JPH0771515A - Electronic control engine mount - Google Patents

Abstract

PURPOSE:To raise merchandise value and improve controllability of an electronic control engine mount by using inexpensive actuator. CONSTITUTION:A main fluid room 20 and an auxiliary fluid room charged with incompressive fluid are communicated with each other through an orifice 23. An opening 41a having the same configuration as the cross section of a groove 23b forming the orifice 23 is drilled in a piston 41 which is integratedly constructed with a movable coil 38 through a yoke 37 and the like. An ECU makes switching of the power supply for the movable coil 38 in response to the operating condition from OFF to ON as shown on the drawing. The movable coil 38 then is pulled downwards together with the piston 41 as resisting to the energy force of a spring 36. Thus the orifice 23 in the communicating condition until then is changed to the cutoff condition and a small spring constant is changed to a large spring constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control engine mount which is arranged between an engine and a vehicle body and whose damping characteristic can be arbitrarily changed according to a vibration state input from the engine, a driving state of the vehicle and the like. It is about.

[0002]

2. Description of the Related Art As is well known, an engine is mounted on a vehicle body through an engine mount to prevent vibration transmission from the engine to the vehicle body, or to cause engine shake (engine of engine) during sudden acceleration, sudden deceleration, starting or braking. (Sway) has been achieved. An example of this type of engine mount is an SAE (Society of Automotive Engine).
ers, Inc.) 840258 is known. This is equipped with a rotary solenoid valve at the orifice that connects the main liquid chamber and the sub liquid chamber of the liquid-sealed engine mount.By opening and closing this rotary solenoid valve, the spring constant and damping coefficient of the engine mount can be varied to achieve idle speed. We are trying to reduce the vibration and engine shake during the operation.

Further, the one described in JP-A-2-203001 is known. This one uses an electro-rheological fluid as the liquid for mounting the engine mount and changes the orifice length by utilizing the phenomenon that the viscosity of the electro-rheological fluid in the orifice can be increased or decreased depending on whether or not a current is applied to the orifice. It is intended to obtain ideal mount characteristics.

[0004]

Among the above-mentioned prior art documents, in the former case, a rotary solenoid valve is used as an actuator which is a component, and it is expensive.
In the latter case, there is a problem that the temperature characteristic of the electrorheological fluid is poor.

Therefore, the present invention has been made in order to solve such a problem, and an object thereof is to provide an electronically-controlled engine mount having high controllability and high commercial value by using an inexpensive actuator.

[0006]

An electronically controlled engine mount according to the present invention is an electronically controlled engine mount which is disposed between a vehicle body and an engine and has a cushioning member which is elastically deformed by input vibration. The fluid is enclosed,
A main liquid chamber whose volume is changed in response to elastic deformation of the buffer member, and a sub liquid chamber which communicates with the main liquid chamber via an orifice and whose volume is variable in response to the change in volume of the main liquid chamber, A valve body arranged in the passage of the incompressible fluid of the orifice; an actuator for driving the valve body; and a signal generation unit for generating a control signal to the actuator according to a driving state of the vehicle. It is equipped with.

[0007]

In the present invention, the passage of the orifice that communicates with the main liquid chamber and the sub liquid chamber in which the incompressible fluid is sealed is controlled by the valve body to open and close. This valve element is driven by the actuator by the control signal generated by the signal generating means according to the driving state of the vehicle. Therefore, the electronically controlled engine mount has a small spring constant when the orifice is fully opened and a large spring constant when the orifice is fully closed.

[0008]

EXAMPLES The present invention will be described below based on specific examples.

<First Embodiment> FIG. 1 is a schematic view showing the overall construction of an electronically controlled engine mount according to a first embodiment of the present invention. 2 and 3 are sectional views showing details of the engine mount in the electronically controlled engine mount according to the first embodiment of the present invention, and FIG.
8 is in the OFF state, and FIG. 3 shows the moving coil 38 in the ON state.

As shown in FIG. 1, the electronically controlled engine mount of this embodiment controls an engine mount 3 disposed between a stay 1a of a vehicle body 1 and a stay 2a of an engine 2 and the engine mount 3. An electronic control unit (hereinafter simply referred to as "ECU") 4, a rotation angle sensor 6 which is provided in the distributor 5 of the engine 2 and outputs a rotation angle signal Ne related to the rotation speed thereof, and a reference indicating a reference position of the crank angle. Reference position sensor 7 for outputting position signal G2, brake switch 8 and throttle sensor 9
Composed of. The rotation angle sensor 6 and the reference position sensor 7 are a kind of magnet pickup.

