KR100411048B1 - A variable mass flywheel system and a method for controlling thereof - Google Patents

Abstract

Rotational inertia can be adjusted according to the operating state of the engine or vehicle,

A first mass body fixedly mounted to the crankshaft; A second mass body mounted on an outer circumferential side of the crankshaft to allow relative rotation with the crankshaft and forward and backward in an axial direction; And coupling control means for controlling the coupling / disassembly of the second mass to the first mass.

In the variable mass flywheel system of the present invention configured as described above, the control unit receives the data regarding the operating state of the engine and the vehicle based on this to determine whether it is a low rotation area, in the case of the low rotation area, the first, A variable mass flywheel system control method is provided in which the mass control of the two masses is carried out, and the release of the first and the second masses is controlled in the case of not being in the low rotation region.

Description

Variable mass flywheel system and its control method {A VARIABLE MASS FLYWHEEL SYSTEM AND A METHOD FOR CONTROLLING THEREOF}

The present invention relates to a variable mass flywheel system and a control method thereof, and more particularly, to a flywheel system and a method of controlling the rotational inertia according to the operating state of the engine or vehicle.

As is well known, a flywheel is a device mounted on a crankshaft of an engine to absorb torsional vibration due to torque fluctuation of the engine.

The flywheel for the above functions is usually mounted on the crankshaft as a heavy mass rotating plate, so that the torque fluctuations transmitted through the crankshaft are reduced by the flywheel and transmitted to the transmission.

That is, even if a torsional vibration due to the torque fluctuation of the engine occurs, by mounting the flywheel with a large rotational inertia on the crankshaft so that the rotational change does not occur immediately by the vibration, the torsional vibration due to the torque fluctuation of the engine is transmitted to the transmission and other vehicle parts I do not want to.

The rotational inertia of the flywheel is set large so as to account for about 13% of the total rotational inertia of the rotating components driven and rotated from the engine.

By the way, the torque fluctuation is large because the time interval between the explosion stroke between the cylinder is large when the engine rotates at low speed, the torque fluctuation is large, on the contrary, when the engine rotates at high speed, the time interval between the explosion stroke is small, so the engine This smooth rotation causes the amount of fluctuation of the torque discharged from the crankshaft to be reduced.

By the way, the flywheel attached to the conventional crankshaft is comprised as a simple mass body, and therefore, as the engine rotates at high speed, the flywheel also rotates at high speed.

Therefore, in order to increase the engine speed, a large proportion of the torque of the engine is used as the torque for rotating the flywheel at high speed, and in order to rapidly increase the engine speed, a large proportion of the torque discharged from the engine is lost in the flywheel. As a result, the acceleration response of the engine is slowed, and during high speed driving, the high rotational inertia of the flywheel causes a lot of loss of engine power.

Accordingly, the present invention is to reduce the output loss of the engine due to the flywheel, an object of the present invention is to provide a flywheel system and a control method of which the rotational inertia is adjusted according to the operating state of the engine or vehicle.

1 is a block diagram of a variable mass flywheel system according to an embodiment of the present invention.

2 is a flowchart illustrating a control method of a variable mass flywheel system according to an exemplary embodiment of the present invention.

Variable mass flywheel system according to the present invention to achieve the above object,

A first mass body fixedly mounted to the crankshaft; A second mass body mounted on an outer circumferential side of the crankshaft to allow relative rotation with the crankshaft and forward and backward in an axial direction; And coupling control means for controlling coupling / disassembly of the second mass to the first mass.

When the second mass is mounted on the outer circumferential side of the crankshaft, it is mounted via a bearing.

The engagement control means includes a forward and backward operation device for forward and backward operation of the second mass; A friction member disposed between the second mass and the first mass to generate contact frictional force; And a control unit which detects a driving state of the vehicle and controls the operation of the forward and backward operating device based on the driving state of the vehicle.

The forward and backward operation apparatus may include: a hydraulic cylinder installed in a housing of the crankshaft and operated by hydraulic pressure to move the second mass body toward the first mass body; An oil pump for supplying hydraulic pressure to the hydraulic cylinder; A solenoid valve installed on a hydraulic pipe connecting the oil pump and the hydraulic cylinder to open and control the hydraulic pipe; And elastic means installed between the first mass body and the second mass body via a bearing, wherein the control unit controls the solenoid valve on / off.

It is preferable that a lever device is provided between the hydraulic cylinder and the second mass.

The lever device, the hinge portion is installed in the housing of the crankshaft; A lever coupled to one end of the hinge to be rotatable and the other end coupled to the hydraulic cylinder; And a release bearing installed at a central portion of the lever to suppress rotational friction with the second mass during the forward operation of the second mass.

