JPS616442A - Engine mount device - Google Patents

Abstract

PURPOSE:To lessen vibration of an engine transmitted to a car body by providing exciting means on an engine mount to input power opposite-phase to power input from an engine. CONSTITUTION:Engine mounts S1, S2 respectively comprise upper and lower rubber mounts 1, 2 and intermediate plate 3 interposed therebetween. Further, exciting means V is disposed between the lower rubber mount 2 and a car body B. The exciting means V comprises a hydraulic actuator 4 or a solenoid exciting device. A signal of rev count of an engine E is input to a controller. According to an output signal of the controller, the exciting means V is operated in the opposite phase to vibration from the engine E. The intermediate plate 3 is driven by operation of the exciting means V to cancell the vibration from the engine E.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine mount device for mounting an engine on a vehicle.

[Conventional technology]

Conventional engine mount devices are made of an elastic member such as rubber, and are designed to reduce the transmission of engine vibrations to the vehicle body by reducing the vibration transmission rate due to the elasticity of the elastic member.

[Problem that the invention seeks to solve]

By the way, in the case of such conventional engine mount devices, it is necessary to reduce the spring constant of the elastic member in order to reduce the vibration transmission rate, but if the spring constant is significantly reduced, shock and engine-non-displacement may occur. , the spring constant cannot be significantly reduced,
The problem is that there is a limit to the amount of vibration reduction.

The present invention aims to solve these problems, and provides an engine mount device that can reduce the vibration transmission rate to the vehicle body while increasing the spring constant of the elastic body in the engine mount device. I confess that I will provide the following.

[Means for solving problems]

For this reason, the engine mount device of the present invention includes a mount mechanism that is interposed between the engine and the vehicle body to support the engine in a vehicle, and in order to prevent vibrations in the engine from being transmitted to the vehicle body. The present invention is characterized in that: 1, an excitation means for inputting a force of opposite phase to the force input from the engine to the mount mechanism into the mount mechanism is connected to the mount mechanism;

[Effect]

With the above configuration, the vibration force input from the engine to the mount mechanism is canceled, and the amount of engine vibration transmitted to the vehicle body is reduced.

〔Example〕

Hereinafter, referring to the drawings 1) An embodiment of the present invention will be described. Figs. 1 to 10 show an engine mount device as an embodiment of the present invention, and Fig. 1 is a schematic diagram showing the overall configuration. , FIG. 2 is a block diagram showing the excitation means and controller, FIG. 3 is a schematic diagram showing a map in the microprocessor, FIG. 4 is a block diagram showing a modification of the excitation means, and fifth and sixth The figure is a schematic diagram modeling a case where a vehicle is equipped with an engine mount device, FIG. 7 is a graph showing the simulation results, and FIG. 8 is a schematic diagram showing the simulation model of FIG. 7. $9.
Figure 10 is a graph showing the characteristics.

As shown in Figures 1 and 2, an engine mount device is installed on the front side of the center member (hereinafter referred to as vehicle body B) of a front-wheel drive vehicle.
S, and an engine mount device S2 is installed on the rear side.

Engine E is mounted on engine mount devices S, S2.

The engine E is supported by the vehicle body B via engine mount devices S, S, and is supported in the longitudinal direction by a mission mount (not shown), resulting in a three-point support structure.・Ru.

The mission mount is formed to have an extremely soft spring constant, and the engine mount device S...
It is designed not to adversely affect the operation of S2.

The weight of engine E is the engine mount device S,,S.

Sonoha is supported by Tonto.

The engine mount devices s, s2 have a north end fixed to the engine E, a one-part rubber mount 1, and a lower part installed in series through an intermediate plate 3 below the two-part rubber mount 1. It is composed of a rubber mount 2, a vibration means \i for driving the intermediate plate 3, and a controller C for controlling the vibration means V.

- The rubber mount 1 is made of hard rubber as a lower spring, and the lower rubber mount 2 is made of a soft comb as a front and rear spring.

The lower part 1, the mount 2 has a hole 2a or shape rI1 that penetrates vertically in the center. A rod 5 connected to a screw I/N of a hydraulic actuator 4 is inserted into the hole 2a.

The tip of the rod 5 is engaged with the intermediate plate 3, and the rod 5 and the intermediate plate 3 are driven up and down by the operation of the hydraulic actuator 4.

