Improved method for computer system of AVL 657 type internal combustion engine testing instrument

Abstract

The invention relates to the improved computer used for the tester AVL657 model internal-combustion engine. The system includes the AVL657 microprocessor, A / D converter, the data storage, the graph plotter, and the printer. The characters of the invention are as follows. AVL657 function solidified software microprocessor is connected to the two serial ports of PC through the serial cable. The corresponding two signal grounds and two case grounds are connected. The transmitting end and receiving end of AVL657 are connected to the receiving end and transmitting end of PC. The communication software written in QABSIC 4.5 receives the measurea data, the graphics and command codes and deciphers the received two dimension data and the graphics codes. The filtering program processes the command codes so as to show the correct AVL657 commands on the screen.

Description

technical field [0001] The present invention relates to a computer system used in internal combustion engine measuring devices, in particular to an improvement method for the computer system of an AVL657 type internal combustion engine tester (hereinafter referred to as AVL657). Background technique [0002] The AVL657 internal combustion engine tester produced by the Austrian Liszt Internal Combustion Engine and Testing Equipment Company, which was imported in large quantities in my country, has a data acquisition and analysis system mainly composed of an AVL657 microprocessor and a PDP11 / 23+ small computer system including functional firmware. DEC Corporation of the United States has stopped producing this type of computer. Once the computer is damaged, the instrument will not be able to be used. The reason is that the AVL657 data output method is printer, plotter and 3 or 8 o'clock floppy disk, a large number of tests and analysis The data are all stored in the floppy dis...

AI Technical Summary

Problems solved by technology

DEC Corporation of the United States has stopped producing this type of computer. Once the computer is damaged, the instrument will not be able to be used. The reason is that the AVL657 data output method is printer, plotter and 3 or 8 o'clock floppy disk, a large number of tests and analysis The data are all stored in the floppy disk of the PDP11 / 23+ computer (the computer system has no hard disk), and the data format stored in the floppy disk by the AVL657 function is the AVL SAT format, which is not compatible with the IBM format in the current PC, that is, the AVL657 Acquisition and processing and calculation and analysis results developed in PDP11 / 23+ computers cannot be directly stored in the PC

On the other hand, the VT100 terminal in the PDP11 / 23+ computer system is connected to the AVL657 microprocessor, and the AVL657 analyzer is operated on the VT100 terminal. If the VT100 terminal is damaged, the AVL657 analyzer cannot be used

Moreover, the original analysis function of AVL657 is less, and the software is solidified, which cannot be added or changed. The software developed in the PDP11 / 23+ computer equipped with AVL657 in the early stage was realized by using FORTRANIV development tools in the RT11 operating system. Its interface design, calculation accuracy, calculation Many aspects, such as speed and program capacity, are far from the environment of the modern PC system software development platform, and have completely failed to meet the requirements of modern scientific research, teaching, testing, etc.

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