JPH0495634A - Vehicle vibration reducing device - Google Patents

Abstract

PURPOSE:To obtain the effect of reducing vibration and noise by installing an excitation machine on a car body, by detecting the riding position of a passenger, and by controlling the excitation machine so as to reduce the vibration and noise at the riding position. CONSTITUTION:An excitation machine 4 is provided with a shaft 7, a core 8, a solenoide 9, which can be displaced and are almost in a vertical direction, and is fixed to a center member 5 of a vehicle, and is controlled by an electronic control unit 30 provided with a ROM 32, a RAM 33, and a CPU 34. Each riding position sensor 20, 21, 22 is connected to an input port 35, and the riding position of the seat other than a driver's seat is detected thereby. Through the inputting of the signal of each riding position sensor 20, 21, 22 as well as a temperature sensor 23 of an engine mount, the excitation machine is so controlled as to offset the vibration generated on the vehicle. The vibration and noise are reduced according to the riding position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vehicle vibration reduction device.

[Conventional technology]

Japanese Patent Application Laid-Open No. 64-35141 discloses a vehicle equipped with a vibration exciter for applying a damping force to the vehicle body, and by controlling this vibration machine, vibration of the vehicle body and muffled noise inside the vehicle are reduced. A vehicle vibration reduction device is disclosed.

[Problem to be solved by the invention]

However, this device does not detect the passenger's boarding position, that is, which seat the passenger is in. Therefore, if the vibration exciter is controlled to reduce the vibration and noise at all seats, the vibration and noise will be reduced. There is a problem that a sufficient noise reduction effect cannot be obtained. That is, the greater the number of seats whose vibration and noise are to be reduced, the smaller the effect of reducing vibration and noise.

[Means to solve the problem]

In order to solve the above problems, according to the present invention, a vibration exciter for applying a damping force to the vehicle body is mounted on the vehicle body, and a riding position detection means for detecting the riding position of the occupant is provided. A control means is provided for controlling the vibrator so as to sufficiently reduce vibration and noise at the riding position of the occupant based on the detection results of the means.

[For production]

The riding position of the occupant is detected, and the vibration exciter is controlled to sufficiently reduce vibration and noise at the riding position of the occupant.

〔Example] First, a first example will be described.

FIG. 2 shows a side view of the vehicle vibration reduction device.

In FIG. 2, the left side is the front of the vehicle and the right side is the rear of the vehicle. Referring to FIG. 2, the upper end of the radiator 1 is supported by an armrest support 3 via a support 2 made of rubber, so that the radiator 1 can move up and down. The vibrator 4 is fixed on the center member 5 and is arranged below the radiator 1 in parallel with the radiator 1.

FIG. 3 shows an enlarged sectional view of the main part of FIG. 2. Referring to FIG. 3, the housing 6 of the vibrator 4 is fixed on a center member 5 extending in the longitudinal direction of the vehicle. Vibrator 4
A shaft 7 located approximately at the center of the shaft 7 extends approximately perpendicularly to the center member 5 and is movable in this direction. A cylindrical core 8 is fixed to the shaft 7 so as to surround the shaft 7. A solenoid 9 is attached to the outer periphery of the core 8. A cylindrical permanent magnet 10 is arranged opposite the outer peripheral surface of the solenoid 9, and this permanent magnet 10 is fixed on the inner peripheral surface of the housing 6. The core 8 has compression coil springs 11 arranged on the upper and lower end surfaces of the core 8,
12 so as to be movable relative to the housing 6. The lower end of the shaft 7 protrudes from the housing 6 and passes through the center member 5. The lower end of the shaft 7 is connected to a lower tank 14 of the radiator 1 via an oval-shaped offset arm 13. Therefore, when the shaft 9 of the vibrator 4 moves up and down, the radiator 1 is also moved up and down. A waterproof packing 15 is arranged between the offset arm 13 and the center member 5.

The electronic control unit 30 consists of a digital computer with ROMs interconnected by a bidirectional bus 31.
(read only memory) 32, RAM (random access memory) 33, CPU (microprocessor) 3
4, an input port 35 and an output port 36.

Each riding position sensor 20, 2 for detecting the riding position
1 and 22 are connected to the input port 35. The riding position sensors 20, 21, and 22 are provided under the seats other than the driver's seat, as shown in FIG. ing. Therefore, the riding position sensors 20, 21,
The boarding position can be detected by the signal No. 22.

Also, a temperature sensor 23 that detects the temperature of the engine mount
is connected to the input port 35 via the A/D converter 37. On the other hand, the output port 36 is connected to the solenoid 9 via a corresponding drive circuit 38.

In order to cause the vibrator 4 to generate vibrations that cancel out the vibrations generated in the vehicle, a control current having a frequency, phase, and gain depending on the engine rotation speed is applied to the solenoid 9. This causes the housing 6 of the vibrator 4 to vibrate to offset the vibrations of the vehicle.

When the temperature of the engine mount changes depending on the operating state of the engine, the spring constant of the engine mount changes.

When the spring constant of the engine mount changes, the phase and amplitude of vibrations transmitted from the engine to the vehicle body, such as the center member 5, change even under the same engine operating state. Therefore, if the vibration exciter 4 is controlled based on a map that does not take into account the temperature of the engine mount, the vibrations of the vehicle cannot necessarily be offset by the vibrations generated by the vibration exciter 4, and the temperature of the engine mount increases. In some cases, vehicle vibration cannot necessarily be reduced.

