Abstract
Long term control of the AFR (Air/Fuel Ratio) of spark ignition
engines is currently accomplished with a self-oscialling PI
control loop. Because of the intake/exhaust time delay, the
oscillation frequency and hence bandwidth of this loop is small.
This paper describes a new approach to the design of this control
loop using a novel observer system. In this way the bandwidth of
this important loop is increased by a factor of 2 - 6 times,
leading to more accurate oberall AFR control. Moreover the
observer approach is so robust and allows such feedback levels
that it reduces significantly the accuracy required in the
calibration of the base fuel contrl system with which it is to be
used. It can be used with either convention- or advanced observer
based- base fuel strategies.
| Original language | English |
|---|---|
| Title of host publication | SAE Technical Papers |
| Place of Publication | Warrendale PA USA |
| Publisher | SAE |
| Publication date | 1998 |
| Publication status | Published - 1998 |
| Event | SAE Annual International Congress & Exposition 1998 - Detroit, United States Duration: 1 Feb 1998 → 1 Feb 1998 |
Conference
| Conference | SAE Annual International Congress & Exposition 1998 |
|---|---|
| Country/Territory | United States |
| City | Detroit |
| Period | 01/02/1998 → 01/02/1998 |