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The Use of a Chassis Dynamometer for Urban Transit Bys Preventive Maintenance Inspection
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Abstract
The use of a chassis dynamometer for inspection maintenance and drive train fault diagnosis has been developed for urban transit buses.
Transit bus maintenance management has long sought a means to optimize bus preventive maintenance intervals. Historically, transit bus preventive maintenance has been scheduled with either time or mileage as the controlling parameter. This paper provides a basis for implementing vehicle dynamic testing that can substantially reduce the costs and manpower associated with preventive maintenance inspections and repairs.
By subjecting the whole bus to the appropriate repeatable test conditions, certain measurements can be made to ascertain system parameters which can then be compared to established standards to indicate deteriorating conditions and diagnose defects. Dynamic inspection on a chassis dynamometer reduces to practice the maintenance principle, “if it works, don't fix it.”
This paper will present the test procedures and equipment specifications that have been used. The integration of the dynamic test program into the preventive maintenance plan is explained and baseline test data for urban transit buses has been developed.
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Authors
Citation
Pellegrin, V., Davis, L., and Porter, H., "The Use of a Chassis Dynamometer for Urban Transit Bys Preventive Maintenance Inspection," SAE Technical Paper 872269, 1987, https://doi.org/10.4271/872269.Also In
References
- Trost, Norman F. Production Line Road Test Simulation With Electric Dynamometer SAE Paper 445C January 1962
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- Dyno Times 2 2 Clayton Industries 1986
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- Horsepower Losses, Cummins Engine Company 1972
- Procedure for Calculating Wheel Horsepower, Detroit Diesel Allison 1983
- Lowi, Alvin Chassis Dynamometer Requirements for Cost Effective Maintenance Inspection in SCRTD Transit Operations February 1984
- Southern California Rapid Transit District, Equipment Maintenance Department “Dynamometer Tire Temperature Tests” January 1984
- Southern California Rapid Transit District, Equipment Maintenance Department Major Inspection Report November 1984
- Southern California Rapid Transit District, Equipment Maintenance Department Chassis Dynamometer Operator's Manual June 1986
- Southern California Rapid Transit District, Equipment Maintenance Department “Tune-up Intervals - The Division 3303 Experience” April 1985
- “Diesel Smoke Measurement Procedure” Society of Automotive Engineer's Handbook 1982
- Clayton Manufacturing Company “Passenger Car Performance Guide” 1983
- California Air Resources Board “Steaty State Chassis Dynamometer Emission Test Procedure for Heavy Duty Vehicles” November 1985