CN102012351B - Portable storage battery electrolyte ultrasonic areometer - Google Patents

Portable storage battery electrolyte ultrasonic areometer Download PDF

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Publication number
CN102012351B
CN102012351B CN2010105020450A CN201010502045A CN102012351B CN 102012351 B CN102012351 B CN 102012351B CN 2010105020450 A CN2010105020450 A CN 2010105020450A CN 201010502045 A CN201010502045 A CN 201010502045A CN 102012351 B CN102012351 B CN 102012351B
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China
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unit
ultrasonic
electrolytic solution
chip microcomputer
picnometer
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CN2010105020450A
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Chinese (zh)
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CN102012351A (en
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李国锋
刘佳鑫
王宁会
王志强
罗德义
肖红军
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大连理工大学
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Abstract

The invention discloses a portable storage battery electrolyte ultrasonic aerometer, belonging to the technical field of electronic density metrical instruments. The portable battery electrolyte ultrasonic aerometer comprises a C8051F120 singlechip as well as an ultrasonic parameter measurement unit, a power supply management unit, a key control unit, a state indication unit, a data output unit, a storage and clock unit and a man-machine interaction unit, which are connected with the C8051F120 singlechip. The portable battery electrolyte ultrasonic aerometer is characterized in that the C8051F120 singlechip is used for controlling the ultrasonic parameter measurement unit, the power supply management unit, the key control unit, the state indication unit, the data output unit and the storage and clock unit, and processing signals obtained by the ultrasonic parameter measurement unit, and meanwhile, the C8051F120 singlechip uploads data measured by the man-machine interaction unit to a computer and responds a control instruction sent by the computer. The portable battery electrolyte ultrasonic aerometer has the main advantages of high measurement precision, fast measurement speed, high automation degree, portable design, online function and the like.

Description

The ultrasonic picnometer of portable storage battery electrolytic solution

Technical field

The invention belongs to electronic type densitometry instrument technical field, relate to a kind of areometer, relate in particular to the ultrasonic picnometer of a kind of portable storage battery electrolytic solution.

Background technology

The open type lead-acid accumulator discharge and recharge and the electrolyte quota process in, often to measure the proportion of electrolytic solution with picnometer, with real capacity arranged to confirm the charging and discharging of accumulator degree.In order to grasp the duty of accumulator and the dump energy of accumulator in real time, the proportion of measuring battery liquid just seems particularly important.The proportion variation range of battery liquid is approximately 1.05-1.30, and range of temperature is approximately 10-50 ℃.

Proportion commonly used at present is in respect of inhaling formula proportion and floating picnometer.These two kinds of picnometers all are to utilize float suffered buoyancy in electrolytic solution to measure electrolyte density.Because sulfuric acid has bigger glutinousness, float is usually sticked on the suction pipe wall, and to read number inaccurate thereby cause; The data that read simultaneously must be converted to the value under the standard temperature (25 ℃) through the proportion chi that converts.Therefore traditional proportion is in respect of shortcomings such as troublesome poeration, precision are low.

Ultrasonic technique is widely used in the characteristics of liquids field of measurement.Utilize the proportion of ultrasonic measurement open type lead-acid accumulator electrolyte, measuring speed is fast, and accuracy of measurement is high.The velocity of sound in the proportion of battery liquid and the electrolytic solution is relevant with the temperature of electrolytic solution.The velocity of sound in temperature through measuring the open type lead-acid accumulator electrolyte and the electrolytic solution can be obtained the proportion of electrolytic solution by experimental formula.

Look into newly through retrieval, the patent No. is that " the Ultrasonic hydrometer " of US4442700A discloses a kind of ultrasonic type picnometer, measures the velocity of sound and electrolyte temperature in the electrolytic solution, and rule of thumb formula draws electrolyte density.This invention uses single ultrasonic transducer to be operated in the travel-time of pulse echo pattern measurement of sound in tested electrolytic solution.Attenuation coefficient is bigger in the electrolytic solution because sound wave actual sound path in tested electrolytic solution is very long, and therefore this method is unfavorable for receiving the measurement of signal.And ultrasonic transducer is exposed among the tested electrolytic solution fully, can make electrolytic solution and transducer enclosure generation chemical reaction inevitably and pollutes tested electrolytic solution, and this can be that accumulator is introduced impurity, the serviceable life of cutting down accumulator greatly.The ultrasonic type picnometer complex operation step of this invention brings very big inconvenience for the operation in the open type lead-acid accumulator environment for use.

