CN112762978A - Calibration method for vehicle-mounted instrument pointer - Google Patents
Calibration method for vehicle-mounted instrument pointer Download PDFInfo
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- CN112762978A CN112762978A CN202011568231.4A CN202011568231A CN112762978A CN 112762978 A CN112762978 A CN 112762978A CN 202011568231 A CN202011568231 A CN 202011568231A CN 112762978 A CN112762978 A CN 112762978A
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a calibration method of a vehicle-mounted instrument pointer, which comprises the steps of S1, starting a stepping motor to enable the pointer to indicate a zero scale mark; s2, acquiring an included angle between the pointer and the zero scale, taking the included angle as an initial error angle, and judging whether the initial error angle is within a first preset range; s3, when the initial error angle is not in the first preset range, adjusting the rotation of the stepping motor according to the initial error angle, and executing the step S2 again; and S4, when the initial error angle is within a first preset range, taking the total motion angle of the motor as a calibration angle, and gradually adjusting the calibration angle until the rebound angle is stabilized within a range of 1 degree when the mechanical zero is zero. The calibration method can realize calibration of the indication precision of the pointer, so that the indication error of the motor is stably controlled within 1 degree within the working temperature range, the problem of inaccurate indication of the pointer caused by temperature change is solved, the indication stability of the instrument pointer is improved, and the driving safety is favorably improved.
Description
Technical Field
The invention belongs to the technical field of automotive electronics, and particularly relates to a calibration method for a vehicle-mounted instrument pointer.
Background
The automobile instrument has very important significance for the driving safety of a driver, and misleading can be caused to the driving judgment of the driver once the instrument is damaged or the pointer indication is inaccurate, so that dangerous driving of the driver is extremely easy to cause, and even the life safety of drivers and passengers can be influenced. Therefore, before the automobile instrument is shipped out, the indication precision of the automobile instrument is required to be detected and calibrated, so that each scale indication is within the operation range. However, most of the existing automobile instruments realize numerical indication by driving the pointer to rotate on the dial through the stepping motor, the working stability of the stepping motor is very easily influenced by the ambient temperature, when the ambient temperature of the automobile instrument changes, the stepping motor drives the pointer to find zero, the indication on each scale is inaccurate due to different rebound angles, and the generated error can reach more than 3 degrees at most. The requirement of a common vehicle factory on the indication error is required to be within 2 degrees, the requirement of a vehicle factory with a stricter requirement is even required to be within 1 degree, the error is more than 3 degrees, and the superposition error is more than 4 degrees, which obviously cannot be allowed and accepted. Therefore, it is important to develop a calibration method for a vehicle-mounted instrument pointer to improve the indication stability of the instrument pointer and reduce the influence of temperature on the indication stability.
Disclosure of Invention
In order to overcome the defects, the invention provides a calibration method of a vehicle-mounted instrument pointer, which is based on a vehicle-mounted instrument, wherein the vehicle-mounted instrument comprises a dial plate and a pointer, and the pointer is provided with a stepping motor; the method comprises
S1, starting the stepping motor to enable the pointer to indicate a zero scale mark;
s2, acquiring an included angle between the pointer and the zero scale, taking the included angle as an initial error angle, and judging whether the initial error angle is within a first preset range;
s3, when the initial error angle is not in the first preset range, adjusting the rotation of the stepping motor according to the initial error angle, and executing the step S2 again;
and S4, when the initial error angle is within a first preset range, taking the total motion angle of the motor as a calibration angle, and gradually adjusting the calibration angle until the rebound angle is stabilized within a range of 1 degree when the mechanical zero is zero.
Further, when the initial error angle is within a first preset range, the total movement angle of the motor is used as a calibration angle, and the calibration angle is gradually adjusted until the rebound angle at the mechanical zero is stabilized within a range of 1 °, including:
controlling the stepping motor to perform large-angle mechanical gear point returning action;
acquiring a first state error angle between the pointer and a zero scale mark;
judging whether the first state error angle meets a second preset range or not, and if so, directly carrying out high-precision calibration; otherwise, the calibration angle is changed according to a certain amplitude until the first state error between the pointer and the zero scale mark falls into a second preset range, and then high-precision calibration is carried out.