The lower rubber mount 2 is disposed so as to face in the shearing direction of the rubber or in the vertical direction because of the low 7-reaction force with the rod 5.

The hydraulic actuator 4 is driven by the configuration shown in FIG.

That is, the excitation module V that drives the hydraulic actuator 4 includes a girder valve 6, an oil cooler 7, a tank 8, a pump 9 driven by the engine E, a strainer 10, and a strainer 10, which are installed in the hydraulic actuator 1 (=I). It is composed of a hydraulic circuit formed by a check valve 1j and an accumulator 12, and the required hydraulic pressure is supplied to the hydraulic actuator 4 from the hydraulic circuit to cause the hydraulic actuator to perform the required operation. There is.

The operation of the servo valve 6 is controlled by a controller C.
7-ra 22 is connected to the servo valve 6, and the servo controller 22 receives a signal generated by the signal generator 21 according to the output signal of the micropro sensor 20, and the servo controller 22 generates the required excitation signal. The hydraulic actuator 4 performs an excitation operation according to the excitation signal.

The microprocessor 20 includes an engine pulse Ep generated by the operation of the engine E and an engine rotation speed sensor 2.
6I is detected, the waveform is shaped by the waveform shaping section 13, and FV converted by the FV conversion section 1G.

Furthermore, the signal is converted into a digital signal by an A/'D converter 17 and is inputted into the digital signal 9.

This digital signal sets the engine rotational speed in map 2 ('la (see FIG. 3) in the microprocessor 20).

In addition, a pressure sensor 14 is attached to the micropro sensor 20 to detect engine negative pressure.
The output signal of the G sensor 15, which is equipped to detect the displacement of the engine, is input via the converter 18, and the output signal of the G sensor 15, which is equipped to detect the displacement of the engine, is input via the A/'D converter 19. is input.

Based on the detection signals from the pressure sensor 4 and the G sensor 15, the position of the micropro sensor 20 in the vertical axis direction on the map 20a is set.

The map 20a includes a hydraulic actuator 4 corresponding to the engine rotation speed, engine negative pressure, and engine displacement acceleration.
In order to operate the hydraulic actuator 4, the gain and phase of the excitation signal input to the hydraulic actuator 4 are obtained through preliminary experiments and stored, and the positions of the vertical and horizontal axes are set as described above. As a result, an excitation signal with a key and phase corresponding to the operating state is transmitted to the signal generator 21. Servo controller 22. The signal is transmitted to the hydraulic actuator 4 via the servo valve 6. The excitation force of the hydraulic actuator 4 due to this excitation signal is transmitted from the engine E to the engine mount device S,...
The force is adjusted to have the opposite phase to the force input to S2.

The controller C of the vibration excitation means ＼7 is configured as a double series, and the force input from the engine E to the engine mount devices S, S2 is canceled by the opposite phase excitation force from the vibration means ■. This prevents vibrations from being transmitted from the engine E to the vehicle body B.

By the way, the means for driving the intermediate plates 3 of the engine mount devices S, S, may be formed as shown in FIG. The excitation current corresponding to the excitation signal is supplied to the electromagnetic exciter 25 under the control of a power amplifier 24 or a servo controller 22.

This causes the electromagnetic vibrator 25 to operate and drive the drive member 25a or the intermediate plate 3, thereby canceling the force input from the engine E to the engine mount devices S, S2.

Since the engine mount device of the present invention is configured as described above, when the engine E operates, the engine E vibrates, and the excitation force is transmitted to the engine mount device S IIS.
, and is transmitted to the intermediate plate 3 via the upper rubber mount 1.

At the time of this input, engine pulse Ep and engine E
The pressure sensor 14 detects the movement of the pressure sensor 14. The hydraulic actuator 4 is actuated by the G sensor 15, and an excitation force of the same magnitude and in the opposite phase to the excitation force transmitted from the engine E to the intermediate plate 3 acts on the intermediate plate 3.

As a result, from the engine E to the engine mount device S,
, the excitation force input to S2 is canceled, and the engine E
and vehicle body B are insulated from vibration.