Summary of the invention

The purpose of this invention is to provide the ultrasonic picnometer of a kind of portable storage battery electrolytic solution, to solve prior art and shortcoming and defect such as the method measuring accuracy is low, measuring speed slow, complex operation.

Technical scheme of the present invention is following:

The ultrasonic picnometer of a kind of portable storage battery electrolytic solution comprises C8051F120 single-chip microcomputer 1 and the ultrasound parameter measuring unit 2 that is electrically connected with C8051F120 single-chip microcomputer 1 respectively, PMU 3, by key control unit 4, state indicating member 5, data output unit 6, storage and clock unit 7 and man-machine interaction unit 8.

Described C8051F120 single-chip microcomputer 1 is used to control ultrasound parameter measuring unit 2, PMU 3, by key control unit 4, state indicating member 5, data output unit 6 and storage and clock unit 7; And the signal that ultrasound parameter measuring unit 2 obtains handled; Simultaneously C8051F120 single-chip microcomputer 1 through man-machine interaction unit 8 with the data upload that records to computing machine 83, and the steering order sent of responsive computer 83.

Described ultrasound parameter measuring unit 2 is used for measuring the battery liquid velocity of sound and electrolyte temperature, comprises pulse generation unit 201, pulse excitation unit 202, ultrasound emission transducer 203, liquid container 204, electrolytic solution 205, suction pumps 206, ultrasonic receiving transducer 207, high speed A device 208, phase comparator 209 and temperature sensor 210.

Described PMU 3 is used to portable system power supply, monitoring battery dump energy and is battery charge, comprises lithium battery group 31, low electric quantity monitoring circuit 32 and charging circuit 33.Adopting the lithium battery group is system's power supply, and portable design is removed electric power connection line from, is more suitable in the operating condition of open type lead-acid accumulator working environment.

Described by key control unit 4 be used for system parameter setting with control, be connected with C8051F120 single-chip microcomputer 1 through input/output interface.State indicating member 5 is used for battery low electric weight warning indication and the indication of measurement parameter overload alarm, is connected with C8051F120 single-chip microcomputer 1 through input/output interface.Employing is by the measuring system of C8051F120 single-chip microcomputer 1 control, and automaticity is higher; By the key control simple and flexible; Through the setting to measurement parameter, system can report to the police to the data that transfinite automatically, can in time understand battery condition.

Described data output unit 6 is used for multiple mode output system measurement data; Comprise LCD display module 61, USB flash disk memory module 62 and mini-printer 63, the multiple way of output can satisfy the multiple requirements such as field notes, electronics file, printout and host computer output of measurement data.

Described storage and clock unit 7 are used for the control of saved system parameter and measurement data and system's real-time clock, comprise E 2PROM storage chip 71 and clock chip 72.

Described man-machine interaction unit 8 is used to connect the upper computer analyzing software environment, analyzes battery-operated state and performance, and can control C8051F120 single-chip microcomputer 1 and carry out operations, comprises communication interface 81, the communications cable 82 and computing machine 83.

In preferred embodiment; Described C8051F120 single-chip microcomputer 1 sends pulse and generates control signal; Gating pulse generation unit 201 produces the constant amplitude pulse ripple, and the ultrasound wave of rear drive ultrasound emission transducer 203 emission CFs amplifies in passages through which vital energy circulates impulse bill unit 202.

In preferred embodiment; Described ultrasound emission transducer 203 is that model is identical, the piezoelectric type ultrasonic transducer of parameter matching with ultrasonic receiving transducer 207; Centre frequency is 1MHz, adopts the design of dual transducers, can shorten the sound path of sound wave in tested electrolytic solution; Reduce the decay of sound wave, guarantee the accuracy of measuring.

In preferred embodiment, described ultrasound emission transducer 203 is with ultrasonic receiving transducer 207 coaxial installing and locating and be fixed on liquid container 204 both sides.

In preferred embodiment, described liquid container 204 materials are organic glass.Liquid container 204 is isolated transducer and electrolytic solution, avoids electrolytic solution and transducer enclosure generation chemical reaction and pollutes electrolytic solution, and the while organic glass has good acoustic characteristic, can guarantee effective transmission of sound wave.

In preferred embodiment, described liquid container 204 wall thickness are the 3-5 millimeter.

In preferred embodiment; Described liquid container 204 profiles are cylindrical; Last bottom surface contacts with ultrasound emission transducer 203 and ultrasonic receiving transducer 207 respectively, and cylinder bottom surface diameter equals transducer wafer diameter 3-5 doubly, equals cylinder height 3-5 doubly; Receive the influence that edge wave causes error in avoiding measuring, guarantee to measure accuracy.

