KR20150108512A - Mild hybrid apparatus and method for increasing power of recovery thereof - Google Patents

Abstract

According to one embodiment of the present invention, a regeneration efficiency improving method of a mild hybrid apparatus comprises: a first step of determining a required braking amount based on the input amount of a brake pedal; a second step of determining the wheel brake braking amount and the hybrid regeneration braking amount based on the required braking amount and a charge rate of a high-voltage battery; and a third step of generating wheel brake braking and hybrid regeneration braking based on the wheel brake braking amount and the hybrid regeneration braking amount.

Description

[0001] MILD HYBRID APPARATUS AND METHOD FOR INCREASING POWER OF RECOVERY THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid device and a regeneration efficiency increasing method using the same, and more particularly, to an apparatus and a method for efficiently storing energy lost in heat from a brake in a high voltage battery using a motor driving booster.

The rising oil prices and the increasing social interest in the environment have caused the automobile industry to accelerate the fuel efficiency of vehicles and the development of environmentally friendly vehicles. To meet this demand, a mild hybrid system that regenerates the deceleration energy of the vehicle has appeared .

1 is a block diagram of a conventional mild hybrid device. Referring to FIG. 1, a conventional mild hybrid device includes a motor-generator 2 having both functions of a motor and a generator and interlocked with the engine 1, and the motor-generator 2 functions as an engine- The generator 1 is supplied with driving power through the inverter 3 and serves as an auxiliary power for the engine 1 and generates electricity by using thermal energy generated during braking of the vehicle when the generator is in operation, Supply electricity. Such a mild hybrid device has an advantage that a hybrid system can be implemented by replacing an existing alternator without changing the structure of a conventional internal combustion engine vehicle.

However, when a belt-driven mild hybrid system is applied to an internal combustion engine equipped with a conventional conventional brake system, it takes a limited time to store the regenerative energy through the hybrid system due to the intervention of the brake. In particular, when the state of charge (SoC) of the high-voltage battery 4 is low, it is required to recover the maximum amount of regenerative energy within a short time. Therefore, in the conventional brake system, It is difficult to operate the battery efficiently because of time constraints. Also, when excessive regenerative braking occurs in order to increase the energy recovery efficiency in the state where the existing brake system is operated, there is a sense of heterogeneity in braking to the driver.

The following prior art documents relate to a regenerative braking method in a mild hybrid system in which an integrated motor-generator is automatically switched to a generator mode and a motor mode according to various operating states of a vehicle under running, and the technical gist of the present invention is included not.

Korean Patent Publication No. 10-2007-0030363

In order to solve the above-mentioned problems, the present invention provides a regeneration efficiency increasing method using a mild hybrid device and a mild hybrid device according to another embodiment of the present invention.

A mild hybrid device capable of increasing regenerative energy recovery efficiency and transmitting a feeling of dynamism of a vehicle to a driver, and a method using the same.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

A method for increasing the regenerative efficiency of a mild hybrid device according to an embodiment of the present invention includes a first step of determining a demanded braking amount based on a brake pedal input amount and a second step of determining a required braking amount based on the required braking amount and the charging rate of the high- And a third step of generating wheel brake braking and hybrid regenerative braking based on the second step of determining the hybrid regenerative braking amount and the wheel brake braking amount and the hybrid regenerative braking amount.

The second step includes a second step of determining whether the charging rate of the high voltage battery is equal to or greater than a preset value, and a second step of determining whether the charging rate of the high voltage battery is higher than a preset value, And a second step of setting the hybrid regenerative braking amount to be lower than the wheel brake braking amount when the charging rate of the high voltage battery is less than a predetermined value.

The second step includes a second step of determining whether a sum of the wheel brake braking amount and the hybrid regenerative brake braking amount set in step 2-2 is equal to the required braking amount, And the hybrid regenerative braking amount is determined to be equal to the required braking amount, a second step of determining a wheel brake braking amount and a hybrid regenerative braking amount for actual braking.

The second step further includes a second step of determining whether a sum of the wheel brake braking amount and the hybrid regenerative brake braking amount set in step 2-2 is equal to the required braking amount, It is preferable to perform the first step of determining the required brake braking amount based on the brake pedal input amount when it is determined that the sum of the wheel brake braking amount and the hybrid regenerative brake braking amount is not equal to the required brake braking amount.

And a fourth step of generating a brake pedal depression based on at least one of the wheel brake braking amount and the hybrid regenerative braking amount.

And the motor drive brake booster receives the wheel brake braking amount to generate the wheel brake braking.

