KR101284336B1 - System and method for enforced discharge of environment-friendly vehicle - Google Patents

Abstract

Disclosed are a forced discharge system of a green vehicle and a method thereof.
Forced discharge system of an environmentally friendly vehicle according to an embodiment of the present invention, the monitoring unit for monitoring the start-up (IG OFF) or failure of the vehicle, if the start-up (IG OFF) or the failure occurs as an upper level controller HCU (Hybrid Control Unit) for determining the normality of the controller to transfer a forced discharge command to the lower controller in normal operation, MCU (Motor Control Unit) for controlling the forced discharge using a motor when receiving the forced discharge command, Generator control unit (GCU) that controls the execution of forced discharge using HSG (Hybrid Starter-Generator) upon receiving the forced discharge command, and low voltage DC- (LDC) that controls the forced discharge through the electric load upon receiving the forced discharge command DC Converter).

Description

Forced discharge system of environmentally friendly vehicle and its method {SYSTEM AND METHOD FOR ENFORCED DISCHARGE OF ENVIRONMENT-FRIENDLY VEHICLE}

The present invention relates to a forced discharge system and a method of an environmentally friendly vehicle, and more particularly to a forced discharge system and a method of an environmentally friendly vehicle to protect the user from the high voltage of the environmentally friendly vehicle.

In general, unlike conventional internal combustion engine cars, hybrid electric vehicles (HEVs) and electric vehicles (EVs), which are environmentally friendly vehicles, can be driven by the power of a motor.

In other words, the eco-friendly car is driven by the power of the motor, not the engine, so that a high-voltage large-capacity battery is installed, and environmental vehicle manufacturers are making a lot of efforts to secure safety from high voltage.

On the other hand, Figure 1 schematically shows a system configuration of a general eco-friendly vehicle.

Referring to FIG. 1, an inverter for driving a driving motor and an HSG (Hybrid Starter-Generator) of an eco-friendly vehicle is equipped with a large capacity capacitor for stably receiving power from a main battery. This large-capacity capacitor suppresses noise and ripple of the power supplied to attenuate voltage fluctuations.

When the eco-friendly vehicle is in the key ON state, the main relay of the main battery is turned on together, and a high voltage is charged in the large capacity capacitor. As a result, the inverter or the low voltage DC-DC converter (DC) converts a constant DC voltage. Can be driven.

However, in the event of an environmentally friendly vehicle failure or a key off condition, the main relay of the main battery is turned off, and the energy in the large capacity capacitor starts to discharge gradually. In this state, if there is no action and wait for natural discharge, there is a problem that the discharge time becomes long and may cause a danger due to high voltage.

An example of such a problem is as follows.

First, if the user opens the vehicle bonnet immediately after the key off and disconnects the high voltage line from the controller, it may cause a danger due to high voltage (when IG OFF).

Second, when a high collision occurs from the outside of the airbag (airbag) to operate, if the high voltage connector is separated from the controller to contact the vehicle body or the other surface it may cause a danger due to high voltage (in case of airbag signal).

Third, if the user disconnects the high voltage connector from the controller while the ignition is on, it may cause a high voltage (at the time of unlocking the interlock).

Therefore, there is an urgent need for a method of eliminating secondary hazards caused by high voltage by forcibly discharging the high voltage formed from the main battery as quickly as possible in a faulty state of an environmental vehicle or a normal IG off condition.

Patent Document 1: Korean Patent Publication No. 2008-0014395 (published Feb. 14, 2008)

Accordingly, an object of the present invention is to provide an environmentally friendly automobile discharge system and method for protecting a user from high voltage in a faulty state of an environmentally friendly vehicle or a normal IG off situation.

In order to solve the above technical problem, the forced discharge system of an environmentally friendly vehicle according to an embodiment of the present invention,

A monitoring unit for monitoring an IG OFF or fault condition of the vehicle; A hybrid control unit (HCU) for determining whether the lower controllers are normal and transmitting a forced discharge command to the lower controller in normal operation when the IG OFF or the failure occurs as an upper controller; A MCU (Motor Control Unit) for controlling the execution of a forced discharge using a motor upon receiving the forced discharge command; A generator control unit (GCU) for controlling a forced discharge using a hybrid starter-generator (HSG) when the forced discharge command is received; And a low voltage DC-DC converter (LDC) for controlling forced discharge through an electric load when receiving the forced discharge command.

The HCU may turn off the main relay of the battery and stop the engine driving when the engine is being driven.

