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Single-Unit Truck and Bus ABS Braking-In-A-Curve
Performance Testing
| 题名： | Single-Unit Truck and Bus ABS Braking-In-A-Curve Performance Testing |
| 作者： | Richard L. Hoover, J. Gavin Howe, and Mark A. Flick |
| 关键词： | Heavy Truck ABS Braking-in-a-Curve FMVSS Nos. 105 and 121 |
| 摘要： | This report documents the results of testing two buses and five straight trucks in braking-in-a-curve ABS performance tests. Federal Motor Vehicle Safety Standards (FMVSS) Nos. 105 and 121 do not currently require straight trucks and buses to meet braking-in-a-curve performance standards. Tractors are subject to these tests in FMVSS No. 121. The braking-in-a-curve tests were conducted by finding the maximum drive-through speed, making four stops at 75 percent of the drive-through speed, as is specified for truck tractors, and then determining the maximum brake-through speed. Maximum drive-through speed is defined as the fastest constant speed that a vehicle can be driven through at least 200 feet of curve arc length without departing the lane on a 500-foot radius curve with a 0.5 peak friction coefficient surface, with the driver making steering corrections as necessary Maximum brake-through speed is defined as the fastest speed at which a full brake application can be made while the vehicle is in the curve without the vehicle departing the lane, with the driver making steering corrections as necessary. Determination of the maximum brake through speed provided data on the potential margin of compliance or non-compliance for the test vehicles. Six out of the seven vehicles tested would comply with the performance requirements currently in effect for tractors of staying in the lane at 75 percent of the maximum drive-through speed (minimum required brake-through speed). These six vehicles remained in the lane during all four stops at the minimum brake-through speed and all had a significant margin of compliance. The seventh vehicle met the minimum requirement for the loaded condition, but did not pass the empty condition. It should be noted that while this vehicle had air brakes, it also had a gross axle weight rating greater than 29,000 pounds. Therefore, FMVSS No. 121 does not apply to this vehicle. The results of testing show that the braking-in-a-curve test is practicable, repeatable, and safe to perform for single unit vehicles. |
| 报告类型： | 科技报告 |
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