Apparatus for controlling electric oil pump of automatic transmission and method thereof

Abstract

The present invention discloses an electric oil pump control device for an automatic transmission and a method thereof. The electric oil pump control device for an automatic transmission according to the present invention comprises: a drive motor for driving an oil pump; a current sensing module for detecting a drive current applied to the drive motor; a rotational speed sensing module for detecting the rotational speed of the drive motor; a memory; and a processor operatively coupled to the drive motor, the current sensing module, the rotational speed sensing module, and the memory; wherein the processor applies a drive current to the drive motor according to a target rotational speed input from an upper control unit to operate the drive motor and feeds back the rotational speed detected through the rotational speed sensing module, and when the drive current detected through the current sensing module exceeds a set current, the drive motor is stopped and operated repeatedly.

Description

Technology Field

[0001] The present invention relates to an electric oil pump control device and method for an automatic transmission, and more specifically, to an electric oil pump control device and method for an automatic transmission characterized by driving the oil pump by repeatedly turning it on and off to remove foreign matter when it is determined that the oil pump is stuck due to foreign matter based on a change in the driving current of the electric oil pump. Background Technology

[0002] With global oil prices and increasingly stringent exhaust emission regulations, automakers are pouring all their efforts into developing technologies to improve fuel efficiency as part of their eco-friendly initiatives.

[0003] In particular, fuel efficiency improvement in the transmission can be achieved through the enhancement of power transmission efficiency, and this enhancement in power transmission efficiency can be realized by minimizing unnecessary power consumption of the oil pump.

[0004] Therefore, as a result of applying a start clutch instead of a torque converter to double clutch transmissions (DCT) or automatic transmissions (AT), measures are being pursued to minimize power loss by using an electric oil pump instead of a mechanical oil pump and adjusting the pump's RPM to match the required flow rate.

[0005] In other words, an electric oil pump is used to efficiently manage the hydraulic pressure supplied as control oil (friction components such as clutches and brakes that operate selectively during gear shifting) and lubricating oil (cooling and lubrication).

[0006] The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-1509691 (published April 7, 2015, electric oil pump control device and method for automatic transmission). The problem to be solved

[0007] In this way, to generate hydraulic pressure in an electric oil pump, a method of driving the pump using a motor is employed, and the required flow rate is generated by driving the pump by adjusting the motor's RPM (revolutions per minute), thereby creating pressure in the transmission.

[0008] However, if foreign matter gets stuck in the oil pump, a pump stoppage occurs due to the blockage, resulting in a problem where lubrication and control pressure are not formed in the transmission, making vehicle operation impossible.

[0009] The present invention has been devised to improve upon the aforementioned problems, and the objective of the present invention according to one aspect is to provide an electric oil pump control device and method for an automatic transmission, characterized by driving the oil pump by repeatedly turning it on and off to remove foreign matter when it is determined that the oil pump is stuck due to foreign matter based on a change in the driving current of the electric oil pump. means of solving the problem

[0010] An electric oil pump control device for an automatic transmission according to one aspect of the present invention comprises: a drive motor for driving an oil pump; a current sensing module for detecting a drive current applied to the drive motor; a rotational speed sensing module for detecting the rotational speed of the drive motor; a memory; and a processor operatively coupled to the drive motor, the current sensing module, the rotational speed sensing module, and the memory; wherein the processor applies a drive current to the drive motor according to a target rotational speed input from an upper control unit to operate the drive motor and feeds back the rotational speed detected through the rotational speed sensing module, and when the drive current detected through the current sensing module exceeds a set current, the drive motor is stopped and operated repeatedly.

[0011] In the present invention, the processor is characterized by repeating the stopping and operating of the drive motor after waiting for a set time.

[0012] In the present invention, the processor is characterized by operating at a set operating current when operating the drive motor after stopping it.

[0013] In the present invention, the processor is characterized by feeding back the rotational speed detected through the rotational speed detection module to the upper control unit.

[0014] A method for controlling an electric oil pump of an automatic transmission according to another aspect of the present invention comprises: a step in which a processor receives a target rotational speed from an upper control unit; a step in which the processor applies a driving current to a driving motor according to the target rotational speed and operates the driving motor; a step in which the processor receives a detection result of detecting the driving current applied to the driving motor and the rotational speed of the driving motor; a step in which the processor compares the driving current with a set current to determine whether the driving current exceeds the set current; and a step in which the processor stops the operation of the driving motor and then operates the driving motor when the determination result indicates that the driving current exceeds the set current.

[0015] The present invention is characterized by further including the step of a processor receiving a detection result of detecting the rotational speed and feeding it back to an upper control unit.