By the way, the hydraulic actuator 4 is operated by the servo valve 6.
The servo valve 6 operated by the signal generator 21
．． A required excitation signal is input from the servo controller 22. Signal generator 21. The servo controller 22 has
Engine rotation speed calculated by engine pulse Ep,
Engine negative pressure and G detected by pressure sensor 14
The sensor 15 detects the acceleration due to the engine displacement detected by the servo valve 6. A/'D converter 17° A/D converter 18. The signal is input to the microprocessor 20 via the A/'D converter 19, and a required value is detected by the map 20a of the microprocessor/processor 20 and input.

Based on the input value inputted, the signal generator 21. An excitation signal having a required gain and phase is output from the servo controller 22, and the opening plate 3 is excited by the hydraulic actuator 4 via the servo valve 6.

By the way, the fact that the vehicle body B, which transmits vibrations, can be insulated from the engine E by such means is explained by the following theory and simulation.

5 and 6 show models of the engine mount devices S, S2, and FIG. 5 shows a model for their translational motion.

That is, a lower rubber mount 2 with a spring constant and a hydraulic actuator 4 are provided in parallel between a vehicle body B having a width of 1□ and an engine E having a mass r1]1.

Assuming that the excitation force generated in the engine E is F, the excitation force applied by the hydraulic actuator 4 is P, the displacement of the waist engine E is x1, and the displacement of the vehicle body B is x2, the following equation holds true.

In order to find the conditions for reducing the vibration of vehicle body B to 0, x,
Substituting =0 into equation (2), P=kx, ...(3)
Substituting equation (3) into equation (1), ×1=-F/(ro11112)...(4)-', P
−' kF/(+n, 2) ...(
5) That is, by applying the excitation force P calculated by equation (5) to the hydraulic actuator 4, the displacement of the vehicle body B becomes 0, and the vehicle body B does not vibrate despite the vibrations of the engine E. .

Note that W indicates the circular frequency of the engine E.

Further, FIG. 6 shows a model for rotational vibration of the engine E.

The excitation moment generated in the engine E is T, the rotation angle of the engine E due to the excitation moment T is θ, the excitation force applied to the hydraulic actuator 41 in the engine mount device S1 is Pl, and the engine mount device S
2, the excitation force exerted by the hydraulic actuator 4 is P2, and the mass of the portion of the vehicle body B in front of the engine E is M.
l, the mass of the rear part is M2, the engine mount device S1
t<' of the lower rubber mount 2 at .

Assuming that the spring constant of the rubber mount 2 is 7, the length of the arm from the engine E to the engine mount device S is ρ2, and the moment of inertia of the engine E is .
) stands, (+j++<, (ρ, θ−X,) ρ, +, (ρ, θ
-X~)ρ.

In order to find the conditions to reduce the vibration of the middle one I3 to 0,
Substitute X, -11, X~=() into equations (6) to (8),
Find I-,, P 7, f', = K, ρ; θ = (K1ρ, T)/(tII' I)...
(9) r', = K7ρ5θ = (-, ρ=T)/(Ill”T)...(1(+)
That is, the excitation force 1? calculated by equations (0) and (10)? By applying l + P 2 to the hydraulic actuator 4, the displacement of the vehicle body B becomes 0, υ, and the vehicle body B does not vibrate regardless of the vibration of the engine E.

J: Description (7) P HP + + P 2 is the town pressure sensor 14 calculated from the engine pulse Ep. It can be calculated from the excitation force F and excitation moment T calculated from the engine negative pressure and displacement detected by the G sensor 15, and by operating the hydraulic actuator 4 based on these calculated values, the displacement x 2
-(', + l X 1= (1+X, =O is realized.

Next, based on this idea, a comparison will be made between a case where an excitation force is applied to cancel the vibration of the engine IE and a case where an excitation force is not applied.

Note that the following comparison is made for the case of translational vibration for simplicity, and the same result a can also be obtained for rotational vibration.

[1] When cancel force is not applied, x, = P(k
m2+I+")/Φ:I""(k-+02uI2)/(u+'bt+,+11211+"-k(h+,+
m2) l] ... (11) x2=Fk/Φ =Fk/l: u+2fm, m2+u2=k('n, +m
2)l]...(12)×1 determined by equation (11)
The vibration characteristic has the characteristic shown by the chain line in FIG.

