JP3959597B2 - Noise reduction device for transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a noise reduction device that reduces idle noise of a transmission.
[0002]
[Related background]
As is well known, torsional vibrations caused by rotational fluctuations (torque fluctuations) are generated in the engine during idling, and the gear meshes in the transmission are displaced relative to each other within the range of backlash. Therefore, the tooth contact occurs, and this is a factor for generating a unique idle noise called a so-called rattling sound.
[0003]
As a measure for reducing idle noise, for example, a transmission noise reduction device described in JP-A-7-259972 can be cited. In this noise reduction device, a brake shoe is disposed on the outer periphery of a driven gear (counter shaft, main shaft gear, etc.) that is rotationally driven by an input shaft, and for example, the engine is idle and the transmission oil is transmitted. When the temperature is equal to or higher than a predetermined value, the brake shoe is brought into contact with the rotating driven gear by the air cylinder to apply a predetermined braking force, thereby suppressing the movement of the driven gear and reducing noise. Yes.
[0004]
[Problems to be solved by the invention]
In the transmission noise reduction device described in the above publication, this situation is based on the viewpoint that if the viscosity of the lubricating oil decreases as the transmission oil temperature increases, the driven gear becomes easier to move and idle noise increases. In this case, the movement of the driven gear is merely suppressed by braking. However, although the idle noise of the transmission fluctuates according to the oil temperature, the characteristic does not simply increase as the oil temperature rises. For example, as shown in FIG. There is a unique minimum value determined from the specifications of the clutch disk. Therefore, there is a region where noise cannot be reduced only by applying a predetermined braking force uniquely as described above, and a more reliable noise reduction measure has been desired.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transmission noise reduction device that can reliably reduce idle noise regardless of oil temperature changes on the premise of idle noise characteristics based on transmission and clutch disk specifications. It is in.
[0006]
[Means for Solving the Problems]
To achieve the above object, in the invention of claim 1, and a transmission for inputting the rotation of the engine via a disengaging possible clutch, it is connected to the rotating part of the transmission, relative to the rotating part by the actuation A motor / generator capable of applying torque in the same direction and applying torque in the reverse direction to the rotating portion as a result of regeneration, oil temperature detecting means for detecting the oil temperature of the transmission, And a torque control means for driving and controlling the motor / generator based on the unique idle noise characteristics determined from the specifications of the machine and the clutch disk of the clutch and the oil temperature detected by the oil temperature detecting means.
[0007]
Torsional vibration with engine fluctuations (torque fluctuations) as a vibration source generated gear rattling noise in the gear meshing part of the transmission. For example, it depends on the spring constant of the clutch disk, the backlash amount of the gear meshing portion, the mechanical rotational resistance of the transmission, etc., and is also affected by the transmission oil temperature. That is, if the rotational resistance of the transmission increases or decreases with the oil viscosity as the oil temperature increases or decreases, the transmission state of the torsional vibration to the transmission side changes with the operating angle of the clutch disk, which also affects the occurrence of rattling noise. Reach.
[0008]
Here, the motor / generator is controlled based on the detected actual oil temperature at idle noise characteristics and the oil temperature detection means, the oil temperature detecting means than the oil temperature at the time of idle noise minimum For example When the detected oil temperature is low, the torque in the same direction is applied to the rotating part of the transmission as the motor / generator is driven, and the detected oil temperature is higher than the oil temperature when the idle noise is at the minimum value. Sometimes, reverse torque is applied to the rotating portion of the transmission as the motor / generator is regenerated .
[0009]
Therefore, when the actual oil temperature is lower than the oil temperature when the idle noise is the minimum value, torque in the same direction is added to the transmission, and the increase in the rotational resistance of the transmission due to the decrease in the oil temperature is the motor. / When the actual oil temperature is higher than the oil temperature when the idle noise is at the minimum value, which is offset by the drive of the generator, a reverse torque is added to the transmission, and the transmission is accompanied by an increase in the oil temperature. The decrease in the rotational resistance is offset by the regeneration of the motor / generator. Therefore, the operating angle of the clutch disk is maintained at a value when the idle noise is the minimum value, and as a result, the idle noise can be suppressed to the minimum value regardless of the oil temperature change.
At this time, it is desirable to increase the torque applied by the motor / generator as the difference between the oil temperature when the idle noise is the minimum value and the detected oil temperature is larger.
