JPH02120028U

JPH02120028U -

Info

Publication number: JPH02120028U
Application number: JP2894889U
Authority: JP
Priority date: 1989-03-14
Filing date: 1989-03-14
Publication date: 1990-09-27
Anticipated expiration: 2004-03-14
Also published as: JP2507655Y2

Description

[Brief explanation of drawings]

第１図は本考案の原理説明図、第２図は第１図
において体積変化機構の駆動周波数とタンク内の
収納物体積とを変化させたときの伝達関数の係数
ｋ_２の変化状態を示す特性図、第３図は本考案を
説明するための原理説明図、第４図は、第３図に
おいて体積変化機構の駆動周波数とタンク３０内
の収納物体積とを変化させたときの伝達関数の係
数ｋ_１の変化状態を示す特性図、第５図Ａは本考
案の第１実施例を示した構造説明図、第５図Ｂは
同上実施例によるシステム説明図、第５図Ｃは本
考案の第２実施例を示した構造説明図、第６図は
車両運転時のリターン燃料熱による圧力変動の周
波数スペクトル図、第７図は運転時におけるリタ
ーン燃料の熱変動による圧力変動と、液体揺動と
タンク壁面の振動とによる圧力変動の周波数スペ
クトル図、第８図は第５図による実施例の体積測
定値、第９図乃至第１３図は従来例の説明図であ
る。３０……メインタンク、３１……補正用タンク
、３２……連結パイプ、３３……スピーカ（体積
変化機構）、３４ａ……第２のマイクロホン、３
４ｂ……第１のマイクロホン、３５……通気孔、
３６，３７ａ，３７ｂ……バンドパスフイルタ、
３８，３９……振幅検出器、４０……割算器、４
１……引算器、４２……増幅器、４３……微分回
路、４４……増幅器、４５……ローパスフイタ、
４６……増幅器、４７……パイプ、４７ａ……オ
リフイス、４８……防波板、４９……開口部、５
０……ケース、５１……連結パイプ、５２……金
網、５３……コーン、５４……ボール弁。 Fig. 1 is an explanatory diagram of the principle of the present invention, and Fig. 2 shows how the coefficient k2 of the transfer function changes when the driving frequency of the volume change mechanism and the volume of the contents in the tank are changed in Fig. ₁ . A characteristic diagram, FIG. 3 is a principle explanatory diagram for explaining the present invention, and FIG. 4 is a transfer function when the driving frequency of the volume change mechanism and the volume of the contents in the tank 30 are changed in FIG. 3. FIG. _5A is a structural diagram showing the first embodiment of the present invention, FIG. 5B is a system diagram according to the same embodiment, and FIG. A structural explanatory diagram showing the second embodiment of the invention, Fig. 6 is a frequency spectrum diagram of pressure fluctuations due to return fuel heat during vehicle operation, and Fig. 7 is a frequency spectrum diagram of pressure fluctuations due to return fuel heat fluctuations during vehicle operation and liquid A frequency spectrum diagram of pressure fluctuation due to rocking and vibration of the tank wall surface, FIG. 8 is a volume measurement value of the embodiment shown in FIG. 5, and FIGS. 9 to 13 are explanatory diagrams of the conventional example. 30... Main tank, 31... Correction tank, 32... Connecting pipe, 33... Speaker (volume change mechanism), 34a... Second microphone, 3
4b...first microphone, 35...ventilation hole,
36, 37a, 37b...Band pass filter,
38, 39...amplitude detector, 40...divider, 4
1...Subtractor, 42...Amplifier, 43...Differential circuit, 44...Amplifier, 45...Low pass filter,
46... Amplifier, 47... Pipe, 47a... Orifice, 48... Wavebreak plate, 49... Opening, 5
0... Case, 51... Connecting pipe, 52... Wire mesh, 53... Cone, 54... Ball valve.

Claims

[Scope of utility model registration request]

A case 50 having an opening 49 formed at one end and housed in the main tank 30;
The cavity inside the case is divided into a cavity having the opening and a cavity having no opening, and the cavity having no opening is used as a correction tank 3.
1, the volume changing means 33, and the volume changing means 3.
3 and an opening 49 formed in the case, the opening 4 is
a communication means 51 for making the static and dynamic pressure of the cavity in the case on the side communicating with the main tank 30 coincide with the pressure in the cavity in the main tank 30; a second microphone 34a that has lower sensitivity than the first microphone and detects pressure fluctuations in the correction tank 31; and a first microphone 34a that detects the amplitude value of the detection signal of the first microphone. an amplitude detection circuit 39a and a second amplitude detection circuit 39b that detects the detection signal of the second microphone.
and a divider 40 that divides the output of the second amplitude detection circuit by the output of the first amplitude detection circuit 39b. A volume measuring device characterized by measuring the volume of a measuring object.