A Characteristic Study of Electronic In-line Pump System for Diesel Engines

A new fuel injection equipment, the Electronic In-line Pump (EIP) system has been developed in this paper, in order to meet China's PHASE III emission regulation. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics, i.e. injection pressure, injection rate, injection duration at different operating conditions, etc. To validate these predictions, experimental tests were conducted at the same model conditions. The results are quite encouraging, and in agreement with model predictions. Additional experiments were conducted to study the injection characteristics of the EIP system. These results show that the injection pressure and injection quantity are insensitive to injection timing variation due to the design of constant velocity cam profile. Furthermore, the injection quantity vs. pulse width at different cam speeds, an important injection characteristic for EIP system calibration, is presented.