KR20210046985A - Shift controlling apparatus for hybrid vehicle and method thereof - Google Patents

Abstract

The present invention is to provide a shift control apparatus and method for a hybrid vehicle, which enables control of a lift foot up (LFU) shift using a P2 transmission mounted electric device (TMED) type hybrid vehicle motor. The present invention relates to a shift control apparatus for a hybrid vehicle, which comprises: a sensing unit for sensing vehicle information of a P2 TMED type hybrid vehicle; and a control unit which controls the inclination of a turbine speed of the transmission using a motor when LFU shifting, calculates a slip amount between a target gear stage and turbine speed for shifting, and completes the shifting when a specified minimum slip amount satisfies a specified holding time.

Description

A shift control device and method of a hybrid vehicle {SHIFT CONTROLLING APPARATUS FOR HYBRID VEHICLE AND METHOD THEREOF}

The present invention relates to a shift control device and method of a hybrid vehicle, and more particularly, to control the shift of the LFU (Lift Foot Up) by using a motor of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle, a hybrid It relates to a vehicle shift control apparatus and method.

Recently, the demand for eco-friendly vehicles is increasing due to the continuous demand for fuel efficiency improvement for vehicles and the strengthening of exhaust gas regulations in each country, and a hybrid electric vehicle (HEV) is provided as a realistic alternative to this.

Such hybrid vehicles are a class of electric vehicles including electric vehicles (EV) and fuel cell electric vehicles (FCEV) powered by electric motors, and are two or more power sources of driving motors and engines. It is distinguished from other electric vehicles in that it is powered by a power supply.

The hybrid vehicle according to the present embodiment refers to a vehicle composed of two or more power sources of a driving motor and an engine, and encompasses a plug in hybrid electric vehicle (PHEV) in a broad sense.

The hybrid vehicle is a vehicle using two or more power sources, and may be combined in various ways.

At this time, as the power source, a gasoline engine or diesel engine using conventional fossil fuels and a driving motor driven by electric energy are mixed and used, and the hybrid vehicle depends on how the engine and the driving motor are harmoniously operated depending on the driving situation. Optimal output torque can be provided.

For example, the hybrid vehicle may employ a transmission mounted electric device (TMED) equipped with an automatic transmission (AT) or dual clutch transmission (DCT), and a flywheel mounted electric device (FMED) method.

When a shift occurs while driving in such a hybrid vehicle, the HCU (Hybrid Control Unit) controls torque during shifting using the vehicle's speed, and the TCU (Transmission Control Unit) controls the torque applied to the transmission during shifting, the shift start RPM, and According to the engagement state of the engine clutch, the hydraulic component release control of the current gear stage and the hydraulic component engagement control of the target gear stage are controlled using the hydraulic pressure of each clutch and brake element in the transmission.

Accordingly, various shift control methods suitable for hybrid vehicles have been recently developed, but there is no development that can improve the shift feeling in a lift foot up (LFU) of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle.

The background technology of the present invention is disclosed in Korean Patent Application Laid-Open No. 10-2018-0068153 (published on 21 June 2018, a shift control apparatus and method for a hybrid vehicle).

According to an aspect of the present invention, the present invention was created to solve the above problems, and the LFU (Lift Foot Up) shift can be controlled using a motor of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle. It is an object of the present invention to provide an apparatus and method for controlling a shift in a hybrid vehicle.

A shift control apparatus for a hybrid vehicle according to an aspect of the present invention includes: a sensing unit for sensing vehicle information of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle; And when shifting the lift foot up (LFU), a motor is used to control the slope of the turbine speed of the transmission, calculates the amount of slip between the target gear stage and the turbine speed for shifting, and a specified minimum slip. And a control unit that completes the shift when the amount satisfies the designated holding time.

In the present invention, the control unit checks a lift foot up (LFU) shift based on the position value of the accelerator pedal, and if the lift foot up shifts, enters a SS (shift start) phase, and the sensing unit It characterized in that it detects a plurality of vehicle information designated through.

In the present invention, after entering the SS (shift start) step, when a predetermined first time elapses, the controller enters the SB (shift begin) phase, and the SB (shift begin) step ( phase) to SF (shift finish) phase, but collects vehicle information for shifting from the SS (shift start) phase to the SB (shift begin) phase. It is a section, and is a section in which actual shifting takes place from the SB (shift begin) phase to the SF (shift finish) phase, and the total shift time from the SS phase to the SF phase is specified in advance. .

