KR20170108592A - Protection method for battery of hybrid vehicle - Google Patents

Abstract

The present invention relates to a method for protecting a battery of a hybrid vehicle. According to an embodiment of the present invention, the method for protecting a battery of a hybrid vehicle comprises: a DC/DC converter connected to a battery for high voltage and a battery for low voltage, respectively; a power module unit connected with voltages of the battery for high voltage and the battery for low voltage in the DC/DC converter; an MCU directing a converting operation of the DC/DC converter; and a DC/DC control unit performing the converting operation of the DC/DC converter. The method for protecting a battery of a hybrid vehicle comprises the following steps: detecting the abnormality of high voltage and low voltage of the power module unit in the DC/DC converter; and performing double control on the DC/DC converter to be separated from the battery for high voltage and the battery for low voltage according to detection of the abnormality. The present invention can be controlled in a dual way to protect a main engine and the battery in the hybrid vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery protection method for a hybrid vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery protection method, and more particularly, to a battery protection method of a hybrid vehicle that protects a battery through control of a DCDC converter in a hybrid vehicle.

A battery of a hybrid vehicle (HEV) or an electric vehicle (EV) can supply power to an engine and a fuel tank of an automobile using fossil fuel (for example, gasoline). Accordingly, the battery of a hybrid vehicle or an electric vehicle can be an important index for estimating or predicting the fuel gauge and the travelable distance.

In a hybrid vehicle, a large-capacity battery is used as a main battery and is controlled by a temperature controller so as to operate at an optimum temperature. On the other hand, a DC converter such as a DC / DC converter can be used to drop or supply power to a lower voltage than the main battery.

Fig. 1 shows a configuration diagram of a conventional hybrid vehicle.

1, the hybrid vehicle 10 includes an internal combustion engine 1, a motor 2, an inverter 3, a battery relay control unit 4, a large capacity battery 5 and a DC / DC converter 6 do.

The internal combustion engine 1 and the motor 2 are connected to a shaft belt so that electric energy can be charged into the large capacity battery 5 through the inverter 3 when the motor 2 is driven. Also, the large-capacity battery 5 can supply the electric energy to the DC / DC converter 6, and the DC / DC converter 6 can reduce the voltage for the 12V battery. In some cases, the energy of the 12V battery can be charged into the large capacity battery 5 through the DC / DC converter 6. On the other hand, the battery relay control unit 4 includes a relay for protecting the large capacity battery 5 from an overcurrent.

Here, the DC / DC converter 6 is capable of bidirectional operation, and its function and role are important. Since the DC / DC converter 6 is related to the large-capacity battery and the 12V battery, it is important to detect whether or not the voltage of the DC / DC converter 6 exceeds the operating voltage range during the voltage buck operation and the boost operation. Failure to meet these voltage ranges may cause damage to the electrical circuitry, which is likely to lead to engine shutdowns or faults.

Therefore, when a problem associated with the DC / DC converter 6 occurs, a method and an algorithm for protecting the internal battery are needed.

An object of the present invention is to provide a battery protection method for a hybrid vehicle so as to safely protect the battery.

It is another object of the present invention to provide a method of protecting a battery of a hybrid vehicle by double checking using both a software method and a hardware method to securely protect the battery.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method of protecting a battery of a hybrid vehicle, comprising: providing a high-voltage battery and a low- In a hybrid vehicle including a power module unit connected with a voltage, an MCU indicating a converting operation of the DC / DC converter, and a DCDC control unit performing a converting operation of the DC / DC converter, Detecting a malfunction of the high voltage and the low voltage of the DC / DC converter and separating the DC / DC converter from the high voltage battery and the low voltage battery in accordance with the abnormality detection.

According to an embodiment of the present invention, the double controlling step may include a software controlling step and a hardware controlling step.

According to an embodiment of the present invention, the hardware control may deactivate the DCDC control unit using a shutdown signal and a deactivation signal generated by the abnormality detection of the high voltage and the low voltage.

In this case, when the DC / DC converter control unit is inactivated, when the power module unit includes the high voltage MOSFET module and the low voltage MOSFET module, the DC / DC converter, the high voltage battery, So that the electrical connection to the low-voltage battery can be short-circuited.

According to an embodiment of the present invention, the corresponding MOSFET module is turned off when the voltage abnormality of the high voltage battery is detected, and when the voltage abnormality of the low voltage battery is detected, And turning off the MOSFET module.

