JPS60121116A - Supporting method of preventing production of vibration for car internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve riding sensation and quietness, by a method wherein, when vibration under the spring of a car body suspension device exceeds a given value, the constant of the dynamic spring of a variable control type vibration absorbing rubber device is increased. CONSTITUTION:A signal for vibration under the spring of a car body suspension device and a car speed signal are inputted to a controller 34 from a vibration sensor 35 and a car speed sensor 36, respectively. When the level of the vibration signal 35 exceeds a given level and a car speed exceeds a given value, an electromagnetic coil 32 of a variable control type vibration absorbing rubber device, not shown, is energized. Further, the valve of the variable control type vibration absorbing rubber device, not shown, is closed and the constant of a dynamic spring is increased, and vibration of high amplitude produced along with running of a vehicle is damped. This prevents production of vibration produced during general running except very slow running and idle operation, and permits improvement of riding sensation and quietness.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body in a vehicle such as an automobile, and more specifically, it relates to a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body, and more specifically, the present invention relates to a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body. This relates to a vibration damping support method that uses a variable control type vibration damping rubber device to elastically support the internal combustion layer from the vehicle body.

BACKGROUND OF THE INVENTION In vehicles such as automobiles, it is desirable to reduce vehicle body vibration and cabin noise caused by the vibration of the internal combustion engine mounted on the vehicle, thereby improving the comfort and quietness of the vehicle. In order to improve this, it has been conventional practice to provide anti-vibration support for internal combustion engines from the vehicle body using anti-vibration rubber devices. A so-called variable control type anti-vibration rubber device in which the spring constant changes was first applied for in 1987-1987.
350θ (Utility Model Application No. 191931/1983), Patent Application No. 1983
Various proposals have been made in U.S. Pat.

In a vehicle in which the internal combustion engine is supported by the vehicle body using a variable control type anti-vibration rubber device as described above, the dynamic spring constant of the anti-vibration rubber device can be varied by 17J fldJ ail lfi.
If it is not done properly, there is a risk that the ride comfort and quietness will deteriorate.

OBJECT OF THE INVENTION The present invention provides the '5J change 11i!' in which the dynamic spring constant changes. l
In order to improve the riding comfort and static stability of the vehicle by using a cross-type anti-vibration rubber device and appropriately controlling the dynamic spring constant of the anti-vibration rubber I device, the internal combustion engine is supported from the vehicle body in an anti-vibration manner. The purpose is to provide a vibration support method.

Structure of the Invention The above-mentioned object of the present invention is to provide a vibration isolating support method for elastically supporting an internal combustion engine from a vehicle body using a variable control type vibration isolating rubber device whose dynamic spring constant changes. detecting the unsprung vibration of a suspension system that supports the vehicle body from the wheels, and increasing the dynamic spring constant of the variable control type anti-vibration rubber device compared to other times when the unsprung vibration is greater than a predetermined value; This is achieved by a vibration-proof support method for a vehicle internal combustion engine, which is characterized by:

Effects of the Invention According to the present invention, when the unsprung vibration is larger than a predetermined value, that is, when the running vibration is large, the dynamic spring constant of the variable control type anti-vibration rubber device becomes larger than at other times. The support rigidity for the vehicle body is increased, and the occurrence of so-called engine shake, in which the internal combustion engine shakes significantly with respect to the vehicle body due to running vibrations, is avoided.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of the vibration-proof support method for a vehicle internal combustion engine according to the present invention. In FIG. 1, 1 indicates an internal combustion engine, and 2 indicates a transmission, both of which are connected in series when viewed from their rotational axes, and are an assembly of the internal combustion engine 1 and transmission 2. 3 is the principal axis of inertia lr of the rolling motion of the assembly, with both ends in the axial direction (left and right directions in the figure)
At the top, there is a vibration-proof rubber device with the main axis of inertia above the center of inertia.
and 1 by 5! It is supported by the rest 6, and has an elastic center on the principal axis of inertia Ip of the pitching motion which is orthogonal to the principal axis of inertia 1r of the rolling motion at the center of gravity G of the assembly on both front and rear sides. It is supported by the vehicle body 5 by anti-vibration rubber devices 7 and 8.

The anti-vibration rubber devices 4 and 5 are constituted by general bush-type anti-vibration rubber devices, and the anti-vibration rubber devices 7 and 8 are constituted by variable control type anti-vibration rubber devices as shown in FIG. ing.

Next, one embodiment of a variable control type anti-vibration rubber device used in the anti-vibration support method according to the present invention will be described with reference to FIG. The vibration isolating rubber device has two frames 11 and 12, the frame 11 is made up of a single plate member, and a mass member 11'a is attached to the frame 11. . The frame body 12 is constituted by an assembly of a cylindrical member 13, an annular member 14, and a bottomed cylindrical member 15, which are fastened to each other by bolts 16. The frame body 11 is fixedly connected to the internal combustion engine 1 by a mounting bolt 17, and the frame body 12 is fixedly connected to the vehicle body 6 by a bolt 18 at its bottomed cylindrical member 15.

