Advanced science.  Applied technology.


Method and Apparatus for Controlling Exhausted Gas Emissions During Cold-Start of an Internal Combustion Engine: 6,832,472


An in-cylinder ion sensor provides a signal representative of the air/fuel ratio of the charge mixture as an engine starts. The signal representative of the air/fuel ratio is used as a feedback signal for an electronic control unit to perform cold-start closed-loop control during an initial operating period from a cold-start before an on-board oxygen sensor is able to warm up. After reaching a functional operating temperature, the oxygen sensor provides a signal that is used as an adaptive calibration tool which allows the electronic control unit to calibrate the ion sensor signal and use that signal for controlling the air/fuel ratio during cold start operation.

Patent Number: 
Date Of Issue: 

Yiqun Huang; Joseph Grogan