The step of software control according to an embodiment of the present invention includes not providing a reference signal from the MCU to the DCDC control unit by the abnormality detection of the high voltage and the low voltage.

The battery protecting method of the hybrid vehicle according to the present invention as described above can safely protect the battery.

Also, the battery protection method of the hybrid vehicle according to the present invention can protect the battery by double checking using both a software method and a hardware method.

Further, the battery protection method of the hybrid vehicle according to the present invention can securely operate the vehicle by protecting the battery safely and reliably.

1 is a configuration diagram of a conventional hybrid vehicle,
2 is a configuration diagram of a hybrid vehicle according to an embodiment of the present invention;
3 is a configuration diagram of a control unit of the DC / DC converter according to FIG. 2,
Fig. 4 is a conceptual configuration diagram of the power module unit according to Fig. 3,
Fig. 5 is a circuit diagram showing the relationship between the first and second switches and the power module unit of Fig. 2,
Fig. 6 is a configuration diagram of the MCU according to Fig. 3, and
7 is a flowchart showing the operation of the control unit of the DC / DC converter.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

2 shows a configuration of a hybrid vehicle 100 according to an embodiment of the present invention.

2, a hybrid vehicle 100 according to an embodiment of the present invention includes a first battery 110, a battery relay controller 120, an inverter 130, a DC / DC converter 140, a motor 150, an internal combustion engine 160, a starter 170, and a second battery 180.

The first battery 110 may be a large capacity battery, a lithium ion battery, for example, 12 cells may be connected in series. The capacity of the first battery 110 is exemplified as 48V. The first battery 110 is provided to supply electric power to the electrical equipment having a large consumption amount of fuel consumption when the load of the electrical equipment in the vehicle increases and the supply of electricity is insufficient at 12V. The first battery 110 may operate as a main battery.

The battery relay control unit 120 is provided to protect the first battery 110 from an overcurrent, and the battery relay control unit 120 may include a relay and a fuse.

The inverter 130 may charge the first battery 110 with electrical energy when the motor 150 is driven.

The DC / DC converter 140 may buck the 48V voltage of the first battery 110 to the 12V voltage of the second battery 180. In some cases, the 12V voltage of the second battery 180 may be charged to the first battery 110 through the DC / DC converter 140.

The DC / DC converter 140 includes a first switch 141, a second switch 142, and a controller 143. The DC / DC converter 140 is capable of bidirectional operation.

The first switch 141 can short-circuit the connection with the first battery 110 when the DC / DC converter 140 is abnormal and the second switch 142 can short-circuit the connection with the first battery 110 when the DC / DC converter 140 is abnormal, The connection with the battery 180 can be short-circuited. Meanwhile, the control unit 143 checks whether the DC / DC converter 140 is abnormal, more specifically, detects the voltage range of the over-voltage and the under-voltage during the step-down operation and step-up operation of the DC / DC converter 140, And can double check by using hardware method and software method. Thus, when the voltage step-up operation and the step-down operation are detected, the controller 143 disables the DC / DC converter 140. Therefore, by shorting the first battery 110 and the second battery 180 and the DC / DC converter 140, the first battery 110 and the second battery 180 can be isolated from the abnormality of the DC / DC converter 140, Can be safely protected. A detailed description thereof will be made with reference to the following drawings.

The motor 150, the internal combustion engine 160, and the starter 170 are connected to and operated by a shaft belt. The internal combustion engine 160 may be an engine driven by fossil fuel. The starter 170 is provided to initially drive the internal combustion engine 160, and can receive power from the second battery 180.

The second battery 180 is illustrated as a 12V battery and can supply power to the main electrical components of the hybrid vehicle.

3 is a conceptual block diagram of the controller 143 of the DC / DC converter shown in FIG.

3, the control unit 143 includes a protection unit 1431, a signal conditioning unit 1432, a DCDC control unit 1433, an output processing unit 1434, a power module unit 1435, a power supply unit 1436 And an MCU 1437.

The protection unit 1431 detects a voltage abnormality of the power module unit 1435 and provides a signal that can disable the DCDC control unit 1433. [ The protection unit 1431 senses the voltage of the power module unit 1435 to sense a 'fault' and provide a 'shut down' signal.