Further, judging whether the first state error angle meets a second preset range, and if so, directly carrying out high-precision calibration; otherwise, changing the calibration angle according to a certain amplitude until the first state error between the pointer and the zero scale mark falls into a second preset range, and then automatically finishing the calibration if the first state error between the pointer and the zero scale mark cannot fall into the second preset range even if the calibration angle is changed twice according to the certain amplitude in the high-precision calibration step.
Further, the high-precision calibration step includes:
increasing a specific value for the calibration angle corresponding to the first state error angle, then controlling the stepping motor to perform large-angle mechanical point returning action again, and acquiring a second state error angle between the pointer and the zero scale mark again;
judging whether the second state error angle meets a third preset range or not, and if so, acquiring a final calibration angle; otherwise, continuously adjusting the calibration angle until the second state error angle between the pointer and the zero scale mark falls into a third preset range, and acquiring the final calibration angle.
Further, the step of obtaining a final calibration angle includes:
subtracting a specific value from the calibration angle corresponding to the second state error angle, then controlling the stepping motor to perform large-angle mechanical gear point returning action, and acquiring a third state error angle between the pointer and the zero scale again;
judging whether the third error angle meets a fourth preset range or not, and if so, taking the calibration angle in the current state as a final calibration angle; otherwise, the calibration angle is continuously adjusted step by step according to the specific variable until the error angle of the third state between the pointer and the zero scale mark falls into a fourth preset range, and the calibration angle in the state is taken as the final calibration angle.
Further, the first preset range is-0.5 degrees; the second preset range is-1 degrees; the third preset range is-1.5 ° -1.5 °; the fourth preset range is-1.5 degrees.
Further, the step of obtaining an included angle between the pointer and the zero scale and taking the included angle as an initial error angle includes:
when the pointer is in a return-to-zero state, a camera is used for shooting the position relation between the pointer and a zero scale mark to form first picture information;
acquiring second picture information of the pointer at the center position of the zero scale mark, and taking the second picture information as a standard picture;
and comparing the first picture information with the standard picture information to obtain the change angle of the pointer position as an initial error angle.
Further, the step of obtaining an included angle between the pointer and the zero scale and taking the included angle as an initial error angle includes:
when the pointer is in a return-to-zero state, a camera is used for shooting the position relation between the pointer and a zero scale mark to form picture information;
marking a pointer center line and a center line of a zero scale mark in the picture information;
and calculating an included angle between the center line of the pointer and the center line of the zero scale mark as an initial error angle.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a calibration method of a vehicle-mounted instrument pointer, which can realize calibration of the indication precision of the pointer by adjusting the rotation of a motor set, so that the indication error of a motor is stably controlled within 1 DEG within the range of working temperature (-40-105 ℃), the problem of inaccurate pointer indication caused by temperature change is effectively solved, the indication stability of the instrument pointer is improved, the driving safety is improved, and unnecessary loss is reduced.
Drawings
Fig. 1 is a schematic flowchart of a calibration method for a pointer of a vehicle instrument in embodiment 1.
Fig. 2 is a schematic flow chart of adjusting the bounce angle at mechanical zero time in embodiment 1.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for purposes of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced and do not represent actual dimensions; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more clearly understand the advantages and features of the present invention and to clearly define the scope of the present invention.
Example 1
As shown in fig. 1-2, the present embodiment provides a calibration method for a pointer of a vehicle-mounted instrument, where the vehicle-mounted instrument includes a dial and the pointer, and the dial is provided with a camera, and the camera is disposed opposite to the dial and is used to obtain picture information of the dial and the pointer. The pointer is connected with a stepping motor, and the stepping motor can drive the pointer to rotate on the dial plate, so that the indicating effect on the scale marks is achieved. And the stepping motor is provided with a control module, the control module is respectively in communication connection with the camera and the stepping motor, the control module can acquire picture information transmitted by the camera in real time, and acquire an indication error of the pointer by analyzing and calculating the picture information, and adjust the rotation angle of the stepping motor according to the indication error to realize automatic calibration of the pointer.
A calibration method of an on-board instrument pointer comprises the following steps:
and S1, starting the stepping motor to enable the pointer to indicate the zero scale mark.
The step motor drives the pointer to indicate the zero scale mark means that the step motor drives the pointer to enter a zero state, but the zero state is an actual zero state and is not an ideal zero state. The ideal zeroing state means that the central line of the pointer and the central line of the zero scale line can be completely superposed, and the indicating error is zero; in the actual zeroing state, the stepping motor drives the pointer to be close to the zero scale line as much as possible, but in reality, the pointer may not be completely overlapped with the zero scale line, and a certain included angle is likely to exist between the pointer and the zero scale line, namely, an indication error exists.
And S2, acquiring an included angle between the pointer and the zero scale, taking the included angle as an initial error angle, and judging whether the initial error angle is within a first preset range.
Specifically, in order to accurately obtain the initial error angle, the pointer is generally driven to be in a return-to-zero state by the stepping motor. When the pointer is in the return-to-zero state, the camera is used for shooting the position relation between the pointer and the zero scale mark, and first picture information is formed. The first picture information records the actual zeroing state. And then acquiring second picture information of which the pointer indicates the center position of the zero graduation line, and taking the second picture information as a standard picture. I.e. the second picture information records the ideal return to zero state. And comparing the first picture information with the standard picture information to obtain the change angle of the pointer position, and taking the change angle as an initial error angle. Of course, the method for obtaining the initial error angle may also be used to obtain other error angles in the present disclosure, and is not limited herein.
Of course, the method of acquiring the initial error angle is not limited to the above method, and for example, when the pointer is in the return-to-zero state (actual return-to-zero state), the camera may be used to capture the positional relationship between the pointer and the zero scale line to form the picture information. The picture information here is used to record the actual zeroing status. Then, the center line of the pointer and the center line of the zero scale mark are marked in the picture information, and the included angle between the center line of the pointer and the center line of the zero scale mark is calculated to be used as an initial error angle.
After the initial error angle is obtained, the initial error angle is compared with a first preset range to judge whether the initial error angle falls into the first preset range. If the initial error angle falls within the first preset range, directly executing step S4; if the initial error angle does not fall within the first predetermined range, step S3 is executed.
And S3, when the initial error angle is not in the first preset range, adjusting the rotation of the stepping motor according to the initial error angle, and executing the step S2 again.
When the initial error angle is not within the first preset range, the initial error angle between the pointer and the zero scale line exceeds the normally allowable error range, and at this time, the rotation of the stepping motor needs to be adjusted step by step, the error angles corresponding to the stepping motor under different rotation angle conditions are obtained respectively, and each error angle is compared with the first preset range in sequence until the error angle meets the first preset range, and then the process goes to step S4.
Generally speaking, the initial error angle between the pointer and the zero graduation line is firstly sent to the control module, the control module firstly controls the motor to rotate by the initial error angle, and then the steps S2 and S3 are repeated until the newly obtained initial error angle value falls within a first preset range. At this time, the next adjustment is performed with the total operation angle of the stepping motor as a calibration angle.
And S4, when the initial error angle is within a first preset range, taking the total motion angle of the motor as a calibration angle, and gradually adjusting the calibration angle until the rebound angle is stabilized within a range of 1 degree when the mechanical zero is zero.
