KR100994109B1 - Device for exterior controlling oil pump for hybrid vehicle - Google Patents

Abstract

The present invention relates to an external oil pump control apparatus for a hybrid vehicle, and more particularly, is connected to a transmission to control the external oil pump under predetermined conditions according to a shift signal, and to turn on / off of the external oil pump according to engine RPM. By using a motor driver incorporating a gate driver for driving a three-phase full bridge circuit composed of FET elements, and constructing a motor driver using an N-channel MOSFET, an external oil pump controller for a hybrid vehicle having various control conditions can be obtained. It is to provide.

The technical configuration includes a power supply unit for removing noise and outputting a voltage suitable for each driving element when the battery power of the vehicle is applied; Central processing that receives the engine RPM of the vehicle from the transmission and outputs the target RPM of the external oil pump driving motor as a PWM signal according to the stored conditions, and receives the actual RPM of the motor as a feedback signal and performs PID control on errors. Device; A motor controller configured to transfer the actual RPM of the motor to the CPU and drive the motor by combining a PWM control signal and a switching signal output from the CPU; a FET device using a switching signal of the motor controller; A motor driver to turn on a gate of the motor controller to transmit a PWM signal of the motor controller to the motor; And a hall sensor configured to detect a rotor position of the motor, detect a speed of the motor, and output the detected speed to the motor controller.

Hybrid, External, Electric, Oil Pump, Electric Motor, Control

Description

External oil pump control device for hybrid vehicle {DEVICE FOR EXTERIOR CONTROLLING OIL PUMP FOR HYBRID VEHICLE}

The present invention relates to an external oil pump control device for a hybrid vehicle, which is mounted outside the transmission for a hybrid vehicle in which a control can be performed to minimize errors according to various vehicle conditions by using PWM signals, feedback signals, and PID control of the transmission. An external oil pump control apparatus.

In general, a hybrid electric vehicle reduces fuel consumption and harmful gas emissions compared to a conventional vehicle by simultaneously installing an internal combustion engine and a battery engine of an electric vehicle, or minimizing air resistance by dramatically reducing the weight of the vehicle body. It is the next generation vehicle which drastically reduced.

And, it means to drive the vehicle by combining two or more different power sources efficiently, and in most cases refers to the vehicle to obtain the driving force by the engine and the electric motor driven by the battery power using the fuel.

In response to the recent demand for improving fuel economy and developing more eco-friendly products, research on hybrid cars is being actively conducted. Hybrid vehicles can form various structures using engines and electric motors as power sources. Hybrid cars, which have been studied up to now, employ either parallel or series engines and electric motors.

On the other hand, the oil pump (Oil Pump) is provided to supply the necessary hydraulic fluid to the engine clutch and the transmission provided between the engine and the electric motor, which is due to the heat generated in the explosion stroke of the engine cylinder, piston, crankshaft bearing, camshaft The hydraulic oil is supplied to the bearings and the like.

At this time, the motor controller (MCU) calculates the target rotational speed according to the driving state and the driver operation state, and controls the oil pump driving motor according to the target rotational speed, thereby supplying the operating oil required for the engine clutch and the transmission. .

Here, in addition to the oil pump provided in the transmission, the hybrid vehicle is further provided with an external oil pump connected to the engine clutch so as to supply a sufficient amount of hydraulic oil to the engine clutch and the transmission.

However, the conventional oil pump is controlled at a low speed and a high speed in consideration of the system efficiency and driving responsiveness according to the driving state of the vehicle and the driver's operating state. However, in the hybrid vehicle, the external oil pump controller and control method are not provided. This is necessary.

The present invention has been made to solve the above problems, by setting various control conditions of the external oil pump applied to the hybrid vehicle, to provide an external oil pump control apparatus for a hybrid vehicle in which a driving error is minimized to approach the control target value. It aims to do it.

Another object of the present invention is to provide an external oil pump control device for a hybrid vehicle that can improve the response and accuracy by directly controlling the power supply voltage in a PWM manner while simplifying the control line. have.

Still another object of the present invention is to provide a diagnostic equipment for diagnosing overcurrent, overvoltage, short circuit / opening of the motor, etc., thereby increasing the life of each component and minimizing after-sales cost of the hybrid vehicle. To provide a control device.

