66--Combustion Analysis System (CAS)

In accordance with FAR Part 12 Commercial Procedures, the U.S. Environmental Protection Agency requires a Combustion Analysis System (CAS) in accordance with the following specifications: A. Combustion Analysis The Combustion Analysis System is used to analyze engine combustion processes by measuring the engine cylinder pressure waveforms and crankshaft rotation signals. The Following are requirements for the Combustion Analysis System. 1. Computes in real-time Indicated Mean Effective Pressure (IMEP) for each cylinder every cycle. 2. Computes in real-time additional individual-cycle combustion parameters for each cylinder, such as: ? Low IMEP, Pumping Mean Effective Pressure (PMEP), and Net Mean Effective Pressure (NMEP). ? Misfires including IMEP Percent Misfire, and IMEP Total Misfire. ? Peak pressure, maximum rate of pressure rise and locations. ? Polytropic coefficients of expansion and compression. ? Upper, lower, and average pressure envelopes. ? Injector start and duration (both crank angle and time). ? Mass Fraction Burn and Mass Burn Rate. ? Engine averages of IMEP, NMEP, peak pressure, max. rate of pressure rise, and their location ? Knock intensity and peak. 3. Computes in real-time minimum, maximum, mean, standard deviation, COV, and LNV of combustion parameters using moving window analysis. 4. Individual statistical calculations can be enabled for every real-time calculation. 5. Displays in real-time calculated combustion parameters as they occur. 6. Outputs in real-time analog representations of selected combustion parameters for external oscilloscopes and strip charts. 7. Logs and correlates in real-time tip to 64 megasamples ( 128MBytes) of raw and/or calculated combustion parameters for post test analysis. 8. Displays on-line scope traces of raw signals, encoder or time-based, even logP-logV. Also displays scope traces of processed signals such as rise rate curves, burn curves, etc. 9. Supports up to: ? 12 cylinders ? Unequal firing intervals ? 2 or 4 stroke gas and diesel engines ? 0.1 Degree Shaft Encoder, any make (even pulses off flywheel gear teeth) 10. Supports multiple real-time processor for increased computational throughput. 11. Data decimation allows monitoring and/or recording of raw signals at different encoder resolutions in different parts of the engine cycle. 12. Monitoring of real-time combustion parameters is continuous and not disrupted by logging of data. 13. Context sensitive help. 14. An engineering unit conversion facility allows for display of data in any appropriate units. 15. Displays are setup and modified by the user from a toolbox of graphical display elements. 16. A data viewing utility provides plots of all collected data for immediate review. 17. Data can he converted to file formats compatible with Lotus, Asyst, PCMATLAB, IFEF and IB\1 Floating-Point, DIA, PJAS and ASCII. B. Knock Analysis The Combustion Analysis System shall have the ability to quantify knock on a cylinder-by-cylinder and cycle-by-cycle basis. Cylinder pressure signals shall be filtered to isolate the knock frequencies. Intensity and peak value analysis shall be performed for each engine cycle. Simultaneous acquisition of standard combustion data shall allow for cycle-by-cycle correlation. C. Hardware The system shall consists of a Windows PC (supplied by EPA) and VXIbus (4, 6, or 13 slot) crate (mainframe) (supplied by EPA) containing the following two C-size modules: 1. System Control Module The System Control Module shall handle data logging and perform all real-time calculations. It shall also handle communication via an Ethernet port which provides connections to the Graphical User Interface (GUI) resident on the user's PC, and via a VXI bus interface which handles backplane communication to other VXI bus systems. The System Control Module shall have the ability to add up to four real-time processors. The System Control Module shall have at a minimum, the following specifications: ? VXIbus C-size Module ? Continuous real-time processing ? Direct Ethernet interface to PC ? 64 channels of high-speed external analog input ? 16 TTL inputs ? 8 slow-speed AID inputs ? 8 D/A outputs ? 8 TTL inputs ? Up to 5 real-time floating point processors ? Up to 64 MSamples of raw data storage Block mode decimation of raw data 2. Analog Input Module The Analog Input Module shall accept high-speed, crank-angle based signals and converts them to digital values. The values shall be either stored and used simultaneously for real-time calculations or stored for future analysis. The Analog Input Module shall have at a minimum, the following specifications: ? VXIbus C-size Module ? 16 Analog to Digital (A/D) channels per module ? 12-bit, 1 MSample/channel conversion rate ? Programmable gains for each channel ? Self-calibration and diagnostics ? Compatible with EPA supplied charge amplifiers, see section 3. 3. Charge Amplifiers EPA shall provide the charge amplifiers and the pressure transducers. The specifications are as follows: ? Kistler Charge Amplifier Type 5010B 4. Interface Boards and Cables The Interface Boards and Cables shall have at a minimum, the following specifications: ? 19" Rack mount Interface Boards with cables to System Control and Analog Input modules ? All necessary cables and connectors shall be provided. ? Compatible with EPA supplied charge amplifiers, see section 3. D. System Software 1. Graphical User Interface (GUI) The GUI resides on a PC. An Ethernet connection provides communication with the system control module. The GUI shall have at a minimum, the following specifications: ? Compatible with Windows NT 4.0 service Pack 6 or Windows 2000 ? Flexible screen configuration ? Context sensitive help ? Gauges, bars, values, strip charts, O-Scopes ? Screen elements that indicate out of limit conditions 2. Overall Data Acquisition and Storage ? Real-Time calculations of results with statistics ? Envelopes ? Save pegged or unpegged raw data ? Save processed pressure curves (trace calculations) 3. Communication and Integration ? VXIbus C-size hardware for backplane communication ? Supports communication via VXI backplane to other instrumentation. ? Ethernet connection to PC ? Real-time results for display Interested parties should submit a written request to Scott Tharp by fax (513) 487-2107 or by e-mail [email protected] to receive the RFQ, Specifications, Technical Evaluation Criteria. Quotations are due 4/26/02. TELEPHONE REQUESTS WILL NOT BE HONORED.