HSDI 커먼 레일 인젝터의 분사시기 및 분사율 추정

The common-rail fuel injection system is becoming a common technology for High Speed Direct Injection(HSDI) diesel engine. Since the performance of HSDI diesel engine is mainly determined by injection timing and rate, the precise control of the injection timing and rate is important. This study introduces a methodology for estimate of the injection timing and rate of a common-rail injector for HSDI diesel engine. A sliding mode observer is designed to overcome the model uncertainties, based on the nonlinear mathematical model of the common-rail injector. The injector model and the estimator are verified by relevant injector experiments in an injector test bench. The simulation and the experimental results indicate that the proposed sliding mode observer can effectively estimate the injection rate of the common-rail injector.