A rubber-like elastic member 20 made of rubber or rubber-like material and having an annular wall portion 19 is provided between the frame 11 and the cylindrical member 13 of the frame 12. The body 11 and the cylindrical member 13 are elastically connected to each other. The rubber-like elastic member 20 cooperates with the annular member 14 inside the cylindrical member 13 to define a chamber space 21 . The annular member 14° has a relatively large opening 22 in the center thereof, and the chamber space 21 communicates with another chamber space 23 through the opening 22. The chamber space 23 is defined by a diaphragm 24 on the opposite side of the chamber space 21 across the annular member 14, and the chamber space and the chamber space 21 are each filled with a liquid having an appropriate viscosity. There is.

A plate-shaped valve element 25 is provided within the chamber space 21.
The valve element selectively seats on the valve seat 26 around the opening 22 by moving up and down in the figure, and
can be closed selectively. The valve element 25 has a throttle passage 27 that is open on both plate surfaces thereof, and the throttle passage is connected to the chamber space 21 even when the valve element 25 is seated on the valve seat part 2G and closes the inner part 22. and 23 are connected to each other.

The valve element 25 integrally has a valve shaft 28, and a solenoid device W129 provided in the bottomed cylindrical member 15 is attached to the valve shaft.
A suction plate 30 is fixed with screws 31. When the electromagnetic coil 32 is energized and is excited, the solenoid device ff129 resists the spring force of the compression coil spring 33 (the suction plate 30 is sucked downward in the figure and the valve element 25 is On the other hand, when the electromagnetic coil 32 is not energized and is demagnetized, the adsorption plate 30 is moved upward as shown in the figure by the spring force of the compression coil spring 33. The upward movement drives the valve element 25 to the Ur1 valve position where it is further away from the valve seat 61+26.

The 7t2tti coil 22 of the solenoid device 29 is energized by an electrical control device 34 as shown in FIG.
It is now carried out by

The control system @34 receives information regarding the unsprung vibration of the suspension system that supports the vehicle body from the wheels from the vibration sensor 35, and information regarding the vehicle speed from the vehicle speed sensor 36, and receives information about the vibration detected by the vibration sensor 35. The electromagnetic coil 32 is energized only when the level is above a predetermined value, for example (1 or 2 G), and the vehicle speed detected by the vehicle speed sensor 36 is above a predetermined value, for example 15+++/l+; otherwise, the electromagnetic coil 32 is not energized.

In addition, unsprung vibration is vibration caused by the road surface as a force source when the vehicle is running.In order to detect this unsprung vibration, a vibration sensor 4]"35 is installed on the lower arm, knuckle arm, brake drum, etc. of the suspension system. f1 has been eclipsed.

31 to the electromagnetic coil 32 by the control device 34 as described above.
By controlling the energization, when the level of unsprung vibration detected by the vibration sensor 35 is 0.2 G or more and the vehicle speed is 15 km/h or more, that is, when the vehicle is running at a very low speed such as when driving at a slow speed or when driving at idle. When the vibration under the mouth spring is large during normal driving, the valve i25 is seated on the valve seat 26, the opening 22 is closed, and the liquid in the chamber space 21 passes through the throttle passage 27 only to enter the chamber space. 23, the dynamic spring constant and viscous damping coefficient of the anti-vibration rubber i devices 7 and 8 become large, so that large-amplitude vibrations such as engine shake caused by vehicle running are effectively damped. become.

The vehicle speed is 15 km/I+ or less and the level of unsprung vibration is 0.
．． When the pressure is 2G or less, the valve element 35 is separated from the valve seat 26 and the opening 22 is opened, and the liquid in the chamber space 21 freely enters and exits the chamber space 23 through the opening, so that the vibration isolating rubber device The dynamic spring constants and viscous damping coefficients 7 and 8 are small <<', and the transmission of the slight movement of the internal combustion engine 1 and the variable speed vA2 to the vehicle body, which causes idling vibration, is prevented.

In the embodiment described above, the energization to the electromagnetic coil 32 is controlled by a combination of unsprung vibration and medium speed, but medium speed does not necessarily have to be detected, and the vibration sensor 35 detects unsprung vibration,
The energization of the electromagnetic coil 32 may be controlled only in accordance with the magnitude of the unsprung vibration, and the dynamic spring constant of the vibration isolating rubber device may be variably controlled.

FIG. 4 shows another embodiment of a control system implementing the vibration-proof support method for 11 internal combustion engines according to the present invention. In this embodiment, the control device 34 receives information about the unsprung vibration detected by the vibration sensor 35 and information about the vehicle speed detected by the vehicle speed sensor 36, as well as information about the throttle opening sensor 37. Given information about the detected throttle opening, that is, the load of the internal combustion engine, if the level of unsprung vibration detected by the vibration sensor 35 is above a predetermined value, and the vehicle speed detected by the Rin3G is a predetermined value or more, the rate of change in the throttle opening detected by the throttle opening sensor 37 is a predetermined value, for example 9Q.
The electromagnetic coil 32 is energized during sudden acceleration or deceleration at deg/s or more, and is not energized at other times.

