Abstract:According to the control system composition and working principle of AVNT, mathematical model of AVNT valve with cam position feedback signal was established, stability performance and characteristic of current-angle were analyzed. Simulation results show that gain margin and phase margin can make control system with guaranteed stability and better dynamic characteristics. Feasibility of the simulation model was verified by the experiments of crankshaft angel changing with input current after AVNT valve was installed in turbocharger.