the fuel delivery pump and the fuel requirement of the internal combustion engine; and determining a rotational speed setpoint for the fuel delivery pump from the a fuel volume setpoint.",
    "6. The method as claimed in claim 5, wherein the fuel volume setpoint is processed with a pressure setpoint in the fuel delivery system to form the rotational speed setpoint.",
    "7. The method as claimed in claim 6, wherein the pressure setpoint in the fuel delivery system is determined by a differential value, input into a PID controller, between a default value for the pressure and a current pressure.",
    "8. The method as claimed in claim 5, further comprising: correcting the fuel volume setpoint by an offset value, wherein the offset value is caused by additional elements in the fuel delivery system.",
    "9. The method as claimed in claim 4, wherein the fuel requirement of the internal combustion engine changes before the current fuel volume delivered by the fuel delivery pump is changed."
  ],
  "description_excerpt": "The invention relates to a feedback control method for a fuel delivery system of an internal combustion engine in a motor vehicle, having a fuel delivery pump for supplying the internal combustion engine with fuel, where the fuel delivery pump has a pump mechanism driven by an electric motor, where the electric motor can be controlled by a control signal, where a control signal for the control of the electric motor is generated.\n\nThe fuel delivery system in motor vehicles having an internal combustion engine must ensure an adequate delivery of fuel in a plurality of operating states of the motor vehicle, in order to ensure fault-free operation of the motor vehicle. In addition, different variants of the internal combustion engines increase the necessary flexibility here.\n\nIn order to control the fuel delivery system and in particular the fuel delivery pump, use is made of controllers, which are able to influence the volume of fuel delivered, the pressure in the fuel delivery system, and the rotational speed of the fuel delivery pump. For this purpose, the controllers must have a suitable response to setpoint changes and in particular a good response to incidents to be able to compensate adequately for disruptive influences and special situations.\n\nTypical incidents include, for example, treading suddenly on the gas pedal and therefore abruptly increasing the fuel volume needed by the internal combustion engine. The control of the fuel delivery system must be able to compensate quickly for such a load step in order to ensure the most optimal operation possible of the internal combustion engine.",
  "cpc": [
    "F02D 41/3082",
    "F02D 2041/1409",
    "F02D 2200/0406",
    "F02D 2200/0414",
    "F02D 2200/0602",
    "F02D 2200/0616",
    "F02D 2200/101",
    "F02D 2200/602",
    "F02D 2250/31",
    "F02D 33/006",
    "F02D 41/1454",
    "F02D 41/18",
    "F02D 41/2409",
    "F02D 41/2432"
  ],
  "ipc": [
    "F02D 33/00",
    "F02D 41/30",
    "F02M 37/08"
  ],
  "assignees": [
    "Continental Automotive Technologies GmbH"
  ],
  "inventors": [
    "Gerald Behrendt"
  ],
  "filing_date": "2016-04-25",
  "publication_date": "2019-04-02",
  "grant_date": "2019-04-02",
  "priority_date": "2015-04-27",
  "application_number": "US-201615569692-A",
  "family_id": "55858755",
  "cited_by_count": 4,
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}