KR101199322B1 - Oil pump control apparatus for plug-in hybrid vehicle and self-discharge method thereof - Google Patents

Abstract

PURPOSE: An oil pump control device for a PHEV(Plug In Hybrid Electric Vehicle) and a self-discharge method thereof are provided to self-discharge the energy in inner circuit elements as a motor is forcibly operated for a predetermined time when an oil pump stops. CONSTITUTION: An oil pump control device(20) for a PHEV comprises a power supply unit(21), a motor driving unit(22), and a control unit(24). The power supply unit supplies driving power to an oil pump driving motor(11) by receiving power from a battery(13) and a high-voltage battery(12). The motor driving unit drives a motor by switching the driving power. The control unit forcibly drives the motor by the energy in inner circuit elements for pre-set power latching time when the motor stops. The latch(36) of the power supply unit is controlled with a low or high value according to the on/off state of an ignition key. [Reference numerals] (11) Motor; (12) High voltage battery; (13) Battery; (14) Main controller; (21) Power supply unit; (22) Motor driving unit; (23) Communication unit; (24) Control unit; (25) Memory; (32) EMC filter; (33) Current detecting unit; (34) Voltage conversion circuit; (35) Constant voltage regulator; (36) Latch

Description

OIL PUMP CONTROL APPARATUS FOR PLUG-IN HYBRID VEHICLE AND SELF-DISCHARGE METHOD THEREOF}

The present invention relates to an oil pump control apparatus for a plug-in hybrid vehicle and a self-discharge method thereof, and more particularly, to an oil pump control for a plug-in hybrid vehicle that controls driving of a motor by using energy stored in a circuit element when the oil pump stops driving. An apparatus and a self-discharge method thereof are provided.

In general, a hybrid electric vehicle refers to an efficient combination of two or more different power sources to drive a vehicle, and in most cases, an electric motor driven by an engine and a battery power that obtains driving power using fuel Refers to a vehicle that obtains a driving force.

In response to the recent demand for improving fuel economy and developing more eco-friendly products, research on hybrid vehicles is being actively conducted.

Accordingly, the capacity of the high voltage battery is made larger than that of the conventional hybrid vehicle, and the high voltage battery is charged from an external power source, and the vehicle is driven only in the electric vehicle (EV) mode, which is a pure electric vehicle mode when driving at a short distance. A plug-in hybrid electric vehicle (PHEV), which operates in a hybrid electric vehicle (HEV) mode, which is an auxiliary mode that uses the rotational power of the motor as an auxiliary power, is developed.

In other words, the plug-in hybrid vehicle is equipped with a gasoline-powered internal combustion engine and a battery engine at the same time as a conventional hybrid vehicle to drive the vehicle using either or both. As a vehicle that can be used, it can be used continuously because it can be charged at home or at a charging station, such as charging a cell phone or gasoline.

While conventional hybrids can only drive a few miles at low speeds on electricity alone, plug-in hybrids are being developed that can run up to 40 miles on a single charge.

In addition, the plug-in hybrid vehicle is connected to the high-speed CAN communication line around the HCU (Hybrid Control Unit), which is the upper control unit, to exchange information between the control units, and the upper control unit transmits commands to the lower controller.

The present applicant has disclosed and applied for an oil pump driving device for a plug-in hybrid vehicle in Korean Patent Application No. 10-2010-0016953 (filed February 25, 2010, hereinafter referred to as 'Patent Document 1').

The oil pump driving device (hereinafter referred to as 'oil pump driving device') for the plug-in hybrid vehicle according to Patent Document 1 continuously communicates with the upper control unit through the CAN communication line to provide a sufficient amount of hydraulic oil to the engine clutch and the transmission. CAN communication line and control due to high voltage noise by separating and configuring the high voltage part supplied with the high voltage part and the low voltage part applied with the low voltage from the battery to stably supply and to drive the motor receiving the high voltage from the high voltage battery. Prevent unit failure.

That is, the high voltage unit includes a gate driver, a three-phase full bridge circuit, an EMC filter, a current sensing unit, a high voltage unit voltage regulator, and an isolated DC / DC converter, and the low voltage unit includes a controller, a motor controller, a CAN transceiver, and a voltage conversion circuit. Include.