In the present invention, the control unit performs control of the slope of the turbine speed of the transmission according to a predetermined pattern in order to perform the shift stably, but the control of the slope of the turbine speed is , The control unit controls the motor to perform a slope control of the turbine speed so as to follow a rate of change of a target turbine speed through feedback control.

In the present invention, when the control unit enters the SB stage, after decelerating at a rate of change of the turbine speed according to the first slope, the turbine speed according to the second slope is reduced until a designated second time. It is to control the slope of the turbine speed according to a pattern of decelerating at a rate of change and then decelerating at a rate of change of the turbine speed according to the third slope after the designated second time, and the second time 1 slope is a vertical slope, the second slope is a horizontal slope, and the third slope is a diagonal descending slope, and the magnitude of each slope is: 1st slope> 3rd slope> 2nd slope It is characterized by being.

In the present invention, the control unit calculates a slip amount between a target gear stage and a current turbine speed while performing slope control of the turbine speed, and the calculated slip amount is a specified minimum slip amount. When the minimum slip amount is maintained for a predetermined time, the shifting is completed.

A shift control method of a hybrid vehicle according to another aspect of the present invention includes the steps of: checking whether a control unit of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle shifts a lift foot up (LFU) based on a position value of an accelerator pedal; In case of a lift put-up (LFU) shift, the control unit enters a shift start (SS) phase and detects information on a plurality of designated vehicles; And after entering the SS (shift start) phase, when a predetermined first time elapses, entering a shift begin (SB) phase, and a shift finish (SF) in the SB (shift begin) phase. It characterized in that it includes; performing a shift in the section up to the phase (phase).

In the present invention, from the SS (shift start) phase to the SB (shift begin) phase is a section for collecting vehicle information for shifting, and in the SB (shift begin) phase, SF ( Shift finish) is a section in which the actual shift takes place until the phase, and the total shift time from the SS phase to the SF phase is specified in advance.

In the present invention, in order to perform the shift in the section from the SB (shift begin) phase to the SF (shift finish) phase, the control unit, according to a predetermined pattern, the turbine speed of the transmission (Turbine speed), but in the control of the slope of the turbine speed, the control unit controls the motor to follow the rate of change of the target turbine speed through feedback control. It is characterized in that it means to perform slope control of the turbine speed so as to be performed.

In the present invention, in order to perform the shift in the section from the SB (shift begin) phase to the SF (shift finish) phase, the control unit, when entering the SB phase, according to the first slope After decelerating at the rate of change of the turbine speed, the speed is reduced at the rate of change of the turbine speed according to the second slope until a designated second time, and then the turbine according to the third slope after the designated second time. Control of the slope of the turbine speed according to a pattern that decelerates at a rate of change of the speed, the first slope is a vertical slope, and the second slope is a horizontal slope. , The third slope is a diagonal descending slope, and the magnitude of each slope is a first slope> a third slope> a second slope.

In the present invention, in order to perform a shift in a section from the SB (shift begin) phase to the SF (shift finish) phase, the control unit controls the slope of the turbine speed. Calculating a slip amount between a target gear stage and a current turbine speed during execution; And completing the shift when the calculated slip amount becomes a designated minimum slip amount and the minimum slip amount is maintained for a predetermined time.

According to an aspect of the present invention, the present invention enables to control LFU (Lift Foot Up) shifting by using a motor of a P2 Transmission Mounted Electric Device (TMED) type hybrid vehicle.

1 is an exemplary view schematically showing the configuration of a P2 TMED type hybrid vehicle to which a shift control device according to an embodiment of the present invention is applied.
2 is an exemplary view schematically showing a shift control apparatus of a hybrid vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating a shift control method of a hybrid vehicle according to an embodiment of the present invention.
4 is an exemplary view shown in FIG. 3 to explain turbine speed and acceleration for each shift phase.

Hereinafter, an embodiment of a shift control apparatus and method for a hybrid vehicle according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is an exemplary view schematically showing the configuration of a P2 TMED type hybrid vehicle to which a shift control device according to an embodiment of the present invention is applied.

Referring to FIG. 1, in a P2 TMED type hybrid vehicle to which a shift control device is applied to the present invention, a clutch is mounted between a motor and an engine, and an EV mode driving only with a motor is possible through clutch control. The TMED capable of driving the EV mode is also referred to as "hard type hybrid", and includes a hybrid starter generator (HSG) that starts the engine. This TMED hybrid vehicle runs in the EV mode in which only motors are used for starting and low speed driving.

