KR20190065690A - Coasting system control device and method of Mild hybrid vehicle - Google Patents

Abstract

Disclosed are a device and a method for coasting system control of a mild hybrid vehicle which allow a motor generator to assist in engine output. According to an aspect of the present invention, the device for coasting control comprises: a motor generator installed to exchange power with an output shaft of an engine; an electronic control clutch to connect and regulate power between the engine and a transmission; and an electronic control unit (ECU) to control on/off of the engine, the electronic control clutch, and the motor generator based on information collected from sensors of vehicle components. The electronic control unit determines power demand of a vehicle corresponding to an operation amount of an accelerating pedal and connects the electronic control clutch if the accelerating pedal is operated while coasting allowing the vehicle to move by driving inertia only, and controls the vehicle to be driven only by output of the motor generator in an engine off state if the determined power demand is within a previously inputted set range to improve fuel efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a coasting system control device and method,

The present invention relates to an apparatus and a method for controlling a running system of a mild hybrid vehicle in which an engine output is assisted by an engine output. More particularly, the present invention relates to an apparatus and method for controlling a running system of a mild hybrid vehicle, The present invention relates to an apparatus and a method for controlling a running system of a mild hybrid vehicle.

Coasting refers to the movement of the vehicle with only the inertia of the vehicle without the assistance of the engine at a certain speed or higher after the vehicle acceleration. In the recent trend of growing interest in fuel economy, the development of vehicles that effectively utilize the costing that can move the maximum mileage with minimal fuel is now a major concern of the automotive industry.

Coasting gradually decelerates the vehicle using the traveling energy without the driver's acceleration. Therefore, the output of the engine is controlled by a motor-generator in a mild hybrid vehicle Costing is advantageous because the engine can be turned ON / OFF quickly through a high output motor generator.

Generally, in most hybrid vehicles, when the predetermined condition (for example, when the vehicle speed is equal to or higher than a predetermined speed and the accelerator pedal is not operated) is satisfied, the controller determines that the clutch is released and releases the clutch that interrupts the power transmission between the engine and the transmission Release), while the engine is off to prevent unnecessary fuel injection, thereby increasing mileage and improving fuel economy.

Particularly, in order to maximize fuel economy improvement, when the current state of the vehicle satisfies the costing condition and enters the costing mode, the engine fuel cut and the engine cylinder It is set to take a method of entering stop. However, this method may cause the following problems in some cases.

First, when the driver depresses the accelerator pedal during the course of the driving, the engine must be turned on again in order to reflect the driver's acceleration. In this case, since the driver's acceleration will not be reflected during the engine restarting time, There is no choice but to be. Acceleration delay may occur during re-acceleration due to the driver's remorse during the course.

Second, when the accelerator pedal is depressed for restraining during the course, the engine output must be raised to a level at which the torque corresponding to the required power can be exhibited in a short period of time. Therefore, there is a problem that the exhaust gas is adversely affected. In order to cope with the remorse of the engine, it is necessary to repeat the engine on / off.

Korean Patent No. 10-1646369 (published on Aug. 2016)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an exhaust emission control apparatus and a control method thereof that, when an accelerator pedal is depressed during a coasting And an object of the present invention is to provide an apparatus and a method for controlling a costing system of a mild hybrid vehicle that can solve the problem of adverse effects.

According to an aspect of the present invention,

1. A mild hybrid system in which an engine output is assisted by a motor generator,

A motor generator installed to receive power from the engine output shaft;

An electronic control clutch that interrupts power connection between the engine and the transmission;

And an electronic control unit (ECU) for controlling the motor generator, the electronic control clutch, and the engine on / off based on the information collected from the sensors of each part of the vehicle,

The electronic control unit collects information necessary for grasping whether or not a condition for entering a coasting condition is satisfied from the sensors, and when the state of the current vehicle recognized from the collected information satisfies a condition for entering a coasting condition, Releasing the electronic control clutch and turning off the engine so as to switch the vehicle to a running mode (driving mode) so that the vehicle can be moved only by the inertial force of the vehicle,

When the accelerator pedal is operated during running in the running mode, the power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal is determined and the electronic control clutch is connected. If the determined required power value is within the predetermined input range Threshold , The control unit controls the vehicle to be driven only by the output of the motor generator in the engine off state.

