Method and System for Testing the Working Characteristics of Vehicle Fuel Injector

Abstract

Background: The vehicle fuel injector directly affects the power performance, emission characteristics and economic efficiency of the engine. At present, several testing standards are stipulated on accurate measurement of the working characteristics of fuel injectors. Objective: The purpose of this study is to provide an efficient patent about the method and system for testing the working characteristics of vehicle fuel injector. Methods: Two key techniques are significant to establish the standard test environment. The patent about the pressure control approach and injector driving method was proposed. The adaptive fuzzy PID approach is applied in pressure control. An adaptive multi-functional driver was designed and developed for both the voltage-driven and current-driven port fuel injectors. Results: The experiments on the two key technologies were operated. During the dynamic flow test, the settling time using the system was 1ms. For the static flow test, the settling time was 1 s. The maximum changing rate of the pressure fluctuation was 1%. Then the system was verified by test on the flow characteristics and dynamic response of the voltagedriven and current-driven injectors. The linear deviation of each dynamic flow curve is between ± 3% to ± 6%. Furthermore, the deviation of the dynamic flow curves from the repeated test is small. The maximum deviation of the static flow results is less than 4%. And the dynamic response of the injector varies with the change of the pressure. Conclusion: The system meets the requirements of the related standards. The experimental results prove that the system is stable and reliable.

Comparison between Hybrid and Fuel Injection Motorbikes

“…The injection system is controlled using an electronic circuit that allows the proper air mixture into the chamber. The fixed ratio is around 14.7:1, meaning that for every one part of fuel 14.7 parts of air are required for combustion to be effective [12]- [14]. Fig.…”