Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
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<strong>Standard</strong> <strong>Bus</strong> <strong>Procurement</strong> <strong>Guidelines</strong><br />
5.2.1.5 Operating Range<br />
The operating range of the coach run on the design operating profile shall be at least 350 miles on with a<br />
full capacity of fuel capacity.<br />
5.2.2 DRIVETRAIN<br />
5.2.2.1 Power Plant<br />
5.2.2.1.1 Engine<br />
The HHDD engine shall be designed to operate for not less than 300,000 miles without major failure or<br />
significant deterioration. Components of the fuel injector and/or control system shall be designed to<br />
operate for not less than 150,000 miles without replacement or major service. Mileage intervals are<br />
based on the design operating profile defined in Section 5.1.2.<br />
The engine shall meet all requirements of Part 5: Technical Specifications when operating on Nos. 1 or 2<br />
diesel fuel, as certified by the engine manufacturer and specified by the Procuring Agency. Durability of<br />
the engine and its <strong>com</strong>ponents shall not be seriously reduced and the requirement of Section 5.2.2.5.1<br />
shall be met by operation on either of the <strong>com</strong>mercially available diesel fuels.<br />
The engine shall be equipped with an electronically controlled management system, <strong>com</strong>patible with<br />
multiplex wiring systems and either 12- or 24-volt electrical systems. The engine control system shall<br />
be capable of receiving electronic inputs from the engine and other vehicle systems. Communication<br />
between these electronic systems shall be made using the SAE J1939 Re<strong>com</strong>mended Practice<br />
<strong>com</strong>munication link. The engine's electronic management system shall monitor operating conditions<br />
and provide instantaneous adjustments to optimize both engine and bus performance. The system shall<br />
have the capability of being programmed, allowing the Procuring Agency to optimize engine<br />
performance. Initial performance settings shall only be changed with authorization from the bus and<br />
engine manufacturers to keep engine warranties valid.<br />
The engine shall have on-board diagnostic capabilities, able to monitor vital functions, store out-ofparameter<br />
conditions in memory, and <strong>com</strong>municate faults and vital conditions to service personnel.<br />
Diagnostic reader device connector ports, suitably protected against dirt and moisture, shall be provided<br />
in operator’s area and inside engine <strong>com</strong>partment. The on-board diagnostic system shall inform the<br />
operator via visual and/or audible alarms when out-of-parameter conditions exist for vital engine<br />
functions. Conditions that require an operator alarm are identified in Section 5.4.6.1.6. The engine<br />
control system shall prevent high engine rpm operation before adequate lubrication is available to critical<br />
<strong>com</strong>ponents.<br />
The engine starter shall be protected by an interlock that prevents its engagement when the engine is<br />
running. Special equipment or procedures may be employed to start the engine when exposed to<br />
temperatures less than 30Ε F for a minimum of four hours without the engine in operation. All cold<br />
weather starting aids, engine heating devices and procedures shall be of the type re<strong>com</strong>mended by the<br />
engine manufacturer and approved by the Procuring Agency. The requirements for specific cold<br />
weather starting aids are included in attachments to Part V5: Technical Specifications.<br />
Technical Specifications 133 10/18/07
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