UDM Tip Temperature Control using Thermosyphon Principle

In today’s automobile industry where BS6 is posing a high challenge and with limited timeline. The main target is to provide the cooling system to have less impact on the in terms of cost, weight and meeting challenging engineering requirement. Thus, the frugal engineering comes into the picture. An important technology that has come into highlight in recent years is the application of thermosyphon principle for UDM injector cooling thereby reducing the rotation parts and power consumption such as an electric pump. Thermosyphon is a method of passive heat exchange and is based on natural convection, which circulates a fluid without the necessity of a mechanical or electric pump. The natural convection of the liquid commences when heat transfer to the liquid gives rise to a temperature difference from one side of the loop to the other. The Flow through the UDM is maintained by changing Temperature (hence density) of the fluid at one end using the force airflow. The main objective of the UDM cooling is to keep the UDM tip temperature below 120 degC to increase the life of the injector. The temperature of the tip to be under control during the vehicle RWUP running condition with regeneration and service regeneration followed by hot shutoff. The comparison study is done with conventional electric pump and thermosyphon circuit for Vehicle Max Speed and Vehicle Max torque and Service regeneration. The results are discussed and concluded in the paper.