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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Liquid Fuel System Technical Information – Hybrid Electric Vehicle (HEV) Engine Shutdown When the unit is issued a shutdown command, or experiences a severity level 3 (or greater) fault other than a flameout, the unit performs a fuel purge of all injector fuel lines. A fuel purge is required to eliminate the possibility of coking inside the injectors after the unit is turned off. There may be a slight over-temperature in the TET due to excess fuel entering the combustor during this time (software masks TET reading for 10 seconds to avoid over-temperature faults). This over-temperature is normal for a shutdown, and will vary depending on the shutdown power level. No purge is performed if the run state was not reached. The engine shutdown sequence is as follows: 1. The fuel pump is turned off. 2. The air-assist solenoid is turned off. 3. The fuel purge valve on the manifold opens. During shutdown, the air-assist solenoid and 3-way switch are activated if the generator power is above 3kW to minimize over-temperature during purge. This generator power set point varies with ambient conditions and shutdown conditions. Air-assist Function Air-assist pressure/flow is utilized during normal engine operation to atomize fuel for combustion and to purge the fuel lines during system shutdown. Air may be supplied to the injectors through the air-assist solenoid or through engine compressor discharge pressure (PCD) – see table below. PCD assists combustion fuel atomization during steady state operating conditions, excluding idle. Two other air-assist levels are achieved by using the pressure regulator and 3-way solenoid valve. Air-assist operation is summarized below (using iso-corrected power levels). Air Assist Operation Air Assist Level Function 3-Way Valve Position Air Assist Valve Customer Air Supply Used 10 psig + PCD Start-Up Fuel Shutdown Purge if Gen Pwr > 3kW1 PCD reference (energized) PCD reference (energized) ON OFF YES YES 10 psig + ambient Gen Pwr levels < "X" kW2 including Idle Fuel Shutdown Purge if Gen Pwr < 3kW1 Ambient reference (not-energized) Ambient reference (not-energized) ON OFF YES YES PCD Gen Pwr levels > "X" kW2 N/A OFF NO NOTES: 1Generator power level may vary with ambient conditions and shutdown conditions. 2If engine is going: up in speed - "X" = 10kW; down in speed "X" = 8kW. 410029-001 Rev A (April 2003) Page 4 of 11 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Liquid Fuel System Technical Information – Hybrid Electric Vehicle (HEV)
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