JP2022115152A - On-vehicle emergency power supply and vehicle mounted with on-vehicle emergency power supply - Google Patents

Abstract

To easily determine whether or not a vehicle is in a safe state.SOLUTION: An on-vehicle emergency power supply 1 comprises: an input end 2; a detection signal reception unit 4; an emergency signal reception unit 5 which can receive an emergency signal; a signal transmission unit 6 which can transmit a shutdown completion signal; a power storage element 7; a discharge circuit 8 which can discharge the power stored in the power storage element 7; and a control unit 9 which enables the reception from the detection signal reception unit 4, the control of the operation to the discharge circuit 8, the detection of the emergency signal from the emergency signal reception unit 5 and the transmission of the shutdown completion signal from the signal transmission unit 6. The control unit 9 enables the transmission of the shutdown completion signal when the drive current when receiving the emergency signal is smaller than a threshold.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an in-vehicle emergency power supply device used in various vehicles and a vehicle equipped with the in-vehicle emergency power supply device.

A conventional vehicle power supply device will be described below. A conventional vehicle power supply device has a function of forcibly cutting off power supply from a vehicle propulsion drive battery to a vehicle drive load when an unexpected situation occurs in the vehicle. Here, as a means for forcibly cutting off the power supply, generally, a fuse, a relay, or the like, which cuts off conduction by blowing, is used.

For example, Patent Document 1 is known as prior art document information related to the invention of this application.

JP 2011-25912 A

However, in a conventional vehicle power supply, even if the vehicle power supply performs an operation to forcibly cut off the power supply to a fuse or a relay, an unexpected situation may occur in the vehicle. In some cases, such as when the vehicular power supply device is damaged as a result of the occurrence, it may not be possible to determine whether or not the above-described forced cutoff of the power supply has been completed. For this reason, there is a problem that a worker who performs rescue work from outside the vehicle cannot determine whether or not the vehicle, particularly the vehicle propulsion drive battery, is secured in a safe state.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to easily determine whether or not the power supply is cut off.

In order to achieve this object, the present invention provides a current detection signal corresponding to a drive current flowing through an input terminal connected to a vehicle battery and a power supply line connecting a vehicle propulsion battery and a vehicle drive load. an emergency signal receiving unit capable of receiving an emergency signal; a signal transmitting unit capable of transmitting an interruption completion signal; receiving the current detection signal from the detection signal receiving section; controlling the operation of the discharging circuit; detecting the emergency signal from the emergency signal receiving section; a control unit capable of transmitting a cut-off completion signal, wherein the control unit transmits the cut-off completion signal when the drive current when the emergency signal is received is smaller than a threshold; It is characterized by

According to the present invention, it is possible to easily determine whether or not the vehicle is in a safe state, and to respond to rescue from the outside of the vehicle after correctly recognizing the state of the vehicle.

FIG. 1 is a first circuit block diagram showing the configuration of an in-vehicle emergency power supply device according to an embodiment of the present invention; FIG. 2 is a second circuit block diagram showing the configuration of an in-vehicle emergency power supply device according to an embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a circuit block diagram showing the configuration of an in-vehicle emergency power supply device 1 according to an embodiment of the present invention. Vehicle-mounted emergency power supply device 1 includes an input terminal 2 , an output terminal 3 , a detection signal receiver 4 , an emergency signal receiver 5 , a signal transmitter 6 , a storage element 7 , a discharge circuit 8 , and a controller 9 .

The input terminal 2 is connected to the vehicle battery 10 . The output 3 is connected to a vehicle load 11 . The detection signal receiving unit 4 receives a current detection signal S1 corresponding to the drive current I1 flowing through the power supply path 14 connecting the vehicle propulsion drive battery 12 and the vehicle drive load 13 . The emergency signal receiver 5 can receive the emergency signal S2. The signal transmission unit 6 can transmit a cutoff completion signal S3. The storage element 7 is connected to the discharge circuit 8 . The discharge circuit 8 can discharge the electric power stored in the storage element 7 .

The controller 9 receives the current detection signal S1 input to the detection signal receiver 4 . Also, the control unit 9 can control the operation of the discharge circuit 8 . Furthermore, the control section 9 can receive and detect the emergency signal S2 input to the emergency signal receiving section 5 . Furthermore, the control unit 9 can cause the signal transmission unit 6 to transmit a cutoff completion signal S3.

When the controller 9 receives the emergency signal S2 through the emergency signal receiver 5, the drive current I1 corresponding to the current detection signal S1 detected through the detection signal receiver 4 is smaller than the drive current threshold value Ith. If so, the signal transmitting unit 6 is caused to transmit a cutoff completion signal S3.

