JP2012021798A - Liquid amount display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid amount display device which pays attention to behavior of a liquid surface in a tank 1, reduces a delay of indication, and can accurately instruct a liquid amount.SOLUTION: The liquid amount display device includes a control unit 40 for outputting a display signal to a meter body 30 with a signal from a detection sensor 20. The control unit 40 outputs the display signal after a set time T according to increase/decrease of a liquid surface level, displays a current indication value fn-1 which has been decreased by the minimum unit after an increased set time T0+ α on the meter body 30, when the liquid surface is decreased at such a predetermined low liquid amount that the liquid surface level in a tank 1 is lower than a first specified level X1, and displays the current indication value fn-1 which has been increased by the set value after an increased set time T0+ β on the meter body 30, when the liquid surface is increased at such a predetermined high liquid amount that the liquid surface level in the tank 1 is equal to or higher than a second specified level X2 which is higher than the first specified level X1.

Description

  The present invention relates to a liquid amount display device that reduces errors due to liquid level fluctuations during traveling. In particular, it is used for a vehicle fuel meter and a vehicle oil meter.

  Conventionally, a vehicle liquid level indicating instrument described in Patent Document 1 is known. In this Patent Document 1, a detection means for detecting a liquid level in a fuel tank mounted on a vehicle, and a target value is obtained by averaging the liquid level detected by the detection means, and based on this target value. A computer for outputting a liquid level signal and a pointer for instructing the amount of liquid at an instruction position based on the liquid level signal.

  That is, when the target value changes, the computer outputs a liquid level signal that moves the pointer from the current designated position by the resolution, and continues outputting the liquid level signal for a set time. .

  As a result, when the liquid level in the fuel tank greatly fluctuates due to traveling conditions such as sudden acceleration / deceleration, sudden turning, etc., and the liquid level detected by the detecting means fluctuates greatly, The target value obtained by averaging the liquid level that has greatly changed this time will fluctuate more than the previous target value, so the pointer is moved from the current indicated position by the resolution (minimum amount for which the pointer can be controlled). Thus, the computer outputs the liquid level signal.

  As a result, the pointer moves by the resolution, but at this time, the computer continues to output the liquid level signal for the set time. For this reason, the pointer is prevented from moving until the set time has elapsed after moving by the resolution.

Japanese Patent No. 3036110

  As described in Patent Document 1, the fuel gauge signal in the vehicle greatly fluctuates during traveling. However, if a sender unit that detects the amount of liquid is installed at the center of the fuel tank, when the liquid level is high, if the fuel tank is tilted compared to the horizontal, a higher signal is sent to the indicating instrument. . Conversely, when the liquid level is low, if the fuel tank is tilted compared to the horizontal, a lower signal is transmitted to the indicating instrument side.

  In Patent Document 1, a liquid level signal is continuously output for a set time (holding time) without considering the above characteristics. In other words, since the indicator was driven with the same set time, there was a delay more than necessary when the liquid volume was in the middle range, and the correct liquid volume could not be indicated. . This problem is related not only to the fuel tank but also to the entire liquid amount display device using an in-tank sensor that detects a liquid level in a tank that is mounted on a vehicle and stores liquid.

  In view of the above problems, the present invention provides a liquid amount display device that can display the liquid amount more accurately by focusing on the behavior of the liquid level in the tank and minimizing the display delay. Objective.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

  In order to achieve the above object, the present invention employs the following technical means. That is, in the first aspect of the present invention, the display means for displaying the liquid level in the tank, the detection means for detecting the liquid level in the tank, and the liquid level detected by the detection means each time the liquid level is increased or decreased. The display control means updates the display value of the display means after holding the set time, and the display control means sets the set time when the liquid level detected by the detection means decreases below the first specified level. When the liquid level detected by the detecting means is increased from the second specified level by updating the display value by decreasing the display value on the display means by the minimum unit after the increased set time, the setting value is set. The time is increased, and the display value is updated by increasing the current display value on the display means by the minimum unit after the increased set time.

  According to the present invention, when the liquid level in the tank is reduced, the control means, after the set time increased, when the liquid level in the tank is lower than the first specified level. When the liquid level in the tank is higher than the second specified level when the liquid level in the tank is increased, the displayed value is decreased by the minimum unit. After the set time, the current display value can be increased by the minimum unit and displayed on the display means. Therefore, the set time is increased when the fluctuation of the liquid level due to the tilting of the tank is large, and the set time is not increased otherwise, so it takes more set time than necessary to display on the display means. Therefore, it is possible to accurately display the liquid level in the tank.

