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This report summarizes the development work for the US06 Low Power Vehicle Adjustment (LPVA) algorithm for the Supplemental Federal Test Procedure (SFTP). The algorithm is integrated into the control software of a 48 inch (1219 mm) single roll electric dynamometer, and temporarily assists vehicles by reducing the road load. To qualify for assistance, vehicles must accumulate 7 seconds of wide-open-throttle (WOT) within any of five prescribed windows of time during the US06 test. WOT is defined as 85-100% of the vehicle's throttle position sensor (TPS) output. The assistance continues until the TPS signal falls below the 85% criterion. The assistance typically lasts 1 second before WOT is relieved and yields approximately 8 seconds of total WOT condition. The LPVA algorithm has been successfully tested on a number of vehicles with a range of data acquisition rates.

The DynoCal system for auditing chassis roll dynamometers has been developed for the California Bureau of Automotive Repair. It evaluates performance of new dynamometer designs and operational dynamometers in the field. The system includes a 50 kW electric motor with torque, thrust, and speed instrumentation. It functions as a vehicle to drive the chassis rolls under computer-controlled test modes. A trailer transports the system and houses the battery power supply, chargers, flux vector power converter, and computer. The controls are user-friendly, with graphic displays and high-speed data acquisition. Among other functions, this unique test instrument measures dynamometer road load and inertia simulation accuracy.