JPH06183268A - Supporting device for internal combustion engine in vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] In principle, passive mounting is used in engine mounting to reduce the cost, and the vibration control between the active mount and this passive mount minimizes the use of the vehicle. Vibrations transmitted to the room are damped as much as possible to improve mount performance. [Structure] Among a plurality of mounts supporting the engine 1, some mounts 6 are active type ones capable of switching dynamic characteristics. In the computer 16, the vibration input S to be sent to the active mount 6 is calculated corresponding to the target vibration that can cancel the vibration transmitted from the mounts other than the active mount 6 to the vehicle compartment, and the vibration input S is input to the active mount 6. Send S to output the target vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for an internal combustion engine (hereinafter also referred to as engine mounting) that damps vibrations transmitted from the internal combustion engine (hereinafter also referred to as engine) to the vehicle cabin in various vehicles.

[0002]

2. Description of the Related Art Conventional engine suspension systems include many suspension systems such as a three-point mount, a four-point mount, and a five-point mount. For example, in a conventional FF vehicle engine horizontal four-point mount, a left mount and a right mount are installed on both sides of an inertia main axis (almost coincident with the roll axis) along the axial direction of the crankshaft of the engine. A front mount and a rear mount are installed on both sides in a direction orthogonal to the principal axis of inertia, and a passive type with a constant static spring constant is used as these mounts.

However, in such a four-point mount, since the static and dynamic characteristics are constant, good vehicle performance cannot always be maintained. Therefore, active mounts that can switch the static and dynamic characteristics have been used as performance requirements have become more sophisticated.

A conventional three-point mount utilizing such an active mount is, for example, Japanese Patent Laid-Open No. 3-669.
There is one shown in Japanese Patent Publication No. 49. Since all of these three-point mounts are of the active control type, they have the drawback of being extremely expensive as compared with the case of using a passive mount.

The present invention basically uses a passive mount in engine mounting to reduce the cost, and
The purpose of this is to improve the mount performance by damping the vibration transmitted to the passenger compartment as much as possible by the vibration control between the active mount and the passive mount that are kept to a minimum.

[0006]

In a support device for an internal combustion engine according to the present invention, among a plurality of elastic supports that support the internal combustion engine, some of the elastic supports are capable of switching dynamic characteristics. A vibration type input means and a control means are provided. The vibration input calculating means calculates the vibration input to be sent to the active elastic support in response to the target vibration that can cancel the vibration transmitted from the elastic support other than the active elastic support to the vehicle interior. It has become. In the control means, the vibration input is sent to the active elastic support to output the target vibration.

[0007]

When the vibration input calculation means calculates the vibration input, the control means controls the active elastic support based on the vibration input to output the target vibration from the active elastic support.
Therefore, the vibration transmitted to the vehicle compartment from the elastic supports other than the active elastic support is canceled by the target vibration, and the vibration of the vehicle interior is attenuated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An FF vehicle engine horizontal mounting engine mounting according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a left passive mount 3 and a right passive mount 4 as elastic supports are installed on both sides of the engine 1 on a roll shaft 2 of the engine 1 (substantially coincident with the principal axis of inertia). . Further, a front passive mount 5 and a rear active mount 6 as elastic supports are installed on both sides of the engine 2 along a direction orthogonal to the roll shaft 2.

The rear active mount 6 is an active type whose dynamic characteristics can be switched, and the one shown in FIG. 2 is used as an example thereof. The rear active mount 6 will be outlined. The rubber ring 8 is attached to the annular base plate 7, and the movable body 9 is attached to the rubber ring 8. In this movable body 9, a support cylinder 9a is attached on a rubber ring 8, and both inner and outer rings 9b,
9c, a cover 9d and a holding plate 9e are sequentially superposed and attached. The piezoelectric element stack 10 is erected in the support cylinder 9a, and the movable plate 11 is attached to the upper end of the piezoelectric element stack 10 inside the inner ring 9b. A rubber seal 12 closes the outer periphery of the movable plate 11 and the inner periphery of the inner ring 9b. A piston 13 is attached to a central portion of the cover 9d via a rubber tube 14. A liquid chamber 15 is formed between the cover 9d and the movable plate 11. When a load is applied to the piston 13, the load is transmitted to the rubber ring 8 via the movable body 9, and the rubber ring 8 bends by a predetermined amount.