In preferred embodiment, described high speed A device 208 is mould/number conversion integrated circuit of 12 bit resolutions, and switching rate need reach 40Msps, needs to satisfy the requirement of received ultrasonic signal being carried out FFT.The application of high speed A device 208 can obviously improve the measuring accuracy and the repeatability of the velocity of sound in the electrolytic solution.

In preferred embodiment, described phase comparator 209 is a kind of integrated circuit, compares to cooperate C8051F120 single-chip microcomputer 1 internal counter to carry out the accurate timing of 10ns level through the phase place to two signals.The application of phase comparator 209 can improve the measuring accuracy and the repeatability of the velocity of sound in the electrolytic solution.

Effect of the present invention and benefit be have the measuring accuracy height, major advantages such as measuring speed is fast, automaticity is high, portable design, online function.

Description of drawings

Fig. 1 is the general structure synoptic diagram of the ultrasonic picnometer of portable storage battery electrolytic solution.

Among the figure: the 1C8051F120 single-chip microcomputer; 2 ultrasound parameter measuring units; 3 PMUs; 4 by key control unit; 5 state indicating members; 6 data output units; 7 storages and clock unit; 8 man-machine interaction units.

Fig. 2 is the theory diagram of ultrasound parameter measuring unit in the ultrasonic picnometer of portable storage battery electrolytic solution.

Among the figure: the 1C8051F120 single-chip microcomputer; 2 ultrasound parameter measuring units; 201 pulse generation modules; 202 pulse excitation modules; 203 ultrasound emission transducers; 204 liquid containers; 205 electrolytic solution; 206 suction pumps; 207 ultrasonic receiving transducers; 208 high speed A devices; 209 phase comparators; 210 temperature sensors.

Fig. 3 is PMU in the ultrasonic picnometer of portable storage battery electrolytic solution, by the structural representation of key control unit and state indicating member.

Among the figure: the 1C8051F120 single-chip microcomputer; 3 PMUs; 4 by key control unit; 5 state indicating members; 31 lithium battery groups; 32 low-voltage observation circuits; 33 charging circuits; 51 low electric weight indications; The indication of transfiniting of 52 parameters.

Fig. 4 is the structural representation of data output unit and storage and clock unit in the ultrasonic picnometer of portable storage battery electrolytic solution.

Among the figure: the 1C8051F120 single-chip microcomputer; 6 data output units; 7 storages and clock unit; 61LCD display module 61; 62U disk storage module; 63 mini-printers; 71E 2The PROM chip; 72 clock chips.

Fig. 5 is the structural representation of man-machine interaction unit in the ultrasonic picnometer of portable storage battery electrolytic solution.

Among the figure: the 1C8051F120 single-chip microcomputer; 8 man-machine interaction units; 81 communication interfaces; 82 communications cables; 83 computing machines.

Fig. 6 be in the ultrasonic picnometer of portable storage battery electrolytic solution electrolyte density about the marginal data of the experimental formula of the velocity of sound in the electrolytic solution and electrolyte temperature.

Fig. 7 is the workflow diagram of the ultrasonic picnometer of portable storage battery electrolytic solution.

Embodiment

Below in conjunction with embodiment and accompanying drawing the present invention is done further explanation, but embodiment of the present invention is not limited thereto.

Fig. 1 is the general structure synoptic diagram of instance of the present invention.Ultrasound parameter measuring unit 2, PMU 3, be electrically connected with C8051F120 single-chip microcomputer 1 respectively by key control unit 4, state indicating member 5, data output unit 6, storage and clock unit 7 and man-machine interaction unit 8.C8051F120 single-chip microcomputer 1 is used to control ultrasound parameter measuring unit 2, PMU 3, by key control unit 4, state indicating member 5, data output unit 6 and storage and clock unit 7; And the signal that ultrasound parameter measuring unit 2 obtains handled; Simultaneously C8051F120 single-chip microcomputer 1 through man-machine interaction unit 8 with the data upload that records to computing machine 83, and the steering order sent of responsive computer 83;

