Approaches for detecting high NOx emissions of aged petrol cars during the periodic technical inspection
report
Emission tests in earlier TNO studies show that a small group (6%) of petrol passenger cars, with a malfunctioning three-way catalytic converter, account for a large proportion (36%) of the total NOx emissions of passenger cars. NOx emissions in vehicles with a defective three-way catalytic converter can increase by a factor of 10 or more relative to well-functioning vehicles. The current tests in the Dutch periodic technical inspection (PTI) fail to effectively detect such defects in petrol vehicles. As a result, vehicles with a malfunctioning three-way catalytic converter remain in use, resulting in high NOx emissions. This problem will persist for the coming years because no adjustments are foreseen in the legislation that governs the PTI. In 2030, the total additional NOx emissions from defective petrol passenger cars are estimated at 3 kton, or about 22% of the total NOx emissions from passenger cars.
TNO Identifier
967066
Publisher
TNO
Collation
19 p.
Place of publication
Den Haag