KR20020021525A - Power apparatus for preventing from firing of car - Google Patents

Abstract

PURPOSE: A power supply is provided to prevent fire of a vehicle when a vehicle accident occurs while operating predetermined load parts of the vehicle required for a safety travelling of the vehicle. CONSTITUTION: A power supply comprises the first load section(10) and the second load section(20) parallel connected to the first load section(10). The first load section(10) includes a headlight(11) and a wiper(13). The second load section(20) includes a brake(21), a power handle, and an emergency lamp(23). A main power section(30) supplies a main power to the first and second load sections(10,20). A fire preventing section(40) is arranged at a grounding terminal of the main power section(30) so as to shut off the main power when vehicle accident occurs. A sub-power section(50) is connected to the second load section(20). A diode(60) is positioned between the main power section(30) and the sub-power section(50). The main power section(30) includes a main storage battery(31) and a generator(33).

Description

Power device for preventing from firing of car

The present invention relates to a power supply for a vehicle, and more particularly, to a power supply for preventing a vehicle fire to prevent the occurrence of a vehicle fire in the event of a vehicle crash and electrical short-circuit and to prevent the complete discharge of the main power in normal will be.

In general, vehicles such as passenger cars, buses, vans, vans, and special vehicles use power devices to supply various loads such as headlights, taillights, wipers, brakes, power handles, and emergency lights. In recent years, despite the rapid improvement in vehicle performance, minor contact accidents and large collision accidents have surged due to driver's inexperience or carelessness, resulting in enormous increases in human injury and property damage.

Fires generated from vehicles can be classified into natural fires and fires caused by collisions. Vehicle fires caused by collision accidents are severely damaged by the mechanical impacts of vehicle collisions, causing flammable substances such as gasoline, engine fuel, and engine oil to flow to the outside. By shorting or sparking the connector and thereby igniting the flammable material. In addition, a natural vehicle fire may be caused by a short-circuit of the electrical wiring due to deterioration of the connector for connecting various electrical wirings in the vehicle with age.

However, since a vehicle for preventing a vehicle fire is not properly equipped in a conventional vehicle, the vehicle fire is a serious problem especially when a vehicle collision occurs in a high-speed driving state. Therefore, it can be said that in the case of special vehicles carrying flammable substances such as oil or gas, it is necessary to install a fire protection device.

Until now, the vehicle fire prevention device has been focused on eliminating the cause of the vehicle fire by minimizing the main power supply of the vehicle in the event of a vehicle crash or short circuit. In addition, when the driver is inadvertently turned off the vehicle engine for a long time while the load parts such as headlights, taillights, and interior lights are turned on, the main power supply of the vehicle is completely discharged, or the electric wires are deteriorated due to deterioration of the wiring or the connector due to deterioration of the vehicle. This occurs frequently when the main power supply of the vehicle is completely discharged. In such a case, it is difficult to restart the vehicle without recharging the main power with the help of another vehicle or replacing it with a new main power. Therefore, it is urgently required to cut off the main power before the full discharge of the main power.

However, the conventional methods have a problem in that the main power is cut off to prevent the complete discharge of the vehicle fire or the main power, so that the brake power handle and the emergency light, which are the minimum devices necessary for the safe driving of the vehicle, do not work together.

Accordingly, the present invention is to provide a power supply device for preventing vehicle fires to operate the minimum load parts required for safe driving of the vehicle while preventing vehicle fires when a vehicle collision or short circuit accident occurs.

Another object of the present invention is to provide a power supply device for vehicle fire prevention to prevent the complete discharge of the main power in normal vehicle collision or short circuit accident does not occur.

1 is a block circuit diagram showing a power supply device for preventing vehicle fire according to the present invention.

Figure 2 is a detailed block diagram showing the fire protection of Figure 1;

Figure 3 is a waveform diagram showing the current at engine startup flowing through the fire protection of Figure 1;

4 is a waveform diagram illustrating a voltage at engine start applied to the fire protection unit of FIG. 1.