With the above configuration and operation, the on-vehicle emergency power supply device 1 detects the emergency signal S2 transmitted from the vehicle 15 when the vehicle 15 encounters an unexpected situation such as an accident. It is possible to determine whether or not the power supply line 14 connecting the vehicle drive load 13 is cut off, and the signal transmission unit 6 can transmit the cut-off completion signal S3. As a result, it is possible to easily determine whether the vehicle 15 is in a safe state based on the cut-off completion signal S3. It becomes possible.

Details of the vehicle emergency power supply device 1 will be described below with reference to the second circuit block diagram of FIG. 2 showing the configuration of the vehicle emergency power supply device according to the embodiment of the present invention. The in-vehicle emergency power supply device 1 is arranged on a vehicle body 16 of a vehicle 15 . A vehicle body 16 is equipped with an in-vehicle emergency power supply 1 , a vehicle battery 10 , a vehicle load 11 , a vehicle propulsion drive battery 12 , and a vehicle drive load 13 .

The vehicle battery 10 is a storage battery corresponding to an auxiliary battery, and is capable of outputting a DC voltage of 12 V, 24 V, or the like in a normal state. The vehicle drive load 13 is a load driven by the vehicle battery 10, and includes general electrical components such as a car navigation system (not shown), a lighting device (not shown), and the like for locking and unlocking doors. motor (not shown) corresponds to. Further, electric power for operating a vehicle body control unit 17 that is provided in the vehicle body 16 and executes control of the entire vehicle 15 may be supplied from the vehicle battery 10 . In-vehicle emergency power supply 1 can supply power to vehicle 15 and vehicle load 11 that operates to ensure the safety of passengers, particularly when vehicle battery 10 fails.

The vehicle propulsion drive battery 12 is a storage battery for supplying electric power to a vehicle drive load 13 of an electric vehicle or a hybrid vehicle, and is capable of outputting a DC voltage of 500V or the like in a normal state. The vehicle drive load 13 corresponds to an inverter device (not shown) that converts DC power into AC power and a vehicle propulsion motor (not shown).

A current detector 18 is provided in the power supply path 14 that connects the vehicle propulsion drive battery 12 and the vehicle drive load 13 . A Hall element is used for the current detection unit 18, and the Hall element preferably transmits a voltage corresponding to the value of the drive current I1 flowing through the power supply path 14 as the current detection signal S1. Alternatively, a shunt resistor may be used in the current detection unit 18, and a voltage based on the potential difference between both ends of the shunt resistor may be transmitted as the current detection signal S1 according to the value of the drive current I1 flowing through the power supply path 14. .

Also, the current detection unit 18 may transmit the cutoff signal S<b>0 to the cutoff unit 19 . Alternatively, the current detection control circuit 18A provided in the current detection section 18 may transmit the cutoff signal S0 to the cutoff section 19. FIG. Here, the cutoff signal S0 is a signal for causing the cutoff section 19 to cut off the power supply path 14 by the current detection control circuit 18A. The current detection unit 18 and the cutoff unit 19 are connected in series with the power supply line 14, and the current detection unit 18 cuts off the power supply line 14 when the current detection control circuit 18A detects an abnormal current. Signal S0 should be emitted. Here, the current detection signal S1, which is a signal corresponding to the value of the current flowing through the current detection unit 18, and the cutoff signal S0 are different signals. Alternatively, the vehicle body control unit 17 may transmit a cutoff signal S0 for cutting off the power supply path 14 to the cutoff unit 19 based on an abnormality in the vehicle 15 . A relay, a pyrotechnic switch, or the like may be applied to the breaker 19 .

The in-vehicle emergency power supply device 1 can store electric power supplied from the vehicle battery 10 in the storage element 7 and supply the electric power to the vehicle load 11 in an emergency. Power is normally supplied from the vehicle battery 10 to the vehicle load 11 through the normal supply line 20 . Power is supplied from the in-vehicle emergency power supply 1 to the vehicle load 11 when the vehicle battery 10 is damaged or the normal supply line 20 is damaged due to some unforeseen event. . In other words, when the vehicle battery 10 and the normal supply line 20 are normal, the storage element 7 can be charged using the power of the vehicle battery 10 . The electric storage element 7 may be charged directly from the vehicle battery 10, or the electric power of the vehicle battery 10 may be DCDC converted by the discharge circuit 8 operating as a charging/discharging circuit having a charging function. The discharge circuit 8 may charge the storage element 7 .