The information required to determine whether or not the coasting entry condition is satisfied may include some or all of the position values of the accelerator pedal and the brake pedal, the current speed of the vehicle, and the gear engagement state information of the transmission.

The coasting entry condition includes a case where the position value of the accelerator pedal and the brake pedal is '0' in a state where the current vehicle speed is equal to or higher than a predetermined speed, and further, And a state in which it is engaged with the gear.

The electronic control unit applied to one aspect of the present invention is characterized in that when the required power value determined in accordance with the accelerator pedal operation of the driver during driving in the costing mode exceeds the set range, And starts the engine drive (On) from a time point exceeding the set range, thereby controlling the vehicle to be driven to the engine.

Preferably, the electronic control unit includes an information collecting unit for collecting information necessary for grasping whether or not the condition for entering the coasting is satisfied, a state of the current vehicle recognized from the information collected through the information collecting unit, A determination unit for determining whether a coasting entry condition is satisfied, a determination unit for determining whether a casting mode release request is issued while the vehicle is traveling in a casting mode, a mode switching unit for switching to the costing mode And a signal output unit for outputting a control signal for canceling the costing mode.

The signal output unit sends a Release signal to the electronic control clutch and sends an Off signal to the engine when the state of the current vehicle satisfies the condition for entering the coasting as a result of the determination by the determination unit, And outputs a signal for engaging the electronically controlled clutch when there is a request for canceling the coining mode from the determination unit according to the operation of the accelerator pedal during running in the costing mode, It can be set to output an output signal only to the motor generator according to the amount of operation of the accelerator pedal or to output a signal for driving the engine when an output signal is sent to the motor generator and reaches a predetermined output.

According to another aspect of the present invention as a solution to the problem,

1. A mild hybrid system in which an engine output is assisted by a motor generator,

An information gathering step of collecting information necessary for grasping the condition of entering the coasting;

A costing entry judgment step of judging whether the state of the current vehicle recognized from the information collected in the information collection step satisfies a condition for entry into a coasting;

A costing mode entering step of switching to a costing mode (batting driving mode) so that the vehicle can be moved only by the driving inertia if the current state of the vehicle satisfies the costing entry condition as a result of the judgment of the entering step of the costing;

Determining whether or not there is a request for canceling a running mode while the vehicle is running in a running mode;

A cancellation releasing step of connecting the electronically controlled clutch and determining a power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal when there is a request to cancel the cancellation as a result of the cancellation;

And a driving control step of controlling at least one of the motor generator and the engine according to the required power value determined in the step of canceling the costing so as to satisfy the required power.

Herein, the information necessary for grasping whether or not the coasting entry condition is satisfied in the information collection step includes at least part of the position value of the accelerator pedal and the brake pedal, the current speed of the vehicle, and the gear engagement state information of the transmission .

The coasting entry condition includes a case where the position value of the accelerator pedal and the brake pedal is '0' in a state where the current vehicle speed is equal to or higher than a predetermined speed, and further, And a state in which it is engaged with the gear.

In the step of entering the costing mode, the electronic control clutch for interrupting the power connection between the engine and the transmission is released, and the engine is turned off, so that the vehicle is driven only in the traveling inertia mode Can be switched.

According to another aspect of the present invention, when the accelerator pedal operation signal is inputted during the running in the costing mode, it can be determined that there is a request to release the costing mode.

In addition, in the drive control step, when the engine is in the engine-off state, the vehicle is driven only by the output of the motor generator when the engine is in the preset range (Threshold) previously set according to the required power value determined in the costing- A control is performed to start the engine from the time when the vehicle exceeds the set range and to drive the vehicle with the motor generator only from the point where the set range is exceeded so that the vehicle is driven to the engine.

According to the apparatus and method for controlling the costing system of the mild hybrid vehicle according to the present invention, when the accelerator pedal is operated by the driver's remorse during the coasting, the accelerator pedal is operated in response to the re- It is possible to improve the fuel consumption loss caused by repeating turning the engine on and off and the conventional problem of adversely affecting the exhaust gas.

That is, when the output demand value of the driver is less than a predetermined value when the accelerator pedal is depressed during the costing (driving) of the mild hybrid vehicle in which the engine output is assisted by the motor generator, It is possible to reduce fuel consumption section and emission occurrence to solve fuel consumption improvement and exhaust gas problem, and also to solve the acceleration delay problem.

