JP4693291B2 - Battery rise prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery rise prevention device for preventing battery rise of a battery mounted on a vehicle.
[0002]
[Prior art]
In general, a vehicle such as a passenger car or a truck may elapse for a long period of time after the vehicle is manufactured until it is actually delivered to a user. In addition, the battery mounted on the vehicle has a small but dark current flowing, and when charging is not performed for a long time, the charged voltage is discharged, and when the battery is delivered to the user, There may be a problem that the battery voltage is lowered and the ignition cannot be started.
[0003]
In order to solve such a problem, a fuse is installed between each electronic control device mounted on the vehicle and the battery, and the fuse is removed until the vehicle is delivered to the user. A method for preventing the occurrence is used. However, this method is troublesome in attaching the fuse, and the same problem as described above occurs when the vehicle is not used for a long time (for example, 30 days or more).
[0004]
Therefore, conventionally, as described in JP 2000-142275 A (hereinafter referred to as the conventional example), a keep relay is installed between the battery and the electronic control device, and the keep relay is cut off. A technique for preventing the occurrence of dark current has been proposed.
[0005]
FIG. 4 is a circuit configuration diagram schematically showing the battery rising prevention device 101 described in the conventional example. As shown in the figure, an overcurrent protection fuse F101 is installed between the battery E101 and various electronic control devices 102a to 102d mounted on the vehicle, and further, a contact 103a of the keep relay 103 is provided. Is provided.
[0006]
Further, a drive circuit 104 for driving the relay coil 103 c of the keep relay 103, a CPU 105, and a regulator 106 are provided. The regulator 106 converts, for example, a battery voltage of 12 volts into 5 volts and supplies it to the CPU 105.
[0007]
In the above configuration, the CPU 105 measures the time when the ignition switch 107 of the vehicle is not turned on. For example, when the ignition switch is not turned on for 30 days, the CPU 105 sends a drive signal to the drive circuit 104 to turn off the keep relay 103. And the keep relay 103 is turned off by operating the drive circuit 104. As a result, dark current flowing from the battery E101 to the electronic control units 102a to 102d is prevented, and the battery is prevented from running out.
[0008]
[Problems to be solved by the invention]
However, in the conventional battery prevention device 101 described above, the use of the keep relay 103 can prevent dark current, but the relay contact 103a is interrupted due to malfunction of the relay contact 103a of the keep relay 103. In such a case, the drive voltage cannot be supplied to the electronic control units 102a to 102d. That is, when the vehicle travels, the keep relay 103 is often subjected to intense vibration and impact, and when the relay contact 103a is disconnected due to these external factors, the electronic control devices 102a to 102d are driven. The problem of not being able to occur.
[0009]
The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to immediately recover even if the relay contact of the keep relay is disconnected during vehicle travel. It is an object of the present invention to provide a battery rise prevention device that can be used.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 of the present application is arranged between an electronic control device mounted on a vehicle and a battery that outputs a drive voltage to the electronic control device, and the electronic control device In a battery rise prevention device that prevents battery run-off by appropriately disconnecting the connection with the battery, a keep relay that is installed on a wiring that connects the battery and the electronic control device, and the keep relay is turned on. Alternatively, a control means for outputting a switching signal to turn off, a relay driving means for switching on / off of the keep relay, and a shut-off of the keep relay are detected by the switching signal output from the control means. comprising a shut-off detecting means, and said control means, either the ignition switch of the vehicle is turned on, or off operation of the When one of the operations, and the when the interruption of the keep relay at the cutoff detecting means is detected while the ignition switch is ON, the relay drive unit switching signal in order to turn on the keep relay It is characteristic to output to.
[0014]
According to a second aspect of the present invention, when the ignition switch is turned on, the control means sends a switching signal to the relay drive so as to turn on the keep relay after a predetermined time elapses after the on operation. Output to the means.
[0015]
According to a third aspect of the present invention, the control means sends a switching signal to the relay driving means to turn on the keep relay when the control means is reset or when the control means is initialized. It is characterized by outputting.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a battery run-out prevention device according to the first embodiment of the present invention. As shown in the figure, the battery rise prevention device 1 is disposed between a battery E1 and electronic control devices (such as an electric seat control device and an air conditioner control device) 2a to 2d mounted on the vehicle. It has a keep relay 3 for switching on and off the voltage supply to each of the electronic control devices 2a to 2d.
[0017]
Further, a drive circuit (relay drive means) 4 that outputs an operating voltage to the relay coil 3c of the keep relay 3, a CPU 5 (control means) that outputs a drive signal (switching signal) to the drive circuit 4, and a battery E1 And a regulator 6 that outputs a voltage (for example, 5 volts) supplied to the CPU 5 by stepping down an output voltage (for example, 12 volts).
[0018]
The CPU 5 outputs a drive signal to the drive circuit 4 to turn on the keep relay 3 when the ignition switch 7 is turned on and off. In addition, the code | symbol F1 shown to the same figure is a fuse for overcurrent protection. Reference numeral W <b> 1 is a power wiring connected to the ignition switch 7.