The signal conditioning unit 1432 receives the 'shut down' signal from the protection unit 1431 and controls the DCDC control unit 1433, the output processing unit 1434 and the MCU 1437. Thus, the signal conditioning unit 1432 can provide the MCU 1435 with an instruction signal to sense an HV or LV abnormality so that it can enter the safe mode in response to the 'shut down' signal. In addition, the signal conditioning unit 1432 may provide a signal to deactivate the DCDC control unit 1433 and the output processing unit 1434. [

The DCDC control unit 1433 is controlled by the signal conditioning unit 1432 and the MCU 1437. The DCDC control unit 1433 can control the control unit 143 to generate the required duty signal using the reference signal provided by the MCU 1437 and thereby perform the voltage boosting operation and the voltage lowering operation. Substantially, the DCDC control unit 1433 performs a converting operation of the DC / DC converter.

On the other hand, the DCDC control unit 1433 is controlled by the signal conditioning unit 1432, and when the signal conditioning unit 1432 provides the inactivation signal, it receives it and deactivates the operation of the DCDC control unit 1433.

The output processing unit 1434 receives signals from the DCDC control unit 1433 and the signal conditioning unit 1432 and operates.

For normal operation, the output processing unit 1434 may provide the duty signal received from the DCDC control unit 1433 to the power module unit 1435. However, in the event of voltage or more, the output processing unit 1434 receives the deactivation signal from the signal conditioning unit 1432 and transmits it to the power module unit 1435.

The power module unit 1435 will be described in more detail with reference to FIG.

The power module unit 1435 includes a first MOSFET module 1435-1, a second MOSFET module 1435-2, and a gate driver 1435-3. Power lines of high voltage (HV) and low voltage (LV) are connected to both ends of the power module unit 1435, which may be a power line for 48V and a power line for 12V, respectively. This may be a power line connected to the first battery 110 and the second battery 180 of FIG.

The first MOSFET module 1435-1 may include a plurality of MOS FETs for HV (high voltage), and the second MOSFET module 1435-2 may include a plurality of MOS FETs for LV have.

5 is a simplified circuit diagram showing the relationship between the first switch 141, the second switch 142, and the power module unit 1435 of the DC / DC converter of FIG.

Referring to FIG. 5, the first MOSFET module 1435-1 includes a plurality of MOS FETs connected in parallel, and is connected to the first switch 141. Meanwhile, the second MOSFET module 1435-2 includes a plurality of MOS FETs connected in parallel, and is connected to the second switch 142.

Thus, when a voltage abnormality is detected during the step-up operation, the first MOSFET 1435-1 is deactivated and the first switch 141 is turned off, thereby preventing the first battery (see 110 in FIG. 2) Lt; / RTI > On the other hand, if a voltage abnormality is detected during the step-down operation, the second MOSFET 142 is turned off and the second switch 142 is turned off, Lt; / RTI >

The power supply unit 1436 is a power supply unit that supplies power to the controller 143 as a whole.

The MCU 1437 is configured as shown in FIG. 6 and includes a voltage monitor unit 1437-1 and a processor 1437-2. The MCU 1437 actually senses and monitors the high voltage and the low voltage (or voltage abnormality during voltage increase and voltage drop during voltage decrease) of power module unit 1435 using voltage monitor unit 1437-1 as a main controller. MCU 1437 uses processor 1437-2 to determine each voltage and current level and provides a reference signal that can be used to generate a duty signal.

As will be described later in detail, the controller 143 of the DC / DC converter according to an exemplary embodiment of the present invention safely protects the battery from the DCDC converter when the voltage abnormality is detected by dual control of software control and hardware control .

That is, a hardware control is performed to control deactivation of the power module unit 1435 by providing an inactivated electrical signal from the protection unit 1431 providing the shutdown signal by the detection error to the power module unit 1435 can do. The MCU 1437 also senses the voltage abnormality and compares the monitored result to check the result received from the protection unit 1431 via the signal conditioning unit 1432. If the actual abnormality is checked, the processor 1437- 2 to stop providing the reference signal. This control can be implemented by stopping the operation of the data, and can provide software control from the MCU 1435 to stop the power module unit 1435 by providing a signal associated with deactivation.

7 is a flowchart showing the operation of the control unit of the DC / DC converter according to FIG.

3 to 7, the operation of the control unit of the DC / DC converter will be described.

First, when abnormality of the high voltage (HV) and low voltage (LV) sensed from the power module unit 1435 occurs (S110), the controller 143 according to the embodiment of the present invention simultaneously performs double control.

When the protection unit 1431 detects a failure and provides a shutdown signal (S120), the DCDC control unit 1433 is controlled to be inactivated after the signal is converted via the signal conditioning unit 1432 (S130 ).

