JP2017001566A - Electric conduction control device, electric conduction controlling method and disconnection detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric conduction control device which can reduce consumption power during stop of an engine.SOLUTION: An electric conduction control device for controlling electric conduction of a device which can operate in an automobile during stop of an engine comprises: a CPU 21 which performs control to output an oxide film destructive signal for flowing electric current required for destruction of an oxide film during only a certain period with which the oxide film can be destructed at a specified timing during operation of the engine, and further performs control to output a disconnection detection signal for flowing minute electric current having an electric current value less than that required for destruction of the oxide film during stop of the engine; and an oxide film destructive electric current output circuit 24 which outputs the oxide film destructive signal under the control of the CPU 21; and a disconnection detection signal output circuit 23 which outputs the disconnection detection signal under the control of the CPU 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an energization control device, an energization control method, and a disconnection detection device that control energization of a device operable in an automobile.

  Conventionally, various anti-theft devices for automobiles have been proposed for the purpose of protecting the automobile from dangers such as theft and vandalism. In Patent Document 1 below, as an example of such an anti-theft device, there is a function of detecting disconnection of a wire harness, and when the wire harness is disconnected, the disconnection detection device can notify the surroundings with an alarm sound. Is described. By attaching such a disconnection detection device to the inside of the automobile, it becomes possible to detect the disconnection of the wire harness due to a specific technique, and it is possible to protect the automobile from the danger of theft or vandalism.

  On the other hand, since the disconnection detection device as described above is a device that operates in an automobile in which the engine is stopped, it is necessary to reduce battery consumption as much as possible. Also in the following Patent Document 1, power consumption is reduced while the engine is stopped by intermittently monitoring disconnection of the wire harness using a strobe oscillation circuit.

Japanese Patent Application No. 2014-2826

  Since the disconnection detection device described in Patent Document 1 is a device that monitors an automobile whose engine is stopped, it needs to be energized as necessary even when the engine is stopped. At that time, the current (several mA or more) that can destroy the oxide film between the terminals of the connection part such as the connector used in the wire harness, in order to avoid contact failure due to the oxide film and to ensure the current-carrying performance. Need to flow.

  However, a current of several mA that can destroy the oxide film is quite large as a current that flows while the engine is stopped, and there is a risk of accelerating the power consumption of the battery. Such a problem may occur not only in the disconnection detection device but also in all devices that operate while the engine is stopped.

  The present invention has been made in view of the above, and an object thereof is to provide an energization control device, an energization control method, and a disconnection detection device that can reduce power consumption while the engine is stopped.

  In order to achieve the above object, an energization control device according to the present invention is an energization control device that controls energization of a device operable in an automobile while the engine is stopped, and is oxidized at a predetermined timing during engine operation. Control is performed to output the first signal, which is a signal for flowing current necessary for film destruction, for a certain period of time that can destroy the oxide film, and when the engine is stopped, the current value is less than that required for the oxide film destruction. A control unit that performs control to output a second signal that is a signal for causing a minute current to flow, a first output unit that outputs the first signal under the control of the control unit, and control of the control unit And a second output unit that outputs the second signal.

  Further, in the energization control device, the first output unit includes a first switch that switches between ON and OFF under the control of the control unit, and a first internal resistance for generating the first signal. And the second output unit outputs a first signal when the first switch is in an ON state, and the second output unit switches the second switch between ON and OFF under the control of the control unit; And a second internal resistor for generating the second signal, and the second signal may be output when the second switch is in an ON state.

  In the energization control device, the control unit may receive a signal indicating an operation state of the automobile from the outside, and determine whether the engine is operating or the engine is stopped based on the signal.

  Moreover, in the said electricity supply control apparatus, the said control part shall receive the signal on the communication line currently used in the motor vehicle, and shall perform the determination of engine operation or engine stop by the said signal.

  In the energization control device, the control unit may perform strobe control that intermittently outputs the second signal.

  In order to achieve the above object, an energization control method according to the present invention is an energization control method for controlling energization of a device operable in an automobile while the engine is stopped, wherein the oxidation control method is performed at a predetermined timing during engine operation. An oxide film destruction step for controlling the output of a first signal, which is a signal for supplying a current necessary for film destruction, for a certain period of time during which the oxide film can be destroyed, and an oxide film destruction while the engine is stopped. And a control step of performing control to output a second signal that is a signal for flowing a minute current less than a necessary current value.

  In the energization control method, the control step may be a strobe control step for performing strobe control for intermittently outputting the second signal.

