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Heavy-Duty In-Use Compliance Program
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In 2014 CARB started the Heavy-Duty In-use Compliance Program (HDIUC). This program was developed to ensure heavy-duty vehicles are compliant with the applicable emission standards. It consists of testing heavy-duty in-use vehicles using portable emission measurement systems (PEMS) and evaluating emissions by using the Not-To-Exceed (NTE) testing protocol. PEMS allows us to measure emissions on-road over typical traveled freight routes. Once it has been determined that an engine family is not in compliance then the manufacturers must take corrective action to fix the non-conformity. Corrective action is usually in the form of a recall in which vehicles are repaired and brought back into compliance. The repairs are done at no cost to the vehicle owner.
In order to conduct a successful program, CARB solicits the participation of fleets/owners. To determine compliance, test vehicles must be randomly selected and procured from multiple sources. Please watch the video below to further understand the procurement and testing process.
Why participate?
- Fleet participation is critical to evaluate emission performance of in-use vehicles
- Fleet participation could result in emissions reductions and cleaner air for California and the nation
- Monetary incentive
- Vehicle is returned with a full tank of fuel
- Vehicle is returned with a full tank of diesel exhaust fluid (DEF)
- Convenient pickup and drop-off arrangements
Vehicle Procurement Considerations
- Specific Engine Family is needed
- Vehicle must be within usefull life:
- Under 110,000 miles for light heavy-duty diesel engines
- Under 185,000 miles for medium heavy-duty diesel engines
- Under 435,000 miles for heavy heavy-duty diesel engines
- Vehicles must be safe to operate
- Vehicles must meets Department of Transportation requirements
- Engines must be properly maintained following the prescribed maintenance schedule for:
- Oil
- Air filter
- Fuel filter
- DPF
- No major engine work performed (e.g. engine rebuild)
- No significant fluid leaks
Testing
- All test vehicles undergo an extensive inspection and restorative maintenance (if applicable).
- Vehicles are scanned through the OBD port to access the condition of the vehicle and gather engine operating parameters such as RPM and torque.
- Vehicles are then equipped with PEMS by experienced engineers.
- Testing is non-intrusive and typically only the exhaust tip/pipe is removed and replaced by a flow meter and at the end of testing the vehicle is returned to its original configuration.
- The test route is about 300 miles and vehicles are driven under normal conditions on local highways including Interstate15 and Interstate10.
Regulatory Requirements
- Code of Federal Regulations, Title 40, Part 86.1370 and 1065
- California Code of Regulations Title 13, Sections § 2111 – 2140, 1956.8
- California Health and Safety Code
- California Exhaust Emissions Standards and Test Procedures for2004 and Subsequent Model Heavy-Duty Otto-Cycle Engines and Vehicles