KR101866030B1 - Method for parking control of vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a parking control method for a vehicle, and more particularly, to a parking control method for a vehicle which can maintain a stable vehicle stop state when the operation of a parking brake is not possible, The main purpose is to provide. To achieve the above object, there is provided a method for controlling an electronic parking brake (EPB) Confirming the shift lever position when the EPB operating state is in the braking release state; Determining whether the vehicle is in the ignition off state (IGN OFF) when the shift lever is located at the parking position; Determining whether the vehicle speed meets a condition of a stop state when the vehicle is in a start-off state; And controlling the operation of the EPB to generate a braking force for restricting the wheels when the condition of the stopped state is satisfied.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to an apparatus and method for detecting an engine tuning of a vehicle, and more particularly, to an apparatus and method for detecting an engine tuning of a vehicle that can stably maintain a vehicle in a stopped state when the driving system parking brake is inoperable, The present invention relates to a parking control method for a vehicle.

As is known, an automatic transmission is a transmission that automatically implements an appropriate gear stage (speed change stage) based on variables related to vehicle driving such as vehicle speed and throttle opening amount.

A shift lever for specifying a gear shift range such as P (parking), R (reverse), N (neutral), D (running), +, -, etc. is connected to the automatic transmission for a vehicle , The shift lever is a rod that connects the transmission with the driver's operation for gear shifting and is also referred to as a transmission gear shift lever (TGS).

The position of the manual valve of the automatic transmission is determined by the operation of the shift lever, and an appropriate hydraulic pressure supply line is formed according to the position of the shift lever. The position of the manual valve is detected by an inhibitor switch, (Hereinafter referred to as " TCU ").

Therefore, the TCU controls the hydraulic system of the automatic transmission so that an appropriate gear is established in the driving mode designated by the driver.

When the automatic shift control is provided with a manual up (+) / down (-) function, the shift position of the shift lever is controlled by the CAN And transmitted to the TCU through communication to control the shifting to the corresponding target gear stage.

The shift lever of the automatic transmission usually displays the position of the shift lever, such as P, R, N, D, in the character portion of the PRND indicator with the light to visually inform the driver of the position of the shift lever.

1 shows an example of a straight type in which the shift lever can be moved to any one of the positions P, R, N, and D by operating only the front and rear straight lines without operating the left and right shifts of the shift lever 1 as one of the shift types of the shift lever. Giving.

In this straight type shift lever structure, when the driver operates the button 2 of the shift lever 1 without operating the brake pedal during the vehicle running, shifting is possible.

In particular, it is possible for the driver to move the position of the shift lever 1 from the driving end (D-stage or R-end) to the P-end during driving of the vehicle. Normally, the driver depresses the brake pedal to decelerate the vehicle, It should be moved.

However, before the vehicle decelerates, the shift lever 1 can be operated to the P-stage position, and in a vehicle to which the straight type shift lever is applied, when the driver accidentally moves the shift lever from the D-stage to the P- It can easily happen.

In this way, during the forced P stage assembly during the running of the vehicle, noise and shock may be generated in the gear portion of the transmission, thereby causing the driver to feel anxiety.

Particularly, when the vehicle moves from a state in which the speed of the vehicle is high to the P stage, a shock is applied to a power train (PT) such as an engine and a transmission.

In addition, if the driver inadvertently shifts the shift lever from the D-stage to the P-stage, the driver's parking brake may be damaged. In this case, the driver parked the vehicle with the P- Accidents may occur due to vehicle jamming.

FIG. 2 is a view for explaining that the parking brake of the driving system can be broken during the P-stage operation while the vehicle is running. Since the parking gear 4 rotates at high speed during traveling, the driver mistakenly shifts the shift lever from the D- The breakage may occur when the operating rod 5 moves and the parking mechanism 6 is engaged with the parking gear 4.

In the event of such a breakdown, the parking brake can not be operated at the time of actual parking, and the vehicle will be thrown at the time of parking on the ramp.

To solve this problem, a shift lock structure that prevents the shift lever from being erroneously operated to the P-stage by the driver during running can be added, for example, a shift lock solenoid mechanism for preventing N → P shift during traveling, There is a problem that the cost is further increased.

On the other hand, a shift lever of SBW (Shift By Wire) type is mainly used in high-end automobiles and electric vehicles. In this SBW shift lever, the operating state is communicated to the controller through communication.

In case of SBW shift lever, since it is not a mechanically connected structure, when the communication or electric fail occurs, the driver's parking brake can not be operated because the driver does not recognize the input P-stage.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle parking brake system capable of stably maintaining a vehicle in a stopped state when the operation of the parking brake is not possible, And a control method.

