JP3997944B2 - Method for reducing gear rattling noise of drive train gear unit in hybrid vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reducing the rattling noise of a drive train gear device in a hybrid vehicle, and more specifically, the rattling noise of a drive train gear device in a hybrid vehicle capable of reducing the rattling noise of the drive train gear device by control of a motor generator. It relates to a reduction method.
[0002]
[Prior art]
In recent years, hybrid vehicles have been developed from the viewpoint of conservation of the global environment and resource saving. This hybrid vehicle is configured such that a wheel drive shaft can be driven by an engine, a motor generator, or both via a drive system gear device. This motor generator is configured to be capable of taking two operating states: a power running mode that functions as a motor that is a travel drive source, and a regenerative mode that functions as a generator.
[0003]
That is, the hybrid vehicle is controlled so that the driving efficiency is increased by properly using the driving force by the engine and the driving force by the motor generator according to the traveling state. For example, at low speeds (low rotation) or low loads such as when starting, the engine efficiency is poor. Therefore, the engine is stopped and the vehicle is driven only by the motor generator. During normal driving, both the engine and the motor generator are driven by the wheel drive shaft. Is controlled to drive.
[0004]
In order to realize such an operation mode, the engine (including the transmission) and the motor generator are configured such that one driving force can be transmitted to the other via the driving system gear device. Hereinafter, a hybrid vehicle, which is a front-wheel drive vehicle (FF vehicle) in which an engine is disposed at the front of the vehicle, a motor generator is disposed at the rear of the vehicle, and both are connected via a propeller shaft and a drive system gear device, is taken as an example. explain.
[0005]
For example, the drive train gear device has a configuration as shown in FIG. Here, FIG. 3 is a schematic diagram showing the internal configuration of the drive train gear unit integrated with the motor generator. As shown in FIG. 3, gears 44, 45, 46, 47 are provided on the shafts 41, 42, 43 of the drive system gear unit 37 integrated with the motor generator 17. 43 is supported by each bearing 50.
[0006]
The shaft 43 is connected to a propeller shaft (not shown). The tip of the propeller shaft is connected to a transfer (not shown) provided on the wheel drive shaft (drive shaft).
[0007]
The motor generator 17 is configured to operate in the regenerative operation mode via the drive system gear unit 37 or to perform engine torque assist in the power running operation mode.
[0008]
[Problems to be solved by the invention]
However, in the conventional hybrid vehicle, when the rotational fluctuation is transmitted from the engine or the wheel drive shaft to the drive system gear unit 37, the backlash generated between the gears 44 and 45 and between the gears 46 and 47 is generated in a predetermined rotational speed range. There has been a problem that a rattling sound is generated based on this.
[0009]
In addition, there is a technique proposed as a rattling noise reduction means for a drive train gear device (see, for example, Patent Document 1 and Patent Document 2), but specific solution means utilizing the control of a motor generator in a hybrid vehicle is disclosed. It has not been.
[0010]
[Patent Document 1]
Japanese Patent No. 3262646 [Patent Document 2]
Japanese Patent No. 3291235 [0011]
The present invention has been made in view of the above, and an object of the present invention is to provide a driving system gear unit rattling noise reduction method in a hybrid vehicle that can reduce the rattling noise of the driving system gear unit by control of a motor generator. And
[0012]
[Means for Solving the Problems]
In order to achieve the above-described object, a method for reducing the rattling noise of a drive train gear device in a hybrid vehicle according to the present invention is configured such that a wheel drive shaft can be driven by an engine, a motor generator, or both via a drive train gear device. In the method for reducing the rattling noise of the driving system gear device in the hybrid vehicle, when the rattling noise is generated in the driving system gear device, the remaining capacity of the driving battery of the motor generator is larger than a predetermined value. is the motor-generator is controlled to power running side to extinguish the rattle, when the remaining capacity of the battery is below a predetermined value the motor-generator controls the regeneration side to extinguish the rattle When the motor generator is controlled to the power running side, the sum of output torques of the engine and the motor generator is The engine output is controlled so as to be equal to the required torque, and when the motor generator is controlled to the regeneration side, the engine and the motor generator so that the sum of output torques of the engine and the motor generator becomes equal to the required torque. The output is controlled to increase .