In addition, in the prior art, vibration has occurred in the re-acceleration state because the engine output has to be raised in a short time during the re-acceleration. However, according to the present invention, until the preset threshold value And then only the output section corresponds to the engine output, thereby minimizing the occurrence of vibration due to the abrupt increase in output in the re-acceleration state.

1 is a conceptual diagram of an apparatus for controlling a casting system of a mild hybrid vehicle according to an aspect of the present invention.
2 is a flow chart comprising a specific control algorithm for controlling the casting system;
Fig. 3 is a view showing the state of the vehicle at the time of all entering or leaving the costing, and the speed change according to the distance in the state.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In describing the present invention, the terminology used in the following description is used only to describe a specific embodiment and is not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

It is also to be understood that the terms such as " comprises "or" having "in this specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software .

In the following description with reference to the accompanying drawings, the same reference numerals will be given to the same constituent elements, and redundant description of the same constituent elements will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention relates to a conventional problem in which when the accelerator pedal is operated by a driver's remorse during coasting, the fuel consumption loss and the exhaust performance adversely affecting the recalculation requirement due to the operation of the accelerator pedal are adversely affected If the output demand of the driver is less than a predetermined value, it is possible to cope with the output request only by the output of the motor generator in the engine off state.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, preferred embodiments of the present invention will be described in detail.

1 is a conceptual diagram of an apparatus for controlling a costing system of a mild hybrid vehicle according to an aspect of the present invention.

Referring to Fig. 1, the costing system control device includes a motor generator 20. [ The motor generator 20 is installed to be able to receive power from the output shaft of the engine 10 and assists the output of the engine 10 from the electricity of the high voltage battery 25 at a constant speed or below. And provides the high voltage battery 25 with electricity.

The costing system control device of the mild hybrid vehicle also includes an electronic control clutch 30. [ The power output from the engine 10 is provided to the transmission 40 via the electronic control clutch 30 and is transmitted to the wheels after being appropriately shifted in accordance with the running condition in the transmission 40. [ At this time, the electronic control clutch 30 controls the power connection between the engine 10 and the transmission 40 under the control of a controller such as the electronic control unit 50 (ECU).

 In the present invention, the electronic control unit 50 is configured to determine whether the motor generator 20 and the electronic controller 20 are in a coasting state, a coasting state, The control clutch 30, and the engine 10 on / off. Preferably, it collects information necessary for grasping whether or not a condition for entering a coasting condition is satisfied from the sensors.

The information required to determine whether or not the coasting entry condition is satisfied is determined by the position value of the accelerator pedal 70 and the brake pedal 80, the current speed of the vehicle, and the gear engagement state information of the transmission 40 Or all of them. When the current state of the vehicle recognized from the collected information meets the condition of entering into the coasting, the vehicle is switched to the running mode (the driving mode) so that the vehicle can move only by the driving inertia.

The switching to the costing mode (the power running mode) may be implemented by a control to release or disengage the electronic control clutch 30 while the engine 10 is running. The coasting entry condition may include a case where the position values of the accelerator pedal 70 and the brake pedal 80 are '0' in a state where the current vehicle speed is equal to or higher than a constant speed.

In some cases, the transmission 40 may further include a state in which the transmission 40 is engaged with one of the three or more speed change gears. Of course, depending on whether the vehicle is in the manual transmission 40 or the automatic transmission 40, depending on the shift mechanism of the vehicle, the entering condition for the course may vary depending on whether the electronic control unit 50 is in the course Or may require additional conditions other than the listed conditions.

On the other hand, when the accelerator pedal 70 is operated in accordance with the driver's re-acceleration of the driver in the running mode, the electronic control unit 50 cancels the costing mode in order to promptly reflect the driver's re-acceleration. Preferably, the electronic control clutch 30 is connected and a power demand is determined when a detection signal is input from an accelerating pedal position sensor (APS) (not shown).

The electronic control unit 50 determines the power demand of the vehicle corresponding to the operation amount of the accelerator pedal 70 and controls the electronic control The clutch 30 is connected. Then, it is determined whether the determined required power value belongs to a preset input range (Threshold), and the power source is determined according to the determination result.

