KR20200142165A - Clutch control method for vehicle - Google Patents

Abstract

The present invention includes the steps of: acquiring, by a controller, traffic information around a vehicle; determining, by the controller, whether the vehicle is stopped by a traffic light from the traffic information; and cancelling clutch current variable control when the lighting remaining time of the green light of the traffic light is less than a predetermined threshold time in case there is no vehicle in the front by determining whether there is a vehicle in the front when the vehicle is stopped by the traffic light.

Description

Vehicle clutch control method {CLUTCH CONTROL METHOD FOR VEHICLE}

The present invention relates to a method for controlling a clutch of a vehicle, and more particularly, to a technology for controlling a clutch of a transmission.

In the TMED (Transmission Mounted Electric Device) hybrid powertrain, the motor is mounted on the transmission side, the motor and the engine are connected by an engine clutch, and the transmission may be composed of a dual clutch transmission (DCT), and the DCT includes the Two separate shift clutches (hereinafter simply referred to as "clutches") that are distinct from the engine clutch are provided to enable smooth shifting.

Among the transmissions, the clutch used for DCT is usually a normally open type in which the clutch is released when the control current is supplied and the clutch is released in the basic state in which no electricity is supplied from the outside.

Therefore, while the control current is not supplied, the clutch is opened by the elastic force of the spring, and only when the control current is supplied, the engagement force of the clutch is controlled according to the magnitude of the control current.

When the vehicle is stopped, the clutch of the transmission does not need to be engaged, and thus blocking the current supplied to the clutch can improve fuel economy or fuel economy, and increase the mileage of the vehicle.

The so-called'clutch current variable control' in consideration of these characteristics is basically to cut off the current supplied to the clutch as much as possible when the vehicle is stopped, and the measured value of the APS (Accelerator Position Sensor) that detects the accelerator pedal operation amount is 0. %, when the measured value of the brake pedal position sensor (BPS), which detects the amount of brake pedal operation, is more than 20%, it is allowed to enter. In addition, the entry is made only when the road slope is below a predetermined level, or the D-range ECO mode By allowing the vehicle to enter the control according to the conditions of the vehicle, such as only entering the back, thereby preventing unnecessary power consumption from the clutch, the fuel economy of the vehicle is improved and the driving distance is increased.

However, when the clutch current variable control is performed, when the driver requests a sudden vehicle start while the clutch of the transmission is released, it takes time to engage the clutch, so when the clutch is continuously engaged. In contrast, when the starting response is poor and the amount of depression of the accelerator pedal is large, the marketability of the vehicle may decrease due to a lunge phenomenon in the process of satisfying the required torque after clutch engagement.

The matters described as the background technology of the present invention are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art. Will be

KR 10-2005-0100174 A KR 10-1519297 B1 KR 10-1601770 B1 KR 10-1795177 B1 KR 10-2017-0128545 A

The present invention improves fuel economy and increases mileage by reducing power consumption through efficient control of the clutch through the clutch current variable control, while improving the vehicle's start responsiveness through a faster response to the driver's will to accelerate. It is an object of the present invention to provide a method for controlling a clutch of a vehicle so that the marketability of the vehicle can be improved by securing it.

The clutch control method of a vehicle of the present invention for achieving the above object,

Obtaining, by the controller, traffic information around the vehicle;

Determining, by the controller, whether the vehicle is stopped by a traffic light from the traffic information;

When the vehicle is stopped by a traffic light, it is determined whether there is a vehicle in front, and when there is no vehicle in front, the clutch current variable control is canceled when the remaining time remaining on the green light of the traffic light is less than a predetermined threshold time. Step to do;

It characterized in that it is configured to include.

In the present invention, when it is determined that there is a vehicle in front when the vehicle is stopped by a traffic light, the speed of the vehicle in front exceeds a predetermined first critical vehicle speed, or the distance to the vehicle in front exceeds a predetermined critical inter-vehicle distance. If exceeded, the controller may be configured to further include the step of releasing the clutch current variable control.

In the present invention, in a situation where the vehicle is stopped by a traffic light, it is determined that there is a vehicle in front, and the speed of the vehicle in front is less than or equal to the first critical vehicle speed, and the distance to the vehicle in front is less than or equal to the critical inter-vehicle distance. When the brake lamp of the vehicle in front is turned off, the controller may further include releasing the clutch current variable control.