Next, the detailed structure of the engine mount 3 will be described.

As shown in FIGS. 2 and 3, the engine mount 3 is used with the lower end bolt 13 fastened to the vehicle body 1 side and the upper end bolt 12 fastened to the engine 2 side. The mount housing 14 of the engine mount 3 has a bottomed cylindrical shape that opens upward, and a disk-shaped diaphragm 15 and a lower partition wall 1 on an opening edge 14a bent to the outer peripheral side thereof.
6 and the upper partition 17 are arranged in a superposed state. On the upper partition wall 17, a cushioning member 18 formed by mutually coupling a ring-shaped lower bracket 18a, a dome-shaped rubber elastic body 18b, and a disc-shaped upper bracket 18c is arranged. The diaphragm 15, the upper partition wall 16, and the lower partition wall 17 are fastened together to the lower bracket 18a of the mount housing 14 at the opening edge 14 thereof.
a is fixed by a plurality of bolts 19. The O-ring 16 is provided between the lower partition 16 and the upper partition 17 and between the upper partition 17 and the lower bracket 18a.
Liquid tightness is maintained by a and 17a.

With the above structure, the main liquid chamber 20 is provided between the buffer member 18 and the upper partition wall 17, the sub liquid chamber 21 is allowed to change its volume by the diaphragm 15 between the lower partition wall 16 and the diaphragm 15, and further. Air chambers 22 open to the atmosphere are formed between the diaphragm 15 and the mount housing 14, respectively. The upper partition 17 has a vertical upper hole 2
3a, the lower partition 16 has a horizontal groove 23b and a vertical lower hole 23c, and the upper hole 23a is formed in the main liquid chamber 20.
It is opened inside and is opened to the sub-liquid chamber 21 of the lower hole 23c. The orifice 2 that connects the main liquid chamber 20 and the sub liquid chamber 21 with each other through the upper hole 23a, the groove 23b, and the lower hole 23c.
3 is formed, and as will be described later, this orifice 23 is particularly provided in the engine mount 3 in a low frequency range (20 to 40H).
The cross-sectional area and length of the orifice 23 are set so that a damping action is exerted when the vibration of z) is input.

A convex portion 24 penetrating the elastic body 18b is formed in the center of the lower surface of the upper bracket 18c of the cushioning member 18, and the injection hole 24a formed in the convex portion 24 is located above the upper bracket 18c and the main liquid. It communicates with the inside of the chamber 20. The injection hole 24a is used for injecting an incompressible fluid such as ethylene glycol, which is a filling liquid, into the main liquid chamber 20 and the sub liquid chamber 21, and is normally closed by a bolt 25 from above. A disc-shaped stay 26 is fixed on the upper bracket 18c by a plurality of screws 27, and the stay 2
A bolt 12 fixed to the engine 2 side is integrally formed at the center of the upper surface of 6. The cylindrical piston 41 forming the valve body is fastened together with the diaphragm 15 and the yoke 37 by a plurality of screws 42, and an opening 41a having the same shape as the groove 23b cross section is formed.
Further, the cylindrical piston 41 is fitted with the upper partition 17 and the lower partition 16 and is slidable.

A first magnetic body 31 is fixed to the bottom of the mount housing 14 together with the mount housing 14 by bolts 13. A ring-shaped permanent magnet 33 is bonded onto the first magnetic body 31, and a ring-shaped second magnetic body 34 is bonded onto the permanent magnet 33. The permanent magnet 33 is an inexpensive ferrite magnet. The inner circumference of the second magnetic body 34 opposes the outer circumference of the cylindrical portion 31b of the first magnetic body 31 at a predetermined interval. Further, the yoke 37 has a bottomed cylindrical shape that opens downward, and the movable coil 38 that constitutes an actuator disposed below the yoke 37 has a cylindrical portion 31 b of the first magnetic body 31.
The movable coil 38 is located between the outer circumference and the inner circumference of the second magnetic body 34, and the movable coil 38 forms a so-called voice coil. A guide rod 43 is provided at the center of the lower surface of the yoke 37, and the guide rod 43 is reciprocally inserted in a guide hole 44 formed in the cylindrical portion 31b of the first magnetic body 31. Grooves 37a and 31a for guiding the spring 36 are provided on the lower surface of the yoke 37 and the upper surface of the cylindrical portion 31b of the first magnetic body, respectively.
The spring 36 is biased in a direction to push the yoke 37 upward. Therefore, the piston 41 has the upper partition 1
It is in a state of being pressed against 7.

