JP2006347287A - Electric apparatus connection detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and surely detect a connection state of a cellular phone or the like for an on-vehicle apparatus with a simple device configuration. <P>SOLUTION: A cellular phone connection detecting device 10 is equipped with a connection terminal 11 where an external terminal 101 of the cellular phone 100 is connected to detect a connection state of the cellular phone 100 detachable with a navigation device or the like. In a connection state detecting circuit 12, a change in signal level corresponding to the connection state of the external terminal for the connection terminal 11 is detected with an output terminal 58, and it is detected whether or not the cellular phone 100 is connected with the connection terminal 11 according to the change of the signal level. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrical device connection detection device that detects a connection state of a mobile phone or the like that is detachable from an in-vehicle device.

  Conventionally, it has been pointed out that when a mobile phone (hereinafter referred to as a mobile phone) is operated while driving a car, the driving operation may be affected. Therefore, a device that realizes operations such as incoming calls and calls without directly operating a mobile phone, a so-called hands-free call device is used (see Patent Document 1 below).

  Since the hands-free call device is used by connecting a mobile phone owned by the driver, it is necessary to detect whether the mobile phone is connected to the hands-free call device, that is, whether it is connected.

As a method for detecting the connection state of the mobile phone, a detection switch for detecting whether or not the mobile phone is mounted on the mounting base (holder) of the mobile phone is provided. The presence or absence of a mobile phone, that is, the connection state is detected according to the off state. As another method, communication for confirming the connection state is performed between the hands-free call device and the mobile phone, and the connection state is detected by confirming whether or not the communication is properly performed. Has been done.
JP-A-11-027723

  In recent years, in addition to the realization of voice calls using mobile phones, for example, proposals have been made to acquire various types of information used in in-vehicle navigation devices from external information centers via mobile phones. Applications that are used by connecting to devices are expanding.

  However, for example, when detecting a connection state with a mobile phone using a detection switch as described above, it is necessary to prepare holders that are suitable for various external shapes and models of mobile phones, which increases the cost of parts. There is a problem such as.

  In addition, when detecting a connection state with a mobile phone by performing communication, it may take several seconds to several tens of seconds for this communication, so it is difficult to quickly detect the connection state There is.

  Therefore, the present invention has been made in view of the above-described conventional situation, and an electrical device connection detection device capable of detecting a connection state of an electrical device to an in-vehicle device quickly and reliably with a simple device configuration. The purpose is to provide.

  The electrical device connection detection device according to the present invention is a connection terminal to which an external terminal of an electrical device is connected in order to detect a connection state of the electrical device that is mounted on the on-vehicle device and is detachable from the on-vehicle device. The connection state detection circuit detects a change in signal level according to the connection state of the external terminal with respect to the connection terminal, and detects whether an electrical device is connected to the connection terminal according to the change in the signal level. By doing so, the above-mentioned problems are solved.

  According to the electrical device connection detection device of the present invention, the connection state can be determined only by detecting a change in the signal level according to the connection state of the external terminal of the mobile phone with respect to the connection terminal, and the connection state detection circuit is extremely simple. This can be realized by a circuit configuration, and the connection state of the electric device can be reliably detected in a short time by the connection state detection circuit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, a mobile phone connection detection apparatus 10 configured by applying the present invention will be described with reference to the drawings.

  The mobile phone connection detection device 10 is a device that detects a connection state of the mobile phone 100 that is detachable from an in-vehicle device mounted on a vehicle. In the present embodiment, the mobile phone connection detection device 10 is positioned as a rear device of the mobile phone 100 and will be described assuming that it is built in or connected to an in-vehicle device, and the illustration of the in-vehicle device is omitted. Further, the in-vehicle device is not particularly limited, and for example, a hands-free call device that realizes a call without directly operating the mobile phone 100 may be used. However, in the present embodiment, the mobile phone 100 A description will be given assuming a navigation device that acquires various types of information via the Internet.

  As shown in FIG. 1, the mobile phone connection detection device 10 has a connection terminal 11 to which the external terminal 101 of the mobile phone 100 is connected, and a signal level that changes according to the connection state of the external terminal 101 with respect to the connection terminal 11. And a connection state detection circuit 12 for detection.

  The cellular phone 100 includes a voltage output circuit 102 that outputs a predetermined voltage via the external terminal 101. The voltage output circuit 102 is formed by connecting an operational amplifier 201 and a resistor 202 to the built-in battery 200 of the mobile phone 100, and the input terminal of the operational amplifier 201 and the external terminal 101 are connected via a diode 203 that prevents backflow of the output voltage. It is connected.

