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$Annubar^{(R)}$형 차압유량계 형상 개선에 따른 유량 특성 연구
오대산,이충훈,Oh, Dae-San,Lee, Choong-Hoon 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
The inner structure of the triangular separate bar (TSB) was improved to enhance the productivity of the TSB flow meter by simplifying the machining process for making the flow meter. The cross section of upstream and downstream pressure chamber in the TSB was changed from triangle to circle, which make it possible to substitute the wire cutting by drilling in the process of machining the pressure chamber. The flow rate characteristics of the flow meters was calibrated with a laminar flow meter. Six kinds of flow meters whose diameters of pressure tap for measuring pressure of both upsteam and downstream pressure chamber were different one another were made. The effects of the pressure tap diameter on the flow rate characteristics of the TSB flow meter was little. The mass flow rate characteristics of the flow meters with increasing a non-dimensional parameter which includes the gas temperature, exhaust gas pressure and differential pressure at the flow meters and atmospheric pressure shows nearly linear relationship with a correlation coefficient of R=0.998.
FTP-75 냉간 주행 모드로 운전하는 차량의 연료분사 모사시스템에 관한 연구
오대산 ( Dae San Oh ),이충훈 ( Choong Hoon Lee ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.2
A fuel injection system which is operated with a real vehicle driving simulation was developed as an alternative to a vehicle test for the fuel injectors. The sensor signals that are supplied to the ECU were measured and recorded as a data file for a vehicle driven in FTP-75 mode in a chassis dynamometer. The imperative sensor signals of the throttle position, vehicle speed, engine speed, crank position, cam position, intake air flow, and cooling water and intake air temperature were reconstructed using FPGA DAQ boards and a PXI computer. The scanning results showed good agreement with the input signals that were reconstructed. The ECU HILS system operated successfully to drive six fuel injectors, which injected fuel in the same pattern as if they were mounted in the vehicle driven in FTP-75 mode. Also, the fuel injection system developed in this research shows the possibility of application in evaluating the characteristics of fuel injection rate for injectors according to properties of injected fuel with the real driving mode of vehicles.
기체 온도가 Annubar<SUP>Ⓡ</SUP>형 차압유량계 유량 특성에 미치는 연구
오대산(Daesan Oh),박동선(Dongsun Park),이충훈(Choonghoon Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
A shape improved flow meter which has a similar structure of Annubar<SUP>®</SUP> type flow meter was designed and its flow rate characteristics were evaluated by calibrating the flow rate of the flow meters. The supplying air temperature was maintained constantly by controlling power supply to electric heater during the calibration. Two kinds of differential pressure measured at the flow meter were used in calculating the H parameter which represents characteristics of the flow meter. The H parameter was calculated based on the differential pressure which is the difference between upstream and downstream pressure tabs of the flow meters. The other parameter was calculated based on the differential pressure which is the difference between upstream pressure of the flow meter and static pressure ,that is, the dynamic pressure of the flow in the flow meter. Relationship curves between the non-dimensional parameters and mass flow rate at the flow meter were obtained. The curve based on the differential pressure obtained from the difference between up and down stream pressure tabs show different gradients with varying the controlled air temperature. However, the other curve based on the dynamic pressure shows the same gradient with varying the air temperature.