In addition, in the variable mass flywheel system control method according to the present invention, in the variable mass flywheel system of the present invention configured as described above, the control unit receives data on an operating state of the engine and the vehicle based on the low rotation area In the case of the low rotation region, the first and second masses are controlled to be coupled, and when not, the first and second masses are controlled to be released.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a variable mass flywheel system according to an embodiment of the present invention.

As shown in Figure 1, the variable mass flywheel system of the embodiment of the present invention,

A first mass body 110 fixedly mounted to the crankshaft 105; A second mass body (120) mounted on an outer circumferential side of the crank shaft (105) so as to allow relative rotation with the crank shaft (105) and forward and backward in an axial direction; And coupling control means for controlling coupling and disengagement of the second mass body 120 and the first mass body 110.

The first mass 110 is fixed to the crankshaft 105 with a bolt 115, like the normal flywheel, and the second mass 120 is located at the rear side of the first mass 110. 105) is mounted to the outer circumferential side, and at this time, the crankshaft 105 and the second mass 120 are disposed relative to the crankshaft 105 through a bearing 125 (hereinafter referred to as a "rotary bearing"). Make it possible to rotate.

In addition, the rotary bearing 125 and the second mass 120 are coupled in a spline structure so that the second mass 120 may move forward and backward on the rotary bearing 125.

As the coupling control means, a forward and backward operation device for operating the second mass body 120 forward and backward, and a friction member provided between the second mass body 120 and the first mass body 110 to generate contact frictional force. 130; And a control unit 185 for controlling the operation of the forward and backward operating device,

The forward and backward operation device, the hydraulic cylinder 150 is installed in the housing 190 of the crankshaft 105 to operate by hydraulic pressure to pre-operate the second mass 120 toward the first mass (110); An oil pump 170 for supplying hydraulic pressure to the hydraulic cylinder 150; A solenoid valve 180 installed on a hydraulic pipe line 175 connecting the oil pump 170 and the hydraulic cylinder 150 to control the opening and closing of the hydraulic pipe line 175; And an elastic means 135 installed between the first mass body 110 and the second mass body 120 via a bearing 140 (hereinafter referred to as an elastic means bearing).

The control unit 185 is connected to any control unit including a processor connected to control the on / off of the solenoid valve 180 in the forward and backward operating device configured as described above, and to perform a predetermined series of steps. can do.

The control unit 185 is connected to an operation state detection unit 195 for detecting an operation state of an engine and a vehicle, and receives data for performing the series of steps, and the operation state detection unit 195 receives a throttle valve opening amount. And a throttle valve opening degree detection means 196 for detecting a vehicle speed, a vehicle speed detection means 197 for detecting a vehicle speed, and an intake air amount detection means 198 for detecting an intake air amount.

The friction member 130 may be installed on either the first mass body 110 or the second mass body 120. In FIG. 1, the friction member 130 is illustrated as being installed on the second mass body 120 as an example.

The oil pump 170 may be any pump for generating oil hydraulic pressure, for example, may be a power steering pump.

The elastic means 135 may be any elastic means for forming a restoring force when the second mass 120 is compressed by advancing, for example, may be a compression coil spring. The elastic means 135 may be provided on either the first mass body 110 or the second mass body 120. In FIG. 1, the elastic means 135 is illustrated as being installed on the second mass body 120 as an example.

The elastic means 135 is mounted on the elastic means 135 so that friction and deformation of the elastic means due to the difference in rotational speed when the first mass 110 and the second mass 120 are coupled are suppressed.

In order to increase the forward force for advancing the second mass 120 by the hydraulic cylinder 150 is configured in the embodiment of the present invention further comprises a lever device.

The lever device, the hinge portion 165 is installed on the housing 190 of the crankshaft 105, one end is hinged to the hinge portion 165 and the other end is coupled to the lever (hydraulic cylinder 150) 155 is installed, and a bearing 160 (hereinafter referred to as a "release bearing") for suppressing rotational friction with the second mass 120 is mounted at the center of the lever 155.

Looking at the operation of the variable mass flywheel system of the embodiment of the present invention configured as described above are as follows.

In a situation where the rotational inertia of the flywheel, such as a high speed rotation, is required to be small, as shown in FIG. 1, the first and second mass bodies 110 and 120 are spaced apart from each other, and the rotational force output from the crankshaft 105 is determined by the first mass body ( Only transmitted to 110, the second mass 120 is free to rotate on the crankshaft 105.

In this state, the solenoid valve 180 is opened, and the oil supplied from the oil pump 170 is circulated through the solenoid valve 180, so that no hydraulic pressure is formed, so the hydraulic cylinder 150 is not operated. Is maintained.

