JP5643627B2 - Water level measuring device - Google Patents

Description

  The present invention relates to a water level measuring device that can stabilize the display of a display unit even if there is a short-term change in the level of stored water in a measured water storage unit.

  As a method for evaluating the drainage performance of the tire, for example, as shown in FIG. 4A, the tire t is mounted on the vehicle M, and the water is stored in the water storage section b (100R cornering) by a test driver. Methods for conducting tests are known. In this test method, as shown in FIG. 4 (b), the water level detection means d for detecting the water level c of the water reservoir b at a predetermined cycle, and the detection signal detected by the water level detection means d are input. A measuring device a including a control device e and a display unit f that displays a water level state based on a signal from the control device e is used. Then, when entering the water storage part b, the test driver confirms that the water level is a testable state by the display part f, and the drainage test is started. In addition, a rotating lamp that emits light only when it is in a testable water level is used for the display unit f.

  However, since such a test method is performed outdoors, the water level of the water storage section changes in a short time due to the influence of wind waves, etc., even though the water level does not change on a time average basis, Following this, chattering in which the display on the display unit repeats on / off (light emission / extinguishing) occurs, which makes it difficult to accurately determine the start of the drainage performance test. Related technologies include the following.

JP 2003-156378 A Japanese Utility Model Publication No. 57-105935 Japanese Patent Laid-Open No. 07-174504 JP 2007-225556 A JP 2004-333180 A JP 2006-29803 A Japanese Unexamined Patent Publication No. 07-198341

The present invention has been made devised in view of the above problems, it ignores the water level changes in the short time of the measured water reservoir, to provide a water level measuring device capable of stable display of the display unit Is the main purpose.

The invention according to claim 1 of the present invention is a water level measuring device for measuring the water level of the water storage section to be measured, the water level detecting means capable of detecting the water level of the water storage section to be measured, and the detection of the water level detecting means. A control unit to which a signal is input, and a display unit that displays information corresponding to the water level based on the signal from the control unit, wherein the control unit is a detection signal of the water level detection unit at a predetermined sampling period. together examine the every sampling period, the detection signal, when showing the water level in the range of the set water level a predetermined time longer than the sampling period, the range of the set water level on the display unit a water level measuring apparatus comprising a steps of outputting a signal for displaying that the inner.

  The invention according to claim 2 is the water level measuring device according to claim 1, wherein the long time is at least three times the sampling period.

  Further, the invention according to claim 3 is characterized in that the water level detection means includes a main body that is in contact with the bottom surface of the measured water storage section and is self-supporting, and a measurement section that is fixed to the main body. Providing a water level measurement space into which the water stored in the water reservoir to be measured flows, the measurement unit being fixed at the upper end to the main body and extending at the lower end in the water level measurement space and terminating above the bottom surface of the water reservoir to be measured The water level measuring device according to claim 1, which is an electrode rod that detects a water level by a short circuit caused by contact with water.

  According to a fourth aspect of the present invention, the electrode rod includes a first electrode rod in which a distance between the lower end and a bottom surface of the measured water storage section is set to a lower limit value of the set water level. It is a water level measuring apparatus of description.

  According to a fifth aspect of the present invention, the electrode rod includes a second electrode rod in which a distance between the lower end and the bottom surface of the measured water storage section is set to an upper limit value of the set water level. Or it is the water level measuring apparatus of 4.

The invention according to claim 6 is the container according to any one of claims 3 to 5, wherein the main body is in the shape of a container having a bottom portion having a peripheral wall that prevents undulations of stored water from propagating to the water level measurement space. This is a water level measuring device. Further, the present invention is a tire drainage performance test using the water level measuring device according to any one of claims 1 to 6.

  The water level measuring device of the present invention corresponds to the water level based on the signal from the water level detecting means capable of detecting the water level of the measured water storage section, the control means to which the detection signal of the water level detecting means is input, and the control means. And a display unit for displaying the information. In such a water level measurement device, information corresponding to the water level detected by the water level detection means is displayed on the display unit by a signal from the control means. Further, the control means examines the detection signal of the water level detection means at a predetermined sampling cycle, and when the detection signal indicates a water level within a predetermined set water level range, Outputting a signal for displaying on the display section that the water level is within the set water level for a longer time. Thus, even when the water level temporarily falls outside the set water level range due to wind or the like in the next sampling cycle, the display indicating that it is within the set water level range continues. Accordingly, chattering and the like can be prevented. Therefore, for example, by using the present invention for the drainage performance test, the test driver can accurately determine whether or not the drainage performance test can be started by displaying the stable display unit.

It is a side view of the water level detection apparatus of one embodiment of the present invention. It is a flowchart of the water level measuring apparatus of one Embodiment of this invention. (A) thru | or (c) is a figure which shows the input-output example of a detection signal and a signal. (A) is a top view explaining a drainage test, (b) is a side view which shows the conventional water level measuring apparatus used for the drainage test of (a).