Fig. 2 is the theory diagram of ultrasound parameter measuring unit in the instance of the present invention.Ultrasound parameter measuring unit 2 is made up of pulse generation module 201, pulse excitation module 202, ultrasound emission transducer 203, liquid container 204, electrolytic solution 205, suction pumps 206, ultrasonic receiving transducer 207, high speed A device 208, phase comparator 209 and temperature sensor 210.Ultrasound parameter measuring unit 2 is used for measuring the velocity of sound of electrolytic solution 205 and the temperature of electrolytic solution 205.Liquid container 204 is cylindrical, is used for splendid attire electrolytic solution, and material is an organic glass, and wall thickness 3-5 millimeter, its bottom surface diameter equal transducer wafer diameter 3-5 doubly, equals cylinder height 3-5 doubly.Bottom surface closely is connected with ultrasonic receiving transducer 207 with ultrasound emission transducer 203 respectively on the liquid container 204.Be electrically connected each other between pulse generation module 201, pulse excitation module 202 and the ultrasound emission transducer 203.Provide pulse by C8051F120 single-chip microcomputer 1 and generate control signal, through the constant amplitude pulse ripple of pulse generation module 201 generation CFs, the passages through which vital energy circulates impulse is sent out the transmitting terminal generation ultrasound wave of module 202 enlargement range rear drive ultrasound emission transducers 203 again.Be electrically connected each other between ultrasonic receiving transducer 207, high speed A device 208 and the phase comparator 209.After high speed A device 208 is gathered conversion,, phase comparator 209 sends into C8051F120 single-chip microcomputer 1 after handling by the acoustic signals of ultrasonic receiving transducer 207 receiving ends again.The temperature signal that temperature sensor 210 is gathered is directly sent into C8051F120 single-chip microcomputer 1.

Fig. 3 is PMU in the instance of the present invention, by the structural representation of key control unit and state indicating member.PMU 3 comprises lithium battery group 31, low-voltage observation circuit 32 and charging circuit 33.The indication 52 of transfiniting of comprise state indicating member 5 low electric weight indication 51 and parameter.

Fig. 4 is the structural representation of data output unit and storage and clock unit in the instance of the present invention.Data output unit 6 comprises LCD display module 61, USB flash disk memory module 62 and mini-printer 63.Storage and clock unit 7 comprise E 2PROM chip 71 and clock chip 72.

Fig. 5 is the structural representation of man-machine interaction unit in the instance of the present invention.Man-machine interaction unit 8 comprises communication interface 81, the communications cable 82 and computing machine 83.

Fig. 6 be in the instance of the present invention electrolyte density about the marginal data of the experimental formula of the velocity of sound in the electrolytic solution and electrolyte temperature.The coordinate transverse axis is the proportion of battery liquid among the figure, scope 1.05-1.30; The coordinate longitudinal axis is the velocity of sound in the battery liquid, the m/s of unit; Among the figure each curve representation the velocity of sound is with the variation relation of electrolyte density in the electrolytic solution under the different temperatures, temperature range is 10-50 ℃.Experimental formula can obtain through the method for curve fitting.

Fig. 7 is the workflow diagram of instance of the present invention.May further comprise the steps:

(1) power on after, system initialization reads E 2Systematic parameter in the PROM chip;

(2) judge whether system is in the host computer connection status, if then only carry out the steering order that host computer sends; If not, then prompting prepares to suck electrolytic solution;

(3) manually control suction pumps and suck electrolytic solution;

(4) velocity of sound and the electrolyte temperature in the measurement electrolytic solution;

(5) rule of thumb formula obtains the proportion of electrolytic solution, and is converted to the rate of specific gravity under 25 ℃;

(6) judge whether the parameter value that records exceeds the alarming value bound of systemic presupposition, if exceed, then execution parameter overload alarm indication; If do not exceed, output data then;

(7) deposit the data that record in USB flash disk, deposit E in 2PROM, and show by LCD;

(8) electrolytic solution is return accumulator.

Claims (8)