According to a second aspect of the present invention, there is provided a transmission in which engine rotation is input through a connectable clutch, and idle noise characteristics are set so that idle noise becomes a minimum value at a substantially maximum oil temperature in a normal range. A motor connected to the rotating part of the transmission and capable of applying torque in the same direction to the rotating part as driven, an oil temperature detecting means for detecting the oil temperature of the transmission, and an oil temperature detecting means Torque control means for driving and controlling the motor based on the detected oil temperature.
If the idle noise characteristics of the transmission are set so that the idle noise becomes the minimum value at the approximate maximum oil temperature in the normal range, the rotational resistance of the transmission changes only in the increasing direction as the oil temperature decreases. By adding a torque in the same direction to the rotating part of the transmission by driving the motor, idle noise can be suppressed. Thus, since only the torque in the same direction needs to be applied to suppress idle noise, the control can be simplified and the cost can be reduced by applying a motor dedicated to driving .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a noise reduction device for a transmission embodying the present invention will be described.
FIG. 1 is a schematic configuration diagram showing a noise reduction device for a transmission according to the present embodiment, and the configuration of a target transmission is a general one having five forward speeds and one reverse speed in which the fourth speed is directly connected. . That is, as is well known, in the transmission 1, the input shaft 2 and the main shaft 3 are coaxially disposed, and the counter shaft 4 is disposed in parallel to the shafts 2 and 3. The input shaft 2 is rotationally driven by the engine 6 through the clutch 5, and the rotation is transmitted to the counter shaft 4 through the gears 7 and 8. The drive gear 9 of each shift stage fixed on the counter shaft 4 is always meshed with the idle gear 10 on the main shaft 3 (the reverse gear is meshed via the idler gear 11). The idle gear 10 is rotationally driven. Each idler gear 10 is selectively fixed to the main shaft 3 by a sync mechanism (not shown), and the main shaft 3 is rotationally driven with the gear ratio and transmitted to a propeller shaft (not shown).
[0011]
A motor / generator 13 is coupled to the rear end of the counter shaft 4 via a clutch 12, and the motor / generator 13 rotates integrally with the counter shaft 4 when the clutch 12 is connected. The motor / generator 13 is connected to the battery 15 via the inverter circuit 14, and the inverter circuit 14 charges the battery 15 with the regenerative current of the motor / generator 13 and drives the motor / generator 13 with the current from the battery 15. Is controlled. In the present embodiment, the counter shaft 4 you corresponding rotating parts.
[0012]
On the other hand, torque control provided with an input / output device (not shown), a storage device (ROM, RAM, BURAM, etc.), a central processing unit (CPU), a timer counter, etc. provided in the passenger compartment for storing control programs and control maps. An ECU (electronic control unit) 21 is installed as means, and the ECU 21 controls the noise reduction device of the present embodiment. On the input side of the ECU 21, there are a vehicle speed sensor 22 that detects the vehicle speed V, a rotation speed sensor 23 that detects the engine rotation speed Ne, a gear position sensor 24 that detects the gear position of the transmission 1, and an oil temperature T of the transmission 1. Various sensors such as an oil temperature sensor 25 as an oil temperature detecting means to be detected are connected, and various actuators such as the clutch 12 and the inverter circuit 14 are connected to the output side of the ECU 21.
[0013]
Then, the ECU 21 executes a motor / generator control routine shown in FIG. 2 as a process for reducing idle noise. The details will be described below, but since the operation angle of the clutch disk is closely related to this control, the setting state of the operation angle will be described first according to the characteristic diagram of FIG.
FIG. 3 is an explanatory diagram showing the interrelationships of the torsional characteristics (a) of the clutch disk, the rotational resistance characteristics (b) of the transmission 1 with respect to the transmission oil temperature T, and the idle noise characteristics (c) with respect to the transmission oil temperature T. . As is well known, the main cause of idle noise is torsional vibration caused by rotational fluctuations (torque fluctuations) of the engine 6 as a vibration source, and between the input shaft 2 and the counter shaft 4 in the transmission 1 and between the counter shaft 4 and the main shaft. The gear meshing part such as three or the like is relatively displaced within the range of the backlash and generates a rattling sound due to tooth contact. As shown in FIG. 3A, the clutch disk at this time transmits the torsional vibration from the engine 6 while changing the operating angle θ positively or negatively around the neutral point.
