KR101766078B1

KR101766078B1 - Apparatus for protecting engine clutch of hev and method thereof

Info

Publication number: KR101766078B1
Application number: KR1020150174358A
Authority: KR
Inventors: 서정우; 최정완; 김요한
Original assignee: 현대자동차주식회사
Priority date: 2015-12-08
Filing date: 2015-12-08
Publication date: 2017-08-07
Also published as: KR20170067563A

Abstract

[0001] The present invention relates to an apparatus and method for protecting an engine clutch of a hybrid vehicle. When a TMED type parallel hybrid vehicle travels at a low speed in a steep sloped back road in a state where the hybrid vehicle is not in a first stage, It is possible to protect the engine clutch from the high temperature generated in the slip control process of the engine clutch and to enable the hybrid vehicle to travel even in a situation where the SOC of the high voltage battery is insufficient, I want to provide that method.
To this end, the present invention provides an engine clutch protecting apparatus for a hybrid vehicle, wherein a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine, comprising: a gear range detecting unit for detecting a speed range at the time of traveling of the hybrid vehicle; A temperature detector for detecting the temperature of the engine clutch; A shifting portion that performs shifting of the speed change stage; And a control unit for controlling the transmission so as to perform a downshift when the speed change stage detected by the speed change stage detection unit is not one stage and the temperature of the engine clutch detected by the temperature detection unit exceeds a threshold value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an engine clutch protecting apparatus for a hybrid vehicle,

[0001] The present invention relates to an engine clutch protecting apparatus and method for a hybrid vehicle, and more particularly, to an engine clutch protecting apparatus and method for a hybrid vehicle, which comprises a hybrid hybrid vehicle of TMED (Transmission Mounted Electric Device) type in which a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine The present invention relates to a technique for protecting an engine clutch from a high temperature generated by a slip control of an engine clutch when a hybrid electric vehicle (HEV) is driven at a low speed on a steep sloping road.

Generally, the parallel type TMED HEV continuously performs the slip control of the engine clutch to prevent the engine stall when the steep slope runway runs at a low speed.

Although the slip control of the engine clutch is mainly used in the first-stage running, even when the vehicle is directly connected to the low-speed running in the manual mode or during the 2/3-speed running, the slip control of the engine clutch is maintained . At this time, since a larger transmission torque is required as the gear is moved to a higher gear, the slip amount of the engine clutch at the 2/3 stage with respect to the first gear becomes larger, and the temperature of the engine clutch rapidly increases.

When the temperature model of the engine clutch reaches a certain temperature, the over-temperature protection logic is operated to prevent deterioration of the engine clutch.

The over-temperature protection logic of the conventional engine clutch is used to determine the slip time of the engine clutch and to make positive measures such as adjustment of the applied oil pressure or restriction of the engine RPM, or to open the engine clutch completely to induce EV drive Take it.

The conventional overcurrent protection logic of the engine clutch has no problem if the SOC (State Of Charge) of the high voltage battery is sufficient when a situation occurs in which the engine clutch is fully opened due to a very high temperature of the engine clutch. However, There is a problem in that the vehicle can not be driven when the engine clutch is opened.

Korean Patent Publication No. 10-0858183

In order to solve the problems of the conventional art as described above, the present invention provides a TMED-type parallel hybrid vehicle in which when the temperature of the engine clutch exceeds a threshold value, The engine clutch can be protected from the high temperature generated during the slip control process of the engine clutch and the hybrid vehicle can be driven even when the SOC of the high voltage battery is insufficient. The purpose is to provide.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, an apparatus for protecting an engine clutch of a hybrid vehicle, in which a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine, includes: ; A temperature detector for detecting the temperature of the engine clutch; A shifting portion that performs shifting of the speed change stage; And a control unit for controlling the transmission so as to perform a downshift when the speed change stage detected by the speed change stage detection unit is not one stage and the temperature of the engine clutch detected by the temperature detection unit exceeds a threshold value.