Accordingly, the corresponding MOSFET module in the power module unit 1435 is inactivated. For example, when the voltage falling from 48V to 12V is detected to be in excess or below a voltage error range, for example, 6.5V to 16V, it can be determined to be equal to or lower than the low voltage of the DCDC converter (140 in FIG. 2). Accordingly, the second MOSFET module 1435-2, which is a low voltage MOSFET module in the power module unit 1435, is turned off, and the second switch (see 142 in FIG. 2) connected thereto is also turned off. 2) and the DCDC converter (see 140 in FIG. 2) are electrically isolated from each other, so that the second battery (see 180 in FIG. 2) is electrically isolated from the second battery Can be protected.

If, for example, the step-up operation from 12V to 48V exceeds the error range of the voltage, it can be judged to be higher than the high voltage of the DCDC converter (140 in FIG. 2). Accordingly, the first MOSFET module 1435-1, which is a high-voltage MOSFET module in the power module unit 1435, is turned off, and the first switch (see 141 in FIG. 2) connected thereto is also turned off. 2) and the DCDC converter (refer to 140 in FIG. 2) are electrically isolated from each other, so that the second battery (see 180 in FIG. 2) is electrically isolated from the first battery Can be protected.

On the other hand, when an abnormality of the high voltage and the low voltage sensed from the power module unit 1435 occurs (S110), the MCU 1437 also checks the result received from the protection unit 1431 via the signal conditioning unit 1432 If the actual abnormality is checked, the processor 1437-2 stops providing the reference signal (S150).

Accordingly, the DCDC control unit 1433 is inactivated because it can not operate because it does not receive the reference signal. Thus, finally, the operation of the power module unit 1435 is also inactivated, so that the battery protection method can be completed.

The reason why the MCU 1437 detects a fault is to check again to discriminate between instantaneous overshoot and undershoot of the voltage and actual converter error even if it is controlled by hardware. Furthermore, even when providing a hardware-deactivated electrical signal, the MCU 1437 does not provide a reference signal when the actual circuit is turned off, or when the timing of turning off the actual circuit is delayed, have.

Here, the step from S120, S130, and S140 may be referred to as hardware control by controlling the steps of S120, S130, and S140 by an electrical signal, and the MCU 1437 may control the steps leading to S150 and S160 to be software control.

According to an embodiment of the present invention, the hybrid vehicle can be controlled in a dual way to protect the main engine and the battery. Thus, the safe operation of the vehicle can be achieved by protecting the battery more securely and reliably.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

110: First battery
120: Battery relay control unit
130: inverter
140: DC / DC converter
150: motor
160: Internal combustion engine
170: Starter
180: Second battery

Claims (6)

A DC / DC converter connected to the high voltage battery and the low voltage battery, a power module unit connected to the voltage of the high voltage battery and the low voltage battery in the DC / DC converter, an MCU for instructing the conversion operation of the DC / And a DCDC control unit for performing a converting operation of the DC / DC converter, the method comprising:
Detecting an abnormality of a high voltage and a low voltage of the power module unit in the DC / DC converter; And
And double-controlling the DC / DC converter to separate the high-voltage battery and the low-voltage battery according to the abnormality detection
A battery protection method of a hybrid vehicle.
The method according to claim 1,
Wherein the double-
Controlling in hardware; And
Comprising software-controlled steps
A battery protection method of a hybrid vehicle.
3. The method of claim 2,
Wherein the hardware control comprises:
And deactivates the DCDC control unit using the shutdown signal and the deactivation signal generated by the abnormality detection of the high voltage and the low voltage
A battery protection method of a hybrid vehicle.
The method of claim 3,
When the DC / DC converter control unit is deactivated, when the power module unit includes a high-voltage MOSFET module and a low-voltage MOSFET module, the MOSFET module is turned off and the high-voltage battery and the low- To control the electrical connection of the battery to short-circuit
A battery protection method of a hybrid vehicle.
5. The method of claim 4,
When the corresponding MOSFET module is turned off,
When the voltage abnormality of the high voltage battery is detected, the high voltage MOSFET module is turned off,
When the voltage abnormality of the low voltage battery is detected, the low voltage MOSFET module is turned off
A battery protection method of a hybrid vehicle.
3. The method of claim 2,
The method of claim 1,
And not providing the reference signal as a reference from the MCU to the DCDC control unit by the abnormality detection of the high voltage and the low voltage
A battery protection method of a hybrid vehicle.

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