[0019]
Next, the operation of the battery running prevention device 1 according to the present embodiment configured as described above will be described. During normal operation, the on / off state of the ignition switch 7 is monitored under the control of the CPU 5, and the keep relay 3 is switched on / off accordingly. That is, when the ignition switch 7 is not turned on continuously for a long period (for example, 30 days), a drive signal is output to the drive circuit 4 to turn off the keep relay 3, and the drive circuit 4 An operating voltage is applied to 3c to turn off the relay contact 3a.
[0020]
Thereby, since the electrical connection between the battery E1 and each electronic controller 2a-2d is interrupted | blocked, generation | occurrence | production of a dark current can be suppressed and a battery run-up can be prevented.
[0021]
When the ignition switch 7 is operated while the keep relay 3 is turned off, an ignition on signal is supplied to the CPU 5, and the relay contact 3a of the keep relay 3 is turned on under the control of the CPU 5. And Thereby, the voltage output from the battery E1 is supplied to each of the electronic control devices 2a to 2d and becomes operable.
[0022]
Here, the relay contact 3a of the keep relay 3 may be interrupted due to an impact or vibration during traveling of the vehicle. In the present embodiment, under the control of the CPU 5, when the ignition switch 7 is turned on and off, a drive signal is output to the drive circuit 4 to turn on the keep relay 3 each time. Even if the relay contact 3a of the keep relay 3 is cut off due to an external factor, the keep relay 3 is surely turned on at the next turn-on operation of the ignition switch 7 or the next turn-off operation of the ignition switch 7. It is controlled to become.
[0023]
Thus, in the battery rising prevention device 1 according to the present embodiment, even when the keep relay 3 for preventing dark current is turned off due to an external factor such as an impact or vibration, the keep relay 3 is thereafter turned off. Can be turned on, so that the drive voltage can be reliably applied to each of the electronic control units 2a to 2d. Thereby, the reliability of the apparatus can be improved.
[0024]
In the above-described embodiment, the drive signal is output so as to turn on the keep relay 3 when the ignition switch 7 is turned on and off. However, while the ignition switch 7 is turned on. In addition, the drive signal may be output at an arbitrary time interval (for example, one minute interval). Furthermore, a configuration in which a drive signal is continuously output while the ignition switch 7 is on can be employed. Even in such a configuration, it is possible to achieve the same effect as in the above embodiment.
[0025]
Further, even when the CPU 5 is reset and when the CPU 5 performs initial setting, if the drive signal is output so as to turn on the keep relay 3, the reliability of the apparatus can be further improved. it can.
[0026]
Next, a second embodiment of the present invention will be described. FIG. 2 is a circuit diagram illustrating a configuration of the battery running prevention device 11 according to the second embodiment. As shown in the figure, the battery rise prevention device 11 is provided with an interruption detection circuit (interruption detection means) 8 between the CPU 5 and the wiring connecting the keep relay 3 and each of the electronic control devices 2a to 2d. This is different from the first embodiment described above.
[0027]
The interruption detection circuit 8 detects that the keep relay 3 has been interrupted, and outputs this detection signal to the CPU 5. Other configurations are the same as those shown in FIG. 1, and thus the same reference numerals are given and description of the configurations is omitted.
[0028]
Hereinafter, the operation of the battery running prevention device 11 according to the second embodiment will be described. In the present embodiment, as in the first embodiment described above, during the normal operation, the on / off operation of the keep relay 3 is controlled by the control of the CPU 5, and the dark current flowing through the electronic control devices 2a to 2d is cut off. Prevents battery from running out.
[0029]
Now, when the relay contact 3a of the keep relay 3 is interrupted due to external factors such as vibration and shock during the traveling of the vehicle, this is detected by the interrupt detection circuit 8, and this detection signal is output to the CPU 5. Is done.
[0030]
When this detection signal is given, the CPU 5 outputs a drive signal to the drive circuit 4 to turn on the keep relay 3. Thereby, the keep relay 3 in the blocked state is immediately turned on, so that the supply of the battery voltage to each of the electronic control devices 2a to 2d can be continued.
[0031]
Further, as described in the first embodiment, the CPU 5 outputs a drive signal to turn on the keep relay 3 even when the ignition switch 7 is turned on and off.
[0032]
In this way, the battery run-out prevention device 11 according to the present embodiment detects that the keep relay 3 is actually shut off by the shut-off detection circuit 8 as well as when the ignition switch 7 is turned on / off. In this case, since the operation is performed immediately so that the keep relay 3 is turned on, the reliability can be further improved.
[0033]
Next, a third embodiment of the present invention will be described. FIG. 3 is a circuit diagram showing a configuration of the battery run-out prevention device 21 according to the third embodiment. As shown in the figure, the battery run-off prevention device 21 is different from the first embodiment described above in that the CPU 5 includes a timer circuit 5a.
