A Study on Knocking Analysis Simulator Based on CRDI Engine ECU
In order to meet the recently enhanced emission standards at home and abroad by applying CRDI (Common Rail Direct Injection) diesel engines to industrial engines, this study developed the CRDI ECU control algorithm that users can adjust fuel injection timing and amount. This study aimed to improve fuel economy and to reduce harmful gas emissions effectively by developing the algorithm distinguishing diesel knock and long tooth with the use of CKP and CMP sensors among the input factors of CRDI engine control ECU, and by adjusting engine balance through the development of algorithm that can determine when adjusting the fuel injection timing and amount, and distinguish abnormalities of engines.
Vehicle Diesel Engines
The diesel engine came to be used as a car engine relatively late after the first demonstration of its operation in 1897. The introduction of the first mass produced diesel passenger cars in 1936 finally enabled diesel engines to vie with the dominant gasoline engines of the day as an alternative drive concept in this segment too.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.