Different target pressure control method for each wheel of the integrated electric brake system and the integrated electric brake system implemented by the method

Abstract

The present invention provides a method for controlling different target pressures for each wheel of an integrated electric brake system and an integrated electric brake system implemented thereby, characterized by controlling to apply different target pressures to each wheel, and simultaneously applying pressure to each wheel by adjusting the current of the inlet valve of each wheel to be pressurized.

Description

Technology Field

[0001] The present invention relates to a method for controlling different target pressures for each wheel of an integrated electric brake system and an integrated electric brake system implemented thereby. Specifically, the invention relates to a method for controlling different target pressures for each wheel of an integrated electric brake system and an integrated electric brake system implemented thereby, wherein when a request for pressurization of different target pressures for each wheel occurs in the integrated electric brake system, pressurization is applied simultaneously through the control of the inflow valve current of each wheel. Background Technology

[0003] Vehicles are equipped with essential braking systems, and recently, various types of systems have been proposed to achieve stronger and more stable braking power.

[0004] An example of this is the Integrated Dynamic Brake (IDB) system.

[0005] The integrated electric brake system generates stable and powerful braking force by integrating a master booster and Electronic Stability Control (ESC).

[0006] This integrated electric brake system includes a pressure generating device that operates a motor by outputting the operation of the brake pedal as an electrical signal through a pedal displacement sensor and converts the rotational force of the motor into linear motion to generate braking hydraulic pressure, a valve block equipped with multiple valves to control braking operation by receiving hydraulic pressure through the force generated by the pressure supply device, and an electronic control unit that controls the motor and valves.

[0007] More specifically, the integrated electric brake system operates a pressure generating device in response to the operation of the brake pedal to generate the braking pressure required by the driver and transmit hydraulic pressure to the wheel cylinders installed on each wheel.

[0008] At this time, the pressure generating device comprises a motor, a ball screw nut that converts rotational force resulting from the operation of the motor into linear motion, and a linear pump that is pressurized by the ball screw nut.

[0009] In other words, braking pressure is generated by pressurizing the piston of the linear pump.

[0010] In addition, in the event of a system error, braking pressure is transmitted from the master cylinder to the wheel cylinder by the force applied to the brake pedal.

[0011] This integrated electric brake system is designed to provide strong and stable braking force by installing a separate pressure generating device.

[0012] Figure 1 is a flowchart showing different target pressure control methods for each wheel of an integrated electric brake system according to the prior art.

[0013] In such conventional integrated electric brake systems, since it is impossible to generate independent pressure for each circuit using only the motor due to the hydraulic circuit structure, the target individual wheel pressure is generated by controlling the wheel inlet valve current and the wheel outlet valve open time of each individual wheel.

[0014] That is, in a conventional integrated electric brake system, as shown in FIG. 1, if two or more different target pressures are requested from individual wheels and there is a request for pressure to be applied to the wheel to be controlled, the electronic control unit sequentially opens and closes the inlet valves of each wheel to be controlled to apply pressure. If two or more different target pressures are not requested from individual wheels, the electronic control unit opens the inlet valves of the wheel to be controlled, and if two or more different target pressures are requested from individual wheels and there is no request for pressure to be applied to the wheel to be controlled, the electronic control unit controls the inlet valves of the wheel to be controlled to close.

[0016] Figure 2 is a schematic diagram showing the state of alternating control of each wheel through a general FIFO (first-in, first-out) structure, and Figure 3 is a schematic diagram showing the state in which pressure control of each wheel is performed through the alternating control of Figure 2.

[0017] In a conventional integrated electric brake system like this, the method of applying different target pressures to each wheel by individual wheel control is carried out by sequentially opening and closing each wheel inlet valve that has received a pressure request, as shown in FIG. 2, and pushing in a flow rate equal to the requested pressure.

[0018] However, according to this conventional method, the valve operates frequently, resulting in loud noise, and there is a problem of slow response to pressurization requests because pressurization is applied alternately.

