JPH05319184A - Power supply voltage switching device for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to alert the driver of the failure of the switch for connecting the power supply voltage and the switch for connecting the power supply and the load, and to prevent the battery from rising. [Constitution] The contacts 3a to 3c and the switch 7 are driven by a controller 9 to connect and charge the batteries 1a and 1b in parallel, and when connected in series, power is supplied to the large power load 8. The failure of the contacts 3a to 3c and the switch 7 is detected based on the terminal voltage of the switch 7 when the control operation of the controller 9 is switched, and the control operation is performed when the failure of the contacts 3a to 3c is detected and when the open failure of the switch 7 is detected. When the switch 7 is stopped and the engine warning light 10 is turned on, and when the closing failure of the switch 7 is detected, the series connection of the batteries 1a and 1b is released to stop the power supply to the large power load 8 and turn on the engine warning light 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply voltage switching device for switching a plurality of batteries mounted in a vehicle to either parallel connection or series connection, and more particularly to a vehicle power supply voltage detecting contact failure. The present invention relates to a switching device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional vehicle power source voltage switching device. In the figure, 1a and 1b
Is a 12V on-vehicle battery, which is connected in series or in parallel via the relay 2.

The relay 2 includes a contact 3a connected to the positive terminal of the battery 1a and the positive terminal of the battery 1b, and the battery 1
Contact 3 connected to the negative terminal of a and the negative terminal of battery 1b
b, a contact 3c connected to the positive terminal of the battery 1a and the negative terminal of the battery 1b, a drive coil 4a for the contacts 3a and 3b, and a drive coil 4b for the contact 3c.

The contacts 3a to 3c are normally-off contacts, and when the coil 4a is energized and excited and the coil 4b is deenergized and demagnetized, the contacts 3a and 3b are closed and the contact 3c is opened. The batteries 1a and 1b are connected in parallel. Also, the coil 4a is de-energized and demagnetized, and the coil 4b is energized and excited, whereby the contacts 3a and 3b are opened and the contact 3 is opened.
c is closed and the batteries 1a and 1b are connected in series.

The positive terminal of the battery 1a is connected to the charger 5 and a general electric load 6 operating at 12V. When the contacts 3a and 3b are closed and the batteries 1a and 1b are connected in parallel, the positive terminal of the battery 1b is also connected to the charger 5 and the electric load 6, and the batteries 1a and 1b are both charged by the charger 5. 12V to the electric load 6
Supply power.

The positive terminal of the battery 1b is the switch 7
The large power load 8 connected to the terminal 7a of the switch 7 and operating at 24V is connected to the terminal 7b of the switch 7,
Is closed, the positive terminal of the battery 1b and the large power load 8 are connected.

Reference numeral 9 denotes a controller connected to the coils 4a and 4b, which energizes the coils 4a and 4b at an optimum timing, outputs an open / close command signal to the switch 7, and further outputs terminal voltages [A, B] of the switch 7. ]] Is detected.

The other ends of the coils 4a and 4b, the negative terminal of the battery 1a, the charger 5, the electric load 6 and the large power load 8 are grounded.

Next, the operation of the conventional example having the above-mentioned configuration will be described with reference to FIG.
Will be described. FIG. 4 is a flow chart for explaining the control operation by the controller 9. First, the controller 9 performs the charging operation of the batteries 1a and 1b in steps s1 and s2. That is, the controller 9 connects the batteries 1a and 1b in parallel by energizing the coil 4a to close the contacts 3a and 3b and deenergize the coil 4b to open the contact 3c, and the charger 5
Thus, the battery 1a and the call 1b are charged to 12V. In addition, the batteries 1a and 1b are charged and supply 12V electric power to the electric load 6.

During this time, the switch 7 is open and the batteries 1a and 1b are disconnected from the high power load 8. Therefore, since there is no power supply to the large power load 8, the large power load 8 is not driven.

Subsequently, the controller 9 operates the battery 1a.
If it is determined that the conditions for driving the large electric power load 8 are satisfied after the charging of 1 and 1b is completed, the charging stop operation is performed in steps s3 and s4. That is, the energization of the coil 4a is stopped and the contacts 3a and 3b are opened to release the parallel connection of the batteries 1a and 1b. At this time, the switch 7 is still open and the batteries 1a and 1a
b is disconnected from the large power load 8.

