BRPI1102147A2 - fuel metering system using accelerometer - Google Patents
fuel metering system using accelerometer Download PDFInfo
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- BRPI1102147A2 BRPI1102147A2 BRPI1102147A BRPI1102147A2 BR PI1102147 A2 BRPI1102147 A2 BR PI1102147A2 BR PI1102147 A BRPI1102147 A BR PI1102147A BR PI1102147 A2 BRPI1102147 A2 BR PI1102147A2
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- accelerometer
- inclination
- fuel
- rod
- tank
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- Level Indicators Using A Float (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
SISTEMA DE MEDIÇçO DE COMBUSTÍVEL UTILIZANDO ACELERAMENTO. O mecanismo dotado de uma haste móvel fixada em uma base no interior do tanque de combustível e sobre esta haste fixado o dispositivo eletrônico acelerômetro cuja característica é gerar uma tensão na saída proporcional a sua inclinação. Na extremidade da haste tem uma bóia que é flutuante sobre o líquido combustível contido no tanque é proporcional a inclinação angular da haste (figura 2), então para se saber o volume do combsutível é necessário saber em que posição angular está a haste e para isto o dispositivo acelerômetro é então afixado ao eixo (5) de giro da bóia (figura 3) e o deslocamento angular do eixo da bóia é determinado pela sua inclinação através da decomposição das leituras de tensões nos eixos da coordenada X do dispositivo. É possível determinar o ângulo de inclinação apenas com a variável de leitura de tensão de um dispositivo mono polar. As vantagens deste sistema de medição utilizando o aclerômetro é principalmente a precisão da leitura, seguido da pluralidade uma vez que o mesmo não querer atrito físico e por fim o custo uma vez que os dispositivos eletrônicos semiondutores estão reduzindo o preço no mercado.FUEL MEASUREMENT SYSTEM USING ACCELERATION. The mechanism provided with a movable rod fixed to a base inside the fuel tank and on this rod fixed the electronic accelerometer device whose characteristic is to generate an output voltage proportional to its inclination. At the end of the rod is a float that is floating on the fuel liquid contained in the tank is proportional to the angular inclination of the rod (figure 2), so to know the volume of the fuel it is necessary to know in which angular position is the rod and for this the accelerometer device is then affixed to the float axis (5) (figure 3) and the angular displacement of the float axis is determined by its inclination by decomposing the stress readings on the device coordinate X axes. You can determine the tilt angle only with the voltage reading variable of a mono polar device. The advantages of this measurement system using the accelerometer is mainly the reading accuracy, followed by the plurality since it does not want physical friction and finally the cost since the semionductor electronic devices are reducing the price in the market.
Description
Sistema de medigao de combustivel utilizando acelerometro Campo da InvengaoFuel metering system using accelerometer Invengao Field
O presente invento se refere a um circuito eletronico que faz uso do dispositivo eletronico acelerometro para fazer a medigao do nivel de combustivel contido dentro do tanque de um determinado veiculo automotor a combustao substituindo os atuais resistores variaveis.The present invention relates to an electronic circuit that makes use of the accelerometer electronic device to measure the level of fuel contained within the tank of a particular combustion motor vehicle by replacing current variable resistors.
As vantagens deste sistema de medigao utilizando ο acelerometro e principalmente a precisao da Ieitura1 seguido da durabilidade uma vez que ο mesmo nao requer atrito fisico e por fim ο custo uma vez que os dispositivos eletronicos semicondutores estao reduzindo ο prego no mercado.The advantages of this metering system using the accelerometer is mainly the accuracy of reading1 followed by durability since it does not require physical friction and ultimately the cost since semiconductor electronic devices are reducing the price on the market.
Estado da TecnicaState of the art
Em pesquisa na base de patentes tomamos conhecimento dos seguintes pedidos:EP0581633, EP1205738,JP9144592, JP60170724, JP2000088625, JP2000111384, JP2004286557, JP20044316491 ,JP2004317254.JP2007278108, KR20010016986,KR20010038911, KR20020000739, PCTU50111981, PI0010957, PI0704140, RU2301406 e US7448260, no entanto todos se referenciam a metodos de aquisigao e apresenta^ao de medigao, este invento se referenda a tecnica de aquisigao e medigao de nivel de combustivel em tanque de veiculo automotive).In searching the patent database, we are aware of the following applications: EP0581633, EP1205738 , JP9144592, JP60170724, JP2000088625, JP2000111384, JP2004286557, JP2004417254.JP2007278108 , KR20010016986 , K00140406, 00120406 all refer to methods of acquisition and presentation of medication, this invention refers to the technique of acquisition and measurement of fuel level in automotive vehicle tank).
