KR101772652B1 - Method and apparatus for indicating gear shift in manual transmission vehicle - Google Patents

Abstract

The present invention relates to an apparatus and a method for controlling a speed change in a manual shift vehicle for improving stability and driving performance in a high altitude, A storage unit configured to set a reference speed value for gear shifting for each manual gear change position according to the speed, a maximum altitude, and an atmospheric pressure value of the sea surface; A sensing unit for sensing a current atmospheric pressure outside the vehicle; And a reference speed for instructing a gear shift instruction at the set maximum altitude and sea level according to the current atmospheric pressure outside the vehicle, the present gear shift position and the current pedal position sensed by the sensing unit, atmospheric pressure at the set altitude and sea level, And a gearshift instruction control unit for generating a display control signal for the gearshift instruction according to the determined time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a shift control device for a manual shift transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission control device and a method thereof, and more particularly, to a shift control device and a method thereof in a manual transmission vehicle for improving stability and driving performance during traveling in a high altitude area.

Usually, the shifting operation of the manual transmission vehicle must be performed in an appropriate state in accordance with the load state of the engine, the vehicle speed, the engine speed, and the like.

This shift operation is not a serious problem for the driver who is skilled in driving, but it is not easy for the driver who is inexperienced to determine the load state of the engine or the vehicle speed.

In addition, even if the driver is a driver skilled in the art, there is a problem in that it is difficult to maintain the stable running state of the vehicle by failing to perform the proper shift operation when the vehicle is operated with a wrong driving habit or a manual shift vehicle other than the master car .

For this reason, a vehicle equipped with a manual transmission is equipped with a gear shift indicator (GSI: Gear Shift Indicator) that informs the driver of the shift timing.

The purpose of using the gear shift indicator will be briefly described with reference to FIG. 1 is a diagram showing contour lines for engine efficiency conversion according to engine speed and engine torque conversion.

Generally, the engine's braking fuel consumption rate (BSFC) is advantageous in terms of the fuel economy of the vehicle as it is located at the center of the contour line. Therefore, the driver's requested power may vary according to the operating conditions, but there is an equal power line depending on each power. That is, although the driver's required power is the same according to the shift pattern of the driver, the difference of the BSFC occurs. Here, the brake specific fuel consumption is, as defined in the unit time fuel consumption of the brake output, and the unit is [Nm ³ / kWh] For in the case of liquid fuel [g / kWh] or [L / kWh], the gaseous fuel . In [Nm ³ / kWh], N means Normal, that is, the reference state (1013 hPa, 0 ° C). Generally, the braking fuel consumption rate is measured by measuring the time during which a certain amount of fuel is consumed while keeping the output of the braking constant constant, calculating the fuel consumption rate per unit time, and dividing the fuel consumption rate by the axial output to obtain the braking fuel consumption rate.

Assuming a vehicle in a road condition with no external load fluctuation, when the driver makes a shift, the operating point of the engine will fluctuate on the equal power line. At this time, the same output is maintained in the vehicle before and after the shift, but there is a difference in the fuel efficiency of the engine. During the acceleration process, as shown in FIG. 1, the path of the operation region changing from the first stage to the second stage is divided into four types A, B, C, and D. In the case of A and B, the braking fuel consumption rate after shifting is worse or equal, while in case of C or D, engine efficiency improves after shifting.

Assuming the engine maximum torque under the condition of 0 m elevation as shown in Fig. 1, the maximum torque in a region with a high altitude is decreased as shown in Fig. 1 due to a decrease in air density. That is, the maximum torque is reduced because the amount of air for fuel combustion decreases due to the decrease in air density according to the atmospheric pressure.

Therefore, in the case of the operation region D, it is necessary to calculate the maximum torque available for the present engine from the atmospheric pressure and to delay the upper shift point or to maintain the present gear ratio. Especially, in the case of high torque such as backlit driving, if the upper gear shift is performed under the same conditions as the low ground, the engine stall may occur or the drivability may be deteriorated.