And during high-speed driving and acceleration/gradient driving, the motor assists the engine to drive the motor and the engine at the same time. In the section where the engine's efficiency is good, it runs only with the engine, and when the battery runs out, the battery is charged through the engine. You can drive while doing it. In addition, when the brake pedal is pressed or nothing is pressed, it charges in regenerative braking mode. In addition, when charging a high voltage battery in idle state, it is charged through HSG.

At this time, although not shown in FIG. 1, an engine controller (ECU) for controlling the engine, a motor controller (MCU) for controlling the motor, a transmission controller (TCU) for controlling the transmission, and each of the controllers (ECU) , MCU, TCU) may include a hybrid controller (HCU) for controlling the hybrid vehicle by linking.

For reference, the engine generates power by burning fuel, and the HSG generates electric energy by starting the engine or operating as a generator when the engine is started, and the clutch includes the engine and the motor (or Motor generator) to regulate the transmission of power between the engine and the motor. That is, the clutch connects or blocks power between the engine and the motor according to the switching between the EV (Electric Vehicle) mode and the HEV (Hybrid Electric Vehicle) mode.

The motor (or motor generator) is operated by a three-phase AC voltage applied from a battery through an inverter to generate torque, and the motor is operated as a generator when driving or regenerative braking to supply regenerative energy to the battery for charging. .

The battery consists of a plurality of unit cells, stores a high voltage for providing a driving voltage to the motor, supplies a driving voltage to the motor in EV mode or HEV mode, and is charged with a voltage generated by the motor during regenerative braking.

In the transmission, the sum of the output torque of the engine and the output torque of the motor determined according to the engagement and disengagement of the clutch is supplied as an input torque, and an arbitrary gear is selected according to the vehicle speed and operating conditions, and the driving force is output to the drive wheel. Drive.

The engine controller (ECU), not shown above, is connected to the hybrid controller (HCU) through a network, and is interlocked with the hybrid controller (HCU) to provide the driver's required torque signal, coolant temperature, engine speed, throttle valve opening, intake air volume, and oxygen volume. And the overall operation of the engine according to the engine operating state such as engine torque, and the engine controller (ECU) provides the operating state of the engine to the hybrid controller (HCU).

In addition, the motor controller (MCU) controls the driving and torque of the motor according to the control of the hybrid controller (HCU), stores the voltage generated from the motor during regenerative braking in the battery, and stores the driver's required torque signal and the driving mode of the vehicle. It controls the overall operation of the motor according to the state of charge (SOC) of the battery.

In addition, the transmission controller (TCU) controls the overall operation of the transmission, such as controlling the transmission ratio according to the output torque of the engine controller (ECU) and the motor controller (MCU), determining the amount of regenerative braking, etc., and hybridizing the operation state of the transmission. Provided to the controller (HCU).

In addition, the hybrid controller (HCU) (hereinafter, it can be simply described as the controller 120) is a top-level controller that controls the hybrid driving mode setting and the overall operation of the vehicle, and lower controllers (e.g., ECU, MCU) connected through a network , TCU) are integrated and controlled.

2 is an exemplary view schematically showing a shift control apparatus of a hybrid vehicle according to an embodiment of the present invention.

As shown in FIG. 2, the shift control apparatus of a hybrid vehicle according to the present embodiment includes a sensing unit 110, a control unit 120, and a transmission 130 for shift control of a P2 TMED type hybrid vehicle. do.

As described above, the control unit 120 (or hybrid controller (HCU)) is connected to sub-controllers (eg ECU, MCU, TCU) and senses connected to each controller (eg ECU, MCU, TCU). Through the unit 110, a plurality of vehicle information (eg, turbine speed (RPM), input torque, regenerative braking torque, vehicle speed, vehicle acceleration, etc.) is sensed.

The transmission 130 performs a shift according to the control of the control unit 120 (or hybrid controller (HCU)) by the driving force transmitted from the motor. More specifically, the control unit 120 controls the turbine speed gradient using a motor, calculates the amount of slip between the target gear for shifting and the turbine speed, and checks whether the specified minimum slip (rpm) satisfies the specified holding time. Perform shifting.

Hereinafter, the operation of the control unit 120 will be described with reference to FIGS. 3 and 4.

FIG. 3 is a flowchart illustrating a shift control method of a hybrid vehicle according to an embodiment of the present invention, and FIG. 4 is an exemplary diagram illustrating turbine speed and acceleration for each shift phase in FIG. 3 to be.

Referring to FIG. 3, the control unit 120 checks whether a lift foot up (LFU) shift is performed based on the position value of the accelerator pedal (S101).