The control unit 9 of the in-vehicle emergency power supply device 1 is connected to the detection signal reception unit 4, and when the vehicle 15 is started, the control unit 9 always receives the current detection signal S1 transmitted from the current detection unit 18. It receives and detects the driving current I1 flowing through the power supply path 14 .

Here, when it is detected that the vehicle 15 has encountered an abnormal situation such as a collision accident, or when the vehicle 15 detects a state where a large amount of electric power may leak or an electric leakage state is detected. When the controller 9 receives the emergency signal S2 through the emergency signal receiver 5, the controller 9 compares the drive current I1 corresponding to the current detection signal S1 with the drive current threshold Ith. As for the operation of the control section 9, the control section 9 first obtains the value of the drive current I1 from the voltage value of the current detection signal S1. Then, the drive current I1 and the drive current threshold Ith are compared. Then, when the controller 9 determines that the drive current I1 is smaller than the drive current threshold Ith, the controller 9 causes the signal transmitter 6 to transmit a cutoff completion signal S3. Here, the driving current threshold value Ith may be set to a low level current value that does not endanger the rescue worker. In other words, the interruption completion signal S3 is sent from the control section 9 when no abnormal current is flowing through the current detection section 18, and the interruption by the interruption section 19 is properly executed. corresponds to

The above-described emergency signal S2 may be sent from the vehicle body control unit 17 when the vehicle 15 encounters a collision accident or other abnormal situation. Alternatively, the emergency signal S2 may be a cutoff signal S0 that is issued to the cutoff unit 19 to cut off the power supply path 14 when the current detection control circuit 18A detects an abnormal current. Alternatively, the vehicle body control section 17 may transmit the emergency signal S2 to the control section 9 in response to the vehicle body control section 17 receiving the cutoff signal S0 transmitted by the current detection control circuit 18A. .

Therefore, the control unit 9 confirms that the driving current I1 is cut off by an instruction from the vehicle body control unit 17 or the current detection control circuit 18A by means of the current detection signal S1, which is a signal different from the cutoff signal S0 and the emergency signal S2. . Then, it is preferable that the control section 9 transmits a cutoff completion signal S3 to the state recognition section 21 to operate the state recognition section 21 .

The state recognition unit 21 may be an indicator lamp or a display that is provided in the vehicle 15 and visible to a rescuer from the outside of the vehicle 15 . Alternatively, the state recognition unit 21 may be a terminal device provided outside the vehicle 15 and possessed by a rescuer who receives the cutoff completion signal S3 as a radio wave signal.

As a result, when the vehicle 15 encounters an unexpected situation such as an accident and detects an emergency signal S2 transmitted from the vehicle 15, the vehicle propulsion drive battery 12 and the vehicle drive load 13 are switched off. It is possible to determine whether or not the power supply path 14 connecting to is in a cut-off state, and it is possible to cause the signal transmission unit 6 to transmit a cut-off completion signal S3.

In other words, the emergency signal S2 is transmitted from the vehicle 15 to the controller 9 in response to the occurrence of an abnormality in the vehicle 15 . The disconnection completion signal S3 is transmitted from the control unit 9 to the vehicle 15 in response to the normal disconnection between the vehicle propulsion drive battery 12 and the vehicle drive load 13 . As a result, a rescuer or the like can easily determine whether or not the vehicle 15 is in a safe state based on the shutoff completion signal S3. can be handled.

Further, in the in-vehicle emergency power supply device 1, signal reception and transmission as well as operation of the control unit 9 and the discharge circuit 8 are possible with the electric power of the storage element 7. The on-vehicle emergency power supply device 1 can continue to operate even in the event of a failure. In addition to the above-described signal reception and transmission, the on-vehicle emergency power supply device 1 secures the safety of the vehicle 15 and passengers in an emergency or when the vehicle battery 10 fails, as described above. Electric power can be supplied to the vehicle load 11 that operates for the purpose. Here, it is preferable to use an electric double layer capacitor or a lithium ion capacitor capable of supplying a large amount of power in a short time as the storage element 7 .

As for the operation sequence of the control unit 9 described above, first, when the control unit 9 receives an emergency signal S2, which is transmitted when the vehicle 15 encounters a collision accident or other abnormal situation, through the emergency signal receiving unit 5. Then, the control unit 9 compares the drive current I1 corresponding to the current detection signal S1 with the drive current threshold Ith. Next, when the control unit 9 determines that the drive current I1 is smaller than the drive current threshold value Ith, the control unit 9 causes the signal transmission unit 6 to transmit the cutoff completion signal S3. Here, in order to perform the above-described determination operation more accurately, after a predetermined time has passed after the control unit 9 receives the emergency signal S2, the control unit 9 outputs the drive current I1 corresponding to the current detection signal S1. It is preferable to detect and compare the driving current I1 with the driving current threshold Ith.

