en موتور احتراق داخلی Internal Combustion Engines (ICE, ...) پژوهشي Research <table align="center" class="MsoTableGrid" style="border-collapse:collapse; border:none"> <tbody> <tr> <td style="width: 407px; padding: 0in 7px; height: 90px; text-align: justify;" valign="top"><span style="font-size:10pt"><span new="" roman="" style="font-family:" times="">In this article, the effect of the usage of variable speed electric water pump on the cooling system of a type of passenger car engine has been investigated. The engine water circulation in most of today&#39;s cars uses a mechanical method, the power required for its circulation is provided by a belt with a ratio of 1:1 from the crankshaft. This action makes the changes of the water pump speed a function of the engine speed and there is no control over it. One way to solve this problem is to use an intelligent thermal management system. In this method, some components of the cooling system, including the electric water pump, are controlled based on the working conditions and engine temperature. In this research, GT Suite and Simulink software were used simultaneously, and for this purpose, the engine cooling circuit with a mechanical water pump was simulated in GT Suite software and the accuracy of laboratory values was verified in terms of heat transfer. Then the mechanical connection of the water pump was disconnected and the water pump circuit was controlled with an electric motor. In the next step, in order to obtain the control pattern, the electric water pump was replaced with the mechanical water pump in the simulation pattern. The results of the software and experimental simulations of the intelligent cooling system showed a 13.4% reduction in engine warm-up time.<span style="color:black"></span></span></span></td> </tr> </tbody> </table> Electric water pump, Variable speed, Engine cooling system, Passenger car, Mechanical water pump 4243 4255 http://ase.iust.ac.ir/browse.php?a_code=A-10-427-3&slc_lang=en&sid=1 Mansour Baghaeian ma.baghaeian@iaum.ac.ir 180031947532846004196 180031947532846004196 Yes Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran Khajeh Morad Sharghi shir1mob.ir@gmail.com 180031947532846004197 180031947532846004197 No Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran