JP2010185715A - Method of measuring displacement of engine mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of measuring displacement of engine mounts capable of rapidly and accurately measuring the displacement of engine mounts with respect to a vehicle using measuring instruments. <P>SOLUTION: The vehicle 1 is disposed on a surface plate 11; a coordinate system P (x, y, z) of a vehicle reference is determined from the directions of an axle of the vehicle 1; and three-dimensional positions of the engine mount in the coordinate system P (x, y, z) of a vehicle reference are calculated by a prescribed coordinates conversion determinant using original positions of measuring instruments 21, 51 in the coordinate system P (x, y, z) of the vehicle reference and the three-dimensional positions of engine mount in the coordinate system Q (X, Y, Z) of a measuring instrument reference. Thus, displacement of engine mount in the coordinate system P (x, y, z) of the vehicle reference can be measured rapidly and accurately. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine mount displacement measuring method for measuring displacement of an engine mount in an engine room.

  For example, when measuring the displacement of an engine mount in an engine room, the behavior of the tip of a bolt that holds the mount and bracket is measured by a measuring instrument. The direction of the behavior of the bolt tip measured by the measuring instrument is indicated by a coordinate system based on the measuring instrument. Therefore, in order to obtain the displacement of the engine mount with respect to the vehicle, it is necessary to express it in a vehicle reference coordinate system. Conventionally, when an operator attaches a measuring instrument, the measuring instrument-based coordinate system is adjusted by the operator's sense so that it matches the vehicle-based coordinate system.

  Patent Document 1 discloses a coordinate axis conversion method in which three-dimensional coordinate values of a plurality of points in a vehicle opening are measured by a measuring instrument having a unique coordinate system and converted into a carline (vehicle) coordinate system. Yes.

Japanese Patent Laid-Open No. 01-240807

  In the case of the above-described adjustment by the operator, there is a possibility that individual differences may occur, and it cannot be denied that accuracy is lacking. In addition, a method for determining a vehicle-based coordinate system has not been established. However, there is a demand for measuring the displacement of the engine mount with respect to the vehicle by matching the coordinate system of the measuring instrument with the coordinate system of the vehicle.

  The present invention has been made in view of the above points, and an object thereof is to provide an engine mount displacement measuring method capable of quickly and accurately measuring the displacement of the engine mount with respect to the vehicle using a measuring instrument.

により、車両基準の座標系におけるエンジンマウントの三次元位置を算出するステップと、を含むことを特徴としている。 The engine mount displacement measuring method of the present invention that solves the above problems is an engine mount displacement measuring method that measures the displacement of the engine mount relative to the vehicle using a measuring instrument, wherein the vehicle is arranged on a surface plate, and the vertical direction of the surface plate is Is determined as the z-axis direction of the vehicle, the axle direction of the vehicle is determined as the y-axis direction, and the direction orthogonal to the z-axis direction and the y-axis direction is uniquely defined as the x-axis direction that is the direction along the vehicle front-rear direction. Using the step of determining the vehicle reference coordinate system, the origin position of the measuring instrument in the vehicle reference coordinate system, and the three-dimensional position of the engine mount in the instrument reference coordinate system, Coordinate transformation determinant

And calculating the three-dimensional position of the engine mount in the vehicle-based coordinate system.

  According to the engine mount displacement measuring method of the present invention, a vehicle is placed on a surface plate, the vertical direction of the surface plate is determined as the z-axis direction of the vehicle, the vehicle axle direction is determined as the y-axis direction, and z Since the direction orthogonal to the axial direction and the y-axis direction is uniquely determined as the x-axis direction that is the direction along the front-rear direction of the vehicle, the vehicle-based coordinate system can be easily determined.

  Then, using the origin position of the measuring instrument in the vehicle-based coordinate system and the three-dimensional position of the engine mount in the measuring instrument-based coordinate system, the coordinate transformation determinant calculates the three-dimensional engine mount in the vehicle-based coordinate system. Since the position is calculated, the displacement of the engine mount in the vehicle reference coordinate system can be measured quickly and accurately.

