JP2012127842A - Displacement measurement device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a displacement measurement device for internal combustion engine, capable of easily and accurately measuring displacement of an internal combustion engine mounted on a vehicle.SOLUTION: A displacement measurement device for internal combustion engine is provided with displacement amount calculation means for calculating a displacement amount of an internal combustion engine based on the measurement results of a first object to be measured and a second object to be measured by displacement measurement means. The displacement amount calculation means obtains intersections P(X, Z), P'(X', Z') of extended lines of first linear parts l1, l'1 formed by including measurement points by the displacement measurement means on a first measurement surface of the first object to be measured and extended lines of second linear parts m1, m'1 formed by including measurement points by the displacement measurement means on a second measurement surface of the second object to be measured, respectively. The displacement amount of the internal combustion engine is calculated by computing displacement of the intersections on a reference plane formed by the first linear parts and the second linear parts of the intersections.

Description

  The present invention relates to a displacement measuring apparatus for an internal combustion engine, and relates to a technique for measuring a displacement amount of an internal combustion engine mounted on a vehicle.

It is important to grasp how much the engine (internal combustion engine) mounted on the vehicle is displaced in the engine room and how much it is displaced, for example, in designing a component layout in the engine room.
As a method for measuring the displacement amount of the engine, there is widely known a method in which a pen is attached to a jig fixed to the engine and the locus of the tip of the pen is measured with a pressure sensitive paper provided on the vehicle body side.

Recently, a technique has also been developed in which the displacement of the engine is directly digitally processed by directly following the observation point set in the engine.
On the other hand, it is also known to use a laser displacement meter as a method of measuring the amount of displacement, for example, measuring the displacement of a sphere at both ends of a bolt arranged as a mount shaft of an engine mount with a laser displacement meter, A technique for making it possible to calculate the triaxial translation amount and biaxial rotation amount of the mount shaft with high accuracy is known (Patent Document 1).

JP 2010-169451 A

The conventional method of measuring the locus of the tip of the pen with a pressure-sensitive paper or the like has a problem that it takes time for measurement and cannot be performed quickly.
In addition, the method for obtaining the displacement amount of the engine directly by digital processing has a problem that the theory and arithmetic processing are complicated and impractical.
Moreover, in the technique disclosed in Patent Document 1, the attitude of the mount shaft of the engine mount is measured, and the displacement amount of the engine is not directly measured.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a displacement measuring device for an internal combustion engine that can easily and accurately measure the amount of displacement of the internal combustion engine mounted on the vehicle. Is to provide.

  In order to achieve the above object, a displacement measuring device for an internal combustion engine according to claim 1 is provided on the vehicle body side in the displacement measuring device for an internal combustion engine for measuring the displacement of the internal combustion engine with respect to the vehicle body, and measures the displacement of the measured object. Displacement measuring means, a first object to be measured having a first measurement surface, a first measurement surface, a second measurement surface, and a first measurement surface, the first measurement surface, and the first measurement surface. Measurement of the first measured object and the second measured object by the displacement measuring means, and a second measured object provided at the internal combustion engine or a portion interlocked with the internal combustion engine so that two measurement surfaces intersect Displacement amount calculating means for calculating the displacement amount of the internal combustion engine based on the result, wherein the displacement amount calculating means sets the measurement point by the displacement measuring means on the first measurement surface of the first measured object. The extension of the first straight portion formed to include An intersection of a line and an extension line of a second straight line portion formed on the second measurement surface of the second object to be measured including the measurement point by the displacement measuring means is obtained, and the first straight line portion of the intersection point is obtained. And a displacement amount of the internal combustion engine is calculated by calculating a displacement on a reference plane formed by the second linear portion.

  The internal combustion engine displacement measurement apparatus according to claim 2 is the internal combustion engine displacement measurement device according to claim 1, wherein the first measurement surface and the second measurement surface are flat surfaces, and the displacement amount calculation means is configured to perform the first measurement by the displacement measurement means. Measuring two points on the plane of the measurement surface to form the first straight line portion, measuring two points on the plane of the second measurement surface by the displacement measuring means to form the second straight line portion; The intersection point is obtained.

A displacement measuring apparatus for an internal combustion engine according to claim 3, wherein the displacement measuring means is a laser displacement meter that measures displacement by irradiating the measured object with a laser, the laser displacement meter The laser irradiating part is located on the reference plane.
A displacement measuring apparatus for an internal combustion engine according to a fourth aspect is characterized in that in any one of the first to third aspects, the reference plane is perpendicular to a crankshaft of the internal combustion engine.

