CN202221430U

CN202221430U - Portable vehicle tachymeter

Info

Publication number: CN202221430U
Application number: CN2011202293526U
Authority: CN
Inventors: 刘娜; 赵德志; 王海磊; 王文涛; 唐健
Original assignee: Shandong Jianzhu University
Current assignee: Shandong Jianzhu University
Priority date: 2011-07-01
Filing date: 2011-07-01
Publication date: 2012-05-16
Anticipated expiration: 2021-07-01

Abstract

The utility model provides a portable vehicle tachymeter including a STC12C2052AD control system module, a photoelectric sensor, a digital tube display module, a 24C04 storage module, a MAX 232 communication module, a power source module, a P521 optical coupling signal processing module, a signal input jack, an AD input jack, a function selecting button and corresponding indicating lamps. The portable vehicle tachymeter in the utility model is suitable for measuring rotate speeds of automobile engines, wheels and the like. Only dry cells are needed for supplying power. The portable vehicle tachymeter in the utility model has characteristics of low volume, low weight, low power consumption, simple structure, complete functions and the like. The portable vehicle tachymeter can be carried conveniently in application. By using the portable vehicle tachymeter in the utility model, not only the rotate speeds of parts in detection can be displayed, but also data can be stored and uploaded to a PC for drawing related linear graphs.

Description

A kind of portable vehicle is used knotmeter

Technical field

The utility model relates to a kind of knotmeter, specifically a kind of based on the STC12C2052AD single-chip microcomputer, can and be depicted as the portable speed-measuring appearance of dependent linearity image with measurement data storage.

Background technology

Rotating speed of automobile engine is a very important index of a kind of measurement automotive performance, and when especially automobile breaks down, yet general knotmeter can only carry on experiment table; Engine speed to experiment is measured, and can not use the application in real life to be very limited out of doors, and therefore normal mensuration to some performance of automobile is brought constant greatly; This just needs a kind of volume little, and light weight is low in energy consumption; Simple in structure, multiple functional, and can not only show rotating speed constantly; Can also and upload to the portable speed-measuring appearance of drawing dependent linearity figure on the PC with data storage, but this knotmeter is not seen as yet at present.

Summary of the invention

To above-mentioned deficiency, the invention provides a kind of portable speed-measuring appearance, volume is little; Light weight, low in energy consumption, simple in structure; Multiple functional, easy to carry when using, can not only show the rotating speed of the parts of surveying constantly; Can also and upload to data storage and draw dependent linearity figure on the PC, only need dry cell that energy is provided.

The utility model is realized through following technical scheme: a kind of portable speed-measuring appearance is characterized in that: it is by STC12C2052AD control system module, photoelectric sensor; The charactron display module, 24C04 memory module, MAX232 communication module; Power module, P521 optocoupler signal processing module, signal input jack; The AD input jack, function selecting button and corresponding pilot lamp are formed.

The T10UT of described MAX232 communication module links to each other with PC through data telecommunication line with R1IN.The RXD of main control chip STC12C2052AD is connected with T1IN respectively at the R1OUT in the MAX232 communication module with TXD in the described STC12C2052AD control system module.Said P521 optocoupler signal processing module signal output part links to each other with the P3.4 pin of STC12C2052AD main control chip.Said function selecting button one end is connected with corresponding pilot lamp respectively, other end ground connection, and STC12C2052AD main control chip detection pin is connected between function selecting button and the corresponding pilot lamp.Described 24C04 memory module read/write pin SDA is connected with P1.1 with STC12C2052AD main control chip P1.0 respectively with clock pin SCL.

Description of drawings

Fig. 1 is a portable speed-measuring appearance front elevation;

Fig. 2 is a upper computer software;

Fig. 3 is a portable speed-measuring appearance internal circuit diagram;

Among the figure: 1 eight digit number sign indicating number pipe display module, 2 add button S5, and 3 subtract button S4,4 little LED lights; 5 external pulse input jack OUT, 6 probe powers and pulse input hole INCOM, 7 function selecting key S3; 8 function selecting key S2,9 function selecting key S1,10 voltage negative pole input hole AD-; 11 positive polarity input hole AD+, 12 data telecommunication lines, 13 battery main switches.

Specific embodiment

When using this portable speed-measuring appearance; Only need know the rotary body of surveying what holes certain distance somewhere circumference has apart from the center; Get into the instrument adjustment modes through function selecting key S3 then; Add button S5 through the right side; Subtract button S4 input and survey the number in the rotary body hole that certain distance somewhere circumference has apart from the center,, through internal circuit MAX232 communication module and data telecommunication line 12 knotmeter is connected on the PC then so that when main control chip STC12C2052AD inter-process signal, directly export the rotating speed of rotary body; The power positive cathode of photoelectric sensor and pickup electrode are injected the probe power and the pulse input hole INCOM hole 6 of knotmeter; Opening power master switch 13, with self can record the rotating speed of current rotary body with the hole of photoelectric sensor alignment probe rotary body, show constantly through eight digit number sign indicating number pipe display module 1; And rotating speed uploaded on the PC through internal circuit MAX232 communication module and data telecommunication line 12, utilize software kit (accompanying drawing 3) to draw the rotation speed change curve and store data; In the time can directly obtaining the tach signal of the object of surveying; If this signal voltage is greater than 6V during less than 25V; Directly signal is inserted external pulse input jack OUT hole 5, deliver to main control chip STC12C2052AD counting after handling through P521 optocoupler signal processing module filtering in the internal circuit, step-down; If this signal voltage during less than 6V, then inserts sensor pulse input hole INCOM hole 6 with signal greater than 3V, directly counted by main control chip STC 12C2052AD.

When carrying out outdoor measurement; Through function selecting key S2 knotmeter is switched to the storage inside pattern; Promptly not only can the survey rotating speed be shown on the eight digit number sign indicating number pipe display module 1 of knotmeter constantly; Can also store in self 24C04 memory module these data are all or part of, measure the back through function selecting key S2 and function selecting key S3 combination, through the MAX232 communication module with institute survey data upload drafting rotation speed change curve and store data in the PC.

When the needs measuring voltage; Only need knotmeter to be switched to the voltage table pattern through function selecting key S1; Institute is surveyed the original paper two ends be incorporated into main control chip STC12C2052AD through voltage negative pole input hole AD-hole 10 and positive polarity input hole AD+ hole 11 respectively, measure.

When needs are measured useful signal width (high level width); Through function selecting key S3, function selecting key S2, function selecting key S1 combination; Knotmeter is switched to measuring-signal width pattern; Introduce signal to main control chip STC12C2052AD through positive polarity input hole AD+ hole 11, measure.

Claims

1. a portable vehicle is used knotmeter, it is characterized in that: it is made up of STC12C2052AD control system module, photoelectric sensor, charactron display module, 24C04 memory module, MAX232 communication module, power module, P521 optocoupler signal processing module, signal input jack, AD input jack, function selecting button and corresponding pilot lamp; The T1OUT of described MAX232 communication module links to each other with PC through data telecommunication line with R1IN; The RXD of main control chip STC12C2052AD is connected with T1IN respectively at the R1OUT in the MAX232 communication module with TXD in the described STC12C2052AD control system module; Said P521 optocoupler signal processing module signal output part links to each other with the P3.4 pin of STC12C2052AD main control chip; Said function selecting button one end is connected with corresponding pilot lamp respectively, other end ground connection, and STC12C2052AD main control chip detection pin is connected between function selecting button and the corresponding pilot lamp; Described 24C04 memory module read/write pin SDA is connected with P1.1 with STC12C2052AD main control chip P1.0 respectively with clock pin SCL.