Hereinafter, one embodiment of a water level measuring device of the present invention is described based on a drawing.
The water level measuring device of the present invention measures the water level of the measured water storage section. The water level measuring device of the present embodiment is, for example, a tire drainage performance test, in particular, a lateral aquaplaning test in which a tire is mounted on a vehicle and a measured water storage portion is actually driven by a test driver to measure lateral acceleration at that time. It is suitably used for measuring the water level.

  For example, the water depth at the time of the test is set to 5 to 15 mm in consideration of the road surface in the rain when a vehicle of various categories such as a passenger car, a truck, or a motorcycle actually travels. The

  As shown in FIG. 1, the measuring apparatus 1 of the present embodiment includes a water level detection means 2 that can detect the water level S of the water storage section T to be measured, and a control means 3 that receives a detection signal from the water level detection means 2. And a display unit 4 that displays information corresponding to the water level S based on a signal from the control means 3.

  The water level detection means 2 includes a main body 5 that abuts against the bottom surface Ta of the water storage section T to be measured and a measuring section 6 fixed to the main body 5.

  The main body 5 of the present embodiment has a peripheral wall 5a extending substantially perpendicular to the water surface, and has a container shape and a cylindrical shape with the bottom portion 5b released. Such a main body 5 provides a water level measurement space 5c1 into which the water stored in the measured water storage section T flows into the interior 5c of the main body section 5.

  In addition, the peripheral wall 5a of the present embodiment prevents the waving of the stored water from propagating to the water level measurement space 5c1, and helps the measurement unit 6 to detect the accurate water level S. Note that, for example, one or a plurality of openings O through which the water stored in the water storage portion T to be measured smoothly flows in and out is provided in the lower portion of the peripheral wall 5a of the main body 5 of the present embodiment. Such a main body 5 is preferably made of a conductive metal material such as a stainless alloy, and is grounded to the ground. The main body 5 is not limited to a cylindrical shape, and various shapes such as a prismatic shape and a rectangular shape can be adopted.

  The measurement unit 6 is preferably a known electrode rod 7 that is inexpensive and can be configured with relatively few peripheral devices. A predetermined voltage is applied to the electrode rod 7, and when the electrode rod 7 comes into contact with the water having conductivity of the water storage portion T to be measured, the electrode rod 7 is short-circuited and a current flows to detect the water level. When the electrode rod 7 is used as the measurement unit 6 in this manner, for example, auxiliary equipment such as a personal computer can be reduced as compared with the case where a known ultrasonic sensor is used as the measurement unit 6. 1 can be simplified.

  The upper end 8 of the electrode rod 7 of this embodiment is fixed to the upper portion 5d of the main body 5 via a non-conductive fixing tool. Further, the lower end 9 of the electrode rod 7 extends into the water level measurement space 5c1 and terminates above the bottom surface Ta of the measured water storage portion T. Note that the electrode rod 7 of the present embodiment extends substantially perpendicular to the water surface.

  The electrode rod 7 is preferably composed of at least two. In this embodiment, the first electrode rod 10 having a large length and the first electrode rod 10 having a smaller length than the first electrode rod 10 are used. 2 electrode rods 11, and the electrode rods 10 and 11 are arranged substantially in parallel.

  In this embodiment, the distance La between the lower end 10a of the first electrode rod 10 and the bottom surface Ta of the measured water storage section T is set to a preset lower limit value S1a of the set water level S1, for example. In addition, the distance Lb between the lower end 11a of the second electrode rod 11 and the bottom surface Ta of the measured water storage section T is set to the upper limit value S1b of the set water level S1. That is, in the present embodiment, the set water level S1 indicates a water level range having upper and lower limits. Therefore, the water level detection means 2 of the present embodiment is such that the water level below the lower limit S1a of the set water level S1 at which the first electrode rod 10 is not short-circuited, the first electrode rod 10 is short-circuited, and the second electrode rod 11 is The water level within the range of the set water level S1 that is not short-circuited and the water level that exceeds the upper limit value S1b of the set water level S1 at which the second electrode rod 11 is short-circuited can be detected.

  The control means 3 examines the detection signal E of the water level detection means 2 at a predetermined sampling period, and outputs a predetermined signal F on the display 4 based on this detection signal.

  In consideration of the visibility of the test driver, the display unit 4 is preferably composed of a light emitter such as a rotating lamp. In the present embodiment, one rotating lamp is used as the display unit 4.