  In a displacement measuring apparatus for an internal combustion engine according to a fifth aspect, in any one of the first to fourth aspects, the displacement amount calculating means forms an imaginary straight line obtained by translating the first straight line portion within the reference plane. A virtual intersection where the virtual straight line and the second straight line intersect is obtained, and a roll center point of the internal combustion engine on the reference plane is calculated from each displacement of the intersection and the virtual intersection.

  A displacement measuring apparatus for an internal combustion engine according to claim 6 is the displacement measurement device for internal combustion engine according to claim 5, wherein the internal combustion engine or a portion interlocked with the internal combustion engine is provided with a third measurement object having a third measurement surface, and a fourth measurement surface. And the third measurement surface and a fourth device to be measured provided at a portion interlocked with the internal combustion engine such that the third measurement surface and the fourth measurement surface intersect, An extension line of a third straight line portion formed on the third measurement surface of the third object to be measured including the measurement point by the displacement measuring means, and the fourth measurement surface of the fourth object to be measured on the fourth measurement surface. The second intersection point with the extended line of the fourth straight line portion formed including the measurement point by the displacement measuring means is obtained, and the reference formed by the third straight line portion and the fourth straight line portion of the second intersection point By calculating the displacement on the second reference plane parallel to the plane, A displacement amount of the combustion engine is calculated, a second imaginary straight line is formed by translating the third straight line portion in the reference plane, and the second imaginary straight line intersects the fourth straight line portion. A virtual intersection is obtained, a second roll center point of the internal combustion engine on the second reference plane is calculated from each displacement of the second intersection and the second virtual intersection, and the roll center point on the reference plane and the second The roll axis of the internal combustion engine is calculated based on the second roll center point on the reference plane.

  According to a seventh aspect of the present invention, in the internal combustion engine displacement measuring apparatus according to any one of the first to sixth aspects, the extension line of the first straight line portion and the extension line of the second straight line portion intersect at a right angle. A measured object and the second measured object are arranged.

  According to the displacement measuring apparatus for an internal combustion engine of the first aspect of the present invention, the displacement amount calculating means for calculating the displacement amount of the internal combustion engine based on the measurement results of the first measured body and the second measured body by the displacement measuring means. The displacement amount calculating means includes an extension line of the first straight line portion that includes a measurement point by the displacement measuring means on the first measurement surface of the first object to be measured and a second line of the second object to be measured. An intersection with the extended line of the second linear portion formed including the measurement point by the displacement measuring means on the measurement surface is obtained, and on a reference plane formed by the first linear portion and the second linear portion of the intersection The amount of displacement of the internal combustion engine is calculated by calculating the displacement.

As a result, it is difficult to obtain the amount of displacement of the internal combustion engine by one-dimensionally grasping one point of the internal combustion engine with the displacement measuring means, but it is an extension of the two lines of the first straight line portion and the second straight line portion. By calculating the intersection of the two, the displacement amount of the internal combustion engine can be calculated two-dimensionally and easily and accurately.
According to the displacement measuring apparatus for an internal combustion engine of claim 2, the first measurement surface and the second measurement surface each form a flat surface, and the displacement amount calculation means has two points on the plane of the first measurement surface by the displacement measurement means. Is measured to form a first straight line portion, and two points on the plane of the second measurement surface are measured by the displacement measuring means to form a second straight line portion to obtain an intersection.

As a result, the measurement points by the displacement measuring means of the internal combustion engine or the portion interlocked with the internal combustion engine are displaced due to the displacement of the internal combustion engine. However, the first measurement surface and the second measurement surface are set to be flat surfaces, respectively. By measuring two points on the plane and two points on the plane of the second measurement surface, the first straight line portion and the second straight line portion can be formed satisfactorily, and the intersection can be obtained.
According to the displacement measuring apparatus for an internal combustion engine of claim 3, the displacement measuring means is a laser displacement meter that measures the displacement by irradiating the measurement object with a laser, and the laser irradiation portion of the laser displacement meter is on the reference plane. Therefore, when measuring displacement using a laser displacement meter, performing laser irradiation within the reference plane can reduce measurement errors caused by the irradiation laser being displaced in a direction perpendicular to the reference plane. it can.

