EAST GRANBY, Conn., Nov. 17, 2015 /PRNewswire/ -- As vehicle manufacturers, regulators and governments around the world seek solutions to prevent another emissions cheating scandal similar to the Volkswagen case, one of the world's leading vehicle emissions inspection companies has compiled and analyzed on-road emissions data indicating that emissions violations of vehicles under real-world driving conditions may well go far beyond VW diesels. This company says a two-pronged approach that continuously monitors real-world emissions is the only effective remedy.
Lothar Geilen, CEO of Opus Inspection, says he is encouraged that officials in North America and Europe have acknowledged that greater independent testing of vehicles is necessary. In the U.S., the EPA says it will add on-road testing to its regimen; German Environment Minister Barbara Hendricks says regulations have to be demanding enough that diesel vehicles truly cause less pollution, with independent authorities' conducting controls to verify it; and U.K. Transport Secretary Patrick McLoughlin says the U.K. leads Europe in calling for real-world testing.
Such testing, Geilen says, should indeed focus on the road, where vehicles pollute and cannot easily cheat; however, he also indicates the true scope of the problem is not widely understood because few people have closely analyzed large databases of on-road emissions gathered by roadside sensors. His company employs roadside sensors gathering millions of measurements each year under contract to various state governments. The engineers and scientists working for Opus have applied sophisticated, big data analysis techniques to this information and found some very troubling results. Not only does their analysis flag VW diesel engine emissions, it also flags many other makes and models, including the U.S. manufacturers of gasoline-powered vehicles. The data even suggest that emissions violations vary considerably for certain models from one model year to the next – giving even more credence to the view that continuous on-road monitoring is needed.
Geilen cautioned, "The data is not, by itself, an indictment of these vehicles. Confirmatory testing is needed under more controlled conditions. Nonetheless, the old cliche 'where there's smoke' should be taken seriously in this case." Does this mean that most vehicle manufacturers are cheating? Geilen says no. "The public needs to understand there is a 'grayscale' of intent from outright cheating to innocent performance anomalies discoverable only through real-world performance measurement. Unfortunately, our laws and regulations have focused too heavily on the laboratory emissions testing required for a vehicle to gain government-type approval and not enough on real-world performance. We are incentivizing manufacturers to calibrate performance to the laboratory test. Unless a truly statistically significant sampling of real-world performance is made, manufacturers don't really know how their vehicles are performing once they're on the road. Our data suggest that sampling requires thousands of measurements on each model year – year in and year out throughout the model's life cycle."
Geilen goes on to say two complementary and distinctly different methods of testing vehicles on the road should be used: One attaches a Portable Emissions Measurement System (PEMS) to a vehicle, while the other incorporates roadside sensors commonly referred to as Remote Sensing Devices (RSD) or simply "Remote Sensing."
"The two methods of on-road testing, PEMS and Remote Sensing, are complementary, and both need to be stepped up," Geilen said. "Because the first method is limited by its coverage of individual vehicles (one at a time) and associated vehicle recruitment challenges, it could benefit from an additional, real-world, in-use surveillance program that measures thousands of vehicles per day as they drive by, thereby identifying specific vehicle makes/models exhibiting abnormal emissions behavior. These flagged makes/models would then be good candidates for extensive PEMS testing. The second method, Remote Sensing, is exactly the kind of surveillance program that can help the PEMS focus its detailed investigations."
With PEMS, a particular vehicle is heavily instrumented and then driven on-road while its emissions are recorded. West Virginia University researchers used this expensive method to measure three individual diesel vehicles, which led to the confirmation of the Volkswagen defeat device. The challenge, Geilen says, is that only a limited number of vehicles can be tested in this manner. While about 450 vehicle models may be certified each year based on testing by manufacturers, U.S. in-use compliance testing after initial certification requires further testing of three vehicles from each model, once at low mileage and once at higher mileage. Therefore, a total of only six vehicles per model may be tested over a model's entire lifetime. Even with a vastly stepped-up independent, on-road PEMS testing program, broad-scale testing of models will be limited. "Recruitment of random test subjects is a major challenge because vehicles have to be obtained with the consent of the owner, often a dealer," Geilen said. "Driving conditions are likely to be limited in terms of weather conditions, altitude and fuel formulations that vary across the nation. A much larger, statistically significant sampling is needed if we are to identify problem vehicle models before their pollution leads to premature deaths."
The second method of testing vehicles, Remote Sensing, works completely independent of the vehicles being measured. A "remote sensor" is placed on the side of the road and measures emissions of vehicles as they drive by. A single remote sensor acquires thousands of measurements per day from all models of vehicles on the road.
For example, Geilen says that a Remote Sensing program in the Denver metropolitan area captures 7 million measurements per year. In 2014, over 4,000 distinct models identified by fuel, type, weight class, make and engine, representing 93 percent of all vehicles active in the region, were measured at least 100 times. Just over 1,000 more popular models representing 65 percent of active vehicles were measured over 1,000 times. These data provide striking statistical evidence of how the emissions control systems of all vehicle models are performing in the real world from their first year of sale until their retirement.
"The offending VW diesel vehicles could have been identified in the first year of their sale instead of five years later, had the data analysis goals of our contract included monitoring of specific make/model performance as opposed to focusing on individual vehicle performance. Even lacking that data analysis focus, our scientists and customer associates using Remote Sensing discovered the VW emissions exceedance via Remote Sensing data and presented it at an industry conference in spring of this year, well before its public unveiling," Geilen said. "Extended to other metropolitan areas and including a mandate to search for possible noncompliant makes/models, Remote Sensing would provide valuable emissions data on vehicle models operating under many conditions."
By comparing the emissions of a model to those of similar models from other manufacturers and to emissions standards, Geilen says obvious patterns emerge. Because a relatively low number of Remote Sensing devices can efficiently measure millions of vehicles under actual driving conditions, Remote Sensing databases offer the advantage of identifying emissions behavior of vehicle model groups over time, something PEMS and the current in-use compliance regulations cannot achieve. By adding a large-scale, continuous Remote Sensing monitoring program, we could track emissions levels of specific model groups in statistically significant numbers over years of in-use service, thereby illuminating the effects of wear as well as the effects of emissions-related calibration changes made by manufacturers to vehicle software. Feedback from such information would lead to earlier repairs and improved vehicle designs. Geilen says expanding programs such as the effective Remote Sensing operation in Colorado is vital to ensuring low-emissions performance and avoidance of the premature deaths caused by motor vehicle air pollutants.
"The Denver Remote Sensing program is operated at a state level and has been in operation for a decade. However, its long-term continuance is not guaranteed, and it covers only a high-altitude region," Geilen said. "In addition to PEMS, a more methodical, larger-scale federally funded program of Remote Sensing measurement and data analysis should be put in place as an integral real-world surveillance element of in-use emissions compliance."
About Opus Inspection
Opus Inspection is a multinational company with over 1,000 employees dedicated exclusively to motor vehicle inspection.
Opus Inspection is a fully vertically integrated company with operations in 22 of the United States and several countries worldwide. Building on an unmatched record of success and customer satisfaction, Opus Inspection has become the industry leader in providing professionally managed solutions for centralized and decentralized vehicle inspection programs that apply leading-edge technology to data management, safety and emissions testing equipment, on-road Remote Sensing, and On-Board Diagnostic (OBD) monitoring.
SOURCE Opus Inspection