As a result of the check (S101), if the lift put up shift (YES in S101), the controller 120 enters the SS (shift start) phase (refer to FIG. 4), and the sensing unit 110 Through this, a plurality of vehicle information (eg, turbine speed (RPM), input torque, regenerative braking torque, vehicle speed, vehicle acceleration, etc.) is detected (S102).

In addition, after entering the SS step, when a predetermined time (a first time) elapses, the controller 120 enters a shift begin (SB) phase (S103).

Here, from the SS (shift start) phase to the SB (shift begin) phase, the vehicle information for the shift is collected. And it is a section in which the actual shift is performed in the section from the SB (shift begin) phase to the SF (shift finish) phase, and the actual shift is completed from the detection (S101) of the lift foot up shift (LFU). The total shifting time (i.e., the time from SS to SF) until it becomes (i.e., to the SF step) is specified in advance.

Therefore, the controller 120 controls the slope of the turbine speed according to a predetermined pattern in order to stably shift within the specified total shift time (that is, the time from SS to SF step). (S104) (see Fig. 4(b)).

However, the graph shown in FIG. 4 is for aiding understanding of the invention, and the slope of the graph (eg, a graph of the rate of change of the target turbine speed) is partially exaggerated (ie, vertically), This should be understood as the largest slope (i.e. steep slope) of the controllable range.

For reference, (a) of FIG. 4 is a graph showing the change in turbine speed, and is a graph showing a state in which the turbine speed gradually decreases at a specified slope from the SB stage until the shift is completed. b) is a graph showing the rate of change of the turbine speed over time, the upper graph is the rate of change of the target turbine speed, and the lower graph follows the target through feedback control. This is the rate of change of the actual turbine speed.When the SB stage is entered, the turbine speed is reduced as fast as possible (first slope ①), and then constant (second time) until the specified time (second time). 2 Slope ②) It is a graph that decelerates slowly (third slope ③) after the specified time (second time), and Fig. 4(c) shows the motor for controlling the turbine speed. As a graph showing the control section, it is a graph showing that the motor is turned ON only in the section (SB ~ SF section) in which the actual shift is made.

Here, the first slope is a vertical slope, the second slope is a horizontal slope, and the third slope is a diagonal downward slope, and the magnitude of each slope is the first slope> the third slope> It is the second slope.

When the control of the inclination of the turbine speed is performed as described above, the controller 120 uses a motor to follow the rate of change of the target turbine speed through feedback control. Performs tilt control of the turbine speed.

In addition, the control unit 120 performs a slope control of the turbine speed between the target gear stage (e.g., if the current gear stage is 4 stage, the target gear stage 5 stage) and the turbine speed. The slip amount is calculated (S105).

Through the calculation of the slip amount, when the calculated slip amount becomes the designated minimum slip amount (rpm), and the minimum slip amount is maintained (satisfied) for a predetermined time (ie, the designated holding time), the shift is completed (S106).

At this time, feedback control is performed by repeating steps S104 to S106 until the calculated slip amount satisfies the specified minimum slip amount (rpm) the specified retention time.

Accordingly, referring to FIG. 4(b), a difference occurs between the rate of change of the target turbine speed and the rate of change of the actual turbine speed following it, but this difference is the feedback. By being supplemented through control, the shift is finally stably completed in the SF stage.

As described above, this embodiment enables precise control of the turbine speed by utilizing the fast response of the motor, and by directly controlling the turbine speed through the motor, the shifting time is shortened and stable shifting is achieved. It has the effect of improving the feeling of shifting.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is only an example, and various modifications and other equivalent embodiments are possible from those of ordinary skill in the field to which the technology pertains. I will understand the point. Therefore, the technical protection scope of the present invention should be determined by the following claims. Also, the implementation described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream or a signal. Although discussed only in the context of a single form of implementation (eg, only as a method), the implementation of the discussed features may also be implemented in other forms (eg, an apparatus or program). The device may be implemented with appropriate hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which generally refers to a processing device including, for example, a computer, a microprocessor, an integrated circuit or a programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

110: sensing unit
120: control unit
130: transmission

Claims (11)

