KR20170001894A - Method for controlling hybrid vehicle with dct - Google Patents

Abstract

The present invention comprises: a condition understanding step of determining a condition in which a vehicle can be driven by only a motor by means of a controller; a first gear securing step of enabling all gears of an even-numbered shaft to be in a release state by means of the controller when a vehicle can be driven by only a motor for an R range to be selected, and enabling a first gear of an odd-numbered shaft to be in a coupled state; and a motor reverse step of realizing backward driving by enabling the motor to be driven in a direction opposite to first gear driving by means of the controller after the first gear securing step.

Description

{METHOD FOR CONTROLLING HYBRID VEHICLE WITH DCT}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a control method of a hybrid vehicle equipped with a DCT, and more particularly, to a shift control according to a switching operation between a D-range and an R-range by a driver.

The DCT (Dual Clutch Transmission) has a large number of diagnoses and a single diagnosis, and the input shaft receiving the rotational force from one of the two clutches is configured to form an odd number of shift stages and receives the rotational force from the other. The input shaft used for forming the odd-numbered gear stage is referred to as an even-number shafting, the even-numbered gear stage and the input shaft used for the R-stage implementation are referred to as even shafts .

In the past, when the driver selects the shift lever to be the R range for the backward travel, the R-stage gear of the even-numbered shaft is engaged to transmit the backward power, and at the same time, May be released so as to prevent gear noise that may be generated by the gear stage engaged with the hole shrinkage during the R-stage running.

Further, at the time of the forward speed change stage, the R-stage gear is disengaged for the same reason so that the noise generated by the gears for R-stage formation during forward running can be prevented.

However, in the case of using the transmission control strategy as described above, when the driver shifts the shift lever from the D range to the R range while operating the vehicle at a low speed or vice versa, that is, in the low speed RD and DR Lurch driving situations Since one of the first gear and the R gear is released and the other is engaged, there is a high possibility of a shift response delay, and since the noise is relatively reduced due to the low-speed driving situation, the noise due to the engagement and disengagement of the gear There is a concern that it will become an issue of excessive noise.

It is to be understood that the foregoing description of the inventive concept is merely for the purpose of promoting an understanding of the background of the present invention and should not be construed as an admission that it is a prior art already known to those skilled in the art. Will be.

KR1020130077148A

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to reduce the number of engagement and disengagement of gears as much as possible in a low speed RD, And more particularly, to a control method for a DCT hybrid vehicle that can reduce the occurrence of a vehicle and reduce the occurrence of a vehicle, thereby ultimately improving the commerciality of the vehicle.

According to an aspect of the present invention, there is provided a control method for a DCT hybrid vehicle,

 A state determining step of determining, by the controller, whether the vehicle can be driven by only the motor;

When the R range is selected, when the vehicle can be driven only by the motor, the controller sets all the speed change gears of the even-numbered axles to the released state and the one-stage speed change gear of the hole shrinks to the engaged state Wow;

And the controller includes a motor reversing step of driving the motor in a direction opposite to that in the first-stage running to implement the backward running after the first-step securing step.

When the controller determines that the vehicle can not be driven by only the motor as a result of performing the state grasping step, the R-stage fastening step of fastening the R-stage speed change gear of the even- And the like.

The present invention may further comprise an engine driving step of causing the controller to drive the even-numbered shaft by the power of the engine to implement the reverse running after the R-stage fastening step.

In the first step, the controller operates the even shafting shafting actuator that operates the gears of the even-numbered shafts to release all the gears of the even-numbered shafts to the neutral state, The shafting shifting actuator can be operated to engage the 1-speed gear.

In the case where the controller is already performing the one-step securing step, when the one-stage speed change short-term gear is already engaged in the shift range before the R range selection, the one-stage speed change gear engaged state can be maintained as it is.

Further, in the control method of the DCT hybrid vehicle of the present invention,

A state determining step of determining, by the controller, whether the vehicle can be driven by only the motor;

If the vehicle can be driven only by the motor as a result of the state grasping step, the controller includes a shift stage maintaining step of continuously maintaining the state where the one-stage shift stage short gear of the hole shrinkage is engaged even when the shift ranges are switched .

When the controller determines that the vehicle can not be driven by only the motor as a result of performing the state grasping step, the R-stage fastening step of fastening the R-stage speed change gear of the even- And the like.

The present invention may further comprise an engine driving step of causing the controller to drive the even-numbered shaft by the power of the engine to implement the reverse running after the R-stage fastening step.

The present invention can be configured to include a motor reversing step for implementing a reverse travel by driving the motor in a direction opposite to that in the first-stage traveling, when a backward travel is required during the speed-change stage maintenance step.

The present invention can reduce the number of times of engagement and disengagement of gears as much as possible in the low speed RD and DR Lurch driving situations, thereby reducing the possibility of occurrence of delay in traveling responsiveness and reducing the generation of noises and ultimately improving the commerciality of the vehicle .