[0019] In addition, according to the conventional method, as shown in Fig. 3, the wheel pressure rise occurs in a discontinuous step shape, which has the problem of being slow and disadvantageous for controlling vehicle movement. Prior art literature

[0021] (Patent Document 0001) KR 10-2017-0046919 A The problem to be solved

[0022] The present invention has been devised to solve various conventional problems as described above, and aims to provide a method for controlling different target pressures for each wheel of an integrated electric brake system and an integrated electric brake system implemented thereby, which can increase the pressure response speed of each wheel and reduce operating noise by simultaneously applying pressure through inlet valve current control of each wheel when a request for pressure application of different target pressures for each wheel occurs in the integrated electric brake system. means of solving the problem

[0024] To achieve the above objectives, a method for controlling different target pressures for each wheel of an integrated electric brake system according to the first aspect of the present invention is characterized in that, when two or more different target pressures are requested from individual wheels and there is a request for pressure application to the wheel to be controlled and the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the individual wheel to be controlled is adjusted by the control of an electronic control unit to apply pressure simultaneously, and when two or more different target pressures are not requested from the individual wheels, the electronic control unit controls the inlet valve of the wheel to be controlled to open.

[0025] At this time, the current is sent to zero to the inlet valve of the wheel where the largest target pressure among two or more different target pressures is requested from the individual wheels, thereby opening it completely.

[0026] In addition, a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is supplied to the inlet valves of each wheel, excluding the wheel where the largest target pressure is requested.

[0027] The current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve.

[0028] This hardware test is performed by applying an arbitrary current to the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valves of each wheel open.

[0029] Alternatively, the present invention may provide a method for controlling different target pressures for each wheel of an integrated electric brake system, characterized in that, when two or more different target pressures are requested from individual wheels and a request for pressure is made to a wheel to be controlled, and when the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the individual wheel to be controlled is adjusted by the control of an electronic control unit to apply pressure simultaneously, and the electronic control unit controls the inlet valve of the wheel to which the highest target pressure is requested among two or more different target pressures to be controlled to perform circuit pressure feedback control by fully opening the inlet valve of the wheel to which the highest target pressure is requested.

[0030] At this time, a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is supplied to the inlet valves of each of the remaining wheels, excluding the wheel where the largest target pressure was requested.

[0031] In addition, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve.

[0032] This hardware test is performed by applying an arbitrary current to the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valves of each wheel open.

[0033] In another way, according to the method for controlling different target pressures for each wheel of the integrated electric brake system of the present invention, the electronic control unit controls the inlet valve of the wheel for which the largest target pressure among two or more different target pressures is requested to fully open the inlet valve to perform circuit pressure feedback control, and transmits a current to the inlet valves of each wheel other than the wheel for which the largest target pressure is requested to maintain the difference between the circuit pressure and the target pressure of each wheel, so that when two or more different target pressures are requested in the individual wheel and there is a request for pressurization to the wheel to be controlled and the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the individual wheel to be controlled is adjusted by the control of the electronic control unit to simultaneously apply pressure.

[0034] At this time, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve.

[0035] This hardware test is performed by applying an arbitrary current to the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valves of each wheel open.

[0036] In another way, the present invention may also provide a method for controlling different target pressures for each wheel of an integrated electric brake system, characterized by controlling the application of different target pressures for each wheel, and simultaneously applying pressure to each wheel by adjusting the current of the inlet valve of each wheel to be pressurized.

[0037] At this time, the electronic control unit controls the circuit pressure feedback control by fully opening the inlet valve of the wheel where the largest target pressure among two or more different target pressures is requested in each wheel.

[0038] In addition, a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is supplied to the inlet valves of each wheel, excluding the wheel where the largest target pressure is requested.

[0039] In addition, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve. This hardware test is performed by applying an arbitrary current to each of the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valve of each wheel opens.

[0041] The integrated electric brake system according to the second aspect of the present invention is implemented by a method of controlling different target pressures for each wheel of the integrated electric brake system according to the first aspect of the present invention described above.