As a result, the conventional gear shift indicator merely adopts a shift schedule corresponding to the characteristics of the vehicle, and thus the driver can not guide the shift operation of various patterns depending on the driving situation. Thus, there is a problem in that when the manual transmission vehicle is operated, it is difficult to perform a shift operation that appropriately corresponds to the traveling state and the traveling environment of the actual vehicle.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a shift instruction control device and method for a manual shift vehicle for improving stability and driving performance during traveling in a high altitude area. .

In order to achieve the above object, according to one aspect of the present invention, there is provided a shift instruction control device for a manual shift vehicle, which includes a plurality of gears for respective manual gear shifting positions according to a current position of a vehicle pedal and a vehicle speed, A storage unit for setting a reference speed value for shifting, a maximum altitude and an atmospheric pressure value of the sea surface; A sensing unit for sensing a current atmospheric pressure outside the vehicle; And a reference speed for instructing a gear shift instruction at the set maximum altitude and sea level according to the current atmospheric pressure outside the vehicle, the present gear shift position and the current pedal position sensed by the sensing unit, atmospheric pressure at the set altitude and sea level, And a gearshift instruction control unit for generating a display control signal for instructing the gear shift according to the determined time point.

A pedal position sensing unit for sensing a position of a pedal at present and providing the pedal position to the shift control unit; A vehicle speed sensing unit for sensing the current speed of the vehicle and providing the sensed current speed to the shift instruction control unit; And a gear shifting position sensing unit for sensing a current gear shifting position of the vehicle and providing the sensed gear shifting position to the shift instructing control unit.

And a shift instruction display unit for displaying a shift point to the driver in accordance with the shift instruction control signal generated by the shift instruction control unit.

The shift instruction control unit extracts a speed value (A, B) for gear up-shift at the highest altitude and sea level according to the current pedal position value of the sensed vehicle and the current gear shift position from the storage unit A speed extractor; An atmospheric pressure extracting unit for extracting an atmospheric pressure value S of a sea level previously stored from the storage unit and an atmospheric pressure value H of a set altitude; (A, B) for gear up-shift at a maximum altitude and a sea level extracted by the speed extracting unit, an atmospheric pressure value (A, B) for a maximum altitude and a sea level extracted from the atmospheric pressure extracting unit H, S), a speed calculation unit for calculating a speed value (C) for determining a shifting timing of the vehicle by using the atmospheric pressure value (CA) outside the vehicle sensed by the atmospheric pressure sensing unit; A comparison unit comparing a speed value (C) for determining a shift instruction timing of the vehicle according to the atmospheric pressure calculated by the speed calculation unit and a current speed value (V) of the vehicle sensed by the vehicle speed sensing unit; And a signal generator for generating a control signal for controlling the shift instruction display unit in accordance with a result of comparison in the comparison unit.

The speed value (C) for determining the shift timing control calculated by the speed calculation unit is calculated using the following equation.

A is a speed value for gear up-shift at the sea level, B is a speed value for gear up-shift at a predetermined maximum altitude, S is atmospheric pressure value of a predetermined sea level (sea level) , H is the atmospheric pressure value at the set maximum altitude, and CA is the atmospheric pressure value outside the sensed vehicle.

The signal generation unit generates a control signal for driving the shift instruction display unit when the current speed of the vehicle is higher than a speed for determining the shift time calculated by the speed calculation unit as a result of the comparison by the comparison unit.

According to another aspect of the present invention, there is provided a method for controlling a shift speed in a manual shift vehicle, the method comprising: determining a maximum speed and a sea level based on a current position of the vehicle pedal and a reference speed Setting a value, a maximum altitude and an atmospheric pressure value of the sea surface in a memory; Sensing a current atmospheric pressure outside the vehicle; A reference speed for instructing a gear shift at the set maximum altitude and sea level according to the present atmospheric pressure outside the sensed vehicle, the present gear shift position and the current pedal position, the atmospheric pressure at the set altitude and sea level, To determine a gear shift instruction time point, and to generate a display control signal for the gear shift instruction according to the determined time point.

Sensing the current position of the pedal, the current speed of the vehicle and the current gearshift position of the vehicle during vehicle travel.

