Fuel residual quantity detection device and manufacturing method of fuel supply module
阅读说明:本技术 燃料剩余量检测装置及燃料供给模块的制造方法 (Fuel residual quantity detection device and manufacturing method of fuel supply module ) 是由 真锅祐一 铃木信男 于 2018-03-28 设计创作,主要内容包括:提高燃料剩余量检测装置的检测精度。燃料剩余量检测装置具有:主体;臂,其以能够相对于主体旋转的方式支承于主体;浮子,其连接于臂;角度传感器,其根据主体与臂的相对角度来输出第一数据;存储电路,其存储有转换数据,在该转换数据中与所述第一数据的值相对应地描述了第二数据的值;以及数据转换电路,其从角度传感器接收第一数据,并基于转换数据来将接收到的第一数据转换为第二数据。燃料剩余量检测装置的制造方法包括转换数据生成工序,在该转换数据生成工序中,进行在将所述相对角度设置为规定角度的状态下测定角度传感器输出的第一数据的值、并将与所述规定角度对应的值作为第二数据的值来与测定出的第一数据的值相应地存储到存储电路的处理,针对至少3个所述规定角度实施上述的处理来生成转换数据。(The detection accuracy of the fuel remaining amount detection device is improved. The fuel remaining amount detection device includes: a main body; an arm supported by the main body so as to be rotatable with respect to the main body; a float connected to the arm; an angle sensor that outputs first data according to a relative angle of the body and the arm; a storage circuit that stores conversion data in which a value of second data is described in correspondence with a value of the first data; and a data conversion circuit that receives the first data from the angle sensor and converts the received first data into second data based on the conversion data. The method for manufacturing the fuel residual quantity detection device includes a conversion data generation step of performing a process of measuring a value of first data output from the angle sensor in a state where the relative angle is set to a predetermined angle, storing a value corresponding to the predetermined angle as a value of second data in the storage circuit in accordance with the measured value of the first data, and performing the above-described process for at least 3 predetermined angles to generate conversion data.)
1. A method of manufacturing a fuel remaining amount detecting device for detecting a remaining amount of fuel in a fuel tank,
the fuel remaining amount detection device includes:
a main body;
an arm supported by the main body so as to be rotatable with respect to the main body;
a float connected to the arm;
an angle sensor that outputs first data according to a relative angle of the body and the arm;
a storage circuit that stores conversion data in which a value of second data is described in correspondence with a value of the first data; and
a data conversion circuit that receives the first data from the angle sensor, converts the received first data into the second data based on the conversion data, and outputs the converted second data,
wherein the manufacturing method comprises a conversion data generation step of generating conversion data,
the conversion data is generated by performing a process of measuring a value of the first data output from the angle sensor in a state where the relative angle is set to a predetermined angle, storing a value corresponding to the predetermined angle as a value of the second data in the storage circuit in association with the measured value of the first data, and performing the above-described process for at least 3 predetermined angles.
2. A manufacturing method of a fuel supply module having a fuel supply device for supplying fuel in the fuel tank to the outside and the fuel remaining amount detecting device according to claim 1, the main body of the fuel remaining amount detecting device being fixed to the fuel supply device, wherein,
the conversion data generating step is performed in a state where the main body is fixed to the fuel supply device,
in the converted data generating step, a process of measuring a value of the first data output from the angle sensor in a state where the float is set at a predetermined height, and storing a value proportional to the predetermined height as a value of the second data in the storage circuit in association with the measured value of the first data is performed, and the above-described process is performed for at least 3 predetermined heights.
Technical Field
The technology disclosed in the present specification relates to a fuel remaining amount detection device and a method for manufacturing a fuel supply module.
Background
Japanese patent laid-open No. 2005-274434 discloses a fuel remaining amount detecting device for detecting a remaining amount of fuel in a fuel tank. The fuel remaining amount detection device includes a main body, an arm supported by the main body so as to be rotatable with respect to the main body, and a float connected to the arm. The float floats on the fuel in the fuel tank. When the level of fuel in the fuel tank changes, the position of the float in the up-down direction changes, so that the arm rotates relative to the main body. An angle sensor (hall IC) is provided inside the main body. The angle sensor outputs data indicative of the relative angle of the body and the arm. Thus, the remaining amount of fuel in the fuel tank can be calculated based on the data output by the angle sensor.
