Forced Idling Regime of Automobile Engines

Abstract

This paper presents the factors affect the idling regime (mode) for the motor car engines, such factors include time of travel, gender of the driver, distance of travel and road conditions. Working conditions of the car engine in its compulsory free rotation is discussed too. This condition is occurred to the engine of the car when the foot released the fuel pedal and so the throttle status changed during engine work and also the connection of the movement between the engine and the wheels of the car is changed and still be in connection. Through the total movement of the vehicle during empty rotation (idling) of the engine which is frequently repeated during the driving, the car within cities as well as driving on mountain roads this condition may be existed. In this case the number of engine RPM is higher than that of the number RPM at the engine idling, then the reverse movement of the wheels of the car (relatively high speed of the car) is transmitted through the total transmission (complete transmission from the wheels to the engine) of low RPM, which is also called engine braking. This phenomenon will be studied and analyzed to ensure that there will be a reduction in fuel consumptions and low emissions. The study aimed to investigate the inability of reducing fuel consumptions of some automobiles during some travel routes by the presence of forced dealing regime or mode.     In addition to executing many experimental tests on cars with different engine size, travel path, and with different drivers.  And finally studying the factors affects fuel economy of the ICE. It was found that male are better in achieving forced idling conditions, urban areas and highways are better that mountain areas and finally the travel distance and mechanical status of the car may affect the percentage of forced idling regime of the car. The fuel consumptions and emissions in the case of forced idling are noticed to be increased.