[0013]
Therefore, according to the present invention, the operating state of the motor generator can be determined based on the remaining capacity of the battery, and the rotational direction of the gear of the drive train gear device can be determined. Then, by controlling the rotation of the motor generator in a direction that reduces backlash generated between the gears, it is possible to reduce rattling noise.
[0014]
In the method for reducing the rattling noise of the drive train gear device in the hybrid vehicle according to the present invention, the engine is a diesel engine .
[0015]
Therefore, according to the present invention, the required driving force from the wheel drive shaft can be maintained without excess or deficiency by adjusting the engine output, so that the driver can comfortably drive without feeling torque fluctuation.
[0016]
Further, in the method for reducing the rattling noise of the drive system gear device in the hybrid vehicle according to the present invention, the control of the motor generator to the regeneration side or the control to the power running side generates a rattling noise in the drive system gear device. It is characterized by being executed only in a predetermined rotation speed region.
[0017]
Therefore, according to the present invention, it is only necessary to control the motor generator only in a predetermined rotation speed region where the rattling noise is generated, and the rattling noise can be efficiently reduced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
[0019]
FIG. 1 is a schematic diagram showing a schematic configuration of a diesel hybrid vehicle according to an embodiment of the present invention. First, a schematic configuration of a diesel hybrid vehicle 10 that is a front wheel drive vehicle (FF vehicle) will be described with reference to FIG. The diesel hybrid vehicle 10 is provided with a diesel engine 11 as a travel drive source at the front of the vehicle. In the diesel engine 11, the fuel injection amount is controlled by a common rail fuel injection system (not shown).
[0020]
The diesel engine 11 includes a turbocharger (not shown). Furthermore, a particulate filter carrying a NOx catalyst is provided in the exhaust passage of the diesel engine 11 to purify diesel particulates and NOx in the exhaust gas (not shown).
[0021]
The driving force generated by the diesel engine 11 is transmitted to a front wheel 13 as a main driving wheel via a multimode transmission (MMT) 12 and a drive shaft 14. The multi-mode transmission 12 automatically and electrically controls a gear shift operation with an actuator in accordance with a traveling state. That is, no torque converter is mounted.
[0022]
In addition, the diesel hybrid vehicle 10 is provided with a clutch 12a that performs contact / separation of power transmission between the diesel engine 11 and the stepped transmission of the multi-mode transmission 12, and the contact / separation operation is performed by an actuator according to the traveling state. It is designed to be automatically controlled electrically.
[0023]
Also, a propeller shaft 16 is connected to the transfer 15 that transmits the driving force separately, and a motor generator (MG) 17 integrated with a drive system gear device (gear train) 37 (see FIG. 3) is connected to the end of the transfer shaft. Has been. The motor generator 17 is rotated by the diesel engine 11 via the propeller shaft 16 and the drive system gear unit 37. In addition, the rear wheel 18 is configured to be rotated only by the front wheel 13 that is a driving wheel.
[0024]
The motor generator 17 is connected via an inverter 19 to a battery 20 that is a chargeable / dischargeable secondary battery. Further, the motor generator 17 is configured to be able to take two operation states, a power running operation mode that functions as a motor that is a travel drive source, and a regenerative operation mode that functions as a generator.
[0025]
For example, the motor generator 17 receives power supplied from the battery 20 in the power running operation mode and generates power for driving the drive shaft 14 via the propeller shaft 16. In the regenerative operation mode, the motor generator 17 converts the driving force transmitted from the diesel engine 11 or the drive shaft 14 via the propeller shaft 16 into electric power, and charges the battery 20.
[0026]
Whether the motor generator 17 is operated in the power running mode or the regenerative operation mode is determined in consideration of the state of charge (SOC) of the battery 20. This state of charge SOC is monitored by a voltage sensor.
[0027]
The diesel hybrid vehicle 10 configured as described above is basically controlled as follows together with each component by an electronic control unit (ECU) (not shown), and can travel in various states. For example, in a relatively low speed state in which the diesel hybrid vehicle 10 starts traveling, the vehicle travels (EV traveling) by powering the motor generator 17 while the diesel engine 11 is stopped.