[0016] In the present invention, the step of repeating the step of stopping the operation of the drive motor and then operating the drive motor is characterized by the processor stopping the operation of the drive motor, waiting for a set time, and then operating the drive motor.

[0017] In the present invention, the step of repeating the step of operating the drive motor after stopping the operation of the drive motor is characterized by the processor operating the drive motor with a set operating current when operating the drive motor after waiting for a set time. Effects of the invention

[0018] An electric oil pump control device and method for an automatic transmission according to one aspect of the present invention can improve the starting performance of an oil pump and reduce the failure rate by driving the oil pump to a normal state by repeatedly turning it on and off when it is determined to be stuck due to foreign matter based on a change in the driving current of the electric oil pump, thereby removing the foreign matter. Brief explanation of the drawing

[0019] FIG. 1 is a block diagram showing an electric oil pump control device of an automatic transmission according to one embodiment of the present invention. FIG. 2 is a flowchart illustrating a method for controlling an electric oil pump of an automatic transmission according to an embodiment of the present invention. Specific details for implementing the invention

[0020] Hereinafter, an electric oil pump control device for an automatic transmission and a method thereof according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0021] FIG. 1 is a block diagram showing an electric oil pump control device of an automatic transmission according to one embodiment of the present invention.

[0022] As illustrated in FIG. 1, an electric oil pump control device of an automatic transmission according to one embodiment of the present invention may include a drive motor (60), a current sensing module (20), a rotational speed sensing module (30), a memory (40), and a processor (50).

[0023] The drive motor (60) can generate hydraulic pressure by driving an oil pump (70) supplied with oil for control of the automatic transmission (friction members such as clutches and brakes that are selectively operated during shifting) and oil for lubrication (cooling, lubrication).

[0024] The current detection module (20) can detect the driving current applied to the driving motor (60) and determine an abnormal state.

[0025] The rotational speed detection module (30) can detect the rotational speed of the drive motor (60) and provide feedback control to reach the target rotational speed.

[0026] The memory (40) stores a control program by the electric oil pump control device of the automatic transmission and can store an algorithm related to the operation of the electric oil pump control device of the automatic transmission, and the stored information can be selected by the processor (50) as needed.

[0027] That is, various types of data generated during the execution of an operating system or application (program or applet) for driving the electric oil pump control device of an automatic transmission are stored in the memory (40). At this time, the memory (40) can be implemented as non-volatile memory, volatile memory, flash memory, hard disk drive (HDD), or solid-state drive (SSD). Additionally, data reading / writing / modification / deletion / updating by the processor (50) can be performed on the memory (40).

[0028] The processor (50) is operatively coupled to the drive motor (60), current sensing module (20), rotational speed sensing module (30) and memory (40) to control the overall operation of the electric oil pump control device of the automatic transmission, and can perform various operations by copying various programs stored in memory (40) to RAM and executing them.

[0029] That is, the processor (50) can operate the drive motor (60) by applying a drive current according to the target rotational speed input from the upper control unit (10) by running an execution program stored in memory (40), and can drive the oil pump (70) according to the rotational speed by feeding back the rotational speed detected through the rotational speed detection module (30) to the upper control unit (10) to form the required flow rate and form the pressure of the transmission.

[0030] Additionally, the processor (50) can resolve foreign matter jamming by repeatedly stopping and operating the drive motor (60) when the drive current detected through the current detection module (20) abnormally exceeds the set current compared to the normal drive current.

[0031] At this time, the processor (50) can generate vibration repeatedly after waiting for a set time when the drive motor (60) is stopped and operated repeatedly, and thereby can eliminate foreign matter jamming.

[0032] In addition, when the drive motor (60) is stopped and then operated, the processor (50) operates the drive motor (60) at a set operating current and operates it strongly instantaneously, thereby pushing out foreign matter and effectively relieving foreign matter jamming.

[0033] As described above, according to the electric oil pump control device of an automatic transmission according to an embodiment of the present invention, when a jam caused by foreign matter is determined based on a change in the driving current of the electric oil pump, the oil pump is driven by repeatedly turning on and off to remove the foreign matter, thereby allowing it to be restored to a normal state, which improves the starting performance of the oil pump and reduces the failure rate.

[0034] FIG. 2 is a flowchart illustrating a method for controlling an electric oil pump of an automatic transmission according to an embodiment of the present invention.

[0035] As illustrated in FIG. 2, in the electric oil pump control method of an automatic transmission according to one embodiment of the present invention, first, a processor (50) runs an execution program stored in memory (40) and then receives a target rotational speed from an upper control device (10) (S10).

[0036] After receiving the target rotational speed in step S10, the processor (50) applies a driving current to the driving motor (60) according to the target rotational speed to operate the driving motor (60) (S20).