FIG. 4 is a characteristic diagram showing the spring constant (N / mm) with respect to the frequency f (Hz) of the electronically controlled engine mount according to the first embodiment of the present invention. 4A is a characteristic diagram when the power of the movable coil 38 is OFF, and FIG. 4B is a characteristic diagram when the power of the movable coil 38 is ON. The ECU 4 that achieves the signal generating means generates an ON / OFF signal as a power source for the movable coil 38 of the engine mount 3 based on signals from the rotation angle sensor 6, the reference position sensor 7, the brake switch 8, the throttle sensor 9, and the like. . Normally (when idle), the power of the moving coil 38 is turned off, and the piston 36 is moved by the spring 36.
1 is pushed upward, and the main liquid chamber 20 and the sub liquid chamber 21 are communicated with each other by the orifice 23 (valve fully opened). Therefore, the incompressible fluid reciprocates in the orifice 23, the spring constant becomes small in the idle region as shown in FIG. 4A, and the idle vibration is reduced. On the other hand, at the time of transition (during engine shake, running on a rough road, etc.), the power of the movable coil 38 is turned on, and the guide rod 43 projecting from the yoke 37 causes the guide rod 43 to project into the guide hole 44 of the first magnetic body 31.
While slidingly contacting the inside, the movable coil 38 is pulled downward by the force of the Fleming left-hand rule and guided by the guide rod 43, and the yoke 37 is pulled downward together with the piston 41 against the biasing force of the spring 36. The side wall of the piston 41 closes the groove 23b forming the orifice 23 (valve fully closed). For this reason, since the incompressible fluid cannot reciprocate in the orifice 23, the spring constant becomes large in the engine shake region as shown in FIG. 4B, and engine shake and the like are reduced.

As described above, the electronically controlled engine mount according to the first embodiment of the present invention is an electronically controlled engine mount having the cushioning member 18 disposed between the vehicle body 1 and the engine 2 and elastically deformed by the input vibration. The main liquid chamber 20 that is filled with an incompressible fluid and changes its volume in response to the elastic deformation of the buffer member 18 is communicated with the main liquid chamber 20 through the orifice 23, and the volume change of the main liquid chamber 20. In response to the above, the auxiliary liquid chamber 21 having a variable volume, the valve body including the piston 41 arranged in the passage of the incompressible fluid of the orifice 23, and the valve body are driven to fully open or fully close the orifice 23. The actuator includes the movable coil 38 and the signal generating means including the ECU 4 that generates a control signal to the actuator according to the driving state of the vehicle.

Therefore, the piston 41 causes the orifice 2 of the main liquid chamber 20 and the sub liquid chamber 21 to be controlled by the ON / OFF control of the power supply to the movable coil 38 of the ECU 4 according to the operating state of the vehicle.
The non-compressible fluid passage 3 is communicated or blocked. That is, the voice coil formed from the movable coil 38 can easily be designed with a large valve lift amount and consumes less power, and the permanent magnet 33 used is a ferrite magnet or the like that is mass-produced for audio. In addition, since the control is a two-step switching type, the control circuit is simple, and the electronic control engine mount of the present embodiment has the effects of being inexpensive and simple in configuration, and having good controllability.

<Second Embodiment> FIGS. 5 and 6 are sectional views showing details of an engine mount in an electronically controlled engine mount according to a second embodiment of the present invention. Note that FIG.
Shows the power supply of the movable coil 38 in the OFF state, and FIG. 6 shows the power supply of the movable coil 38 in the ON state. Also,
The same reference numerals and symbols are given to those having the same configurations or corresponding portions as those of the above-described embodiment, and detailed description thereof will be omitted.

The piston 41 is fixed to the yoke 37 with the diaphragm 15 sandwiched therebetween, and is fitted with the lower partition wall 16 so as to be reciprocally slidable. The lower partition 16 has a groove 16b for guiding the spring 36.
Is provided, and the groove 16b and the flange portion 4 of the piston 41 are provided.
The spring 36 is biased in a direction to push the piston 41 downward with respect to 1b. The lower end of the guide rod 43 protruding from the lower surface of the yoke 37 is attached to the bolt 13
It comes in contact with and serves as a downward stopper.