Disclosure of Invention
Problems to be solved by the invention
Sometimes, a detection error occurs in the angle sensor. For example, when a deviation occurs between the rotation center axis of the arm and the axis of the angle sensor due to a manufacturing error or the like, a deviation may occur between data (data indicating the angle of the arm) output by the angle sensor and the actual angle of the arm. FIG. 5 illustrates data θ output by the angle sensor1Angle theta to the actual arm0The relationship between them. The solid line curve of fig. 5 represents the values on design, and the broken line curve of fig. 5 represents the values of a specific individual of the angle sensor. The difference between the solid line curve and the dashed line curve is the detection error. As shown in FIG. 5, the magnitude of the detection error depends on the angle θ of the arm0But may vary. In addition, namelyThe detection error of the angle sensor is different for each individual fuel remaining amount detection device of the same type. Conventionally, such a detection error cannot be corrected, and the detection accuracy of the remaining fuel amount is not so high. In the present specification, a technique capable of improving the detection accuracy of the remaining fuel amount detection device is provided.
Means for solving the problems
The remaining fuel amount detection device for detecting the remaining amount of fuel in the fuel tank is manufactured by the manufacturing method disclosed in the present specification. The fuel remaining amount detection device manufactured by the manufacturing method includes: a main body; an arm supported by the main body so as to be rotatable with respect to the main body; a float connected to the arm; an angle sensor that outputs first data according to a relative angle of the body and the arm; a storage circuit that stores conversion data in which a value of second data is described in correspondence with a value of the first data; and a data conversion circuit that receives the first data from the angle sensor, converts the received first data into the second data based on the conversion data, and outputs the converted second data. The manufacturing method includes a conversion data generating step of performing a process of measuring a value of the first data output from the angle sensor in a state where the relative angle is set to a predetermined angle, storing a value corresponding to the predetermined angle in the storage circuit as a value of the second data in association with the measured value of the first data, and performing the above-described process for at least 3 predetermined angles to generate the conversion data.
The second data may be data relating to the relative angle between the body and the arm, or other data (for example, data relating to the level of fuel) calculated from the relative angle between the body and the arm.
In this manufacturing method, the value of the first data output by the angle sensor is measured in a state where the relative angle between the body and the arm is set to a predetermined angle. Thereby, an error (i.e., a detection error) between the actual relative angle between the main body and the arm and the first data output by the angle sensor is known. Here, a value corresponding to the set predetermined angle is stored in the storage circuit as a value of the second data in correspondence with a measured value of the first data. For example, when the first data output from the angle sensor shows 10.5 degrees in a state where the relative angle between the main body and the arm is set to 10.0 degrees, which is the actual relative angle (or another value (for example, the liquid level of fuel) calculated based on 10.0 degrees) is stored in the storage circuit as the value of the second data corresponding to the first data of 10.5 degrees. Therefore, in the case where the first data output from the angle sensor shows 10.5 degrees when the fuel remaining amount detection device is used later, the second data output from the data conversion circuit shows 10.0 degrees (or other value calculated based on 10.0 degrees). The value based on the actual relative angle is output as the second data, and therefore the remaining amount of fuel can be detected more accurately. In this manufacturing method, processing of storing the second data in correspondence with the measured value of the first data is performed for at least 3 predetermined angles. Therefore, even when the magnitude of the detection error of the angle sensor changes according to the relative angle as shown in fig. 5, the conversion data can be generated so as to correct the detection error. Therefore, according to this manufacturing method, it is possible to manufacture a fuel remaining amount detection device capable of accurately detecting the remaining amount of fuel even when the magnitude of the detection error of the angle sensor changes according to the relative angle. Further, according to this manufacturing method, since the conversion data is generated in accordance with the detection error generated by the remaining fuel amount detection device in the manufacturing process, the detection error can be corrected appropriately for each individual remaining fuel amount detection device. Thus, variations in the individual detection accuracy of each of the remaining fuel amount detection devices can be suppressed.
The examples described below have the following feature 1. The feature 1 is an independent technical element, and exhibits technical usefulness alone or in various combinations.
In the (feature 1), the conversion data generation step disclosed in the present specification may be performed when manufacturing a fuel supply module including a fuel supply device for supplying fuel in a fuel tank to the outside and a fuel remaining amount detection device having a main body fixed to the fuel supply device. In this case, the conversion data generation step may be performed in a state where the main body of the remaining fuel amount detection device is fixed to the fuel supply device. In the converted data generating step, a process of measuring a value of first data output from the angle sensor in a state where the float is set at the predetermined height, and storing a value proportional to the predetermined height as a value of second data in the storage circuit in association with the measured value of the first data may be performed, and the above-described process may be performed for at least 3 predetermined heights. When the main body of the remaining fuel amount detecting device is attached to the fuel supply device, an attachment error may occur in a position or an angle. If the conversion data generation step is performed in a state where the main body of the remaining fuel amount detection device is fixed to the fuel supply device as described above, the conversion data can be generated so as to correct the mounting error as well, and therefore the detection accuracy of the remaining fuel amount detection device can be further improved.