Further, according to the present invention, when the failure of the driving system parking brake occurs, or when the SBW shift lever is in a communication disabled state, the vehicle is maintained in a stationary state The present invention relates to a parking control method for a vehicle.

According to an aspect of the present invention, there is provided a method for controlling an electronic parking brake (EPB) Confirming the shift lever position when the EPB operating state is in the braking release state; Determining whether the vehicle is in the ignition off state (IGN OFF) when the shift lever is located at the parking position; Determining whether the vehicle speed meets a condition of a stop state when the vehicle is in a start-off state; And controlling the operation of the EPB to generate a braking force for restricting the wheels when the condition of the stop state is satisfied.

According to another embodiment of the present invention, there is provided a method for controlling an electronic parking brake (EPB) Checking whether the SBW (Shift By Wire) shift lever has failed if the EPB operating state is the brake release state; Determining whether the vehicle is in the ignition off state (IGN OFF) when the SBW shift lever is in a fault state; Determining whether the vehicle speed meets a condition of a stop state when the vehicle is in a start-off state; And controlling the operation of the EPB to generate a braking force for restricting the wheels when the condition of the stop state is satisfied.

Thus, according to the parking control method for a vehicle according to the present invention, when the driving system parking brake can not be operated, the electronic parking brake (EPB) can be used to stably maintain the vehicle in a stopped state, .

Further, in the parking control method of a vehicle according to the present invention, the electronic parking brake mounted on the vehicle is installed without additional hardware only by applying a simple control logic, and when the predetermined condition is satisfied, the vehicle is automatically maintained in a stopped state, It is possible to prevent an accident caused by the vehicle jamming even in the case where a failure of the parking brake occurs or an SBW shift lever communication disabled state.

1 is a diagram illustrating a straight type shift lever.
2 is a view for explaining that the driving system parking brake may be broken in the P-stage operation while the vehicle is running.
3 is a schematic view showing a configuration of an EPB system used for generating a parking braking force in the present invention.
4 is a block diagram of a system configuration for performing the parking control process of the present invention.
5 is a flowchart showing a parking control process of a vehicle according to the first embodiment of the present invention.
6 is a flowchart showing a parking control process of a vehicle according to a second 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 skilled in the art can easily carry out the present invention. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

The present invention can stably maintain the vehicle in a stopped state when the driving system parking brake can not be operated, such as when the driving system parking brake fails or when the SBW shift lever communication is disabled only by applying a simple control logic, The present invention provides a parking control method for a vehicle that can prevent the vehicle from being thrown.

If the parking brake is broken in a driving system (electric vehicle) such as an electric vehicle, when the driver stops the vehicle on the ramp and then operates the shift lever with the P-stage, even a small gradient may cause vehicle jolt and lead to a car accident.

Further, when the SBW shift lever is in the communication disabled state in the vehicle equipped with the SBW shift lever, even if the driver inputs the P-stage after the vehicle is stopped, the controller does not recognize the SBW shift lever. Therefore, the drive system parking brake is not operated, May occur.

According to the present invention, when the driver stops the vehicle for parking purposes, the ECU determines the driver's intention to park the vehicle, and automatically generates an electronic parking brake (EPB) mounted on the vehicle to generate a parking braking force to prevent the vehicle from moving.

In addition, according to the present invention, an operation of an electronic parking brake is automatically controlled so as to generate a parking braking force by determining driver's will to be determined from information collected in a vehicle and satisfying a predetermined condition.

FIG. 3 is a schematic view showing a configuration of an EPB system used for generating a parking braking force in the present invention. A recent electronic parking brake (EPB) system includes a caliper and the caliper 20 is operated under the control of the EPB controller 10 to generate a braking force by pressing the disk 22 mounted to rotate with the vehicle wheel.

That is, the caliper 20 including the caliper housing, the piston, and the friction pad is operated by using a mechanical mechanism driven by an electric motor to generate the braking force. When the EPB controller drives the motor as the EPB actuator, The rotational force is converted into a linear force and transmitted to the piston in the cylinder of the caliper housing. When the piston moves and presses the friction pad, the friction pad presses and clamps both surfaces of the disk 22 to generate braking force.

4 is a block diagram of a system configuration for performing a parking control process according to the present invention. FIG. 5 is a flowchart illustrating a parking control process of a vehicle according to the first embodiment of the present invention. Fig.

FIG. 5 shows an EPB automatic engaging process capable of solving the problem that occurs when a driving system parking brake breaks down.

First, the EBP controller confirms the current EPB operating state from the memory (EPB EEPROM) (S11).

At this time, when the EPB operating state is the brake release state, the EPB controller 10 transmits the shift lever position information (i.e., gear position information) operated by the driver to an upper controller, for example, a VCU (Vehicle Control Unit) (Not shown).