[0028]
When the diesel hybrid vehicle 10 reaches a predetermined speed after the start of traveling, the diesel engine 11 is cranked and started using the motor generator 17, and the operation is shifted to the operation using the diesel engine 11. During steady operation, the diesel engine 11 is normally operated so as to generate an output substantially equal to the required power of the drive shaft 14. At this time, almost all of the output of the diesel engine 11 is transmitted to the drive shaft 14.
[0029]
On the other hand, when the state of charge SOC of the battery 20 has dropped below a predetermined reference value, the diesel engine 11 is operated with an output that exceeds the required power of the drive shaft 14, and a part of the surplus power is a motor. It is regenerated as electric power by the generator 17 and used for charging the battery 20. Further, when the torque of the diesel engine 11 is insufficient, the insufficient torque is assisted by driving the motor generator 17, and the necessary torque can be ensured.
[0030]
The diesel hybrid vehicle 10 is also subjected to so-called eco-run (economy & ecology running) control in order to save fuel and reduce exhaust emissions. That is, for example, when the diesel hybrid vehicle 10 stops due to a signal waiting at an intersection or the like, the diesel engine 11 is automatically stopped under a predetermined stop condition, and then the predetermined restart condition (for example, the accelerator pedal is depressed). At a time), the diesel engine 11 is also restarted.
[0031]
The above is the basic configuration and basic control operation of the diesel hybrid vehicle 10 according to the present invention.
[0032]
Next, a method for reducing rattling noise, which is a main part of the present invention, will be described with reference to FIG. Here, FIG. 2 is a flowchart showing a control operation for reducing rattling noise.
[0033]
As described above, the motor generator 17 is connected to the drive shaft 14 via the propeller shaft 16 and is rotated when only the diesel engine 11 is driven. Accordingly, the rotational fluctuation from the diesel engine 11 or the front wheel 13 is transmitted to the drive system gear unit 37 (see FIG. 3) integrated with the motor generator 17 via the propeller shaft 16.
[0034]
It has been confirmed that the rattling noise based on the backlash generated between the gears 44 and 45 of the drive system gear unit 37 and between the gears 46 and 47 is generated when a predetermined rotational speed region is reached. Therefore, the following control is performed in such a rotational speed region, and the rattling noise is efficiently reduced.
[0035]
As shown in FIG. 2, when a rattling sound is generated (step S10), when the state of charge SOC of the battery 20 is larger than a reference value (lower limit value) where the use of the battery 20 cannot be permitted (Yes in step S11), that is, When the remaining amount of the battery 20 has a margin, the motor generator 17 is controlled to be in the power running operation mode in order to reduce the rattling noise by operating in the direction in which the backlash is reduced (step S12).
[0036]
At this time, in order not to exceed the required torque from the drive shaft 14 side, the output of the diesel engine 11 is suppressed (step S13), and the total driving force from the motor generator 17 and the diesel engine 11 is equal to the required torque. Adjust to be equal.
[0037]
Thereby, the driver can drive comfortably without feeling torque fluctuation. These controls (step S11, step S12, and step S13) are performed for a predetermined time until the rattling noise is reduced.
[0038]
On the other hand, when the remaining amount of the battery 20 is not sufficient (No at Step S11), the motor generator 17 is controlled to be in the regenerative operation mode in order to reduce the rattling noise by operating in the direction in which the backlash is reduced. (Step S14).
[0039]
At this time, the output of the diesel engine 11 is increased so that the required torque from the drive shaft 14 side is not insufficient (step S15), and the total driving force from the motor generator 17 and the diesel engine 11 becomes equal to the required torque. Adjust to.
[0040]
Thereby, the driver can drive comfortably without feeling torque fluctuation. These controls (step S11, step S14, step S15) are performed for a predetermined time until the rattling noise is reduced.
[0041]
As described above, according to the rattling noise reduction method of the drive train gear device in the hybrid vehicle according to this embodiment, when the ratchet noise is generated in the drive train gear device 37, the remaining capacity of the battery 20 has a margin. In some cases, the motor generator 17 is controlled to the power running side to suppress the output of the diesel engine 11, and when the remaining capacity of the battery 20 is not sufficient, the motor generator 17 is controlled to the regeneration side to output the diesel engine 11. Therefore, backlash generated between the gears 44 and 45 of the drive system gear unit 37 and between the gears 46 and 47 is reduced while maintaining the driving force necessary for traveling, and the rattling noise is reduced. be able to.