[21 When applying a cancel force to equation (1), x, = 0. Substituting P=-kF/(+n, w2) gives 171. ';, +kx1=F k'F
/ (mv”)X, =IF −kF/(+n1u+:
)l/(k-m, u+勺--P/(+nv2)
” (13) The x1 vibration characteristic determined by equation (13) has the characteristic shown by the solid line in FIG.

As shown in Equation 1 (13) and Figure 7, by applying a canceling force, xl and x2 are completely separated vibrationally, and the engine E, which corresponds to x1, behaves as a mass. As a result, the force transmitted from the engine E to the vehicle body B corresponding to x2 is canceled and the excitation force is always 0.

Next, the results of analyzing the system shown in FIGS. 1 and 2 through a computer simulation are shown below.

Figure 8 shows the model assumed in the simulation, in which engine E is attached via a spring to the tip of vehicle body B as a continuum, and an excitation moment T acts on engine E. .

Figure 9 shows the characteristics of engine E-side vibration according to the above model. In the figure, the two-dot chain line is when there is no canceling force, and the solid line is when there is canceling force and the balance rate is 90%. , the dashed line indicates the mass line.

In addition, Figure 10 shows the vibration damping characteristics of the vehicle body B according to the above-mentioned model, in which the two-dot chain line indicates the case where there is no canceling force, and the solid line indicates the case where there is a canceling force and the balance rate is 90%. It shows.

No.! ] As shown in the figure, the vibration generated at resonance point a in the vibration system formed by the engine E and the vehicle body B is significantly reduced because the engine E and the vehicle body [3] are separated in terms of vibration.

Further, as shown in FIG. 10, the vibration of the vehicle body B is reduced over the entire frequency range.

〔Effect of the invention〕

As described in detail below, according to the engine mount device of the present invention, in a vehicle, a mount mechanism is provided between the engine and the vehicle body to support the engine, and vibrations in the engine are transmitted to the vehicle body. In order to prevent the transmission of The structure separates engine vibration from vehicle body vibration, and regardless of the magnitude of the spring constant of the elastic force of the engine mount mechanism,
There is an advantage in reducing car body vibration.

・1 Brief explanation of Figure irl Figures 1 to 10 show an engine mount device as an embodiment of the present invention. Figure 1 is a schematic diagram showing its overall configuration, and Figure 2 is its excitation means. and a block diagram showing the controller, Fig. 3 is a schematic diagram showing the manipulator in the micropro sensor, Fig. 4 is a block diagram showing a modification of the vibration excitation means, and Figs. 5 and 6 show the engine mount device on the vehicle. Figure 7 is a schematic diagram modeling the case where the equipment is installed, Figure 7 is a graph showing the simulation results, Figure 8 is a graph showing the simulation results.
The figure is a schematic diagram showing the simulation model in Figure 7.
9 and 10 are graphs showing the characteristics.

1..." two-part com mount, 2... lower rubber mount,
2a... Hole, 3... Intermediate plate, 4... Hydraulic actuator, 5... Rod, 6... Servo valve, 7... Oil cooler, 8... Tank, 9... Pump, 10... Strainer, 11・・Check valve, 12 ・・Accumulator, 13
...Waveform shaping section, 14..Pressure sensor,]5..G sensor, 16..FV conversion section, 17,18.19..A/D
Conversion unit, 20...Microprocessor, 20a...Map, 21...Signal generator, 22...Servo controller, 23...Battery, 24...Power amplifier, 25...
Electromagnetic vibrator, 25a... Drive member, 26... Engine rotation speed sensor, B... Insect body, C... Controller, E...
Engine, Ell...Engine Pulse, 5llS,...
・Engine mount device, ＼・′・・Vibration means.

Agent: Patent Attorney Yoshihiko Iinuma Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 θ Figure 7 Figure 8 Figure 9 FREQUENCY (Hz) Figure 10 FREQUENCY (H7)

Claims (2)

[Claims] (1) In a vehicle, a mount mechanism is provided between the engine and the vehicle body to support the engine, and input from the engine to the mount mechanism is provided in order to prevent vibrations from the engine from being transmitted to the vehicle body. An engine mount device, characterized in that a vibration means for inputting a force having a phase opposite to the force into the mount mechanism is connected to the mount mechanism. (2) In order to operate the excitation means according to the rotation speed of the engine, an engine rotation speed sensor that detects the rotation speed of the engine; The engine mount device according to claim 1, further comprising a controller for actuating the means.