Subsequently, the controller 9 executes step s5.
At 24 and s6, the 24V switching operation is performed. That is, by energizing the coil 4b and closing the contact 3c, the batteries 1a and 1b are connected in series to form a 24V power source. Since the 24V power supply is formed in this manner, the switch 7 becomes operable.

Then, the controller 9 performs step s7.
And s8, the driving operation of the large power load 8 is performed. That is, the controller 9 closes the switch 7,
The batteries 1a and 1b connected in series and the large power load 8 are connected. As a result, the large power load 8 can be driven 2
Electric power of 4V is supplied to the large electric power load 8 from the batteries 1a and 1b connected in series.

After that, the controller 9 controls the large power load 8
When it is determined that the driving condition of No. 1 is not satisfied, the switch 7 is opened to disconnect the battery 1a and the large power load 8 connected in series.

Subsequently, the controller 9 performs step s9.
At 24 and s10, the 24V release operation is performed. That is, the controller 9 stops the energization of the coil 4b to stop the contact 3c.
By opening, the series connection of the batteries 1a and 1b is released. Then, the process returns to step s1 and returns to the above-described charging operation.

In the series of operations of these steps s1 to s10, the terminal voltage [A, B] of the switch 7 changes each time the contacts 3a to 3c and the switch 7 are opened and closed. That is, in the charging operation of steps s1 and s2 described above, the batteries 1a and 1b are connected in parallel to
Since the switch 7 is opened while being charged to 2V, the terminal voltage [A, B] of the switch 7 is [12V, 0].
V].

Further, in the charge stop operation of steps s3 and 4, the battery 1b is disconnected from the parallel connection with the battery 1a and also disconnected from the ground, and the switch 7 remains open, so that the terminal of the switch 7 is opened. Voltage [A,
B] becomes [floating, 0V].

After the charge stop operation, the batteries 1a and 1b are operated in the 24V switching operation of steps s5 and s6.
Are connected in series to form a 24V power supply and the switch 7 remains open, so the terminal voltage [A, B] of the switch 7 becomes [24V, 0V].

After the 24V switching operation, step s
In the driving operation of the large power load 8 of 7 and s8, first, in step s7, the series connection of the batteries 1a and 1b is maintained to form the 24V power source and the switch 7 is closed, so that the terminal voltages [A, B ] Becomes [load voltage drop, load voltage drop] due to the switch 7, power load 8 and wiring resistance. After that, in step s8, if the switch 7 is opened while the series connection of the batteries 1a and 1b is maintained in order to stop the driving of the large power load 8,
The terminal voltage [A, B] of the switch 7 becomes [24V, 0V].

After the driving of the large power load 8 is stopped, in the 24V releasing operation of steps s9 and s10, the battery 1b is disconnected from the series connection with the battery 1a and also from the ground, and the switch 7 is disconnected. Remains open, the terminal voltage [A, B] becomes [floating, 0V].

The controller 9 can know the open / closed state of the contacts 3a to 3c and the switch 7 based on the terminal voltages [A, B] of the switch 7 which change according to the opening / closing of the contacts 3a to 3c and the switch 7. it can.

Next, a failure detecting operation of the contacts 3a to 3c and the switch 7 will be described. For example, when shifting from the 24V releasing operation to the charging operation, even if the controller 9 energizes the coil 4a in the above step s1, the terminal voltages [A, B] do not become [12V, 0V] and the previous 24V releasing is performed. When the voltage in operation [floating, 0V] remains unchanged, the contacts 3a and 3b are in the open state without being closed in step s2. When the controller 9 detects such an abnormality in the inter-terminal voltage [A, B], the contacts 3a and 3
The control operation is stopped when it is determined that b has an open failure.

Further, for example, when shifting from the charging operation to the charging stop operation, even if the controller 9 stops energizing the coil 4a in step s3, the terminal voltages [A, B] become [floating, 0V]. If the voltage [12V, 0V] during the charging operation remains unchanged, the controller 9 determines that the contacts 3a and 3b have a closed failure such as welding, and stops the control operation.

