Hybrid control method for fuel pump using intermittent recirculation at low and high engine speeds
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United States of America Patent
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Feb 24, 2004
Grant Date -
Nov 28, 2002
app pub date -
Jul 2, 2002
filing date -
Feb 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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. At least two control regimes are established corresponding to a respective low engine speed pump operation and high engine speed pump operation. During low speed operation, unregulated low pressure fuel is fed to the pumping pistons and at a location between the pistons and the common rail, excess fuel discharged from the pistons is diverted to a location of relatively low pressure in the fuel supply system, upstream of the pistons. During high-speed operation, the quantity of low pressure feed fuel pressurized by the pumping pistons is regulated and all of the fuel discharged from the pistons is delivered to the common rail.
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