Research Of Single Chip Computer Controlling The Electronic-Controlled Fuel Injection Pump Test Stand

The performances of diesel fuel injection pump decide the power, economy and emission. The fuel injection pump test stand is an indispensable equipment for researching, manufacturing, testing and adjusting fuel injection pump in the maker and repair factory of the automobile and the diesel engines.The 6PSD30-1 fuel injection pump test stand is the 1970's product and leave unused. Its electrical control part is made up of large discrete components with low-test sensitivity, inconvenient setting and adjustment, high trouble rate. Moreover, Its circuit components are aging and spoiled. This design is rebuilding its electrical control part, designing an automatic control system with automation technology and single chip computer. After rebuilding the test stand, the oil injection times may be presetted, counted and displayed, then stop counting automatically when count completes in measuring oil volume. The drive shaft rotation speed may be presetted, measured, adjusted and displayed. So, the electronic-controlled fuel injection pump test stand will become intelligent stand.The system adopts modular design.8031 single chip computer is the core of this system. It includes two module parts: the oil injection count module and the drive shaft rotation speed module. The two modules also include hardware and soft design.The system composition structure includes 8031 single chip computer, signal test (count sensor and speed sensor), electrical interfaces (amplification shaping circuit, drive, relay, 8155 parallel I/O, 8279 keyboard display, D/A converter) and executive mechanism (electromagnet and electromotor).A control system is connected with peripheral devices including 8155, 8279, DAC0832,sensor detector, power drive interface and executive mechanism on the basis of the 8031 single chip minimal applying system. System hardware design is composed of few electronic devices.The modular design method is adopted in system software design, which programs with MCS-51 assembly language. The whole programs are composed of main program, the oil injection count module program and the drive shaft rotation speed module program.The test stand after being rebuilded can autocontrol the oil injection count and the drive shaft rotation speed, which can be displayed digitally. Compared with primal test stand, it spares units composed of large discrete components, lessens welded points. It greatly improves work reliability, test automation degree, test precision and efficiency. It is convenient for use, maintenance and repair. It has practical meaning with fitting for today's country conditions and conforming today's current of improving automatization degree.