  In order to achieve the above object, a disconnection detection device according to the present invention is a disconnection detection device that detects a disconnection of an internal device that is a device operable in an automobile while the engine is stopped. The first wire harness having one terminal connected to the first output unit and the second output unit that are outputs of the energization control device and the other terminal grounded via a load circuit in the internal device And a disconnection detection unit that detects disconnection of the first wire harness based on an output voltage of the energization control device in the output period of the second signal, and the control unit in the energization control device includes: When disconnection is detected by the disconnection detection unit, it is determined that the second wire harness in the internal device arranged along the first wire harness is disconnected.

  According to the present invention, it is possible to reduce power consumption while the engine is stopped.

FIG. 1 is a diagram illustrating an example of a configuration of a horn device including an energization control device according to the present embodiment. FIG. 2 is a diagram illustrating energization control according to the present embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Further, in the present embodiment, the characteristic operation related to the energization control using the horn device that is standardly mounted on the automobile will be described. Applicable to the device.

[Embodiment]
FIG. 1 is a diagram illustrating an example of a configuration of a horn device including an energization control device according to the present embodiment. In FIG. 1, a horn device 100 as an internal device is a device that can be operated in an automobile with the engine stopped. The horn device 100 includes a disconnection detection device 1 including an energization control device of the present embodiment, a battery 2 that outputs 12 V, a fuse 3 that protects an electric circuit from a large current, and a relay 4 that has a coil and a contact circuit. And a horn switch 5 corresponding to the operation of a horn button disposed on the handle, and horns (load circuits) 6 and 7. In the horn device 100, the positive terminal of the battery 2 is connected to the input side terminal of the contact circuit in the relay 4 via the fuse 3, and the output side terminal of the contact circuit is connected to the wire harness 8a, 8b, 8c. Are connected to the horns 6 and 7. The ON / OFF of the horn switch 5 controls the ON / OFF of the relay 4, that is, the ON / OFF of the contact circuit, and the horns 6, 7 output a predetermined sound such as a horn sound while the contact circuit is ON. . In the energization control of this embodiment, as will be described later, ON / OFF of the relay 4, that is, ON / OFF of the contact circuit is controlled by an operation independent of ON / OFF of the horn switch 5. Further, the horns 6 and 7 may output different horn sounds by dividing them into a high sound range and a low sound range, respectively, or may output horn sounds in the same sound range. Further, the number of horns may be three or more.

  In the horn device 100, the wire harness 8a connected to the output side terminal of the contact circuit of the relay 4 branches into two wire harnesses 8b and 8c, and the horn 6 is connected to the wire harness 8b. A horn 7 is connected to 8c. And the wire harnesses 8b and 8c are connected to GND via the internal circuits of the horns 6 and 7, respectively. Moreover, the wire harnesses 8a, 8b, and 8c are arranged so that a wire breakage detection wire harness 9 configured as a part of the wire breakage detection device 1 is along, and is connected to the horn 7 through the route shown in FIG. The disconnection detection wire harness 9 has one terminal connected to a disconnection detection signal output circuit 23 and an oxide film breaking current output circuit 24 which are outputs of an energization control circuit 11 described later, and the other terminal in the horn device 100. It is connected to GND via the internal circuit of the horn 7 and grounded. In addition, the connection of FIG. 1 is an example, and if the wire harness 9 for disconnection detection is arrange | positioned along the wire harnesses 8b and 8c, it will be connected to GND via the internal circuit of the horn 6, for example. Also good.

  In the horn device 100 configured as described above, the horns 6 and 7 and the wire harnesses 8b and 8c are generally arranged in the front of the engine room, and the horn 6 and the horn 7 are arranged in the engine room. In many cases, they are installed at different positions in front of the inside. Therefore, in the case of damage due to theft or vandalism, one of the wire harnesses 8b and 8c arranged in front is more likely to be cut than other wiring. That is, there is a high possibility that one of the wire harnesses 8b or 8c will be cut at the position of the x mark shown in FIG. For this reason, as described later, the disconnection detection device 1 detects any disconnection of the wire harness 9 for disconnection detection arranged along the wire harnesses 8b and 8c. It is determined that one of them has been cut. And the horn connected to the wire harness of the side which is not cut | disconnected is driven, and a horn sound (alarm sound) is output.