The requested power corresponding to the manipulated variable of the accelerator pedal 70 can be determined in such a manner as to use the output map of the engine 10 storing the output data for each vehicle speed according to the manipulated variable of the accelerator pedal 70 Threshold value may vary depending on vehicle load, motor specifications, battery capacity, and the like, so that it may be determined as an output range capable of replacing the output of the engine 10, though it is not particularly limited.

If the required power value determined in accordance with the operation amount of the accelerator pedal 70 in the off state of the engine 10 according to the costing is smaller than the preset input value If it falls within the range (Threshold), the motor generator 20 is determined as the power source. That is, the engine 10 is controlled to be driven only by the output of the motor generator 20 while keeping the engine 10 in the off state.

Alternatively, if the required power value determined in accordance with the driver's operation of the accelerator pedal 70 during the course of travel exceeds the set range (Threshold), the electronic control unit 50 controls the motor generator 20 up to the set range, And starts driving the engine 10 (On) from a time point exceeding the set range, so that the vehicle is driven to the output of the engine 10.

The electronic control unit 50 specifically includes an information collection unit 52. [ An information collecting unit 52 and a judging unit 54. The judging unit 54 serves to collect information necessary for grasping whether or not the condition for entering the coasting is satisfied. The judging unit 54 judges whether the state of the current vehicle, which is grasped from the information collected through the information collecting unit 52, (Coasting) entry condition is satisfied.

The judging unit 54 also judges whether or not there is a request to cancel the casting mode during the course. For example, when a detection signal is inputted from the accelerator pedal sensor (APS) by the operation of the accelerator pedal 70 during the course of the course, it can be determined that there is a request to cancel the casting mode. That is, whether or not the accelerator pedal 70 is operated in response to the driver's willingness to re-engage.

The signal outputting unit 56 provides the determination result as to whether or not the determination unit 54 has entered the costing mode and the determination about the cancellation of the costing mode in the costing mode. The signal output unit 56 may include a control signal for switching the traveling mode of the vehicle to the traveling mode (the driving state of the vehicle) or releasing the traveling mode according to the determination result by the determination unit 54 To the component to be processed.

The signal output unit 56 outputs the signal to the accelerator pedal 70 when the current state of the vehicle is the coasting entry condition (e.g., the current vehicle speed is equal to or higher than the predetermined speed) When the operation amount is '0'), a release signal is sent to the electronic control clutch 30 and an off signal is sent to the engine 10 to switch to a running mode .

On the other hand, when the accelerator pedal 70 is operated during the course, that is, when the judging unit 54 requests the cancellation mode release, the signal output unit 56 engages the electronic control clutch 30 And sends an output signal to only the motor generator 20 according to the manipulated variable of the accelerator pedal 70 or an output signal to the motor generator 20 and then outputs a signal for driving the engine 10 Can be output.

In the figure, reference numeral 55 denotes a low-voltage battery, and reference numeral 60 denotes a starter motor for starting the engine. And 70 is a low voltage DC-DC converter (LDC) for lowering the high voltage of the high voltage battery 25 to a low voltage suitable for the low voltage battery 55 between the high voltage battery 25 and the low voltage battery 55, converter.

Hereinafter, a process of controlling a costing system performed by the costing system control apparatus of a mild hybrid vehicle according to one aspect of the present invention will be described in connection with the operation of the costing system control apparatus.

FIG. 2 is a flow chart including a specific control algorithm for controlling a casting system, and FIG. 3 is a reference diagram showing a vehicle state at the time of all entering or leaving a costing, and a speed change according to distance in the state.

Referring to FIGS. 2 and 3, a method of controlling a costing system of a mild hybrid vehicle effectively responds to a driver's remorse, preferably re-acceleration, during a course of costing, comprising an information collecting step (S100) (Step S200), a step of entering a costing mode (step S300), a step of determining whether to release a costing step (step S400), a step of canceling a costing step (step S500), and a step of controlling a driving step (step S600).

In the information gathering step (S100), information necessary for grasping the condition of entering the coasting from the respective sensors of the vehicle is collected. Herein, the information necessary for grasping whether or not the coasting entry condition is satisfied in the information collection step includes at least part of the position value of the accelerator pedal and the brake pedal, the current speed of the vehicle, and the gear engagement state information of the transmission .