Next, FIG. 2 shows a flow of a processing procedure of the control means 3 of the water level detection device 1 configured as described above.
First, when the main power supply of the water level detection device 1 is turned on, the first and second electrode rods 10 and 11 output detection signals E1 and E2 to the control means 3, respectively. The control means 3 starts measuring time (step ST1) and determines whether or not a predetermined sampling period has elapsed (step ST2). In the present embodiment, the sampling period is set to 0.3 seconds. When the sampling period elapses after the start of timing (Y in step ST2), the control means 3 performs a water level check that stores the detection signals E1 and E2 of the first and second electrode rods 10 and 11 in an internal memory or the like. (Step ST3).

  Next, when the detection signals E1 and E2 indicate the water level exceeding the lower limit value S1a and less than the upper limit value S1b (that is, the water level S is within the set water level S1) (step ST4 and step ST4). The signal F for causing the display unit 4 to display that the water level S of the measured reservoir T is within the range of the set water level S1 for a time longer than the sampling cycle. Is output (step ST6). Further, the control means 3 returns to step ST1 and repeats the subsequent steps while continuing the ON signal of step ST6. Thereby, when the water level S is not within the range of the set water level S1 in the next sampling cycle (for example, N in step ST4), since the signal F is continuously output at that time, the level of the set water level S1 The display indicating that it is within the range is continued. Accordingly, the display on the display unit 3 is stabilized and chattering and the like can be prevented. Therefore, for example, by using the present invention as a water level measuring device for a lateral aquaplaning test, an operating test driver can accurately determine whether or not the test can be started. The long time is preferably set to a time that is at least three times the sampling period, and is set to 1.0 seconds in this embodiment.

  3A to 3C show a specific processing procedure of the control means 3. FIG. 3A shows that the detection signals E1 and E2 are within the range of the set water level S1 for each sampling period. Thereby, the control means 3 outputs the signal F for every sampling period, and it is displayed on the display part 4 that it is in the range of the setting water level S1 continuously. In this embodiment, the output time of the signal F is more than 3 times and less than 4 times the sampling period. FIG. 3B shows that the detection signals E1 and E2 are within the range of the set water level S1 in the first sampling cycle, and the detection signals E1 and E2 are out of the range of the set water level S1 in the subsequent sampling cycles. It is shown that. Thereby, the control means 3 outputs the signal F in the first sampling period, and does not output the signal F in the subsequent sampling periods. Thereby, after the display means 4 displays that it is in the range of the setting water level S1 beyond the 4th sampling period, it displays that it is outside the range of the setting water level S1. FIG. 3C shows that the detection signals E1 and E2 are within the set water level S1 in the first and fourth sampling periods. In addition, in the second, third and fifth sampling cycles, the detection signals E1 and E2 are outside the set water level S1. As a result, the signal F is output at the first and fourth sampling cycles, and the display means 4 continuously displays that it is within the set water level S1.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications. For example, in the above embodiment, one rotating lamp as the display unit 4 is used, but the control means 3 that outputs the detection signals E1 and E2 of the electrode rods 10 and 11 using two rotating lamps is used. An aspect may be sufficient.

DESCRIPTION OF SYMBOLS 1 Water level measuring device 2 Water level detection means 3 Control means 4 Display part E Detection signal F Signal S Water level S1 Set water level T Measured water storage part

Claims (7)

A water level measuring device for measuring the water level of a measured water storage unit,
Water level detecting means capable of detecting the water level of the measured water storage unit;
Control means to which a detection signal of the water level detection means is input, and a display unit that displays information corresponding to the water level based on a signal from the control means,
The control means checks the detection signal of the water level detection means at a predetermined sampling period, and when the detection signal indicates a water level within a predetermined set water level for each sampling period. water level measuring apparatus comprising a steps of outputting a signal for displaying a longer time than the sampling period, is in the range of the set water level on the display unit.   The water level measurement device according to claim 1, wherein the long time is at least three times the sampling period. The water level detection means includes a main body that is in contact with the bottom surface of the measured water storage section and is self-supporting, and a measurement section fixed to the main body.
The main body provides a water level measurement space into which the water stored in the water storage section to be measured flows,
The measuring unit is an electrode bar whose upper end is fixed to the main body and whose lower end extends into the water level measurement space and terminates above the bottom surface of the water storage unit to be measured, and detects the water level by a short circuit due to contact with water. The water level measuring device according to claim 1.   4. The water level measuring device according to claim 3, wherein the electrode bar includes a first electrode bar in which a distance between the lower end and a bottom surface of the water storage section to be measured is set to a lower limit value of the set water level.   5. The water level measuring device according to claim 3, wherein the electrode bar includes a second electrode bar in which a distance between the lower end and a bottom surface of the water storage section to be measured is set to an upper limit value of the set water level.   The water level measuring device according to any one of claims 3 to 5, wherein the main body has a container shape with a bottom portion having a peripheral wall for preventing undulation of water from propagating to the water level measuring space. A tire drainage performance test using the water level measuring device according to any one of claims 1 to 6.

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