1. ultrasonic picnometer of portable storage battery electrolytic solution; Comprise C8051F120 single-chip microcomputer (1) and the ultrasound parameter measuring unit (2) that is electrically connected with C8051F120 single-chip microcomputer (1) respectively, PMU (3), by key control unit (4), state indicating member (5), data output unit (6), storage and clock unit (7) and man-machine interaction unit (8), it is characterized in that:
A. described C8051F120 single-chip microcomputer (1) is used to control ultrasound parameter measuring unit (2), PMU (3), presses key control unit (4), state indicating member (5), data output unit (6) and storage and clock unit (7); And the signal that ultrasound parameter measuring unit (2) obtains handled; Simultaneously C8051F120 single-chip microcomputer (1) through man-machine interaction unit (8) with the data upload that records to computing machine (83), and the steering order sent of responsive computer (83);
B. described ultrasound parameter measuring unit (2) is used for measuring the battery liquid velocity of sound and electrolyte temperature, comprises pulse generation unit (201), pulse excitation unit (202), ultrasound emission transducer (203), liquid container (204), electrolytic solution (205), suction pumps (206), ultrasonic receiving transducer (207), high speed A device (208), phase comparator (209) and temperature sensor (210); C8051F120 single-chip microcomputer (1) sends pulse and generates control signal, and gating pulse generation unit (201) produces the constant amplitude pulse ripple, and the ultrasound wave of rear drive ultrasound emission transducer (203) emission CF amplifies in passages through which vital energy circulates impulse bill unit (202);
C. described PMU (3) is used to portable system power supply, monitoring battery dump energy and is battery charge, comprises lithium battery group (31), low electric quantity monitoring circuit (32) and charging circuit (33);
D. described by key control unit (4) be used for system parameter setting with control, be connected with C8051F120 single-chip microcomputer (1) through input/output interface; State indicating member (5) is used for battery low electric weight warning indication and the indication of measurement parameter overload alarm, is connected with C8051F120 single-chip microcomputer (1) through input/output interface;
E. described data output unit (6) is used for the measurement data of multiple mode output system, comprises LCD display module (61), USB flash disk memory module (62) and mini-printer (63);
F. described storage and clock unit (7) are used for the control of saved system parameter and measurement data and system's real-time clock, comprise E 2PROM storage chip (71) and clock chip (72);
G. described man-machine interaction unit (8) is used to connect the upper computer analyzing software environment, analyzes battery-operated state and performance, and control C8051F120 single-chip microcomputer (1) execution operations, comprises communication interface (81), the communications cable (82) and computing machine (83).
2. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1; It is characterized in that: described ultrasound emission transducer (203) is identical for model with ultrasonic receiving transducer (207), the piezoelectric type ultrasonic transducer of parameter matching, and centre frequency is 1MHz.
3. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1 is characterized in that: described ultrasound emission transducer (203) and the coaxial installing and locating of ultrasonic receiving transducer (207) also are fixed on liquid container (204) both sides.
4. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1 is characterized in that: described liquid container (204) material is an organic glass.
5. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1 is characterized in that: described liquid container (204) wall thickness 3-5 millimeter.
6. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1; It is characterized in that: described liquid container (204) profile is cylindrical; Last bottom surface contacts with ultrasound emission transducer (203) and ultrasonic receiving transducer (207) respectively; Cylinder bottom surface diameter equals transducer wafer diameter 3-5 doubly, equals cylinder height 3-5 doubly.
7. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1 is characterized in that: described high speed A device (208) is the mould/number conversion integrated circuit of 12 bit resolutions, and switching rate need reach 40Msps.
8. the ultrasonic picnometer of a kind of portable storage battery electrolytic solution according to claim 1; It is characterized in that: described phase comparator (209) is a kind of integrated circuit, compares to cooperate C8051F120 single-chip microcomputer (1) internal counter to carry out the timing of 10ns level through the phase place to two signals.
CN2010105020450A 2010-09-30 2010-09-30 Portable storage battery electrolyte ultrasonic areometer CN102012351B (en)

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Publication number Priority date Publication date Assignee Title
CN102590023A (en) * 2012-02-22 2012-07-18 肇庆理士电源技术有限公司 Device for measuring density of sulfuric acid
CN102901689B (en) * 2012-10-22 2014-07-02 中国计量学院 Seaport water density measuring instrument

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442700A (en) * 1982-03-09 1984-04-17 The United States Of America As Represented By The United States Department Of Energy Ultrasonic hydrometer
CN2372684Y (en) * 1999-01-26 2000-04-05 重庆大学 Liquid density sensor by ultrasonic wave
CN1536358A (en) * 2003-04-09 2004-10-13 株式会社新宇P&T Apparatus and method for measuring dielectric specific gravity/concentration using ultrasonic wave
CN1947005A (en) * 2004-04-09 2007-04-11 国际壳牌研究有限公司 Apparatus and methods for acoustically determining fluid properties while sampling

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56133644A (en) * 1980-03-24 1981-10-19 Toshiba Corp Ultrasonic hydrometer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442700A (en) * 1982-03-09 1984-04-17 The United States Of America As Represented By The United States Department Of Energy Ultrasonic hydrometer
CN2372684Y (en) * 1999-01-26 2000-04-05 重庆大学 Liquid density sensor by ultrasonic wave
CN1536358A (en) * 2003-04-09 2004-10-13 株式会社新宇P&T Apparatus and method for measuring dielectric specific gravity/concentration using ultrasonic wave
CN1947005A (en) * 2004-04-09 2007-04-11 国际壳牌研究有限公司 Apparatus and methods for acoustically determining fluid properties while sampling

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