In the course entering determination step S200, it is determined whether the state of the current vehicle, which is recognized from the information collected in step S100, satisfies the entering condition for the costing. At this time, the entering condition of the costing may include a case where the position value of the accelerator pedal and the brake pedal is '0' in a state where the vehicle speed is equal to or higher than a constant speed, and if the transmission is engaged in any one of the three- A condition can also be included in the condition.

If it is determined in step S200 that the current state of the vehicle satisfies the entering condition of the costing, it is determined whether the current state of the vehicle is in the costing mode in step S300, Is performed. Preferably, when the electronic control clutch for interrupting the power connection is released and it is determined that there is no acceleration intention for a predetermined time (if there is no accelerator pedal manipulation), the engine is turned off to switch to the costing mode.

In the unchecked deciding step S400, it is determined whether there is a request for canceling the running mode while the vehicle is in the inertia of the vehicle in the running mode, that is, the engine is off and the electronic control clutch is released. Preferably, when a signal is input from the accelerator pedal sensor APS while the vehicle is traveling in the costing mode (step S400), it may be determined that there is a request to cancel the casting mode.

If a signal is input from the accelerator pedal sensor APS as a result of the determination of the cancellation of the cancellation, and the cancellation request is received, the process goes to the cancellation step S500. Specifically, in the cancellation step, a connection signal is sent to the electronically controlled clutch to switch the electronically controlled clutch to the power connection side and determine the power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal.

The power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal can be determined by a method using an engine output map storing output data for each vehicle speed according to the manipulated variable of the accelerator pedal, ) May vary depending on the vehicle load, the motor specification, the battery capacity, and the like, so that it can be determined as an output range capable of replacing the engine output, though it is not particularly limited.

Finally, in the drive control step S600, one or more of the motor generator and the engine is controlled according to the required power value determined in the step S500 to satisfy the required power. Preferably, it is determined whether the power demand falls within the preset range (Threshold), and the power source is controlled in a different manner according to the result.

Specifically, when the required power value is within a predetermined input threshold value (Threshold), the vehicle is controlled to be driven only by the output of the motor generator in the engine off state (S602). If the requested power value is within the set range Threshold, , The vehicle is driven only by the motor generator up to the set range A, and the engine starts to be driven from the time when it exceeds the set range, and the vehicle is controlled to be driven by the engine (S604).

According to the apparatus and method for controlling the costing system of a mild hybrid vehicle according to the present invention as described above, when the accelerator pedal is operated by the driver's remorse during coasting, It is possible to improve the fuel consumption loss due to repetition of turning the engine on and off, and the conventional problem of adversely affecting the exhaust gas.

That is, if the output demand value of the driver is lower than a predetermined value when the accelerator pedal is depressed during the costing (driving) of the mild hybrid vehicle in which the engine output is assisted by the motor generator, the output of the motor generator only corresponds to the required output , It is possible to reduce fuel consumption section and emission occurrence, thereby improving the fuel efficiency and exhaust gas problem, and solve the acceleration delay problem.

In addition, in the prior art, vibration has occurred in the re-acceleration state because the engine output has to be raised in a short time during the re-acceleration. However, according to the present invention, until the preset threshold value And then only the output section corresponds to the engine output, thereby minimizing the occurrence of vibration due to the abrupt increase in output in the re-acceleration state.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

10: Engine
20: Motor generator
25: High voltage battery
30: Electronic control clutch
40: transmission
50: Electronic control unit
55: Low voltage battery
60: Starter motor
70: Low-voltage DC converter (LDC)

Claims (14)

