KR102153326B1 - Shift control method for advance cruise control of vehicles - Google Patents

Abstract

The present invention relates to a method of performing the shift control during advance cruise driving of a vehicle. The method includes: a step in which if gear shifting is performed during the operation of advance cruise control (ACC), a control part checks whether a virtual accelerator pedal (APS) value is no more than a designated setting value (A) and an engine torque value is no less than a designated setting value (B); a step in which if the virtual APS value is no more than the designated setting value (A) and the engine torque value is no less than the designated setting value (B), the control part whether an RPM difference (ΔRPM) value between turbine RPM and sync RPM of a current step is no less than a designated setting value (C); and a step in which if the RPM difference (ΔRPM) value is no less than the designated setting value (C), the control part performs forced power-on gear shifting in accordance with designated protection logic. Therefore, the method is capable of performing gear shifting without causing physical damage to a transmission.

Description

Shift control method when driving a vehicle's advanced cruise {SHIFT CONTROL METHOD FOR ADVANCE CRUISE CONTROL OF VEHICLES}

The present invention relates to a shift control method during an advance cruise driving of a vehicle, and more particularly, when a virtual APS (Accelerator Padal) value is not transmitted from an engine controller (ECU) during an ACC (Advanced Cruise Control) operation of a vehicle, The present invention relates to a method for controlling a shift during advanced cruise driving of a vehicle, which enables shifting while preventing physical damage from occurring.

In general, it is called CC (Cruise Control), which operates while maintaining the speed specified by the driver, and the development of this is called ACC (Advance Cruise Control).

This ACC has a function that automatically decelerates when there is an obstacle in front of the vehicle, and it automatically increases to the target vehicle speed even when the vehicle is stopped and operated.

At this time, since the driver has not stepped on the APS (Accelerator Pedal), the automatic transmission receives the virtual APS value from the engine controller (ECU) and proceeds to shift.

However, if the virtual APS value is not transmitted from the engine controller (ECU) during ACC operation, that is, it is determined that the virtual accelerator pedal is not input, the power on shift is changed to the power off shift. A problem of misjudgement may occur, and when a shift is made by misjudgement of the shift situation, physical damage to the transmission may occur.

For reference, the power-on shift refers to an upshift shift in the direction of maintaining or increasing the vehicle speed, where the engine torque is positive (+), and the power-off shift means the engine torque is negative (-) and the vehicle speed is reduced. It means a downshift shift in the direction.

The background technology of the present invention is disclosed in Korean Patent Registration No. 10-1382240 (registered on April 1, 2014, a method for controlling a shift during auto cruise driving of a vehicle).

According to an aspect of the present invention, the present invention was created to solve the above problems, and the virtual APS (Accelerator Padal) value is not transmitted from the engine controller (ECU) during the operation of the vehicle ACC (Advance Cruise Control). In this case, it is an object of the present invention to provide a shift control method during an advanced cruise driving of a vehicle, which enables the shifting to be performed while preventing physical damage to the transmission.

According to an aspect of the present invention, a method for controlling a shift during an advance cruise driving of a vehicle is, when a speed change is performed during an Advance Cruise Control (ACC) operation, the controller has a virtual APS (Accelerator Padal) value equal to or less than a specified set value (A) and the engine torque Checking whether the value is equal to or greater than the specified set value (B); When the virtual APS value is less than or equal to the specified set value (A) and the engine torque value is greater than or equal to the specified set value (B), the control unit sets the rotation speed difference (ΔRPM) between the turbine RPM and the synchronous RPM of the current stage equal to or greater than the specified set value (C). Checking whether or not; And performing, by the control unit, a forced power-on shift according to a designated protection logic when the rotation speed difference (ΔRPM) is equal to or greater than a specified set value (C).

In the present invention, when the virtual APS value is equal to or less than the specified set value (A) and the engine torque value is equal to or greater than the specified set value (B), the control unit sets the release pressure of the current gear stage from the highest pressure to the first intermediate pressure specified. Conversely, the fastening pressure of the next rising gear is vertically increased from the lowest pressure to the designated second intermediate pressure, but the release pressure and the fastening pressure are the highest pressure> first intermediate pressure> second intermediate pressure> lowest pressure. It features.