1 is a conceptual diagram showing a power train of a DCT hybrid vehicle to which the present invention can be applied;
2 is a diagram showing a first embodiment of a control method of a DCT hybrid vehicle according to the present invention,
3 is a view showing a second embodiment of a control method of a DCT hybrid vehicle according to the present invention,
4 is a diagram showing a third embodiment of the control method of the DCT hybrid vehicle according to the present invention.

1 shows a powertrain of a DCT hybrid vehicle to which the present invention can be applied. The engine E is connected to a motor M via an engine clutch EC, the motor is connected to a DCT, A first clutch CL1 is interposed between the motor and the hole shrinkage and a second clutch CL2 is interposed between the motor and the even axis. Shafting shifting actuator (OA) configured to engage and disengage the gear shafts of the shaft shafts, and a shafting shifter (EA) configured to engage and disengage the gearshift gear of the even shaftshaft, And a drive wheel DW is connected to the output shaft through a differential gear (DIFF).

The controller C is configured to control the engine, the engine clutch, the motor, the first clutch, the second clutch, the shifting actuator of the even-axis shaft, and the shifting actuator of the hole shrinkage.

Of course, in the figure, one controller is described as controlling all of the above elements. However, the controller may be divided into a plurality of controllers. For example, an engine controller for controlling the engine, a motor controller A transmission controller for controlling the components of the DCT, a hybrid controller for controlling the engine controller and the transmission controller from a higher level, and the like. However, for a clear understanding of the concept of the present invention, A symbolic controller expresses that all of the above elements are controlled. Therefore, the configuration of the controller is not limited to be interpreted by the drawings.

For the reference, the gear shafts are provided with speed change gears for implementing odd speed change stages among a series of speed change stages to be implemented in the DCT, and the even shafts are provided with speed change stage gears for implementing even- These gear arrangements are the same as those of a general DCT, and therefore, a detailed description thereof will be omitted.

FIG. 2 illustrates a first embodiment of a control method for a DCT hybrid vehicle according to the present invention, and includes a state grasping step (S10) in which the controller determines whether the vehicle can be driven by only a motor; When the R range is selected, when the vehicle can be driven only by the motor, the controller sets all the speed change gears of the even-numbered axles to the released state and the one-stage speed change gear of the hole shrinks to the engaged state (S20); After the step of securing the first step, the controller includes a motor reversing step (S30) for driving the motor in a direction opposite to that of the first step, thereby implementing a reverse travel.

That is, when it is determined that the vehicle can be driven only by the motor, such as when the EV travel is enabled, even if the driver selects the R range as the shift lever, the R- The RD is switched from the D range to the R range by the driver as the shift lever and vice versa, by allowing the motor to run in the direction opposite to the one-stage running after securing the short- It is unnecessary to perform the operation of engaging and disengaging the first-speed-change short-stroke gear and the R-speed short-stroke gear unnecessarily in the DR Lurch driving situation, so that noise due to the engagement and disengagement of the gear is prevented and the shift response is greatly improved .

In the first step, the controller operates the even shafting shafting actuator that operates the gears of the even-numbered shafts to release all the gears of the even-numbered shafts to the neutral state, The shafting shifting actuator can be operated to engage the 1-speed gear.

In the case where the controller performs the step 1 securing step, if the 1-speed shift stage short gear is already engaged in the shift range prior to the R-range selection, the 1-speed gear stage gear engagement state is maintained.

For example, when the shift lever is in the D range before the R range and the one-stage shift short-term is engaged in the D range, the state in which the one-stage speed change short- When the step of securing the step is completed and the driver steps on the accelerator pedal to perform the reverse operation, the motor is reversely rotated to implement the reverse travel.

When the controller determines that the vehicle can not be driven only by the motor as a result of the state grasping step, if the R range is selected, an R-stage fastening step (S40) for fastening the R- And an engine driving step (S50) in which the controller drives the even-numbered shafts by the power of the engine to implement the reverse running after the R-stage fastening step.

That is, if it is determined that the EV travel is impossible, such as a failure of the electric system for driving the motor or the like, the shift lever is selected as the R range by the driver as in the normal reverse implementation of the DCT, And an engine clutch is engaged to engage the reverse speed drive with the power generated from the engine.

FIG. 3 illustrates a second embodiment according to the present invention. The present invention includes a state (S10) in which the controller determines whether the vehicle can be driven by only a motor; If it is determined that the vehicle can be driven only by the motor as a result of the state grasping step, the controller may perform a shift stage maintaining step S20 (step S20) in which the single- ').

That is, in the present embodiment, in a state in which the vehicle can be driven only by the motor, even when the shift range is switched to any one of P, R, N, and D by the shift lever, the state in which the one- .