[0042] An integrated electric brake system according to the second aspect of the present invention comprises a master cylinder that receives pedal force and generates hydraulic pressure, a pedal simulator that provides a reaction force according to the displacement of the pedal, a pressure generating unit including a pump for supplying oil to the master cylinder and a motor connected to the pump, a valve block having a plurality of valves installed to open and close the flow of the oil, and an electronic control unit that controls the motor of the pressure generating unit and the plurality of valves of the valve block. In the case where two or more different target pressures are requested from individual wheels and there is a request for pressurization to a wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the wheel to be controlled is adjusted by the control of the electronic control unit to apply pressure simultaneously, and the electronic control unit controls the inlet valve of the wheel to which the highest target pressure among the two or more different target pressures is requested to be fully opened to perform circuit pressure feedback control.

[0043] At this time, a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is supplied to the inlet valves of each of the remaining wheels, excluding the wheel where the largest target pressure was requested.

[0044] In addition, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve.

[0046] Specific details of other embodiments are included in "Specific details for carrying out the invention" and the attached "drawings".

[0047] The advantages and / or features of the present invention and the methods for achieving them will become clear by referring to the various embodiments described in detail below together with the accompanying drawings.

[0048] However, it should be understood that the present invention is not limited to the configurations of each embodiment disclosed below, but may be implemented in various different forms, and that each embodiment disclosed in this specification is provided merely to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and that the present invention is defined only by the scope of each claim of the claims. Effects of the invention

[0050] According to the means for solving the aforementioned problem, the present invention has the following effects.

[0051] The present invention has the effect of increasing the pressure response speed of each wheel and reducing operating noise by controlling the inlet valve of each individual wheel to be controlled by controlling the current of each individual wheel to be pressurized simultaneously when two or more different target pressures are requested from individual wheels and there is a request for pressure to be applied to the wheel to be controlled, and when the target pressure of the wheel to be controlled is not the highest, the electronic control unit controls the opening of the inlet valve of the wheel to be controlled. Brief explanation of the drawing

[0053] Figure 1 is a flowchart showing different target pressure control methods for each wheel of an integrated electric brake system according to the prior art. Figure 2 is a schematic diagram showing the state of alternately controlling each wheel through a general FIFO (first-in, first-out) structure. Figure 3 is a schematic diagram showing the state in which pressure control of each wheel is performed through the alternating control of Figure 2. FIG. 4 is a flowchart illustrating different target pressure control methods for each wheel of an integrated electric brake system according to the present invention. FIG. 5 is a schematic diagram of synchronous control for calculating an inlet valve current capable of maintaining the difference between the circuit pressure and the pressure of the control wheel in a method for controlling different target pressures for each wheel of an integrated electric brake system according to the present invention. Figure 6 is a graph showing the inlet valve current capable of maintaining the difference between the circuit pressure calculated through the synchronous control of Figure 5 and the pressure of the control wheel. Figure 7 is a graph showing the control range for obtaining the inlet valve current value corresponding to the difference between the circuit pressure and the control wheel pressure. Figure 8 is a graph illustrating a hardware test (HW Test) to find the pressure difference at the point when the inlet valve opens by applying an arbitrary inlet valve current and gradually increasing the circuit pressure. Figure 9 is a graph showing the pressure difference values ​​obtained by repeatedly performing the hardware test of Figure 8 while changing the inlet valve current. Specific details for implementing the invention

[0054] Hereinafter, a method for controlling different target pressures for each wheel of an integrated electric brake system according to the present invention and a preferred embodiment of the integrated electric brake system implemented thereby will be described in detail with reference to the attached drawings. For reference, the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention, they must be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Furthermore, the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all aspects of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0056] FIG. 4 is a flowchart illustrating different target pressure control methods for each wheel of an integrated electric brake system according to the present invention.

[0057] The method for controlling different target pressures for each wheel of an integrated electric brake system according to the present invention is configured such that, when two or more different target pressures are requested from individual wheels and there is a request for pressure application to the wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of the inlet valve of each individual wheel to be controlled is adjusted by the control of an electronic control unit to apply pressure simultaneously.