A sensing unit for sensing vehicle information of a P2 TMED (Transmission Mounted Electric Device) type hybrid vehicle; And
When shifting Lift Foot Up (LFU), a motor is used to control the slope of the turbine speed of the transmission, calculates the amount of slip between the target gear stage and the turbine speed for shifting, and calculates the specified minimum slip amount. A shift control device for a hybrid vehicle comprising: a control unit that completes the shift when the specified holding time is satisfied.
The method of claim 1, wherein the control unit,
Check the shift of the lift foot up (LFU) based on the position value of the accelerator pedal,
In the case of a lift put-up shift, the shift control apparatus of a hybrid vehicle, wherein the vehicle enters a shift start (SS) phase and detects information on a plurality of vehicles designated through the sensing unit.
The method of claim 2, wherein the control unit,
After entering the SS (shift start) phase, when a predetermined first time elapses, the SB (shift begin) phase is entered, and the SB (shift begin) phase is the SF (shift finish) phase The shift is performed in the section up to (phase),
It is a section for collecting vehicle information for shifting from the SS (shift start) phase to the SB (shift begin) phase, and the SF (shift finish) phase in the SB (shift begin) phase ( phase) is the section in which the actual shifting takes place,
The shift control apparatus for a hybrid vehicle, wherein the total shift time from the SS step to the SF step is predetermined.
The method of claim 3, wherein the control unit,
In order to perform shifting stably, control the slope of the turbine speed of the transmission according to a predetermined pattern,
Control of the slope of the turbine speed,
The hybrid vehicle, characterized in that the control unit controls the motor to perform a slope control of the turbine speed to follow a rate of change of a target turbine speed through feedback control. Shift control device.
The method of claim 3, wherein the control unit,
When entering the SB stage, after decelerating at the rate of change of the turbine speed according to the first slope, the speed is reduced at the rate of change of the turbine speed according to the second slope until the designated second time, After 2 hours, it is to control the slope of the turbine speed according to the pattern of decelerating at the rate of change of the turbine speed according to the third slope,
The first slope is a vertical slope, the second slope is a horizontal slope, and the third slope is a diagonal downward slope, and the magnitude of each slope is the first slope> the third slope> the second slope. 2 Shift control device of a hybrid vehicle, characterized in that inclination.
The method of claim 1, wherein the control unit,
Calculating the amount of slip between the target gear stage and the current turbine speed while performing slope control of the turbine speed,
The shift control apparatus of a hybrid vehicle, characterized in that when the calculated slip amount becomes a designated minimum slip amount and the minimum slip amount is maintained for a predetermined time, the shift is completed.
Checking whether the control unit of the P2 TMED (Transmission Mounted Electric Device) type hybrid vehicle shifts a lift foot up (LFU) based on the position value of the accelerator pedal;
In case of a lift put-up (LFU) shift, the control unit enters a shift start (SS) phase and detects information on a plurality of designated vehicles; And
After entering the SS (shift start) phase, when a predetermined first time elapses, the SB (shift begin) phase is entered, and the SB (shift begin) phase is the SF (shift finish) phase The shift control method of a hybrid vehicle comprising a; performing a shift in the section up to the (phase).
The method of claim 7,
It is a section for collecting vehicle information for shifting from the SS (shift start) phase to the SB (shift begin) phase,
From the SB (shift begin) phase to the SF (shift finish) phase, the actual shift is performed,
The shift control method of a hybrid vehicle, characterized in that the total shift time from the SS step to the SF step is specified in advance.
The method of claim 7, wherein in order to perform a shift in a section from the SB (shift begin) phase to the SF (shift finish) phase,
The control unit,
Control of the slope of the turbine speed of the transmission according to a predetermined pattern,
Control of the slope of the turbine speed,
A hybrid vehicle, characterized in that the control unit controls the motor to perform a slope control of the turbine speed to follow a rate of change of a target turbine speed through feedback control. Shift control method.
The method of claim 7, wherein in order to perform a shift in a section from the SB (shift begin) phase to the SF (shift finish) phase,
The control unit,
When entering the SB stage, after decelerating at the rate of change of the turbine speed according to the first slope, the speed is reduced at the rate of change of the turbine speed according to the second slope until the designated second time, After 2 hours, it is to control the slope of the turbine speed according to the pattern of decelerating at the rate of change of the turbine speed according to the third slope,
The first slope is a vertical slope, the second slope is a horizontal slope, and the third slope is a diagonal downward slope, and the magnitude of each slope is the first slope> the third slope> the second slope. 2 Shift control method of a hybrid vehicle, characterized in that inclination.
The method of claim 7, wherein in order to perform a shift in a section from the SB (shift begin) phase to the SF (shift finish) phase,
The control unit,
Calculating a slip amount between a target gear stage and a current turbine speed while performing gradient control of the turbine speed; And
And completing shifting when the calculated slip amount becomes a specified minimum slip amount and the minimum slip amount is maintained for a predetermined time.

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