A mild hybrid device according to another embodiment of the present invention includes an electronic control unit for determining a wheel brake braking amount and a hybrid regenerative braking amount based on a brake pedal input amount and a charging rate of a high voltage battery, And an inverter for receiving the hybrid regenerative braking amount from the electronic control unit and controlling the charging of the high voltage battery.

The electronic control unit preferably determines the requested braking amount based on the brake pedal input amount.

Wherein the electronic control unit determines whether the charging rate of the battery is equal to or greater than a preset value and sets the hybrid regenerative braking amount to be higher than the wheel brake braking amount when the charging rate of the high- It is preferable that the hybrid regenerative braking amount is set to be lower than the wheel brake braking amount when the charging rate of the high-voltage battery is less than a predetermined value.

Wherein the electronic control unit determines whether or not the sum of the wheel brake braking amount and the hybrid regenerative braking amount is equal to the required braking control amount and if the sum of the wheel braking braking amount and the hybrid regenerative braking amount is equal to the required braking control amount And if it is determined that they are the same, the wheel brake braking amount and the hybrid regenerative braking amount are transmitted to the motor driving brake booster and the inverter, respectively.

The motor drive brake booster or the electronic control unit preferably generates a brake pedal depression based on at least one of the wheel braking amount or the hybrid regenerative braking amount.

The method for increasing the efficiency of regeneration using the mild hybrid device according to an embodiment of the present invention and the mild hybrid device according to another embodiment apply a brake system using a motor booster so that the wheel brake braking amount and the hybrid regenerating amount It is possible to increase the regenerative energy recovery efficiency of the hybrid device by variably changing the amount of the braking, and furthermore, it is possible to transmit the feeling of dynamism of the vehicle to the driver.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a block diagram of a conventional mild hybrid device.
FIG. 2 is a flowchart illustrating a method for increasing a regeneration efficiency using a mild hybrid apparatus according to an embodiment of the present invention.
FIG. 3 is a flow chart illustrating the second step of FIG. 2 in a time-wise manner.
4 is a block diagram of a mild hybrid device according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Hereinafter, with reference to FIGS. 2 to 4, a method for increasing the efficiency of regeneration using the mild hybrid device according to an embodiment of the present invention and a mild hybrid device according to another embodiment of the present invention will be described.

FIG. 2 is a flow chart illustrating a method of increasing the regeneration efficiency using the mild hybrid apparatus according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating the second step of FIG. 2 in a time- . 4 is a block diagram of a mild hybrid device according to another embodiment of the present invention.

Before describing the method for increasing the regeneration efficiency using the mild hybrid device according to an embodiment of the present invention, the overall configuration of the mild hybrid device according to the present invention will be described with reference first to FIG.

The motor-generator 800 shown in FIG. 4 is configured to be interlocked with the engine 700 by a belt. The motor-generator 800 is a configuration capable of both a start motor for starting the engine and a generator capable of generating an AC voltage.

Specifically, in the case of functioning as a start motor, the drive power is supplied through the inverter 400 to serve as an auxiliary power for the engine power. When the motor functions as a generator, energy lost by heat generated when the vehicle is braked is converted into electric energy, (300).

Particularly, the mild hybrid device has an idle stop & go (ISG) function in which when the vehicle is stopped for a long time, the vehicle is automatically turned off and then the vehicle is restarted, The voltage charged in the high-voltage battery 300 is supplied to the electric battery 900 through the DC-DC power inverter 910 when the voltage is equal to or higher than the reference voltage.

The inverter 400 converts electric energy supplied from the high-voltage battery 300 and supplies the converted electric energy to the motor-generator 800, or the motor-generator 800 converts the electric energy supplied from the high- And converts the electric energy developed in the battery 800 to supply it to the high voltage battery 300.

Generally, the high-voltage battery 300 is composed of a super-capacitor module constituted by a plurality of supercapacitors. The high-voltage battery 300 stores regenerative braking electric energy in the motor-generator 800 when the vehicle decelerates, And supplies electric energy to assist the engine torque.

The brake pedal 600 performs a function of receiving the driver's pedal pressure and the motor driving brake booster 200 is interlocked with the brake pedal 600. The motor driving brake booster 200 is driven by the motor control brake booster 200 The master cylinder generates the hydraulic pressure to generate the braking force. The caliper 500 connected to the motor drive brake booster 200 can change the oil pressure generated by the motor control in the motor drive brake booster 200 to a frictional force, thereby generating a braking force in the wheel brake.

