1、 Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact i
2、nformation can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 5963 INCH-POUND MIL-DTL-62421A(AT) 17 SEPTEMBER 2009 SUPERSEDING MIL-DTL-62421(AT) 16 AUGUST 2002 DETAIL SPECIFICATION CONTROL, UNIT, ELE
3、CTRONIC, DIGITAL This specification is approved for use by the U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC), Research, Development and Engineering Command (RDECOM), Department of the Army, and is available for use by all Departments and Agencies of the Department o
4、f Defense. 1. SCOPE 1.1 Scope.This specification covers the system and acceptance requirements for a Digital Electronic Control Unit (DECU), herein referred to as the “assembly”. The assembly provides fuel handling and vehicle interface capabilities for the AGT 1500 gas turbine engine. The AGT 1500
5、is used in the M1, M1A1, M1A2 and Heavy Assault Bridge (HAB) applications. 1.2 Classification. This specification applies to the following classification types of assemblies (see 1.3). Type I - 12324815 includes space for a MIL-STD-1553 data bus, an integral backup battery and a diagnostic window (M
6、62421-1). Type Ia - 12324815-1 includes space for a MIL-STD-1553 data bus, a removeable backup battery, and a diagnostic window (M62421-2). Type II - 12324820 includes a MIL-STD-1553 data bus, a removeable backup battery, and does not include a diagnostic window (M62421-3). Provided by IHSNot for Re
7、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 2 1.3 Part or Identifying Number (PIN). The PINs to be used for the assemblies acquired to this specification are created as shown below: M 62421 1 Classification (see 1.2) 1 = Type I 2 = Type Ia 3 = Type II
8、Specification number Military specification 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional inform
9、ation or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1
10、 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). FEDERAL STANDARDS FED-ST
11、D-595/17875 - Insignia White, ANA 511 COMMERCIAL ITEM DESCRIPTIONS A-A-52557 - Fuel Oil, Diesel, for Posts, Camps and Stations A-A-59133 - Cleaning Compound, High Pressure (Steam) Cleaner DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-5624 - Turbine Fuel, Aviation, Grades JP-4, JP-5, and JF-5/JP-8 ST
12、MIL-PRF-6083 - Hydraulic Fluid, Petroleum Base, for Preservation and Operation Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 3 MIL-DTL-15024 - Plates, Tags, and Bands for Identification of Equipment, General Specification for MIL
13、-DTL-16884 - Fuel, Naval Distillate MIL-PRF-19500 - Semiconductor Devices, General Specification for MIL-C-22520/36 - Compression Tool, Hand, Type 2 For Semirigid Coaxial Cable (Category F Connectors) MIL-PRF-38535 - Integrated Circuits (Microcircuits) Manufacturing, General Specification for MIL-PR
14、F-46170 - Hydraulic Fluid, Rust Inhibited, Fire-Resistant, Synthetic Hydrocarbon Base MIL-DTL-83133 - Turbine Fuels, Aviation, Kerosene Types, NATO F-34 (JP-8), NATO F-35, and JP-8 +100. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-171 - Fini
15、shing of Metal and Wood Surfaces MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts MIL-STD-252 - Wired Equipment Classification of Visual and Mechanical Defects MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipme
16、nt MIL-STD-464 - Electromagnetic Environmental Effects Requirements for Systems MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests MIL-STD-883 - Microcircuits MIL-STD-1553 - Digital Time Division Command/Response Multiplex Data Bus DEPARTMENT OF DEFENSE HANDBOOKS MIL-HDBK-21
17、7 - Reliability Prediction of Electronic Equipment MIL-HDBK-454 - General Guidelines for Electronic Equipment (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 1
18、9111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or
19、 contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 4 DATA ITEM DESCRIPTIONS DI-IPSC-81433 - Software Requirements Specification (SRS) DI-IPSC-81435 - Software Design Description (SDD) DI-IPSC-81439 - Software Test Descripti
20、on (STD) DI-IPSC-81441 - Software Product Specification (SPS) DI-IPSC-81442 - Software Version Description (SVD) (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, P