As shown in FIG. 3, an engine control computer (hereinafter abbreviated as computer) 16 is connected with a cam position sensor 17 for generating an ignition signal in synchronization with the engine stroke. The computer 16 calculates the rotation speed N of the engine 1 from this ignition signal. The vibration of the engine 1 changes almost constantly according to the ignition signal and the rotation speed N, and the phase thereof can be predicted. for that reason,
The computer 16 stores vibrations (approximately shown in FIG. 4A) generated in a specific region M (for example, a member) in the vehicle compartment for each rotation speed N. Here, A is the amplitude and T is the period. Note that this vibration may be measured.

In the four-point mount engine suspension system, the rear active mount 6 is located on the center line of the vehicle at a position closest to the passenger compartment. When vibration is applied to the piston 13 of the rear active mount 6, the piezoelectric element stack 10 expands and contracts due to the vibration input S from the computer 16, the movable platen 11 moves, and the piston 13 follows the pressure in the liquid chamber 15. Therefore, the rear active mount 6 outputs the target vibration based on the vibration input S from the computer 16. The output vibration is shown in FIG. Comparing the vibration of FIG. 4A and the vibration of FIG. 4B, the amplitude A and the period T are the same, but the phases are shifted from each other and are almost inverted. Strictly speaking, the phase difference π + θ is given in consideration of the time difference until the output vibration from the rear active mount 6 is transmitted to the vehicle interior specific region M (for example, the member). The computer 16 stores the vibration input S to be sent to the rear active mount 6 so that the output vibration of the rear active mount 6 becomes the state of FIG. 4B for each rotation speed N.

Now, the computer 16 uses the engine ignition signal from the cam position sensor 17 as a basis for the engine 1
Is calculated, and the vibration input S to be sent to the rear active mount 6 is calculated based on the calculated rotation speed N. The computer 16 controls the rear active mount 6 based on the vibration input S to output the target vibration from the mount 6. Therefore, in a specific area M (for example, a member) in the vehicle interior, the output vibrations from the passive mounts 3, 4, 5 and the output vibrations from the rear active mount 6 cancel each other out, and the vibrations in the specific area M are damped. . Therefore, the vibration damping effect is enhanced.

In particular, in the four-point mount engine suspension system according to this embodiment, the left mount 3, the right mount 4, and the front mount 5 are of passive type, and only one rear active mount 6 is of active type. Therefore, it is possible to reduce the cost by suppressing the use of the expensive active mount 6. In that case, since the above-described anti-vibration control is performed between the passive mounts 3, 4, 5 and the rear active mount 6, the anti-vibration effect is also obtained while suppressing the use of the active mount 6 having high performance. Get higher The effect is each mount 3, 4,
It becomes large when the rear mount 6 closest to the passenger compartment of the vehicles 5 and 6 is made active.

Although the four-point mount suspension system is shown in the above embodiment, the present invention may be applied to a three-point mount suspension system or a five-point mount suspension system. In that case, one of the mounts closest to the passenger compartment is made the active system. In the four-point mount suspension system and the five-point mount suspension system, it is possible to make two mounts of each mount close to the passenger compartment active.

[0016]

According to the support device for an internal combustion engine of the present invention, some of the plurality of elastic supports that support the internal combustion engine are active type ones whose dynamic characteristics can be switched. Since it is utilized, the cost can be reduced as compared with the case where all are made of the active type elastic support.
Moreover, since the predetermined vibration control is performed between the active elastic support and the other elastic supports, the anti-vibration effect is enhanced even though the use of the active elastic support is suppressed. be able to.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a four-point mount engine suspension system according to the present embodiment.

FIG. 2 is a sectional view showing a rear active mount used in this embodiment.

FIG. 3 is a control block circuit diagram of a rear active mount according to the present embodiment.

FIG. 4A is an approximate waveform diagram of vibration generated in a specific area (for example, a member) in the vehicle compartment due to output vibration of each passive mount according to the present embodiment, and FIG. 4B is a rear active according to the present embodiment. It is an approximate waveform figure which shows the target vibration output from a mount.

[Explanation of symbols]

1 engine as an internal combustion engine, 3 left passive mount as elastic support, 4 right passive mount as elastic support, 5 front passive mount as elastic support, 6 rear active mount as active elastic support, 16 Engine control computer as vibration input calculation means or control means,
S Vibration input.

Claims (1)

[Claims] 1. An elastic support that is capable of switching dynamic characteristics is used as a part of the plurality of elastic supports that support an internal combustion engine, and an elastic support other than the active elastic supports is used. Vibration input calculation means for calculating the vibration input to be sent to the active elastic support in response to the target vibration capable of canceling the vibration transmitted from the body to the passenger compartment, and sending this vibration input to this active elastic support. And a control means for outputting a target vibration.