Aisan Fuel Injector for Multipoint Injection System

The relation between the dynamic control range and the valve behavior has been studied. The results show that reduction of valve bounce and short valve closing time are important to the expansion of the dynamic control range. Non-linearity of fuel flow at short pulse widths is caused by the valve bounce and inertia force. Therefore, lessening valve weight is very effective to obtain good linearity. Our valve is composed of a steel ball, a pipe and an armature welded together by laser, and the weight is reduced to half of a conventional pintle needle. The valve is closed only by spring force. While satisfying minimum operating voltage; 6 V, dimensional factors were optimized to obtain higher spring preset load. This made it possible to reduce the valve closing time. Consequently this injector exhibits a greater dynamic control range.