In the specific implementation process, the stepping motor is usually required to be controlled to perform a large-angle mechanical gear point returning action. Then, the first state error angle between the pointer and the zero graduation line in the current state is obtained again. Finally, whether the first state error angle meets a second preset range is judged, and if yes, high-precision calibration is directly carried out; otherwise, the calibration angle is changed according to a certain amplitude until the first state error angle between the pointer and the zero scale mark falls into a second preset range, and then high-precision calibration is carried out. It should be noted that, each time the calibration angle is adjusted, the stepping motor needs to be controlled again to perform the large-angle mechanical stop motion. I.e. each time the calibration angle is changed, the stepper motor needs to restart rotation from the mechanical stop. Of course, in order to save calibration time and improve work efficiency, in general, if the calibration angle is changed twice according to a certain range, the first state error between the pointer and the zero scale mark still cannot fall into the second preset range, the calibration is automatically finished, and the user is reminded to perform manual calibration.
Preferably, in the high-precision calibration step, a specific value is added to the calibration angle corresponding to the first state error angle which satisfies the second preset range, then the stepping motor is controlled to perform the large-angle mechanical-return-to-stop action again, and the second state error angle between the pointer and the zero scale mark is obtained again. Then, judging whether the second state error angle meets a third preset range, and if so, acquiring a final calibration angle; otherwise, continuously adjusting the calibration angle until the second state error angle between the pointer and the zero scale mark falls into a third preset range, and acquiring the final calibration angle.
Preferably, in the step of obtaining the final calibration angle, a specific value may be subtracted from the calibration angle corresponding to the second state error angle that satisfies the third preset range, then the stepping motor is controlled to perform the large-angle mechanical-return-to-stop motion, and the third state error angle between the pointer and the zero scale is obtained again. Then, judging whether the error angle of the third state meets a fourth preset range, and if so, taking the calibration angle in the current state as a final calibration angle; otherwise, the calibration angle is continuously adjusted step by step according to the specific variable until the error angle of the third state between the pointer and the zero scale mark falls into a fourth preset range, and the calibration angle in the state is taken as the final calibration angle.
In this embodiment, the first predetermined range is-0.5 ° to 0.5 °. The second predetermined range is-1 ° -1 °. The third predetermined range is-1.5 deg.. And the fourth predetermined range is-1.5 deg..
Now, the calibration method of the whole instrument pointer will be described in more detail by taking the first preset range of-0.5 to 0.5 degrees, the second preset range of-1 to 1 degree, the third preset range of-1.5 to 1.5 degrees and the fourth preset range of-1.5 to 1.5 degrees as examples. Firstly, in a control strategy of finding a mechanical gear point for a motor of an instrument, a variable is required to be introduced, and the variable is a calibration angle in a calibration process. In the specific calibration process of the instrument, the instrument is powered on, and then the pointer of the instrument is controlled to be indicated on the zero scale mark through an instruction, namely, the instrument enters a return-to-zero state (actual return-to-zero state). Then, the high-definition camera shoots picture information (namely first picture information) indicated by the pointer, and the first picture information is compared with a standard picture (a picture with the pointer accurately indicating the center of the zero scale mark), so that a pointer included angle between the shot first picture information and the standard picture is calculated, wherein the included angle is an error included angle. Then the stepping motor rotates by proper angle step by step, and the error angle change of the pointer under different calibration angles is detected in real time until the error angle falls into the range of-0.5 degrees. At the moment, the motor running angle corresponding to the error angle falling in the range of-0.5 degrees is the calibration angle.