In addition, the monitoring unit, a start monitoring module for detecting a start on (IG ON) or a start off (IG OFF) state of the vehicle; An engine monitoring module for monitoring a driving state of the engine; A bonnet monitoring module configured to monitor an open or closed state of the bonnet; An airbag monitoring module configured to monitor an airbag operated state due to an external physical collision; And a controller monitoring module that checks the line state or input / output signals of the MCU, the GCU, and the LDC, and monitors whether the MCU, the GCU, and the LDC are normal according to a setting criterion.

In addition, the lower controllers may discharge the voltage accumulated in the large capacity capacitor of the inverter.

In addition, the MCU and the GCU perform zero torque control in which the q (quadrature) axis current is 0 and the d (Direct) current is maximal, so that the voltages of the large capacity capacitors of the inverter are lost to the motor heat, respectively. Forced discharge system of eco-friendly car.

In addition, the motor is characterized in that the three-phase embedded permanent magnet synchronous motor.

In addition, the LDC may control the forced discharge by increasing the instantaneous charging voltage of the auxiliary battery or supplying power to the in-vehicle electric device.

On the other hand, according to another embodiment of the present invention, the upper controller includes a hybrid control unit (HCU) and a lower controller (HCU) (Hybrid Control Unit), GCU (Generator Control Unit) and LDC (Low voltage DC-DC Converter) How the forced discharge system of eco-friendly car performs forced discharge,

a) identifying a situation in which a hybrid control unit (HCU) needs to perform forced discharge by acquiring at least one information of IG OFF, bonnet opening, and airbag operation of the vehicle; b) turning off the main relay of the battery; And c) determining whether the lower controllers are normal and transmitting a forced discharge command to the at least one lower controller that operates normally to forcibly discharge the voltage accumulated in the large capacity capacitor of the inverter.

In addition, the step b) may include the step of stopping the engine driving (OFF) when the engine is driven by determining whether the HCU is driving the engine.

In addition, after step c), when d-1) the MCU receives the forced discharge command, a zero torque control is performed in which the q (quadrature) axis current of the motor is 0 and the d (direct) current is maximized. Performing the forced discharge; d-2) when the GCU receives the forced discharge command, performing the forced discharge by performing the zero torque control of a hybrid starter-generator (HSG); And d-3) at least one of a low voltage DC-DC converter (LDC) step of supplying power to an electric load to perform the forced discharge when the LDC receives the forced discharge command.

In addition, the step c) is characterized in that the HCU checks the line state or input and output signals of the lower controllers and determines whether or not each of the lower controllers in accordance with the setting criteria.

In addition, step d-3) may include the step of the LDC to increase the instantaneous charging voltage of the auxiliary battery or to supply power to the in-vehicle electrical device.

According to the embodiment of the present invention by the above-described configuration, in the event of an IG OFF situation of the eco-friendly vehicle or an accident that the airbag is operated, there is an effect that can be quickly forced discharge to protect the user from high voltage have.

In addition, when the interlock is released and the accident occurs, the engine is forcibly turned off to prevent back electromotive force generation, and the effective discharge can be performed by selectively performing the forced discharge using the lower controllers in the normal state.

1 schematically shows a system configuration of a general eco-friendly vehicle.
2 is a schematic view showing a forced discharge system of an eco-friendly vehicle according to an embodiment of the present invention.
3 is a block diagram schematically illustrating a configuration of a monitoring unit according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a forced discharge method of an environmentally friendly vehicle according to an exemplary embodiment of the present invention.
5 illustrates a state in which a capacitor is charged by a back EMF voltage when the main relay is turned off.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Throughout the specification, an environmentally friendly vehicle is meant to include a hybrid vehicle (HEV) and an electric vehicle (EV).

Now, a forced discharge system and a method of an environmentally friendly vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings.

2 is a schematic view showing a forced discharge system of an eco-friendly vehicle according to an embodiment of the present invention.

Referring to FIG. 2, the forced discharge system 100 of an eco-friendly vehicle according to an exemplary embodiment of the present invention includes a battery 110, a main relay 120, a motor control unit (MCU) 130, and a motor. 131, generator control unit (GCU) 140, HSG (Hybrid Starter and Generator) 141, LDC (low voltage DC-DC converter) 150, engine controller (Engine Control Unit, ECU) 160, a monitoring unit 170, and a hybrid control unit (HCU) 180.

