JP6127887B2 - Engine suspension system evaluation system - Google Patents

Description

  The present invention relates to an engine suspension system evaluation apparatus that evaluates an engine suspension system against engine shake (body vibration amplified by resonance of the engine suspension system).

  As an engine suspension system evaluation device, for example, a device disclosed in Patent Document 1 (engine mount displacement measurement device) is known. In the apparatus of Patent Document 1, an engine mount is disposed on a body (that is, a gantry), and the engine mount and an engine bracket are connected by bolts, whereby the engine is mounted on the body via the engine mount. And three detection bodies are arrange | positioned at the end of the said volt | bolt. In the body vibration state, the three-dimensional coordinates of the detection body are measured by the stereo camera, and the three-axis acceleration of the bolt is measured by the acceleration pickup. Then, using these measurement results, the amount of displacement of the bolt in the camera coordinate system (that is, the amount of displacement of the engine mount) is measured. This measured value is used as an index value for engine suspension system evaluation.

JP 2010-169595 A

  In the apparatus of Patent Document 1, since the displacement amount of the engine mount is measured in the vibration state of the body (that is, the displacement amount of the engine mount includes the influence of the vibration of the body), the measured value includes the body inertia ( In other words, the inertia of the gantry) and the influence of the input from the suspension are included. Thus, if the measurement value includes the influence of the body inertia, the index value changes even if the input from the body inertia and the suspension is different (that is, the vehicle on which the engine is mounted is different) even in the same engine suspension system. The problem occurs.

  Therefore, the present invention has been made in view of the above problems, and obtains an index value for engine suspension system evaluation by excluding the influence of body inertia (ie, inertia of the gantry) and input from the suspension. An object of the present invention is to provide an engine suspension system evaluation device capable of performing

In order to solve the above-mentioned problems, an engine suspension system evaluation apparatus according to the present invention includes a gantry on which an engine can be installed via an engine mount, a displacement exciter that excites the gantry, and a displacement exciter. A load meter capable of measuring a load transmitted to the gantry, and the displacement excitation so as to excite engine suspension resonance in a state where the engine is installed on the gantry via the engine mount. The measured value of the load cell when the platform is displaced and excited by a device is converted into frequency axis data to obtain a “measured value in the presence of the engine”, and the engine mount and the engine are attached to the platform. in a state of not being established, the measured value of the load meter in the case of giving vibration similar displacement pressure and upon obtaining a "measure of the engine there state" to the frame by the displacement vibrator, peripheral Converted to data of several axes to obtain a “measured value without engine”, and a value for each frequency obtained by subtracting the “measured value without engine” from the “measured value with engine”, or The value for each frequency obtained by dividing the “measured value with engine” by the “measured value without engine” is the influence of the inertia of the gantry out of the influence of the inertia of the gantry and the resonance of the engine suspension system. By obtaining an index value for evaluating the removed engine suspension system and comparing this index value with a predetermined reference value, the engine suspension system is improved against body vibration amplified by the engine suspension system resonance. / Defect evaluation is performed .

According to said structure, since the load meter which can measure the load transmitted to a mount frame from a displacement shaker is provided, the transmission from an engine to a mount frame by engine suspension system resonance can be measured as a measured value of a load meter. And the measured value of the load meter ( measured value in the engine presence state) when the mount is displaced and excited by the displacement shaker while the engine is installed on the mount through the engine mount, the engine mount and the engine To evaluate the engine suspension system based on the difference or quotient from the measured value of the load cell ( measured value without the engine) when the frame is displaced and excited by the displacement shaker when it is not installed on the frame Since the index value is obtained, the index value for engine suspension system evaluation can be obtained by excluding the influence of the inertia of the gantry and the input from the suspension.

  In the engine suspension system evaluation apparatus of the present invention, the gantry is a vehicle body.

  According to the above configuration, since the gantry is the body of the vehicle, the index value can be obtained in consideration of the actual installation state of the engine.

  According to the engine suspension system evaluation apparatus of the present invention, an index value for engine suspension system evaluation can be obtained by excluding the influence of body inertia (ie, inertia of the gantry) and input from the suspension.