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Descrigao detalhada do inventoDetailed Description of the Invention
A presente invengao tern como finalidade medir ο nivel de combustivel dentro do tanque do veiculo automotor medindo a inclinagao da haste presa em um ponto fixo movel por uma das suas extremidades e a outra com uma boia que flutua sobre ο combustivel e se baseia em um dispositivo eletronico capaz de produzir um nivel de tensao de saida proporcional a sua inclinagao referente ao piano terra, este dispositivo e preso na haste conforme visto na figura 1. Uma premissa que se deve Ievar em consideragao e referente a inclinagao emThe present invention is intended to measure the fuel level within the self-propelled vehicle tank by measuring the inclination of the rod held at a fixed point movable at one end thereof and the other with a float floating on the fuel and based on a device. An electronic device capable of producing an output voltage level commensurate with its inclination relative to the ground piano, this device is attached to the rod as seen in Figure 1. A premise to be taken into account is the inclination towards
que ο veiculo se encontra em relagao ao piano terra, esta inclinagao naothat the vehicle is in relation to the piano earth, this inclination does not
permite que a Ieitura da inclinagao da haste seja valor absoluto mas relativo ao piano. Para .anular este valor e necessario conhecer esta inclinagao e para isto deve ser conhecida a inclinagao do veiculo para corregao da leitura.allows the reading of the stem inclination to be absolute but relative to the piano. To override this value it is necessary to know this inclination and for this the inclination of the vehicle for reading correction must be known.
O circuito completo e composto de duas montagens distintas em PCI e cada um deles com um acelerometro. O primeiro circuito deve ser montado em uma placa de circuito impresso (8) fixada na haste (4) que tern a finalidade de medir a inclinagao da mesma que e proporcional ao nivel do combustivel e ο outro acelerometro deve ser montado em um ponto do veiculo fora do tanque para gararitir a medida da inclinagao do veiculo juntamente com dispositivo microprocessador que faz a gerencia do sistema, fazendo leitura da inclinagao do veiculo, da inclinagao da haste e enviando resultado em tensao proporcional ao volume instantaneo do Iiquido contido no tanque para ο quadro.de instrumentos.The complete circuit consists of two distinct PCI assemblies and each with an accelerometer. The first circuit shall be mounted on a printed circuit board (8) fixed to the rod (4) for the purpose of measuring its inclination which is proportional to the fuel level and the other accelerometer shall be mounted at a point on the vehicle. outside the tank to secure the vehicle tilt measurement along with a microprocessor device that manages the system by reading the vehicle tilt, rod tilt and sending voltage results proportional to the instantaneous volume of liquid contained in the tank to the frame .in instruments.
Nas figuras 1 e 2 podemos ver duas situagdes distintas, na figura 1 e apresentando ο tanque f1-)-no-veiouIo=Sem^inoIinagaG e neste caso a. inclinagao da boia (3) e proporcional a inclinagao da haste (4) referente ao eixo de movimento (5). Na figura 2 pode ser visto ο mesmo tanque, porem com ο veiculo em oirrpianicriridfiractorTT®ste_casera"iiiti『iriagiSo percebida da haste deve tambem ser Ievada em consideragao no calculo do volume do liquido.In figures 1 and 2 we can see two distinct situations, in figure 1 and showing the tank f1 -) - in the vein = Seminating and in this case a. tilt of the float (3) is proportional to the tilt of the rod (4) relative to the axis of motion (5). In Figure 2 can be seen the same tank, but with the vehicle in the irpianicriridfiractorTT®ste_casera "iiiti『 perceived perception of the rod should also be taken into account in calculating the volume of the liquid.