  In the invention according to claim 2, the display control means averages the liquid level detected by the detection means and generates an average value, and whether or not the average value is larger than the current display value. Determination means for determining, a comparison means for comparing the current display value with the first prescribed level and the second prescribed level, and a time setting means for setting a set time based on a comparison result of the comparison means, and The display control means compares the average value with the current display value, and when the average value is smaller than the current display value and the current display value is smaller than the first specified level, the time setting means Increase the set time by one set amount, compare the average value with the current display value, set the time when the average value is larger than the current display value and the current display value is greater than the second specified level. Means to increase the set time by the second set amount It is a symptom.

  According to the present invention, when the liquid level in the tank decreases and the current display value is smaller than the first specified level, the current display value is decreased by the minimum unit after the set time increased by the first set amount. When the liquid level in the tank increases and the current display value is greater than the second specified level, the current display value is minimized after the set time increased by the second set amount. Since the unit is incremented and displayed on the display means, the set time is increased when the liquid level fluctuation due to the tilt of the tank is large, and otherwise the set time is not increased. The liquid level in the tank can be accurately displayed without taking more time than necessary.

  The invention according to claim 3 is characterized in that the detection means is provided at a central position in the horizontal direction of the tank.

  According to the present invention, since the detecting means is provided at the center position in the horizontal direction of the tank, it is possible to reliably detect an increase or decrease in the liquid level in the tank at the center portion of the tank due to the inclination of the tank.

  According to a fourth aspect of the present invention, the tank is composed of a vehicle fuel tank, and the detecting means is composed of a fuel sensor for detecting a liquid level of the fuel in the vehicle fuel tank.

  According to the present invention, when the liquid level of the fuel in the fuel tank is tilted by traveling of the vehicle, a large set time is set even if the liquid level at the center of the tank is tilted. The value does not change frequently, and even if the fuel level in the middle part of the fuel tank is difficult to tilt even if the fuel level in the fuel tank is inclined, the set time can be reduced. The remaining amount can be displayed accurately.

  In the invention described in claim 5, the display means includes a pointer driving device controlled by the display control means, and is driven by the pointer driving device after a set time by at least the resolution of the pointer driving device in which the pointer is a minimum unit. The display value is displayed by designating the display position on the display board by the pointer.

  According to the present invention, since the pointer driven by the pointer driving device is driven after an appropriate set time, a more accurate liquid level can be indicated.

1 is an overall system diagram of a vehicle fuel indicating device according to an embodiment of the present invention. It is explanatory drawing explaining the state in which the liquid level changes when the tank of the said vehicle fuel indicator in the said embodiment inclines with respect to the horizontal. It is a characteristic view which shows the change of the output value of the sensor in a tank when the said tank inclines in the said embodiment. It is a flowchart of the typical process within the control apparatus of the fuel instruction | indication apparatus for vehicles in the said embodiment.

(One embodiment)
FIG. 1 is an overall system diagram of a vehicular fuel meter as an embodiment of the liquid level display device of the present invention. FIG. 2 is an explanatory diagram illustrating a state in which the liquid level changes when the tank is tilted with respect to the horizontal. FIG. 3 is a characteristic diagram showing an example of a change in the output value of the in-tank sensor when the tank is tilted.

  In FIG. 1, reference numeral 1 denotes a fuel tank that is a tank, 10 is a fuel level, 20 is a fuel sensor (also referred to as a tank sensor) that forms detection means, and a horizontal central position Pc ( 2) A fuel sender whose resistance value changes according to a float (not shown) that is installed in the vicinity and moves according to the fuel level.

  The fuel sensor 20 constituting the detecting means is provided at a substantially central position in the tank 1 where the increase or decrease of the liquid level at the tank 1 central position Pc accompanying the inclination of the tank 1 can be detected. The fuel sensor 20 converts a change in electric resistance value into a voltage value, and outputs it as a detection signal corresponding to the remaining amount of fuel to the control device 40 constituting the control means.

  Reference numeral 30 in FIG. 1 denotes a meter main body that forms display means, and includes a control device 40 and a step motor 50 that forms a pointer driving device that actually drives the pointer 60. In addition, the control apparatus 40 may be provided in the position away from the meter main body 30 which comprises a display means. A microcomputer (not shown) in the control device 40 includes a CPU that executes arithmetic processing based on the detection signal.

