Behaviour of a Closed Loop Controlled Air Valve Type Mixer on a Natural Gas Fuelled Engine Under Transient Operation University of Toronto

Format:

Conference/Event

Author/Creator:

Jääskeläinen, Hannu E., author.

Conference Name:

Future Transportation Technology Conference and Exposition (1995-08-07 : Costa Mesa, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1995

Summary:

ABSTRACT.Many current aftermarket natural gas conversions of gasoline fuelled spark ignited engines use an air-valve type mixer with closed loop control of the gas pressure. This control is often provided by an electronic integral controller that uses the output from an exhaust gas oxygen (EGO) sensor to control the duty cycle of a solenoid valve. By varying the duty cycle of this fuel control valve (FCV), the average pressure in the low pressure regulator (LPR) reference chamber and thus the gas pressure can be varied. The transient behaviour of these fuel systems is affected mainly by the mechanical response of the gas mixer and the LPR. The electronic controller can provide compensation only after the EGO sensor has detected an air-fuel ratio excursion.The main weaknesses of this type of fuel system seems to be associated with the finite response of the mixer and the LPR and by the use of an airflow dependent vacuum signal strength for control. In order to achieve improved performance from this type of system, close attention should be paid to these parameters

Notes:

Vendor supplied data

Publisher Number:

951911

Access Restriction:

Restricted for use by site license