Further, the controller 9 outputs a close command signal to the switch 7 when energizing the coil 4b when shifting from the charging stop operation to the 24V switching operation and when shifting from the 24V switching operation to the high power load driving operation. When I did
When the close command signal is output to the switch 7 when the driving of the high power load is stopped,
Even when the energization of the coil 4b is stopped at the time of shifting to the V release operation, if the terminal voltage [A, B] is compared with the value at the previous stage and there is no change, the corresponding contact or switch 7 fails. Control operation is stopped.

[0025]

In the above-described conventional vehicle power source voltage switching device, when the contacts 3a and 3b, 3c or the switch 7 fails, the controller 9 only stops the control operation, and the driver does not operate. There is a problem that the driver cannot immediately know the failure because the failure is not warned. Further, when the switch 7 is welded during the driving operation of the high power load 8, the batteries 1a and 1b remain connected in series with the contact 3c always closed, so that the switch 7 is removed from the batteries 1a and 1b connected in series. Since the large power load 8 is continuously driven by continuously supplying power to the large power load 8 through the above, there is a problem that the battery is exhausted.

The present invention has been made in order to solve such a problem, and by warning the driver of the occurrence of a failure and preventing the battery from rising, the failure can be detected early and the reliability is improved. An object is to obtain a high power supply voltage switching device for a vehicle.

[0027]

A vehicle power supply voltage switching device according to the present invention is connected in series with a first switching means for switching and connecting a plurality of batteries to either parallel connection or series connection. Second switching means for connecting a plurality of batteries to a load and the plurality of batteries are connected in parallel for charging operation, and the plurality of batteries are connected in series to drive the second switching means. By connecting the plurality of batteries connected in series to the load to control the supply of predetermined electric power, and based on the voltage value that changes according to the driving of the first switching means and the second switching means. And a controller for detecting a failure of the second switching means. Provided with a warning means for failure of switching means and said second switching means is notified of the occurrence, by the controller, the first
When a failure of the switching means or the second switching means is detected, the warning means is driven, and a drive command signal for stopping the power supply to the load is output to the second switching means. When a failure is detected, the first switching means is driven to disconnect the plurality of batteries connected in series to cut off the power supply to the load.

[0028]

In the present invention, when the controller detects the failure of the first switching means or the second switching means, the controller outputs a drive command signal for stopping the power supply to the load. 2 When a failure of the second switching means is detected when output to the two switching means, the first switching means is driven to disconnect the plurality of batteries connected in series to supply power to the load. Shut off.
Further, by the warning means, the first switching means and the second switching means
Notify that a failure of the switching means has occurred.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a block diagram showing a first embodiment of the present invention. In the figure, batteries 1a and 1b, a first
The relay 2, the charger 5, the electric load 6, the switch 7, and the large power load 8 as the second switching means are the same as those in FIG. 3, and 9A is a controller provided in place of the controller 9 in FIG. Then, the engine warning light 10 provided in the driver's seat of the vehicle is connected to the controller 9A. The engine warning light 10 is turned on when the controller 9A detects a failure of the contacts 3a to 3c and the switch 7.

Next, the operation of the first embodiment having the above configuration will be described with reference to FIG. FIG. 2 is a flow chart for explaining the control operation by the controller 9A. First, the operation when the contacts 3a to 3c and the switch 7 are normal will be described.

First, the controller 9A performs step t1.
And t2, the charging operation of the batteries 1a and 1b is performed. That is, as in the conventional example, the coil 4a is energized to close the contacts 3a and 3b and the coil 4b is de-energized to open the contact 3c to connect the batteries 1a and 1b in parallel. As a result, the batteries 1a and 1b are charged to 12V by the charger 5, respectively. Also, the battery 1a
And 1b are charged and supply 12V power to the electrical load 6.

During this time, the switch 7 is open and the batteries 1a and 1b are disconnected from the large power load 8.

In this state, the terminal voltage [A, B] of the switch 7 is [12V, 0V]. This voltage value is
It is input to the controller 9A.

Then, the controller 9A turns on the battery 1
When it is determined that the conditions for driving the large power load 8 are satisfied after the charging of a and 1b is completed, steps t3 and t4
At, the charging stop operation is performed. That is, the energization of the coil 4a is stopped, the contacts 3a and 3b are opened, and the battery 1a is opened.
And the parallel connection of 1b is released. The switch 7 remains open. In this state, the terminal voltage [A, B] of the switch 7 is [floating, 0V] and is input to the controller 9A.

