Patent ID: 6513502
Filing Date: 2003-02-04
Classification: F02D

Abstract:
A system for estimating a needle lift of an injection system including an armature for regulating pressure in a pressure control chamber and a needle for opening or closing a fuel injection hole, the system comprising an observer for measuring a solenoid current and estimating an armature lift and an armature speed, wherein the observer acquires the solenoid current, the armature lift, and the armature speed through the following equations:{tilde over ({dot over (x)})}1=&Dgr;f1âˆ’h1(x1âˆ’{circumflex over (x)}1)âˆ’k1sign(x1âˆ’{circumflex over (x)}1) {tilde over ({dot over (x)})}2=&Dgr;f2âˆ’h2(x1âˆ’{circumflex over (x)}1)âˆ’k2sign(x1âˆ’{circumflex over (x)}1) {tilde over ({dot over (x)})}3=&Dgr;f3âˆ’h3(x1âˆ’{circumflex over (x)}1)âˆ’k3sign(x1âˆ’{circumflex over (x)}1) wherein &Dgr;fi is fi(x,u)âˆ’fi({circumflex over (x)},u),and wherein the needle lift is estimated through the following equations:{circumflex over ({dot over (x)})}1=f1({circumflex over (x)}, u)+h1(x1âˆ’{circumflex over (x)}1)+k1sign(x1âˆ’{circumflex over (x)}1) {circumflex over ({dot over (x)})}2=f2({circumflex over (x)}, u)+h2(x1âˆ’{circumflex over (x)}1)+k2sign(x1âˆ’{circumflex over (x)}1) {circumflex over ({dot over (x)})}3=f3({circumflex over (x)}, u)+h3(x1âˆ’{circumflex over (x)}1)+k3sign(x1âˆ’{circumflex over (x)}1) {circumflex over ({dot over (x)})}4=f4({circumflex over (x)}, u) {circumflex over ({dot over (x)})}5=f5({circumflex over (x)}, u) {circumflex over ({dot over (x)})}6=f6({circumflex over (x)}, u) {circumflex over ({dot over (x)})}7=f7({circumflex over (x)}, u) wherein x1 is a solenoid current, x2 is an armature lift, x3 is an armature speed, x4 is a pressure of the armature chamber, x5 is a pressure of the pressure control chamber, x6 is a needle lift, and x7 is a needle speed.