[0058] That is, the electronic control unit controls the inlet valve of the wheel where the largest target pressure among two or more different target pressures is requested to fully open the inlet valve to perform circuit pressure feedback control, and sends current to the inlet valves of each of the remaining wheels, excluding the wheel where the largest target pressure is requested, to maintain the difference between the circuit pressure and the target pressure of each of the remaining wheels.

[0059] If two or more different target pressures are not requested from individual wheels, the electronic control unit controls the inlet valve of the wheel to be controlled to open.

[0060] In addition, if two or more different target pressures are requested from individual wheels and there is no request for pressurization to the wheel to be controlled, the electronic control unit controls the inlet valve of the wheel to be controlled to close.

[0061] Accordingly, the pressurization response speed of each individual wheel can be increased, and noise generated during valve operation can be reduced.

[0062] Here, the brake hydraulic circuit refers to a circuit configured according to the arrangement of oil delivered from the master cylinder.

[0064] FIG. 5 is a schematic diagram of synchronous control for calculating an inlet valve current capable of maintaining the difference between the circuit pressure and the control wheel pressure in a different target pressure control method for each wheel of an integrated electric brake system according to the present invention, FIG. 6 is a graph showing the inlet valve current capable of maintaining the difference between the circuit pressure and the control wheel pressure calculated through the synchronous control of FIG. 5, and FIG. 7 is a graph showing a control range for obtaining an inlet valve current value corresponding to the difference between the circuit pressure and the control wheel pressure.

[0065] Among two or more different target pressures in individual wheels, the inlet valve of the wheel (main wheel) where the largest target pressure is requested sends the current to zero to fully open it.

[0066] In addition, current is supplied to the inlet valves of each of the remaining wheels (sub-wheels), excluding the wheel (main wheel) where the largest target pressure is requested, to maintain the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels).

[0067] At this time, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) is extracted through a specific hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) and the characteristics of each inlet valve.

[0068] Such synchronous control is a mechanism and method designed to accurately control the flow of control between two or more processes when they are proceeding within a certain time interval in coordination with the occurrence of a specific event. While this synchronous control is performed using hardware mechanisms such as interrupts, it is often resolved primarily through software.

[0069] Meanwhile, the aforementioned hardware test is performed by applying an arbitrary current to the inlet valves of each of the remaining wheels (sub-wheels) and gradually increasing the circuit pressure to find the difference between the circuit pressure at the point when the inlet valves of each of the remaining wheels (sub-wheels) open and the pressure of each of the remaining wheels (sub-wheels).

[0070] In Fig. 6, A is the circuit pressure of the integrated electric brake system (IDB), B is the target pressure of the main wheel (the wheel for which the largest target pressure is requested), C is the pressure of the main wheel, D is the target pressure of the sub-wheel (each wheel other than the one for which the largest target pressure is requested), E is the pressure of the sub-wheel, F is the sub-wheel inlet valve current, and G is the main wheel inlet valve current.

[0072] Figure 8 is a graph illustrating a hardware test (HW Test) to find the pressure difference at the point when the inlet valve opens by applying an arbitrary inlet valve current and gradually increasing the circuit pressure, and Figure 9 is a graph showing the pressure difference values ​​obtained by repeatedly performing the hardware test of Figure 8 while changing the inlet valve current.

[0073] The current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) is extracted through a specific hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) and the characteristics of each inlet valve.

[0074] This hardware test is performed by applying an arbitrary current to the inlet valve of each of the remaining wheels (sub-wheels) and gradually increasing the circuit pressure to find the difference between the circuit pressure at the point when the inlet valve of each wheel (sub-wheel) opens and the pressure of each wheel (sub-wheel).

[0075] In Fig. 8, x is an arbitrary inlet valve current value, and y is an arbitrary pressure difference value.

[0076] If a hardware test like the one in Fig. 8 is repeated while changing the inlet valve current, data like the one in Fig. 9 can be extracted.

[0077] In Fig. 9, Frnt delP represents the pressure of the front wheel for any inlet valve current, and Rear delP represents the pressure of the rear wheel for any inlet valve current.