  Further, the control device 40 is composed of a RAM that can be read and rewritten for temporarily storing calculation processing results in the CPU, and a ROM that stores control programs and control data necessary for the operation of the step motor 50 and the like. And an input / output interface connected to the bus for exchanging detection signals, control signals, clock signals, and the like.

  The input / output interface has an A / D conversion circuit that converts an analog signal into a digital signal. The A / D conversion circuit is a circuit that converts a voltage value (analog value) relating to the liquid level sent from the fuel sensor 20 into a digital value.

  In this case, the control device 40 has a drive driver for driving the step motor 50. The meter body 30 serving as a display means is provided with a pointer 60 that is supported by the rotation shaft of the step motor 50 and points on the display plate 30a.

  The pointer 60 that rotates on the display plate 30a reaches a predetermined indication angle range (that is, an F point position indicating that the fuel is sufficiently filled, and an E point position indicating that the remaining amount of fuel is very small). Range).

  A step motor constituting a pointer driving device having a rotary shaft connected to the pointer 60 so as to pass through a through-hole formed in the display plate 30a rotates the pointer 60 to form an analog fuel gauge that forms a display means. Consists of one part.

  FIG. 2A for explaining a state in which the liquid level changes when the tank 1 is tilted with respect to the horizontal shows a change in the liquid level when the liquid amount is large. In this way, when the liquid amount is a predetermined high liquid amount, the level of the liquid in the tank 1 when horizontal is at the position 2a.

  From this state, when the right side of the tank 1 is lifted, the liquid level in the tank 1 is lowered on the right side to be in the state 2b. On the other hand, when the left side of the tank 1 is lifted from the state where the liquid level is 2a, the left side of the liquid level in the tank 1 is lowered and the liquid level is as in 2c.

  That is, even if the internal liquid level volume of the tank 1 is constant (unchangeable) and the fuel sensor 20 (FIG. 1) is installed at the center Pc in the tank 1, when the tank 1 is tilted, As in a), the fuel sensor 20 outputs a detection signal increased by Δ (delta) to the control device 40 (FIG. 1). The magnitude of Δ is determined by the geometric shape of the tank 1, the amount of liquid, and the tilt angle.

  Reference numeral 3a in FIG. 2 (b) denotes a liquid level in a horizontal state when the liquid amount is in an intermediate region. 3b shows a liquid level state in which the right side of the tank 1 is lifted and the right side of the liquid level in the tank 1 is lowered with the same liquid amount (that is, the liquid amount is an intermediate region).

  On the other hand, when the left side of the tank 1 is lifted from the state where the liquid level is 3a, the left side of the liquid level in the tank 1 is lowered and the liquid level is 3c. Thus, in the state where the liquid amount is in the intermediate range, if the shape of the tank 1 is symmetric, no change in the liquid level at the center position such as Δ (delta) is observed.

  Reference numeral 4a in FIG. 2 (c) denotes a horizontal liquid level when the liquid volume is a predetermined low liquid volume that is even smaller than the intermediate area. 4b shows the liquid level in the tank 1 when the right side of the tank 1 is lifted with the same liquid volume (that is, the liquid volume is a predetermined low liquid volume). Conversely, when the left side of the tank 1 is lifted from the liquid level state 4a, the left side of the liquid level in the tank 1 is lowered to a liquid level state such as 4c.

  As shown in FIG. 2C, in the case of a predetermined low liquid volume with a small liquid volume, the fuel sensor 20 outputs a smaller detection signal to the control device 40 than in the horizontal state due to the inclination of the tank 1. The cause of the liquid level fluctuation in the vicinity of the center of the tank 1 when the liquid level in the tank 1 is a predetermined high liquid amount or a predetermined low liquid amount is that both ends P1, P2, P3, P4 of the liquid surface are This is because the tank 1 covers not the side surfaces 1X1 and 1X2 but the upper surface 1Y1 or the bottom surface 1Y2.

  Accordingly, a graph in which the horizontal axis represents the liquid level (liquid level) in the tank 1 and the vertical axis represents the change in the detection signal (change in the output value of the fuel sensor 20) when the tank 1 is tilted from the horizontal state. As shown in FIG. In FIG. 3, the liquid level in the tank 1 increases as the liquid level goes to the right.