21、A 19111-5094.) NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST) NIST-ITS 90 - Thermocouple Database (Information from the database can be accessed at http:/srdata.nist.gov/its90/main/ or can be obtained from srdatanist.gov or National Institute of Standards and Technology, Building 820, Room 11
22、3, 100 Bureau Drive, Stop 2310, Gaithersburg, MD 20899-2310.) TACOM DRAWINGS 12324815 - Digital Electronic Control Unit (type I) 12324815-1 - Digital Electronic Control Unit (type Ia) 12324820 - Digital Electronic Control Unit (type II) 12344343 - Interior CARC paint specification (Copies of these d
23、rawings are available from DAMI_STANDARDIZATIONconus.army.mil or U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000.) 2.3 Non-Government publications. The following documents form a part of thi
24、s document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. (see 6.2). AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) ASME-Y14.100 - Engineering Drawings Practices (Copies of these documents are available onli
25、ne at http:/www.asme.orgor from American Society of Mechanical Engineers, ASME Information Central Orders/Inquiries, PO Box 2300, Fairfield, NJ 07007-2300.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 5 ASTM INTERNATIONAL ASTM
26、D975 - Oils, Diesel Fuel (DoD adopted) ASTM D1655 - Aviation Turbine Fuels (DoD adopted) ASTM D4814 - Fuel, Automotive, Spark-Ignition Engine (DoD adopted) ASTM D5363 - Sealing, Locking, and Retaining Compounds: (Single Component) (Copies of these documents are available from www.astm.org or ASTM In
27、ternational, P.O. Box C700, West Conshohocken, PA 19428-2959.) GENERAL DYNAMICS LAND SYSTEMS (GDLS) LS199500011841 - Nuclear Hardening Criteria (Copies of this document are available from DAMI_STANDARDIZATIONconus.army.mil or U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Ce
28、nter, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000.) HONEYWELL ENGINES AND SYSTEMS 21-9187 - Data Packet Specification for DECU (Copies of this document are available from Honeywell Defense hereafter, referred to as “day power” (see figures 19 and 20). Five valid cal
29、culations shall be conducted in order to complete the routine. A calculation shall be considered valid if PM II (see 3.3.5.3) or PM III (see 3.3.5.4) is not present. The final calculation, the corresponding mission capability power (MCP) number and the current date shall be stored in EEPROM if no PM
30、 II or PM III is present. The MCP Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 25 number shall represent the day power referenced to an 87 F (31 C) day rounded in 5% increments as follows (see 4.3.3.6.3): MCP 87F day power MCP 1
31、 87F day power 95% 20. (2) Tactical idle is disabled. 3.3.6.3.1 Engine health check (types I and Ia). While the calculation is taking place, the fault lamp shall be illuminated. If the calculation is taking place while a PM IV is present (see 3.3.5.5) the fault lamp shall be de-energized until the c
32、alculation is complete. The results of the health check shall be displayed in the diagnostic window (see 3.3.1.4) during BIT (see 3.5.5.2) in the following order: percent day power, date, and MCP number (see 4.3.3.6.3.1). 3.3.6.3.2 Engine health check (type II). While the calculation is taking place
33、, a message shall be transmitted from the assembly on the 1553 data bus (see Honeywell Engines document 21-9187). The results of the health check shall be transmitted over the 1553 data bus after completion of the routing and when BIT (see 3.5.5.2) has been activated. The health check shall not acti
34、vate nor shall stop processing if a PM V is present (see 4.3.3.6.3.2). 3.3.6.4 Cooldown logic. 3.3.6.4.1 Cooldown logic types I and Ia (M1 and M1A1 vehicles). Upon pressing the purge button (see 3.3.1.7.6.1.1) after a successful start, a cooldown routine shall be initiated when tactical idle is fals
35、e (see 3.3.1.7.6.1.5) and pivot neutral is true (see 3.3.1.7.6.1.6). At that time, the assembly shall command the PTS to the full open position, set the PLA to 4, and cause the fault reset lamp to flash on and off at 0.5-second intervals (see figure 21). At the end of 2 minutes, the lamp shall stop