FIG. 5 is a waveform diagram illustrating a collision input signal and a voltage of the fire protection unit of FIG. 1; FIG.

Figure 6 is a flow chart of the operation of the power supply for vehicle fire prevention according to the present invention.

Power supply device for vehicle fire prevention according to the present invention for achieving the above object

A first load part and a second load part necessary for the safe driving of the vehicle at least;

A main power supply unit supplying main power to the first and second load units;

An auxiliary power supply for supplying auxiliary power;

If it is determined that the voltage of the main power supply is lower than the predetermined voltage value, it characterized in that it comprises a fire protection unit to cut off the main power supply to supply the auxiliary power only to the second load to prevent vehicle fire.

Preferably the fire protection unit

A voltage sensing unit sensing a voltage of the main power supply;

Collision detection unit for detecting a vehicle crash;

A main power cut-off unit for cutting off the main power;

A controller for controlling the main power cut-off unit to cut off the main power based on a detection result of the voltage sensing unit; And

It may include a power supply for supplying the power required to the control unit when the main power is cut off.

In addition, the main power cut-off unit may be composed of at least one parallel connected MOSFET, the gates of the parallel connected MOSFET may be integrated into one.

The power supply unit preferably includes a fast response diode therein to ensure a stable power supply from the main power supply.

A diode disposed between the main power supply unit and the auxiliary power supply unit to supply the auxiliary power to the second load unit only when the main power is cut off, and to supply the main power supply to the auxiliary power supply unit for charging the auxiliary power supply unit. Can be.

Hereinafter, a power supply device for preventing a vehicle fire according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block circuit diagram showing a power supply device for preventing vehicle fire according to the present invention, Figure 2 is a detailed block diagram showing the fire protection of FIG.

Referring to FIG. 1, in the power supply apparatus of the present invention, the first load unit 10 and the second load unit 20 are connected in parallel. The first load unit 10 includes load parts such as the headlamp 11 and the wiper 13 that are not necessary for safe driving even when the main power is cut off while driving the vehicle, and the second load unit 20 is used when driving the vehicle. Even if the main power is cut off, it is composed of load parts such as the brake 21, the power handle 23, and the emergency light 23 which are the minimum devices necessary for safe driving. The main power supply unit 30 supplies the main power supply to the first and second load units 10 and 20 together, and the fire protection unit 40 is disposed at the ground end of the main power supply unit 30 to prevent vehicle fire. The main power is cut off, and the auxiliary power supply unit 50 is connected to the second load unit 20 and supplies auxiliary power to the second load unit 20 when the main power supply unit 30 is blocked. When the diode 60 is disposed between the main power supply unit 30 and the auxiliary power supply unit 50 and the main power is not cut off, the main power is cut off without supplying the auxiliary power of the auxiliary power supply unit 50 to the second load unit 20. In this case, the auxiliary power can be supplied only to the second load unit 20. The main power supply unit 30 is composed of a main battery 31 and the generator 33.

In the fire protection unit 40, as shown in FIG. 2, the voltage detection unit 110 detects the voltage of the main power supply unit 30 to detect the electric short circuit of the vehicle, and detects a collision such as the airbag control unit 120 The unit 120 is disposed outside the fire protection unit 40 to detect a vehicle collision, and the control unit 100 inputs through a detection signal of the voltage detecting unit 110 and a communication port 130 such as a CAN communication unit. By controlling the main power cut-off unit 150 based on the detection signal from the collision detection unit 120 is cut off the power supply from the main battery 31 and the generator 33 which is the DC power of the main power supply 30 Control to display the cut-off state of the main power supply unit 30 on the display unit 140 via the communication port 130. In addition, the control unit 100 transmits the sensed voltage value from the voltage detecting unit 110 to the control units for controlling the respective parts of the vehicle, such as the ABS, ECU, including the airbag control unit 120 via the communication port 130. Or receive data from these controls. The first power supply unit 160 supplies operating power to the control unit 100, and when the second power supply unit 170 cuts off the main power supply unit 30, the first power supply unit 160 assists the first power supply unit 160 to supply operating power to the control unit 100. Supply. As the second power supply unit 170, a secondary battery such as a nickel-cadmium rechargeable battery pack may be used. The second power supply unit 170 is connected to the main power supply unit 30 through a relay (not shown), thereby being charged by the main power supply unit 30 in a state where there is no interruption of the main power supply. This can prevent a decrease in the supply capacity of the auxiliary power supply due to self discharge. On the other hand, since the power of the fire protection unit 40 supplied from the main power supply unit 30 may cause voltage fluctuation due to the influence of other parts in the vehicle, a high-speed response diode 161 to ensure a stable power supply to prepare for this problem. ) Is disposed in the first power supply unit 160.