  That is, when the liquid volume is lower than the (X1) point, when the tank 1 is tilted, the change in the output value of the fuel sensor 20 in the tank 1 appears as a signal change in the negative direction. When there is no substantial change in the intermediate range and the liquid amount is a predetermined high liquid amount greater than the (X2) point, the change in the output value of the fuel sensor 20 in the tank 1 appears as a positive signal change. Since the shape of the graph of FIG. 3 changes depending on the mounting position of the fuel sensor 20, the shape of the tank 1, etc., X1 and X2 are determined as initial setting values for each vehicle type by tuning.

  Liquid level fluctuations during driving can be canceled out by mere averaging. However, tanks 1 such as mountain roads where the front side of the vehicle is facing up for a long time, or highway interchanges are used. On the other hand, when the inertial force in the lateral direction is long, the above phenomenon occurs because the liquid surface is inclined for a relatively long time.

  The detection signal of the fuel sensor 20 is analog / digital converted by an A / D conversion circuit in the control device 40 of FIG. This digitally converted detection signal is subjected to averaging to remove fluctuations due to noise and vehicle vibration, and becomes an averaged signal Fn. Averaging averages 256 values.

  Next, the current meter indication value (current indication value or current display value) fn-1 is compared with the averaged signal Fn, and if they are the same, nothing is done, and the liquid level varies. Then, the following processing is performed.

(Liquid level rise)
When the averaged signal Fn is larger than the current instruction value fn-1, that is, when the liquid level rises, the current instruction value fn-1 is smaller than the second specified level (X2 in FIG. 3). The set time T is a normal value T0.

  When the current instruction value fn-1 is larger than the second specified level (X2 in FIG. 3) and the liquid level rises in FIG. 2A, the set time is set to be greater than T0. Increase by one set amount α. That is, when the liquid level rises and the liquid level is a predetermined high liquid amount as shown in FIG. 2A, the set time is increased.

  At this time, the target value of the instruction is increased by one step. That is, control data is generated so as to display a one-step liquid level rise. In this case, control data for driving the pointer 60 in the direction of the point F in FIG. 1 by one resolution of the step motor 50 is generated. One resolution is a minimum unit (set amount) for increasing the current instruction value (current display value).

  The generated control data is output as a drive signal (display signal) from the drive driver to the step motor 50 after the increased set time (T = T0 + α) has elapsed, and is one shake that is the minimum unit for increasing the current instruction value. The pointer 60 (FIG. 1) is driven in the direction of the F point only by the corner. Accordingly, when the liquid level rises in the state of FIG. 2A and the liquid level instruction rises, an appropriate set time increased can be set for the liquid level fluctuation due to the inclination of the tank 1. Thus, the pointer 60 can indicate a more correct value.

(Lower liquid level)
When the averaged signal Fn is smaller than the current instruction value fn−1, that is, when the liquid level is lowered, when the current instruction value fn−1 is larger than the first specified level (X1 in FIG. 3), The set time T is a normal value T0.

  When the current indication value fn-1 is smaller than the first specified level (X1 in FIG. 3) and the liquid level is lowered in FIG. 2C, the set time is set to be less than T0. Increase by the second set amount β. That is, when the liquid level is lowered and the liquid level is a predetermined low liquid amount as shown in FIG. 2C, the set time is increased by β.

  At this time, the target value of the instruction is lowered by one step. In this case, control data for driving the pointer 60 in the direction of the point E in FIG. 1 is generated by one resolution of the step motor 50. One resolution is a minimum unit (set amount) for decreasing the current indicated value.

  The generated control data is output as a drive signal from the drive driver to the step motor 50 after the increased set time (T = T0 + β), and drives the pointer in the direction of the E point by one deflection angle. Accordingly, when the liquid level is lowered in the state of FIG. 2C and the liquid level instruction is lowered, the set time is increased, so that the pointer 60 can designate a more correct value.

  FIG. 4 is a flowchart of representative processing in the control device 40 of FIG. In the following, the above-described processing will be described based on the flowchart of FIG. In FIG. 4, when the control is started, the initial set values such as the prescribed levels X1, X2 are read and the timing number n is reset to 0. Then, in step S1, the digitally converted sensor signal forms a signal generating unit. In S2, fluctuations due to electrical noise and vehicle vibration are removed by averaging the sensor signals, resulting in an averaged signal Fn. In this averaging process, the past 256 sensor signals are averaged.