36、flashing and the assembly shall return to normal operational mode. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62421A(AT) 26 If, during this routine, any of the following conditions are met, the routine shall be disabled (see 4.3.3.6.4.1)
37、: a. The fault reset button is pressed (see 3.3.1.7.6.1.4) b. Tactical idle is switched to true (see 3.3.1.7.6.1.5) c. Pivot neutral is switched to false (see 3.3.1.7.6.1.6) 3.3.6.4.2 Cooldown logic (type II). 3.3.6.4.2.1 Cooldown logic type II (M1A2 Abrams vehicle). Upon receiving the stop command
38、via the 1553 data bus (see Honeywell Engines document 21-9187) after a successful start, a cooldown routine shall be initiated when tactical idle is false (see 3.3.1.7.6.1.5) and pivot neutral is true (see 3.3.1.7.6.1.6). At that time, the assembly shall command the PTS to the full open position, se
39、t the PLA to 4, and broadcast a message on the 1553 data bus (see figure 22). At the end of 2 minutes, the engine shall automatically shut down. If, during the routine, any of the following conditions are met, this routine shall be disabled (see 4.3.3.6.4.2.1): a. The fault reset is initiated (see 3
40、.3.1.7.6.1.4). b. Tactical idle is commanded (see 3.3.1.7.6.1.5). c. Pivot neutral is switched to false (see 3.3.1.7.6.1.6). d. PM V is true (see 3.3.5.6). e. NBC is commanded “on” (see 3.3.1.7.6.1.7). 3.3.6.4.2.2 Cooldown logic type II (HAB). The assembly shall function as specified in 3.3.6.4.1, e
41、xcept the purge discrete input shall be used to activate the routine (see 4.3.3.6.4.2.2). 3.3.6.5 External stop and LOP command. When the external stop and LOP command is received, the assembly shall respond according to the following (see 4.3.3.6.5 and figure 23): a. If NH 50%, the assembly conduct
42、s a shutdown (see 3.3.1.7.6.1.3). b. If NH is between 50% and 60%, the assembly shall interpret this as the LOP command and shall increase the NH idle speed one percent per second until the command goes away or 60% NH is reached. c. If NH 60%, the assembly conducts a shutdown (see 3.3.1.7.6.1.3). 3.
43、3.6.5.1 External stop and LOP command (types I and Ia). The EEPROM message specified in 3.3.6.5 shall support tables III and XI (see 4.3.3.6.5.1). 3.3.6.5.2 External stop and LOP command (type II). The EEPROM message specified in 3.3.6.5 shall support Honeywell Engines document 21-9187 (see 4.3.3.6.
44、5.2). 3.3.6.6 Manual NH trim. 3.3.6.6.1 Manual NH trim (types I and Ia). The manual NH trim algorithm shall be activated when the assembly receives a fault reset signal (see 3.3.1.7.6.1.4) followed by the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
45、-,-MIL-DTL-62421A(AT) 27 tactical idle signal (see 3.3.1.7.6.1.5), while power is supplied to the assembly, and while NH is less than 10%. Pulsing the fault reset button shall cause the assembly to increment the NH maximum speed limit curve from the minimum curve to the maximum curve in increments o
46、f 0.2% (4.33 Hz). By removing the tactical idle signal, the number displayed (in Hz) shall be stored as the manually programmed value. At the time of manual trim activation, the control shall capture the PTS feedback value for PTS adaptive logic (see 3.3.6.2) and reset the fuel flow trimming valve (
47、see 3.3.6.8.1) to zero (see 4.3.3.6.6.1). 3.3.6.6.2 Manual NH trim (type II). The activation procedure from 3.3.6.6.1 shall be in place to support 3.3.6.2 and 3.3.6.8.1. The maximum NH shall be programmable via the 1553 data bus (see Honeywell Engines document 21-9187 and 4.3.3.6.6.2). 3.3.6.7 Rollb
48、ack protection. If NH drops below 45%, after a successful start, T7 is within 10 F (5.6 C) of the limit (see 3.3.2.5), and the PTS is less than 6, a shutdown shall be commanded (see 3.3.1.7.6.1.3) assuming a stop has not already been commanded. The assembly shall store this fault in EEPROM (see 4.3.
49、3.6.7). a. Types I and Ia EEPROM data shall support tables III and XI b. Type II EEPROM data shall support Honeywell Engines document 21-9187 3.3.6.8 Flameout detection and auto relight. When the assembly detects a NH of less than 50% after a successful start, unless a stop command has been issued, the ignition exciter shall be energized until NH is greater than 51%, or