Subsequently, the controller 9A executes the step s.
At 5 and s6, the 24V switching operation is performed. That is,
By energizing the coil 4b and closing the contact 3c, the batteries 1a and 1b are connected in series to form a 24V power source. The switch 7 remains open. In this state, the terminal voltage [A, B] of the switch 7 is [24V,
0V], which is input to the controller 9A.

Since the switch 7 becomes operable due to the 24V power supply thus formed, the controller 9A drives the large power load 8 in steps t7 and t8. That is, the controller 9A closes the switch 7 and connects the batteries 1a and 1b connected in series to the large power load 8. As a result, the large power load 8
24V power that can be driven by a battery 1 connected in series
The high power load 8 is supplied from a and 1b. In this state, the terminal voltage [A, B] of the switch 7 is [load voltage drop amount, load voltage drop amount] due to the switch 7, the large power load 8 and the wiring resistance, and is input to the controller 9A.

After that, when the controller 9A determines that the driving condition of the large power load 8 is not satisfied, it opens the switch 7 to disconnect the series connected batteries 1a and 1b from the large power load 8. In this state, switch 7
The terminal voltage [A, B] is [24V, 0V] and is input to the controller 9A.

Subsequently, the controller 9A determines at step t.
At 9 and t10, the 24V release operation is performed. That is,
The controller 9A stops energizing the coil 4a, opens the contact 3c, and disconnects the series connection of the batteries 1a and 1b. At this time, the terminal voltage [A, B] of the switch 7 is
It is [floating, 0V] and is input to the controller 9A. Then, the process returns to step t1 to return to the above-described charging operation.

Next, the operation when the contacts 3a to 3c and the switch 7 fail will be described. For example, when shifting from the charging operation to the charging stop operation, even if the controller 9A stops energizing the coil 4a in step t3, the terminal voltages [A, B] do not become [floating, 0V] and the charging operation is performed. When the current voltage [12V, 0V] remains unchanged, the controller 9A determines that the contacts 3a and 3b have a closing failure, stops the control operation, and turns on the engine warning light 10.

Further, when the controller 9A shifts from the charge stop operation to the 24V switching operation, even if the coil 4b is energized at step t5, the terminal voltages [A, B] remain at [floating, 0V] [24V. , 0V], the controller 9A determines that the contact 3c has an open failure, stops the control operation, and turns on the engine warning light 10.

Further, when the controller 9A shifts from the 24V switching operation to the high power load driving operation, the switch 7
Even if the close command signal is output to, the terminal voltage [A, B] is [2
4V, 0V] and does not become [load voltage drop amount, load voltage drop amount], the controller 9A determines that the contact of the switch 7 has an open failure, stops the control operation, and stops the engine warning light 10 Lights up.

Even if the controller 9A outputs an open command signal to the switch 7 to stop the high power load driving operation, the terminal voltages [A, B] are equal to [load voltage drop amount, load voltage drop amount]. When the voltage does not reach [24V, 0V] until then, the controller 9A determines that the contact of the switch 7 has a closing failure. At this time, if the controller 9A stops the control, the contacts 3c are closed, so that the batteries 1a and 1b connected in series may continue to be supplied with power to the large power load 8 to cause the battery to rise.
Therefore, the controller 9 immediately stops the energization of the coil 4b and opens the contact 3c so that the large power load 8 is released.
The power supply to the engine is stopped and the engine warning light 10 is turned on.

Further, when the controller 9A shifts to the 24V releasing operation after the driving operation of the large power load is stopped, even if the energization of the coil 4b is stopped, the terminal voltages [A, B] are [24.
When it does not become [floating, 0V] while still being V, 0V, the controller 9A determines that the contact 3c has a closing failure, stops the control operation, and turns on the engine warning light 10.

Furthermore, when the contacts 9a and 3b do not close even when the coil 4a is energized because the controller 9A shifts from the 24V release operation to the charging operation, the controller 9A determines that the contacts 3a and 3b have an open failure. do it,
The control operation is stopped and the engine warning light 10 is turned on.