1. A mild hybrid system in which an engine output is assisted by a motor generator,
A motor generator installed to receive power from the engine output shaft;
An electronic control clutch that interrupts power connection between the engine and the transmission;
And an electronic control unit (ECU) for controlling the motor generator, the electronic control clutch, and the engine on / off based on the information collected from the sensors of each part of the vehicle,
The electronic control unit collects information necessary for grasping whether or not a condition for entering a coasting condition is satisfied from the sensors, and when the state of the current vehicle recognized from the collected information satisfies a condition for entering a coasting condition, Releasing the electronic control clutch and turning off the engine so as to switch the vehicle to a running mode (driving mode) so that the vehicle can be moved only by the inertial force of the vehicle,
When the accelerator pedal is operated during running in the running mode, the power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal is determined and the electronic control clutch is connected. If the determined required power value is within the predetermined input range Threshold The control unit controls the vehicle to be driven only by the output of the motor generator in the engine off state.
The method according to claim 1,
The information necessary for grasping whether or not the condition for entering the coasting is satisfied,
A position value of the accelerator pedal and the brake pedal, a current speed of the vehicle, and a gear engagement state information of the transmission.
The method according to claim 1,
The condition for entering into the coasting (Coasting)
And a position value of the accelerator pedal and the brake pedal is '0' when the current vehicle speed is equal to or higher than a constant speed.
The method of claim 3,
The condition for entering into the coasting (Coasting)
Further comprising a state in which the transmission is fastened to any one of the speed change gears in three or more stages.
The method according to claim 1,
Wherein the electronic control unit comprises:
When the required power value determined in accordance with the operation of the accelerator pedal of the driver during the running in the costing mode exceeds the set range (Threshold), the vehicle is driven only with the motor generator up to the set range, (On), so that the vehicle is driven by the engine.
The method according to claim 1,
Wherein the electronic control unit comprises:
An information collecting unit for collecting information necessary for grasping whether or not the condition for entering the coasting is satisfied;
A determining unit for determining whether a condition of a current vehicle recognized from the information collected through the information collecting unit satisfies a condition for entering a coasting mode and a request for canceling a casting mode while driving in a running mode;
And a signal output unit for outputting a control signal for switching to the costing mode (kick driving mode) or releasing the costing mode according to the determination result of the determination unit Device.
The method according to claim 6,
Wherein the signal output section comprises:
If the current state of the vehicle satisfies the condition for entering the coasting state, the control unit sends a release signal to the electronic control clutch and sends an off signal to the engine, , ≪ / RTI &
And outputs a signal for engaging the electronic control clutch when a request for canceling the coining mode is issued from the determination unit according to the operation of the accelerator pedal during running in the costing mode, Or sends an output signal to the motor generator, and outputs a signal for driving the engine when the predetermined output is reached.
1. A mild hybrid system in which an engine output is assisted by a motor generator,
An information gathering step of collecting information necessary for grasping the condition of entering the coasting;
A costing entry judgment step of judging whether the state of the current vehicle recognized from the information collected in the information collection step satisfies a condition for entry into a coasting;
A costing mode entering step of switching to a costing mode (batting driving mode) so that the vehicle can be moved only by the driving inertia if the current state of the vehicle satisfies the costing entry condition as a result of the judgment of the entering step of the costing;
Determining whether or not there is a request for canceling a running mode while the vehicle is running in a running mode;
A cancellation releasing step of connecting the electronically controlled clutch and determining a power demand of the vehicle corresponding to the manipulated variable of the accelerator pedal when there is a request to cancel the cancellation as a result of the cancellation; And
And controlling the at least one of the motor generator and the engine to satisfy the required power according to the required power value determined in the step of releasing the costing.
9. The method of claim 8,
The information necessary for grasping the satisfaction of the condition for entering the coasting in the information gathering step may be,
A position value of an accelerator pedal and a brake pedal, a current speed of the vehicle, and a gear engagement state information of the transmission. The method of controlling a costing system of a mild hybrid vehicle,
9. The method of claim 8,
The condition for entering into the coasting (Coasting)
And the position value of the accelerator pedal and the brake pedal is '0' when the current vehicle speed is equal to or higher than a constant speed.
11. The method of claim 10,
The condition for entering into the coasting (Coasting)
Further comprising a state in which the transmission is fastened to one of the speed change gears in three or more stages.
9. The method of claim 8,
In the entering the costing mode,
A course of a mild hybrid vehicle that releases an electronic control clutch that interrupts the power connection between the engine and the transmission and turns the engine off so as to switch to a running mode in which the vehicle can move only with inertia of inertia Controlling system.
9. The method of claim 8,
And when the accelerator pedal operation signal is inputted while the vehicle is traveling in the costing mode, it is determined that there is a request to cancel the costing mode in the costing release determination step.
9. The method of claim 8,
In the drive control step,
The vehicle is driven only by the output of the motor generator in the engine off state if it is within a predetermined input range (Threshold) according to the required power value determined in the costing releasing step,
When the required power value exceeds the set threshold value, the vehicle is driven only by the motor generator up to the set range, and the engine starts to be driven from the time point exceeding the set range to drive the vehicle to the engine. A method of controlling a costing system of a vehicle.

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