(feature 2) the arm may be fixed with a magnet, and the angle sensor may detect a relative angle of the arm and the body based on a change in a magnetic field generated by rotation of the magnet.
Drawings
FIG. 1 is a side view of a
Fig. 2 is a side view of the
Fig. 3 is a block diagram of the fuel remaining
Fig. 4 is a diagram showing conversion data.
FIG. 5 is a view showing the angle θ0And primary data theta1Graph of error between.
FIG. 6 is a graph showing the actual height H in the process of generating the conversion data0Primary data θ1And secondary data H1Of a relationship betweenFigure (a).
FIG. 7 is a graph showing an actual angle θ in the process of generating the conversion data0Primary data θ1And secondary data theta2A graph of the relationship between.
Detailed Description
(embodiment) a
The
The remaining fuel
Although not shown, a magnet and a magnetic sensor are disposed inside the
As shown in fig. 3, an
Then, the angle θ0And primary data theta1The error therebetween will be explained. FIG. 5 shows the angle θ0And primary data theta1The relationship between them. The broken line curve in fig. 5 represents the designed value, and the solid line curve in fig. 5 represents the measured value. As shown by the dashed line curve of fig. 5, the fuel remaining
Height H of
In addition, the primary data θ explained in fig. 51The deviation from the design value differs for each individual fuel remaining
Description can be made on the above-described primary data θ1The method of manufacturing the
The remaining fuel amount detecting means 20 (i.e., the pre-completion remaining fuel amount detecting means 20) which does not store the conversion data in the memory 34b is prepared. As shown in fig. 1 and 2, the
Initially, height H is adjusted0Set at 0.0 cm. Angle theta at this time0About-20 degrees. In addition, although the angle θ is shown in fig. 60However, the measurement of the angle θ is not required in the conversion data generation step0. When the height H is reduced0When the value is set to 0.0cm, the primary data θ outputted from the magnetic sensor 28 at that time is measured1(-22). Then, the measured primary data θ1(-22) is stored to the memory 34b and the height H is stored0(or with height H)0Proportional value) as secondary data H1(═ 0.0) to match the primary data θ1And correspondingly stored in the memory 34 b. Thereby, the primary data θ1(-22) and secondary data H1((0.0)) is correspondingly stored in the memory 34 b. Then, the
The manufacturing of the remaining fuel amount detecting device 20 (or the fuel supply module 10) is completed according to the storage of the conversion data into the memory 34 b.
As described above, the conversion data is generated in the manufacturing process, and the primary data θ is converted by the data conversion circuit 34 based on the conversion data1Conversion into secondary data H1Thereby improving the detection accuracy of the remaining amount of fuel. The details will be described below.
As illustrated in fig. 5, the primary data θ output from the magnetic sensor 281Relative to the actual angle theta0With an error. Therefore, as shown in fig. 6, in the conversion data generation step, the actual angle θ is also set0And primary data theta1An error is generated therebetween. In the change data generation step, the data is compared withActual height H0Proportional secondary data H1And primary data theta with error1And correspondingly stored in the memory 34 b. After the fuel remaining
Further, as described above, the primary data θ1And angle theta0The magnitude of the error between depends on the angle theta0But may vary. As shown in fig. 4 and 6, for at least 3 or more heights H0Storing primary data theta1And secondary data H1Thus, even when the error depends on the angle θ0Even when the variation is complicated, the error can be corrected accurately. In addition, as described above, the primary data θ1And angle theta0The error between the remaining fuel
In the above-described embodiment, the conversion data generating step is performed after the
In the above-described embodiment, the arithmetic circuit 34a outputs the height H from the
In addition, in the above-described embodiment, the level of the fuel is displayed using the
In the above-described embodiment, the fuel remaining
The embodiments of the present invention have been described in detail, but the embodiments are merely examples and do not limit the claims. The techniques described in the claims include those obtained by variously changing and modifying the specific examples illustrated above. The technical elements described in the specification and drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects has technical usefulness by itself.
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