Variable　Nozzle　Turbocharger　(VNT)　was　invented　to　solve　the　problem　of　matching　an　ordinary　turbocharger　with　an　engine.　VNT　can　harness　exhaust　energy　more　efficiently,　enhance　intake　airflow　response　and　reduce　engine　emissions,　especially　during　transient　operating　conditions.　The　difficulty　of　VNT　control　lies　in　how　to　regulate　the　position　of　the　nozzle　at　different　engine　working　conditions.　The　control　strategy　designed　in　this　study　is　a　combination　of　a　closed-loop　feedback　controller　and　an　open-loop　feed-forward　controller.　The　gain-scheduled　proportional-integral-derivative　(PID)　controller　was　implemented　as　the　feedback　controller　to　overcome　the　nonlinear　characteristic.　As　it　is　difficult　to　tune　the　parameters　of　the　gain-scheduled　PID　controller　on　an　engine　test　bench,　system　identification　was　used　to　identify　the　plant　model　properties　at　different　working　points　for　a　WP10　diesel　engine　on　the　test　bench.　The　PID　controller　parameters　were　calculated　based　on　the　identified　first-order-plus-dead-time　(FOPDT)　plant　model.　The　joint　simulation　of　the　controller　and　the　plant　model　was　performed　in　Matlab/Simulink.　The　time-domain　and　frequency-domain　performances　of　the　entire　system　were　evaluated.　The　designed　VNT　control　system　was　verified　with　engine　tests.　The　results　indicated　that　the　real　boosting　pressure　traced　the　target　boosting　pressure　well　at　different　working　conditions.