On-Line Identification of Time Delay in the Fuel Path of an SI Engine Swiss Federal Institute of Technology (ETH)

Format:

Conference/Event

Author/Creator:

Shafai, Esfandiar, author.

Conference Name:

International Congress & Exposition (1997-02-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1997

Summary:

The dynamics of the fuel-path subsystem of an SI engine, between fuel injection command signal and measured air-to-fuel ratio, is modeled approximately by a series connection of a first-order low-pass filter and a time delay element. The three parameters involved in this approximation, id est, the time constant and the gain factor of the low-pass filter as well as the time delay, depend on the operating point of the engine.In order to design a gain-scheduled controller for the entire operating range of the engine, the parameters are identified for a number of operating points. For the automation of the parameter identification of all operating points desired, an on-line identification based on the recursive least-squares method is used. The algorithm for the decision of whether to increase or decrease the integer part of the current estimated time delay, which is a multiple of the sampling period, is based on an estimation of the fractional part of the time delay at each point.Simulation results as well as experimental results on a dynamic engine test bench illustrate the performance of the estimation algorithm in one operating point of the engine

Notes:

Vendor supplied data

Publisher Number:

970613

Access Restriction:

Restricted for use by site license