Despite the progress in reducing the emission rates of new vehicles, emission system component failure, lack of proper maintenance, tampering, and the normal deterioration of emission control system performance all act to offset these emission benefits.
Emission control system, in automobiles, means employed to limit the discharge of noxious gases from the internal-combustion engine and other components.
All transmission control units are interconnected with vehicle emission control systems that adjust engine timing and air-to-fuel ratios to reduce exhaust emissions.
Specific means of pollution control might include refuse disposal systems such as sanitary landfills, emission control systems for automobiles, sedimentation tanks in sewerage systems, the electrostatic precipitation of impurities from industrial gas, or the practice of recycling.
They want cars that run on electricity or hydrogen -- or simply cars that go further on a gallon of gasoline and have better emission control systems.
The agency's Monday filing said: "Nearly 600,000 diesel engine vehicles had illegal defeat devices installed that impair their emission control systems and cause emissions to exceed EPA's standards, resulting in harmful air pollution".
FCA US diesel engines are equipped with state-of-the-art emission control systems hardware, including selective catalytic reduction (SCR).
