Research On Measuring System Of Engine And Its Intelligent Control

With the development of modern engine technology, the acquisition of the data which represents the performance of engine in different working conditions becomes more and more important. Usually, dynamometer is assumed to take this responsibility. Accordingly, the demanding for accuracy and stability of the data acquisition system is emergent. At the same time, the improvement of micro processors and introduction of computer technology make the above demanding become approachable.The main topic of this paper is the research about eddy current dynamometer. Data acquisition circuit and PC software is redesigned, and some new devices are used to modify the Engine-Dynamometer system. In addition, the controlling of the system is carefully studied. The main productions of the paper include the following:1. With the understanding of dynamometer's working principles, the signals which should be measured are analyzed and circuits are redesigned. The MSP430F449 is chosen for the ECU, and in it USB communication protocol is coded. Then, some measures both in hardware and software are taken to reduce the disturbance.2. Develop the PC software with good man-machine interface. It achieves the function of real time data acquisition and processing. In addition, the software is equipped with the database function which makes the post processing of colleted data easier.3. The Engine-Dynamometer model is acquired after a literature search of both engine and dynamometer models. Fuzzy controller is designed in SIMULINK. The self-tuning module is developed to change the scale factor dynamically. Finally, the simulations in different working conditions indicate that the fuzzy controller can achieve the requirements.