Then based on the calibration angle, the stepping motor rebounds stably within the range of 1 degree when the mechanical zero is searched. Specifically, in the process of gradually adjusting the calibration angle, the stepping motor needs to be controlled by a production instruction to perform the action of returning to the mechanical stop point at a large angle, and then the error angle indicated by the pointer is obtained by a method of taking an instrument picture by the camera. And judging whether the error angle (the first state error angle) of the current state falls into a second preset range of-1 degrees, if so, directly entering a high-precision calibration step. Otherwise, the first state error angle is continuously judged to belong to the condition of being larger than +1 degrees or belonging to the condition of being smaller than-1 degrees. When the first state error angle is larger than +1 degrees, the calibration angle is reduced by 1.5 degrees, the stepping motor is enabled to perform the action of returning to the mechanical gear point by a large angle again, the error angle of the pointer is obtained again, and whether the newly obtained error angle falls into a second preset range of-1 degrees to 1 degrees or not is judged again. And when the first state error angle is smaller than-1 degrees, increasing the calibration angle by 1.5 degrees, then enabling the stepping motor to perform large-angle return mechanical stop point action again, and also needing to obtain the error angle of the pointer again and judging whether the newly obtained error angle falls into a second preset range of-1 degrees again. If the error angle obtained again does not fall within the second preset range after the calibration angle is adjusted once, the adjustment process needs to be repeated, which is not described herein. Of course, if the calibration angle is changed twice according to the above rule, the error angle between the pointer and the zero scale line cannot fall within the second preset range, the calibration is automatically finished, and the user is reminded to perform manual calibration.
In the high-precision calibration process, the calibration angle corresponding to the first state error angle falling within the second preset range needs to be increased by 1 °, then the stepping motor is enabled to perform large-angle mechanical stop point returning action again, and the error angle of the pointer, namely the second state error angle, is obtained again. And continuously judging whether the second state error angle falls into a third preset range of-1.5 degrees or not, and if so, directly determining the final calibration angle. If the second state error angle does not fall within the third preset range, that is, the second state error angle exceeds 1.5 °, the calibration angle needs to be sequentially increased by 0.9 °, 0.8 °, 0.7 °, 0.6 °, and 0.5 °, and the error angle indicated by the pointer is respectively obtained under the condition of each calibration angle value, until the error angle can fall within the third preset range, the final calibration angle is determined continuously.
And finally, in the process of obtaining the final calibration angle, reducing the calibration angle corresponding to the second state error angle falling into a third preset range by 1 degree, then controlling the stepping motor to perform large-angle mechanical stop point returning action, and obtaining the error angle at the current moment, namely the third state error angle. And continuously judging whether the error angle of the third state falls into a fourth preset range of-1.5 degrees or not. If so, directly taking the calibration angle corresponding to the third state error angle falling within the fourth preset range as the final calibration angle. If the third state error angle does not fall within the fourth preset range, that is, the third state error angle exceeds 1.5 °, the calibration angle needs to be reduced by 0.9 °, 0.8 °, 0.7 °, 0.6 °, and 0.5 ° in sequence, and meanwhile, the error angles indicated by the pointer are respectively obtained under different value conditions of each calibration angle until the error angles of the pointer fall within the fourth preset range. At this time, the calibration angle corresponding to the error angle falling within the fourth preset range may be used as the final calibration angle, and the calibration may be ended.
The embodiment provides a calibration method for a vehicle-mounted instrument pointer, which can calibrate the indication precision of the pointer by adjusting the rotation of a motor set, so that the indication error of a motor is stably controlled within 1 degree within the range of working temperature (-40-105 degrees), the problem of inaccurate indication of the pointer caused by temperature change is effectively solved, the indication stability of the instrument pointer is improved, the driving safety is improved, and unnecessary loss is reduced.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The calibration method of the vehicle-mounted instrument pointer is characterized in that based on a vehicle-mounted instrument, the vehicle-mounted instrument comprises a dial plate and a pointer, and the pointer is provided with a stepping motor; the method comprises
S1, starting the stepping motor to enable the pointer to indicate a zero scale mark;
s2, acquiring an included angle between the pointer and the zero scale, taking the included angle as an initial error angle, and judging whether the initial error angle is within a first preset range;
s3, when the initial error angle is not in the first preset range, adjusting the rotation of the stepping motor according to the initial error angle, and executing the step S2 again;
and S4, when the initial error angle is within a first preset range, taking the total motion angle of the motor as a calibration angle, and gradually adjusting the calibration angle until the rebound angle is stabilized within a range of 1 degree when the mechanical zero is zero.