  Next, the disconnection detection device 1 in the horn device 100 will be described. The disconnection detection device 1 detects disconnection of the horn device 100 as an internal device that is an apparatus that can operate in an automobile with the engine stopped. As shown in FIG. 1, the disconnection detection device 1 includes a battery via a disconnection detection wire harness 9 as a first wire harness, an energization control circuit 11 that operates as an energization control device of the present embodiment, and a fuse 3. 2, a regulator 12 that outputs an internal power supply 5V, a disconnection detection circuit 13 as a disconnection detection unit that detects disconnection of the disconnection detection wire harness 9, and a drive circuit 14 that drives the relay 4.

The energization control circuit 11 has a function of controlling energization to the disconnection detection wire harness 9, and controls the drive circuit 14 when disconnection of the disconnection detection wire harness 9 is detected by the disconnection detection circuit 13. And a CPU 21 as a control unit that drives the relay 4 and an input I / F unit 22 that receives an ON / OFF signal indicating an operation state of the automobile and outputs the signal to the CPU 21. Further, the energization control circuit 11 has a strobe function by the switch (MOSFET) control of the CPU 21 and outputs a disconnection detection signal (I _detect ) intermittently on the disconnection detection wire harness 9 by the strobe function. An output circuit 23 is provided, and further, an oxide film break current output circuit 24 for outputting an oxide film _break signal (I _break ) on the wire harness 9 for disconnection detection by the switch (MOSFET) control of the CPU 21 is provided. It was set as the structure arrange | positioned.

  Here, as an operation for detecting disconnection in the disconnection detection device 1 configured as described above, first, energization control of the present embodiment by the energization control circuit 11 will be described. Since the disconnection detection device 1 is a device that monitors an automobile with the engine stopped, the energization control circuit 11 needs to pass a current through the disconnection detection wire harness 9 as necessary even when the engine is stopped. At that time, a current (several number) that can destroy the oxide film between the terminals of the connection part such as the connector used in the wire harness 9 for detecting the disconnection is avoided in order to avoid a contact failure due to the oxide film and to ensure the energization performance. it is necessary to continuously flow (mA or more) or about 1 A instantaneously. In this embodiment, a current of about 1 A is instantaneously supplied to the disconnection detection wire harness 9 during engine operation to destroy the oxide film, and after the engine is stopped, a minute current described later is supplied to the disconnection detection wire harness 9. By monitoring disconnection.

FIG. 2 is a diagram showing energization control of the present embodiment, that is, a procedure for generating a disconnection detection signal (I _detect ) and an oxide film break signal (I _break ) by the energization control circuit 11. Note that the ON / OFF signal is input to the energization control circuit 11 from the outside of the disconnection detection device 1, and the CPU 21 grasps the operation state of the automobile from this signal. The ON / OFF signal determines whether the external device is in the state of the car, that is, when the engine is stopped (after “door is locked with“ ignition OFF ”) or when the engine is running (“ ignition ON ”or the engine is running). Generated. For example, the CPU 21 determines that the automobile engine is stopped when the ON / OFF signal is ON (High), and the automobile engine is operating when the ON / OFF signal is OFF (Low). It is judged that.

First, when the ON / OFF signal is OFF (engine operation), the CPU 21 in the energization control circuit 11 switches as a first switch in the oxide film breaking current output circuit 24 at a predetermined timing during engine operation. 24a is controlled to be ON only for a moment (a certain period of time during which the oxide film can be destroyed). By this control, the oxide film destruction current output circuit 24 is placed on the wire harness 9 for detecting disconnection when the switch 24a is in the ON state. An oxide film break signal (I _break ) is output as a first signal. In other words, the oxide film breaking current output circuit 24 generates an oxide film breaking signal (I _break ), which is a signal for supplying a current necessary for breaking the oxide film, at a predetermined timing during engine operation. It functions as a first output unit that outputs the oxide film breakdown signal (I _break ) under the control of the CPU 21 that outputs only for a certain period of time. Since the internal resistance 24b as the first internal resistance of the horn 7 connected to the wire harness 9 for detecting disconnection is low resistance, the oxide film break signal (I _break ) is _generated in the oxide film break current output circuit 24. The current value is determined by the resistance value. In this embodiment, the resistance in the oxide film _break current output circuit 24 is set to a value such that the oxide film break signal (I _break ) is about 1A. In FIG. 2, the oxide film breaking signal (I _break ) is output only once during the period when the ON / OFF signal is OFF. However, the present invention is not limited to this and may be output at a constant cycle. Thereby, the oxide film between the terminals in the wire harness 9 for disconnection detection can be destroyed.