[0079] Meanwhile, the integrated electric brake system according to the second aspect of the present invention is implemented by a method of controlling different target pressures for each wheel of the integrated electric brake system according to the first aspect of the present invention described above.

[0080] The integrated electric brake system according to the present invention comprises a master cylinder that receives pedal force and generates hydraulic pressure, a pedal simulator that provides a reaction force according to the displacement of the pedal, a pressure generating unit including a pump for supplying oil to the master cylinder and a motor connected to the pump, a valve block equipped with a plurality of valves for opening and closing the flow of oil, and an electronic control unit that controls the motor of the pressure generating unit and the plurality of valves of the valve block. The system is characterized by the fact that when two or more different target pressures are requested from individual wheels and there is a request for pressure application to the wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the individual wheel to be controlled is adjusted by the control of the electronic control unit to apply pressure simultaneously.

[0081] The detailed configuration of the master cylinder, pedal simulator, pressure generating unit, valve block, and electronic control unit is described in detail in Korean Published Patent No. 10-2017-0046919 filed and disclosed by the applicant, so a description thereof will be omitted here.

[0082] The electronic control unit employed in the integrated electric brake system according to the present invention controls the circuit pressure feedback control by fully opening the inlet valve of the wheel (main wheel) where the largest target pressure among two or more different target pressures is requested.

[0083] At this time, current is supplied to the inlet valves of each of the remaining wheels (sub-wheels), excluding the wheel (main wheel) where the highest target pressure is requested, to maintain the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels).

[0084] In addition, the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) is extracted through a specific hardware test that performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels (sub-wheels) and the characteristics of each inlet valve.

[0085] As such, the present invention has the advantage of increasing the pressure response speed of each wheel and reducing operating noise by controlling the current of each individual wheel's inlet valve by the control of an electronic control unit to simultaneously apply pressure when two or more different target pressures are requested from individual wheels and there is a request for pressure application to the wheel to be controlled, and when the target pressure of the wheel to be controlled is not the highest, the electronic control unit controls the opening of the inlet valve of the wheel to be controlled.

[0087] The present invention described above is not limited by the aforementioned embodiments and attached drawings, and it will be obvious to those skilled in the art that various substitutions, modifications, and changes are possible within the scope of the technical concept of the present invention.