The electronic control unit 100 plays a role of determining the wheel brake braking amount and the hybrid regenerative braking amount based on the input amount of the brake pedal 600 and the charging ratio SoC of the high-voltage battery 300. [

A description will now be given of a method for increasing the regenerative efficiency of a mild hybrid device according to an embodiment of the present invention, with reference to FIGS. 2 and 3, illustrating an overall configuration of the mild hybrid device according to the present invention.

As shown in FIG. 2, the method for increasing the regeneration efficiency of a mild hybrid device according to an embodiment of the present invention includes a first step (S100) of determining a required braking amount, a wheel brake braking amount and a hybrid regenerative braking amount A second step (S200), and a third step (S300) of generating wheel brake braking and hybrid regenerative braking.

In the first step S100, a braking amount actually required is determined based on the amount of pedal input by the driver through the brake pedal 600. [

In the second step S200, a wheel brake braking amount and a hybrid regenerative braking amount are determined based on the requested braking amount determined in the first step S100 and the charging rate of the high-voltage battery 300. [

Here, the wheel brake braking amount refers to an amount of braking that operates the actual wheel brake through the oil pressure generated by the motor control in the motor-driven booster 110, and the hybrid regenerative braking amount is lost from the brake to the heat Means the amount of braking to convert energy into electrical energy through a hybrid device and store it in the battery.

Specifically, the second step S200 can be divided into four steps: a first step S210 to a second step S240.

Step 2-1 (S210) is a step of determining whether the charge rate SoC of the high-voltage battery 300 is equal to or greater than a predetermined value. The preset value may be an absolute value, May be a relative value to be compared with.

If the charging rate of the high-voltage battery 300 is equal to or greater than the reference value, the second regenerative braking amount is set to be higher than the wheel braking braking amount, and the high-voltage battery 300 (step S220) Is less than a predetermined value, the hybrid regenerative braking amount is set to be lower than the wheel braking braking amount, and the wheel braking braking amount and the hybrid regenerative braking amount are varied through the second-2 step (S220) .

Step 2-3 of S230 is a step of determining whether the sum of the wheel brake braking amount and the hybrid regenerative braking amount set in step 2-2 (S220) is equal to the required braking amount determined in the first step S100 to be.

If it is determined in step S240 that the sum of the wheel brake braking amount and the hybrid regenerative braking amount is equal to the required braking amount, step 2-4 (S240) The same amount and hybrid regenerative braking amount are finally determined.

Conversely, when it is determined in step S230 that the sum of the wheel brake braking amount and the hybrid regenerative braking amount is not equal to the requested braking amount, the requested braking amount is determined based on the brake pedal input amount The first step S100 is performed again.

That is, assuming that the sum of the wheel brake braking amount and the hybrid regenerative braking amount is the required braking amount determined in the first step (S100), both of them must be variably changed within the required braking amount. ), It is confirmed whether or not there is an error in calculating the wheel brake braking amount or the hybrid regenerative braking amount.

It is preferable that the method further includes a fourth step S400 of generating a brake pedal depression based on at least one of a wheel braking amount or a hybrid regenerative braking amount after the third step S300.

Also, as described above, the motor-drive brake booster 200 receives the wheel brake braking amount and generates wheel brake braking.

Hereinafter, a mild hybrid device according to another embodiment of the present invention will be described with reference to FIG. 4, and redundant contents of the method for increasing the regenerative efficiency of the mild hybrid device according to an embodiment of the present invention described above will be described in detail .

The mild hybrid device according to another embodiment of the present invention includes an electronic control unit 100, a motor drive brake booster 200, and an inverter 400.

The electronic control unit 100 determines the amount of wheel brake braking and the amount of hybrid regenerative braking based on the input amount of the brake pedal 600 and the charging rate of the high-voltage battery 300. [

In particular, the electronic control unit 100 determines the requested braking amount based on the input amount of the brake pedal 600, determines whether the charging rate of the high-voltage battery 300 is equal to or greater than a preset value, The regenerative braking amount is set to be higher than the wheel brake braking amount and the hybrid regenerative braking amount is set to be lower than the wheel braking braking amount when the regenerative braking amount is less than the preset value.

Further, the electronic control unit 100 determines whether the sum of the wheel braking braking amount and the hybrid regenerating braking amount is equal to the demand braking amount, and when it is determined that the sum is equal to the required braking amount, the motor drive brake booster 200 and the inverter 400 Wheel brake braking amount and the hybrid regenerating braking amount, respectively.

The motor drive brake booster 200 receives the wheel brake braking amount from the electronic control unit 100 and controls the wheel brake 500.

