The Real-time Detection And Analysis Of Powertrain Performance And The Key Parameters Under The Road Test Condition

In recent years, engineers dedicated to engine performance, development and calibration, have been exploring how to predict, detect and control the engine transient process parameters. Due to the limitation of the experimental conditions and methods, most of the tests could only be carried out in the engine test benches. And there were a lot of differences on transient operation parameters between the condition of the vehicle operation and the measurement on the benches. Engine performance in practical operation is determined by the actual operation state of engine operating parameters and the control parameters of the engine. The on-line engine detection operating parameters is very necessary, if you want to get the motor vehicle under the running condition of the engine performance. But the actual state of engine parameters is hard to detect when testing it online.This article is based on the research of aerodynamics, the thermodynamics model and dynamic real-time pressure measured, coupled with the simultaneous solution method of related parameters for testing. The result can be obtained mainly by calculating the three sensor detection method to get into the exhaust manifold, dynamic pressure in cylinder and other data, on the basis of the steady state characteristics of the engine in bench testing. With the intake manifold pressure and speed as a transient condition point, inserting a steady MAP to obtain the operation and performance parameters of the running state of the vehicle such as engine torque and the fuel consumption. The running parameters in the cylinders can be calculated by the dynamic cylinder pressure integral calculation. Through the analysis of each cylinder’s uniformity and transient experiment data, comparing the experimental data validated the correctness of these methods, the accuracy can meet engineering requirements. Then, comparing with the data, we find out the differences between the transient and the steady state. Finally, we have used this method to test an engine for transient analysis of working conditions, and to cross reference the road test performances of other motors and find out the reasons for the differences between performances, and come up with suggestions to improve.Comparative analysis of the experimental data, show that the engine transient condition approximation for a series of steady state conditions of transition. In most cases the vehicle condition and bench conditions transient interpolate results are very close; the deviation of engine control parameters (ignition advance Angle, air-fuel ratio and valve timing) is one of the reasons that caused the different performances; Usually only during small load cases such as the shifting of gears and braking, the vehicle state EFI parameters static calibration and test bench is likely to appear largely deviated.