Therefore, the oil pump driving device according to Patent Document 1 can prevent the failure and damage of the control unit due to the high voltage noise can safely protect the entire system.

On the other hand, the coil (inductor) and the capacitor installed on the circuit board constituting the conventional plug-in hybrid vehicle oil pump driving device stores the energy according to the intrinsic capacitance, it is maintained without discharging the stored energy even if the driving power is cut off. .

Therefore, when the operator removes or combines a connector for connecting each component of the oil pump driving device for the inspection or repair of the plug-in hybrid vehicle, safety accidents such as electric shocks are often caused as the energy stored in the coil and the capacitor is discharged.

In particular, the oil pump driving apparatus of the conventional plug-in hybrid vehicle drives the motor using a high voltage battery to reduce power consumption of the hybrid vehicle.

Therefore, the oil pump driving apparatus of the conventional plug-in hybrid vehicle has a problem in that an accident risk due to electric shock increases due to an increase in the discharged voltage as the high voltage of the high voltage battery is stored in the coil and the capacitor installed on the circuit board.

Republic of Korea Patent Application No. 10-2010-0016953 (filed February 25, 2010)

The present invention is to solve the problems as described above, an object of the present invention is to plug-in hybrid vehicle oil pump control device for discharging the energy stored in the circuit elements installed on the circuit board of the oil pump control device when the plug-in hybrid vehicle driving end and It is to provide a self discharge method thereof.

Another object of the present invention is to provide an oil pump control apparatus for a plug-in hybrid vehicle and a self-discharging method thereof, forcibly driving an oil pump driving motor at the end of driving of the oil pump.

According to a feature of the present invention for achieving the above object, the present invention is a power supply for supplying the driving power to the motor for driving the oil pump by receiving the supply power from the high voltage battery and the battery, by switching the drive power to the motor And a controller for controlling the motor driving means to forcibly drive the motor by using energy stored in a circuit element during a predetermined power latch time when the driving of the motor is stopped. And a latch controlled to have a low or high value according to whether the key is on or off.

The power supply unit is a power relay assembly for blocking and connecting the flow of high voltage applied from a high voltage battery, an EMC filter for reducing the EMC noise included in the high voltage applied from the power relay assembly, applied to the motor driving means from the EMC filter Current sensing unit for sensing the current and transmitting the detection signal to the control unit, the voltage conversion circuit for converting the constant power and ignition key input power supplied from the battery from the low voltage unit power to the high voltage unit power and the constant power and ignition key input power It further comprises a constant voltage regulator for converting the voltage level.

The power latch time includes a filtering time for entering a power latch, a fault transceiving time for storing a freeze frame in a predetermined position of a memory, and a time for forcibly driving the motor, and the controller controls the filtering time and the fault translating time. And control the power relay assembly to cut off the high voltage applied to the motor driving means from the high voltage battery.

According to another feature of the invention, the present invention (a) the operation of the ignition key to stop the operation of the oil pump, (b) the ignition key is supplied from the battery during the ignition key off operation in step (a) Maintaining input power for a predetermined power latch time, (c) generating a control signal for driving an oil pump driving motor by using the ignition key input power supplied in step (b); (d) forcibly driving the motor to self-discharge energy stored in a circuit element inside the oil pump control apparatus based on the control signal generated in step (c).

In the step (d), after the motor is driven (d1), the high voltage inside the oil pump control device is compared with a preset reference voltage. (D2) As a result of the comparison in the step (d1), the oil pump control device is When the high voltage is equal to or greater than the reference voltage, comparing the time of forcibly driving the motor with a preset reference driving time; and (d3) the comparison result of the step (d1). Or, when the forced driving time of the motor exceeds the reference driving time as a result of the comparison in the step (d2), cutting off the supply of the ignition key input power.

The present invention further includes the step of (e) entering the power latch for a preset filtering time before forcibly driving the motor in step (d) and storing a freeze frame for a preset fault transit time. do.

The present invention further includes the step of (f) blocking, by the power relay assembly, the high voltage supplied from the high voltage battery before the filtering time and fault translating time have elapsed during the ignition key off operation.

As described above, the present invention self-discharges the energy stored in the circuit element inside the oil pump control device by driving the motor for a predetermined time when the oil pump driving stops.