According to the displacement measuring apparatus of the internal combustion engine of the fourth aspect, the reference plane is perpendicular to the crankshaft of the internal combustion engine, so that the displacement of the internal combustion engine around the crankshaft can be calculated more accurately.
According to the displacement measuring apparatus for an internal combustion engine of claim 5, the displacement amount calculating means forms a virtual straight line obtained by translating the first straight line portion in the reference plane, and the virtual straight line and the second straight line portion are The intersecting virtual intersection is obtained, and the roll center point of the internal combustion engine on the reference plane is calculated from the intersection and each displacement of the virtual intersection.

As a result, the intersection and the virtual intersection are obtained based on the first straight line portion and the second straight line portion, and the virtual straight line and the second straight line portion, respectively, and the roll center point is easily calculated based on the displacements of these intersection points and virtual intersection points. can do.
According to the displacement measuring apparatus for an internal combustion engine of claim 6, the displacement amount calculating means is an extension of the third straight line portion formed on the third measurement surface of the third object to be measured, including the measurement points by the displacement measuring means. A second intersection point between the line and the extended line of the fourth straight line portion formed including the measurement point by the displacement measuring means on the fourth measurement surface of the fourth object to be measured is obtained, and the reference plane of the second intersection point is obtained. A displacement amount of the internal combustion engine is calculated by calculating a displacement on the parallel second reference plane, and a second virtual straight line is formed by translating the third straight line portion in the reference plane. A second virtual intersection where the straight line and the fourth straight line intersect is obtained, a second roll center point of the internal combustion engine on the second reference plane is calculated from each displacement of the second intersection and the second virtual intersection, and the reference plane An internal combustion engine based on the roll center point in the second reference plane and the second roll center point in the second reference plane The roll axis so as to calculation.

Therefore, the roll axis can be easily obtained based on the roll center point of the reference plane and the roll center point of the second reference plane, and the maximum displacement amount of the internal combustion engine can be grasped in three dimensions.
Thereby, by simulating the vibration of the internal combustion engine around the roll axis, the maximum displacement amount of the internal combustion engine in the engine room can be easily and accurately grasped, for example, the component layout in the engine room, It is possible to design efficiently while avoiding interference between components and the internal combustion engine.

  According to the internal combustion engine displacement measuring apparatus of the seventh aspect, the first measured body and the second measured body are arranged so that the extension line of the first straight line portion and the extension line of the second straight line portion intersect at a right angle. Therefore, the first straight line portion and the second straight line portion can be easily grasped by coordinates on the reference plane, and the calculation load can be reduced.

1 is a schematic diagram showing an overall configuration of a displacement measuring device for an internal combustion engine according to the present invention. It is a schematic diagram which shows the mode of the measurement of the displacement of the engine by a displacement meter. It is a figure which shows how to obtain | require the straight line l1, straight line l'1, straight line m1, straight line m'1, intersection P (X, Z), and intersection P '(X', Z '). It is a figure which shows how to obtain | require the straight line l2 and the straight line l'2. It is a figure which shows how to obtain | require measurement point Q (U, V), measurement point Q '(U', V '), engine roll center point O (a, b), and engine roll angle (theta).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing the overall configuration of a displacement measuring apparatus for an internal combustion engine according to the present invention.
Although not shown, the engine (internal combustion engine) 10 is disposed in an engine room of the vehicle. Specifically, the engine 10 has an engine mount on a vehicle body member (for example, a side member or a side frame) constituting the vehicle body. Connected through. Anti-vibration rubber is interposed in the engine mount, whereby the engine 10 is displaced and vibrated with respect to the vehicle body member, and the vibration of the engine 10 is absorbed and mitigated by the engine mount.

In the figure, the coordinate axes (X axis, Y axis, Z axis) are respectively the X axis in the longitudinal direction of the vehicle, the Y axis in the vehicle width direction and along the crank axis of the engine 10, and the Z axis in the vehicle height direction. The direction is shown. That is, here, the engine 10 is disposed in the engine room in a so-called horizontal state in which the crankshaft extends in the vehicle width direction.
The displacement measuring device includes a displacement measuring jig 20 and displacement meters (displacement measuring means) 30 and 32.