  Next, in step S3, the current meter instruction value (current instruction value) fn-1 is compared with the averaged signal Fn, and if they are the same (YES), nothing is done. If so, do the following:

  In step S4, which constitutes a means for determining whether the averaged signal Fn is greater than the current instruction value fn-1, if the averaged signal Fn is greater than the current instruction value fn-1, it is determined YES. Then, the process proceeds to step S5. If the current instruction value fn-1 is smaller than the specified level X2 in step S5, NO is determined, and the set time T is set to the normal value T0 in step S6.

  On the other hand, if the current instruction value fn−1 is larger than the specified level X2 in step 5, it is determined YES, and in step S7, the set time T is made longer than T0 by α. After step S6 and step S7, in step S8, the instruction target value (control data) is increased by one step (minimum unit).

  Next, in step S9, it is determined whether the set time T has elapsed. After the set time T has elapsed, in step S10, an instruction target value (control data) is output from the control device 40 to the step motor 50 as a drive signal. The

  As a result, when the liquid level rises and the liquid level indication rises, the pointer 60 can indicate a more correct value. Next, in step S11, the timing number n of the instruction value (Fn, fn-1) is increased by one step, and the process returns to step S1.

  In step S4, NO is determined when the averaged signal Fn is smaller than the current instruction value fn−1. In step 12, NO is determined if the current instruction value fn−1 is greater than the specified level X1. In step S13, the set time T is set to the normal value T0.

  In step S12, when the current instruction value fn-1 is smaller than the specified level X1, it is determined as YES and the process proceeds to step S14. In step S14, the set time T is set longer than T0 by β. After step S13 or step S14, in step S15, the instruction target value is lowered by one step (minimum unit).

  After the set time T in step S9 has elapsed, the drive signal generated from the indicated target value in step S10 is actually output. As a result, when the liquid level is lowered and the liquid level instruction is lowered, the pointer can indicate a more correct value. Next, in step S11, the timing number n of the instruction value (Fn, fn-1) is increased by one step, and the process returns to step S1.

  Note that steps S5 and S12 constitute comparison means for comparing the current instruction value with the first specified level X1 and the second specified level X2. Steps S6, S7, S13, and S14 constitute a set time setting means.

  As described above, in the above-described embodiment, in the liquid amount indicating device in which the detection means is provided in the tank and the liquid level in the tank is displayed on the display means by the signal from the detection means, the signal from the detection means is used. And a control (calculation) means for outputting a display signal to the display means.

The control means outputs a display signal to the display means after a set (delay) time according to the increase / decrease of the liquid level, and when the liquid level in the tank decreases, the liquid level in the tank becomes a predetermined low level. In the case of liquid volume, the current indication value is decreased by a predetermined amount after the increased set (delay) time and displayed on the display means. When the liquid level in the tank increases, the liquid level in the tank is predetermined. In the case of a predetermined high liquid volume larger than the low liquid volume, the current indicating value is increased by a predetermined amount after the increased set (delay) time and displayed on the display means. According to this, the control (calculation) means When the liquid level in the tank decreases and the liquid level in the tank is a predetermined low liquid level, the current indicated value is decreased by a predetermined amount and displayed on the display means after the increased set (delay) time. And the liquid level in the tank When the liquid level in the tank is higher than the predetermined low liquid volume when the liquid level increases, the current instruction value is increased by a predetermined amount after the increased set (delay) time and displayed on the display means. Since the setting (delay) time is increased when the fluctuation of the liquid level due to the tilting of the tank is large, and the setting (delay) time is not increased otherwise, the display means displays more than necessary. Setting (delay) time is not required, and the liquid level in the tank can be displayed accurately.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows. For example, in the above-described embodiment, the fuel remaining amount detection signal from the fuel sensor 20 is directly input to the control device 40 in the meter body 30. For example, a CAN (Controller Area Network) communication cable is used. In addition, the detection signal may be input to the control device 40 via a communication device.

  Next, in the above-described embodiment, the drive driver and the step motor are operated based on the control data to display the fuel remaining amount by the pointer, but the cross coil gauge and the drive circuit therefor are used. Also good.

  This cross coil gauge crosses a coil around a permanent magnet, rotates the permanent magnet by the magnetic field, and, as a result, rotates the pointer fixed to the end of the rotating shaft fixed to the permanent magnet. .

