KR20210060696A - Hybrid vehicle and method of controlling limphome drive for the same - Google Patents

Abstract

The present invention relates to a hybrid vehicle and a limp-home driving control method therefor and, more specifically, to a hybrid vehicle capable of preventing damage to a power train when the hybrid vehicle having a transmission with no reverse (R) stage suffers a failure during reversing, and a limp-home driving control method therefor. In accordance with an embodiment of the present invention, a limp-home driving control method for a hybrid vehicle having a transmission with no reverse stage comprises the steps of: checking, by a transmission controller, the current shift stage and whether an engine is operating if a specific type of failure causing a closed state of an engine clutch disposed between the engine and a driving motor is detected; controlling, by the transmission controller, shifting of the transmission to an N stage when the current shift stage is a reverse stage and the engine is operating; and starting limp-home driving through cooperative control of an engine controller for controlling the engine and the transmission controller when a driving stage is input.

Description

Hybrid vehicle and rim form driving control method for it {HYBRID VEHICLE AND METHOD OF CONTROLLING LIMPHOME DRIVE FOR THE SAME}

The present invention relates to a hybrid vehicle and a rimform driving control method therefor, and in more detail, a hybrid vehicle capable of preventing powertrain burnout in a situation where a failure occurs during reversing in a hybrid vehicle having a transmission in which the reverse (R) stage is omitted. It relates to a vehicle and a method for controlling the driving of the rim form.

As interest in the environment has recently increased, the development of eco-friendly vehicles is also being actively carried out. Representative examples of eco-friendly vehicles include electric vehicles (EVs) and hybrid electric vehicles (HEVs).

A hybrid vehicle (HEV) generally refers to a vehicle that uses two power sources together, and the two power sources are mainly an engine and an electric motor. These hybrid vehicles have been developed in recent years because they have superior fuel economy, superior power performance, and are advantageous in reducing exhaust gas compared to vehicles having only an internal combustion engine.

This hybrid vehicle can operate in two driving modes depending on which power train is driven. One of them is an electric vehicle (EV) mode that runs only with an electric motor, and the other is a hybrid electric vehicle (HEV) mode that generates power by operating an electric motor and an engine together. Hybrid vehicles perform switching between the two modes depending on conditions while driving. The switching between these driving modes is generally performed for the purpose of maximizing fuel economy or driving efficiency according to the efficiency characteristics of the powertrain.

1 shows an example of a power train structure of a general hybrid vehicle.

In FIG. 1, a power train structure of a hybrid vehicle to which a parallel type (or Transmission Mounted Electric Drive (TMED)) method is applied is shown.

Referring to FIG. 1, an electric motor (or a driving motor 140) and an engine clutch (EC) 130 are disposed between an internal combustion engine engine (ICE) 110 and a transmission 150.

In such a vehicle, in general, when the driver steps on the accelerator after starting, the motor 140 is first driven by using the power of the battery while the engine clutch 130 is open, and the power of the motor is the transmission 150 and the longitudinal reducer. (FD: Final Drive, 160) to move the wheel (ie, EV mode). When the vehicle is gradually accelerated and gradually greater driving force is required, the auxiliary motor (or starter generator motor 120) may be operated to drive the engine 110.

Accordingly, when the rotational speeds of the engine 110 and the motor 140 become the same, the engine clutch 130 engages and the engine 110 and the motor 140 operate together, or the engine 110 drives the vehicle (that is, , Transition from EV mode to HEV mode). When a preset engine off condition such as a vehicle deceleration is satisfied, the engine clutch 130 is opened and the engine 110 is stopped (ie, transition from the HEV mode to the EV mode). In addition, in a hybrid vehicle, a battery can be charged by converting the driving force of a wheel into electric energy during braking, which is referred to as braking energy regeneration or regenerative braking.

The starting power generation motor 120 functions as a start motor when the engine is started, and operates as a generator when the rotational energy of the engine is recovered after starting or when the engine is turned off, so "Hybrid Starter Generator (HSG) Generator)", and in some cases, it can also be referred to as "auxiliary motor".

However, unlike the engine 110, since the motor 140 is capable of changing the rotation direction, when reverse is required, the drive shaft can be reversely rotated without a reverse (R) stage in the transmission 150. This will be described with reference to FIG. 2.

FIG. 2 is a diagram for explaining a form in which a hybrid vehicle moves backward when a transmission whose reverse stage is removed is applied. In FIGS. 2A and 2B, it is assumed that the hybrid vehicle moves backward while the engine clutch is open.