In order to achieve the above object, the present invention provides a power supply unit for removing noise and outputting a voltage for each driving element, when the battery power of the vehicle is applied; Central processing that receives the engine RPM of the vehicle from the transmission and outputs the target RPM of the external oil pump driving motor as a PWM signal according to the stored conditions, and receives the actual RPM of the motor as a feedback signal and performs PID control on errors. Device; A motor controller configured to transfer the actual RPM of the motor to the CPU and drive the motor by combining a PWM control signal and a switching signal output from the CPU; a FET device using a switching signal of the motor controller; A motor driver to turn on a gate of the motor controller to transmit a PWM signal of the motor controller to the motor; And a hall sensor configured to detect a rotor position of the motor, detect a speed of the motor, and output the detected speed to the motor controller.

In addition, the current applied to the motor is measured and output to the motor controller through the motor driver, and when the current measured in comparison with the reference current in the motor controller is an overcurrent, an overcurrent according to the gate driving signal and a clock signal. It characterized in that it further comprises an overcurrent protection unit configured to flow to the classifier.

In addition, when the overcurrent flowing from the motor controller to the motor is detected by the overcurrent protection unit, the motor controller further includes an overvoltage protection unit for converting an analog signal for the overcurrent into a digital signal and outputting the feedback signal to the central processing unit. Characterized in that.

The motor is a three-phase brushless motor (BLDC) with a sensor, the motor driver is a three-phase full bridge circuit composed of N-channel MOSFETs, and the motor controller is a device having a built-in gate driver for driving the FET device. It is characterized by that.

In addition, the power supply unit outputs the power of 12V and 5V by using a DC-DC converter, the power of 12V is applied to the motor controller, the motor driving unit, the power of 5V to the central processing unit and the hall sensor It is characterized in that each is applied.

The pre-stored condition of the central processing unit receives the engine RPM as a PWM signal from the transmission, and when the engine RPM increases, when the engine RPM exceeds 2000 RPM, the external oil pump is turned off and the engine RPM decreases. If the engine RPM is less than 1800 RPM, it characterized in that the hysteresis control to turn on the external oil pump.

In addition, the pre-stored condition of the central processing unit receives an oil pump state and a transmission command signal built in the transmission, respectively, and when the vehicle starts, the motor is driven at 2000 RPM, and the motor is 1000 RPM at idle. When the vehicle is driven or idling with an electric motor of the hybrid engine, characterized in that for driving the motor at 1500RPM.

The CPU may determine that the three-phase line of the motor is open or shorted when an error between the target RPM and the actual RPM of the motor is 30% or more.

As described above, since the present invention having the configuration as described above directly drives the external oil pump driving motor by directly switching the power supply voltage of the vehicle, it can be precisely controlled with improved response to the set rotation speed, As it is applicable to the reliable BLDC motor as a standard, it can be applied regardless of the size and capacity of the motor applied, and thus can be used as a basic platform for an external oil pump driving motor. It is possible to reduce productivity and shorten the development period, thereby increasing productivity.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing an external oil pump control apparatus for a hybrid vehicle according to the present invention. As shown in FIG. 1, the external oil pump control apparatus 1 for a hybrid vehicle according to the present invention includes a power supply unit 10, a central processing unit 20, a motor controller 30, a motor driving unit 40, and an overvoltage protection unit. 50, an overcurrent protection unit 60, and a hall sensor 70.

Here, the power supply unit 10 is connected to the battery of the vehicle, when the ignition key input is generated, the power is supplied from the battery to remove noise and disturbance signals with a noise filter (not shown), DC-DC transformer (DC- DC converters (not shown) are used to output voltages of 12V and 5V, respectively.

In addition, the voltage of 12V is applied to the motor controller 30 and the motor driver 40 driven by the 12V power supply, the voltage of 5V is the central processing unit 20, the Hall sensor 70, the overcurrent protection is driven by the 5V power supply The limiting current reference value providing unit (not shown) of the unit 60 is applied to each.

In addition, the central processing unit 20 is a power source having a respective voltage from the power supply unit 10 is applied to each element, when the transmission signal from the first stage to the fifth stage output from the TCU (Transmission Control Unit) as a PWM signal and The state of the main oil pump is received as a digital signal.

In addition, the control logic stored in the central processing unit 20 calculates the rotation speed of the external oil pump driving motor (M, hereinafter referred to as a motor) according to the shift signal and the state of the main oil pump. Transfer to the motor controller 30 to drive the motor (M).

In addition, the motor controller 40 in the motor controller 40 through the Hall sensor 70 to the current rotation speed of the motor (M) feedback signal so that the motor (M) rotates at the target speed in the central processing unit (20) When receiving, the motor controller 40 adds the rotation speed to the taco signal and feeds it back to the central processing unit 20.