  According to the present invention, since the vehicle reference coordinate system can be easily determined and the three-dimensional position of the engine mount in the vehicle reference coordinate system can be calculated, the displacement of the engine mount in the vehicle reference coordinate system can be calculated. Can be measured quickly and accurately.

The figure which shows the outline | summary of the coordinate system of the engine mount displacement measuring method in this Embodiment. The figure explaining the coordinate system of a vehicle standard. The figure which shows Example 1 which is a method of determining the coordinate system of a vehicle reference | standard. The side view shown from the arrow K direction of FIG. The figure which shows Example 2 which is a method of determining the coordinate system of a vehicle reference | standard. The figure which shows the usage method of the jig | tool in Example 2. FIG. The figure which shows Example 3 which is a method of measuring the displacement of the engine mount with respect to the coordinate system of a vehicle reference | standard. The figure explaining the structure of a plane plate. FIG. 10 is a diagram for explaining a coordinate conversion method according to the third embodiment. FIG. 10 is a diagram illustrating a coordinate conversion method according to the fourth embodiment.

  Next, an embodiment of the present invention will be described with reference to FIG.

  In the engine mount displacement measuring method in the present embodiment, first, a vehicle-based coordinate system PP (x, y, z) is determined (step S1). Then, the displacement of the engine mount 4 is measured with a measuring instrument (step S2), and the measured displacement is converted from the measuring instrument reference coordinate system Q (X, Y, Z) to the vehicle reference coordinate system P (x, y, z). ) And shown as a displacement with respect to the vehicle 1 (step S3).

[Determination of vehicle-based coordinate system P: Step S1]
The vehicle-based coordinate system P (x, y, z) arranges the vehicle 1 on the surface plate 11, determines the vertical direction of the surface plate 11 as the z-axis direction of the vehicle 1, and sets the vehicle axis direction of the vehicle 1 to y. An axial direction is determined, and a direction orthogonal to the z-axis direction and the y-axis direction is uniquely determined as an x-axis direction that is a direction along the front-rear direction of the vehicle 1. As shown in FIG. 1, a vehicle-based coordinate system P (x, y, z) is determined by the x-axis, y-axis, and z-axis directions.

[Measurement by measuring instrument: Step S2]
The displacement of the engine mount 4 is measured by a measuring instrument. The measuring method using a measuring instrument is performed, for example, by measuring the behavior of the bolt tip by disposing the measuring instrument facing the bolt tip of the bolt that fastens the engine mount 4 and the bracket in the engine room.

[Coordinate system conversion: Step S3]
The displacement of the engine mount 4 measured by the measuring instrument is indicated by a measuring instrument reference coordinate system Q (X, Y, Z) as shown in FIG. Therefore, the vehicle reference coordinate system P (x, y, z) is converted to indicate the displacement with respect to the vehicle 1. The coordinate system conversion process is performed by an arithmetic processing unit (not shown) such as a computer.

Here, the origin position (A, B, C) of the measuring instrument in the vehicle-based coordinate system P (x, y, z) and the engine mount 4 in the measuring instrument-based coordinate system Q (X, Y, Z). Using the three-dimensional position (L, M, N) and the three-dimensional position (l, m, N) of the engine mount in the vehicle reference coordinate system P (x, y, z) based on the following coordinate transformation determinant n) is calculated.

  According to the engine mount displacement measuring method in the present embodiment described above, in the determination (step S1) of the vehicle-based coordinate system P (x, y, z), the vertical direction (z-axis direction) and the axle direction (y-axis) Direction), the vehicle reference coordinate system P (x, y, z) can be easily determined.

  In the conversion of the coordinate system, the origin position (A, B, C) of the measuring instrument in the vehicle-based coordinate system P and the three-dimensional engine mount 4 in the measuring instrument-based coordinate system Q (X, Y, Z). The three-dimensional position (l, m, n) of the engine mount 4 in the vehicle reference coordinate system P (x, y, z) is calculated by the coordinate transformation determinant using the position (L, M, N). Therefore, the displacement of the engine mount 4 in the vehicle reference coordinate system P (x, y, z) can be measured quickly and accurately.

