JPS60244623A - Vibration control device for vehicle - Google Patents

Abstract

PURPOSE:To reduce disturbance due to torque variations applied to a vehicle body to reduce the vibration of the vehicle body, by providing a control circuit for driving an actuator in accordance with an electrical signal from a load transducer for detecting torque variations. CONSTITUTION:An actuator 6 is attached to a vehicle body 4, and a load transducer 7 is attached to the lower section of a front engine mount 2. A control circuit 8 receives a signal from the load transducer 7 and drives the actuator 6. With this arrangement. Disturbances due to torque variations produced by the engine 1 and transmitted to the vehicle body 4 is directly detected by the load transducer 7 which is attached to the engine mount 2 and which therefore issues an electrical signal. A computing circuit receives the signal through a load detecting circuit to adjust the gain and phase of the signal to satisfy a predetermined control rule, and then transmits the signal to a vibration circuit for driving the actuator 6 so that the direction of control force of the actuator 6 is set in the direction in which the disturbance due to torque variations is cancelled out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vibration control device for a vehicle that suppresses normal vibrations excited by fluctuating torque disturbances from an engine.

[Prior art]

One of the important technical issues for vehicles such as automobiles is the pursuit of comfortable vehicles with excellent riding comfort and vibration resistance.

In order to improve ride comfort, we have taken measures such as installing a damping force control device for the shock absorber that supports the car body, and adding full vibration absorption functions to the mount mechanism that supports the engine to reduce car body vibration. I'm trying. However, in the F, F (front engine 9 engine, front drive) system with a horizontally mounted engine, the driving reaction torque of the engine is particularly large, and its direction matches the vibration direction of the vehicle body, so the fluctuating torque from the engine is The problem arises that the vibrations of the real body transmitted through the mount) f are excessively excited.

The engine mount is the point of contact between the engine and the vehicle body, and there are many issues to consider when designing it, and the following conflicting conditions must be satisfied. In other words, in the region where the driving reaction torque is large, the engine mount needs to be made rigid to limit the displacement of the engine and exhaust system such as the muffler, and in the region where the torque is relatively small in the idling and mid-to-high speed ranges. In this case, the mount needs to have low rigidity for the main purpose of vibration isolation. It is extremely difficult to achieve these contradictory conditions in a high-dimensional manner, and if the natural frequency of the bending mode vibration of the car body is close to or coincides with the idling rotation speed range, the vibration of the car body becomes large and the ride becomes uncomfortable. There is a problem that the value decreases. Reducing vehicle body vibration, including the engine mount, is an important technical issue in improving vehicle ride comfort and comfort. Especially for vehicles that are horizontally mounted engines that use the F or F drive system, the natural frequency of the vehicle body is close to or exists in the idle link rotation speed region, and the direction of the fluctuating torque roughly matches the direction of vibration of the vehicle body. As a result, excessive vibrations were excited in the vehicle body, resulting in a significant decrease in riding comfort and comfort.

Figure 1 shows the exact vibration generation mechanism of the vehicle. 1 is the engine, 2 is the front engine mount, 3 is the front engine mount that is elastically supported, and 3 is the rear side that is supported. It is a 4-seater car body, and the engine is attached to the car body 4 via the engine mount 2.3. 5 is a seat. by the way,
In a horizontally mounted engine, the engine 1 has a plurality of cylinders, and their arrangement is perpendicular to the direction transverse to the vehicle body 4, that is, the longitudinal direction, so the behavior of the engine 1 follows the pressure fluctuations in the cylinders in the direction of the arrow. On the other hand, in 2bo, rocking vibration is excited about the drive shaft as the center of rotation due to the torque applied.
The vibration characteristics of the vehicle body 4 include a natural frequency (usually about 25
18Z) exists.

In particular, when the frequency of the rocking vibration of the engine 1 and the natural frequency of the vehicle body match or become close to each other, in the idling speed region, the vehicle body is excited with excessive vibration due to a resonance phenomenon, and this vibration is transmitted to the seat 5. Ride quality and comfort deteriorate, causing physical and mental pain to the occupants.

[Summary of the invention]

This invention was made with the aim of improving such drawbacks, and includes an actuator that detects a fluctuating torque disturbance applied to the vehicle body from the engine and applies a damping force to the vehicle body to cancel out the fluctuating torque disturbance. The present invention provides a vibration control device for a vehicle that reduces vehicle body vibration and improves riding comfort and comfort.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. - In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts, so the explanation will be omitted. Actuator attached to 6 pieces 1 body 4, 7
Reference numeral 8 indicates a load converter disposed at the lower part of the front engine mount 2, and 8 indicates a control circuit that detects a signal from the load converter 7 and drives the actuator 6.

This is a detailed view of the front engine mount 2 of the third [1iH-J engine 1], in which an elastic mount 21 made of rubber or the like and a holder 22 that holds this mount 21 are connected to the vehicle body 4 via a load converter 7. It is installed in Actuator 6 is driven by control circuit 8 in response to a detection signal from load converter 7 .

