Japan: Heavy-duty: Emissions

Overview

 * Standard type: Conventional pollutant emission limits
 * Regulating body: Ministry of the Environment, MOE
 * Current standard: Post New Long Term Emission Standards (2009)
 * Future standard: 2016; standards are updated within existing legislation
 * Applicability: New type-approved trucks and buses with GVW > 3.5 t

History
Limit values for new truck and bus engines in Japan are set by the Ministry of the Environment under authority of Japan's Air Pollution Control Law. Over the past decade, exhaust emission standards have been strengthened three times, from 2003-2005 (the "New Short Term Standards"), in 2005 (the "New Long Term Standards"), and in 2009 (the "Post New Long Term Standards"). Testing is conducted over Japan-specific drive cycles.

Technical Standards
Two types of exhaust emission standards are established in Japan, denoted as “mean” and “max.” The “mean” standards are to be met as a type approval limit and as a production average. The “max” standards are to be met generally as an individual limit in series production and as type approval limit if sales are less than 2000 per vehicle model per year. The “max” standards are shown in parentheses in the following tables.

Implementation dates in the tables refer to new vehicle models. Current production models are often allowed a delay of up to one year.

Diesel Vehicles
Emission standards for new diesel-fueled commercial vehicles are summarized below for heavy-duty vehicles (engine dynamometer test).

Gasoline Vehicles
Emission standards for new gasoline-fueled commercial vehicles are summarized below for heavy-duty vehicles.

Testing
The test procedure for heavy-duty engines is the JE05 mode cycle (hot start version). Before 2005, heavy-duty engines were tested over the 13-mode cycle and the 6-mode cycle. Vehicles and engines were tested using 50 ppm S fuel for 2005 standards, and 10 ppm S for the 2009 standards.

Regulatory Documents
New Post Long-Term Standards

Historical Emission Standards

Regulatory Agencies
Ministry of the Environment (MOE)

Additional Resources
The Motor Industry of Japan report, JAMA, May 2013