Surveillance Study of Control Equipped Heavy-Duty Gasoline Powered Vehicles.

摘要

This interim report covers the results of the first year of exhaust emission tests on a group of 152heavy-duty gasoline fueled 1970and 1971model year vehicles. Each of the trucks were tested at four month intervals using a chassis version of the heavy-duty gasoline nine-mode Federal Test Procedure. An additional group of ten truck engines were tested on both a stationary engine dynamometer as prescribed by the FTP and on a chassis dynamometer to determine the correlation between the 2test methods. The first objective of the project,to determine the effectiveness of exhaust emission controls on new 1970and 1971trucks in actual operation,has been met. The results of the initial round of tests indicate that a majority of the trucks were within the 1970Federal standards for HC emissions and that less than half were within the standards for CO emissions.