KR100828766B1 - Method for preventing damage of dual mass flywheel in impact torque for vehicle - Google Patents

Abstract

A method for preventing breakage of a DMF(Dual Mass Flywheel) in impact torque for a vehicle is provided to restrain the decrease of startability or the increase of particulate matter by the existing injection timing recognition method, by controlling the amount of idle fuel or torque. A method for preventing breakage of a DMF in impact torque for a vehicle comprises the steps of: detecting whether the change rate of input RPM(Revolution Per Minute) is over the reference change level or not, if difference between the input RPM and idle RPM is below 100 RPM, and then judging whether impact torque of the DMF is generated or not(S1,S2); judging whether acceleration opening degree is over reference opening degree or not, if the change rate of input RPM is over the reference change level(S3); controlling torque by operating the vehicle in a creeping mode while the vehicle is kept in an idle status, if acceleration opening degree is over reference opening degree(S4); judging whether a brake switch is turned on or not, if the acceleration opening degree is below reference opening degree(S6); and operating the vehicle in an idle fuel control mode if the brake switch is turned on(S7).

Description

How to prevent damage of dual mass flywheel during impact torque of car {METHOD FOR PREVENTING DAMAGE OF DUAL MASS FLYWHEEL IN IMPACT TORQUE FOR VEHICLE}

1 is a view showing a method of preventing breakage of a dual mass flywheel (DMF) during impact torque of a vehicle according to the present invention.

The present invention relates to a method of preventing damage of a dual mass flywheel (DMF) during impact torque of an automobile, and more particularly, to prevent damage of a dual mass flywheel by using fuel amount and torque amount control during impact torque transmission. It is about the method which can prevent.

In general, as consumers' demands for comfort and quietness for automobiles increase and awareness of vibration noise increases, studies on vibration noise reduction have been actively conducted in terms of customer satisfaction. However, research and development such as weight reduction promotion and high engine output for improving the power performance and fuel efficiency of automobiles are very disadvantageous in terms of reducing vibration noise of the vehicle, and measures for this have been taken. Vibration noise of the vehicle drive system is adversely affected by the irregular torque fluctuation generated in the engine is transmitted to the drive system to vibrate the entire vehicle. Currently, as a method of reducing vibration noise of a drive system, a dual mass flywheel (DMF) system is applied to minimize a torque variation generated in an engine when it is transmitted to the drive system.

In general, a condition in which DMF impact torque occurs is that a peak impact torque occurs due to a peak acceleration when the clutch is suddenly stopped.In a car, when the brake is turned off by breaking at a high stage (3/4/5 stage) or a high stage ( 3/4/5 stages), when the stepped on the accelerator when the ALMP (rpm) falls below the idle ALPM (rpm) by breaking the peak impact torque occurs to break the DMF.

Accordingly, as an improvement of impact torque, conventionally, an idle fuel amount (low rpm fuel amount) limitation and injection timing perception method are used. However, such injection timing perception method has a problem of poor startability and an increase in particulate matter.

Accordingly, it is an object of the present invention to provide a method capable of preventing breakage of a dual mass flywheel during impact torque of a motor vehicle which has good startability and does not cause an increase in particulate matter.

The above object is, according to the present invention, in the method of preventing damage of the dual mass flywheel during impact torque of the vehicle, (a) if the difference between the input rpm (rpm) and the idle rpm (idm rpm) is less than 100 alpha (rpm), Determining whether the dual mass flywheel (DMF) impact torque is generated by detecting whether or not the input ALPM variation Δrpm during Δt is greater than or equal to the reference variation amount; (b) determining whether the Excel opening amount is greater than or equal to the reference opening amount, when the amount of ALPM (Δrpm) input during Δt in step (a) is greater than or equal to the reference variation amount; (c) controlling the torque amount by driving the vehicle in a creeping driving mode while maintaining the idle state if the Excel opening amount is greater than or equal to the reference opening amount in step (b); (d) determining whether the brake switch is on if the Excel opening amount is less than the reference opening amount in step (b); (e) if the brake switch is turned on in step (d), the step of driving to an idle fuel amount control mode.

