Design Of Diesel Engine Cooling Water Temperature Control Based On Single Chip Microcomputer

Along with energy crisis, and people think more of comfort when driving car of diesel engine, more and more scientific research organization attach importance to it. Cooling water temperature is every important to diesel engine. If cooling water temperature can keep in the first-rank range of cooling water temperature, diesel engine's power can be improved, and less exhaust gas produced, reduce fuel wastage, and engine work more calmly. So-called the first-rank temperature rank is diesel engine work best and cost least. In order to get this temperature rank we must do much experimentation and data analysis. First of all we should know the cooling water temperature affect piece part's wear and tear, yawp, exhaust quality, lubricating oil, engine's life etc, than we should deal with data that we got from experimentation, finally we can get the first-rank range of cooling water temperature. A necessary condition to do forenamed experimentations is a control who can make cooling water temperature in certain rang, and we can exchange rang. Design the control is my aim.Diesel engine's cooling water temperature control based on 89S52 single chip microcomputer, in order to make cooling water temperature re fall down by putting cool water into water tank, and letting out hot water from water tank. We can change the temperature range by using the 5 keys on control, and the temperature displayed on the control. This control can send data to PC via serial communication.With the highly speedy development of Large Scale Integration Technology, especially with the enhanced performance and reduced price of single chip microprocessor, which make it possible to design such a control. How to apply the single chip microcomputer to diesel engine automation control realm, it becomes the one of questions for discussion in diesel engine automation. This work of this monograph adapts to the development tendency. It provides a necessary condition for more study on diesel engine.This paper introduces that the construction of hardware circuit and the design of PID control software of the system based on 89S52 single chip microcomputer. The principle and method of measurement circuit, precision and plifier circuit, A/D circuit, single and expand circuit, keyboard and show circuit, serial communication circuit is discussed. The principle and procedure of software design are described.