  In this case, the pointer moves on the dial on which F (full tank) and E (empty) are displayed so as to have a set deflection angle about the rotation axis. The drive circuit for the cross coil gauge controls the energization amount of the intersecting coils based on the voltage signal, and increases or decreases the pointer for each minimum unit consisting of resolution (set angle).

  Next, in the above-described embodiment, the present invention is applied to an automobile fuel meter. However, the present invention is applied to a liquid amount indicating instrument such as engine coolant, brake fluid, various oils (engine oil, etc.), and window washer fluid. It may be applied.

  Next, in the above-described embodiment, the pointer that rotates about the rotation axis is used, but a pointer that reciprocally moves in parallel may be used. In addition, the present invention can be applied not only to analog instruments but also to digital display instruments that display on a liquid crystal display device. In this case, the control data changes the pointer image or the numeric image in the display screen in the liquid crystal display device after a set time via the liquid crystal display driver.

  In the case of using a liquid crystal display device, a segment display in which a bar-like graph is displayed by changing the height in accordance with increase or decrease in the liquid amount can be employed. In addition, when the TFT liquid crystal is used, the liquid amount can be displayed by a graphic display in which the pointer image changes.

  Next, in the above-described embodiment, the voltage signal is used as the detection signal (liquid level signal). However, an electrical signal such as a frequency signal or a current signal, or an electrical signal + fluid pressure signal may be used. In one embodiment, the pointer is moved by one deflection angle (one minimum resolution) as the minimum unit (set), but a plurality of deflection angles preset as the minimum unit (setting) are used. The pointer may be moved by the amount.

  Next, in the above embodiment, α (or β) is added to the set time T0 to make the set time longer by α (or β) than T0, but it is sufficient that the set time can be increased by a set amount. The set time may be increased by multiplying the set value.

  The in-tank sensor may be provided at a portion where the rise and fall of the liquid level near the center of the tank can be detected, and does not necessarily have to be accurately at the center. The range that can be installed varies depending on the shape of the tank. Also, the characteristics of FIG. 3 change depending on the shape of the tank and the mounting position of the sensor in the tank.

DESCRIPTION OF SYMBOLS 1 Fuel tank used as a tank 20 Fuel sensor used as a detection sensor 30 Meter body 30a serving as a display means Display panel 40 Control device constituting a control means 60 Pointer T Setting time Step S2 Average value generating means Fn Averaging processed signal fn-1 Current indication value (current display value location)
Pc tank center position Step S4 Determination means S12, S5 for determining whether the averaged signal is larger than the current display value Comparison means S6 for comparing the current indication value with the first specified level and the second specified level S7, S13, S14 Time setting means T0 + α Set time increased by the first set amount T0 + β Set time increased by the second set amount X1 First specified level X2 Second specified level

Claims (5)

Display means for displaying the liquid level in the tank;
Detecting means for detecting the liquid level in the tank;
Display control means for updating the display value of the display means after holding for a set time each time the liquid level detected by the detection means increases or decreases,
The display control means increases the set time when the liquid level detected by the detection means is lower than a first specified level, and displays the display value on the display means after the increased set time. Update the display value by decreasing the minimum unit,
When the liquid level detected by the detecting means increases from the second specified level, the set time is increased, and the current display value on the display means is increased by the minimum unit after the increased set time. A liquid amount display device that updates the display value. The display control means includes an average value generation means for averaging the liquid level detected by the detection means and generating an average value, and a determination means for determining whether the average value is greater than the current display value. Comparing means for comparing the current display value with the first specified level and the second specified level, and time setting means for setting the set time based on a comparison result of the comparing means,
And the display control means includes
When the average value is compared with the current display value and the average value is smaller than the current display value, and the current display value is smaller than the first specified level, the time setting means Increasing the set time by a first set amount;
When the average value is larger than the current display value by comparing the average value and the current display value, and the current display value is greater than the second specified level, the time setting means The liquid amount display device according to claim 1, wherein the set time is increased by a second set amount.   The liquid amount display device according to claim 1, wherein the detection unit is provided at a horizontal center position of the tank.   The said tank consists of a fuel tank for vehicles, and the said detection means consists of a fuel sensor which detects the said liquid level of the fuel in the said fuel tank for vehicles. Liquid quantity display apparatus of description.   The display means includes a pointer driving device controlled by the display control means, and the pointer is driven by the pointer driving device after the set time by at least the resolution of the pointer driving device that is the minimum unit. The liquid amount display device according to any one of claims 1 to 4, wherein the display value is displayed by indicating a display position on a display board.

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