Here, the predetermined time is a value longer than the shutoff completion time from when the shutoff signal S0 or the emergency signal S2 is issued to the shutoff unit 19 to when the shutoff unit 19 completes shutoff when the shutoff unit 19 operates normally. should be As a result, the on-vehicle emergency power supply device 1 detects an emergency signal S2 transmitted from the vehicle 15 when the vehicle 15 encounters an unexpected situation such as an accident, and the vehicle propulsion drive battery 12 and the vehicle drive load 13 are connected to each other. It is possible to determine whether or not the power supply line 14 connecting the can.

In the above description, the in-vehicle emergency power supply device 1 transmits the interruption completion signal S3 when the current from the vehicle propulsion drive battery 12 is interrupted when the vehicle 15 encounters an unexpected situation such as an accident. explained. On the other hand, when the vehicle 15 encounters an unexpected situation such as an accident, the in-vehicle emergency power supply device 1 transmits an incomplete cutoff signal S4 if the current from the vehicle propulsion drive battery 12 is not cut off. It may be in the form of

The operation in this case is as follows. When the control unit 9 receives an emergency signal S2 transmitted when the vehicle 15 encounters a collision accident or other abnormal situation through the emergency signal receiving unit 5, the control unit 9 detects the drive current corresponding to the current detection signal S1. A comparison between I1 and the drive current threshold Ith is performed. As for the operation of the control section 9, the control section 9 first obtains the value of the drive current I1 from the voltage value of the current detection signal S1. Then, the drive current I1 and the drive current threshold Ith are compared. When the controller 9 determines that the drive current I1 is equal to or greater than the drive current threshold value Ith, the controller 9 causes the signal transmitter 6 to transmit an incomplete cutoff signal S4. Here, the drive current threshold value Ith may be set to a current value that may pose a danger to the rescue worker. In other words, the incomplete cutoff signal S4 is sent from the control unit 9 when an abnormal current is flowing through the current detection unit 18, and the cutoff unit 19 is not properly cut off. Corresponds to state.

In other words, the emergency signal S2 is transmitted from the vehicle 15 to the controller 9 in response to the occurrence of an abnormality in the vehicle 15 . The incomplete disconnection signal S4 is transmitted from the control unit 9 to the vehicle 15 in response to the fact that the disconnection between the vehicle propulsion drive battery 12 and the vehicle drive load 13 is not normally performed. As a result, the on-vehicle emergency power supply device 1 detects the emergency signal S2 transmitted from the vehicle 15 when the vehicle 15 encounters an unexpected situation such as an accident. It is possible to determine whether or not the power supply path 14 connecting to is in a cut-off state, and it is possible to cause the signal transmission unit 6 to transmit an incomplete cut-off signal S4. As a result, a rescuer or the like can easily determine whether the vehicle 15 is in a safe state based on the cut-off incomplete signal S4, and a rescuer from the outside of the vehicle 15 can correctly recognize the vehicle state. It is possible to deal with it.

In the embodiments described above, the cutoff signal S0, the current detection signal S1, the emergency signal S2, the cutoff complete signal S3, and the cutoff incomplete signal S4 may be analog signals or encoded signals. Also, although these are described as transmission and reception, they may also be referred to as output and input.

Further, the detection signal receiving unit 4, the emergency signal receiving unit 5, and the signal transmitting unit 6 are described as individual elements provided in the vehicle-mounted emergency power supply device 1, but the detection signal receiving unit 4 and the emergency signal receiving unit 5. The signal transmitter 6 may be provided in the controller 9 .

INDUSTRIAL APPLICABILITY The in-vehicle emergency power supply device and the vehicle equipped with the in-vehicle emergency power supply device of the present invention have the effect of making it possible to easily determine whether the vehicle is in a safe state, and are useful in various vehicles. be.

