Charles F. Aquino

Transient A/F Characteristics for Cold Operation of a 1.6 Liter Engine with Sequential Fuel Injection

An investigation of transient A/F characteristics was conducted using a 1.6 liter engine equipped with a Sequential Electronic Fuel Injection (SEFI) system. The engine was tested on a dynamometer facility capable of providing environmental temperatures as low as 10˚F. A test procedure was developed to determine the effects of steady state A/F, engine speed, size of throttle ramp, injection timing, and hardware changes, on the transient A/F characteristics while the engine warmed up

STEADY-STATE AND TRANSIENT A/F CONTROL REQUIREMENTS FOR COLD OPERATION OF A 1.6 LITER ENGINE WITH SINGLE-POINT FUEL INJECTION

An engine dynamometer test facility capable of controlling temperatures from 0/sup 0/F to 150/sup 0/F was used to investigate A/F control characteristics of a 1.6 liter engine with single point fuel injection. Two types of tests were run. In the first, the effect of induction system temperature on manifold wall wetting and transient A/F control was determined. In the second, a cold start procedure was developed to determine the effect of engine temperature on the percent of fuel which burns by observing exhaust A/F during steady-state operation while the engine warms up. It was found that transient A/F control problems due to manifold wall wetting are much greater than steady state problems associated with incomplete fuel burning.