A Study of Heated Versus Unheated Oxygen Sensor Applied on a Motorcycle EFI System

摘要

In the future more stringent emission regulations will enforce closed-loop control of engine management systems for a large number of inexpensive low-displacement motorcycles in markets like China and other Asian countries. Specific low-cost Electronic Fuel Injection (EFI) systems have been developed or are under development to meet these requirements. This study presents a comparison of heated versus unheated oxygen sensors in such a system. The exhaust gas temperature rise and variation during the emission test cycle in this class of motorcycles and its impact on the light-off time, the dynamic response behavior as well as other small engine-specific parameters are investigated. Most experiments have been carried out on a 125cc motorcycle equipped with water-cooled, 4-stroke engine with 3-way catalyst.