SAE J1667 and Diesel Particulate Matter
page last reviewed October 5, 2012
The Society of Automotive Engineers (SAE) J1667 Snap-Acceleration
Test Procedure applies to vehicle exhaust smoke measurements. The test is intended to be used on heavy-duty trucks
and buses powered by diesel engines.
The previous HDVIP snap-acceleration test procedure, SAE J1243,
was incorporated into the SAE J1667 test: signal averaging characteristics of the previously required smoke meters
and correction factors for varying ambient conditions and altitude were incorporated into SAE J1667. The test procedure
was approved by the SAE in 1996 and adopted into the ARB
s HDVIP regulations in 1997. The ARB subsequently resumed the HDVIP with the revised snap-acceleration test procedure
on June 1, 1998.
Diesel Particulate Matter
Diesel engines emit a complex mixture of air pollutants, composed
of gaseous and solid material. The visible emissions in diesel exhaust are known as or particulate matter or PM.
In 1998, California identified diesel exhaust particulate matter as a toxic air contaminant based on its potential
to cause cancer, premature death, and other health problems. Diesel engines also contribute to California's fine
particulate matter (PM 2.5) air quality problems. In addition, diesel soot causes visibility reduction and contributes
to global warming. According to California law, an airborne toxic control measure using the best available control
technology must be employed to reduce the public
s exposure to diesel particulate matter.
For more information, please see the ARB report: Summary of Adverse Impacts of Diesel Particulate Matter.