Thereafter, when the ON / OFF signal changes to ON (when the engine is stopped), the CPU 21 intermittently switches the switch 23a as the second switch in the disconnection detection signal output circuit 23 during the period when the ON / OFF signal is ON. In this control, the disconnection detection signal output circuit 23 causes the disconnection detection signal (second signal) on the wire harness 9 for disconnection detection when the switch 23a is in the ON state. I _detect ) is output intermittently. That is, the disconnection detection signal output circuit 23 performs strobe control of the CPU 21 that intermittently outputs a second signal that is a signal for allowing a minute current less than the current value necessary for the destruction of the oxide film to flow while the engine is stopped. It functions as a second output unit that outputs the disconnection detection signal (I _detect ). In addition, since the oxide film between the terminals in the disconnection detection wire harness 9 has already been destroyed in the period when the ON / OFF signal is OFF, the disconnection detection signal (I _detect ) is, for example, 1 mA (for destroying the oxide film). Energization performance can be sufficiently ensured even with a minute current less than the minimum current value required for the above. Therefore, in the present embodiment, a minute current of less than 1 mA is used as the element that limits the current output on the wire harness 9 for disconnection detection, using the internal resistance 23b as the second internal resistance in the disconnection detection signal output circuit 23. The resistance is large enough to allow flow. Thereby, the power consumption when the engine is stopped can be significantly reduced as compared with the prior art.

In the state where the energization control as shown in FIG. 2 is performed, the disconnection detection circuit 13 monitors the disconnection of the disconnection detection wire harness 9 while the engine is stopped. That is, the disconnection detection circuit 13 detects disconnection of the disconnection detection wire harness 9 based on the output voltage of the energization control circuit 11 during the output period of the disconnection detection signal (I _detect ). Disconnection detection circuit 13 monitors the voltage value V _in of the disconnection detection wiring harness 9 (see FIG. 1), it is compared with a preset reference voltage V _ref and the voltage value V _in, the circuit having the functions of the comparator It is. In the present embodiment, the disconnection detection circuit 13 determines that the disconnection detection wire harness 9 is normal when, for example, the voltage value Vin _in the output period of the disconnection detection signal (I _detect ) is lower than the reference voltage V _ref. When the voltage value Vin _in the output period of the disconnection detection signal (I _detect ) is higher than the reference voltage _Vref, it is determined that the disconnection detection wire harness 9 is disconnected. The reference voltage V _ref is the voltage value V _in (= V _in1 ) applied to the internal resistance of the horn 7 when the disconnection detection wire harness 9 is normal, and the disconnection detection wire harness 9 is disconnected. A voltage value between the voltage value V _in = 12 V (= V _in2 ), that is, a voltage value satisfying “V _in1 <V _ref <V _in2 ”.

For example, when the wire harness 8b or 8c as the second wire harness is cut due to theft or vandalism while the engine is stopped, the wire harness for detecting disconnection arranged along the wire harnesses 8b and 8c. 9 is disconnected together, the disconnection detection circuit 13 detects the voltage value _Vin2 with respect to the voltage value Vin _in the output period of the disconnection detection signal (I _detect ), and then the disconnection detection wire harness 9 is detected. Is notified to the CPU 21 in the energization control circuit 11.

  And CPU21 which received the notification that the wire harness 9 for disconnection detection has a disconnection judges that either one of the wire harnesses 8b and 8c arrange | positioned along the wire harness 9 for disconnection detection was cut | disconnected. Then, the drive circuit 14 is controlled to drive the relay 4. Thereby, regardless of the ON / OFF state of the horn switch 5, the contact circuit of the relay 4 is turned ON, and the horn connected to one of the wire harnesses that is not cut outputs a horn sound.

Note that the period S1 when the ON / OFF signal in FIG. 2 is OFF (when the engine is operating) is a predetermined timing during the engine operation in the energization control method for controlling the energization of the device operable in the automobile while the engine is stopped. This corresponds to a period including an oxide film destruction step in which the oxide film destruction signal (I _break ), which is a signal for supplying a current necessary for breaking the oxide film, is output for a certain period of time during which the oxide film can be broken. . Further, in the period S2 in which the ON / OFF signal in FIG. 2 is ON (when the engine is stopped), a disconnection detection signal (a signal for causing a minute current less than a current value necessary for breaking the oxide film to flow while the engine is stopped) ( This corresponds to a period including a strobe control step (control step) for performing strobe control for intermittently outputting I _detect ).