  As shown in the figure, the displacement measuring jig 20 includes a vertical member (first measured body, third measured body) 22 and a horizontal member (second measured body, fourth measured body) 24. A pair of L-shaped members that are rectangular and have an included angle of 90 ° (right angle) are connected to form a single body, and the horizontal member 24 is fixed by a fastening member via a bracket 26 so as to be along the upper surface of the engine 10. Is done. Specifically, the displacement measuring jig 20 is fixed to the upper surface of the engine 10 such that a pair of L-shaped members including the vertical member 22 and the horizontal member 24 are parallel to each other along the XZ plane.

  Displacement meters 30 and 32 are laser displacement meters, which are not shown, but are fixed to vehicle body members constituting the vehicle body. Specifically, the displacement meter 30 has sides facing the vertical member 22 and the horizontal member 24 of the displacement measuring jig 20, respectively, and these sides are separated in the direction along the vertical member 22 and the horizontal member 24. Each includes a pair of laser irradiation units 33 and 33 and a pair of laser irradiation units 35 and 35. Similarly, the displacement meter 32 has sides facing the vertical member 22 and the horizontal member 24, respectively, and a pair of laser irradiation units 34 are separated from each other in the direction along the vertical member 22 and the horizontal member 24. , 34 and a pair of laser irradiation parts 36, 36. The pair of laser irradiation units 34 and 34 and the pair of laser irradiation units 36 and 36 respectively radiate parallel laser beams perpendicularly to the vertical member 22 and the horizontal member 24 that are measured objects. The irradiation direction has been adjusted.

That is, two displacement meters 30 and 32 are provided in parallel in the XZ plane toward the vertical member 22 and the horizontal member 24 of the displacement measuring jig 20, respectively, in the longitudinal direction of the vehicle (X-axis direction). The two parallel lasers are respectively irradiated in the vehicle height direction (Z-axis direction).
Here, the displacement meters 30, 32, that is, the laser displacement meter used in the present invention will be described. The laser displacement meter cannot measure the distance to the measurement object, but measures the amount of displacement of the measurement object in the laser irradiation direction. Further, since the laser is irradiated only in a certain direction, it is impossible to measure following the same point on the measured object that is displaced three-dimensionally. However, if the object to be measured is linear and the two parallel lasers are irradiated perpendicularly to the linear part as in the above configuration, the displacement of the object to be measured can be grasped as a displacement of the line instead of a point. Further, if two laser displacement meters are installed as described above with respect to each object having two linear portions, two laser displacement meters are arranged so that the laser irradiation direction is on the same plane, 2 The displacement of the intersection of two straight lines can be calculated. Therefore, even a laser displacement meter that can originally measure only a one-dimensional displacement amount can calculate a two-dimensional displacement amount.

In the present invention, as described above, the object to be measured is composed of the vertical member 22 and the horizontal member 24 and has a rectangular cross section. Therefore, the displacement amount of the vertical laser irradiated to each member will be described in detail later. As shown in FIG. 2, it can simply be regarded as a one-dimensional displacement amount.
Further, here, a line (a straight line l 1 and a straight line l ′ 1 described later) connecting two irradiation points (measurement points) on the vertical member 22 of the laser irradiated from the displacement meters 30 and 32 and the horizontal member 24. Assuming a virtual surface formed from lines (straight line m1, straight line m′1 described later) connecting two irradiation points (measurement points), these are respectively shown as R planes (reference planes) for convenience as shown in FIG. , L plane (second reference plane).

Here, as described above, since the displacement meters 30 and 32 are configured to irradiate the laser in parallel along the XZ plane, both the R plane and the L plane are parallel to the XZ plane. In other words, since the Y axis extends in a direction along the crankshaft of the engine 10, both the R surface and the L surface are perpendicular to the crankshaft.
A pair of laser irradiation units 33 and 33 and a pair of laser irradiation units 35 and 35 are also positioned on the R plane, and a pair of laser irradiation units 34 and 34 and a pair of laser irradiation units 36 are positioned on the L plane. 36 are also located. That is, the displacement meters 30 and 32 are arranged so as to irradiate laser in the R plane and the L plane.

The electronic control unit 40 is an electronic control device including a CPU, a memory, and the like. The displacement meters 30 and 32 are electrically connected to the input side of the electronic control unit 40, and the measurement results of the displacement meters 30 and 32 are calculated. It is configured to process and output to a monitor or the like (not shown) (displacement amount calculation means).
Hereinafter, the operation of the displacement measuring apparatus for an internal combustion engine according to the present invention configured as described above, that is, the calculation processing contents of the electronic control unit 40 will be described.