  Such a voltage output circuit 102 allows a current to flow from the built-in battery 200 to the resistor 202, the diode 203, and the external terminal 101 when the mobile phone 100 is activated. When the mobile phone connection detection device 10 is connected to the external terminal 101 of the mobile phone 100, the current flowing from the mobile phone 100 to the mobile phone connection detection device 10 is a ground terminal in the mobile phone connection detection device 10. It flows toward. Thereby, the mobile phone 100 can recognize that the mobile phone connection detection device 10 is connected to the external terminal 101 from the voltage value supplied to the operational amplifier 201. On the other hand, when the mobile phone connection detection device 10 is not connected to the external terminal 101 of the mobile phone 100, no current flows from the mobile phone 100 to the mobile phone connection detection device 10. Thereby, the mobile phone 100 can recognize from the voltage value supplied to the operational amplifier 201 that the mobile phone connection detection device 10 is not connected to the external terminal 101.

  As described above, the mobile phone 100 applies a voltage to the mobile phone connection detection device 10 via the external terminal 101 to determine whether the external terminal 101 is grounded via the mobile phone connection detection device 10. Thus, a circuit for detecting whether or not the mobile phone 100 is connected to the mobile phone connection detection device 10 is provided.

  In FIG. 1, only the output voltage line output from the external terminal 101 is illustrated as a connection line between the external terminal 101 of the mobile phone 100 and the connection terminal 11 of the mobile phone connection detection device 10. As the actual connection line, a plurality of signal lines for transmitting and receiving various signals are prepared in addition to the output voltage line. Further, the physical connection form between the external terminal 101 and the connection terminal 11 is not particularly limited. For example, both may be connected using a connection cable, or both may be directly connected. Good.

  The connection state detection circuit 12 includes a microcomputer 50 to which an accessory signal output from a key switch of the vehicle and a door signal indicating the opening / closing state of the driver's seat door are input, first and second transistors 51 and 52, Four resistors 53, 54, 55, 56, a power source 57 that applies a predetermined voltage, an output terminal 58 that outputs a detection signal indicating the connection state of the mobile phone 100, and an alarm buzzer 59 connected to the microcomputer 50. And have.

  The microcomputer 50 outputs an output voltage corresponding to the input state of the accessory signal and the door signal to the base terminal of the first transistor 51. The collector terminal of the first transistor 51 is connected to the connection terminal 11 via the first resistor 53, and the emitter terminal is grounded.

  The connection terminal 11 is connected to the collector terminal of the first transistor 51 through the first resistor 53 and is connected to the base terminal of the second transistor 52 through the second resistor 54. . The third resistor 55 has one terminal connected to the middle between the second resistor 54 and the base terminal of the second transistor 52, and the other terminal grounded.

  The second transistor 52 has an emitter terminal grounded and a collector terminal connected to a power source 57 via a fourth resistor 56. A branch is provided between the emitter terminal of the second transistor 52 and the fourth resistor 56 and an output terminal 58 is drawn out.

  In the mobile phone connection detection device 10 configured as described above, even when the mobile phone 100 is connected in a state where a predetermined voltage is applied to the base terminal of the first transistor 51 by the microcomputer 50. The voltage output from the external terminal 101 of the mobile phone 100 is applied to the first transistor 51 side and is not applied to the base terminal of the second transistor 52. Therefore, the second transistor 52 is turned off. Even when the cellular phone 100 is not connected, no voltage is applied to the base terminal of the second transistor 52, so that the second transistor 52 is turned off. Therefore, regardless of whether or not the mobile phone 100 is connected, the voltage from the power source 57 is applied to the output terminal 58, and the signal level of the detection signal output from the output terminal 58 becomes high (HIGH). .

  On the other hand, when application of a predetermined voltage to the base terminal of the first transistor 51 is stopped by the microcomputer 50, the voltage applied from the external terminal 101 of the mobile phone 100 is applied to the base terminal of the second transistor 52. The second transistor 52 is turned on. As a result, the voltage from the power source 57 is applied to the emitter terminal of the second transistor 52, and the signal level of the detection signal output from the output terminal 58 becomes low (LOW).

  Here, the connection state determination processing of the mobile phone 100 by the mobile phone connection detection device 10 will be described with reference to the flowchart shown in FIG. Note that this connection state determination process is repeatedly performed every predetermined period. In the initial state, the microcomputer 50 applies a predetermined voltage to the base terminal of the first transistor 51.

  When the connection state determination process starts, in step S10, the microcomputer 50 determines whether or not the accessory signal is on. As a result of the determination, if the accessory signal is in the on state, the process proceeds to step S11. If the accessory signal is in the off state, the connection state determination process ends.

  In step S11, the microcomputer 50 determines whether or not the accessory signal has shifted from the on state to the off state. If the result of this determination is that there has been a shift, the process proceeds to step S13. If it has not been transferred, the connection state determination process is terminated.

  In step S12, the microcomputer 50 stops applying the voltage to the base terminal of the first transistor 51 and turns off the first transistor 51. Thereby, in step S13, by determining whether or not the signal level of the detection signal output from the output terminal 58 is LOW, whether the mobile phone 100 is connected (step S14) or the mobile phone 100 is It is possible to detect (determine) whether or not they are connected (step S15).