Here, the EPB released state means a state in which each caliper (20 in Fig. 3) mounted on the vehicle wheel in the EPB system is not generating a braking force (i.e., released state), and in the above- A state in which the pressing of the piston against the friction pad is released, and a state in which the clamping (not friction) of the friction pad with respect to the disk (22 in Fig. 3) is released.

Then, the EPB controller 10 determines whether the shift lever is in the P-stage (parking position) from the shift lever position information (S12). If it is determined that the shift lever is located at the P-stage, (S13).

At this time, the EPB controller 10 receives the battery voltage (IGN voltage) and the ignition switch information through the EPB wiring connected to the vehicle battery and determines whether the driver has actually turned off the ignition, (IGN OFF) state.

If the ignition off (IGN OFF) signal is input from the ignition switch while the battery voltage (IGN Voltage) is lower than the set voltage, it is determined that the ignition is off.

On the other hand, when the ignition on (IGN ON) signal input from the ignition switch is maintained for a predetermined time (for example, 2 seconds) while the battery voltage is lower than the set voltage (for example, 5V), it is determined as an error.

If it is determined that the EPB controller 10 is in the ignition-off state, the EPB controller 10 determines whether the EPB is released by the driver operation (S14)

That is, after confirming the operation state of the EPB button (9 in FIG. 3), if the operation state of the EPB button 9 is the EPB braking release state, the logic is terminated without performing the EPB engagement.

When the driver wishes to perform parallel parking in N stages so that the vehicle can be pushed down due to a lack of parking space, a mode is required to prevent the EPB from being automatically engaged. Therefore, when the driver turns off the engine with the EPB button (9) In this case, the EPB is not automatically closed.

On the other hand, if the EPB button 9 is not in the released state, that is, if the EPB button 9 is in the Apply and Neutral positions, the EPB controller 10 determines whether the vehicle is in a stop state (S15).

In the present invention, EPB automatic locking is performed only when the vehicle is stopped. If the EPB is locked in a vehicle speed state, the EPB normally generates braking force only in the rear wheel. Therefore, Problems such as vehicle spin may occur.

In order to prevent such a situation, the EPB controller 10 determines that the vehicle is in a stopped state only when the wheel speeds correspond to the stopping speeds, that is, when the wheel speeds of all the four wheels are less than the stopping reference speed, from the wheel speed information of the four wheels It is preferable that the EPB is set to be automatically determined.

Here, the stop reference speed is a threshold speed set in advance so as to determine that the vehicle is in a stop state when the stop reference speed is less than the wheel speed, for example, may be set to 0.5 km / h.

If the EPB controller 10 determines in step S15 that the vehicle is in a stop state, it automatically engages the EPB to generate a braking force to prevent the vehicle from moving (step S16).

EPB control means that the caliper 20 is operated to generate the braking force (the vehicle is braked and restrained) to prevent the vehicle from moving, and the EPB controller 10 controls the EPB actuator (i.e., Motor 21) to cause the piston to press the friction pad and to cause the friction pad to clamp the disc 22.

As described above, according to the parking control method of the first embodiment, by checking the driver's intention to park the vehicle from the information of the shift lever position, the starting switch information, and the wheel speed, and automatically locking the EPB, The vehicle can be restrained stably and the occurrence of an accident caused by the vehicle bouncing can be prevented.

6 is a flowchart showing a parking control process of a vehicle according to a second embodiment of the present invention. Referring to FIG. 6, there is shown a flowchart of a parking control process of a vehicle in which SBW communication failure or electrical failure EPB automatic connection procedure.

Here, the SBW communication disable means a communication disabled state between the controllers, which may indicate a communication disabled state between the SBW shift lever controller and the VCU (vehicle controller).

In case of SBW failure, the controller (VCU) can not communicate with the SBW shift lever and the shift lever position information from the SBW shift lever is not received by the controller, so that the shift lever operation state by the driver can not be recognized.

More specifically, the VCU can not operate the driveline (decelerator) parking brake even if the driver operates the shift lever in the P-stage in the CAN communication failure / disable state between the SBW shift lever controller and the VCU, or in the electric / electronic fail state.

As a result, an accident due to vehicle jamming may occur when parking on a ramp.

Therefore, in the second embodiment shown in FIG. 6, the EPB is automatically operated when the SBW shift lever is broken, and is set to perform logic when the EPB controller 10 receives the SBW failure signal from the VCU.

In the first embodiment shown in FIG. 5, the EPB controller 10 includes a step of determining the position of the shift lever P stage. However, in the second embodiment, it is determined that the SBW failure has occurred. EPB automatic contracting is made only at the time of

The rest of the procedure is the same except for the SBW failure determination step.