Referring to FIG. 2, a state of measuring the displacement of the engine 10 on the R plane by the displacement meter 30 when the displacement measuring device is viewed in the Y-axis direction is schematically shown. In the figure, the left side shows a state when the engine 10 is stopped, and the right side shows a state when the engine 10 is operating. Although the R plane will be described here, the same applies to the L plane, and a description thereof will be omitted.
As shown in the figure, laser is emitted from the pair of laser irradiation units 33 and 33 and the pair of laser irradiation units 35 and 35 of the displacement meter 30 toward the vertical member 22 and the horizontal member 24, and Two axial displacements and two horizontal member 24 displacements in the Z-axis direction are measured.

Here, when the engine 10 is stopped, the coordinates of the points where the laser beams of the vertical member 22 and the horizontal member 24 are irradiated are respectively point A (x1, z1), point B (x2, z2) and point C (x3, z3). ), D point (x4, z4).
When the engine 10 is operated, the displacement amount from the displacement meter 30 that changes every moment to the vertical member 22 and the horizontal member 24 is measured, and the displacement of the engine 10 in the X-axis direction and the displacement in the Z-axis direction is measured. In this case, the coordinates on the vertical member 22 and the horizontal member 24 on the XZ plane are, for example, point A ′ (x1 + d1, z1), where d1, d2, d3, and d4 are displacement amounts (indicated by arrows). , B ′ point (x2 + d2, z2), C ′ point (x3, z3 + d3), and D ′ point (x4, z4 + d4).

  Based on the coordinates of the points A, B, C, and D thus obtained and the coordinates of the points A ′, B ′, C ′, and D ′, as shown in FIG. A straight line l1 (first straight line portion, third straight line portion) passing through the point is obtained, a straight line m1 (second straight line portion, fourth straight line portion) passing through the points C and D is obtained, and further, the points A ′ and B ′. A straight line l′ 1 (first straight line portion, third straight line portion) passing through is obtained, and a straight line m′1 (second straight line portion, fourth straight line portion) passing through the points C ′ and D ′ is obtained. The intersection P (X, Z) (intersection, second intersection) where the straight line l1 and the straight line m1 intersect, and the intersection P ′ (X ′, Z ′) where the straight line l′ 1 and the straight line m′1 intersect. (Intersection point, second intersection point) is obtained.

Here, since the vertical member 22 and the horizontal member 24 form a right angle, the straight line l 1 and the straight line m 1, the straight line l ′ 1 and the straight line m ′ 1 also form a right angle, the straight line l 1, the straight line m 1, and the straight line l ′ 1. The straight line m′1, the intersection point P (X, Z), and the intersection point P ′ (X ′, Z ′) are respectively expressed by the following equations (1) to (6).
l1: z−z1 = α (x−x1) (1)
l′ 1: z−z1 = α ′ {x− (x1 + d1)} (2)
m1: z−z3 = β (x−x3) (3)
m′1: z− (z3 + d3) = β ′ (x−x3) (4)
(X, Z) = ((z3−z1 + α · x1−β · x3 / (α−β),
z1 + α (X-x1)) (5)
(X ′, Z ′) = ({z 3 −z 1 + α ′ (x 1 + d 1) −β ′ (x 3 + d 3)} / (α′−β ′),
z1 + α ′ {X ′ − (x1 + d1)}) (6)
here,
α = (z2−z1) / (x2−x1), α ′ = (z2−z1) / (x2 + d2− (x1 + d1))
β = (z4−z3) / (x4−x3), β ′ = (z4 + d4− (z3 + d3)) / (x4−x3)
It is.

  As described above, in the displacement measuring apparatus for an internal combustion engine according to the present invention, the displacement meter 30 obtains the two coordinate points A, B, A ′ and B ′ on the vertical member 22 respectively to obtain the straight line l1. A straight line l′ 1 is set, two coordinate points C and D, C ′ and D ′ are obtained on the horizontal member 24, and a straight line m1 and a straight line m′1 are set. And an intersection P (X ', Z') between the straight line l'1 and the straight line m'1 is obtained. In this way, it is difficult for the laser emitted from the displacement meter 30 to inherently capture one point in a one-dimensional manner to determine the displacement amount of the engine 10, but the intersection point with respect to the intersection point P (X, Z). By detecting the displacement of P ′ (X ′, Z ′), the displacement amount of the engine 10 can be captured two-dimensionally and easily and accurately.