In particular, the present invention terminates the driving of the motor when the high voltage inside the oil pump control device is lowered below the preset reference voltage or when the time when the motor is forcibly driven using the high voltage exceeds the preset reference driving time.

Accordingly, the present invention can prevent an electric shock due to energy stored in the oil pump control device when the operator installs or removes a power connector to repair or inspect the oil pump control device and the oil pump in the plug-in hybrid vehicle. .

As a result, the present invention has the effect of improving the workability by providing a working environment in which the worker can work safely.

1 is a block diagram of a plug-in hybrid vehicle oil pump control apparatus according to an embodiment of the present invention.
2 is a timing diagram showing an output signal of each device shown in FIG.
Figure 3 is a flow chart illustrating a step-by-step self-discharge method of the plug-in hybrid vehicle oil pump control apparatus according to an embodiment of the present invention.

Hereinafter, an oil pump control apparatus for a plug-in hybrid vehicle and a self discharge method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an oil pump control apparatus for a plug-in hybrid vehicle according to an exemplary embodiment of the present invention, and FIG. 2 is a timing diagram illustrating an output signal of each device shown in FIG. 1.

Plug-in hybrid vehicle oil pump control device (hereinafter referred to as "oil pump control device") 20 according to a preferred embodiment of the present invention, as shown in Figure 1, of the high voltage battery 12 and the battery 13 Power supply unit 21 for supplying driving power to the oil pump driving motor (hereinafter referred to as the motor) 11 by receiving the supply power, motor driving means for driving the motor 11 by switching the driving power (22), a communication unit 23 for receiving a control signal from the main control unit 14, and a control unit 24 for outputting a PWM control signal for controlling the driving of the motor driving means 22 based on the control signal. .

The motor 11 is a three-phase sensored BLDC motor with a built-in hall sensor (not shown) for detecting a change in the magnetic field according to the position of the rotor to sense the rotational speed of the motor 11.

Of course, the motor 11 may be changed to a three-phase sensorless type BLDC motor from which the hall sensor is removed.

The power supply unit 21 is a power relay assembly (hereinafter referred to as 'PRA') 31 which blocks and connects a high voltage flow applied from the high voltage battery 12 provided in the plug-in hybrid vehicle, and the PRA 31. EMC current is applied to the motor driving means 22 from the EMC filter 32 and the EMC filter 32 to reduce the electromagnetic noise (EMC) noise included in the high voltage applied by the control unit 24. The voltage sensing circuit 34 converts the constant current power supply and the ignition key input power supplied from the current sensing unit 33 and the battery 13 from the low voltage power supply to the high voltage power supply, and the constant power and ignition key input power. A constant voltage regulator 35 for converting the voltage level and a latch 36 for holding the ignition key input power for a predetermined time during the off operation of the ignition key are held.

The PRA 31 is a relay (not shown) that cuts off and connects power applied from the high voltage battery 12 under the control of the controller 24 performing CAN communication with a battery management system (BMS) (not shown). C).

The BMS stores characteristic test result data of the high voltage battery 12 in a ROM, and constantly measures current, voltage, and temperature of the high voltage battery 12 during charging and discharging, and compares the measured data with the stored data. Accordingly, the remaining capacity of the high voltage battery 12 and the life of the battery are calculated and provided to the main control unit 14 or the control unit 24.

The voltage conversion circuit 34 is a transformer (not shown) connected in series between the battery power source and the low voltage part base potential line, and a field effect transistor (FET) connected between the transformer and the low voltage part base potential line (not shown). ), A coil (not shown) connected in series to one end of the output side of the transformer and a plurality of capacitors (not shown) connected in parallel between both ends of the output side of the transformer, the rear end of the coil being a constant voltage regulator ( 35).

The latch 36 is controlled to have a low / high value according to whether the ignition key is turned on or off from the controller 24, and the voltage conversion circuit 34 and the constant voltage regulator 35 are controlled according to the controlled value. To the control pin value.

Thus, as shown in FIG. 2, even when the ignition key is turned off (T1) so that the supply of the ignition key input power V _IG is interrupted from the battery 13, the output signal LS of the latch 36 is a power latch. It remains on for the time T2.

The power latch time T2 is a time set by an experimental value to supply the ignition key input power V _IG of the battery 13, and is set to about 500 ms in this embodiment.

