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Class-8 Heavy Truck Duty Cycle Project Final Report - Center for ...

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1.3.4 De-instrumentation:<br />

Following the completion of pilot testing in mid-January 2006, the test vehicle was de-instrumented<br />

at the Dana Tech. <strong>Center</strong> and all of the equipment owned or leased by ORNL was returned.<br />

1.4 TIRES USED IN THE PILOT TEST<br />

The Pilot Test ef<strong>for</strong>ts also involved the evaluation of the effect of tire type on vehicle fuel economy.<br />

Michelin provided the tires shown in Table 2 <strong>for</strong> the pilot testing ef<strong>for</strong>ts.<br />

Table 2. Tire Sizes and Types<br />

No. of Tires Tire Size<br />

2 XZA3 275/80R22.5<br />

8 XDA-HT 275/80R22.5<br />

8 XT1 275/80R22.5<br />

4 X-One XDA-HT PLUS 445/50R22.5<br />

4 X-One XTE 445/50R22.5<br />

For each of the Pilot Test routes (see Section 1.4.2 <strong>for</strong> greater detail), the vehicle was configured with<br />

standard dual tires (275/80R22.5) <strong>for</strong> the first run. On the second run, the vehicle was configured<br />

with NGSWBTs (Michelin X-One; 445/50R22.5). The routes with their associated tires are listed in<br />

Table 3.<br />

Table 3. Tires per Route<br />

Steer Drive Trailer<br />

Chicago-Portland #1 XZA3 XDA-HT XT1<br />

Chicago-Portland #2 XZA3 X-One XDA-HT Plus X-One XTE<br />

Maine-Miami #1 XZA3 XDA-HT XT1<br />

Maine-Miami #2 XZA3 X-One XDA-HT Plus X-One XTE<br />

Specific tire pressures were monitored and maintained throughout the Pilot Test to limit uncontrolled<br />

variables which would introduce uncertainty into the Pilot Test data collected.<br />

1.5 DESCRIPTION OF THE PILOT TEST<br />

1.5.1 Tractor, Trailer, and Payload<br />

The trailer was loaded with concrete ballast and sandbags to achieve a GVWR as close to 80,000 lbs<br />

as possible without exceeding the Gross Axle Weight Rating (GAWR) <strong>for</strong> any axle. The ballast was<br />

secured with load frames and binders to prevent movement and to provide load control during testing.<br />

A steer axle weight limit of 12,000 lbs is standard on conventional 6x4 tractors, while the drive and<br />

trailer axles were loaded to the limit of 17,000 lbs per axle.<br />

1.5.2 Description of the Routes Traveled<br />

The Pilot Test consisted of operating the test vehicle over predetermined routes on Interstate and state<br />

highways. The routes and schedule are outlined in Table 4.<br />

16

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