  Next, a specific example of a method for determining the vehicle-based coordinate system P (x, y, z) will be described with reference to FIGS. FIG. 2 shows a vehicle-based coordinate system P (x, y, z), FIGS. 3 and 4 show Example 1, and FIGS. 5 and 6 show Example 2. FIG.

  In the first embodiment, as shown in FIGS. 3 and 4, the jig 12 is used to determine the y-axis direction in the vehicle reference coordinate system P (x, y, z). The jig 12 is made of a straight member having a length equal to or greater than the distance between the left and right wheels, and has a substantially right-angled isosceles triangle shape in cross section.

  The vehicle 1 is placed on the surface plate 11 and the left and right tires 2 have the same air pressure, and the jig 12 is placed on the surface plate 11 and pushed to the left and right tires 2 and 3 with equal thrust. Hit (see Figure 4). Thereby, the extending direction of the jig 12 and the axle direction of the vehicle 1 can be matched, and the y-axis direction in the vehicle reference coordinate system P (x, y, z) as shown in FIG. Can be easily determined.

  In the second embodiment, as shown in FIGS. 5 and 6, the jig 13 is used to determine the y-axis direction in the vehicle-based coordinate system P (x, y, z). The jig 13 has a pair of parallel bars 13a and 13b having a length equal to or greater than the distance between the left and right wheels and a diameter that allows the tires 2 and 3 of the vehicle 1 to ride over.

  The jig 13 is placed on the surface plate 1 and overtaken by the vehicle 1, and the left and right tires 2 and 3 are dropped between the pair of parallel bars 13a and 13b. Thereby, the extending direction of the jig 13 and the axle direction of the vehicle 1 can be made coincident with each other. As shown in FIG. 2, the y-axis direction in the vehicle reference coordinate system P (x, y, z) Can be easily determined.

  Next, a specific example of a method for converting the instrument-based coordinate system Q (X, Y, Z) to the vehicle-based coordinate system P (x, y, z) will be described with reference to FIGS. . 7 to 9 show the third embodiment, and FIG. 10 shows the fourth embodiment.

  In the third embodiment, a method of converting each coordinate system Q (X, Y, Z) of a plurality of measuring instruments 21 capable of 6-axis measurement into a vehicle-based coordinate system P will be described. Here, the camera device 31 and the flat plate 41 are used.

  The plurality of measuring instruments 21 are arranged at positions corresponding to the plurality of engine mounts existing in the engine room, and individually measure the displacement of each engine mount.

  As shown in FIG. 7, the camera device 31 is supported by a frame frame 32 so as to be movable. The frame body 32 is the same as the lower frame 33 and the upper frame 34 arranged in the y-axis direction above the engine room when the lower frame 33 is arranged on the surface plate 11 in the y-axis direction. 1 has side frames 35 and 36 that extend vertically on both the left and right sides of 1 and connect both ends of the upper frame 34 and the lower frame 33.

  The frame body 32 has a lower frame 33 having the same shape as the jig 12 of the first embodiment or the jig 13 of the second embodiment, and the vehicle reference coordinate system P (x, y , Z) so that the y-axis direction can be determined. Accordingly, the frame body 32 is arranged on the surface plate 11 so as to extend along the yz plane including the y-axis direction and the z-axis direction in the vehicle-based coordinate system P (x, y, z). Can do.

  Then, by moving the camera device 31 along the frame body 32, the coordinate system of the camera device 31 supported by the frame body 32 is made to coincide with the vehicle reference coordinate system P (x, y, z). be able to.

