Application And Research Of MC68HC908 Microcontroller In Engine Test-bed Experiment

With the development of the research on electronic control engine, new requirement has been put forward to the engine test. The automatization of engine test has become one of the most important methods to improve the efficiency and quality of the engine test. After investigating various automated measurement techniques home and abroad, a microcontroller -based automated data acquisition and control system of engine test is given in this dissertation, and the acquisition and control program is accomplished. This research has made a foundation for the automatization for our engine laboratory. The development method of the system is valuable for popularizing.Hardware designing has been modularized. Hierarchy schematic diagram can not only shorten the design period, but also make management and correction easy. In PCB, anolog circuits are divided from digital circuits, which improve the stability of the system.In course of hardware and software being designed, many anti-jamming measures have been adopted to improve EMC. To finish the development, on-line, non-real-time emulation and debugging is done with self-made Programmer Adapter, MC68HC908GP32 Programmer and Monitor ROM developed by Tsinghua University and emulation software kit made by MOTOROLA Inc.This microcontroller control engine test system has some characteristics as follows: l.The performance test is engine test chief research object and meets the main demands of the engine test.2.It has considered the practicality, interchanges ability and economy, uses a PC microcomputer as the system kernel, selects other parts meeting industry standard. It also introduces the "supervising curve", so the test engine could control the test momentarily.3. It uses a MC68HC908GP32 to control the data acquisition and the dynamometry. This system can meet the demands of current engine test which are high precision, high speed and high efficiency. 4. We developed the entire software by Delphi under Windows operating system. It has friendly graphic user interface, flexible operating manner, and powerful data processing function.5.This test system can not only largely improve testing precision and reliability, but also accomplish experiments of variable working condition that can not be completed under manual control.