A method of protecting an engine clutch of a hybrid vehicle in which a motor is mounted on a transmission side and an engine clutch is provided between a motor and an engine, the method comprising the steps of: detecting a speed change stage at the time of traveling of the hybrid vehicle; ; Detecting a temperature of the engine clutch; Controlling the transmission to perform the downshift if the detected speed range is not the first speed and the temperature of the detected engine clutch exceeds the threshold value; And the shifting portion performs the downshifting.

When the temperature of the engine clutch exceeds the threshold value at the time of running the steep sloping back road at a low speed in a state where the TMED type parallel hybrid vehicle is not in the first stage, the downshift shift of the engine clutch is performed, There is an effect that the engine clutch can be protected from the high temperature generated in the process.

In addition, when the TMED-type parallel hybrid vehicle is running at a low speed in a state where the hybrid type hybrid vehicle is not in the first stage and when the temperature of the engine clutch exceeds a threshold value, the downshift is performed. So that the hybrid vehicle can be driven.

Fig. 1 is an example of a TMED type parallel hybrid vehicle to which the present invention is applied,
2 is a block diagram of an engine clutch protecting apparatus for a hybrid vehicle according to an embodiment of the present invention.
3 is a flowchart of an embodiment of a method for protecting an engine clutch of a hybrid vehicle according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an example of a TMED type parallel hybrid vehicle to which the present invention is applied.

1, the TMED type parallel hybrid vehicle to which the present invention is applied includes an operation request detecting section 10, an ECU 20, a TCU 30, a battery 40, a BMS 50, an HCU / MCU 60, an inverter 70, an engine 80, an engine clutch 90, a motor 100, a transmission 110, and a drive wheel 120.

First, the operation request detector 10 detects a driver's request signal including a displacement of an accelerator position sensor (APS), a displacement of a throttle valve, and a brake pedal, which are driving requests of the driver, Output information.

The ECU 20 controls the overall operation of the engine 80 in accordance with the request of the HCU / MCU 60 which is the host controller.

The TCU 30 determines a target shift stage for up / down according to the current vehicle speed and the displacement of the throttle valve to control the speed ratio of the transmission 110. When the target shift stage is determined, ) To request the slip control of the engine clutch (90).

The battery 40 supplies the operating voltage to the motor 100 in the hybrid mode and the motor mode and is charged by the regenerative energy recovered through the motor 100 in the regenerative braking mode by the brake braking.

The BMS 50 detects information on the voltage, current, and temperature of the battery 40, and manages the SOC (State Of Charge) state and charge / discharge current amount.

The HCU / MCU 60 controls the overall behavior of the vehicle by controlling the output torque of the engine 80 and the motor 100 by integrally controlling each controller according to the driver's driving request and the vehicle status information.

The HCU / MCU 60 determines the hydraulic pressure for the target slip control when the slip control of the engine clutch 90 is requested from the TCU 30 and controls the hydraulic pressure control for controlling the engine clutch 90 with the current corresponding to the corresponding hydraulic pressure And performs the slip control of the engine clutch 90 by operating the solenoid.

The inverter 70 is an IGBT (Insulated Gate Bipolar Transistor) switch element. The inverter 70 converts a DC voltage of the battery 40 into a three-phase AC voltage according to a PWM (Pulse Width Modulation) control signal applied from the HCU / Thereby driving the motor 100.

The output of the engine 80 is controlled under the control of the ECU 20 under the control of the HCU / MCU 60 which is the host controller, and the intake air amount is adjusted through an ETC (Electric Throttle Control) not shown.

The engine clutch 90 is disposed between the engine 80 and the motor 100 to add the output torque of the engine 80 and the output torque of the motor 100 in the hybrid mode to the transmission 110. [

The motor 100 is driven by the voltage of the battery 40 applied through the inverter 70.

The transmission 110 adjusts the transmission ratio under the control of the TCU 30 and distributes the summed and applied torque through the engine clutch 90 to a synchronous transmission speed ratio and transmits the torque to the drive wheels 120, .

2 is a block diagram of an engine clutch protecting apparatus for a hybrid vehicle according to an embodiment of the present invention.