And displaying the shift time point to the display device according to the generated shift direction control signal.

The step of generating a display control signal for instructing a gear shift may comprise: calculating a current pedal position value of the sensed vehicle and a speed value (A, B) for gear up-shift at the highest altitude and sea level according to the current gear- Respectively, from the memory; Extracting an atmospheric pressure value (S) of a sea level predetermined in the memory and an atmospheric pressure value (H) of a maximum altitude; (A, B) for gear up-shift at the extracted maximum altitude and sea level, atmospheric pressure values (H, S) of the extracted maximum altitude and sea level, Calculating a speed value (C) for determining a shift timing of the vehicle by using an atmospheric pressure value (CA) outside the vehicle sensed by the ECU; Comparing a speed value (C) for determining a shift instruction time of the vehicle according to the calculated atmospheric pressure and a current speed value (V) of the sensed vehicle; And generating a control signal for controlling the display device according to the comparison result.

The speed value (C) for determining the calculated shift timing control is calculated using the following equation.

A is a speed value for gear up-shift at the sea level, B is a speed value for gear up-shift at a predetermined maximum altitude, S is atmospheric pressure value of a predetermined sea level (sea level) , H is the atmospheric pressure value at the set maximum altitude, and CA is the atmospheric pressure value outside the sensed vehicle.

The generating of the signal generates a control signal for driving the display device when the current speed of the vehicle is higher than the speed (C) for determining the calculated shift time as a result of the comparison.

According to the present invention, when the shifting time point is determined by reflecting the maximum torque according to the atmospheric pressure drop of the manual shift transmission in the high altitude range, the engine stall according to the shift indicator, that is, It has the effect of preventing problems.

Further, according to the present invention, in the case of the shift indicator without the conventional atmospheric pressure correction, it is necessary to conservatively calibrate the shift point in consideration of the torque decrease of the high altitude at the shift point of the low point. However, So that it is possible to improve fuel economy by preventing an unnecessary shift delay at a shift point in a low-lying situation.

1 is a diagram showing contour lines for engine efficiency conversion according to a general engine speed and an engine torque conversion.
2 is a block diagram of a shift instruction control device in a manual transmission vehicle according to the present invention.
Fig. 3 is a graph showing the gear shift timing determination threshold for each pedal position and vehicle speed according to the altitude (atmospheric pressure) stored in the storage unit of Fig.
4 is a detailed block diagram of the speed change instruction control unit shown in Fig.
5 is a flowchart showing an operation flow of a shift instruction control method in a manual transmission vehicle according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and features of the present invention and methods of achieving them will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, And advantages of the present invention are defined by the description of the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, operation, and / Or added.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and a method for controlling a manual transmission according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a block diagram of a shift control device in a manual transmission according to the present invention. FIG. 3 is a block diagram showing the structure of the shift control device according to the present invention. A graph showing a crystal threshold (threshold).

1, the shift instruction control device in the manual transmission vehicle includes a pedal position sensing portion 10, a shift position sensing portion 20, a vehicle speed sensing portion 30, an atmospheric pressure sensing portion 40, A control unit 50, a storage unit 60, and a shift instruction display unit 70. [

The pedal position sensing unit 10 senses the current position of the pedal during travel of the manual transmission and provides the sensed current pedal position value to the controller 50. [

The shift position sensing unit 20 senses the shift position of the currently shifted gear while the manual transmission is in motion and provides the sensed gear shift position value to the control unit 50. [

The vehicle speed sensing unit 30 senses the speed of the current vehicle and provides the sensed vehicle speed value to the controller 50. [

The atmospheric pressure sensing unit 40 senses the atmospheric pressure outside the vehicle and provides the control unit 50 with the atmospheric pressure value of the currently sensed road. Here, the altitude of the road under driving can be determined according to the measured atmospheric pressure.