[0042]
Further, since the motor generator 17 performs the control to the power running side or the regeneration side and the output control of the diesel engine 11 in a predetermined rotation speed region where the rattling noise is generated, the rattling noise is efficiently reduced. be able to.
[0043]
In the above embodiment, the example in which the present invention is applied to the diesel hybrid vehicle 10 of the front wheel drive vehicle (FF vehicle) has been described. However, the present invention is not limited to this, and may be applied to other hybrid vehicles. The same effect as above can be expected.
[0044]
Further, the coupling mode of the propeller shaft 16 and the drive system gear device 37 that mutually transmit the driving force of the diesel engine 11 and the motor generator 17 is not limited to the above-described example, and various coupling modes using known means are adopted. it can.
[0045]
【The invention's effect】
As described above, according to the method for reducing the rattling noise of the drive train gear device in the hybrid vehicle according to the present invention, the wheel drive shaft is configured to be driven by the engine, the motor generator, or both via the drive train gear device. In the method for reducing the rattling noise of the drive system gear device in a hybrid vehicle, when the rattling noise is generated in the drive system gear device, if the remaining capacity of the drive battery of the motor generator has a margin, the motor generator When the remaining capacity of the battery is not sufficient, the motor generator is controlled to the regenerative side. Therefore, the operation state of the motor generator is determined based on the remaining capacity of the battery. The motor generator can be used to determine the rotational direction of the gears of the system gear unit and reduce backlash. Rotation may be controlled to reduce the rattling noise.
[0046]
Further, according to the rattling noise reduction method for a drive train gear device in a hybrid vehicle according to the present invention, when the motor generator is controlled to the regeneration side, the output of the engine is increased and the motor generator is driven to the power running side. When the control is performed, the engine output is suppressed. Therefore, by adjusting the engine output, the required driving force from the wheel drive shaft can be maintained without excess or deficiency, and the driver feels torque fluctuation. You can drive comfortably.
[0047]
According to the method for reducing the rattling noise of the drive system gear device in the hybrid vehicle according to the present invention, the control of the motor generator to the regeneration side or the control to the power running side is executed in a predetermined rotation speed region. Therefore, it is sufficient to control the motor generator only in a predetermined rotation speed region where the rattling noise is generated, and the rattling noise can be efficiently reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a schematic configuration of a diesel hybrid vehicle according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a control operation for reducing rattling noise.
FIG. 3 is a schematic diagram showing an internal configuration of a drive train gear device integrated with a motor generator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Diesel hybrid vehicle 11 Diesel engine 12 Multi-mode transmission 12a Clutch 13 Front wheel 14 Drive shaft 15 Transfer 16 Propeller shaft 17 Motor generator 18 Rear wheel 19 Inverter 20 Battery 37 Drive system gear apparatus 41, 42, 43 Shafts 44, 45, 46, 47 Gear 50 Bearing

Claims (3)

In a method for reducing the rattling noise of a drive system gear device in a hybrid vehicle configured such that a wheel drive shaft can be driven by an engine, a motor generator or both via a drive system gear device,
When a rattling noise is generated in the drive system gear unit, if the remaining capacity of the driving battery for the motor generator is larger than a predetermined value, the motor generator is controlled to the power running side in order to eliminate the rattling noise. When the remaining capacity of the battery is equal to or less than a predetermined value, the motor generator is controlled to the regeneration side to eliminate the rattling noise, and when the motor generator is controlled to the power running side, the engine and the motor When the engine output is controlled so that the sum of the output torques of the generator is equal to the required torque, and the motor generator is controlled to the regeneration side, the sum of the output torques of the engine and the motor generator is the required torque. hybrid vehicle and controls to increase the equals the engine output as a Rattle reduction method definitive driveline gear. The method according to claim 1, wherein the engine is a diesel engine . The control to the regeneration side or the power running side of the motor generator is executed in a predetermined rotation speed region where a rattling sound is generated in the drive train gear device. Method for reducing gear rattling noise of a drive train gear device in a hybrid vehicle.

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