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Hybrid control method for fuel pump using intermittent recirculation at low and high engine speeds

  • US 6,694,950 B2
  • Filed: 07/02/2002
  • Issued: 02/24/2004
  • Est. Priority Date: 02/17/1999
  • Status: Expired due to Fees
First Claim
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1. In a fuel supply system for an internal combustion engine, a method for controlling fuel quantity delivery from a high pressure, reciprocating piston, engine-driven fuel pump to a high pressure common rail having a plurality of fuel injection nozzles for injecting fuel into the cylinders of the engine, comprising:

  • establishing at least two control regimes corresponding to a respective low engine speed pump operation and high engine speed pump operation;

    during the control regime for low speed operation, feeding unregulated low pressure fuel to the pumping pistons and at a location between the pumping pistons and the common rail, diverting excess fuel discharged from the pumping pistons to a location of relatively low pressure in the fuel supply system, upstream of the pumping pistons; and

    during the control regime for high-speed operation, regulating the quantity of low pressure feed fuel pressurized by the pumping pistons and delivering all of the fuel discharged from the pumping pistons, to the common rail.

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