CN2445967Y

CN2445967Y - Digital liquid level indicator

Info

Publication number: CN2445967Y
Application number: CN 00248841
Authority: CN
Inventors: 邱春富; 张立松; 刘志猛; 李文汇; 祝新立
Original assignee: Research & Design Inst Zhongguo Qingqi Group
Current assignee: Research & Design Inst Zhongguo Qingqi Group
Priority date: 2000-10-13
Filing date: 2000-10-13
Publication date: 2001-09-05
Anticipated expiration: 2010-10-13

Abstract

The utility model relates to a digital liquid level indicator measuring and displaying the liquid volume of an irregular container, which is an electronic meter. The utility model comprises a micro processing unit which is composed of an SCM 1 and an EEPROM 2. The utility model is characterized in that a liquid level sensor 4 is connected with an A/D converter 3 which is connected with the SCM 1 to constitute an input circuit, and the output port of the SCM 1 is connected with a display circuit composed of a drive circuit 5 and digital tubes 6, and an alarm display 7. The utility model overcomes the inconvenience for use brought by the error generated by the irregular shape of the oil tank and has the advantages of accurate metering, directness and reliability, and the utility model can be used as an oil meter on high-grade motorcycles.

Description

Numeral liquid measure telltale

The utility model discloses a kind of digital liquid measure telltale that can measure the irregular liquid in containers volume of demonstration, belong to the electronic measurement equipment technical field.

The oil mass instrument of measuring amount of fuel commonly used adopts analogous circuit more in the vehicle such as automobile, motor bike, blimp, and the electric signal of sensor acquisition is carried out the circuit conversion, demonstrates the oil mass value.When the out-of-shape of fuel tank, can produce bigger error, make troubles to use.

Goal of the invention of the present utility model provide a kind of can be with the form of numeric display, accurately show the digital liquid measure telltale of liquid measure value in the irregular container.

Technical characterictic of the present utility model is to have adopted micro controller system 1, EEPROM and A/D converter 3 to form microprocessing unit, the electric signal that level sensor 4 is gathered is handled, and the result that will handle shows by driving circuit 5 and charactron 6, thus the measurement process of finishing.

Below by Figure of description, the utility model is described in detail: a kind of digital liquid measure telltale, comprise the microprocessing unit that micro controller system 1, electrically programmable EROM 2 are formed, it is characterized in that liquid measure sensor 4 connects an A/D converter 3 and is connected to form input circuit with micro controller system 1; The delivery port of micro controller system 1 is connected with attention display 7 with the output display circuit that driving circuit 5, charactron 6 constitute.

Principle of work of the present utility model is as follows:

Earlier install the duplicate sampling instrument of hardware configuration therewith an irregular fuel tank is sampled, write down the cooresponding A/D conversion value of each oil level, this conversion value table and program are solidificated in the chip together with one.During practical application, fuel level sensor is acquired signal at regular intervals, with A and D converter this voltage signal is converted to digital signal, sends into treater and the A/D conversion value compares, thereby draws corresponding oil level value.This oil level value send charactron to show.

For improving the stability and the accuracy of device, taked following measure.

(1) vehicle is in operation and produces very big vibrations, liquid level fluctuates, the oil level value of sensor acquisition also produces very big skew, adopt comparison method to remove the amount of deflection in the program of this device, also adopted and repeatedly added and ask average method, by these two kinds of algorithms, system accuracy and stability have been improved.

(2) adopt EEPROM to correct zero point, because the difference between each fuel level sensor, the cooresponding A/D conversion value of identical oil level may be different, adopt EEPROM to carry out linear rectification in the program.Promptly use EEPROM memory error value, again the A/D conversion value is carried out linear compensation after the program run, eliminate error.This device adopts the method for interrupting that the error amount that EEPROM write down is carried out zero clearing.

(3) adopt light-emitting diode that low on fuel is reported to the police, when oil level was lower than certain value, program made lumination of light emitting diode to the position, a certain position of port, can remind the user to refuel.

The utility model has the advantages that accurate measurement, intuitive and reliable, can be used for using as oil measurer on the high-grade motor bike.

Figure of description 1 is a block diagram of the present utility model, and accompanying drawing 2 is circuit diagrams of embodiment.

Embodiment of the present utility model sees accompanying drawing 2, is used for motor bike, and automobile battery is as working power, battery tension is generally+12v about, and the voltage of micro controller system is generally+5v about, therefore carry out voltage transformation with a slice 7805 chips.

Micro controller system 1, A/D converter 3 adopt the PIC16C711 chip.Chip integration becomes 8 A/D converters, and the power-handling capability of I/O mouth is big, can direct drive charactron, therefore can reduce the quantity of peripheral chip, improve system stability.The A/D converter of PIC16C711 chip internal has four tunnel input channels, and all analog input channels adopt a sampling holder in the chip, and A/D converter is a successive approximation.There are much relations in the concussion source of A/D conversion accuracy and transfer time and employing, and 32 frequency divisions of clock are adopted in the concussion source of this machine, and crystal oscillator adopts the XT crystal.PIC16C711 has two port A and B, and each I/O mouth can be imported electric current and the output 20mA electric current of 25mA, 7 sections of mouthful RB1～RB7 direct drive light-emitting diode display.Mouth RA2～RA3 is as the scan control line, and RBO is an interrupt input line, and RAO is a sensor input line, and RA1 is the alarm control line.

Fuel-quantity transducer 4 is a potential device, and travelling arm is connected to Chip Microcomputer A 0 analog input channel by RC network.

Electrically programmable EROM 2 has adopted serial EEPROM, and this EEPROM has eight pins, and a pin is an Enable Pin, and two pin are the clock input, and tripod is a quantitative data input, and four pin are the data outputs, connects the RA0～RA3 of micro controller system respectively.

The charactron 6 of display part adopts seven segment digital tubes, for improving the brightness of telltale, has adopted the common cathode pipe, shows that dynamically by finishing with the series connected transistor switching circuit of charactron, frequency is 100HZ.

Attention display 7 adopts the LED light-emitting diodes resistor R 14 of connecting to connect formation with a mouth RA1.Attention display 7 can also adopt the form of micro controller system direct drive charactron 6 flickers to replace.

Claims

1, a kind of digital liquid measure telltale comprises the microprocessing unit that micro controller system (1), electrically programmable EROM (2) are formed, and it is characterized in that liquid measure sensor (4) connects an A/D converter (3) and is connected to form input circuit with micro controller system (1); The delivery port of micro controller system (1) is connected with attention display (7) with the output display circuit that driving circuit (5), charactron (6) constitute.

2,, it is characterized in that micro controller system (1), A/D converter (3) adopt the PIC16C711 chip according to the said digital liquid measure telltale of claim 1.

3, according to the said digital liquid measure telltale of claim 1, it is characterized in that fuel-quantity transducer (4) is a potential device, travelling arm is connected to the A0 analog channel by RC network.

4,, it is characterized in that electrically programmable EROM (2) has adopted serial EEPROM according to the said digital liquid measure telltale of claim 1.

5, according to the said digital liquid measure telltale of claim 1, it is characterized in that the charactron (6) of display part adopts seven segment numerical common cathode pipe, dynamic display circuit is by forming with the series connected transistor switching circuit of charactron, and frequency is 100HZ.

6,, it is characterized in that attention display (7) adopts the LED light-emitting diode resistor R 14 of connecting to connect formation with a mouth RA1 according to the said digital liquid measure telltale of claim 1.