As shown in FIG. 3, the storage unit 60 stores pedal position and gear shift threshold value for each vehicle speed according to altitude (atmospheric pressure). That is, as shown in FIG. 3, the upshift threshold value according to the current position of the vehicle pedal at the highest altitude, the current vehicle speed at the corresponding pedal position, and the value of the vehicle pedal at the sea level Up shift threshold values according to the vehicle's current speed at the current position and the corresponding pedal position can be stored in different map forms. Here, the maximum altitude is an altitude at which the engine torque is reduced to the maximum according to the atmospheric pressure when the vehicle is running. That is, the altitude at which the engine torque is not reduced and the altitude at which the engine torque is reduced to the maximum can be separately set.

The storage unit 60 may store an atmospheric pressure value S of a sea level and an atmospheric pressure value H at a set altitude.

The transmission instruction control unit 70 receives the current pedal position value, the shift position value, the current gear position value, the present atmospheric pressure value CA outside the vehicle, the current speed value V of the vehicle, (Speed) value A at a sea level position stored in the storage unit 60 according to the present invention, a speed change value B at a maximum altitude set in the storage unit, (C) for determining the shift timing of the vehicle by using the atmospheric pressure value (S) at the maximum altitude at which the vehicle is at sea level (S) and the atmospheric pressure value (H) at the maximum altitude stored in the storage section (60)

The transmission instruction control unit 70 compares the calculated speed value C with the current speed value V of the vehicle sensed by the vehicle speed sensing unit 30, .

The shift instruction display unit 70 may be a display device capable of displaying an LED lamp or a gear shift character so that the driver can confirm the shift timing under the control of the shift instruction control unit 70. [

The specific configuration and operation of the shift command controller 70, which is a core technical feature of the present invention, will be described in detail with reference to FIG.

FIG. 4 is a block diagram showing a detailed block configuration of the shift command controller 70 shown in FIG.

4, the speed change instruction control unit 70 includes first and second speed extracting units 51 and 52, an atmospheric pressure extracting unit 53, a speed calculating unit 54, a comparing unit 55, (56).

The first speed calculating unit 51 calculates the speed of the vehicle based on the current pedal position value of the vehicle sensed by the pedal position sensing unit 10 and the current speed position detected by the speed change position sensing unit 20 Shift rate threshold value A for gear up-shift at sea level is extracted from the up-shift threshold value as shown in FIG. 3 stored in the storage unit 60, and is provided to the speed calculation unit 54. FIG.

The second speed calculating unit 52 calculates the second speed based on the current pedal position value of the vehicle sensed by the pedal position sensing unit 10 and the current pedal position of the vehicle at the highest altitude And extracts the speed value B for gear up-shift from the up-shift threshold value as shown in FIG. 3 stored in the storage unit 60 and provides the speed value B to the speed calculation unit 54.

The atmospheric pressure extractor 53 extracts the atmospheric pressure value S of the sea level and the atmospheric pressure value H at the highest altitude set from the storage unit 60 and outputs the atmospheric pressure value H to the speed calculator 54, .

The speed calculator 54 calculates a speed value A for gear up-shift at the sea level provided by the first speed extractor 51, A velocity value B for gear up-shift at an altitude, an atmospheric pressure value S of a sea level provided from the atmospheric pressure extracting section 53 and a maximum altitude value S extracted from the atmospheric pressure extracting section 53, A speed value C for determining the shift timing of the vehicle is calculated using the atmospheric pressure value H at the set position and the atmospheric pressure value CA outside the vehicle sensed by the atmospheric pressure sensing unit 40 shown in Fig. And provides it to the comparison unit 55.

That is, the calculation of the speed value C for determining the shift timing can be calculated using the following equation (1).

Here, A is a speed value for gear up-shift at the sea level, B is a speed value for gear up-shift at the maximum altitude, S is atmospheric pressure value of the sea level, H is set The atmospheric pressure value at the highest altitude, CA, is the atmospheric pressure value outside the sensed vehicle.

The comparison unit 55 compares the speed value C for determining the shift instruction timing of the vehicle according to the atmospheric pressure calculated by the speed calculation unit 54 and the vehicle speed detected by the vehicle speed sensing unit 30 shown in FIG. And provides the comparison result information to the signal generating unit 56. The signal generating unit 56 generates the comparison result information.