1 is a schematic configuration diagram of an engine suspension system evaluation device according to a first embodiment of the present invention in a state where an engine is present. 1 is a schematic configuration diagram of an engine suspension system evaluation device according to a first embodiment of the present invention in a state without an engine. It is the figure which showed an example of the index value for engine suspension system evaluation measured with the engine suspension system evaluation apparatus which concerns on 1st Embodiment of this invention. It is the structure schematic of the engine presence state of the engine suspension system evaluation apparatus which concerns on 2nd Embodiment of this invention. It is the structure schematic of the load meter used with the engine suspension system evaluation apparatus which concerns on 2nd Embodiment of this invention. It is a composition schematic figure of an engine absence state of an engine suspension system evaluation device concerning a 2nd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
<Description of configuration>
An engine suspension system evaluation apparatus according to this embodiment is a body that amplifies an engine shake (respectively referred to as an engine suspension system) and characteristics of an engine mount that suspends an engine such as an automobile and a body by resonance of the engine suspension system. It is a device to be evaluated under (vibration). As shown in FIG. 1, the engine suspension system evaluation apparatus 1 includes a gantry 7 on which an engine 5 can be installed via an engine mount 3, a displacement exciter 9 that excites the gantry 7, and a displacement exciter. 9 includes a load meter 11 capable of measuring a load transmitted from 9 to the gantry 7 and an arithmetic device 13 for calculating an index value for evaluating the engine suspension system from the measured value of the load meter 11.

  The gantry 7 is formed of a member having sufficient rigidity, and is installed so as to be movable up and down with respect to the ground A. Here, the gantry 7 includes a pedestal portion 7a on which the engine 5 can be installed via the engine mount 3, a plurality of leg portions 7b disposed on the lower surface of the pedestal portion 7a and supporting the pedestal portion 7a, and the ground A. And a plurality of cylindrical members 7c that are vertically installed and into which the lower end side of the leg portion 7b can be inserted. The pedestal 7 can be moved up and down with respect to the ground A by arranging the leg portion 7 b so as to move up and down along the cylinder axis direction in the cylinder member 7 c.

  The displacement exciter 9 can vibrate the gantry 7 up and down with a predetermined displacement (for example, applying a sine wave vibration S). Here, the displacement vibrator 9 vibrates the gantry 7 up and down with a predetermined displacement by vibrating the lower surface of the base 7a up and down with a predetermined displacement.

  The load cell 11 is a load cell that converts a load into an electric signal, for example. The load cell 11 is disposed between the gantry 7 (here, the platform 7a) and the displacement exciter 9, for example. Here, the load meter 11 outputs, for example, load data in which the vertical axis is a load and the horizontal axis is time as a measurement value.

  The arithmetic unit 13 measures the measured value H1 of the load cell 11 when the gantry 7 is vibrated by the displacement exciter 9 in a state where the engine 5 is installed on the gantry 7 via the engine mount 3 (that is, when the engine is present). And a difference ΔH from the measured value H2 of the load cell 11 when the mount 7 is vibrated by the displacement exciter 9 (that is, without the engine) in a state where the engine mount 3 and the engine 5 are not installed on the mount 7 (= H1-H2) is calculated, and the calculated value ΔH is used as an index value for engine suspension system evaluation. When calculating the difference ΔH, the respective measured values H1, H2 are converted into frequency axis data to calculate the difference ΔH.

  When the gantry 7 is displaced and excited by the displacement exciter 9 in the presence of the engine, the engine suspension resonance is excited. The measured value H1 in the presence of the engine includes the gantry when the gantry 7 is displaced and excited. 7 and the influence of the engine shake (that is, the influence of the engine suspension system). On the other hand, the measured value H2 in the absence of the engine includes only the influence of the inertia of the gantry 7 when the gantry 7 is displaced and excited. Therefore, the difference ΔH between the measured value H1 in the presence of the engine and the measured value H2 in the absence of the engine is used as an index value for evaluating the engine suspension system, so that the influence of the inertia of the gantry 7 is removed and the engine suspension system resonance An index value that includes only the effects of. Then, by comparing the index value with the reference value, the quality of the engine suspension system against engine shake is evaluated.

<Description of operation>
Next, a procedure for obtaining an index value for engine suspension system evaluation using the engine suspension system evaluation apparatus 1 will be described.