[0014]
The occurrence of rattling noise differs depending on the specifications of the clutch disc and transmission 1 (for example, the clutch disk spring constant, the amount of backlash of the gear meshing portion, the mechanical rotational resistance of the transmission, etc.). Two factors due to the transmission oil temperature T are affected in the opposite direction. That is, when the oil viscosity decreases as the oil temperature T rises, the motion suppressing action on the gears decreases and affects the direction of increasing the rattling noise, while the oil viscosity is increased as shown in FIG. When the rotational resistance of the transmission 1 (acting on the clutch disk as a reaction force) decreases as the viscosity decreases, the operating angle of the clutch disk is easily suppressed within the first stage region with a small spring constant, and the teeth Affects the direction of sound reduction. Therefore, as these two factors influence each other, a minimum value of idle noise exists as shown in (c).
[0015]
If the oil temperature when the idle noise is at the minimum value (hereinafter referred to as the oil temperature at the time of minimum noise) is set to a frequently used oil temperature range, the opportunity for the idle noise to decrease to the minimum value is increased, and the Since the noise can be reduced, the specifications of the clutch disk and the transmission 1 are set so as to satisfy this condition. As a result, in this embodiment, as shown in the figure, Tmin is set as the oil temperature at the minimum noise, and θ is set as the operating angle of the clutch disk so that the noise becomes the minimum value at the oil temperature Tmin at the minimum noise. ing.
[0016]
On the other hand, the routine of FIG. 2 is executed at predetermined control intervals during the operation of the engine 6. First, in step S2, whether or not the vehicle speed V is 0 is determined. In step S4, the engine speed Ne is centered on the idle speed. In step S6, it is determined whether or not the gear position is neutral. If NO (No) is determined in any processing, the routine is ended after the clutch 12 is disconnected in step S8.
[0017]
Further, when the determination of YES is made in all the processes of steps S2 to 6, that is, the vehicle is stopped, the engine 6 is idling, the transmission 1 is neutral, and so-called rattling sound is generated. When all the conditions to be satisfied are satisfied, the process proceeds to step S10. In step S10, it is determined whether or not the oil temperature T of the transmission 1 is within a predetermined value Δt centered on the minimum noise oil temperature Tmin (Tmin−Δt ≦ T ≦ Tmin + Δt). The routine is terminated through S8.
[0018]
If the determination in step S10 is NO, the process proceeds to step S12 to connect the clutch 12, and in step S14, the target additional torque Mtgt is set from the oil temperature T according to the map shown in FIG. This map is obtained by replacing the rotational resistance of the transmission 1 with the target additional torque Mtgt based on the characteristic of (b) in FIG. In step S14, the target additional torque Mtgt corresponding to the minimum noise oil temperature Tmin is set to 0, and the target additional torque Mtgt is set to increase (positive side) as the oil temperature T rises based on this. Decrease setting (negative side) with decreasing.
[0019]
In the subsequent step S16, the sign of the target additional torque Mtgt is determined. If positive, the motor / generator 13 is operated as a motor by the inverter circuit 14 in step S18, and the target additional torque Mtgt is set to the counter shaft 4 of the transmission 1. Add corresponding driving force. When the target additional torque Mtgt is negative, the motor / generator 13 is operated as a motor in step S20 to apply a braking force corresponding to the target additional torque Mtgt to the counter shaft 4.
[0020]
As a result of the above control, when the actual oil temperature T is in the vicinity of the minimum noise oil temperature Tmin, as shown in FIG. 3, since the idle noise near the minimum value has already been achieved, the motor / generator 13 Control is not performed as unnecessary. On the other hand, when the oil temperature TLo is lower than the minimum noise oil temperature Tmin, the target addition torque Mtgt on the positive side is set according to the map of FIG. 4, and the increase in the rotational resistance of the transmission 1 due to the decrease in the oil temperature is the motor. / When the oil temperature THi is canceled by the drive of the generator 13 and is higher than the minimum noise oil temperature Tmin, the negative target additional torque Mtgt is set, and the rotational resistance of the transmission 1 due to the oil temperature rise is set. The decrease is offset by braking of the motor / generator 13.
[0021]
As described above, in the transmission noise reduction device of the present embodiment, the rotational resistance of the transmission 1 is reduced by the motor / generator 13 based on the unique idle noise characteristic (FIG. 3) determined from the specifications of the clutch disk and the transmission 1. The oil temperature Tmin is kept at the minimum noise level. Therefore, even if the oil temperature T increases or decreases, the operating angle of the clutch disk does not change to θLo or θHi corresponding to the oil temperatures TLo and THi but is maintained at the value θ at the time of the minimum noise oil temperature Tmin. As indicated by the broken line in (c), the idle noise can always be suppressed to the minimum value regardless of the oil temperature change.
[0022]
This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the noise reduction device is implemented for the transmission 1 with five forward speeds and one reverse speed. However, the specification of the transmission is not limited to this, for example, the number of gear stages, etc. May be changed. The same applies to the specifications of the clutch disk. For example, hysteresis may be given to the torsional characteristics.