The present invention includes the steps of determining, by the controller, whether a vehicle is traveling on a highway or a national highway from the traffic information;

When the vehicle is traveling on a highway or a national highway, and if the congestion degree of the corresponding road exceeds a predetermined threshold congestion degree, the controller prohibiting the clutch current variable control;

It may be configured to further include.

In the present invention, when a vehicle is driving on a highway or a national highway, the congestion of the road is less than or equal to the critical congestion degree, but if the distance between the vehicle and the toll gate is less than a predetermined threshold gate distance, the controller prohibits the clutch current variable control. It may be configured to further include a step.

The present invention may further include the step of determining, from the traffic information, whether the vehicle is located in a parking potency, and prohibiting the clutch current variable control when the vehicle is located in a parking potency.

The parking lot may include a navigation destination, a parking lot, and a rest area.

In addition, the invention vehicle clutch control method for achieving the above object,

Obtaining, by the controller, vehicle interior information;

When the controller confirms that the D range is selected from the vehicle internal information, prohibiting the clutch current variable control by the controller;

Maintaining the clutch current variable control prohibition state while the vehicle speed is less than or equal to a predetermined second critical vehicle speed after the D range selection time point;

It characterized in that it is configured to include.

The present invention includes the steps of allowing the clutch current variable control when the vehicle speed exceeds the second critical vehicle speed after the D range selection time point;

It may be configured to further include.

The present invention may further include the step of inhibiting the clutch current variable control when the controller determines whether the PAS (Parking Assist System) is operating from the vehicle internal information, and when the PAS is operating.

The present invention improves fuel economy and increases mileage by reducing power consumption by efficiently controlling the clutch used in the transmission of a vehicle by controlling the clutch current variable, while the vehicle starts with a more rapid response to the driver's will to accelerate. By ensuring excellent responsiveness, it is possible to improve the marketability of the vehicle.

1 is a configuration diagram of a vehicle to which the present invention can be applied,
2 is a block diagram illustrating the concept of hardware implementing a control method according to the present invention;
3 to 6 are flowcharts each showing the first to fourth embodiments of the present invention.

1 is a diagram showing a configuration of a hybrid vehicle of the TMED method to which the present invention can be applied, the power of the engine E is connected to the motor M through the engine clutch EC, and the rotation shaft of the motor M is It is inputted through the two clutches CL of the DCT and shifted, and is then pulled out to the driving wheel W.

The engine is controlled by an ECU (Engine Control Unit), the motor (M) is controlled by a MCU (Motor Control Unit), and the DCT is controlled by a TCU (Transmission Control Unit), these ECUs, MCUs, The TCU is configured to be controlled and controlled by the host controller HCU.

2 is a block diagram showing the concept of the hardware implementing the control method according to the present invention, HCU is a traffic light information, RADAR information, front camera signal, gear stage, road type information, road congestion information and PAS operation, etc. It receives information and communicates with the TCU to control whether to allow or release the clutch current variable control through a corresponding flag.

In Fig. 2, the HCU receives the clutch current variable control flag value from the TCU and recognizes that the clutch current variable control is being executed, based on the above various information, the traffic light stop condition determination unit, the gear stage change determination. A situation in which the clutch current variable control is canceled when the start of the vehicle is predicted sooner or later by synthesizing the contents determined by the unit, the road condition determining unit, and the parking condition determining unit in the start prediction unit.

In each embodiment to be described later, the controller may be the HCU, and of course, a controller separate from the HCU may be configured.

3 is a flowchart showing a first embodiment of a method for controlling a clutch of a vehicle according to the present invention, comprising: a step (S11) of obtaining traffic information around the vehicle by a controller; Determining, by the controller, whether a vehicle is stopped by a traffic light from the traffic information (S12); When the vehicle is stopped by a traffic light, it is determined whether there is a vehicle in front, and when there is no vehicle in front, when the remaining time of the green light lighting of the traffic light is less than a predetermined threshold time (S13), the clutch current is variable. And releasing control.