When the driver releases the brake pedal or depresses the accelerator pedal to request a backward travel during the above-described step of maintaining the speed change stage, the controller drives the motor in the direction opposite to the first- When the D range is selected and the driver releases the brake pedal or depresses the accelerator pedal, the motor is forwardly rotated to start the first-step forward travel.

Therefore, even if the driver frequently switches the DR or RD, it is possible to implement the forward and backward movements extremely easily and quickly without being coupled with the new release of the speed change gear, so that noise caused by gear engagement and disengagement is prevented, .

If the controller determines that the vehicle can not be driven by only the motor as a result of the state grasping step, the R-stage fastening step S40 After the R-stage fastening step, when the driver starts the vehicle, the controller performs an engine driving step (S50) for driving the even-numbered axis by the power of the engine to implement the backward running.

FIG. 4 shows another embodiment of the present invention in which the state of the hybrid vehicle includes an OFF state in which the engine is stopped and all the power sources are cut off, an ACC state in which power is supplied to an accessory electric device such as audio, The HEV READY state is determined (S100) in the vehicle in which the motor is drivable to maintain the running state of the vehicle and the HEV READY state in which the vehicle is actually prepared for starting so as to correspond to the conventional engine start state, If the HEV is not READY, then both the hole shrinkage and the even shafting shafts in the P, R, N, and D ranges are maintained in the neutral state without engaging any shifting shafts (S150). In the HEV READY state, Whether the vehicle can be driven is determined as the EV mode availability (S200).

When the EV mode is enabled, the state where the one-stage shift shortwave is engaged in all the shift ranges is maintained (S250) as in the above-described second embodiment, and the R short-speed drive and the first- , The noise due to the RD operation of the shift lever and the switching of the gear engagement state during the DR operation are prevented, and the quick shift responsiveness can be ensured.

When the EV mode is judged to be impossible, the odd-numbered axle basically engages the one-stage speed change gear at all the shift ranges, and the even-numbered axle locks the R-speed change gear at the P- The engine is driven by the power of the even-numbered axis to implement the reverse.

For reference, the odd-numbered shafts in the R range can be configured to prevent the gear noise caused by the one-stage shift stage gear of the hole shrinkage during the reverse operation from N stages, not the first stage, .

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

S10; State grasp step
S20; Step 1
S20 '; Gearbox maintenance phase
S30; Motor Reverse Phase
S40; R fastening step
S50; Engine-driven phase

Claims (9)

A state determining step of determining, by the controller, whether the vehicle can be driven by only the motor;
When the R range is selected, when the vehicle can be driven only by the motor, the controller sets all the speed change gears of the even-numbered axles to the released state and the one-stage speed change gear of the hole shrinks to the engaged state Wow;
Wherein the controller is configured to drive the motor in a direction opposite to that in the first-stage running, thereby realizing a backward running;
And a control unit for controlling the DCT hybrid vehicle.
The method according to claim 1,
An R-stage fastening step of fastening an R-stage speed change gear of even-numbered shafts when the R-range is selected when the controller determines that the vehicle can not be driven by only the motor as a result of the state grasping step;
And a control unit for controlling the DCT hybrid vehicle.
The method of claim 2,
An engine driving step of causing the controller to drive the even-numbered shaft with the power of the engine to implement the reverse travel after the R-stage fastening step;
And a control unit for controlling the DCT hybrid vehicle.
The method according to claim 1,
In the first step, the controller operates the even shafting shafting actuator that operates the gears of the even-numbered shafts to release all the gears of the even shafts to the neutral state, and the hole The shafting shifting actuator is operated to engage the 1-speed gear
Wherein the DCT hybrid vehicle is a hybrid vehicle.
The method according to claim 1,
In the case where the controller performs the step 1 securing step and the 1-speed shift short period is already engaged in the shift range before the R-range selection, the 1-speed gear stage gear engagement state is maintained
Wherein the DCT hybrid vehicle is a hybrid vehicle.
A state determining step of determining, by the controller, whether the vehicle can be driven by only the motor;
Wherein when the vehicle is driven only by the motor as a result of the state grasping step, the controller continuously maintains the engaged condition of the one-stage shift short period of the hole shrinkage even when the shift ranges are switched;
And a control unit for controlling the DCT hybrid vehicle.
The method of claim 6,
An R-stage fastening step of fastening an R-stage speed change gear of even-numbered shafts when the R-range is selected when the controller determines that the vehicle can not be driven by only the motor as a result of the state grasping step;
And a control unit for controlling the DCT hybrid vehicle.
The method of claim 7,
An engine driving step of causing the controller to drive the even-numbered shaft with the power of the engine to implement the reverse travel after the R-stage fastening step;
And a control unit for controlling the DCT hybrid vehicle.
The method of claim 6,
Wherein the controller is configured to drive the motor in a direction opposite to that in the first-stage running, and to implement a reverse running if the backward running is required during the step of maintaining the speed change stage;
And a control unit for controlling the DCT hybrid vehicle.

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