The battery 110 supplies power to the motor 131 with a large capacity high voltage battery, and is charged with the regenerative braking energy of the motor 131 in the regenerative braking mode by brake braking.

The main relay 120 is turned on according to the IG ON state of the vehicle to apply the high voltage power of the battery 110 and is turned off according to the IG OFF state of the vehicle. Shut off the power supply.

The MCU 130 includes an inverter and controls the driving of the motor 131 according to a control signal applied from the HCU 180 through a network.

In particular, the MCU 130 may perform a forced discharge using the motor 131 according to the forced discharge command of the HCU 180 in a state in which the main relay 120 is turned off.

For example, the MCU 130 performs zero torque control in which the q (quadrature) axis current of the motor is 0 and the d (Direct) current is maximal, so that the voltage is lost to the heat in the motor 131. Here, if the q-axis current is 0, no torque occurs even if a large d-axis current flows. Therefore, when the vehicle is turned off (IG OFF) or when the airbag operation signal is detected (in an accident), only the d-axis current is applied to the maximum value without applying the q-axis current, so that most of the current is generated without generating torque of the motor 131. ) Can be lost as heat.

The motor 131 may be configured as an embedded permanent magnet synchronous motor, which is a three-phase AC motor, and is driven according to the control of the MCU 130 to adjust the output torque and determine the deceleration time. Perform regenerative braking with the regenerative braking amount.

The GCU 140 controls the amount of power generated by the HSG 141 according to the output power of the starting motor and the control of the HCU 180.

In particular, the GCU 140 may perform a forced discharge using the HSG 141 according to the forced discharge command of the HCU 180 in the state in which the main relay 120 is turned off.

The hybrid starter and generator (HSG) 141 is a hybrid starting and generating motor that generates power for starting the vehicle.

The LDC 150 converts DC into a low voltage DC-DC converter to make an alternating current, and boosts or lowers the alternating current using a coil, transformer, or capacitance, and then rectifies and converts the DC into DC to match the voltage used in each electric load. Supply electricity.

In particular, the LDC 150 may perform the forced discharge by increasing the instantaneous power consumption through the electric load in accordance with the forced discharge command of the HCU 180 in the state in which the main relay 120 is OFF.

The ECU 160 controls the overall operation of the engine according to a control signal applied from the HCU 180 which is the upper controller through the vehicle network.

The monitoring unit 170 It collects the sensing information for monitoring the overall operating state of the eco-friendly car and analyzes it and delivers the monitored information to the HCU 180.

3 is a block diagram schematically illustrating a configuration of a monitoring unit according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the monitoring unit 170 according to an embodiment of the present invention includes a start monitoring module 171, an engine monitoring module 172, a bonnet monitoring module 173, an airbag monitoring module 174, and a controller. Monitoring module 175.

The start monitoring module 171 detects a start on (IG ON) and a start off (IG OFF) state of the eco-friendly vehicle from an input of the start key.

The engine monitoring module 172 monitors the driving state of the engine and an operating state such as RPM.

The bonnet monitoring module 173 monitors the open or closed state of the bonnet for inspection for accidents, breakdowns and maintenance of the vehicle.

The airbag monitoring module 174 monitors a failure situation of the vehicle in which the airbag is operated by an external physical collision.

The controller monitoring module 175 checks the line state or input / output signal of the lower controllers of the MCU 130, the GCU 140, and the LDC 150, and monitors whether the lower controllers are normal according to the setting criteria. Here, monitoring whether the lower controllers are normal means determining whether the driving motor 131, the HSG 141, and the electric load are connected to the lower controllers, respectively.

In the above description, the monitoring unit 170 is illustrated as being separately configured from the HCU 180 in FIG. 2 for convenience, but is not limited thereto and may be included in the HCU 180.

The HCU 180 is a high level controller that controls the overall operation of the eco-friendly vehicle as a CAN and communicates with the lower controllers MCU 130, the GCU 140, and the LDC 150 by CAN, and the torque, speed, and power generation torque of the motor. Control the amount.

The HCU 180 receives the IG OFF, the airbag signal, and the interlock release situation, which may cause a danger due to the high voltage presented in the background, from the monitoring unit 170 to identify a situation in which forced discharge is to be performed. It is determined whether the MCU 130, the GCU 140, and the LDC 150 which are the lower controllers are normal. Then, a forced discharge command is transmitted to the controllers in normal operation so that the high voltage remaining in the capacitor is quickly forcedly discharged.