Claims

Claim 1 A method for controlling different target pressures for each wheel of an integrated electric brake system, characterized in that, when two or more different target pressures are requested from individual wheels and there is a request for pressurization to the wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of each inlet valve of the individual wheel to be controlled is adjusted by the control of an electronic control unit to apply pressure simultaneously; when two or more different target pressures are not requested from the individual wheels, the electronic control unit controls the inlet valve of the wheel to be controlled to open, and a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is transmitted to the inlet valves of each of the remaining wheels, excluding the wheel to which the highest target pressure is requested, and the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test, wherein the hardware test is performed by applying an arbitrary current to each of the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each of the wheels at the point when the inlet valves of each of the wheels are opened. Claim 2 A method for controlling different target pressures for each wheel of an integrated electric brake system according to claim 1, wherein the inlet valve of the wheel where the largest target pressure among two or more different target pressures is requested is fully opened by sending the current to zero. Claim 3 delete Claim 4 A method for controlling different target pressures for each wheel of an integrated electric brake system, wherein the hardware test performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve. Claim 5 delete Claim 6 When two or more different target pressures are requested from individual wheels and there is a request for pressurization to a wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of the inlet valve of each individual wheel to be controlled is adjusted by the control of an electronic control unit to apply pressure simultaneously; the electronic control unit controls the inlet valve of the wheel to which the largest target pressure is requested among the two or more different target pressures from individual wheels to fully open and perform circuit pressure feedback control; a current capable of maintaining the difference between the circuit pressure and the target pressure of each remaining wheel is transmitted to the inlet valves of each wheel excluding the wheel to which the largest target pressure is requested, and the current capable of maintaining the difference between the circuit pressure and the target pressure of each remaining wheel is extracted through a predetermined hardware test, wherein the hardware test is performed by applying an arbitrary current to each of the inlet valves of each remaining wheel and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valve of each wheel opens, characterized by different target pressure control for each wheel of an integrated electric brake system. method. Claim 7 delete Claim 8 A method for controlling different target pressures for each wheel of an integrated electric brake system, wherein the hardware test performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve. Claim 9 delete Claim 10 The electronic control unit controls the inlet valve of the wheel for which the largest target pressure is requested among two or more different target pressures in individual wheels to fully open the inlet valve to perform circuit pressure feedback control, and transmits a current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels, excluding the wheel for which the largest target pressure is requested, to the inlet valves of each of the remaining wheels; if two or more different target pressures are requested in individual wheels and there is a request for pressurization to the wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of the inlet valves of each of the individual wheels to be controlled is adjusted by the control of the electronic control unit to apply pressurization simultaneously, and the current capable of maintaining the difference between the circuit pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test, wherein the hardware test is performed by applying an arbitrary current to each of the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valves of each wheel are opened, characterized by different target pressure control for each wheel of an integrated electric brake system. method. Claim 11 A method for controlling different target pressures for each wheel of an integrated electric brake system, wherein the hardware test performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve. Claim 12 delete Claim 13 A method for controlling different target pressures for each wheel of an integrated electric brake system, characterized in that, when controlling to apply different target pressures to each wheel, the current of the inlet valve of each wheel to be pressurized is adjusted to pressurize each wheel simultaneously, and a current capable of maintaining the difference between the circuit pressure and the target pressure of each wheel is transmitted to the inlet valves of each wheel other than the wheel for which the largest target pressure is requested, and the current capable of maintaining the difference between the circuit pressure and the target pressure of each wheel is extracted through a predetermined hardware test, wherein the hardware test is performed by applying an arbitrary current to each of the inlet valves of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valves of each wheel open. Claim 14 A method for controlling different target pressures per wheel of an integrated electric brake system, wherein, in claim 13, the electronic control unit controls the inlet valve of the wheel where the largest target pressure among two or more different target pressures is requested to fully open to perform circuit pressure feedback control. Claim 15 delete Claim 16 A method for controlling different target pressures for each wheel of an integrated electric brake system, wherein the hardware test performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve. Claim 17 delete Claim 18 An integrated electric brake system comprising a master cylinder that receives pedal force and generates hydraulic pressure, a pedal simulator that provides a reaction force according to the displacement of the pedal, a pressure generating unit including a pump for supplying oil to the master cylinder and a motor connected to the pump, a valve block equipped with a plurality of valves for opening and closing the flow of the oil, and an electronic control unit that controls the motor of the pressure generating unit and the plurality of valves of the valve block, wherein if two or more different target pressures are requested from individual wheels and there is a request for pressurization to a wheel to be controlled, and the target pressure of the wheel to be controlled is not the highest, the current of the inlet valves of each wheel to be controlled is adjusted by the control of the electronic control unit to apply pressure simultaneously, and the electronic control unit controls the inlet valve of the wheel to which the largest target pressure is requested among the two or more different target pressures from individual wheels to fully open the inlet valve to perform circuit pressure feedback control, and transmits a current capable of maintaining the difference between the circuit pressure and the target pressures of each of the remaining wheels, excluding the wheel to which the largest target pressure is requested, and the circuit An integrated electric brake system characterized in that a current capable of maintaining the difference between the pressure and the target pressure of each of the remaining wheels is extracted through a predetermined hardware test, wherein the hardware test is performed by applying an arbitrary current to the inlet valve of each of the remaining wheels and gradually increasing the circuit pressure to find the difference between the circuit pressure and the pressure of each wheel at the point when the inlet valve of each wheel opens. Claim 19 delete Claim 20 An integrated electric brake system according to claim 18, wherein the hardware test performs synchronous control based on the difference between the circuit pressure and the target pressure of each of the remaining wheels and the characteristics of each inlet valve.

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