[0023]
Moreover, in the said embodiment, in order to reduce a noise efficiently, the oil temperature Tmin at the time of minimum noise was set to the oil temperature range with high use frequency. This is the same as the conventional setting method, but the noise reduction device of the present invention can suppress idle noise to a minimum value even at a temperature other than the minimum noise oil temperature Tmin. The minimum noise oil temperature Tmin may be set by giving priority to the control.
[0024]
For example, as shown by the solid line in FIG. 5, when the minimum noise oil temperature Tmin is set to the lowest oil temperature in the normal range, the rotational resistance of the transmission 1 changes only in the decreasing direction as the oil temperature T increases. If the braking force is applied to the countershaft 4, idle noise can be suppressed to the minimum value. Conversely, as shown by the alternate long and short dash line, when the minimum noise oil temperature Tmin is set to the maximum oil temperature, the rotational resistance of the transmission 1 becomes oil. Since the temperature T changes only in the increasing direction, the idle noise can be suppressed to a minimum value by applying a driving force to the counter shaft 4. In these cases, it is only necessary to control the target additional torque Mtgt to either positive or negative, so that the control content can be simplified, and neither driving nor braking is required, so the motor / generator 13 is dedicated to braking. The cost can be reduced by substituting a generator or a dedicated motor for driving.
[0025]
Further, in the above embodiment, the motor / generator 13 is used to electrically generate a braking force. However, in the case where the motor / generator 13 is used exclusively for braking as described above, for example, Japanese Patent Laid-Open No. 7-259972 cited as the prior art. As in Japanese Patent Publication No. Gazette, a braking force may be generated mechanically using a brake shoe.
On the other hand, in the above embodiment, the torque of the motor / generator 13 is applied to the counter shaft 4. However, if the increase and decrease of the rotational resistance of the transmission 1 can be offset, the location where the torque is applied is limited to the counter shaft 4. It is not something. Therefore, for example, the torque of the motor / generator 13 may be applied to the idle gear 10 of either the input shaft 2 or the main shaft 3.
[0026]
【The invention's effect】
As described above, according to the transmission noise reduction device of the first aspect of the present invention, the idle noise is reliably reduced regardless of the oil temperature change on the premise of the idle noise characteristic based on the specifications of the transmission and the clutch disk. be able to.
According to the noise reduction apparatus for a transmission according to a second aspect of the invention, assuming the idle noise characteristics based on the specifications of the transmission and the clutch disc, it is possible reliably reduce idle noise regardless of the oil temperature changes, the motor By applying, simplification of control and cost reduction can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a noise reduction device for a transmission according to an embodiment.
FIG. 2 is a flowchart showing a motor / generator control routine executed by an ECU.
FIG. 3 is an explanatory diagram showing the interrelationships of clutch disk twist characteristics (a), transmission rotational resistance characteristics (b) with respect to transmission oil temperature, and idle noise characteristics (c) with respect to transmission oil temperature.
FIG. 4 is an explanatory diagram showing a map for setting a target additional torque from transmission oil temperature.
FIG. 5 is an explanatory view showing another example in which the oil temperature during minimum noise is set to the minimum oil temperature and the maximum oil temperature.
[Explanation of symbols]
1 Transmission
4 counter shaft (rotating part)
5 clutch 6 engine
1 3 Motor / Generator
2 1 ECU (torque control means)
25 Oil temperature sensor (oil temperature detection means)

Claims (2)

A transmission that inputs engine rotation via a connectable clutch;
A motor that is connected to the rotating part of the transmission and can apply torque in the same direction to the rotating part as it is driven, and can apply reverse torque to the rotating part as it is regenerated. / Generator and
Oil temperature detecting means for detecting the oil temperature of the transmission;
Torque control means for driving and controlling the motor / generator based on a unique idle noise characteristic determined from the specifications of the transmission and the clutch disk of the clutch and the oil temperature detected by the oil temperature detection means. A noise reduction device for a transmission characterized by the above. A transmission in which engine rotation is input via a connectable clutch, and idle noise characteristics are set so that idle noise becomes a minimum value at a substantially maximum oil temperature in the normal range,
A motor connected to the rotating portion of the transmission and capable of applying torque in the same direction to the rotating portion as it is driven;
Oil temperature detecting means for detecting the oil temperature of the transmission;
A transmission noise reduction device, comprising: torque control means for driving and controlling the motor based on the oil temperature detected by the oil temperature detection means.

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