  First, as shown in FIG. 1, the engine 5 is installed on the mount 7 via the engine mount 3. In this state, the shaker 9 vibrates up and down with a predetermined displacement for a predetermined time by the displacement vibrator 9, so that an engine shake is generated for a predetermined time. Then, the measurement value (i.e., the measurement value in a state where the engine is present) H1 of the load cell 11 is measured by the arithmetic device 13 during this period. Next, as shown in FIG. 2, when the engine mount 3 and the engine 5 are not installed on the gantry 7, the gantry 7 is moved by the displacement exciter 9 for a predetermined time (that is, the same displacement as in the engine-equipped state). ) And the measurement value (that is, the measurement value in the absence of the engine) H2 of the load cell 11 is measured by the arithmetic unit 13 during this period.

Then, the arithmetic device 13 converts the measured value H1 in the engine presence state and the measured value H2 in the engine absence state into frequency axis data. Then, as shown in FIG. 3, the arithmetic device 13 calculates a difference ΔH (= H1−H2) between the measured value H1 in the engine presence state and the measurement value H2 in the engine absence state after the conversion. The calculated value ΔH is an index value for engine suspension system evaluation. Then, for example, the index value and the reference value are compared to evaluate whether the engine suspension system is good or bad with respect to the engine shake.

<Main effects>
According to the engine suspension system evaluation apparatus 1 configured as described above, since the load meter 11 capable of measuring the load transmitted from the displacement vibrator 9 to the gantry 7 is provided, the engine suspension system using the displacement vibrator 9 The transmission force (that is, transmission from the engine 5 to the gantry 7 due to engine resonance) can be measured as a measurement value of the load meter 11. The measured value H1 of the load cell 11 when the mount 7 is vibrated by the displacement shaker 9 with the engine 5 installed on the mount 7 via the engine mount 3, and the engine mount 3 and the engine 5 are In order to evaluate the engine suspension system based on the difference ΔH (= H1−H2) from the measured value H2 of the load cell 11 when the gantry 7 is vibrated by the displacement exciter 9 in a state where the gantry 7 is not installed. Therefore, the index value for engine suspension system evaluation can be obtained without the influence of the inertia of the gantry 7.

Second Embodiment
<Description of configuration>
In the engine suspension system evaluation apparatus 1 </ b> B according to this embodiment, for example, as shown in FIG. 4, the body 14 a of the vehicle 14 is used as the gantry 7. That is, in this embodiment, when measuring the measured value H1 of the engine presence state, the engine 5 is installed in the engine room 14b of the body 14a via the engine mount 3 as shown in FIG. The engine 5 is mounted on the vehicle 14 as usual via the engine mount 3). The engine room 14 b of the body 14 a is disposed on the displacement shaker 17 via the load meter 15.

  In this embodiment, the front wheels (that is, the wheels on the engine room 14b side) of the vehicle 14 are removed for convenience of measurement, and the rear wheels (that is, the remaining wheels) 14c of the vehicle 14 are attached as they are. The engine shaker 17 vibrates up and down with a predetermined displacement (for example, sine wave vibration S is applied) by the displacement exciter 17, so that the body 14a is vibrated up and down with a predetermined displacement.

  As shown in FIG. 5, the load meter 15 includes a support member 15 a that supports the body 14 a and a load meter body 15 b that is interposed in the middle of the support member 15 a in the longitudinal direction.

  The support member 15a is configured by connecting a base end portion 15c and a tip end portion 15d by a ball joint 15e. The base end portion 15c includes a pedestal portion 15f and a first support portion 15g provided upright on the pedestal portion 15f, and a ball joint 15e is connected to an upper end of the first support portion 15g. The front end portion 15d is composed of, for example, a flat plate-like contact portion 15h that contacts the body 14a, and a second support portion 15i that supports the contact portion 15h from the lower side, and is provided at the lower end of the second support portion 15i. A ball joint 15e is connected. By connecting the ball joint 15e between the first support portion 15g and the second support portion 15i, the second support portion 15i can be inclined in any direction from the axial direction of the first support portion 15g. (That is, the contact portion 15h can be inclined in any direction).