Then, the central processing unit 20 performs feedback control through PID (Proportional Integral Derivative) control so that the current rotational speed of the motor (M) can reach the target rotational speed.

Here, PID control is a kind of feedback control that allows the output of the system to maintain the reference voltage based on the error between the control variable and the reference input, and P control (proportional) is proportional to the error signal between the reference signal and the current signal. The control signal is multiplied by a constant gain to produce a control signal. The I control (proportional integral) uses an integral control in parallel to the proportional control that integrates the error signal to create a control signal, and the D control (proportional derivative) differentiates the error signal. It is a control method that connects the derivative control to make the control signal in parallel with the proportional control.

Therefore, the central processing unit 20 performs feedback control so that the motor M reaches the target rotational speed by using the PWM duty (Duty,%) calculated to be increased or decreased through the PID control. Accurate control is possible, and the PID control equation will be described below.

The motor controller 30 is provided to transmit a control signal of the motor M received as a PWM signal from the central processing unit 20 to the motor M through the motor driver 40.

That is, in order to rotate the rotor of the motor M, the motor controller 30 detects the position of the rotor in the hall sensor 70 and generates an appropriate switching signal. The switching signal and the The PWM signal output from the central processing unit 20 is mixed and output to the motor driver 40.

The motor driver 40 is a switching circuit provided to output or interrupt the PWM signal, and is configured as a three-phase full-bridge circuit to drive a three-phase brushless motor (BLDC) with a sensor. The bridge circuit is composed of FET devices.

In addition, an N-channel MOSFET is used for both the high side and the low side of the three-phase full bridge circuit because the motor controller 30 turns on / turns the FET device. Since the device is integrated with the gate driver to turn off, the P / N channel MOSFET is not applied due to the application of the device, and only the N channel MOSFET is used.

Here, in order to drive an N-channel MOSFET, the motor controller 30 is configured to include a charge pump together with the gate driver to improve reliability.

Therefore, the PWM signal output from the CPU 20 is transmitted to the motor M by the switching signal of the motor driver 40 output from the motor controller 30, and the motor M is 3. It rotates to reach the target rotation speed through the phase (U, V, W) line.

At this time, when the PWM signal is applied, the hall sensor 70 outputs the position information of the motor M rotor to the motor controller 30, and the motor controller 30 controls the FET device of the motor driver 40. It is provided to turn on to drive the motor (M).

In addition, the hall sensor 70 detects the number of revolutions and the speed at which the motor M is driven and is input to the central processing unit 20 through the motor controller 30, and the current of the motor M input as a feedback signal. The speed is used for PID control to approach the target speed.

The overcurrent protection unit 60 detects the current applied to the motor M with the classifier SHUNT connected to the motor driving unit 40, and outputs a signal and a motor output from a circuit (not shown) that provides a limit current reference value. The current applied to (M) is output to the motor controller 30.

In this case, the motor controller 30 compares the current current value and the limit current reference value of the motor M detected by the classifier and outputs a diagnostic signal to the motor controller 30, which will be described in detail below.

In addition, the overvoltage protection unit 50 transmits the overcurrent value diagnosed by the motor controller 30 to the central processing unit 20 in the form of digital data through A / D conversion, and in the central processing unit 20 the motor It is judged whether or not the voltage applied to (M) is an overvoltage, and when overvoltage is applied, control such as turning off the motor driver 40 is performed.

Accordingly, the external oil pump control apparatus 1 for a hybrid vehicle according to the present invention does not include a gate driver for switching the motor driver 40 made of a FET element, and integrates the motor driver 40 by integrating the motor controller 30. The high side and low side of the N-channel MOSFET are provided by the N-channel MOSFET, so that the size and volume thereof can be reduced, and the control speed is increased.

FIG. 2 is a graph illustrating a speed control signal according to a vehicle state of an external oil pump control apparatus for a hybrid vehicle according to the present invention, and will be described with reference to FIG. 1. As shown in FIG. 2, the external oil pump control device 1 for a hybrid vehicle is configured to drive a motor M driving the external oil pump for a vehicle at 2000 RPM for initial hydraulic formation after the vehicle is started. do.

That is, in the central processing unit 20, when the vehicle is started and no hydraulic pressure is formed in the external oil pump for the hybrid vehicle, the initial pressure is generated by rotating the motor M at a high speed.

In addition, when the engine starts to rotate and the speed is 0, idling is called idling. During this idling, the external oil pump for the hybrid vehicle performs only minimal driving. Therefore, the external oil pump for the hybrid vehicle when the vehicle is idling. The driving motor M is driven at 1000 RPM.

