Systems and methods for resetting a pressure relief valve of a common rail fuel system

A common rail fuel system of an engine system, comprising:

• a fuel pump,
• a fuel rail,
• a plurality of fuel injectors,
• a pressure-responsive pressure relief valve fluidly coupled to the fuel rail, and
• a controller configured to:
• identify a pressure condition of the fuel rail indicative of the pressure-responsive relief valve being in an open and latched condition, the identification being based on detecting a rise and reduction in rail pressure, wherein identifying the pressure condition includes:
• detecting the reduction in the rail pressure of the fuel rail;
• and
• determining whether the reduction in the rail pressure was caused by a high pressure rail event or a low pressure rail event;
• in response to determining that the reduction in the rail pressure was caused by a high pressure rail event, terminate flow from the fuel pump and derate the engine system to a first derate level while the engine system continues to operate;
• and
• in response to determining that the reduction in the rail pressure was caused by a low pressure rail event, derate the engine system to a second derate level that is greater than the first derate level and limits an output of the engine system more than the first derate level while the engine system continues to operate.

A method of controlling a common rail fuel system of an engine system, the common rail fuel system having a fuel pump, a fuel rail, a plurality of fuel injectors, and a pressure-responsive relief valve fluidly coupled to the fuel rail, the method comprising:

• identifying a pressure condition of the fuel rail indicative of the pressure-responsive relief valve being in an open and latched condition, the identification being based on detecting a rise and subsequent reduction in rail pressure, wherein identifying the pressure condition includes:
• detecting the reduction in the rail pressure of the fuel rail;
• and
• determining whether the reduction in the rail pressure was caused by a high pressure rail event or a low pressure rail event;
• determining whether the rail pressure is maintained within a range of pressure values after the reduction in rail pressure;
• and
• in response to determining that the rail pressure is maintained within the range of pressure values, terminating flow from the fuel pump.