2. The method for calibrating the vehicle instrument pointer according to claim 1, wherein the step of taking the total movement angle of the motor as the calibration angle when the initial error angle is within a first preset range and gradually adjusting the calibration angle until the bounce angle of the mechanical zero is stabilized within 1 ° comprises:
controlling the stepping motor to perform large-angle mechanical gear point returning action;
acquiring a first state error angle between the pointer and a zero scale mark;
judging whether the first state error angle meets a second preset range or not, and if so, directly carrying out high-precision calibration; otherwise, the calibration angle is changed according to a certain amplitude until the first state error between the pointer and the zero scale mark falls into a second preset range, and then high-precision calibration is carried out.
3. The method for calibrating the vehicle-mounted instrument pointer as claimed in claim 2, wherein, when the first state error angle is judged to meet the second preset range, high-precision calibration is directly performed if the first state error angle meets the second preset range; otherwise, changing the calibration angle according to a certain amplitude until the first state error between the pointer and the zero scale mark falls into a second preset range, and then automatically finishing the calibration if the first state error between the pointer and the zero scale mark cannot fall into the second preset range even if the calibration angle is changed twice according to the certain amplitude in the high-precision calibration step.
4. The method for calibrating the vehicle instrument pointer according to claim 3, wherein the high-precision calibration step comprises:
increasing a specific value for the calibration angle corresponding to the first state error angle, then controlling the stepping motor to perform large-angle mechanical point returning action again, and acquiring a second state error angle between the pointer and the zero scale mark again; judging whether the second state error angle meets a third preset range or not, and if so, acquiring a final calibration angle; otherwise, continuously adjusting the calibration angle until the second state error angle between the pointer and the zero scale mark falls into a third preset range, and acquiring the final calibration angle.
5. The method for calibrating a vehicle instrument pointer according to claim 4, wherein the step of obtaining a final calibration angle comprises:
subtracting a specific value from the calibration angle corresponding to the second state error angle, then controlling the stepping motor to perform large-angle mechanical gear point returning action, and acquiring a third state error angle between the pointer and the zero scale again;
judging whether the third error angle meets a fourth preset range or not, and if so, taking the calibration angle in the current state as a final calibration angle; otherwise, the calibration angle is continuously adjusted step by step according to the specific variable until the error angle of the third state between the pointer and the zero scale mark falls into a fourth preset range, and the calibration angle in the state is taken as the final calibration angle.
6. The method for calibrating a vehicle instrument pointer according to claim 5, wherein the first predetermined range is-0.5 ° -0.5 °; the second preset range is-1 degrees; the third preset range is-1.5 ° -1.5 °; the fourth preset range is-1.5 degrees.
7. The method for calibrating the vehicle instrument pointer according to claim 1, wherein the step of obtaining the included angle between the pointer and the zero scale and taking the included angle as the initial error angle comprises the following steps:
when the pointer is in a return-to-zero state, a camera is used for shooting the position relation between the pointer and a zero scale mark to form first picture information;
acquiring second picture information of the pointer at the center position of the zero scale mark, and taking the second picture information as a standard picture;
and comparing the first picture information with the standard picture information to obtain the change angle of the pointer position as an initial error angle.
8. The method for calibrating the vehicle instrument pointer according to claim 1, wherein the step of obtaining the included angle between the pointer and the zero scale and taking the included angle as the initial error angle comprises the following steps:
when the pointer is in a return-to-zero state, a camera is used for shooting the position relation between the pointer and a zero scale mark to form picture information;
marking a pointer center line and a center line of a zero scale mark in the picture information;
and calculating an included angle between the center line of the pointer and the center line of the zero scale mark as an initial error angle.
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| US20020039011A1 (en) * | 2000-09-29 | 2002-04-04 | Yazaki Corporation | Apparatus and method for initializing stepper motor |
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