First, referring to Figure 2 (a), when the R stage is implemented in the transmission 150, when the motor 140 rotates in the forward direction (that is, the same direction as the rotation direction of the engine), the transmission 150 is R At the stage, the direction of rotation is changed to the reverse direction, so that the output stage of the transmission R rotates in the reverse direction.

In contrast, when the R stage is omitted from the transmission 150' as shown in Fig. 2(b), when the motor 140 rotates in the reverse direction, the transmission 150' is in the first stage state in the reverse direction for both the input stage and the output stage. Will rotate. Therefore, even if the R-stage is deleted from the transmission, it is possible to reverse in a parallel hybrid vehicle, and an effect of improving durability and fuel economy with a simple transmission 150 ′ can be expected.

However, when a failure occurs in the controller or the actuator driving the engine clutch 130 in a reverse (ie, reverse motor rotation) situation of a hybrid vehicle having the transmission 150 ′ in which the R gear is omitted, there is a problem that did not exist in the past. Occurs.

Specifically, in a hybrid vehicle in which the transmission is a dual clutch transmission (DCT) type, the engine 110 is started when a powertrain (especially, the engine clutch) fails, and the dual clutch transmission 150 is in a locked-up state of the engine clutch 130. ) Is controlled in a sleep state to drive the rimhome, which is an emergency driving mode with a fail-safe concept, also called a so-called takeup method. However, when the rim form driving control is applied due to such a failure during reversing, since the rotation direction of the engine 110 and the rotation direction of the motor 140 rotating in reverse are opposite, a problem occurs in the coupling of the engine clutch 130, and severe If so, it can lead to hardware damage.

This problem is particularly noticeable when a dry engine clutch of a normal close type is installed. Normally closed type dry engine clutches generate hydraulic pressure as the oil moves toward the slave cylinder (CSC: Concentric Slave Cylinder) as the hydraulic control actuator (HCA: Hydrostatic Clutch Actuator) operates the internal master cylinder. The engine clutch is opened by pushing the diaphragm spring of the clutch with the hydraulic pressure. As a result, the engine clutch 130 stays in the engaged state in a situation in which the hydraulic pressure caused by the drive of the actuator HCA does not act on the clutch, for example, a controller failure, a start-off state, or an oil leakage situation.

Accordingly, there is a need for a method of preventing hardware damage according to the characteristics of the engine clutch when a failure occurs during reverse in a hybrid vehicle equipped with a transmission in which the R-stage is omitted and more effectively rim form driving.

An object of the present invention is to provide a hybrid vehicle capable of effectively rimform driving and preventing hardware damage according to characteristics of an engine clutch when a failure occurs during reverse in a hybrid vehicle having a transmission in which the reverse stage is omitted, and a control method thereof.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

In order to solve the above technical problem, a method for controlling a rim form driving of a hybrid vehicle having a transmission having a transmission with a reverse end removed according to an embodiment of the present invention includes an engine clutch in which a transmission controller is disposed between an engine and a drive motor. If a specific type of failure causing a closed state is detected, checking whether a current shift stage and the engine are operating; When the current shift stage is a reverse stage and the engine is operating, the transmission controller transitioning the transmission to the N stage; And starting rim form driving through cooperative control between an engine controller controlling the engine and the transmission controller when a driving stage is input.

In addition, a hybrid vehicle according to an embodiment of the present invention includes a transmission in which the reverse stage is deleted; An engine clutch disposed between the engine and the drive motor; And when a specific type of failure that causes the engine clutch to be closed is detected, checks the current shift stage and whether the engine is operating, and when the current shift stage is a reverse stage and the engine is operating, the transmission is N-speed. And a transmission controller that starts driving the rim form through cooperative control with an engine controller that controls the engine when a transition control is performed and a driving stage is input.

In a hybrid vehicle having a transmission in which the reverse stage is omitted according to at least one embodiment of the present invention configured as described above, when a failure occurs while reversing, rimform driving is started after securing the driving stage based on the status of the shift stage and whether the engine is started. By controlling it, it is possible to drive the rim form while preventing hardware damage.