In addition, the HCU 180 communicates with the ECU 160 that controls the engine to perform engine start-related relay control and failure diagnosis, and transmits an engine off command to the ECU 160 when a situation requiring the forced discharge occurs. Control to turn off the engine.

Thus, the general control operation in the forced discharge system 100 of the eco-friendly vehicle according to an embodiment of the present invention including the function as described above is made the same or similar to the hybrid vehicle and the electric vehicle, the operation description for this It abbreviate | omitted and demonstrated only the operation | movement required for forced discharge.

On the other hand, by using the configuration of the forced discharge system 100 of the environmentally friendly vehicle according to an embodiment of the present invention will be described a forced discharge method for protecting the user from the danger of high voltage.

4 is a flowchart illustrating a forced discharge method of an environmentally friendly vehicle according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the HCU 180 of the forced discharging system 100 of the eco-friendly vehicle according to the exemplary embodiment of the present invention is an IG OFF signal, a bonnet opening signal, and an airbag operation from the monitoring unit 170. Receiving at least one of the signals to determine the situation to perform a forced discharge (S110).

The HCU 180 blocks the high voltage of the battery 110 from being applied to the inverter or the motor by turning off the main relay 120 for forced discharging (S120).

The HCU 180 determines whether the engine is in an OFF state, and if the engine is being driven (S130; no), the HCU 180 transmits an engine off command to the ECU 160 to stop the engine driving (S140). On the other hand, if it is determined that the engine OFF (S130) state in step S130 (S130; Yes), the step S140 is omitted.

Forced discharge in the present invention means to quickly drop the voltage of the inverter large capacitor, while in the event of an accident in which the interlock or airbag is activated, the engine is driven for a certain time even if the main relay 120 is OFF (OFF) There is a problem that the capacitor is charged by the voltage.

5 illustrates a state in which a capacitor is charged by a back EMF voltage when the main relay is turned off.

In general, in the structure of an environmentally friendly vehicle, since the engine and the HSG 141 are connected by poly, when the engine is turned on, the counter electromotive force is transferred to the battery 110 through the HSG 141.

In addition, as shown in FIG. 5, even when the main relay 120 is turned off, when the engine is being driven, there is a problem in that a reverse capacitance voltage of at least 100 V or more is charged to the large capacity capacitor. As described above, in order to solve the problem of forced discharge of the large capacity capacitor, the HCU 180 according to the embodiment of the present invention performs the forced off control of the engine when an interlock release or airbag operation signal is generated.

Next, the HCU 180 determines whether the lower controller MCU 130, the GCU 140, and the LDC 150 are in a normal state, and performs a forced discharge using only the lower controller determined to be in a normal state (S150). . In this case, although omitted in FIG. 4, the HCU 180 does not perform a forced discharge to a specific lower controller that is determined as a fault state among the MCU 130, the GCU 140, and the LDC 150 instead of the normal state.

For example, attempting to force discharge to a lower controller where a failure of the control associated with the control has occurred may cause greater problems such as overvoltage. Therefore, the HCU 180 determines the normal state of the lower controller and selectively uses only the lower controller determined as the normal state to perform the forced discharge.

First, when it is determined that the MCU 130 is normal (S161), the HCU 180 transmits a forced discharge command to the MCU 130, and the MCU 130 performs a forced discharge using the zero torque control of the motor.

In addition, when the HCU 180 determines that the GCU 140 is normal (S171), the HCU 180 transmits a forced discharge command to the GCU 140, and the GCU 140 performs a forced discharge using the zero torque control of the HCU 141. To perform.

In addition, when it is determined that the LDC 150 is normal (H181), the HCU 180 transmits a forced discharge command to the LDC 150, and the LDC 150 momentarily increases power consumption of the electric load to perform a forced discharge. do. For example, the LDC 150 may increase the instantaneous charging voltage of the auxiliary battery (not shown) or supply power to the in-vehicle electric device to increase the instantaneous power consumption.

When the forced discharge of the large capacity capacitor is completed, the HCU 180 terminates the forced discharge situation as the risk due to the high voltage is eliminated (S190).

As described above, according to an exemplary embodiment of the present invention, when an IG OFF situation of an eco-friendly vehicle or an accident that an airbag is operated occurs, a forced discharge is quickly performed to protect a user from high voltage.