Once the intersection point P (X, Z) and the intersection point P ′ (X ′, Z ′) are determined, the engine roll is then used to know what vibration the engine 10 is making, ie, what kind of roll motion it is. A center point (roll center point, second roll center point) and an engine roll axis (roll axis) are obtained.
In order to obtain the engine roll center point, measurement points are required in addition to the intersection point P (X, Z) and the intersection point P ′ (X ′, Z ′). Therefore, here, the measurement point Q (U, V) when the engine 10 is stopped and the measurement point Q ′ (U ′, V ′) when the engine 10 is operating are obtained.

  In order to obtain the measurement point Q (U, V) and the measurement point Q ′ (U ′, V ′), as shown in FIG. 4, the straight line l 1 in FIG. A straight line l 2 and a straight line l ′ 2 (virtual straight line, second virtual straight line) obtained by translating the straight line l ′ 1 by the value ε and the value ε ′ in the X-axis direction are set (dashed line). That is, the straight line l2 and the straight line l'2 are set so as to always make the distance ε1 with respect to the straight line l1 and the straight line l'1.

Here, the straight line l2, the straight line l′ 2, the value ε, and the value ε ′ are respectively expressed by the following equations (7) to (10).
l2: z−z1 = α ′ (x + ε−x1) (7)
l′ 2: z−z1 = α ′ {x + ε ′ − (x1 + d1)} (8)
ε = ε1 // sinτ |, ε ′ = ε1 // sinτ ′ | (9)
Note that τ and τ ′ are angles formed by the straight lines l 1 and l ′ 1 and the X axis, respectively. Since tan τ = α, τ = arctan α and tan τ ′ = α ′. = Arctan α '.

From this, equation (9) can be rewritten as follows.
ε = ε1 // sin (arctanα) |, ε ′ = ε1 // sin (arctanα ') | (10)
The measurement points Q (U, V) and Q ′ (U ′, V ′) are the intersections (virtual intersections, second virtual intersections) of the straight line l2 and the straight line m1, and the straight line l′ 2 and the straight line m′1, respectively. ) Is obtained as in the following equations (11) and (12).
(U, V) = ({z3−z1 + α (x1−ε) −β · x3} / (α−β),
β (U−x3) + z3) (11)
(U ′, V ′) = ({z3 + d3−z1 + α ′ (x1 + d1−ε) −β ′ · x3} / (α′−β ′),
β ′ (U′−x3) + z3 + d3) (12)
When the measurement point Q (U, V) and the measurement point Q ′ (U ′, V ′) are obtained in this way, the intersection point P (X, Z), the intersection point P ′ (X ′, Z ′) and the measurement point are measured. Based on Q (U, V) and measurement point Q ′ (U ′, V ′), an engine roll center point O (a, b) is obtained.

As schematically shown in FIG. 5, the engine roll center point O (a, b) is a perpendicular bisector of a line connecting the intersection P (X, Z) and the intersection P ′ (X ′, Z ′). The intersection of the perpendicular bisector n2 of the line connecting n1, measurement point Q (U, V) and measurement point Q ′ (U ′, V ′) is obtained as in the following equations (13) to (15). In FIG. 5, the displacement amount of the engine 10 is emphasized for easy understanding.
n1: z = s1, x + t1 (13)
n2: z = s2 · x + t2 (14)
(A, b) = (− (t1−t2) / (s1−s2), s1 · a + t1) (15)
here,
s1 =-(X'-X) / (Z'-Z), s2 =-(U'-U) / (V'-V)
t1 = (X ′ ² −X ² + Z ′ ² −Z ² ) / 2 (Z′−Z)
^{t2 = (U '2 -U 2} + V' 2 -V 2) / 2 (V'-V)
It is.

When the engine roll center point O (a, b) on the R plane is thus obtained, the engine roll center point O ′ (a ′, b ′) on the L plane is similarly obtained.
When the engine roll center point O (a, b) and the engine roll center point O ′ (a ′, b ′) are connected by a straight line, this straight line becomes the engine roll axis.
Further, as shown in FIG. 5, a straight line (broken line) connecting the engine roll center point O (a, b) and the intersection point P (X, Z) about the R plane and the intersection point with the engine roll center point O (a, b). An angle formed by a straight line (broken line) connecting P ′ (X ′, Z ′) is an engine roll angle θ, which is expressed by the following equation (16). As is clear from the equation, the engine roll angle θ changes from moment to moment according to the displacement of the engine 10 and changes according to P ′ (X ′, Z ′).

