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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) System Operation Engine Start-up The MicroTurbine initiates a fuel line fill cycle at the beginning of the start sequence. Fuel supplied by the customer is cycled into the fuel lines from the fuel pump (and optional boost pump). At the end of each injector’s line fill sequence, the system performs a check to detect a clogged injector. The Liquid Fuel Controller (LFC) supplies voltage and current to the fuel pump. As individual injector lines fill, the manifold pressure rise-over-time is monitored to determine if the fuel line is full to the injector. If the pressure rate requirements are not satisfied, the unit issues a “16004 LF FAIL LINFIL” pressure-related fault. Fuel is introduced into the combustion chamber through injector #1 after the MicroTurbine reaches ignition speed. When the Turbine Exit Temperature (TET) sensor reports an increase in temperature, the system is declared lit, and the MicroTurbine accelerates to full load. The engine start-up sequence is as follows: 1. The air-assist solenoid opens to provide air to the air-assist manifold. 2. The 3-way solenoid is set to reference PCD, resulting in an air-assist pressure of PCD + 10 psig 3. The fuel shutoff and injector #1 solenoid open to allow fuel flow through injector #1. If the customer supplied air-assist pressure is less than 40 psig at start-up, the air-assist solenoid is shut off and a “16009 LF STRTAIR SOL” fault will occur. The drain tank is used to collect excess fuel during an engine 6006 Fail to Light fault. The tank is equipped with a float sensor to provide feedback to the operator related to the level of fuel in the tank. There are two levels: 1) Lower level (30% full) which triggers a warning fault if actuated, and 2) High level (80% full) which triggers a shutdown fault if actuated. Idle Operation The system is considered in “idle” state if the power level is 0 kW. During idle operation, the unit operates on only one injector. If the engine experiences a combustion flame-out/stability issue, the controller will use auto-relight logic to select the most stable injector for idle operation. Steady State The system is considered to be in “steady” state if it is operating continuously at a power level greater than 0 kW. When the MicroTurbine reaches an ambient-corrected generator power of 7kW, the system will transition to three-injector engine operation. The injector switch point varies with ambient conditions. When off-loading, the engine will switch back from three injector to single injector operation. 410029-001 Rev A (April 2003) Page 3 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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