Further, the inverter 400 receives the hybrid regenerative braking amount from the electronic control unit 100 and controls the charging of the high-voltage battery 300.

In particular, it is also possible for the motor-driven brake booster 200 or the electronic control unit 100 to generate a brake pedal depression based on at least one of a wheel brake braking amount or a hybrid regenerative braking amount.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not intended to limit the scope of the present invention but to limit the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. It should be interpreted.

100: Electronic control unit
200: Motor-driven brake booster
300: High-voltage battery
400: Inverter
500: Caliper (wheel brake)
600: Brake pedal
700: engine
800: Motor-generator
900: Battery for electric field
910: DC-DC power converter

Claims (11)

A first step (S100) of determining a requested braking amount based on an input amount of the brake pedal (600);
A second step (S200) of determining a wheel brake braking amount and a hybrid regenerative braking amount based on the requested braking amount and the charging rate of the high voltage battery (300); And
A third step (S300) of generating wheel brake braking and hybrid regenerative braking based on the wheel brake braking amount and the hybrid regenerative braking amount;
Wherein the regeneration efficiency of the mild hybrid device is increased.
The method according to claim 1, wherein the second step (S200)
A second step (S210) of determining whether the charging rate of the high-voltage battery 300 is equal to or greater than a preset value; And
The hybrid regenerative braking amount is set to be higher than the wheel brake braking amount when the charging rate of the high-voltage battery 300 is equal to or greater than a preset value, and when the charging rate of the high- A second-2 step (S220) of setting the wheel brake braking amount to be lower than the wheel brake braking amount;
Wherein the regeneration efficiency of the mild hybrid device is increased.
3. The method of claim 2, wherein the second step (S200)
A second step (S230) of determining whether a sum of the wheel braking braking amount and the hybrid regenerative braking amount set in the step 2-2 (S220) is equal to the required braking amount; And
(S240) of determining a wheel brake braking amount and a hybrid regenerative braking amount for actual braking when it is determined that the sum of the wheel brake braking amount and the hybrid regenerative braking amount is equal to the required braking amount;
Wherein the regenerative efficiency of the mild hybrid device is improved.
3. The method of claim 2, wherein the second step (S200)
A second step (S230) of determining whether a sum of the wheel braking braking amount and the hybrid regenerative braking amount set in the step 2-2 (S220) is equal to the required braking amount;
Further comprising:
And a first step (S100) of determining a requested braking amount based on a brake pedal input amount when it is determined that the sum of the wheel braking braking amount and the hybrid regenerative braking amount is not equal to the requested braking amount Increasing the efficiency of regeneration.
The method according to claim 1,
A fourth step (S400) of generating a brake pedal depression based on at least one of the wheel braking amount or the hybrid regenerative braking amount;
Wherein the regenerative efficiency of the mild hybrid device is improved.
The method according to claim 1,
Wherein the motor drive brake booster receives the wheel brake braking amount to generate wheel brake braking.
An electronic control unit (100) for determining a wheel brake braking amount and a hybrid regenerative braking amount based on an input amount of the brake pedal (600) and a charging rate of the high voltage battery (300);
A motor drive brake booster 200 that receives the wheel brake braking amount from the electronic control unit 100 and controls the wheel brake 500; And
An inverter (400) for receiving the hybrid regenerative braking amount from the electronic control unit (100) and controlling charging of the high voltage battery (300);
And a magnetic hybrid device.
8. The method of claim 7,
Wherein the electronic control unit (100) determines a requested braking amount based on an input amount of the brake pedal (600).
9. The method of claim 8,
The electronic control unit 100 determines whether the charging rate of the high-voltage battery 300 is equal to or greater than a preset value,
When the charging rate of the high-voltage battery (300) is equal to or greater than a predetermined value, the hybrid regenerative braking amount is set to be higher than the wheel brake braking amount,
And sets the hybrid regenerative braking amount to be lower than the wheel brake braking amount when the charging rate of the high-voltage battery (300) is less than a predetermined value.
10. The method of claim 9,
The electronic control unit (100) determines whether the sum of the wheel brake braking amount and the hybrid regenerative braking amount is equal to the required braking amount,
When it is determined that the sum of the wheel braking braking amount and the hybrid regenerative braking amount is equal to the required braking amount, the motor-driving-brake booster 200 and the inverter 400 are supplied with the wheel-brake braking amount and the hybrid regenerative braking amount Respectively.
8. The method of claim 7,
Wherein the motor drive brake booster (200) or the electronic control unit (100) generates a brake pedal depression based on at least one of the wheel braking amount or the hybrid regenerative braking amount.

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