The effects that can be obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

1 shows an example of a power train structure of a hybrid vehicle to which embodiments of the present invention can be applied.
FIG. 2 is a diagram for explaining a form in which a hybrid vehicle moves backward when a transmission whose reverse stage is removed is applied.
3 is a block diagram showing an example of a control system of a hybrid vehicle to which embodiments of the present invention can be applied.
4 is a flowchart illustrating an example of a process of performing rimform driving in a hybrid vehicle according to an embodiment of the present invention.
5 shows an example of a form of outputting that rimform driving control is performed according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, parts denoted by the same reference numerals throughout the specification refer to the same components.

Prior to describing the rimform driving control method according to embodiments of the present invention, a mutual relationship between controllers of a hybrid vehicle applicable to the embodiments will be described with reference to FIG. 3.

3 is a block diagram showing an example of a control system of a hybrid vehicle to which embodiments of the present invention can be applied.

3, in a hybrid vehicle to which embodiments of the present invention can be applied, the internal combustion engine 110 is controlled by the engine controller 210, and the starter generation motor 120 and the electric motor 140 are motor controllers (MCUs). : The torque may be controlled by the Motor Control Unit 220, and the engine clutch 130 may be controlled by the clutch controller 230, respectively. Here, the engine controller 210 may be an engine control system (EMS). In addition, the transmission 150 ′ is controlled by the transmission controller 250. In some cases, a controller of the starter generation motor 120 and a controller for each of the electric motor 140 may be separately provided. In addition, the clutch controller 230 may include an HCA in the case of the normally closed type dry engine clutch 130.

Each controller is connected to a hybrid controller (HCU: Hybrid Controller Unit) 240 that controls the overall mode switching process as its host controller, and is necessary for changing the driving mode according to the control of the hybrid controller 240 and controlling the engine clutch during gear shifting. Information and/or information necessary for engine stop control may be provided to the 240 or may perform an operation according to a control signal.

More specifically, the hybrid controller 240 determines whether to perform mode switching according to the driving state of the vehicle. For example, the hybrid controller may determine a state of the engine clutch 130 (Lock-up, Slip, Open, etc.), a release time, and the like, and control a fuel injection stop time of the engine 110. In addition, the hybrid controller may control the recovery of engine rotation energy by transmitting a torque command for controlling the torque of the starting power generation motor 120 to the motor controller 220 for engine stop control. In addition, the hybrid controller 240 may control a lower controller for determining and switching a mode switching condition during driving mode switching control.

Of course, it is obvious to those skilled in the art that the above-described connection relationship between the control periods and the function/classification of each controller are exemplary and are not limited to their names. For example, the hybrid controller 240 may be implemented so that a corresponding function is replaced and provided in any one of the other controllers except for it, or a corresponding function may be distributed and provided in two or more of the other controllers.

The embodiments described below will be described on the assumption that they are applied to a hybrid vehicle according to the powertrain configuration shown in FIG. 2 and the controller system diagram shown in FIG. 3. However, this is for convenience of description, and it is apparent to those skilled in the art that the vehicle structure according to the embodiment may be changed within a range that does not conflict with the embodiment.

As described above, in a hybrid vehicle having a dry engine clutch 130 of a normal close type and a dual clutch transmission 150 ′ in which the reverse (R) stage is deleted, the R stage is deleted in the hybrid vehicle of this configuration. In the event of a major failure, keep the engine clutch open, and when you want to move forward again, you can secure the engine start and perform rim form driving. However, when a specific type of failure such as a CAN communication error of the hybrid controller 240 or an HCA leakage failure of the engine clutch 130 occurs, the engine clutch 130 is maintained in a closed state. It is not possible to prevent secondary failure due to the bonding of the rotating shaft.

In more detail, in the case of a CAN failure of the HCU 240, since there is a case in which communication with the clutch controller 230, that is, the HCA, is impossible, the clutch controller 230 fails if it does not receive the control command from the HCU 240. The engine clutch 130 is controlled in a locked-up state according to a fail-safe logic. Accordingly, a problem may occur as the engine clutch 130 is fastened. In the case of an oil leakage failure, the hydraulic pressure is lost and the engine clutch transitions to a locked state, so hardware damage may occur when attempting to drive the rim form in a reverse situation.

Accordingly, according to an embodiment of the present invention, when a specific type of failure is detected in a hybrid vehicle with a transmission without a reverse stage, a driving stage is secured according to the operation of the engine and the rim form driving control is initiated. It is suggested to prevent damage to the train.