Therefore, in this embodiment, the internal combustion engine is prevented from shaking significantly with respect to the vehicle body due to sudden torque fluctuations related to the internal combustion engine, other than during normal driving when engine shake may occur. Even during sudden acceleration or sudden deceleration, which may occur, the opening portions 22 of the anti-vibration rubber devices 7 and 8 are closed by the valve element 35, and the dynamic spring constant and viscous damping coefficient of the anti-vibration rubber devices are large. This prevents the engine shake from occurring.

FIG. 5 shows yet another embodiment of the control system used to implement the vibration-proof support method for internal combustion vehicles for vehicles according to the present invention. In this embodiment, the control device 34 receives information regarding unsprung vibration from the vibration sensor 35 and information regarding the vehicle speed from the vehicle speed sensor +J36, and sends information regarding the vehicle speed to the throttle D.
The rJ degree sensor 37 provides information regarding the throttle opening of the internal combustion engine, and the key switch 38 provides information regarding starting and stopping the internal combustion engine 1, and the level of unsprung vibration detected by the vibration sensor 35 is set to a predetermined value. When the vehicle speed detected by the vehicle speed sensor 36 is above a predetermined value, and when the rate of change in the throttle opening detected by the throttle opening sensor 37 is above a predetermined value, the rapid acceleration and deceleration are as follows. When starting and stopping the internal combustion engine 1, the electromagnetic coil 3
The electromagnetic coil 32 is energized at other times.
Power is not applied to the

Therefore, in this embodiment, (1) is applied during normal driving where there is a risk of engine shake, during sudden acceleration and sudden deceleration where there is a risk of a lurching phenomenon, and during sudden deceleration where there is a risk of a lurching phenomenon. When an internal combustion engine is started or stopped, the dynamic spring constant and viscous damping coefficient of the anti-vibration rubber device become large, thereby effectively preventing the occurrence of engine shaking, jerking, and bouncing phenomena.

FIG. 6 shows yet another embodiment of a control system used to implement the vibration-proof support method for a vehicle internal combustion engine according to the present invention.

In this embodiment, the control device 34 is given information regarding the rotational speed of the internal combustion engine nii from the rotational speed sensor 39 in addition to the information in the embodiment shown in FIG. In addition to the vehicle speed or a predetermined value,
For example, the rotation speed of the internal combustion engine 1 is less than 10/h and the rotation speed of the internal combustion engine 1 detected by the rotation speed sensor 39 is a predetermined value, for example 3000.
ppm or more, that is, when starting suddenly, the electromagnetic coil 3
2 is energized.

Therefore, in this embodiment, even during a sudden start when the IT speed is 10 km/h or less and the engine speed is 30 Orpm or more, the spring constants of the anti-vibration rubber devices 7 and 8 and the damping coefficient of the viscosity 11 become large. Attenuation of vibrations that occur at this time is effectively reduced.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to these, and it is understood that various embodiments can be made within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

Fig. 1 shows one embodiment of the vibration-proof support method for a vehicular internal combustion engine according to the present invention (■ Schematic plan view; Fig. 2 shows the vibration-proof support method for a vehicle internal combustion engine according to the present invention). One embodiment of the variable control type anti-vibration rubber device used is shown in a vertical cross-sectional view, and Figs. It is a block diagram showing 1... internal combustion engine, 2... transmission, 3... -a1 three-dimensional, 4.5... vibration isolating rubber device, 6... vehicle body, 7.8・
...Variable control type anti-vibration rubber@yi, 11.12...Frame body,
13... Cylindrical member, 14... Annular member, 15...
Bottomed cylindrical member, 16... Bolt, 17. 18... Take (= J bolt, 19... Annular wall part, 20... Rubber-like elastic member, 21... Chamber space. 22. ... Frontage part, 23 ... Chamber space, 24 ... Die A7 flam, 25 ... Valve element, 26 ... - Valve seat part, 2
7... Throttle passage, 28... Valve stem, 29... Solenoid device, 30... Adsorption plate, 31... Screw, 32...
...Electromagnetic = 1 Ile, 33...Compression 7-1 Ile spring, 3
4...System 611 equipment purchase, 35...1 Shindo Senri, 3G
...Vehicle speed sensor, 37...1 ton 1~61 degree sensor, 38...Key switch, 39...Rotational speed sensor
People Patent Attorney Masaki Akashi

Claims (1)

[Claims] In an anti-vibration support method that elastically supports an internal combustion engine from the vehicle body using a variable control type 11 anti-vibration rubber device that changes the dynamic spring constant, unsprung vibrations of the suspension system that supports the vehicle body from the wheels are detected. A vibration-isolating support method for a vehicle internal combustion engine, characterized in that when unsprung vibration exceeds a predetermined value, a damping constant of the variable control vibration-isolating rubber device is made larger than at other times.