O circuito eletronico e composto de dois componentes acelerometros (7) (12) Iigados a um dispositivo microprocessador (11) que faz a gerencia do sistema, fazendo leitura da inclinagao do veiculo, da inclinagao da haste(4) e enviando resultado em tensao proporcional ao volume do liquido contido no tanque (1) para ο quadro de instrumentos.The electronic circuit is composed of two accelerometer components (7) (12) connected to a microprocessor device (11) that manages the system, reading the vehicle inclination, the rod inclination (4) and sending results in proportional voltage. the volume of liquid contained in the tank (1) for the instrument panel.
Um dos acelerometros (7) deve ser montado em uma placa de circuito impresso (8) fixada na haste (4) e ο outro deve ser montado em um ponto fixo do veiculo para garantir a medida da inclinagao do veiculo. Funcionamento do inventoOne of the accelerometers (7) must be mounted on a printed circuit board (8) fixed to the rod (4) and the other must be mounted at a fixed point of the vehicle to ensure the inclination of the vehicle is measured. Operation of the invention
A haste (4) e um componente m0ve丨 girat0rio em torno do ponto de fixagao (5) e ο seu movimento e capaz de girar em um angulo maximo de 120 graus. Este movimento quando a haste (4) esta no interior do tanque (1) e causado pela variagao do nivel de combustivel que exerce uma forga de empuxo sobre a boia (3) que esta fixada na extremidade da haste (4). Este principio de io funcionamento e ο convencional atualmente utilizado para a medigao de nivel de combustivel, para aplicagao neste invento a medida da inclinagao e feita atraves do dispositivo acelerometro.The rod (4) is a movable component that is rotatable around the attachment point (5) and its movement is capable of rotating at a maximum angle of 120 degrees. This movement when the rod (4) is inside the tank (1) is caused by varying fuel level exerting a buoyant force on the float (3) that is attached to the end of the rod (4). This principle of operation is the conventional one currently used for fuel level measurement, for application in this invention the inclination measurement is made by the accelerometer device.
Um acelerometro (7) usa a forga da gravidade como um vetor de entrada paraAn accelerometer (7) uses the force of gravity as an input vector for
determinar a orientagao de um objeto no espago. O acelerometro (7) e .maisdetermine the orientation of an object in space. The accelerometer (7) and .more
• ·‘ .....-‘. sensivel a inclinar quando ο seu eixo sensivel e perpendicular a forga da• · ‘.....-‘. sensitive to tilt when its sensitive axis is perpendicular to the force of the
gravidade, ou seja, paralelo a superficie da Terra. Nessa orientagao, a suagravity, ie parallel to the Earth's surface. In this orientation, its
sensibilidade as mudangas na inclinagao e mais elevada. Quando οsensitivity to changes in inclination is higher. When ο
acelerometro (7) esta orientado no eixo da gravidade, ou seja, perto de +/- 1g,accelerometer (7) is oriented on the gravity axis, ie close to +/- 1g,
a mudanga na aceIeragao de saida por grau de inclinagao e insignificante.The change in exit acceptance by degree of inclination is negligible.
Quando ο acelerometro (7) e perpendicular a gravidade, a sua saida mudaraWhen the accelerometer (7) is perpendicular to gravity, its output will change
cerca de 17,5 mg por cada grau de inclinagao. Em 45 ° a sua saida mudaraabout 17.5 mg for each degree of inclination. At 45 ° your exit had changed
cerca 一 d&4.2,.2—mg-.por.g.rau_d.e..i.nc.lina5ao._. A reIagao matematica abaixo demonstra a relagao entre as variaveis que compdem ο sistema:about d & 4.2, .2-mg-por.g.rau_d.e..i.nc.lina5ao._. The mathematical representation below demonstrates the relationship between the variables that compose the system:
Vout = Voffset + ( Δν / Ag χ 1.0 g X sin θ ) Onde:Vout = Voffset + (Δν / Ag χ 1.0 g X sin θ) Where:
Vout e a tensao Iida nos terminals do acelerometro;Vout is the voltage read at the accelerometer terminals;
Voffset e a tensao Iida nos terminals do acelerometro quando em O g (fornecido pelo fabricante);Voffset is the voltage read at the accelerometer terminals when at 0 g (provided by the manufacturer);
io AV / Ag έ a sensibilidade do dispositive* (fornecido pelo fabricante) 1 g e a gravidade da terra.io AV / Ag ive the sensitivity of the device * (provided by the manufacturer) 1 g and the gravity of the earth.