[0034]
The timer circuit 5a measures the elapsed time after the ignition switch 7 is turned on, and the CPU 4 is driven after a predetermined time counted by the timer circuit 5a has elapsed after the ignition switch 7 is turned on. A drive signal is output to the circuit 4 to turn on the keep relay 3.
[0035]
3 is a power wiring connected to the ignition switch 7.
[0036]
Next, the operation of the battery run-out prevention device 21 according to the third embodiment configured as described above will be described.
[0037]
In the present embodiment, as in the first embodiment described above, during the normal operation, the on / off operation of the keep relay 3 is controlled by the control of the CPU 5, and the dark current flowing through the electronic control devices 2a to 2d is cut off. Prevents battery from running out.
[0038]
When the ignition switch 7 is turned on and off, a drive signal is output to the drive circuit 4 to turn on the keep relay 3 each time under the control of the CPU 5. Even when the relay contact 3a of the keep relay 3 is cut off, the operation is performed to restore this.
[0039]
Here, in the present embodiment, after the ignition switch 7 is turned on, a drive signal for turning on the keep relay 3 is output after a predetermined time counted by the timer circuit 5a has elapsed. That is, when the relay contact 3a of the keep relay 3 is interrupted due to some external factor, and then the ignition switch 7 is turned on, the keep relay 3 is turned on after a predetermined time delay.
[0040]
Accordingly, since the keep relay 3 is turned on after a predetermined time delay from the timing of the occurrence of the inrush current flowing in the power wiring W1 in conjunction with the turning on of the ignition switch 7, the inrush current flowing through the entire apparatus can be suppressed. .
[0041]
As described above, in the battery rising prevention device 21 according to the third embodiment of the present invention, as in the first embodiment described above, the keep relay 3 for preventing the dark current is externally applied such as an impact or vibration. Even when the ignition switch 7 is turned off due to various factors, it is possible to restore the keep relay 3 to the on state when the ignition switch 7 is operated (on operation or off operation) next time. A driving voltage can be applied to 2d.
[0042]
Further, since the keep relay 3 is turned on slightly later than the timing at which the ignition switch 7 is turned on, the inrush current when the ignition switch 7 is turned on can be suppressed.
[0043]
In each of the above-described embodiments, the example in which the four electronic control devices 2a to 2d are provided has been described. However, the present invention is not limited to this, and one to three or five or more are provided. It is also possible to use an electronic control unit.
[0044]
【The invention's effect】
As described above, in the battery rising prevention device according to the present invention, even when the relay contact of the keep relay that is in the on state is turned off due to an external factor, the next ignition is turned on, or When the turn-off operation is performed, a switching signal is output from the control means to turn on the keep relay, so that the keep relay that has been turned off can be restored to the on state.
[0045]
In addition, when a shut-off detection means is installed and a switching signal is output to turn on the keep relay when the shut-off detection means detects the keep relay shut-off, immediately after the keep relay shut-off, Since this can be turned on, the reliability can be further improved.
[0046]
Further, when the ignition switch is turned on, the reliability can be improved as described above by outputting a switching signal to turn on the keep relay at all times or at an arbitrary time interval.
[0047]
In addition, the occurrence of inrush current can be suppressed by turning on the keep relay after a predetermined time delay from the timing of turning on the ignition switch.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a configuration of a battery run-out prevention device according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing a configuration of a battery run-out prevention device according to a second embodiment of the present invention.
FIG. 3 is a circuit diagram showing a configuration of a battery run-out prevention device according to a third embodiment of the present invention.
FIG. 4 is a circuit diagram showing a configuration of a conventional battery run-out prevention device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11,21 Battery rising prevention apparatus 2a-2d Electronic controller 3 Keep relay 3a Relay contact 3c Relay coil 4 Drive circuit (relay drive means)
5 CPU (control means)
5a Timer circuit 6 Regulator 7 Ignition switch 8 Interruption detection circuit (interruption detection means)
E1 battery F1 fuse

Claims (3)

A battery that is disposed between an electronic control device mounted on a vehicle and a battery that outputs a drive voltage to the electronic control device, and prevents the battery from rising by appropriately disconnecting the connection between the electronic control device and the battery. In the rise prevention device,
A keep relay installed on a wiring connecting the battery and the electronic control unit;
Control means for outputting a switching signal to turn on or off the keep relay;
Relay drive means for switching on and off the keep relay according to a switching signal output from the control means;
An interruption detection means for detecting that the keep relay is interrupted , and
The control means, the ignition switch is turned on in the vehicle, or when either one of the operation of the off operation, and, blocking of the keep relay at the blocking detection means is detected while the ignition switch is turned on when the battery up prevention device and outputs a switching signal in order to turn on the keep relay to the relay driving means. The control means, when the ignition switch is turned on , outputs a switching signal to the relay driving means to turn on the keep relay after a predetermined time has elapsed after the on operation. The battery rising prevention device according to claim 1. The control means outputs a switching signal to the relay driving means to turn on the keep relay when the control means is reset or when the control means is initialized. The battery rising prevention apparatus in any one of Claim 1 or Claim 2 .

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