In addition, when the interlock is released and the engine is turned off in the event of an accident, the counter electromotive force is prevented, and the forced discharge is selectively performed by using the lower controllers in the steady state, thereby improving the stability of the forced discharge.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100: forced discharge system 110: battery
120: main relay 130: MCU
131: motor 140: GCU
141: HSG 150: LDC
160: ECU 170: monitoring unit
180: HCU

Claims (12)

A monitoring unit for monitoring an IG OFF or fault condition of the vehicle;
A lower controller connected to CAN communication when receiving an IG OFF or a failure occurrence from the monitoring unit as an upper controller, wherein the lower controller means MCU, GCU, and LDC, which will be described later. A hybrid control unit (HCU) for determining a normal state of the signals and forcing a discharge command for a charge accumulated in a large capacitor of an inverter to a lower controller in a normal operation;
A motor control unit (MCU) for controlling a forced discharge using a vehicle driving motor when the forced discharge command is received from the HCU;
A generator control unit (GCU) for controlling a forced discharge using a hybrid starter-generator (HSG) when the forced discharge command is received from the HCU; And
When receiving the forced discharge command from the HCU includes a low voltage DC-DC converter (LDC) for controlling the forced discharge through the electric load,
The HCU checks the line state or input / output signal of each CAN communication of the lower controllers and determines whether the lower controller is normal according to a setting criterion. The method of claim 1,
The HCU,
Compulsory discharge system of the eco-friendly vehicle, characterized in that the main relay of the battery according to the start-off or the failure situation occurs, and the engine driving is stopped (OFF) when the engine is running. 3. The method according to claim 1 or 2,
The monitoring unit,
A start monitoring module for detecting a start on state (IG ON) or a start off state (IG OFF) of the vehicle;
An engine monitoring module for monitoring a driving state of the engine;
A bonnet monitoring module configured to monitor an open or closed state of the bonnet;
An airbag monitoring module configured to monitor an airbag operated state due to an external physical collision; And
Controller monitoring module that checks the line state or input / output signal of the CAN communication connected to the MCU, GCU and LDC, respectively and monitors whether or not it is normal according to a setting standard.
Forced discharge system of an environmentally friendly vehicle, characterized in that it comprises at least one of. delete The method of claim 1,
The MCU includes:
Forced discharge system of an eco-friendly vehicle, characterized in that the charge of the large capacity capacitor of the inverter is consumed by the heat of the motor by performing a zero torque control in which the q (quadrature) axis current of the motor is 0 and the d (Direct) current is maximized. . The method of claim 5, wherein
The motor includes:
Forced discharge system of an eco-friendly vehicle, characterized in that the three-phase embedded permanent magnet synchronous motor. The method of claim 1,
The LDC,
The forced discharge system of the eco-friendly vehicle, characterized in that to control the forced discharge by increasing the instantaneous charging voltage of the auxiliary battery or by supplying power to the electric device in the vehicle. Forced discharge of environmentally friendly vehicles including the HCU (Hybrid Control Unit), the upper controller, the Motor Control Unit (MCU), the Generator Control Unit (GCU), and the Low Voltage DC-DC Converter (LDC) In the way,
a) determining that the forced discharge should be performed when the hybrid control unit (HCU) acquires at least one of IG OFF, bonnet opening, and airbag operation of the vehicle;
b) the HCU turns off the main relay of the battery according to the determination; And
c) the HCU determines whether the lower controllers connected by CAN communication are normal and transmits a forced discharge command to at least one lower controller that operates normally to forcibly discharge charges accumulated in a large capacity capacitor of the inverter. But
In the step c), the HCU checks a line state or an input / output signal of each CAN communication connected to the lower controllers, and determines whether the lower controllers are normal according to a setting criterion. Forced discharge method. The method of claim 8,
The step b)
Compulsory discharge method of the eco-friendly vehicle comprising the step of stopping the engine driving when the engine is driven by determining whether the HCU is driving the engine. 10. The method according to claim 8 or 9,
After step c)
d-1) when the MCU receives the forced discharge command, performing the forced discharge by performing a zero torque control in which a q (quadrature) axis current of the motor is 0 and a d (Direct) current is maximized;
d-2) when the GCU receives the forced discharge command, performing the forced discharge by performing the zero torque control of a hybrid starter-generator (HSG); And
d-3) a low voltage DC-DC converter (LDC) step of supplying power to an electric load to perform the forced discharge when the LDC receives the forced discharge command
Forced discharge method of an environmentally friendly vehicle comprising at least one of. delete 11. The method of claim 10,
d-3) step,
The method of claim 1, wherein the LDC increases the instantaneous charging voltage of the auxiliary battery or supplies power to the in-vehicle electric device.

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