When the vehicle is being operated by an electric motor which is one of the hybrid vehicle engines, or when the vehicle is in the idling state by the electric motor, the external oil pump driving motor M for the hybrid vehicle is driven at 1500 RPM.

In the present invention, the external oil pump driving motor M is driven at 1000 RPM, and the external oil pump driving motor M is driven at 1500 RPM. The second oil pump driving motor M is driven at 1000 RPM. It is shown in the graph to define that the M) is driven at 2000 RPM three stages, it is shown in Table 1 below.

division Input (PWM) Output (RPM)
Driving speed MIN 0 1000 RPM 1000 ± 10% 1500 RPM 1500 ± 10% 2000 RPM 2000 ± 10% MAX -

As shown in Table 1, when the PWM signal input to the motor M is the minimum value, the motor M does not rotate, and when the PWM signal input to the motor M is 1000 RPM, the motor M The output power of is driven at 1000 RPM with a 10% tolerance. The same applies to 1500 RPM and 2000 RPM.

3 is a hysteresis curve showing an external oil pump on / off condition according to the engine RPM of the external oil pump control apparatus for a hybrid vehicle according to the present invention. As shown in FIG. 3, when the engine RPM exceeds 2000 RPM in a state where the RPM of the hybrid engine is increased, the engine oil is connected to the main oil pump and the engine clutch to stop driving of the external oil pump provided at the outside of the transmission. It is only driven by the main oil pump.

The reason is that when the initial hydraulic pressure is formed, the external oil pump is used to increase the flow rate of the oil. However, since the hydraulic pressure is formed to some extent in the state where the engine RPM is increasing, it is preferable to operate only the main oil pump. Because.

Therefore, when the engine RPM increases, when the engine RPM exceeds 2000 RPM, the operation of the external oil pump is stopped.

In addition, when the engine RPM of the vehicle decreases and the engine RPM enters 1800 RPM, the external oil pump which is stopped is started to be driven.

4 is a diagram illustrating PID control of an external oil pump control apparatus for a hybrid vehicle according to the present invention, which will be described with reference to FIG. 1. As shown in FIG. 4, when the rotation speed (actual value) of the motor M input through the hall sensor 70 and the motor controller 30 is received from the central processing unit 20, It compares with the target rotation speed (reference value) of the motor M output from the processing apparatus 20. FIG.

That is, in the central processing unit 20 according to the external oil pump on / off condition according to the rotational speed of the external oil pump driving motor M for each vehicle condition condition described in FIGS. 2 and 3 and the engine RPM for the hybrid vehicle. The motor controller 30 transmits the switching signal from the motor controller 30 by turning on the FET device of the motor driving unit 40 to the motor M, and then drives the motor M accordingly. The actual rotation speed is measured using the hall sensor 70, and the measured rotation speed of the motor M is input to the central processing unit 20 through the motor controller 30 to perform the PID control as described above. .

Therefore, the difference between the target rotational speed (reference value) and the actual rotational speed (actual value), that is, the error as the input value E (n) of the PID control, is proportional gain K _P , integral gain K _I , and derivative. The gains K _D are respectively calculated to calculate an output value Y (n) for error correction.

Through this, the PWM signal having the duty (%) is input to the motor (M) when the motor driving unit 40 is turned on again by the switching signal 30 of the motor controller 30, the equation for the PID control is Equation 1 below.

Here, the central processing unit 20 determines that the three-phase line of the motor (M) is open or shorted when the central processing unit has an error between the target RPM and the actual RPM of the motor (M) of 30% or more. It includes more.

5 is a graph illustrating an overcurrent protection unit and a DC current according to the overcurrent protection unit of the external oil pump control apparatus for a hybrid vehicle according to the present invention. As illustrated in FIG. 5, the overcurrent protection unit 61 may measure the current applied to the motor M using the classifier SHUNT 61.

That is, after measuring the current applied through the motor driver 40 made of the FET element, and sends it to the motor controller 30, the reference value from the circuit 63 for providing the current limit reference value is also sent to the motor controller 30. The motor controller 30 compares the current measured value with the current reference value.

Then, if the DC current exceeds the reference value output from the circuit 63 providing the current limit reference value, it is allowed to flow to the classifier SHUNT.

In the graph, when the current limit value is 45 [A] and the DC current exceeds the current limit value, current flows to the classifier 61 according to the MOSFET gate drive signal and the CLOCK signal of the motor driver 40 so that the current flows. It can be seen that the limit value is not exceeded.