[0037] After operating the drive motor (60) in step S20, the processor (50) detects the drive current applied to the drive motor (60) and the rotational speed of the drive motor (60) through the current detection module (20) and the rotational speed detection module (30) (S30).

[0038] After detecting the driving current and rotational speed in step S30, the processor (50) determines whether the driving current abnormally exceeds the set current compared to the normal driving current (S40).

[0039] In step S40, if the driving current is determined to exceed the set current and does not exceed the set current, the processor (50) determines that it is in a normal state and feeds back the detected rotational speed to the upper control device (10) (S50).

[0040] On the other hand, in step S40, it is determined whether the driving current exceeds the set current, and if it exceeds the set current, the processor (50) stops the operation of the driving motor (60) and waits for a set time (S60).

[0041] After waiting for the set time in step S60, the processor (50) returns to the step (S20) of operating the drive motor (60) again and repeats.

[0042] In this way, when the driving current applied to the driving motor (60) exceeds the set current, the processor (50) can stop and operate the driving motor (60) repeatedly to remove foreign matter jamming.

[0043] At this time, the processor (50) can generate vibration repeatedly after waiting for a set time when the drive motor (60) is stopped and operated repeatedly, and thereby can eliminate foreign matter jamming.

[0044] In addition, when the drive motor (60) is stopped and then operated, the processor (50) operates the drive motor (60) at a set operating current and operates it strongly instantaneously, thereby pushing out foreign matter and effectively relieving foreign matter jamming.

[0045] As described above, according to the electric oil pump control method of an automatic transmission according to an embodiment of the present invention, when a jam caused by foreign matter is determined based on a change in the driving current of the electric oil pump, the oil pump is driven by repeatedly turning on and off to remove the foreign matter, thereby allowing it to recover to a normal state, which improves the starting performance of the oil pump and reduces the failure rate.

[0046] The implementations described herein may be implemented, for example, as methods or processes, devices, software programs, data streams, or signals. Even if discussed only in the context of a single form of implementation (e.g., discussed only as a method), the implementation of the discussed features may also be implemented in other forms (e.g., devices or programs). Devices may be implemented in appropriate hardware, software, and firmware, etc. Methods may be implemented in devices such as processors, which generally refer to processing devices including, for example, computers, microprocessors, integrated circuits, or programmable logic devices. Processors also include communication devices such as computers, cell phones, portable / personal digital assistants ("PDAs"), and other devices that facilitate the communication of information between end-users.

[0047] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0048] Therefore, the true technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0049] 10: Upper control unit 20: Current sensing module 30: Rotation speed detection module 40: Memory 50 : Processor 60 : Drive motor 70 : Oil pump

Claims

Claim 1 A drive motor for driving an oil pump; a current sensing module for detecting a drive current applied to the drive motor; a rotational speed sensing module for detecting the rotational speed of the drive motor; a memory; An electric oil pump control device for an automatic transmission comprising: a drive motor, a current sensing module, a rotational speed sensing module, and a processor operatively coupled to the memory; wherein the processor applies the drive current to the drive motor according to a target rotational speed input from an upper control unit to operate the drive motor and feeds back the rotational speed detected through the rotational speed sensing module, and if the drive current detected through the current sensing module exceeds a set current, determines that a stall has occurred and repeats the stopping and operating of the drive motor, and wherein, when repeating the stopping and operating of the drive motor, the processor stops the operation of the drive motor, waits for a set time, and then operates the drive motor, and when operating the drive motor after waiting for the set time, operates it strongly at a set operating current. Claim 2 delete Claim 3 delete Claim 4 An electric oil pump control device for an automatic transmission, wherein, in claim 1, the processor feeds back the rotational speed detected through the rotational speed detection module to the upper control device. Claim 5 A method for controlling an electric oil pump of an automatic transmission, comprising: a step in which a processor receives a target rotational speed from an upper control unit; a step in which the processor applies a driving current to a driving motor according to the target rotational speed to operate the driving motor; a step in which the processor receives a detection result of detecting the driving current applied to the driving motor and the rotational speed of the driving motor; a step in which the processor compares the driving current with a set current to determine whether the driving current exceeds the set current; and a step in which the processor determines that a stall has occurred when the determination result exceeds the set current, stops the operation of the driving motor, and then repeats the step of operating the driving motor; wherein the step of repeating the step of stopping the operation of the driving motor and then operating the driving motor is characterized in that the processor stops the operation of the driving motor, waits for a set time, and then operates the driving motor, and when operating the driving motor after waiting for the set time, operates it strongly with a set operating current. Claim 6 A method for controlling an electric oil pump of an automatic transmission, characterized in that, in claim 5, the processor receives a detection result in which the rotational speed is detected and feeds it back to the upper control unit. Claim 7 delete Claim 8 delete

Images