As described above, the first embodiment detects the failure of the contacts 3a to 3c of the relay 2 and the switch 7 based on the terminal voltage of the switch 7 and switches the contacts 3a to 3c every time the operating state is switched. When the failure is detected and the open failure of the switch 7 is detected, the control operation is stopped and the engine warning lamp 10 is turned on. Further, the contact 3c is used as a fail-safe, and when the closing failure of the switch 7 is detected, the contact 3c is opened to disconnect the series connection of the batteries 1a and 1b, thereby forcibly supplying unnecessary power to the large power load 8. At the same time as stopping, the engine warning light 10 is turned on. With this, it is possible to notify the driver of the failure occurrence, and
It is possible to prevent the battery from rising.

Example 2. In the first embodiment, the battery 1
A relay 2 which is a mechanical contact is used as a first switching means for switching a and 1b to either a series connection or a parallel connection, and a first connection means for connecting the series connected batteries 1a and 1b to a large power load 8. Although the switch 7 which is a mechanical contact is used as the 2 switching means, the same effect can be obtained by using an electronic switching element such as a transistor, an FET, or a thyristor instead of the mechanical contact.

Further, in the first embodiment described above, the case where two batteries are mounted on the vehicle has been described, but also when three or more batteries are mounted and these are switched to either serial connection or parallel connection. The same effect can be obtained.

[0048]

As described above, the present invention provides first switching means for switching and connecting a plurality of batteries to either parallel connection or series connection, a plurality of batteries and a load connected in series. And a plurality of batteries are connected in parallel for charging operation, and the plurality of batteries are connected in series to drive the second switching means to connect in series. A plurality of batteries connected to the load to control the supply of a predetermined electric power, and the first switching means based on a voltage value that changes according to the driving of the first switching means and the second switching means. A vehicle power supply voltage switching device comprising a controller for detecting a failure of the second switching means, wherein the first switching means and the first switching means are provided. A warning means is provided for notifying that a failure of the switching means has occurred, and the controller drives the warning means when a failure of the first switching means or the second switching means is detected, thereby supplying power to the load. The plurality of batteries connected in series by driving the first switching means when a failure of the second switching means is detected when the drive command signal for stopping the supply is output to the second switching means. By disconnecting the connection to disconnect the power supply to the load, the driver is warned of the occurrence of a failure and the battery is prevented from running up, so a failure can be detected early and a highly reliable vehicle power supply voltage switching device can be provided. There is an effect that can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional vehicle power supply voltage switching device.

FIG. 4 is a flowchart for explaining the operation of a conventional vehicle power supply voltage switching device.

[Explanation of symbols]

 1a battery 1b battery 2 relay 7 switch 8 high power load 9 controller 10 engine warning light

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[Procedure amendment]

[Submission date] November 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Next, the operation of the conventional example having the above-mentioned configuration will be described with reference to FIG.
Will be described. FIG. 4 is a flow chart for explaining the control operation by the controller 9. First, the controller 9 performs the charging operation of the batteries 1a and 1b in steps s1 and s2. That is, the controller 9 connects the batteries 1a and 1b in parallel by energizing the coil 4a to close the contacts 3a and 3b and deenergize the coil 4b to open the contact 3c, and the charger 5
Thus, the batteries 1a and 1b are charged to 12V, respectively. Also, the batteries 1a and 1b are charged, and
12V electric power is supplied to the electric load 6.

Claims (1)

[Claims] 1. A first switching means for switchingly connecting a plurality of batteries to either parallel connection or series connection, and second switching means for connecting a plurality of batteries connected in series to a load. And connecting the plurality of batteries in parallel for charging operation, and connecting the plurality of batteries in series to drive the second switching means to load the plurality of batteries connected in series to the load. The connection is controlled to supply a predetermined electric power, and the failure of the first switching means and the second switching means is detected based on the voltage value that changes in accordance with the driving of the first switching means and the second switching means. In the vehicle power supply voltage switching device including the controller, a failure of the first switching means and the second switching means occurs. A warning means for notifying the user that the warning means is driven by the controller when the failure of the first switching means or the second switching means is detected, and the power supply to the load is stopped. When a failure of the second switching means is detected when the drive command signal is output to the second switching means, the first switching means is driven to disconnect the plurality of batteries connected in series. A power supply voltage switching device for a vehicle, characterized in that power supply to the load is cut off.