Accordingly, the voltage conversion circuit 34 converts the ignition key input power V _IG into a high voltage and applies it to the motor driving means 22, and the constant voltage regulator 35 converts the ignition key input power V _IG into a low voltage. It applies to the control part 24.

The motor driving means 22 switches the high voltage supplied from the high voltage battery 12 to drive the motor 11 based on the duty value of the PWM control signal applied from the motor driving part (not shown) and the control part 24. A motor controller (not shown) for outputting a motor driving signal and a FET driver (not shown) for outputting a switching signal to a switching element of the motor driving unit based on the motor driving signal.

The motor driver is a three-phase full bridge method using a field effect transistor (hereinafter, referred to as a 'FET') device, and switches supply power applied to the motor 11. do.

For example, the three-phase full bridge circuit constituting the motor driver is referred to as a P-channel metal oxide semiconductor FET (MOSFET) on the high side and the low side, respectively. Device) and an N-channel MOSFET device or an Insulated Gate Bipolar Transistor (IGBT) device.

The motor controller outputs a three-phase motor driving signal according to the duty value of the PWM control signal output from the controller 24.

The FET driving unit applies a switching signal according to the three-phase motor driving signal to the gate terminal of the FET device provided in the motor driving unit.

The communication unit 23 receives the temperature of the transmission oil from the main control unit 14, and transmits state information and failure occurrence information of the oil pump control device 20 output from the control unit 24 to the main control unit 14.

The communication unit 23 is provided with an interface such as a CAN transceiver for performing CAN communication with the main control unit 14 and / or a connection line directly connecting the main control unit 14 and the control unit 24 so that communication can be performed even when CAN communication is defective. Can be.

The control unit 24 stores a freeze frame in a predetermined region of the memory 25 during the power latch time T2 for keeping the latch 36 high when the ignition key is turned off. Control to drive the motor 11 to discharge the energy charged in the same circuit element.

In detail, as illustrated in FIG. 2, the power latch time T2 includes a filtering time T3 entering the power latch, a fault trancing (FT) time T4 storing a freeze frame, and Forcibly driving the motor for self-discharge (SD) includes the motor driving time (T5).

The controller 24 stops driving the motor 11 when the high voltage inside the oil pump control device 20 falls below the reference voltage or when the time for driving the motor 11 is greater than or equal to a preset reference driving time. The control unit 36 has a low value to cut off the low voltage supplied to the oil pump controller 20.

The reference voltage is a voltage value set by an experimental value to reduce the risk of an electric shock accident, and is set to about 60V in this embodiment.

The reference driving time is a minimum driving time for driving the motor 11 to release energy stored in the circuit element, which is set to about 200 ms in this embodiment.

Therefore, since the motor driving time T5 is 200ms, the control unit 24 controls the PRA 31 to cut off the high voltage within the filtering time T3 and the fault transducing time T4 after the ignition key is turned off (T1). do.

Next, a self-discharge method of an oil pump control apparatus for a plug-in hybrid vehicle according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating a self-discharge method of an oil pump control apparatus for a plug-in hybrid vehicle according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the self-discharging method of the plug-in hydride vehicle oil pump control apparatus according to the preferred embodiment of the present invention includes the constant power supply of the battery 13 to the oil pump control apparatus 20 and the motor 11. V _BAT ) and the ignition key input power V _IG are supplied, and a high voltage is supplied from the high voltage battery 12 to start the motor 11.

When the ignition key is turned off to stop driving of the oil pump in step S11, the control unit 24 latches to continuously supply the ignition key input power V _IG of the battery 13 for the power latch time T2. Control 36.

Thus, as shown in FIG. 2, the output signal LS of the latch 36 is maintained high during the power latch time T2.

When the output signal of the latch 36 is maintained in the high state as described above, the controller 24 sets the freeze frame in the memory 25 during the fault transit time T4 through the filtering time T3 entering the power latch. Control to save to location.

The controller 24 continuously receives the ignition key input power V _IG of the battery 13 to output a PWM control signal to drive the motor driving means 22, and the motor driving means 22 outputs a PWM control signal. The motor 11 is driven based on the energy stored in the circuit element inside the oil pump control apparatus 20 (S11).

Subsequently, the control unit 12 compares the high voltage inside the oil pump control device 20 with a preset reference voltage (S12).