2, an engine clutch protecting apparatus for a hybrid vehicle according to the present invention includes a speed change detecting unit 210, a temperature detecting unit 220, a control unit 230, and a speed change unit 240.

First, the speed change stage detecting unit 210 detects the speed change stage of the hybrid vehicle being driven.

Next, the temperature detecting section 220 detects the temperature of the engine clutch 90. [

Next, the control unit 230 determines whether the speed change stage detected by the speed change stage detection unit 210 at the time of traveling of the hybrid vehicle is not the first stage and the temperature of the engine clutch 90 detected by the temperature detection unit 220 exceeds the threshold value , And controls the transmission portion 240 to perform the downshift. At this time, the downshift shift is performed after fully opening the engine clutch 90 when the downshift is shifted, and the engine clutch is locked up when the downshift is completed.

Next, the transmission portion 240 is a module for performing the downshift under the control of the controller 230, which means the TCU 30.

In the present invention, driving means advancing.

Although the present invention has been described by way of example in which the transmission speed detector 10, the temperature detector 20 and the controller 30 are implemented as components for protecting the engine clutch of the hybrid vehicle, The temperature detection unit 20, and the control unit 30 may be performed by the HCU / MCU 60.

Further, the downshift in the present invention means lowering one stage in the current gear stage. For example, when the current speed change stage is three-stage, the shift is shifted to the second stage, and when the current shift stage is the second-stage, the shift is performed to the first stage.

FIG. 3 is a flowchart of an embodiment of a method for protecting an engine clutch of a hybrid vehicle according to the present invention, wherein an engine clutch protecting process of a hybrid vehicle in which a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine is shown.

First, the speed change stage detecting section 210 detects the speed change stage at the time of running of the hybrid vehicle (301).

Thereafter, the temperature detecting unit 220 detects the temperature of the engine clutch (302).

Thereafter, when the control unit 230 determines that the speed change stage detected by the speed change stage detection unit 210 is not the first stage and the temperature of the engine clutch detected by the temperature detection unit 220 exceeds the threshold value, And controls the transmission portion 240 (303).

Thereafter, the transmission portion 240 performs the downshift (304).

Through this process, the engine clutch can be protected from the high temperature generated in the slip control process of the engine clutch, and the hybrid vehicle can be driven even when the SOC of the high voltage battery is insufficient.

Meanwhile, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily deduced by a computer programmer in the field. In addition, the created program is stored in a computer-readable recording medium (information storage medium), and is read and executed by a computer to implement the method of the present invention. And the recording medium includes all types of recording media readable by a computer.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

210:
220: temperature detector
230:
240:

Claims

1. An engine clutch protecting apparatus for a hybrid vehicle in which a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine,
A speed change stage detecting section for detecting a speed change stage at the time of traveling of the hybrid vehicle;
A temperature detector for detecting the temperature of the engine clutch;
A shifting portion that performs shifting of the speed change stage; And
And a control section for controlling the transmission so as to perform a downshift when the speed change stage detected by the speed change stage detection section is not the first stage and the temperature of the engine clutch detected by the temperature detection section exceeds a threshold value,
Wherein,
Wherein the control unit controls the transmission so as to perform the downshift after fully opening the engine clutch and locks up the engine clutch when the downshift is completed.

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The method according to claim 1,
Wherein the transmission portion includes:
And wherein one end of the current clutch is downshifted from the current speed change stage.

1. A method for protecting an engine clutch of a hybrid vehicle in which a motor is mounted on a transmission side and an engine clutch is provided between the motor and the engine,
Detecting a speed change stage at the time of traveling of the hybrid vehicle;
Detecting a temperature of the engine clutch;
Controlling the transmission to perform the downshift if the detected speed range is not the first speed and the temperature of the detected engine clutch exceeds the threshold value; And
The shifting portion performing a downshifting,
Wherein the control step comprises:
A step of fully opening the engine clutch, a step of controlling the transmission to perform a downshift, and a step of locking-up the engine clutch when the downshift is completed. .

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5. The method of claim 4,
The downshift process includes:
Shifting one stage from the current speed change stage.