Onde pode se concluir que θ = arc sin (( Vout — Voffset) / (AV / Ag)) ·Where can it be concluded that θ = arc sin ((Vout - Voffset) / (AV / Ag)) ·
Para esta aplicagao, como ο volume de combustivel contido no tanque (1) e proporcional ajnclinagao da boia (3) e a tensao gerada pelo acelerometro (7) e proporcional a sua inclinagao, entao se pode concluir que a relagao entre ο volume e a tensao eletrica na saida do acelerometro (7) e diretamente pnoporcional·For this application, as the volume of fuel contained in the tank (1) is proportional to the inclination of the float (3) and the voltage generated by the accelerometer (7) is proportional to its inclination, then it can be concluded that the relationship between the volume and the voltage at the accelerometer output (7) and directly post-proportional ·
No entanto ο tanque (1) utilizado para armazenamento do combustivel nao tern —um formato homogeneo, a variagao do nivel em relagao ao volume de combustivel nao ocorre de forma linear, ou seja, ao adicionar um Iitro de combustivel obtem-se uma determinada variagao da inclinagao da boia (3). Ao adicionar novamente mais um Iitro de combustivel nao se obtem necessariamente a mesma variagao. Esse fato ocorre devido ao formato nao linear da estrutura interna do tanque (1). A nao Iinearidade do formato do tanque (1) faz com que a implementagao do invento dependa de ensaios e medig5es para obter uma relagao empirica entre a inclinagao e ο volume, construindo uma tabela como referenda. Baseado nesta informagao deve-se entao fazer um mapeamento do tanque (1) inserindo ο Iiquido em quantidades de volume constante e conhecidas e medindo a tensao de saida referente a inclinagao. Estes valores de medida constituem uma tabela de referencia armazenada em memoria eletronica do microprocessador e serve de referencia quando a informagao for requisitada durante ο funcionamento.However, the tank (1) used for fuel storage does not have a homogeneous shape, the variation of the level in relation to the fuel volume does not occur linearly, ie, by adding a fuel tank, a certain variation is obtained. tilt of the float (3). Adding one more fuel tank does not necessarily give you the same variation. This is due to the nonlinear shape of the tank's internal structure (1). The non-linearity of the tank shape (1) causes the implementation of the invention to depend on tests and measures to obtain an empirical relationship between tilt and volume, constructing a table as a reference. Based on this information one must then map the tank (1) by inserting the liquid in known constant volume quantities and measuring the inclination output voltage. These measurement values constitute a reference table stored in the microprocessor electronic memory and serve as a reference when information is requested during operation.
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Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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BRPI1102147 BRPI1102147A2 (en) | 2011-05-20 | 2011-05-20 | fuel metering system using accelerometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI1102147 BRPI1102147A2 (en) | 2011-05-20 | 2011-05-20 | fuel metering system using accelerometer |
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BRPI1102147A2 true BRPI1102147A2 (en) | 2013-06-25 |
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BRPI1102147 BRPI1102147A2 (en) | 2011-05-20 | 2011-05-20 | fuel metering system using accelerometer |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111912490A (en) * | 2020-07-23 | 2020-11-10 | 乐昌市恒源水电建筑工程有限公司 | Novel water conservancy monitoring facilities |
-
2011
- 2011-05-20 BR BRPI1102147 patent/BRPI1102147A2/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111912490A (en) * | 2020-07-23 | 2020-11-10 | 乐昌市恒源水电建筑工程有限公司 | Novel water conservancy monitoring facilities |
CN111912490B (en) * | 2020-07-23 | 2022-07-29 | 乐昌市恒源水电建筑工程有限公司 | Novel water conservancy monitoring facilities |
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B03A | Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette] | ||
B08F | Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette] |
Free format text: REFERENTE A 4A ANUIDADE. |
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B08G | Application fees: restoration [chapter 8.7 patent gazette] | ||
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B25D | Requested change of name of applicant approved |
Owner name: FIAT AUTOMOVEIS LTDA. (BR/MG) |
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B25D | Requested change of name of applicant approved |
Owner name: FCA FIAT CHRYSLER AUTOMOVEIS BRASIL LTDA (BR/MG) |
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B08F | Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette] | ||
B08K | Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette] |