In the present invention, the control unit gradually lowers the release pressure vertically lowered to the designated first intermediate pressure to the lowest pressure according to a designated slope, and the fastening pressure vertically raised to the designated second intermediate pressure is currently second intermediate The pressure is temporarily maintained for a specified period of time and then vertically lowered to a specified third intermediate pressure between the current second intermediate pressure and the lowest pressure, but the release pressure and the fastening pressure are the highest pressure> first intermediate pressure> second. It is characterized in that the 2 medium pressure> the third medium pressure> the lowest pressure.

In the present invention, in order to perform a forced power-on shift according to a designated protection logic, the control unit vertically descends to a designated third intermediate pressure between the second intermediate pressure and the lowest pressure and maintains the fastening pressure up to the maximum pressure. It is characterized in that the forced power-on shift is performed by vertically raising.

In the present invention, the control unit is characterized in that, according to the designated protection logic, the control unit maintains the shifted shift stage until the ACC (Advance Cruise Control) operation is turned off.

According to an aspect of the present invention, the present invention provides a shift while preventing physical damage to the transmission when a virtual APS (Accelerator Padal) value is not transmitted from the engine controller (ECU) during the operation of the advance cruise control (ACC) of the vehicle. To be able to perform.

1 is an exemplary view showing a schematic configuration of a shift control apparatus when driving an advanced cruise of a vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a method of controlling a shift during an advanced cruise driving of a vehicle according to an embodiment of the present invention.
FIG. 3 is an exemplary view shown in FIG. 2 to explain a change in tightening pressure during operation of the protection logic.

Hereinafter, an embodiment of a method for controlling a shift during an advanced cruise driving of a 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 and 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 showing a schematic configuration of a shift control apparatus when driving an advanced cruise of a vehicle according to an embodiment of the present invention.

As shown in FIG. 1, the shift control device for the advance cruise driving of the vehicle according to the present embodiment includes a vehicle speed input unit 110, an engine information input unit 120, a turbine information input unit 130, a virtual APS input unit 140, It includes a control unit 200 and a transmission 300.

The vehicle speed input unit 110 detects and receives the vehicle speed of the vehicle.

The engine information input unit 120 detects and receives engine-related information (eg, engine RPM, engine torque, etc.).

The turbine information input unit 130 detects and receives the rotational speed (turbine RPM) of the turbine.

The virtual accelerator padal (APS) input unit 140 receives a virtual accelerator padal (APS) value (ie, a virtual opening degree) from an engine controller (ECU) (not shown).

The control unit 200 performs a shift during an Advance Cruise Control (ACC) operation based on information received through the plurality of input units 110 to 140.

However, as already described above, if the virtual APS value is not received from the engine controller (ECU) during ACC operation (ie, virtual APS = 0%), it is determined that the virtual accelerator pedal is not input, and the power is turned on. A problem of misjudgement of the (Power On) shift as a power off shift may occur, and physical damage to the transmission 300 may occur when a shift is made by erroneously determining the shift situation as described above.

Therefore, in this embodiment, the controller 200 is based on a virtual APS value, an engine torque value, and a rotation speed difference (ΔRPM = turbine RPM-synchronous RPM), when a predetermined condition is met (that is, the virtual APS value is Set value (A) or less & engine torque value is set value (B) or more & ΔRPM is set value (C) or more) (see Fig. 2), forced shifting is performed through forced hydraulic control by pre-designated protection logic (see Fig. 3). After performing, the shifted shift stage is maintained until ACC operation is turned off.

Accordingly, the present embodiment prevents physical damage to the transmission 300 even when shifting is performed while the virtual APS value is not received during ACC operation.

FIG. 2 is a flow chart for explaining a shift control method when driving an advanced cruise of a vehicle according to an embodiment of the present invention, and FIG. 3 is an exemplary view shown to explain a change in tightening pressure during operation of the protection logic in FIG. 2. .

Referring to FIG. 2, when the control unit 200 performs a shift during the ACC (Advance Cruise Control) operation (example of S101), the virtual APS value (that is, the virtual opening degree value) is less than or equal to the specified set value A (S102 Example) It is checked whether the engine torque value is equal to or greater than the specified set value (B) (example in S103) (point ⑤ in Fig. 3).

When the point ⑤ of FIG. 3 (that is, the virtual APS value (that is, the virtual opening value) is less than or equal to the specified set value (A) & the engine torque value is equal to or greater than the specified set value (B)), the control unit 200 currently shifts The release pressure (③) of the stage is vertically lowered from the highest pressure to the designated first intermediate pressure, and on the contrary, the fastening pressure (④) of the next rising gear is vertically raised from the lowest pressure to the designated second intermediate pressure.