That is, when the vehicle is performing the clutch current variable control while the vehicle is waiting for the signal, when there is no vehicle in front, the remaining time for lighting the green light becomes smaller than the threshold time and the green light is immediately turned on. In this case, the clutch current variable control is released to pre-fasten the clutch, so that a rapid vehicle start can be implemented when the driver requests a start, so that the vehicle start response can be excellently secured.

Therefore, the critical time may be determined designally suitable for the vehicle by experiment and analysis according to the purpose of generating the above-described actions and effects, which is 1 greater than the time required for clutch recombination. It could be set like seconds, 2 seconds, etc.

Traffic information around the vehicle can be obtained through precise traffic information of the navigation, and whether or not a vehicle is present in front can be confirmed through a signal from a RADAR installed on the vehicle, and the remaining time of the green light of the traffic light It can be obtained through precise traffic information of the navigation.

In addition, in the present embodiment, when it is determined that the vehicle in front of the vehicle is stopped by a traffic light, the speed of the vehicle in front exceeds a predetermined first critical vehicle speed or the distance to the vehicle in front is If the threshold distance is exceeded (S14), the controller is configured to further include the step of releasing the clutch current variable control.

That is, the controller performs clutch current variable control while the vehicle is waiting for a signal, and when there is a vehicle in front, the vehicle in front starts and the speed exceeds the first critical vehicle speed, or the distance is between the critical vehicles. When the distance is exceeded, the clutch current variable control is released in advance before the driver steps on the accelerator pedal, and the clutch is already engaged at the time the driver starts to step on the accelerator pedal, so that the vehicle starts immediately, thereby ensuring normal start response. To be able to do it.

Therefore, the first critical vehicle speed and the distance between the critical vehicles may be determined designally suitable for the vehicle by experiment and analysis according to the purpose of generating the above-described actions and effects. The critical vehicle speed may be set to, for example, 5 kph, or the like, and the critical vehicle distance may be set to 3 m, 5 m, or the like.

For reference, the critical difference distance can be used in two meanings. For example, when the critical inter-vehicle distance is set to 3m, and the vehicle stops 2m from the front vehicle as an initial situation, the vehicle in front is first moved by more than 1m from the initial situation. When the distance between the vehicle and the front vehicle exceeds the critical vehicle distance of 3m, it can be used as a meaning to release the clutch current variable control.Secondly, the vehicle in front moves beyond 3m from the initial situation and When the distance between the vehicle and the vehicle in front exceeds 5m, it may also be used to cancel the clutch current variable control.

In addition, in this embodiment, it is determined that a vehicle is present in the front when the vehicle is stopped by a traffic light, and the speed of the vehicle in front is less than the first critical vehicle speed, and the distance to the vehicle in front is less than the critical inter-vehicle distance. In the situation, when the brake lamp of the front vehicle is turned off (S15), the controller is configured to further include the step of releasing the clutch current variable control.

That is, the controller performs clutch current variable control while the vehicle is waiting for a signal, and when there is a vehicle in front, the vehicle speed of the front vehicle or the distance between the vehicle in front of the vehicle in front is the first critical vehicle speed, respectively. And even if it does not reach the critical inter-vehicle distance, if the braking light of the vehicle in front is turned off, the vehicle in front will immediately start, and accordingly, it is possible to know that the vehicle in question is imminent, so that the clutch current variable control is released in advance, This is to ensure sufficient vehicle start response.

Of course, this step may be omitted depending on whether or not the camera mounted on the vehicle can recognize the brake lamp and the control purpose.

In addition, a signal from the camera indicating whether the brake lamp is turned off may be used to correct the first critical vehicle speed and the critical inter-vehicle distance in real time. In other words, when the vehicle in front moves forward by creeping for a very short time in order to shorten the distance from the vehicle in front of a stop at a traffic light, the brake lights may be turned off. So, if the vehicle in front starts, it will be possible to ensure faster responsiveness.

On the other hand, when the controller determines from the traffic information that the destination on the vehicle's navigation is a hospital or an emergency room, prohibiting the clutch current variable control may be further included.

That is, in a situation where urgent vehicle movement is required, such as in a hospital or an emergency room, the clutch current variable control is prohibited, so that even a little help is achieved for a faster vehicle movement.