θ = arcsin ({(X−a) (Z′−b) − (X′−a) (Zb)}
/ {(X−a) ² + (Z−b) ² }) · 180 / π (deg) (16)
In this case, the engine roll angle in the R plane is set as θR, and the L roll plane is also determined as θL based on the engine roll center point O ′ (a ′, b ′), and the engine roll angles θR and L in the R plane are calculated. An average value (θR + θL) / 2 with respect to the engine roll angle θL on the surface may be set as the engine roll angle θ.

  As described above, according to the displacement measuring apparatus for an internal combustion engine according to the present invention, the displacement gauges 30 and 32 each cause the displacement of the vertical member 22 in the X-axis direction by two points (points A and B, A ′). Measure the displacement of the horizontal member 24 in the Z-axis direction at two points (C and D points, C 'and D' points), and obtain a straight line l1 passing through the A and B points. , A straight line m1 passing through the points C and D, a straight line l′ 1 passing through the points A ′ and B ′, and a straight line m′1 passing through the points C ′ and D ′ are obtained. Since the intersection point P (X, Z) with the straight line m1 and the intersection point P '(X', Z ') between the straight line l'1 and the straight line m'1 are obtained, the intersection point with respect to the intersection point P (X, Z) Based on the displacement of P ′ (X ′, Z ′), the displacement of the engine 10 can be easily and accurately captured in two dimensions.

  At this time, when the engine 10 is displaced, the laser irradiation points (measurement points) on the vertical member 22 and the horizontal member 24 by the displacement meters 30 and 32 are shifted. Since the surfaces 23 and 25 to which the laser is irradiated are set as planes and two points on the plane are measured, the straight line l1, straight line l'1, straight line m1, and straight line m'1 are formed well. It is possible to determine the intersection point P (X, Z) and the intersection point P ′ (X ′, Z ′).

Further, since the displacement meters 30 and 32 are arranged so as to irradiate the laser in the R plane and the L plane, the measurement error due to the deviation of the irradiating laser in the direction perpendicular to the R and L planes. Can be reduced.
Then, a straight line l 2 and a straight line l ′ 2 parallel to the straight line l 1 and straight line l ′ 1 are set, and measurement points Q (U, V) other than the intersection point P (X, Z) and the intersection point P ′ (X ′, Z ′) are set. ) And the measurement point Q ′ (U ′, V ′), the intersection point P (X, Z), the intersection point P ′ (X ′, Z ′), the measurement point Q (U, V), and the measurement point Q Based on '(U', V '), the engine roll center point O (a, b) in the R plane and the engine roll center point O' (a ', b') in the L plane are easily obtained, and these engine rolls are obtained. The engine roll axis can be easily obtained from the center point O (a, b) and the engine roll center point O ′ (a ′, b ′).

Therefore, the maximum displacement amount of the engine 10 can be grasped in three dimensions based on the engine roll axis thus obtained.
Thereby, by simulating the displacement (vibration) of the engine 10 around the engine roll axis, the maximum displacement amount of the engine 10 in the engine room can be easily and accurately grasped. The component layout can be efficiently designed while avoiding interference between the component and the engine 10.

  By the way, since the vertical member 22 and the horizontal member 24 are formed at an included angle of 90 ° (right angle), the straight line l 1 and the straight line m 1, and the straight line l ′ 1 and the straight line m ′ 1 also form a right angle, and the straight line l 1 and the straight line, respectively. m1, the straight line l'1 and the straight line m'1 can be easily grasped on the X-Z plane (coordinates) on the R plane and the L plane, and the intersection point P (X, Z) and the intersection point P '(X' , Z ′), engine roll center point O (a, b), engine roll center point O ′ (a ′, b ′), and engine roll axis can be easily calculated, and the calculation load can be reduced. it can.

Although the description of the displacement measuring apparatus for an internal combustion engine according to the present invention has been completed above, the present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the vertical member 22 and the horizontal member 24 are configured at a sandwich angle of 90 ° (right angle), thereby reducing the calculation load as described above. The included angle is not necessarily 90 °, and even in this case, the present invention can be implemented satisfactorily.