Thereafter, the control unit 200 gradually lowers the release pressure (③) vertically lowered to the designated first intermediate pressure to the lowest pressure according to the designated slope, and the fastening pressure (④) vertically raised to the designated second intermediate pressure is The current second intermediate pressure is temporarily maintained for a specified time, and then vertically lowered to a specified third intermediate pressure between the current second intermediate pressure and the lowest pressure.

For reference, it is the highest pressure> the first intermediate pressure> the second intermediate pressure> the third intermediate pressure> the lowest pressure.

And when the rotational speed difference (ΔRPM = turbine RPM-synchronous RPM) exceeds the specified set value (C) (example of S104) (at point ⑥ in Fig. 3), the control unit 200 controls the Forced power-on shifting is performed by vertically increasing the fastening pressure (④), which was maintained by vertically lowering to the specified third intermediate pressure between the second intermediate pressure and the lowest pressure, to the maximum pressure.

In addition, the control unit 200 maintains the shifted shift stage until ACC operation is turned off according to the designated protection logic.

As described above, in this embodiment, when shifting is performed during the ACC (Advance Cruise Control) operation. By forcibly performing a shift within a short time (for example, 4 seconds prior to the present invention, 0.5 seconds of the present invention) by controlling the "fastening pressure when the protection logic is operated" compared to the "fastening pressure when the protection logic is not operated" indicated by the dotted line in FIG. The turbine RPM (②), which was rising after following the RPM (①), descends, so that it operates stably without causing physical damage to the transmission 300.

As described above, in this embodiment, when the virtual APS (Accelerator Padal) value is not transmitted from the engine controller (ECU) during the operation of the vehicle's ACC (Advance Cruise Control), the shift can be performed while preventing physical damage to the transmission. There is an effect to make.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. 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: vehicle speed input unit
120: engine information input unit
130: turbine information input unit
140: virtual APS input unit
200: control unit
300: transmission

Claims (5)

Checking, by the control unit, whether a virtual accelerator padal (APS) value is less than or equal to a specified set value (A) and an engine torque value is greater than or equal to a specified set value (B) when shifting is performed during an Advance Cruise Control (ACC) operation;
When the virtual APS value is less than or equal to the specified set value (A) and the engine torque value is greater than or equal to the specified set value (B), the control unit sets the rotation speed difference (ΔRPM) between the turbine RPM and the synchronous RPM of the current stage equal to or greater than the specified set value (C). Checking whether or not; And
When the rotational speed difference (ΔRPM) value is greater than or equal to a specified set value (C), performing, by the control unit, a forced power-on shift according to a designated protection logic; and a shift control method during an advanced cruise driving of a vehicle, comprising: .
The method of claim 1,
When the virtual APS value is below the specified set value (A) and the engine torque value is above the specified set value (B),
The control unit,
The release pressure of the current gearbox is vertically lowered from the highest pressure to the specified first intermediate pressure, and on the contrary, the fastening pressure of the next rising gear is vertically raised from the lowest pressure to the designated second intermediate pressure,
The release pressure and fastening pressure are,
Highest pressure> first intermediate pressure> second intermediate pressure> minimum pressure, characterized in that the vehicle shift control method for advanced cruise driving.
The method of claim 2, wherein the control unit,
The release pressure vertically lowered to the designated first intermediate pressure is gradually lowered to the lowest pressure according to the designated slope,
The fastening pressure vertically raised to the designated second intermediate pressure is maintained by temporarily maintaining the current second intermediate pressure for a specified time and then vertically lowering to a designated third intermediate pressure between the current second intermediate pressure and the lowest pressure,
The release pressure and fastening pressure are,
Highest pressure> first intermediate pressure> second intermediate pressure> third intermediate pressure> minimum pressure, the vehicle shift control method for advanced cruise driving, characterized in that.
The method of claim 3, wherein the control unit,
In order to perform a forced power-on shift according to the specified protection logic,
A method for controlling a speed change when driving an advanced cruise of a vehicle, characterized in that for performing a forced power-on shift by vertically increasing the fastening pressure maintained by vertically lowering to a designated third intermediate pressure between the second intermediate pressure and the lowest pressure to a maximum pressure.
The method of claim 4, wherein the control unit,
According to the designated protection logic, the shift control method during advanced cruise driving of a vehicle, characterized in that maintaining the corresponding shift stage until ACC (Advance Cruise Control) operation is turned off.

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