Here, the power source is turned on at normal time (idle time).
FF, the piston 41 is pushed downward by a spring 36, the orifice 23 is communicated, and the incompressible fluid freely reciprocates in the orifice 23, and the spring constant becomes small. Further, during a transition (during engine shake, running on a rough road, etc.), the power is turned on and the moving coil 38 is energized. Then, as shown in FIG. 6, a force acts upward on the movable coil 38 according to the Fleming's left-hand rule, and the yoke 37 is pushed up against the biasing force of the spring 36 together with the piston 41 while being guided by the guide rod 43. By blocking the groove 23b and blocking the movement of the incompressible fluid in the orifice 23, the spring constant increases.

In this embodiment, only the shape of the piston 41 and the moving direction thereof are different, and the same effect as that of the first embodiment can be obtained by controlling ON / OFF of the power supply to the movable coil 38.

<Third Embodiment> FIGS. 7 and 8 are sectional views showing details of an engine mount in an electronically controlled engine mount according to a third embodiment of the present invention. Note that FIG.
Shows the power supply of the movable coil 52 in the OFF state, and FIG. 8 shows the power supply of the movable coil 52 in the ON state. Also,
The same reference numerals and symbols are given to those having the same configurations or corresponding portions as those of the above-described embodiment, and detailed description thereof will be omitted.

At the bottom of the mount housing 14, there is a first
Magnetic body 53 is fixed to a plurality of screws by 51, and a ring-shaped ferrite magnet 54 is adhered to the upper surface.
On the ferrite magnet 54, a ring-shaped second
The magnetic material 55 is adhered. In addition, the second magnetic body 5
5, a supporting ring 56 is adhered in a positioned state, and a damper 46 made of a non-woven fabric and a butterfly damper 47 shown in FIG. 9 having a predetermined spring constant are arranged on the inner periphery of the supporting ring 56 at a predetermined interval vertically. It is provided to support the yoke 45. At this time, the butterfly damper 47 is urged in a direction to push the yoke 45 upward. The movable coil 52 provided under the yoke 45 is located between the outer circumference of the cylindrical portion 53 a of the first magnetic body 53 and the inner circumference of the second magnetic body 55. Further, the upper portion of the yoke 45 has a plurality of screws 4
It is fastened to the diaphragm 15 and the piston 41 together by 2. A guide rod 49 is provided at the center of the lower surface of the yoke 45.
Of the first magnetic body 53.
The bearing 50 is press-fitted in the center of the cylindrical portion 53a and is reciprocally inserted along the axis.

As shown in FIG. 7, the power is turned off during normal operation (idle time), and at this time, the yoke 45 is pushed up by the spring force of the butterfly damper 47, and the piston 45 Opening 4 formed in 41
1a communicates with the groove 23b of the orifice 23 so that the incompressible fluid can freely move inside the orifice 23. For this reason, the spring constant of the engine mount is reduced, and vibration during idling is reduced. Further, during a transition (during engine shake, traveling on a rough road, etc.), the power is turned on and the moving coil 52 is energized. Then, as shown in FIG. 8, a downward force is applied to the movable coil 52 by the Fleming's left-hand rule, and the guide rod 49 is slidably contacted in the bearing 50 and pushed down. The yoke 45 is the guide rod 4
It is pushed down against the spring force of the butterfly damper 47 together with the piston 41 until the lower end surface of 9 contacts the upper end surface of the bolt 13. Therefore, the opening 41a of the piston 41 and the groove 23b of the orifice 23 are blocked, and the movement of the incompressible fluid in the orifice 23 is blocked, so that the spring constant increases.

In this embodiment, only the shape of the movable coil 52 and the structure for urging the movable coil 52 are different, and ON / OFF control of the power source to the movable coil 52 has the same effect as the first embodiment.

<Fourth Embodiment> FIGS. 10 and 11 are sectional views showing details of an engine mount in an electronically controlled engine mount according to a fourth embodiment of the present invention. In addition,
FIG. 10 shows the case where the power supply of the movable coil 52 is OFF, and FIG. 11 shows the case where the power supply of the movable coil 52 is ON. Further, the same reference numerals and symbols are given to those having the same configurations or corresponding portions as those of the above-described embodiment, and detailed description thereof will be omitted.

The movable coil 52 provided under the yoke 45 has an outer periphery of the cylindrical portion 53a of the first magnetic body 53 and a second portion.
It is located between the inner circumference of the magnetic body 55 and. Further, the upper portion of the yoke 45 is fastened together with the diaphragm 15 and the opening / closing valve 61 corresponding to the piston 41 by a screw 62. A seal material 63 is baked on the lower side of the opening / closing valve 61. A guide rod 49 is projectingly provided at the center of the lower surface of the yoke 45, and the guide rod 49 is a bearing 50 press-fitted into the center of the cylindrical portion 53 a of the first magnetic body 53.
It is reciprocally inserted inside along the axis.