FIG. 4 is a block diagram of the control circuit 8, in which 81 is a load detection circuit, 82 is an arithmetic circuit, and 83 is a drive circuit. The load transducer 7 is composed of a piezoelectric element or a strain gauge, and the variable torque disturbance transmitted from the engine 1 to the vehicle body 4 is directly detected and extracted as an electrical signal. This fluctuating torque disturbance is amplified by an electric signal lamp load detection circuit 81 which is proportional to the disturbance and inputted to an arithmetic circuit 82. The arithmetic circuit 82 is a circuit with predetermined gain and phase characteristics, and fully adjusts the gain and phase of the electric signal to drive the circuit. 83.

The drive circuit 83 supplies 4 powers (to drive the actuator 6). As a result, the control force generated from the actuator 6 is applied in a direction that prevents vibrations of the vehicle body 4, and vibrations of the vehicle body 4 can be actively reduced.

FIG. 5 shows all the embodiments in which an electrodynamic linear actuator is applied to the actuator 6. In the figure, 61 is a permanent magnet, 62 is a cylindrical yoke, 63 is a coil, and 64
65 is a coil support that fully supports the coil 63; 65 is a support spring that is disposed at both the upper and lower ends of the yoke 62 and that holds the entire yoke;
Slide bearings are fixed to the upper and lower ends of the 6-piece kite rod and the 67-piece yoke 62, and the bearings 67 slide along the guide rod 66 and are driven in the vertical direction (yoke 627>Z). 68 is a casing. To explain the operation of the electrodynamic linear actuator, the permanent magnet 61
The coil 63 is magnetized in the radial direction and fixed to the yoke 62 to form a magnetic circuit, and a predetermined magnetic flux density is generated in the gap where the coil 63 is inserted.With this configuration, current is supplied to the coil 63 from the drive circuit 83. Then, an electromagnetic force is generated between the coil 63 and the permanent magnet 61. At this time, the electromagnetic force generated in the coil 63 is transmitted to the casing 68 fixed to the vehicle body 4 via the coil support 64, and On the other hand, the electromagnetic force generated in the permanent magnetic force 61 acts on the yoke 6.
The sum of the restoring force of the supporting spring 65 and the inertial force of the yoke 62 and the permanent magnet 61 is balanced. These mechanical models are shown in FIG. 9 is an additional mass that is the sum of the yoke 62 and the permanent magnet 61, and the supporting spring 65 has a spring constant Rd. Ull-]: An electromagnetic force acting between the coil 63 and the permanent magnet 61, and an allocation force T added to the electromagnetic force U and the restoring force of the support spring 65 acts on the vehicle body 4K. Also, the support spring 6
5 serves to secure the neutral position tF=j' of the yoke.

With the above-described configuration, the variable torque disturbance generated from the engine 1 and transmitted to the vehicle body 4, and the engine mount 2
The load converter 7V installed on the
The gain and phase are adjusted to satisfy a predetermined control law, and the signal is transmitted to the drive circuit 83. The drive circuit 83 drives the actuator 6 mounted on the vehicle body 4. Then, the direction i1 of the control force generated from the actuator 6 [engine 1 to body 4]
If the direction is set to cancel out the fluctuating torque disturbance from the vehicle body 4,
As a result, the external disturbance applied to the vehicle body is reduced, and the vibration of the vehicle body is extremely reduced, resulting in an improved ride comfort of the vehicle.

I'm sure comfort will be improved.

In the embodiment of the present invention, the load converter 7 is provided on the front engine mount side, but the same effect can be obtained even if the load converter 7 is provided on the rear engine mount side. Further, as the actuator 6, it is also possible to use a pneumatic or hydraulic actuator in addition to a linear actuator.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided an actuator installed in a vehicle body that vibrates in response to fluctuating torque disturbance from the engine, a load N converter that detects i-dynamic torque from the engine, and this load converter. The control circuit that drives the actuator based on the electric signal from , it has the effect of reducing vibrations to the vehicle body and significantly improving the ride quality and comfort of the vehicle1.
,

[Brief explanation of drawings]

Fig. 1 is a diagram showing the vibration generation mechanism of a vehicle, Fig. 2 is a block diagram of the vibration control device according to the present invention, Fig. 3 is a partially enlarged view of the engine mound, and Fig. 4 is a block diagram of the control circuit 1. , FIG. 5 is a sectional view showing an example of the actuator,
FIG. 6 is a diagram of a dynamic model of the actuator. 1... Engine 1, 2... Front engine mount, 4... Vehicle body, 6... Actuator, 7...
Load converter, 8... Control circuit, 8]... Load detection circuit, 82... Arithmetic circuit, 83... Drive circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 5 Figure 6

Claims (1)

[Claims] An actuator installed on the vehicle body that generates excitement when it receives fluctuating torque disturbances from the engine, a load converter attached to the engine mount, and this load converter detects fluctuating torque disturbances transmitted from the engine to the vehicle body. A vibration control device for a vehicle, comprising a control circuit that controls and drives an actuator based on a detection signal from a load converter.