First, the EBP controller checks the current EPB operating state from the memory (EPB EEPROM) (S11 ').

At this time, when the EPB operating state is the brake release state, the EPB controller 10 confirms that the SBW shift lever is in a failure state from the SBW failure signal inputted from the VCU (S12 ').

The VCU, which is the highest level controller, typically performs diagnosis on the in-vehicle apparatus to determine whether or not a failure has occurred. The SBW shift lever also performs failure diagnosis such as communication failure or fail according to predetermined diagnostic logic.

Next, when the EPB controller 10 determines that the SBW shift lever is in the failure state, it determines whether the ignition switch is in the ignition-off state (S13 ').

Here, if it is determined that the ignition is off, the EPB controller 10 confirms the EPB button operation state (S14 '), and if the operation state of the EPB button 9 is the EPB brake release state, the logic ends.

On the other hand, when the EPB button 9 is not in the released state, the EPB controller 10 determines whether the vehicle is in a stop state (S15 ').

At this time, the EPB controller 10 determines that the vehicle is in a stopped state when all the wheel spindles correspond to the stop speed from the wheel-speed information of the four wheels, that is, when the wheel spindles of all the four wheels are below the stop reference speed.

Next, when the EPB controller 10 determines that the vehicle is in a stop state, it automatically engages the EPB to generate a braking force so that the vehicle does not move (S16 ').

As described above, according to the parking control method of the second embodiment, by determining whether or not the SBW is faulty and confirming the willingness to park the driver from the information such as the starting switch information and the wheel speed, the EPB is automatically concluded, So that it is possible to reliably restrain the occurrence of an accident caused by the vehicle bouncing.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And are also included in the scope of the present invention.

1: Shift lever
2: Button
4: Parking gear
5: Operation rod
6: Parking mechanism
9: EPB button
10: EPB controller
20: caliper
21: EPB actuator
22: Disc

Claims (10)

Confirming a current EPB (Electronic Parking Brake) operating state;
Confirming the shift lever position when the EPB operating state is in the braking release state;
Determining whether the vehicle is in the ignition off state (IGN OFF) when the shift lever is located at the parking position;
Determining whether the vehicle speed meets a condition of a stop state when the vehicle is in a start-off state; And
And controlling the operation of the EPB to generate a braking force for restricting the wheels when the condition of the stopped state is satisfied,
It is determined whether the operation state of the EPB button is the braking release state by the driver when the vehicle is in the start-off state. If the EPB button operation state is the braking release state, the EPB And terminating the control process without operation.
The method according to claim 1,
In the step of determining whether the engine is in the start-off state,
When the ignition switch signal is input from the ignition switch when the battery voltage is lower than the set voltage by receiving the battery voltage (IGN voltage) and the ignition switch information through the EPB wiring connected to the vehicle battery, When the vehicle is parked.
The method according to claim 1,
It is determined whether the operation state of the EPB button is the brake release state by the driver when the vehicle is in the start-off state. If the operation state of the EPB button is not the brake release state, Is satisfied. The parking control method according to claim 1,
delete The method according to claim 1,
In the step of determining whether the vehicle speed satisfies the condition of the stop state,
And when it is determined that the wheel speed of the wheel is less than a predetermined reference stopping speed, it is determined that the condition of the stopped state is satisfied.
Confirming a current EPB (Electronic Parking Brake) operating state;
Checking whether the SBW (Shift By Wire) shift lever has failed if the EPB operating state is the brake release state;
Determining whether the vehicle is in the ignition off state (IGN OFF) when the SBW shift lever is in a fault state;
Determining whether the vehicle speed meets a condition of a stop state when the vehicle is in a start-off state; And
And controlling the operation of the EPB to generate a braking force for restricting the wheels when the condition of the stopped state is satisfied,
It is determined whether the operation state of the EPB button is the braking release state by the driver when the vehicle is in the start-off state. If the EPB button operation state is the braking release state, the EPB And terminating the control process without operation.
The method of claim 6,
In the step of determining whether the engine is in the start-off state,
When the ignition switch signal is input from the ignition switch when the battery voltage is lower than the set voltage by receiving the battery voltage (IGN voltage) and the ignition switch information through the EPB wiring connected to the vehicle battery, When the vehicle is parked.
The method of claim 6,
It is determined whether the operation state of the EPB button is the brake release state by the driver when the vehicle is in the start-off state. If the operation state of the EPB button is not the brake release state, Is satisfied. The parking control method according to claim 1,
delete The method of claim 6,
In the step of determining whether the vehicle speed satisfies the condition of the stop state,
And when it is determined that the wheel speed of the wheel is less than a predetermined reference stopping speed, it is determined that the condition of the stopped state is satisfied.

Images