For example, when a CAN time-out failure occurs in which a CAN frame is not received in the HCU 240 for a predetermined time during reversing, the transmission controller 250 may recognize the CAN failure of the HCU 240. Accordingly, the transmission controller 250 checks the current shift stage, and checks whether the engine 110 is operating from the EMS 210. At this time, if the current shift stage is the R stage and the engine is in operation, the transmission controller 250 immediately controls the transmission 150 ′ to the N stage. This is to prevent burnout of the engine clutch 130 and reverse driving of the engine because the clutch controller 230 automatically locks up the engine clutch 130 by a failure reaction when the clutch controller 230 does not receive a command from the HCU 240. Here, when the shift stage is the R stage, the R stage of the DCT 150 has been deleted. This does not mean that the physical gear state of the DCT 150 itself is the R stage, but the motor 140 is controlled to rotate in reverse. Means.

If the engine is not in operation, the transmission controller 250 requests the EMS 210 to prohibit engine starting, and waits until the driver changes the gear stage to D. Thereafter, when the D-stage is reached, the transmission controller 250 transmits a rim form mode signal. Receiving the rim form mode signal, the motor controller 220 secures the engine start through the HSG 120 (if it is already starting, the start through HSG is omitted), and when the start is secured, the transmission between the transmission controller 250 and the EMS 210 Rimform (ie, DCT Takeup) control may be initiated through control.

As another example, when an engine clutch leak is diagnosed (ie, HCA failure information is received) during reversing, the transmission controller 250 checks the current shift stage and checks whether the engine 110 is operating from the EMS 210. At this time, if the current shift stage is the R stage and the engine is in operation, the transmission controller 250 immediately controls the transmission 150 ′ to the N stage. If the engine is not in operation, the transmission controller 250 requests the EMS 210 to prohibit engine starting, and waits until the driver changes the gear stage to D. After that, when the D-stage is reached, the transmission controller 250 transmits a rim form mode signal. Receiving the rim form mode signal, the motor controller 220 secures the engine start through the HSG 120 (if it is already starting, the start through HSG is omitted), and when the start is secured, the transmission between the transmission controller 250 and the EMS 210 Rimform (ie, DCT Takeup) control may be initiated through control.

The control process described so far is summarized in a flow chart as shown in FIG. 4.

4 is a flowchart illustrating an example of a process of performing rimform driving in a hybrid vehicle according to an embodiment of the present invention. In FIG. 4, a hybrid vehicle including a normally closed type dry engine clutch 130 and a dual clutch transmission 150 ′ from which the reverse (R) stage is removed is assumed.

Referring to FIG. 4, first, the transmission controller 250 may detect whether a specific type of failure that causes the closed state of the engine clutch such as a CAN failure of the HCU 240 or an HCA failure of the clutch controller 230 has occurred ( S401).

When the occurrence of the failure is detected (Yes in S401), the transmission controller 250 checks the current shift stage (S402), and if it is not in the R stage (No in S402), it waits for the D-speed shift (S405), and D However, upon input, the rim form driving signal is transmitted (S406).

In addition, the transmission controller 250 checks the engine operation state (S407), and immediately starts the rim form driving control through cooperative control with the EMS 210 when the engine is in operation (S412). In contrast, when the engine is in the off state (No in S407), the transmission controller 250 performs the N-stage transition control (S408), and the motor controller 220 operates the HSG 120 as the rim form driving signal is received. Using the engine 110 can be started (S409). When the engine start is secured, rimform driving control may be started (S412).

On the other hand, when the transmission controller 250 confirms that the current shift stage is the R stage (Yes in S402), it checks whether the engine is operating (S403). When the engine is not in operation (No in S403), the transmission controller 250 may request the EMS 210 to prohibit engine start (S404) and wait for a D-stage input (S405). Since the control after step S405 is the same as described above, duplicate descriptions will be omitted.

On the contrary, when the shift stage is the R stage and the engine is in operation (Yes in S403), the transmission controller 250 controls the transmission 150 to the N stage (S410) and waits for a D-stage input (S411). When the D stage is input, the transmission controller 250 may start driving the rim form through cooperative control with the EMS 210 (S412).

Meanwhile, whether or not the above-described rimform driving control is performed may be output in a form that the driver can recognize. Specifically, the hybrid vehicle according to the embodiment may include a display device such as a cluster, a display of a head unit or an audio/video/navigation (AVN) system, and a head-up display (HUD). When a signal for driving a rim form according to cooperative control is received from a transmission controller or an engine controller in such a display device, corresponding information may be displayed through the display device. This will be described with reference to FIG. 5.