  The plane plate 41 has a configuration in which at least three or more points 42, 43, and 44 for determining a plane are imprinted on the surface 41a, and distances d1 to d3 between these points 42 to 44 are known. is doing. As shown in FIG. 9, the flat plate 41 is installed at a position where it can be measured simultaneously from both the camera device 31 and each measuring instrument 21. Accordingly, the position (origin) and posture (coordinate system) of each measuring instrument 21 can be acquired, and the coordinate system Q of each measuring instrument 21 is converted into a vehicle-based coordinate system P (x, y, z). can do.

  In the fourth embodiment, a method of converting each coordinate system Q (X, Y, Z) of a plurality of measuring instruments 51 that cannot perform 6-axis measurement into a vehicle-based coordinate system P (x, y, z) will be described. . Here, as in the third embodiment, the camera device 31 and the flat plate 41 are used.

  Each measuring instrument 51 is arranged at a position corresponding to each of a plurality of engine mounts existing in the engine room, and individually measures the displacement of each engine mount.

  As shown in FIG. 10, the plane plate 41 is installed in each measuring instrument 51 so as to have the same plane as one surface of the measuring instrument reference coordinate system Q (any one of the xy plane, the yz plane, and the xz plane). The

  As in the third embodiment, at least three or more points 42, 43, 44 for determining the plane are imprinted on the surface 41a of the flat plate 41, and the distances d1-d3 between these points 42-44. Is known, and in addition, the distance from the flat plate 41 to the origin of the measuring instrument 51 is known.

  The camera device 31 is moved along the frame frame 32 and fixed at positions where the measuring instruments 51 and the points 42 to 44 of the flat plate 41 can be confirmed, and the coordinates (0, Y1, Z1) at that time are frame frames. Read on the scale marked 32. This is obtained for each measuring instrument 51, and the coordinate system Q (X, Y, Z) of each measuring instrument 51 can be converted into a vehicle-based coordinate system P (x, y, z).

  According to the above-described engine mount displacement measuring method, the vehicle 1 is arranged on the surface plate 11, the vertical direction of the surface plate 11 is determined as the z-axis direction of the vehicle 1, and the axle direction of the vehicle 1 is defined as the y-axis direction. Since the direction orthogonal to the z-axis direction and the y-axis direction is uniquely determined as the x-axis direction that is a direction along the front-rear direction of the vehicle 1, the vehicle-based coordinate system P (x, y, z) is determined. Can be easily determined.

  The origin positions of the measuring instruments 21 and 51 in the vehicle-based coordinate system P (x, y, z) and the three-dimensional position of the engine mount in the measuring instrument-based coordinate system Q (X, Y, Z) are used. Thus, since the three-dimensional position of the engine mount in the vehicle reference coordinate system P (x, y, z) is calculated from the coordinate transformation determinant, the engine mount in the vehicle reference coordinate system P (x, y, z) is calculated. Displacement can be measured quickly and accurately.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the above-mentioned jigs 12 and 13 are one of specific examples, and may have any structure that can determine the axle direction of the vehicle 1.

DESCRIPTION OF SYMBOLS 1 Vehicle 2, 3 Tire 11 Surface plate 12, 13 Jig 21 Measuring device 31 Camera apparatus 32 Frame frame body 33 Lower frame 41 Plane plate 41a Surface 42, 43, 44 Point 51 Measuring device

Claims (1)

In the engine mount displacement measuring method for measuring the displacement of the engine mount with respect to the vehicle using a measuring instrument,
A vehicle is arranged on a surface plate, a vertical direction of the surface plate is determined as a z-axis direction of the vehicle, an axle direction of the vehicle is determined as a y-axis direction, and is orthogonal to the z-axis direction and the y-axis direction. Determining a vehicle-based coordinate system by uniquely determining a direction as an x-axis direction that is a direction along the front-rear direction of the vehicle;
Using the origin position of the measuring instrument in the vehicle-based coordinate system and the three-dimensional position of the engine mount in the measuring instrument-based coordinate system, the following coordinate transformation determinant

Calculating a three-dimensional position of the engine mount in the vehicle-based coordinate system;
An engine mount displacement measuring method comprising:

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