In this embodiment, a plurality of maps are used to detect the temperature of the engine mount and control the phase and gain of vibration of the vibrator 4 according to the temperature of the engine mount. We try to select the most suitable map depending on the situation. As a result, even if the temperature of the engine mount changes, the vibrations of the vehicle can always be offset by the vibrations generated by the vibrator 4, and thus the vibrations of the vehicle can be sufficiently reduced.

By the way, if an attempt is made to reduce the vibration and noise in all seats using the vibrator 4 without detecting which seat an occupant is present, there is a problem that a sufficient vibration and noise reduction effect cannot be obtained. .

Therefore, in this embodiment, the riding position of the passenger, that is, which seat the passenger is in, is detected, and the vibration exciter 4 is optimally controlled according to the riding position of the passenger, thereby sufficiently reducing vibration and noise at the riding position of the passenger. We are trying to reduce it to .

FIG. 1 shows a routine for controlling the operation of the vibrator 4. As shown in FIG. This routine is executed by interrupts at regular intervals.

Referring to FIG. 1, first in step 50, it is read which seat the occupant is in based on the occupant position sensors 20 to 22. Next, in step 51, it is determined whether the engine speed N is equal to or higher than a predetermined engine speed N0. When N≧N0, the muffled sound does not become large, so there is no need to operate the vibrator 4. Therefore, the process proceeds to step 52 and the vibrator 4 is not activated. on the other hand,
If N≧N0, the muffled sound becomes louder, so the vibrator 4 is activated in the following step. Step 53
Now read the engine mount temperature T. Next, Ste.
At the knob 54, a map is selected based on the riding position of the occupant and the temperature T of the engine mount, and the phase φ and gain F for operating the vibrator 4 are determined based on the selected map. The number of maps is given in advance according to the combination of the riding position of the passenger and the temperature of the engine mount.

FIG. 5 shows an example of a map when, for example, there is an occupant only in the driver's seat and the temperature T of the engine mount is between T and T2. As shown in FIG. 5, the map has a phase φ
and gain F are given in relation to engine speed N. Each map is optimally determined so that the vibrator 4 can sufficiently reduce vibration and noise at each engine mount temperature. Furthermore, each map is optimally determined so that the vibration exciter 4 can be optimally controlled in accordance with the riding position of the passenger to sufficiently reduce vibration and noise at the riding position of the passenger.

Next, in step 55, the vibrator 4 is activated based on the phase φ and the gain F.

Next, a second embodiment will be described. The second example is
The noise level of the muffled sound in the seat where the occupant is present is detected by a microphone, and the exciter is feedback-controlled so that the detected noise level of the muffled sound is minimized. Points different from the first embodiment will be explained below.

Referring to FIG. 4, microphones 25 to 28 are built into the headrest of each seat, and detection signals from these microphones 25 to 28 are input to the input port 35 (see FIG. 3) of the electronic control unit 30. Ru.

FIG. 6 shows a routine for executing the second embodiment. This routine is executed by interrupts at regular intervals.

Referring to FIG. 6, the riding position is read in step 60, and it is determined in step 61 whether the engine speed N is greater than or equal to N0. When N < No, the process proceeds to step y pro 2 and f is cleared. Next, the process proceeds to step 63, where the vibrator 4 is not activated.

-4, if it is determined in step 61 that N≧N0,
Proceeding to step 64, it is determined whether f=0.

When f=o, that is, immediately before starting feedback control, the process advances to step 65 and the engine mount temperature T is
is loaded. The process then proceeds to step 66, where the optimum map is selected based on the riding position and engine mount temperature T, and the phase φ and gain F are determined. The phase φ and gain F obtained here become the initial values for feedback control. If it is determined in step 64 that f≠0, that is, if feedback control is already being executed, steps 65 and 66 are skipped.

Note that f is cleared when the starter switch is turned off. Next, in step 66, the noise level of the muffled sound in the seat where the occupant is present is detected by the microphone;
The phase φ and the gain F are feedback-controlled so that the noise level of the muffled sound detected in the seat where the occupant is present is minimized.

Then, in step 68, f is incremented by one. Next, in step 69, the vibration exciter 4 is adjusted based on the phase φ and gain F determined by the feedback control.
Activate.

As described above, according to this embodiment, the same effects as those of the first embodiment can be achieved.

Furthermore, since the initial M value for feedback control is given based on a map that takes into account the riding position of the occupant, it is possible to shorten the time until the noise level of the muffled sound reaches its minimum.

〔Effect of the invention〕

The vibration exciter can be optimally controlled depending on the riding position of the passenger, and therefore vibration and noise in the seat where the passenger is riding can be sufficiently reduced.

[Brief explanation of drawings]

Fig. 1 is a flowchart for controlling the operation of the vibrator in the first embodiment, Fig. 2 is a side view of the vehicle vibration reduction device, Fig. 3 is an enlarged sectional view of the main part of Fig. 2, and Fig. 4 5 is a perspective view of the interior of the vehicle, FIG. 5 is a phase and gain map, and FIG. 6 is a flowchart for controlling the operation of the vibrator in the second embodiment. 4... Vibrator, 20-22... Riding position sensor, 30... Electronic control unit.

Claims (1)

[Claims] A vibration exciter for applying a damping force to the vehicle body is attached to the vehicle body, and a riding position detection means for detecting the riding position of the occupant is provided, and vibrations at the riding position of the occupant are detected based on the detection result of the riding position detecting means. and a vehicle vibration reduction device comprising control means for controlling the vibration exciter so that noise is sufficiently reduced.