5 shows an example of a form of outputting that rimform driving control is performed according to an embodiment of the present invention.

Referring to FIG. 5, in the hybrid vehicle according to the embodiment, it may be output in the form of text that rimform driving control for preventing hardware damage is performed in a region 510 that allows arbitrary text display in the cluster 500.

Of course, such a display form is exemplary, and the text may be replaced with a warning light flashing at a fixed position or may be displayed in the form of an icon.

In addition, it goes without saying that not only the display type but also the displayed position can be changed to another position in the cluster, the display of the AVN system or the head unit, the head-up display, and the like.

The present invention described above can be implemented as a computer-readable code on a medium on which a program is recorded. The computer-readable medium includes all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include hard disk drives (HDDs), solid state disks (SSDs), silicon disk drives (SDDs), ROMs, RAM, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, etc. There is this.

Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (19)

In the rimform driving control method of a hybrid vehicle having a transmission with a reverse stage eliminated,
Checking, by the transmission controller, a current shift stage and whether or not the engine is operating when a specific type of failure causing a closed state of the engine clutch disposed between the engine and the driving motor is detected;
When the current shift stage is a reverse stage and the engine is operating, the transmission controller transitioning the transmission to the N stage; And
And starting rimform driving through cooperative control between an engine controller controlling the engine and the transmission controller when a driving stage is input. The method of claim 1,
When the current shift stage is the reverse stage and the engine is not in operation, the transmission controller further comprises the step of requesting the engine controller to prohibit engine start. The method of claim 2,
Waiting for an input of the driving stage when the current shift stage is not the reverse stage or when the engine start prohibition is requested; And
When the driving stage is input during the standby, the transmission controller further comprises transmitting a rim form driving signal. The method of claim 3,
When receiving the rim form driving signal from a motor controller, further comprising the step of starting the engine through a starting power generation motor, rim form driving control method of a hybrid vehicle. The method of claim 4,
Prior to the starting step, the transmission controller further comprises the step of controlling the transmission to the N-stage transition, the rim form driving control method of a hybrid vehicle. The method of claim 1,
The engine clutch includes a normally closed type dry engine clutch. The method of claim 6,
The above specific types of failures are:
A method for controlling rimform travel of a hybrid vehicle, comprising a communication failure failure of a hybrid controller and a failure of an actuator of the engine clutch. The method of claim 1,
The method further comprising the step of outputting information indicating that the rim form driving is started through a display means. The method of claim 1,
The transmission includes a dual clutch transmission (DCT),
The rim form driving includes DCT take-up control, a rim form driving control method of a hybrid vehicle. A computer-readable recording medium in which a program for executing the method for controlling rimform travel of a hybrid vehicle according to any one of claims 1 to 9 is recorded. Transmission with the reverse stage removed;
An engine clutch disposed between the engine and the drive motor; And
When a specific type of failure causing the engine clutch to be closed is detected, the current shift stage and whether the engine is operating are checked, and when the current shift stage is the reverse stage and the engine is in operation, the transmission is moved to the N stage. A hybrid vehicle comprising a transmission controller for starting rimform driving through a transition control and cooperative control with an engine controller for controlling the engine when a driving stage is input. The method of claim 11,
The transmission controller,
When the current shift stage is the reverse stage and the engine is not in operation, requesting the engine controller to prohibit engine start. The method of claim 12,
The transmission controller,
When the current shift stage is not the reverse stage or when the engine start prohibition is requested, waiting for the input of the driving stage, and transmitting a rimform driving signal when the driving stage is input during the standby. The method of claim 13,
When receiving the rim form driving signal, the hybrid vehicle further comprising a motor controller for controlling a starting power generation motor to start the engine. The method of claim 14,
The transmission controller,
A hybrid vehicle for controlling the transmission to the N-stage before starting the engine. The method of claim 11,
The engine clutch comprises a dry engine clutch of a normally closed type, a hybrid vehicle. The method of claim 16,
The above specific types of failures are:
A hybrid vehicle comprising a communication failure failure of a hybrid controller and an actuator failure of the engine clutch. The method of claim 11,
The hybrid vehicle further comprising a display means for outputting information indicating that the rimform driving is started. The method of claim 11,
The transmission includes a dual clutch transmission (DCT),
The rim form driving comprises a DCT take-up control, a hybrid vehicle.

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