As a result of the comparison in step S12, when the high voltage inside the oil pump control apparatus 20 is a reference voltage, that is, 60 V or more, the controller 24 uses the high voltage to drive the motor 11 and the preset reference drive. The time is compared (S13).

As a result of the comparison in step S13, when the motor driving time T5 is equal to or less than the reference driving time, that is, 200 ms, the control unit 24 proceeds to step S12.

On the other hand, if the high voltage inside the oil pump control apparatus 20 is less than the reference voltage in step S12, or if the motor driving time T5 exceeds the reference driving time in the comparison result of step S13, the controller 24 controls the battery. The latch 36 is controlled to a low value to block the ignition key input power V _IG supplied from (13).

As a result, the operation of the motor 11 and the oil pump control device 20 ends.

Through the above process, the present invention self-discharges the energy stored in the circuit element inside the oil pump control device by driving the motor for a predetermined time when the oil pump stops driving.

The scope of the present invention is not limited to the embodiments described above, but is defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self evident.

11: motor 12: high voltage battery
13: battery 14: main control unit
20: oil pump controller 21: power supply
22: motor driving means 23: communication unit
24: control unit 25: memory
31: PRA 32: EMC filter
33: current sensing unit 34: voltage conversion circuit
35: constant voltage regulator 36: latch

Claims (7)

A power supply unit for supplying driving power to a motor for driving an oil pump by receiving supply power from a high voltage battery and a battery;
Motor driving means for driving the motor by switching the driving power;
And a control unit for controlling the motor driving means to forcibly drive the motor by using energy stored in a circuit element during a predetermined power latch time when the driving of the motor is stopped.
The power supply unit plug-in hybrid vehicle oil pump control device, characterized in that it comprises a latch controlled to have a low or high value by the control of the control unit according to whether the ignition key on or off. According to claim 1, wherein the power supply unit
A power relay assembly for blocking and connecting a high voltage flow from a high voltage battery,
EMC filter for reducing the EMC noise included in the high voltage applied from the power relay assembly,
A current sensing unit which senses a current applied to the motor driving means from the EMC filter and transfers a detection signal to the control unit;
A voltage conversion circuit for converting the constant power and ignition key input power supplied from the battery from the low voltage supply to the high voltage supply;
Plug-in hybrid vehicle oil pump control device further comprises a constant voltage regulator for converting the voltage level of the power supply and the ignition key input power. 3. The power latch time of claim 1 or 2, wherein the power latch time is
Filtering time to enter the power latch,
Fault transceiving time for storing the freeze frame at a predetermined position in memory, and
A time for forcibly driving the motor,
And the control unit controls the power relay assembly to block the high voltage applied to the motor driving means from the high voltage battery within the filtering time and the fault transit time. (a) turning off the ignition key to stop the operation of the oil pump;
(b) maintaining the ignition key input power supplied from the battery during the ignition key off operation in step (a) such that the ignition key input power is supplied for a predetermined power latch time;
(c) generating a control signal for driving an oil pump driving motor using the ignition key input power supplied in step (b); and
and (d) forcibly driving the motor to self-discharge the energy stored in the circuit element inside the oil pump control apparatus based on the control signal generated in step (c). Self-discharge method of the device. The method of claim 4, wherein step (d)
(d1) comparing the high voltage inside the oil pump controller with a preset reference voltage after driving the motor;
(d2) comparing the time forcibly driving the motor with a preset reference driving time when the high voltage inside the oil pump control device is equal to or greater than the reference voltage as a result of the comparison in the step (d1); and
(d3) The ignition key when the high voltage inside the oil pump control device is less than the reference voltage as a result of the comparison in the step (d1) or the forced driving time of the motor exceeds the reference drive time as a result of the comparison in the step (d2). Self-discharging method of the plug-in hybrid vehicle oil pump control device comprising the step of shutting off the supply of input power. The method according to claim 4 or 5,
(e) entering the power latch for a preset filtering time and forcibly storing a freeze frame for a preset fault transit time before forcibly driving the motor in step (d). Self-discharge method of vehicle oil pump control system. The method according to claim 6,
and (f) disconnecting, by the power relay assembly, the high voltage supplied from the high voltage battery before the filtering time and fault translating time have elapsed during the ignition key off operation. Self-discharge method of the device.

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