Then, as shown in FIG. 10, the power source is turned off at the normal time (at the time of idling), and at this time, the yoke 45 is pushed upward by the spring force of the butterfly damper 47. Since the valve 61 connects the orifice 23 to the fully opened state, the incompressible fluid can freely move inside the orifice 23. For this reason, the spring constant of the engine mount is reduced, and vibration during idling is reduced. Further, during a transition (during engine shake, traveling on a rough road, etc.), the power is turned on and the moving coil 52 is energized. Then, as shown in FIG. 11, a force acts downward on the movable coil 52 according to the Fleming's left-hand rule, and the guide rod 49 is slidably contacted in the bearing 50 and pushed down. Then, the yoke 45 is pushed down together with the opening / closing valve 61 against the spring force of the butterfly damper 47 until the lower end surface of the guide rod 49 contacts the upper end surface of the bolt 13. Therefore, the seal member 63 of the on-off valve 61 blocks the orifice 23 from the fully closed state, and the movement of the incompressible fluid in the orifice 23 is blocked, so that the spring constant increases.

In this embodiment, only the shape of the movable coil 52 and the structure for urging the movable coil 52 are different, and ON / OFF control of the power source to the movable coil 52 has the same effect as that of the first embodiment.

[0031]

As described above, in the electronic control engine mount of the present invention, the main liquid chamber and the sub liquid chamber in which the incompressible fluid is sealed are communicated with each other through the orifice, and the incompressible fluid in the orifice is connected. The valve element disposed in the passage of is driven by the actuator according to the operating state of the vehicle, and the orifice is fully opened or fully closed, thereby changing the spring constant between the vehicle body and the engine. The structure is simple and inexpensive, and the controllability is good.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an electronically controlled engine mount according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a power-off state of an engine mount in an electronically controlled engine mount according to a first embodiment of the present invention.
It is sectional drawing which shows the detail at the time of.

FIG. 3 is a sectional view showing details of the electronically controlled engine mount according to the first embodiment of the present invention when the engine mount is powered on.

FIG. 4 is a characteristic diagram showing a relationship between a frequency f and a spring constant in the electronically controlled engine mount according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a second embodiment of the electronic control engine mount according to the present invention, the engine mount power OFF
It is sectional drawing which shows the detail at the time of.

FIG. 6 is a sectional view showing details of the electronically controlled engine mount according to the second embodiment of the present invention when the engine mount is powered on.

FIG. 7 is a view showing a third embodiment of the electronic control engine mount according to the present invention, in which the power of the engine mount is turned off.
It is sectional drawing which shows the detail at the time of.

FIG. 8 is a cross-sectional view showing details of an electronically controlled engine mount according to a third embodiment of the present invention when the engine mount is powered on.

FIG. 9 is a plan view showing a butterfly damper used in an engine mount in an electronically controlled engine mount according to a third embodiment of the present invention.

FIG. 10 is a power source O of an engine mount in an electronically controlled engine mount according to a fourth embodiment of the present invention.
It is sectional drawing which shows the detail at the time of FF.

FIG. 11 is a power source O of an engine mount in an electronically controlled engine mount according to a fourth embodiment of the present invention.
It is sectional drawing which shows the detail at the time of N.

[Explanation of symbols]

 1 Vehicle Body 2 Engine 4 ECU (Signal Generation Means) 18 Buffer Member 20 Main Liquid Chamber 21 Sub Liquid Chamber 23 Orifice 38 Moving Coil (Actuator) 41 Piston (Valve)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akuji Mizutani 1-chome, Showa-cho, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor Toshiaki Aki 1-3-3 Ginza, Chuo-ku, Tokyo Kyo Inside San Denki Co., Ltd.

Claims (1)

[Claims] 1. An electronically controlled engine mount, which is arranged between a vehicle body and an engine and has a cushioning member that is elastically deformed by an input vibration, in which a non-compressible fluid is sealed and which responds to the elastic deformation of the cushioning member. A main liquid chamber whose volume changes, a sub liquid chamber which communicates with the main liquid chamber via an orifice, and which changes its volume in response to a change in the volume of the main liquid chamber, and a passage for the incompressible fluid in the orifice. Is installed in
A valve body that changes a spring constant between the vehicle body and the engine by opening or closing the valve body, an actuator that drives the valve body, and a signal generation that generates a control signal to the actuator according to a driving state of the vehicle. An electronically-controlled engine mount comprising: