| Electromagnetic fuel injector, an important component of EFI (Electronic Fuel Injection) system on the petrolic internal combustion engine, directly determine the fuel economy, motivity and emissions of internal-combustion engine. Its fuel consumption is very important in engine system design. In order to research and develop FAI (Free Armature Injection) technic further , and improve the application of the FAI Injector, it is very necessary to develop an instrument which can measure fuel performace of FAI injector accurately and quickly. Two fuel performace measuring method, volumeter and Bosch pressure meter based, are introduced in this paper. On the one hand, based on the principle of volumeter, fuel injected by FAI injector is congregated to a steady flow during working period of engine. MCU (Micro Control Uinit) computer technology applied in such meter, the average periodic flowrate can be conducted by the steady flowrate and fuel injection frequency. The steady flowrate can be derived from the result that the injection time is divided by fuel volume, and fuel injection frequency is outputted by fuel injection circuit model. Using the method, the average flowrate can be measured. On the other hand, based on the special process of pulsant injection from FAI injector, a Bosch pressure meter which can be used to qualitatively analyse instantaneous flowrate has been developed. This meter , and the above volumeter, have put good effect in practice.
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