EBUS, INC. Download PDF Report
E-Bus Inc. submitted a model 22 T, battery-electric powered, 23 seat/22-foot bus, for a 7 year/100,000 mile Battery-Electric STURAA test. The odometer reading at the time of delivery was 3,872.0 miles. Testing started on December 4, 2000 and was completed on May 4, 2001. The Check-In section of the report provides a description of the bus and specifies its major components.
The primary part of the test program is the Structural Durability Test, which also provides the information for the Maintainability and Reliability results. The Structural Durability Test started on January 29, 2001 and was completed on May 1, 2001.
The interior of the bus is configured with seating for 23 passengers including the driver. Free floor space will accommodate 5 standing passengers resulting in a potential load of 28 persons. At 150 lbs per person, this load results in a total gross vehicle weight of 20,050 lbs. In order to avoid exceeding the GAWR (8,000 lbs) of the front axle, ballast was removed for all five standing passengers and three front seated passengers. This reduction in passenger weight resulted in an adjusted GVW of 18,850 lbs. The seated load weight segment was performed at the same load (18,850 lbs). The final segment of the test was performed at a curb weight of 15,800 lbs. Durability driving resulted in no failures.
The components covered in Section 1.3 (Repair and/or Replacement of Selected Subsystems) were found to be readily accessible and no restrictions were noted.
The Reliability Section compiles failures that occurred during structural durability testing. Breakdowns are classified according to subsystems. The data in this section are arranged so that those subsystems with more frequent problems are apparent. The problems are also listed by class as defined in Section 2. The test bus encountered no failures during the course of testing.
The Safety Test, (a double-lane change maneuver) was to be performed in both right-hand and left-hand directions up to a maximum test speed of 45 mph. The test bus is designed to acquire a top speed of 40 mph, sufficient distance was not available to achieve the top test speed of 45 mph. A speed of 30 mph was safely obtained with no handling problems encountered. The performance of the bus is illustrated by a speed vs. time plot. Acceleration and gradeability test data are provided in Section 4, Performance. The average time to obtain 30 mph was 25.75 seconds.
The Shakedown Test produced a maximum final loaded deflection of 0.033 inches under a distributed static load of 10,500 lbs. The Distortion Test was completed with no water leakage observed during the test. All subsystems operated properly.
The Dynamic Towing Test was performed by means of a front flat tow. No damage or deformation was noted and no problem with the towing interface was encountered. Rear towing is not recommended by the manufacturer. The Static Towing Test was terminated after deformation of the towing interface was observed after completing the front 20° upward pull. The manufacturer does not recommend towing from the rear; therefore, a rear test was not performed. The Jacking and Hoisting Tests were also performed without incident. The bus was found to be stable on the jack stands and the minimum jacking clearance observed with a tire deflated was 6.5 inches.
An Energy Economy/Range test was run on simulated central business district, arterial, and commuter courses. With the batteries at a full state-of-charge, the bus achieved a maximum range of 53.4 miles over the course. The electrical power required to bring the batteries back to a full state-of-charge was 85 kilowatt hours with a charging time of 7.35 hours.
A series of Interior and Exterior Noise Tests was performed. This data is listed in Section 7.1 and 7.2 respectively.