The signal generation unit 56 controls the shift instruction display unit 70 shown in FIG. 1 according to a comparison result value provided from the comparison unit 55. That is, when the current speed value V of the vehicle is larger than the speed value C calculated by the speed calculating unit 54 as a result of the comparison by the comparison unit 70, It is determined that this is not the shift instruction timing, and the up-shift instruction is delayed.

However, when the current speed value V of the vehicle is smaller than the speed value C calculated by the speed calculating unit 54, the signal generating unit 56 determines that the shift is desired to be performed at the present time And generates a control signal for controlling the shift instruction display unit 70 shown in Fig.

Therefore, the shift instruction display unit 70 displays the shift time point according to the control signal provided from the signal generation unit 56, so that the driver can easily determine the shift time point.

A method of controlling the speed change instruction in the manual transmission according to the present invention, which corresponds to the operation of the speed change instruction device in the manual shift vehicle according to the present invention, will be described step by step with reference to FIG.

5 is a flowchart illustrating a shift control method for a manual transmission according to the present invention.

As shown in FIG. 5, the pedal position and the gear shift threshold value for each vehicle speed are stored according to the altitude (atmospheric pressure). That is, as shown in FIG. 3, the upshift threshold value according to the current position of the vehicle pedal at the highest altitude, the current vehicle speed at the corresponding pedal position, and the value of the vehicle pedal at the sea level Upshift threshold values according to the current speed of the vehicle at the current position and the corresponding pedal position are stored in different maps. Here, the maximum altitude is an altitude at which the engine torque is reduced to the maximum according to the atmospheric pressure when the vehicle is traveling. That is, the altitude at which the engine torque is not reduced and the altitude at which the engine torque is reduced to the maximum are separately set in the memory. The atmospheric pressure value S at the sea level and the atmospheric pressure value H at the set altitude are set in the memory at step S501.

The current gear shift position value, the current pedal position value, the current vehicle speed V and the external atmospheric pressure of the current vehicle are detected at step S502, respectively.

(A, B), maximum altitude and sea level (H, S) corresponding to the maximum altitude and the sea level gear change timing according to the sensed current gear shift position value and the pedal position value at step S501 From the value set in the memory (S503).

Next, a speed value A for gear up-shift at the extracted sea level, a speed value B for gear up-shift at the maximum altitude, an atmospheric pressure value S), an atmospheric pressure value H at a set maximum altitude position, and an atmospheric pressure value CA outside the vehicle, to calculate a speed value C for determining the shifting timing of the vehicle. That is, the speed value C for determining the shifting time is calculated by using Equation 1 (S504).

Next, a speed value (C) for determining the shifting instruction time of the vehicle is compared with a current speed value (V) of the vehicle sensed in step S502, and a speed value (C) is greater than a current speed value (V) of the vehicle sensed in step S502 (S505).

As a result of the determination, if the current speed value V of the vehicle is greater than the speed value C calculated in step S504, it is determined that the present time is not the shift instruction time and the up-shift instruction is delayed. If the current speed value V of the vehicle is smaller than the speed value C calculated in step S504, it is determined that it is desirable to perform the shifting at the present time and a control signal for the shift instruction is generated in step S506.

Accordingly, the display device (LAMP) is driven in accordance with the control signal for the generated shift instruction so that the driver can confirm that the current time is the shift time (S507).

Although the present invention has been described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be understood that the scope of the present invention is not limited to the specific embodiments, And various alternatives, modifications, and alterations can be made within a range.

Therefore, the embodiments described in the present invention and the accompanying drawings are intended to illustrate rather than limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and accompanying drawings . The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

10: Pedal position sensing unit 20: Shift position sensing unit
30: vehicle speed sensing unit 40: atmospheric pressure sensing unit
50: shift command controller 51: first speed extractor
52: second speed extracting section 53: atmospheric pressure extracting section
54: speed calculating section 55: comparing section
56: signal generator 60:
70:

Claims (12)