  The load meter main body 15b is, for example, a load cell that converts a load into an electrical signal. The load meter body 15b is interposed in the middle of the first support portion 15g of the support member 15a. More specifically, the first support portion 15g is divided into an upper portion 15k and a lower portion 15m, and the load meter main body 15b is disposed between the upper portion 15k and the lower portion 15m. . Thus, the load cell main body 15b is disposed between the upper portion 15k and the lower portion 15m of the first support portion 15g, so that the lower portion 15m of the first support portion 15g is changed to the upper portion 15k. The transmitted load (and hence the load transmitted from the displacement vibrator 17 to the body 14a) can be measured.

  The load meter 15 is disposed on the displacement exciter 17 in a state where the contact portion 15h is in contact with an appropriate portion of the engine room 14b and supports the engine room 14b. In this state, as in the case of the first embodiment, the body 14a is displaced and excited at a predetermined displacement by the displacement vibrator 17 for a predetermined time. By this vibration, the engine room 14b is vibrated up and down in an arc shape around the rotation axis of the rear wheel 14c. At that time, the contact portion 15h can be inclined in an arbitrary direction by the ball joint 15e, and therefore the load of the body 14a is always applied to the load meter 15 vertically. And the measured value (namely, measured value of an engine presence state) H1 of the load meter 15 in the meantime is measured by the arithmetic unit 13.

  Then, as shown in FIG. 6, in a state where the engine mount 3 and the engine 5 are not installed on the body 14a, the body 14a is fixed for a predetermined time by the displacement vibrator 17 as in the case of the first embodiment. The measured value of the load meter 15 (that is, the measured value in the absence of the engine) H2 is measured by the arithmetic unit 13 during this period. Then, as in the case of the first embodiment, the arithmetic device 13 calculates a difference ΔH (= H1−H2) between the measured value H1 in the engine presence state and the measured value H2 in the engine absent state, and the calculated value ΔH Is the index value for engine suspension system evaluation.

<Main effects>
According to the engine suspension system evaluation apparatus 1B configured as described above, in addition to obtaining the same effects as those of the first embodiment, since the gantry 7 is the body 14a of the vehicle 14, the actual installation state of the engine 5 can be determined. In consideration of this, an index value for engine suspension system evaluation can be obtained.

<Third Embodiment>
In the first and second embodiments, the difference ΔH (H1−H2) between the measured value H1 in the engine presence state and the measured value H2 in the engine absence state is calculated as the index value. Instead, the engine presence state is calculated. The quotient (for example, H1 / H2) between the measured value H1 and the measured value H1 in the absence of the engine may be calculated.

  The present invention is most suitable for application to an engine suspension system evaluation apparatus that evaluates an engine suspension system against an engine shake of an automobile or the like.

1,1B Engine suspension system evaluation device 3 Engine mount 5 Engine 7 Mounting base 9, 17 Displacement exciter 11, 15 Load meter 14 Vehicle 14a Body H1 Measured value with engine H2 Measured value without engine ΔH Difference

Claims (2)

A stand on which the engine can be installed via an engine mount;
A displacement exciter for displacing the gantry;
A load cell capable of measuring a load transmitted from the displacement vibrator to the gantry;
With
Measurement of the load cell when the gantry is displaced and excited by the displacement vibrator so that engine suspension resonance is excited in a state where the engine is installed on the gantry via the engine mount the value is converted into data of the frequency axis with obtaining "measured values of the engine there state", a state in which the engine mount and the engine is not installed in the frame, the "measurement values of the engine there condition" the measured value of the load meter when obtained similar displacement excitation and if applied to said frame by said displacement vibrator, is converted into data of the frequency axis to obtain a "measure of state without engine" , A value for each frequency obtained by subtracting the “measured value in the absence of the engine” from the “measured value in the presence of the engine” or the “measured value in the presence of the engine” in the “without engine” state. The value of each frequency divided by value ", calculated as an index value for the influence of the inertia of the pedestal of the impact and influence of the engine mounting system resonances inertia assessing engine suspension system removed the frame, An engine suspension system evaluation device characterized in that the engine suspension system is evaluated for good / bad against body vibration amplified by the engine suspension system resonance by comparing the index value with a predetermined reference value. . The engine suspension system evaluation device according to claim 1,
The engine suspension system evaluation apparatus, wherein the mount is a vehicle body.

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