The project investigated the reductions in exhaust emission levels attainable using various control techniques appropriate to gasoline and diesel engines used in vehicles over 14,000-lb GVW. A total of eight gasoline and one diesel engine were evaluated in the laboratory phase of the project. Control equipment included oxidation and reduction catalysts, exhaust gas recirculation and air injection systems, and a deceleration device. Evaluation of the gasoline 'best combination' configuration included: three engine emissions test procedures using an engine dynamometer, a determination of vehicle driveability, and one vehicle emission test procedure using a chassis dynamometer. The driveability evaluations, performed in appropriately sized trucks, included a cold start driveaway, warm driveability and acceleration performance using special procedures for large trucks. Hydrocarbons, carbon monoxide, nitrogen oxides, and aldehydes were monitored.


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