A storage unit for setting a reference speed value for gear shifting for each manual gear shifting position, a maximum altitude and an atmospheric pressure value of sea level according to the current position of the vehicle pedal and the vehicle speed by dividing the altitude and sea level;
A sensing unit for sensing atmospheric pressure outside the vehicle;
A speed extracting unit for extracting speed values (A, B) for gear up-shift at the highest altitude and sea level according to the current pedal position value of the vehicle and the current gear shift position from the storage unit, An atmospheric pressure extracting unit for extracting an atmospheric pressure value S of a stored sea level and an atmospheric pressure value H of a set maximum altitude, (H, S) of the maximum altitude and sea level extracted from the atmospheric pressure extracting unit, the atmospheric pressure value (CA) outside the vehicle sensed by the sensing unit, A speed calculating section for calculating a speed value C for deciding a shifting timing of the vehicle by using a speed value calculated by the speed calculating section and a speed value C for determining a shifting instruction timing of the vehicle in accordance with the atmospheric pressure calculated by the speed calculating section, The current And a signal generation section for generating a control signal for controlling the shift instruction display section in accordance with the comparison result in the comparison section, Control device.
The method according to claim 1,
A pedal position sensing unit for sensing a position of a pedal at present and providing the pedal position to the shift control unit;
A vehicle speed sensing unit for sensing the current speed of the vehicle and providing the sensed current speed to the shift instruction control unit; And
And a gear shifting position sensing unit for sensing a current gear shift position of the vehicle and providing the sensed gear shift position to the shift instruction control unit.
3. The method of claim 2,
Further comprising a shift instruction display section for displaying a shift point to the driver in accordance with the shift instruction control signal generated by the shift instruction control section.
delete The method according to claim 1,
And the speed value (C) for determining the shifting timing control calculated by the speed calculating section is calculated using the following equation.

A is a speed value for gear up-shift at the sea level, B is a speed value for gear up-shift at a predetermined maximum altitude, S is atmospheric pressure value of a predetermined sea level (sea level) , H is the atmospheric pressure value at the set maximum altitude, and CA is the atmospheric pressure value outside the sensed vehicle.
The method according to claim 1,
Wherein the signal generator comprises:
Wherein the control unit generates a control signal for driving the shift instruction display unit when the current speed of the vehicle is greater than the speed for determining the shift time calculated by the speed calculation unit as a result of the comparison by the comparison unit A shift instruction control device.
Setting a reference speed value, a maximum altitude, and an atmospheric pressure value of a sea level in each of the manual gearshift positions according to the current position of the vehicle pedal and the vehicle speed by dividing a maximum altitude and a sea level;
Sensing a current pedal position, a current speed of the vehicle, a current gearshift position of the vehicle, and a current atmospheric pressure outside the vehicle during driving the vehicle;
Extracting, from the memory, a speed value (A, B) for gear up-shift at the highest altitude and sea level according to the current pedal position value of the vehicle and the current gear shift position;
Extracting an atmospheric pressure value (S) of a sea level predetermined in the memory and an atmospheric pressure value (H) of a maximum altitude;
(A, B) for gear up-shift at the extracted maximum altitude and sea level, atmospheric pressure values (H, S) of the extracted maximum altitude and sea level, Calculating a speed value (C) for determining a shift timing of the vehicle using an atmospheric pressure value (CA) outside the vehicle;
Comparing a speed value (C) for determining a shift instruction time of the vehicle according to the calculated atmospheric pressure and a current speed value (V) of the sensed vehicle; And
And generating a display control signal for instructing a gear shift according to the comparison result.
delete 8. The method of claim 7,
Further comprising the step of displaying to the display device a shift time point to the driver in accordance with the generated shift direction control signal.
delete 8. The method of claim 7,
And the speed value (C) for determining the calculated shift timing control is calculated using the following equation.

A is a speed value for gear up-shift at the sea level, B is a speed value for gear up-shift at a predetermined maximum altitude, S is atmospheric pressure value of a predetermined sea level (sea level) , H is the set maximum
The atmospheric pressure value at altitude, CA, is the atmospheric pressure value outside the perceived vehicle.
8. The method of claim 7,
The step of generating the display control signal includes:
Wherein the display control signal is generated when the current speed of the vehicle is greater than the speed (C) for determining the calculated shifting time as a result of the comparison.

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