Here, the main power cutoff unit 150 is disposed close to the main power cutoff unit 30 in order to maximize the main power cutoff effect. That is, by allowing all terminals of the main power supply unit 30 to pass through the main power cutoff unit 150, it is possible to eliminate the possibility of other short circuits except for an electric short circuit caused by self-destruction of the main power cutoff unit 150. As the main power cut-off unit 150, a metal oxide semiconductor field effect transistor (MOSFET) module including a plurality of MOSFETs 151 may be used. Each MOSFET 151 is a high-speed switching device, the switching speed is about 516ns off time, the main power can be cut off within about 0.001 seconds, and the electrical switching makes almost no noise generated by mechanical switching and reliability. Very high. In the MOSFET module, a plurality of MOSFETs 151 are connected in parallel. This is to maintain the high-speed switching operation by the MOSFET module because the other MOSFET operates normally even if one MOSFET malfunctions due to a failure or the like. Moreover, in order to simultaneously control a plurality of MOSFETs 151 connected in parallel, the gate parts of the plurality of MOSFETs 151 are manufactured by integrating them into one, and copper terminals are manufactured by the copper terminals for the same heat dissipation and signal flow. It is preferable to use.

MOSFET 151 can continuously flow a current of 180 A at a temperature of 25 ° C., has a withstand voltage of 2.5 KV, a voltage of 0.0065 Ω when the gate-source voltage (Vgs) is 10 V and the drain continuous current (Id) is 108 A. Has a drain-source resistance Rds. As shown in FIG. 2, six MOSFETs 151 are connected in parallel to accommodate a current of about 420 A which flows at the start of a typical vehicle engine. If the drain-source resistance (Rds) is 0.0013Ω and the current of 420A flows at the start of the vehicle engine, a voltage drop of 0.546V occurs. In cases where a large large current must be applied, such as when starting a diesel vehicle, or when the voltage drop caused by the MOSFET is further reduced, it is necessary to connect more than six MOSFETs in parallel.

When driving a starting motor (not shown) to start the vehicle engine, as shown in FIG. 3, a current of up to 412 A flows through the main power cut-off unit 150, and as shown in FIG. 4, about 0.5V. The voltage drop of the main power cut-off unit 150 occurs. As shown in FIG. 5, the off trigger signal of the main power cut-off unit 150 measured at the vehicle body terminal side has a time of 20 μs from the moment of triggering the off signal, and the switching of the MOSFET 151 starts, resulting in a rise time of 40 μs. As a result, off delay time of about 60μs is generated.

Referring to FIG. 6, the operation of the power supply device for preventing a vehicle fire configured as described above, first, in step S10, a driver (not shown) drives a starting motor (not shown) of a vehicle (not shown). After starting the vehicle engine, the voltage detection unit 110 of the fire protection unit 40 detects the main power supply voltage of the main power supply unit 30 and sends the detected voltage value to the control unit 100.