Therefore, as the external oil pump driving motor M according to the present invention, the overcurrent is not applied by the overcurrent protection unit 60, and thus damage to the motor M due to the overcurrent is minimized.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited only to this specific embodiment, and those skilled in the art within the scope of the claims of the present invention Changes may be made as appropriate.

1 is a block diagram schematically showing an external oil pump control apparatus for a hybrid vehicle according to the present invention;

Figure 2 is a graph showing a speed control signal according to the vehicle state of the external oil pump control apparatus for a hybrid vehicle according to the present invention.

Figure 3 is a hysteresis curve showing the external oil pump on / off conditions according to the engine RPM of the external oil pump control apparatus for a hybrid vehicle according to the present invention.

4 is a diagram illustrating PID control of an external oil pump control apparatus for a hybrid vehicle according to the present invention.

FIG. 5 is a graph illustrating an overcurrent protection unit and a DC current according to the overcurrent protection unit of the external oil pump control apparatus for a hybrid vehicle according to the present invention. FIG.

<Brief description of reference numerals for the main parts of the drawings>

1: External oil pump controller for hybrid vehicle

10: power supply unit 20: central processing unit

30: motor controller 40: motor drive unit

50: overvoltage protection unit 60: overcurrent protection unit

70: Hall sensor

Claims (9)

When the battery power of the vehicle is applied, the power supply unit for removing noise and outputting a voltage for each driving element respectively; Central processing that receives the engine RPM of the vehicle from the transmission and outputs the target RPM of the external oil pump driving motor as a PWM signal according to the stored conditions, and receives the actual RPM of the motor as a feedback signal and performs PID control on errors. Device; A motor controller for transmitting the actual RPM of the motor to the central processing unit as a feedback signal and driving the motor by combining a PWM control signal and a switching signal output from the central processing unit; A motor driver for turning on the gate of the FET device as a switching signal of the motor controller to transfer the PWM signal of the motor controller to the motor; A hall sensor configured to detect a rotor position of the motor, detect a speed of the motor, and output the detected speed to the motor controller; The motor is a three-phase brushless motor (BLDC) with a sensor, The motor driver is a three-phase full bridge circuit composed of N-channel MOSFET, The motor controller is a device with a built-in gate driver for driving the FET device, The central processing unit receives an oil pump state and a transmission command signal built in the transmission, respectively, and when the vehicle is started, the motor is driven at 2000 RPM, and when the vehicle's hybrid engine rotates at zero idle speed. And driving the motor at 1000 RPM and driving the motor at 1500 RPM when the vehicle is driven by an electric motor or when the vehicle is idling while driving with the electric motor. The method according to claim 1, The current applied to the motor is measured and output to the motor controller through the motor driver, and when the current measured in comparison with the reference current in the motor controller is an overcurrent, the overcurrent is classified according to the gate driving signal and the clock signal. Overcurrent protection configured to flow External oil pump control apparatus for a hybrid vehicle further comprising a. The method according to claim 2, When the overcurrent flowing from the motor controller to the motor is detected by the overcurrent protection unit, the motor controller converts the analog signal for the overcurrent into a digital signal and outputs a feedback signal to the central processing unit. External oil pump control apparatus for a hybrid vehicle further comprising a. delete The method according to claim 1, The power supply unit outputs a first power source and a second power source using a DC-DC transformer, and the first power source is applied to the motor controller and the motor driving unit, and the second power source is supplied to the central processing unit and the hall sensor. External oil pump control device for a hybrid vehicle, characterized in that each applied. The method according to claim 1, The central processing unit receives the engine RPM as a PWM signal from the transmission, and turns off the external oil pump when the received engine RPM increases above 2000 RPM, and the external oil pump when the received engine RPM decreases below 1800 RPM. External oil pump control device for a hybrid vehicle, characterized in that for performing hysteresis control to turn on. delete The method according to any one of claims 1 to 3, 5 and 6, The central processing unit calculates the output value (Y (n)) of the error between the target RPM and the actual RPM of the motor as the input value (E (n)), PID control formula for the error is characterized in that External oil pump controller for hybrid vehicles.

Proportional Gain (K _P ), Integral Gain (K _I ), Derivative Gain (K _D ) The method according to claim 8, The central processing unit is an external oil pump control device for a hybrid vehicle, characterized in that it is determined that the three-phase line of the motor is open or short when the error of the target RPM and the actual RPM of the motor is more than 30%.

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