Part 11 NOx binning changes to modify in draft

[vmuthu2]

6.11.13.2 Fail criteria1 for MY2022+ Diesel Engines

REMOVE d. Fail if lifetime engine hours bin 1 (total) SPN 12593 < part 2 value + 600 seconds. NOx sensors will not be online. We will definitely FAIL this criteria during L1 testing on production trucks.

6.11.13.4 Fail/warn criteria2 for MY2022+ Diesel Engines

REMOVE e. Fail if active 100 hrs engine hours NOx Tracking Engine Activity Lifetime Engine Hours bin 1 SP 12389 12659< 600 seconds (where supported) NOx sensors will not be online during -84 test. We will definitely FAIL this criteria during L1 testing on production trucks. g. Warn for all active 100 hr bin 3 through bin 16 values that are greater than their respective values for bins 3 through 16 in part 2. (Where supported) h. Warn for all active 100 hr vehicle distance bins => 0.25 km. (Where supported). REMOVE i. Warn for active 100 hr EOE bin 1 SPN 12355 <= 0.5 or bin 2 SPN 12356 <= 0.5 kW-hr (Where supported). NOx sensors will not be online during -84 test and will report 0. REMOVE j. Warn for active 100hr engine out NOx bin 1 SPN 12338 = 0 or bin 2 SPN 12339 = 0. (Where supported). NOx sensors will not be online during -84 test and will report 0. REMOVE k. Warn for active 100hr system out NOx bin 1 SPN 12321 = 0 or bin 2 SPN 12322 = 0. (Where supported). NOx sensors will not be online during -84 test and will report 0.

[vmuthu2]

FALSE fails due to specification

WARN: 6.11.13.4.i - Active 100 hr EOE bin1 and bin2 received is <= 0.5kW-hr from Engine #1 (0) for SPN 12457, NOx Tracking Stored 100 Hour Engine Output Energy Bin 1 (Total): 0.000 kWh WARN: 6.11.13.4.i - Active 100 hr EOE bin1 and bin2 received is <= 0.5kW-hr from Engine #1 (0) for SPN 12458, NOx Tracking Stored 100 Hour Engine Output Energy Bin 2 : 0.000 kWh WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12338, NOx Tracking Active 100 Hour Engine Out NOx Mass Bin 1 (Total): 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12339, NOx Tracking Active 100 Hour Engine Out NOx Mass Bin 2 : 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12321, NOx Tracking Active 100 Hour System Out NOx Mass Bin 1 (Total): 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12322, NOx Tracking Active 100 Hour System Out NOx Mass Bin 2 : 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12440, NOx Tracking Stored 100 Hour Engine Out NOx Mass Bin 1 (Total): 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12441, NOx Tracking Stored 100 Hour Engine Out NOx Mass Bin 2 : 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12423, NOx Tracking Stored 100 Hour System Out NOx Mass Bin 1 (Total): 0.000 g WARN: 6.11.13.4.k - Active 100 hr system out Nox bin1 and bin2 received is = 0 seconds from Engine #1 (0) for SPN 12424, NOx Tracking Stored 100 Hour System Out NOx Mass Bin 2 : 0.000 g

[ericthomasswenson]

Looks more like the active 100 hr limits were incorrectly applied to the stored limits.

I tried to minimize stored 100 hr checks as they are will remain zero for a newly manufactured vehicle and may be populated for a field/development vehicle.

[ericthomasswenson]

Yes I assumed operating NOx sensors … no time from No NOx data is a conceptual error from a year ago.

[ericthomasswenson]

CARB wants urea injection as soon as the engine starts in the desire that 0 g / BHP is achieved. They have bristled at the notion that NOx sensors do not operate 24/7/365.

But you have a clear argument to make this a warning.

[vmuthu2]

Changing it to a WARN is not going to help. The NOx sensors will not be online. The IUMPR tool is a great place to do this check.

[ericthomasswenson]

See #1161

[ericthomasswenson]

Completed artifact conveyed to developers and users. Update pending from #1171

[ericthomasswenson]

See #1171 for implementation status.