EXPERIMENTAL STUDY THAT DETERMINE THE LAW OF IDLE SPEED VARIATION OF DIESEL ENGINE USING COMMONRAIL FUEL INJECTION

Abstract

The idle speed (nIdle) is a critical parameter that impacts engine performance,
fuel efficiency, and emissions. The electronically controlled fuel injection system
(EFI) engine’s idle speed varies widely and depends on several different operating
parameters of the engine and vehicle, including coolant temperature, battery
voltage, transmission gear position, use of air conditioning or cabin heater, among
others. Currently, manufacturers generally do not disclose the idle speed control
law for electronic fuel-injected diesel engines. This article presents the results of
an experimental study that determine the law of idle speed variation of the
Hyundai 2.5TCI-A diesel engine according to some key operating parameters. The
article’s results can be untilized to refine the working cycle simulation model and
develop control programs for the engine control module (ECM) of Common Rail
(CR) diesel engine.