Research Projects

Project at a Glance

Project Status: complete

Report Published July 1993:

Title: Development of baseline and controlled exhaust emission rates for off-highway vehicle engines

Principal Investigator / Author(s): White, Jeff J

Contractor: Southwest Research Institute

Contract Number: A198-076

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


Southwest Research Institute performed this project for ARB to develop baseline and controlled exhaust emission rates for off-highway vehicle engines. Existing emission data for this category were reviewed and engines were recommended for which baseline emission testing was most needed. Test procedures were evaluated and specific test cycles and analytical methods were recommended. Ten off-highway vehicle category engines were tested to determine baseline emissions. Emission control technologies applicable to this category were evaluated. The more promising technologies were engine tested to demonstrate the potential emissions reductions achievable. Spark-ignited engine technologies evaluated included alternate fuels (LPG and CNG), exhaust gas recirculation (EGR), and three-way catalyst, in conjunction with closed-loop control. Diesel engine technologies evaluated included retarded injection timing and turbocharging. This information will be used by ARB to develop exhaust emission standards and regulations for the off-highway vehicle category.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

Stay involved, sign up with ARB's Research Email Listserver