To the same effect, it would be desirable to prohibit the clutch current variable control even in a situation where the driver turns on the emergency light and runs.

In addition, when the controller determines that a fire engine or an emergency vehicle approaches the vehicle, releasing the clutch current variable control may be further included.

In other words, it allows the driver to open the way to the fire engine or emergency vehicle more quickly.

At this time, the controller may recognize the siren sound of the emergency vehicle and determine the approach of the fire engine and the emergency vehicle.

In addition, when the vehicle is located in a place where dynamic driving is expected such as a driving CIRCUIT, such information is checked from navigation information, etc., and the clutch current variable control is prohibited, thereby ensuring excellent starting performance of the vehicle. It would be desirable.

4 is a flow chart illustrating a second embodiment according to the present invention, wherein the controller determines from the traffic information whether a vehicle is traveling on a highway or national highway (S21); When the vehicle is traveling on a highway or a national highway, if the congestion degree of the corresponding road exceeds a predetermined threshold congestion degree (S22), the controller prohibits the clutch current variable control.

That is, when a vehicle is driving on a road with less traffic lights than an urban road, such as a highway or a national highway, when the road congestion exceeds the critical congestion level, the clutch current variable control is prohibited, thereby preventing frequent acceleration/deceleration and starting situations. By making it possible to prepare, it is to ensure smooth and rapid vehicle start response in the case of frequent start on a congested road.

Of course, information on a road being driven, such as a highway or national highway with few traffic lights, and a degree of congestion of the road can be obtained through precise traffic information of the navigation as described above.

The critical congestion degree may be determined in a design suitable for the vehicle by experiment and analysis, according to the purpose of generating the above-described actions and effects.

In addition, in this embodiment, when the vehicle is driving on a highway or national highway, the congestion degree of the road is less than or equal to the critical congestion degree, but if the distance between the vehicle and the toll gate is less than a predetermined threshold gate distance (S23), the controller And inhibiting the clutch current variable control.

That is, when the vehicle is traveling in the toll gate section of the expressway, starting again is expected within a short time even if the vehicle stops. Therefore, the clutch current variable control is prohibited and the clutch is kept in the engaged state, so that the vehicle starts during subsequent starts. It is to ensure sufficient responsiveness.

Therefore, the critical gate distance may be determined designally suitable for the vehicle by experiment and analysis according to the purpose of generating the above-described actions and effects, for example, to be set as 100m, 500m, etc. I will be able to.

5 is a diagram illustrating a third embodiment according to the present invention, wherein the controller determines from the vehicle internal information whether the PAS is operating (S31), and when the PAS is operating, prohibits the clutch current variable control. It consists of steps.

That is, in a situation in which the detection signal of the ultrasonic sensor in front of the vehicle is provided to the driver by the operation of the PAS, it can be determined as a parking situation, and thus the clutch current variable control is prohibited.

In addition, the present embodiment further comprises the step of inhibiting the clutch current variable control when the controller determines whether the vehicle is located in the parking stronghold from the traffic information, and when the vehicle is located in the parking stronghold (S32). do.

Here, the parking prominence means a place where the possibility of parking of the vehicle is very high, such as a navigation destination, a parking lot, and a rest area.

That is, if it is determined from the traffic information that the vehicle is located in such a parking stronghold, the clutch current variable control is prohibited.

6 illustrates a fourth embodiment according to the present invention, comprising: a step (S41) of obtaining vehicle interior information by the controller; When the controller confirms that the D range is selected from the vehicle internal information (S42), the controller prohibiting the clutch current variable control (S43); And maintaining the clutch current variable control prohibition state while the vehicle speed is less than or equal to a predetermined second critical vehicle speed after the D range selection time point.

In other words, the fact that the driver has previously selected the D range from another shift range can be considered as an active expression of the driver's willingness to start. Therefore, when the D range is selected, the clutch current variable control is first prohibited, and then the vehicle starts the second critical vehicle speed. The clutch current variable control is continuously inhibited until acceleration exceeds the level, so that the driver's starting request can be immediately responded.