At this time, short circuit of electric wiring occurs due to deterioration of electric wiring or defect of plastic connector connecting electric wiring in the state that there is no vehicle collision, resulting in vehicle fire or vehicle crash due to short circuit. In a state in which damage occurs, flammable substances such as gasoline or engine oil flow out from a device such as an engine, resulting in short circuits with various electrical wirings or connectors, or vehicle fires caused by flammable substances ignited due to sparks. When this happens, the detected voltage value from the voltage detector 110 is lower than the preset voltage value.

In step S20, when the control unit 100 receives a collision signal from the collision detection unit such as an external airbag controller 120 through the communication port 130 and determines that the vehicle is larger than the preset vehicle collision size, the main power supply is blocked. Step S50 is performed quickly.

When it is determined that the vehicle collision size is smaller than the preset vehicle collision size, it is compared in step S40 whether the main power voltage of the main power supply unit 30 is smaller than the preset voltage value corresponding to the main power cutoff criterion. At this time, when an electric short circuit occurs in the vehicle due to a vehicle collision and the main power supply voltage of the main power supply unit 30 decreases, the possibility of vehicle fire is increased. Therefore, it is determined that the main power supply voltage of the main power supply unit 30 is lower than the preset voltage value. When the control unit 100 controls the main power cut-off unit 150 in step S50, the main power supply unit 30 quickly cuts off the main power supply from the main battery 31 and the generator 33. ) To display the cut-off state on the display unit 140 so that the driver can easily check the discharge or short circuit of the main power and take appropriate measures necessary for this.

Similarly, even in a case where there is a possibility that a short circuit of the electrical wiring occurs due to a deterioration of the electrical wiring or a defect of the plastic connector connecting the electrical wiring in a state where a vehicle collision does not occur, and a short circuit may cause a vehicle fire, Since it is determined that the main power supply voltage of the main power supply unit 30 is smaller than the preset voltage value, the main power supply is cut off in step 50. Therefore, the present invention can prevent the vehicle fire in advance by quickly shutting off the main power supply of the main power supply even when an electric short circuit occurs due to a vehicle collision as well as a natural electric short circuit occurs.

In order to return from the main power disconnection state to the main power connection state, the reset signal can be returned from the main power disconnection state to the main power connection state by sending a reset signal through the communication port by using an external device (ie, a driver's control device, etc.).

If it is determined that the main power voltage of the main power supply unit 30 is greater than the predetermined voltage value corresponding to the main power cutoff standard, the control unit 100 controls the main power cutoff unit 150 to block the main power supply in step S60. Do not At this time, the generator 31 of the main power supply unit 30 charges the auxiliary power supply unit 50.

After the main power supply of the main power supply unit 30 is cut off and the supply of the main power supply of the first power supply unit 160 to the control unit 100 is also blocked, the second power supply unit 170 such as a nickel-cadmium rechargeable battery pack is removed in step S70. The auxiliary power supply may be supplied to the control unit 100 by assisting the first power supply unit 160 to continuously maintain the operation of the control unit 100. Charging the second charging unit 170 by connecting the second power supply unit 170 to the main power supply unit 30 using a relay (not shown) in order to prevent a decrease in power supply capability due to self discharge of the second power supply unit 170. This is done. In addition, the first load unit 10, such as the headlight 11 and the wiper 13, which are not necessary for safe driving when driving the vehicle, the brake 21 and the power handle, which are the minimum devices necessary for safe driving while driving the vehicle, Unlike the prior art in which the second load unit 20 such as the emergency light 23 and the emergency light 23 are not driven, the auxiliary power of the auxiliary power supply unit 50 is removed from the second load unit 10 except for the first load unit 10. Supply only to the load unit 20 to enable safe driving of the vehicle. This is because the diode 60 is disposed between the main power supply unit 30 and the auxiliary power supply unit 50, so that the auxiliary power supply of the auxiliary power supply unit 50 is the second load unit 20 when the main power supply of the main power supply unit 30 is not cut off. This is because the auxiliary power of the auxiliary power supply unit 50 may be supplied to the second load unit 20 when the main power of the main power supply unit 30 is cut off. In addition, when the auxiliary power supply unit 50 is lowered due to self discharge, the main power supply unit 30 is charged through the diode 60.