Here, in the step (c), it is preferable that the vehicle is driven in the creeping driving mode, and then operated in the normal driving mode after a predetermined time or when the gear is changed.

The reference fluctuation amount is preferably 300 alpha rpm.

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

1 is a view showing a method of preventing breakage of a dual mass flywheel (DMF) during impact torque of a vehicle according to the present invention.

The method according to the present invention is to prevent the breakage of the dual mass flywheel (DMF) by using the behavior of arpm (rpm), first if the difference between the input rpm (idm) and the idle rpm (idle rpm) is less than 100 rpm ( S1), it is detected whether the amount of variation Δrpm input during Δt is greater than or equal to the reference variation and determines whether the dual mass flywheel (DMF) impact torque is generated (S2). That is, when the clutch suddenly drops, the peak impact torque is generated by the peak acceleration. When the peak impact torque is generated in this way, the behavior of the rpm is over a wide range. Here, the reference variation amount is set to 300 rpm, but is not limited thereto and may vary depending on the situation of the system.

When the amount of variation Δrpm input during Δt in step S1 is 300 rpm or more, it is determined whether the opening amount of Excel is greater than or equal to the reference opening amount (S3). That is, since the driving torque is determined according to the Excel opening amount, it is to determine the value according to the impact amount of the DMF.

As a result of the above (S3), when the accelerator opening amount is equal to or greater than the reference opening amount, the vehicle is driven in the creeping driving mode while maintaining the idle state (S4). As such, when driving in a creeping state without turning off the engine, when the vehicle in front of the five-speed intermediate speed decreases in the roundabout, the user applies the brake to drop the rpm below the idle rpm. If the ignition is turned off, the creeping drive can be performed without turning off the ignition because it can cause an accident. Thereafter, when a predetermined time passes or the gear is changed, the vehicle is driven in the normal driving mode (S5).

 On the other hand, if the result of the accelerator opening amount (S3) is less than the reference opening amount, it is determined whether the brake switch is on (S6). Here, the start is turned off when the accelerator opening amount is less than the reference opening amount and the breach switch is on, and the impact torque amount generated at this time is smaller than when the user presses the accelerator as in the step (S4). Therefore, by gradually reducing the idle fuel amount to stop the start to prevent damage to the DMF (S7), if the user presses the brake for a short time by mistake of operation of the user to operate in the normal driving mode conditions to end the logic (S8).

With this configuration, if you are driving abnormally (i.e., if you brake on the high stage (3/4/5 stage) or when you brake on the high stage (3/4/5), you can press the excel again to start) Can be prevented from damaging the DMF. In addition, by not using the conventional injection timing perception method, problems such as deterioration in startability or increase in particulate matter can be solved.

As described above, according to the present invention, the impact torque of a vehicle which can solve the problem of deterioration of startability or increase of particulate matter by the conventional injection timing perception method by preventing DMF damage by adjusting the amount of idle fuel or torque. A method of preventing breakage of a DMF is provided.

Claims (3)

(a) If the difference between the input rpm and idle rpm is less than 100 rpm, the dual mass flywheel (DMF) is detected by detecting whether the input variation of the PM is greater than or equal to the reference variation. Determining whether impact torque is generated; (b) determining whether the Excel opening amount is greater than or equal to the reference opening amount when the input ALPM Δrpm is greater than or equal to the reference variation amount in step (a); (c) controlling the torque amount by driving the vehicle in a creeping driving mode while maintaining the idle state if the Excel opening amount is greater than or equal to the reference opening amount in step (b); (d) determining whether the brake switch is on if the Excel opening amount is less than the reference opening amount in step (b); and (e) operating in an idle fuel amount control mode if the brake switch is turned on in the step (d). The method of claim 1, In (c), the vehicle is driven in the creeping driving mode, and then after a predetermined time or when the gear changes, the damage prevention method of the DMF during the impact torque of the vehicle, characterized in that the operation. The method of claim 1, The reference fluctuation amount is 300 Alp (rpm) characterized in that the damage prevention method of the DMF when the impact torque of the vehicle.

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