  Moreover, in the said embodiment, although the displacement measuring jig | tool 20 is fixed to the engine 10, you may make it provide the displacement measuring jig | tool 20 in the site | part interlock | cooperated with the engine 10. FIG.

10 Engine (Internal combustion engine)
20 Displacement measuring jig 22 Vertical member (first measured object, third measured object)
24 horizontal members (second measured object, fourth measured object)
30, 32 Displacement meter (displacement measuring means)
33, 34, 35, 36 Laser irradiation unit 40 Electronic control unit (displacement amount calculation means)

Claims (7)

In the internal combustion engine displacement measuring device for measuring the displacement of the internal combustion engine relative to the vehicle body,
A displacement measuring means provided on the vehicle body side for measuring the displacement of the measured object;
A first object to be measured which is provided in the internal combustion engine or a portion interlocked with the internal combustion engine and has a first measurement surface;
A second object to be measured, which has a second measurement surface, and is provided in the internal combustion engine or a portion interlocked with the internal combustion engine so that the first measurement surface and the second measurement surface intersect with each other;
Displacement amount calculating means for calculating the displacement amount of the internal combustion engine based on the measurement results of the first measured object and the second measured object by the displacement measuring means,
The displacement amount calculation means includes an extension line of a first straight line portion that includes a measurement point by the displacement measurement means on the first measurement surface of the first measurement object, and the second measurement object. An intersection point of an extension line of the second straight line portion formed including the measurement point by the displacement measuring means on the second measurement surface is obtained, and formed by the first straight line portion and the second straight line portion of the intersection point. A displacement measuring device for an internal combustion engine, wherein a displacement amount of the internal combustion engine is calculated by calculating a displacement on a reference plane. The first measurement surface and the second measurement surface each form a plane,
The displacement calculation means measures the two points on the plane of the first measurement surface by the displacement measurement means to form the first straight line portion, and the displacement measurement means on the plane of the second measurement surface. The displacement measuring apparatus for an internal combustion engine according to claim 1, wherein two points are measured to form the second straight line portion, and the intersection is obtained.   The displacement measuring means is a laser displacement meter that measures displacement by irradiating the object to be measured with a laser, and a laser irradiation unit of the laser displacement meter is located on the reference plane. Item 3. The displacement measuring device for an internal combustion engine according to Item 1 or 2.   The internal combustion engine displacement measuring apparatus according to any one of claims 1 to 3, wherein the reference plane is perpendicular to a crankshaft of the internal combustion engine.   The displacement amount calculating means forms a virtual straight line obtained by translating the first straight line portion in the reference plane, obtains a virtual intersection where the virtual straight line and the second straight line intersect, and 5. A displacement measuring apparatus for an internal combustion engine according to claim 1, wherein a roll center point of the internal combustion engine on the reference plane is calculated from each displacement of the virtual intersection. A third object to be measured which is provided in the internal combustion engine or a portion interlocked with the internal combustion engine and has a third measurement surface;
A fourth measurement surface, and a fourth measurement object provided at a portion interlocked with the internal combustion engine or the internal combustion engine so that the third measurement surface and the fourth measurement surface intersect with each other,
The displacement amount calculating means includes:
An extension line of a third straight line portion formed on the third measurement surface of the third object to be measured including the measurement point by the displacement measuring means, and the fourth measurement surface of the fourth object to be measured on the fourth measurement surface. The second intersection point with the extended line of the fourth straight line portion formed including the measurement point by the displacement measuring means is obtained, and the reference formed by the third straight line portion and the fourth straight line portion of the second intersection point A displacement amount of the internal combustion engine is calculated by calculating a displacement on a second reference plane parallel to the plane;
Forming a second virtual straight line obtained by translating the third straight line portion in the reference plane, obtaining a second virtual intersection where the second virtual line and the fourth straight line intersect, and obtaining the second intersection And a second roll center point of the internal combustion engine on the second reference plane from each displacement of the second virtual intersection point,
6. The displacement measuring apparatus for an internal combustion engine according to claim 5, wherein a roll axis of the internal combustion engine is calculated based on a roll center point on the reference plane and a second roll center point on the second reference plane.   The first measured object and the second measured object are arranged so that an extension line of the first straight line portion and an extension line of the second straight line portion intersect at a right angle. The displacement measuring device for an internal combustion engine according to any one of claims 1 to 6.

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