On the other hand, the driver inadvertently operates the first load unit 10 such as the headlight 11, the wiper 13, the taillight, and the interior light of FIG. By leaving it off for a long time, the main power of the vehicle is discharged, or a short circuit occurs due to deterioration of electrical wiring or a defective connector due to the deterioration of the vehicle, thereby discharging the main power of the vehicle. When this happens, when the discharge of the main power to some extent, the sensed voltage value from the voltage sensing unit 110 is lower than the preset voltage value, due to the discharge of the main power supply unit 30 in step S40 If it is determined that the main power supply voltage of the main power supply unit 30 is lower than the preset voltage value, the main power supply is cut off at step S50.

Therefore, the present invention can prevent the complete discharge of the main power supply unit 30 in the absence of electric short circuit or collision accident of the vehicle.

As described above, the power supply device for preventing vehicle fire according to the present invention has a structure in which a fire protection unit and an auxiliary power supply unit are additionally installed in a conventional vehicle having a main power supply unit, and detects a main power supply voltage of a running vehicle. By detecting a collision, it is determined whether the main power supply voltage at the time of a vehicle collision and an electric short circuit is lower than a preset voltage value. If it is determined that the main power supply voltage is lower than the preset voltage value, an electrical short circuit occurs due to a vehicle accident, so the main power supply is quickly cut off to prevent the vehicle fire. When the main power is cut off, only the auxiliary power is supplied to the vehicle to keep the minimum number of devices necessary for safe operation of the vehicle, such as brakes, power handles, and emergency lights, but not the rest. If it is determined that the main power voltage is higher than the preset voltage value, the main power is not shut off and the auxiliary power is charged using the main power. In addition, when the main power is discharged due to a natural electric short circuit during a normal non-car accident, if the main power voltage is detected in the same way and the main power voltage is determined to be lower than the preset voltage value, the main power is prevented from being completely discharged. The main power is disconnected quickly to On the other hand, the fire protection unit uses a MOSFET having a fast switching characteristics for the rapid shutdown of the main power supply, and uses a plurality of parallel connected MOSFETs to ensure the operation stability.

Therefore, the present invention operates the minimum apparatus necessary for the safe operation of the vehicle while preventing the vehicle fire in the event of a vehicle collision and an electrical short circuit, and prevents the full discharge of the main power supply in normal times.

On the other hand, the present invention is not limited to the contents described in the drawings and detailed description, it is obvious to those skilled in the art that various modifications can be made without departing from the spirit of the invention. .

Claims (6)

A first load part and a second load part necessary for the safe driving of the vehicle at least; A main power supply unit supplying main power to the first and second load units; An auxiliary power supply for supplying auxiliary power; If it is determined that the voltage of the main power supply is lower than a predetermined voltage value, to prevent the vehicle fire, the fire protection unit for blocking the main power supply and supplying the auxiliary power only to the second load portion for the vehicle fire prevention Power supply. According to claim 1, wherein the fire protection unit A voltage sensing unit sensing a voltage of the main power supply; A main power cut-off unit for cutting off the main power; A controller for controlling the main power cut-off unit to cut off the main power based on a detection result of the voltage sensing unit; And And a power supply unit for supplying power to the control unit when the main power is cut off. 3. The power supply device for vehicle fire prevention according to claim 2, wherein the main power cut-off part comprises at least one parallel-connected MOSFET. 4. The power supply for vehicle fire protection according to claim 3, wherein the gates of the parallel-connected MOSFETs are integrated into one. The power supply device for vehicle fire prevention according to claim 2, wherein the power supply unit includes a high-speed response diode therein to ensure a stable power supply from the main power supply. The auxiliary power supply of claim 1, wherein the auxiliary power is supplied only to the second load part when the main power is cut off, and the main power is normally supplied to the auxiliary power supply to charge the auxiliary power supply. Power supply for vehicle fire prevention, comprising a diode for supplying.