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David R Cocker
Researcher at University of California, Riverside
Publications - 9
Citations - 184
David R Cocker is an academic researcher from University of California, Riverside. The author has contributed to research in topics: Diesel particulate filter & Portable emissions measurement system. The author has an hindex of 6, co-authored 9 publications receiving 144 citations. Previous affiliations of David R Cocker include Bourns College of Engineering & Community emergency response team.
Papers
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Journal ArticleDOI
On-road comparison of a portable emission measurement system with a mobile reference laboratory for a heavy-duty diesel vehicle
Kent C. Johnson,Thomas D. Durbin,David R Cocker,Wayne Miller,Dipak Bishnu,Hector Maldonado,Nate Moynahan,C. Ensfield,Christopher A. Laroo +8 more
TL;DR: In this paper, on-road comparisons between a mobile emissions laboratory (MEL) meeting federal standards and a portable emissions measurement system (PEMS) were made over different conditions; including road grade, vibration, altitude, electric fields, and humidity with the PEMS mounted inside and outside of the tractor's cab.
Journal ArticleDOI
Characterization of PM-PEMS for in-use measurements conducted during validation testing for the PM-PEMS measurement allowance program
M. Yusuf Khan,Kent C. Johnson,Thomas D. Durbin,Heejung Jung,David R Cocker,Dipak Bishnu,Robert Giannelli +6 more
TL;DR: In this article, the authors evaluated the performance of four Particulate Matter-Portable Emissions Measurement Systems (PM-PEMS) under different environmental and in-use conditions.
Journal ArticleDOI
Differences between emissions measured in urban driving and certification testing of heavy-duty diesel engines
Poornima Dixit,Poornima Dixit,J. Wayne Miller,J. Wayne Miller,David R Cocker,David R Cocker,Adewale Oshinuga,Yu Jiang,Yu Jiang,Thomas D. Durbin,Thomas D. Durbin,Kent C. Johnson,Kent C. Johnson +12 more
TL;DR: In this paper, emissions from eight heavy-duty diesel trucks (HDDTs) equipped with three different exhaust aftertreatment systems (ATS) for controlling NO x emissions were quantified on a chassis dynamometer using driving schedules representative of stop-and-go and free-flow driving in metropolitan areas.
Journal ArticleDOI
Characterization of the emissions impacts of hybrid excavators with a portable emissions measurement system (PEMS)-based methodology.
Tanfeng Cao,Robert L. Russell,Thomas D. Durbin,David R Cocker,Andrew Burnette,Joseph Calavita,Hector Maldonado,Kent C. Johnson +7 more
TL;DR: The results indicated the HB215 hybrid excavator provided a significant reduction in tailpipe carbon dioxide (CO2) emissions, but increased diesel particulate matter (PM) when compared to a similar model conventional excavator over the same duty cycle.
Validation Testing for the PM-PEMS Measurement Allowance Program
TL;DR: Miller et al. as mentioned in this paper presented the results of the in-use validation portion of the PM measurement allowance program under the NTE regulations, including a comparison between the PM PEMS and UCR's Mobile Emissions Laboratory (MEL) reference laboratory.