  In the present embodiment, as an example, an ON / OFF signal generated by an external device judging the state of the vehicle is input to the disconnection detection device 1. However, the present invention is not limited to this. It is good also as inputting the signal on the used communication line into the disconnection detection apparatus 1. FIG. In this case, the CPU 21 determines the state of the automobile, that is, whether the engine is stopped or the engine is operating, by checking the content of the signal on the communication line.

As described above, in the present embodiment, the CPU 21 generates an oxide film break signal (I _break ), which is a signal for allowing a current necessary for breaking the oxide film to flow at a predetermined timing during engine operation. Is output only for a certain period of time that can be broken, and the disconnection detection signal (I _detect ), which is a signal for passing a minute current less than the current value necessary for breaking the oxide film, is intermittently stopped while the engine is stopped. The strobe is controlled to output to Thereby, the power consumption when the engine is stopped can be reduced.

  In the above description, the embodiment for the purpose of reducing the power consumption while the engine is stopped has been described. Power consumption period applied to the internal device of the automobile can be reduced even during engine operation, by taking a sufficiently long energization cycle and intermittently passing a small current (less than 1 mA) during that period.

The second signal (disconnection detection signal (I _detect )) is a strobe control that intermittently outputs a signal. However, if power consumption of the battery is allowed, the second signal is a continuous output. Also good.

  The energization control device, the energization control method, and the disconnection detection device according to the above-described embodiment of the present invention are not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. .

1 Disconnection detector 2 Battery 3 Fuse 4 Relay 5 Horn switch 6, 7 Horn (load circuit)
8b, 8c Wire harness (second wire harness)
9 Wire harness for disconnection detection (first wire harness)
11 Energization control circuit (energization control device)
12 Regulator 13 Disconnection detection circuit (disconnection detection unit)
14 Drive circuit 21 CPU (control unit)
22 input I / F unit 23 disconnection detection signal output circuit (second output unit)
23a switch (second switch)
23b Internal resistance (second internal resistance)
24 Oxide film breakdown current output circuit (first output section)
24a switch (first switch)
24b Internal resistance (first internal resistance)
100 Horn device (internal device)

Claims (8)

An energization control device for controlling energization of a device operable in an automobile with the engine stopped,
At a predetermined timing during engine operation, control is performed to output a first signal, which is a signal for flowing a current necessary for destruction of the oxide film, for a certain period of time during which the oxide film can be destroyed. A control unit that performs control to output a second signal that is a signal for causing a minute current less than a current value necessary for destruction of the oxide film to flow;
A first output unit that outputs the first signal under the control of the control unit;
A second output unit that outputs the second signal under the control of the control unit;
An energization control device comprising: The first output unit includes a first switch that switches between ON and OFF under the control of the control unit, and a first internal resistor for generating the first signal, wherein the first switch Outputting the first signal in the ON state;
The second output unit includes a second switch that switches between ON and OFF under the control of the control unit, and a second internal resistance for generating the second signal, and the second switch Outputting the second signal in the ON state;
The energization control apparatus according to claim 1. The control unit receives a signal indicating the operation state of the vehicle from the outside, and determines whether the engine is operating or the engine is stopped based on the signal.
The energization control device according to claim 1. The control unit receives a signal on a communication line used in an automobile, and determines whether the engine is operating or the engine is stopped based on the signal.
The energization control device according to claim 1. The control unit performs strobe control for intermittently outputting the second signal.
The energization control apparatus according to any one of claims 1 to 4. An energization control method for controlling energization of a device operable in an automobile with an engine stopped,
An oxide film destruction step for performing control to output a first signal, which is a signal for causing a current necessary for destruction of the oxide film to flow at a predetermined timing during engine operation, for a certain period of time capable of destroying the oxide film;
A control step for performing control to output a second signal that is a signal for causing a minute current less than a current value necessary for destruction of the oxide film to flow while the engine is stopped;
An energization control method comprising: The control step is a strobe control step for performing strobe control for intermittently outputting the second signal.
The energization control method according to claim 6. A disconnection detection device that detects a disconnection of an internal device that is operable in an automobile with the engine stopped,
The energization control device according to any one of claims 1 to 5,
A first wire harness having one terminal connected to a first output unit and a second output unit, which are outputs of the energization control device, and the other terminal grounded via a load circuit in the internal device; ,
A disconnection detector that detects disconnection of the first wire harness based on an output voltage of the energization control device in an output period of the second signal;
With
The control unit in the energization control device is obtained by cutting the second wire harness in the internal device arranged along the first wire harness when the disconnection detection unit detects the disconnection. To judge,
A disconnection detecting device characterized by that.

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