Standard Bus Procurement Guidelines - APTAStandards.com

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Standard Bus Procurement Guidelines The bus shall be capable of a top speed of (Procuring Agency to insert number, understanding that top speed requirements may affect other performance characteristics) mph (for emergency and passing maneuvers) on a straight, level road at GVWR with all accessories operating. 5.2.1.3 Gradability Gradability requirements shall be met on grades with a dry commercial asphalt or concrete pavement at GVWR with all accessories operating. The power plant shall enable the bus to maintain a speed of 44 speed of 40 mph on a 2-1/2 percent grade and 7 mph on a 16 percent grade. (APTA Comment: Speed on 2 ½ percent grade revised due to change from SLW to GVWR) 5.2.1.4 Acceleration An average acceleration rate of {obtain mfr data} shall be achieved at GVWR between 0 and 15 mph. APTA comment: Recommend that acceleration compliance should be “time to speed” rather than average acceleration rate. Table below revised based on data received from transit systems, bus mfgs. and engine mfgs. The acceleration shall meet the requirements below and shall be sufficiently gradual and smooth to prevent throwing standing passengers off-balance. Acceleration measurement shall commence when the accelerator is depressed. In addition, the times to reach the respective speeds in the following table from a stall start shall not exceed the times listed in the table. MAXIMUM ACCELERATION TIMES (STALL START) (IDLE START) (Vehicle weight = GVWR, 50-State Power Plant) SPEED (MPH) 5 1.00 2.0 10 2.25 4.0 15 4.50 7.0 20 6.91 10.8 30 14.10 20.0 40 25.25 31.0 50 41.65 60 69.00 TIME (SEC) Technical Specifications 132 10/18/07
Standard Bus Procurement Guidelines 5.2.1.5 Operating Range The operating range of the coach run on the design operating profile shall be at least 350 miles on with a full capacity of fuel capacity. 5.2.2 DRIVETRAIN 5.2.2.1 Power Plant 5.2.2.1.1 Engine The HHDD engine shall be designed to operate for not less than 300,000 miles without major failure or significant deterioration. Components of the fuel injector and/or control system shall be designed to operate for not less than 150,000 miles without replacement or major service. Mileage intervals are based on the design operating profile defined in Section 5.1.2. The engine shall meet all requirements of Part 5: Technical Specifications when operating on Nos. 1 or 2 diesel fuel, as certified by the engine manufacturer and specified by the Procuring Agency. Durability of the engine and its components shall not be seriously reduced and the requirement of Section 5.2.2.5.1 shall be met by operation on either of the commercially available diesel fuels. The engine shall be equipped with an electronically controlled management system, compatible with multiplex wiring systems and either 12- or 24-volt electrical systems. The engine control system shall be capable of receiving electronic inputs from the engine and other vehicle systems. Communication between these electronic systems shall be made using the SAE J1939 Recommended Practice communication link. The engine's electronic management system shall monitor operating conditions and provide instantaneous adjustments to optimize both engine and bus performance. The system shall have the capability of being programmed, allowing the Procuring Agency to optimize engine performance. Initial performance settings shall only be changed with authorization from the bus and engine manufacturers to keep engine warranties valid. The engine shall have on-board diagnostic capabilities, able to monitor vital functions, store out-ofparameter conditions in memory, and communicate faults and vital conditions to service personnel. Diagnostic reader device connector ports, suitably protected against dirt and moisture, shall be provided in operator’s area and inside engine compartment. The on-board diagnostic system shall inform the operator via visual and/or audible alarms when out-of-parameter conditions exist for vital engine functions. Conditions that require an operator alarm are identified in Section 5.4.6.1.6. The engine control system shall prevent high engine rpm operation before adequate lubrication is available to critical components. The engine starter shall be protected by an interlock that prevents its engagement when the engine is running. Special equipment or procedures may be employed to start the engine when exposed to temperatures less than 30Ε F for a minimum of four hours without the engine in operation. All cold weather starting aids, engine heating devices and procedures shall be of the type recommended by the engine manufacturer and approved by the Procuring Agency. The requirements for specific cold weather starting aids are included in attachments to Part V5: Technical Specifications. Technical Specifications 133 10/18/07
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American Public Transit Association
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