Of course, if the vehicle speed exceeds the second critical vehicle speed after the D-range selection point (S44), a step of allowing the clutch current variable control (S45) is further provided to generate electric energy due to the natural action of the clutch current variable control. It should be able to achieve the effect of reducing

Therefore, the second critical vehicle speed may be determined in a design suitable for the vehicle by experiment and analysis according to the purpose of generating the above-described actions and effects, for example, 10kph, 20kph, etc. Could be set.

Although the present invention has been illustrated and described with reference to specific embodiments, it is understood in the art that the present invention can be variously improved and changed within the scope of the technical spirit of the present invention provided by the following claims. It will be obvious to a person of ordinary knowledge.

E; engine
EC; Engine clutch
M; motor
CL; clutch
W; Drive wheel

Claims (12)

Obtaining, by the controller, traffic information around the vehicle;
Determining, by the controller, whether the vehicle is stopped by a traffic light from the traffic information;
When the vehicle is stopped by a traffic light, it is determined whether there is a vehicle in front, and when there is no vehicle in front, the clutch current variable control is canceled when the remaining time remaining on the green light of the traffic light is less than a predetermined threshold time. Step to do;
Clutch control method of a vehicle, characterized in that configured to include. The method according to claim 1,
When it is determined that there is a vehicle in front when the vehicle is stopped by a traffic light, the speed of the vehicle in front exceeds a predetermined first critical vehicle speed, or when the distance to the vehicle in front exceeds a predetermined threshold inter-vehicle distance, Releasing the clutch current variable control by the controller
Clutch control method of a vehicle, characterized in that configured to further include. The method according to claim 2,
When the vehicle is stopped by a traffic light, it is determined that there is a vehicle in front, the speed of the vehicle in front is less than the first critical vehicle speed, and the distance to the vehicle in front is less than the critical inter-vehicle distance. When the brake light is turned off, the controller releasing the clutch current variable control;
Clutch control method of a vehicle, characterized in that configured to further include. Obtaining, by the controller, traffic information around the vehicle;
Determining, by the controller, whether a vehicle is traveling on a highway or a national highway from the traffic information;
When the vehicle is traveling on a highway or a national highway, and if the congestion degree of the corresponding road exceeds a predetermined threshold congestion degree, the controller prohibiting the clutch current variable control;
Clutch control method of a vehicle, characterized in that configured to include. The method of claim 4,
When the vehicle is traveling on a highway or a national highway, the controller prohibits the clutch current variable control if the road congestion is less than the critical congestion degree, but the distance between the vehicle and the toll gate is less than a predetermined threshold gate distance;
Clutch control method of a vehicle, characterized in that configured to further include. The method according to claim 1,
Determining whether the vehicle is located in the parking stronghold from the traffic information, and prohibiting the clutch current variable control when the vehicle is located in the parking stronghold;
Clutch control method of a vehicle, characterized in that configured to further include. The method of claim 6,
The parking prominence includes a navigation destination, a parking lot, and a rest area.
Clutch control method of a vehicle, characterized in that. Obtaining, by the controller, vehicle interior information;
When the controller confirms that the D range is selected from the vehicle internal information, prohibiting the clutch current variable control by the controller;
Maintaining the clutch current variable control prohibition state while the vehicle speed is less than or equal to a predetermined second critical vehicle speed after the D range selection time point;
Clutch control method of a vehicle, characterized in that configured to include. The method of claim 8,
Allowing the clutch current variable control when the vehicle speed exceeds the second critical vehicle speed after the D range selection time point;
Clutch control method of a vehicle, characterized in that configured to further include. The method of claim 8,
Determining whether the PAS is operating from the vehicle internal information, and prohibiting the clutch current variable control when the PAS is operating;
Clutch control method of a vehicle, characterized in that configured to further include. The method according to claim 1,
Prohibiting the clutch current variable control when the controller determines from the traffic information that the destination on the vehicle's navigation is a hospital or an emergency room, or when an emergency light is turned on in the vehicle;
Clutch control method of a vehicle, characterized in that configured to further include. The method according to claim 1,
When it is determined that a fire engine or an emergency vehicle approaches the vehicle, the controller releasing the clutch current variable control;
Clutch control method of a vehicle, characterized in that configured to further include.

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