At this time, if it is determined that the torque fluctuation of the engine is a severe driving state, such as idling, the control unit 185 closes the solenoid valve 180, accordingly the hydraulic pressure generated in the oil pump 170 The hydraulic cylinder 150 is supplied to the hydraulic cylinder 150 to move the lever 155 forward.

Therefore, when the lever 155 is in contact with the second mass 120 to move the second mass 120 forward, the second mass 120 is advanced to come into contact with the first mass 110 and the friction Since the first and second masses 110 and 120 are combined and rotated integrally by the frictional force of the member 130, the rotational inertia becomes large.

In a situation where the rotational inertia is required to be small again, the control unit 185 opens the solenoid valve 180.

Accordingly, the flow path is opened to release the hydraulic pressure of the hydraulic cylinder 150, and the second mass 120 is reversed by the restoring force of the elastic means 135, thereby coupling the first and second mass bodies 110 and 120. This will be released.

2 is a flowchart illustrating a control method of a variable mass flywheel system according to an exemplary embodiment of the present invention.

As shown in FIG. 2, in the method of operating the variable mass flywheel system according to the exemplary embodiment of the present invention, the control unit 185 first receives data about an operating state from the operating state detector 195 (S210).

For example, the data on the vehicle operating state includes the throttle valve opening amount, the vehicle speed, and the intake air amount.

After receiving the operation state data, it is determined whether the low rotation area based on the data (S220).

The low rotation area determination may be judged by any criterion determined that the rotational inertia of the flywheel needs to be large, for example, the throttle valve opening is off, the vehicle speed is 0, and the intake air amount is determined. If it is 0, it can be determined that it is a low rotation area.

When it is determined in the low rotation area determination (S220) that the low rotation area is determined, the control unit 185 controls to combine the first and second masses 110 and 120 (S230).

The coupling control may be performed by the control unit 185 closing the solenoid valve 180.

When it is determined in the low rotation area determination (S220) that the low rotation area is not determined, the control unit 185 controls the coupling of the first and second masses 110 and 120 to be released (S240).

The disengagement control may be performed by the control unit 185 opening the solenoid valve 180.

After controlling the operation of the solenoid valve 180 according to the result of the low rotation area determination (S220), the operation state data input step (S210) is performed.

As mentioned above, although the preferred embodiment regarding the variable mass flywheel system of the present invention and its control method has been described, the present invention is not limited to the above embodiment, and the general knowledge in the technical field to which the present invention pertains from the embodiment of the present invention. It includes all changes to the extent that they are readily changed by the possessor and are considered equivalent.

According to an embodiment of the present invention, since the rotational inertia of the flywheel can be set according to the engine and the vehicle operating state in which the amount of torque output from the engine is severe or small, the torsional vibration due to the torque variation of the engine is reduced in the low rotation region. The transmission can be reduced, and in the high rotation region, the rotational inertia of the flywheel can be reduced to improve the acceleration performance.

Claims (8)

delete delete delete A first mass fixedly mounted to the crankshaft; A second mass body mounted on the outer circumferential side of the crankshaft via a bearing to allow relative rotation with the crankshaft and forward and backward axial directions; A hydraulic cylinder installed in the housing of the crankshaft and operated by hydraulic pressure to move the second mass toward the first mass; An oil pump for supplying hydraulic pressure to the hydraulic cylinder; A solenoid valve installed on a hydraulic pipe connecting the oil pump and the hydraulic cylinder to open and control the hydraulic pipe; And Elastic means provided between the first mass and the second mass via a bearing; A friction member disposed between the second mass and the first mass to generate contact frictional force; And And a control unit which detects a driving state of a vehicle and controls the operation of the forward and backward operation apparatus by controlling the solenoid valve on / off based on the driving state of the vehicle. In claim 4, A lever device is provided between the hydraulic cylinder and the second mass body, The lever device, A hinge part installed in the housing of the crankshaft; A lever coupled to one end of the hinge to be rotatable and the other end coupled to the hydraulic cylinder; And A release bearing installed in the center of the lever to suppress rotational friction with the second mass in the forward movement of the second mass Variable mass flywheel system comprising a. The method of claim 4 or 5, The control unit receives the data regarding the operating state of the engine and the vehicle based on it and determines whether it is a low rotation area, in the case of a low rotation area, the first and second masses are combined control and, if not a low rotation area The variable mass flywheel system, characterized in that for controlling the release of the first and second masses. delete A method for controlling the variable mass flywheel system of any one of claims 4 and 5, A data input step of receiving data including a throttle valve opening amount, a vehicle speed, and an intake air amount; A low rotation determination step of determining that the throttle valve opening degree is off, the vehicle speed is 0, and the intake air amount is 0; Jointly controlling the first and second masses when the low rotation region is determined in the low rotation determination step; And And if it is determined in the low rotation determination step that the low rotation region is not the low rotation region, controlling the release of the first and second masses.