REFERENCE SIGNS LIST 1 on-vehicle emergency power supply device 2 input terminal 3 output terminal 4 detection signal receiver 5 emergency signal receiver 6 signal transmitter 7 power storage element 8 discharge circuit 9 controller 10 vehicle battery 11 vehicle load 12 vehicle propulsion drive battery 13 vehicle Driving load 14 Power supply path 15 Vehicle 16 Vehicle body 17 Vehicle control unit 18 Current detection unit 18A Current detection control circuit 19 Breaker unit 20 Normal supply path 21 State recognition unit

Claims (7)

an input end connected to a vehicle battery;
a detection signal receiver that receives a current detection signal corresponding to a drive current flowing in a power supply path that connects a vehicle propulsion drive battery and a vehicle drive load;
an emergency signal receiver capable of receiving an emergency signal;
a signal transmission unit capable of transmitting a cutoff completion signal;
a storage element;
a discharge circuit capable of discharging the power stored in the storage element;
Reception of the current detection signal from the detection signal reception section, control of the operation of the discharge circuit, detection of the emergency signal from the emergency signal reception section, and transmission of the shutdown completion signal from the signal transmission section. a control unit capable of
with
The control unit transmits the shutdown completion signal when the drive current when the emergency signal is received is smaller than a threshold.
In-vehicle emergency power supply. the emergency signal is transmitted from the vehicle in response to an abnormality occurring in the vehicle equipped with the in-vehicle emergency power supply device;
The disconnection completion signal is transmitted to the vehicle in response to normal disconnection between the vehicle propulsion drive battery and the vehicle drive load.
The in-vehicle emergency power supply device according to claim 1. a vehicle body;
a vehicle battery,
vehicle load;
a vehicle propulsion drive battery;
a vehicle drive load;
a vehicle body control unit capable of detecting an abnormality in the vehicle body and transmitting an emergency signal when an abnormality is detected;
a current detection unit provided in a path from the vehicle propulsion drive battery to the vehicle drive load;
an input terminal connected to the vehicle battery, an output terminal connected to the vehicle load, a detection signal receiving section for receiving a current detection signal generated from the current detection section, and an emergency capable of receiving the emergency signal. a signal receiving unit, a signal transmitting unit capable of transmitting a cutoff completion signal, a power storage element, a discharge circuit capable of discharging power stored in the power storage element, and the current detection from the detection signal receiving unit a control unit capable of receiving a signal, controlling the operation of the discharge circuit, detecting the emergency signal from the emergency signal receiving unit, and transmitting the shutdown completion signal from the signal transmitting unit; an in-vehicle emergency power supply device having
with
The control unit transmits the shutdown completion signal when the drive current when the emergency signal is received is smaller than a threshold.
vehicle. a vehicle body;
a vehicle battery,
vehicle load;
a vehicle propulsion drive battery;
a vehicle drive load;
a breaker provided in a path from the vehicle propulsion drive battery to the vehicle drive load;
a current detection unit connected in series to the breaking unit and transmitting a breaking signal for breaking the breaking unit when an abnormal current is detected;
an input terminal connected to the vehicle battery; an output terminal connected to the vehicle load; a detection signal receiver for receiving a current detection signal generated from the current detector; a signal receiving unit, a signal transmitting unit capable of transmitting a cutoff completion signal, a power storage element, a discharge circuit capable of discharging power stored in the power storage element, and the current detection from the detection signal receiving unit a control unit capable of receiving a signal, controlling the operation of the discharge circuit, detecting the cutoff signal from the emergency signal receiving unit, and transmitting the cutoff completion signal from the signal transmitting unit; an in-vehicle emergency power supply device having
with
The control unit transmits the cut-off completion signal when the drive current when the cut-off signal is received is smaller than a threshold.
vehicle. The control unit transmits the cut-off completion signal when the drive current after a predetermined time from receiving the cut-off signal is smaller than a threshold.
A vehicle according to claim 4 . an input end connected to a vehicle battery;
a detection signal receiver that receives a current detection signal corresponding to a drive current flowing in a power supply path that connects a vehicle propulsion drive battery and a vehicle drive load;
an emergency signal receiver capable of receiving an emergency signal;
a signal transmission unit capable of transmitting an incomplete cutoff signal;
a storage element;
a discharge circuit capable of discharging the power stored in the storage element;
Reception of the current detection signal from the detection signal reception section, control of the operation of the discharge circuit, detection of the emergency signal from the emergency signal reception section, and transmission of the incomplete shutdown signal from the signal transmission section. a control unit capable of causing
with
The control unit
When the drive current when the emergency signal is received is equal to or greater than a threshold, the incomplete shutdown signal is transmitted;
In-vehicle emergency power supply. The emergency signal is transmitted from the vehicle in response to an abnormality occurring in the vehicle equipped with the in-vehicle emergency power supply device,
The disconnection completion signal is transmitted to the vehicle in response to the fact that disconnection between the vehicle propulsion drive battery and the vehicle drive load is not normally performed.
The in-vehicle emergency power supply device according to claim 6.

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