  In the above description, when the driver of the vehicle gets out of the vehicle, the mobile phone connection detection device 10 carries the mobile phone 100 for the purpose of preventing the mobile phone 100 from being left in the vehicle while being connected to the in-vehicle device. It is assumed that the connection state of the telephone 100 is detected. For this reason, when the driver pulls out the ignition key of the vehicle, when the accessory signal of the vehicle shifts from the on state to the off state, that is, in conjunction with the on / off state of the accessory signal, the connection state detection circuit 12 detects the detection signal. The circuit configuration changes the signal level. In this embodiment, the function of an accessory signal input unit to which an accessory signal is input is realized by the microcomputer 50.

  However, when the purpose is simply to detect the connection state of the mobile phone 100 to the in-vehicle device, the circuit configuration in which the microcomputer 50, the first transistor 51, and the resistor 53 are excluded from the connection state detection circuit 12. can do.

  Next, in the following, when the driver gets out of the vehicle while the mobile phone 100 is connected to the in-vehicle device using the mobile phone connection detection device 10 according to the above-described embodiment, the mobile phone 100 enters the vehicle. An embodiment for notifying the driver of misplacement will be described with reference to the flowchart of FIG. Note that this process is repeatedly performed at predetermined intervals together with the connection state determination process of FIG.

  In the present embodiment, it is assumed that a detection signal output from the output terminal 58 of the connection state detection circuit 12 is also input to the microcomputer 50. Moreover, in the connection state determination process in this embodiment, since the process from step S10 to step S12 is common with the process in embodiment mentioned above, description of the overlapping process is abbreviate | omitted in the following description, and mentioned above. Only processing different from the embodiment will be described.

  In the connection state determination process according to the present embodiment, in order to detect whether or not the mobile phone 100 is connected, the microcomputer 50 stops applying voltage to the base terminal of the first transistor 51 in step S12, and this first transistor 51 is turned off. Thereby, when the mobile phone 100 is connected, the signal level of the detection signal output from the output terminal 58 changes from the HIGH state to the LOW state.

  Next, in step S20, the microcomputer 50 determines whether or not the driver's seat door has been opened based on a door signal indicating the open / closed state of the driver's seat door of the vehicle. If the result of this determination is that it is in the open state, the process proceeds to step S21, and if it is not in the open state, the connection state determination process is terminated.

  In step S21, the microcomputer 50 determines whether or not the mobile phone 100 is connected by determining whether or not the signal level of the detection signal is in the LOW state by the connection state determination process described above. If the mobile phone 100 is connected as a result of this detection, the microcomputer 50 causes the alarm buzzer 59 to sound for a predetermined time (for example, 5 seconds) (step S22), and the connection state determination process is terminated.

  In the present embodiment configured as described above, the alarm buzzer 59 can be sounded when the driver tries to get off by opening the driver's door while the mobile phone 100 is connected. It is possible to prevent the cellular phone 100 from being left behind in the vehicle.

  In the embodiment described above, the alarm buzzer 59 is sounded for a predetermined time in consideration of the case where the driver gets off the vehicle with the mobile phone 100 intentionally connected. As a result, unnecessary power consumption due to the alarm buzzer 59 sounding can be prevented.

  Further, in the above-described embodiment, the microcomputer 50 to which the door signal is inputted realizes the function as the getting-off detection means for detecting the getting-off operation of the driver from the vehicle. Further, the alarm buzzer 59 realizes a function as a notification means for notifying the driver that the mobile phone 100 is present in the vehicle. However, the detection of the driver's getting-off operation is not limited to using a door signal, and may be detected using other various sensors. Further, the notification method for the driver is not limited to the notification by sounding the alarm buzzer 59, and may be appropriately combined with notification by voice, display of an alarm on a display device mounted on the vehicle, or the like.

  According to the mobile phone connection detection device 10 described above, the connection state of the mobile phone 100 can be reliably detected with an extremely simple circuit configuration, so that the cost can be reduced. In addition, when detecting the connection state, it is not necessary to communicate with the mobile phone 100, and since it can be realized only by hardware (electric circuit), the connection state can be detected instantaneously (about 100 msec or less). Can do.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is the schematic which shows an example of the mobile telephone connection detection apparatus shown as embodiment of this invention. It is a flowchart which shows an example of the connection state detection process by the mobile telephone connection detection apparatus shown as embodiment of this invention. It is a flowchart which shows another example of the connection state detection process by the mobile telephone connection detection apparatus shown as embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cellular phone connection detection apparatus 11 Connection terminal 12 Connection state detection circuit 50 Microcomputer 51 1st transistor 52 2nd transistor 53 1st resistor 54 2nd resistor 55 3rd resistor 56 4th resistor 57 Power supply 58 Output terminal 59 Alarm buzzer 100 Mobile phone 101 External terminal 102 Voltage output circuit 200 Built-in battery 201 Operational amplifier 202 Resistor 203 Diode

Claims (6)

In an electrical device connection detection device that detects a connection state of an electrical device that is mounted on an in-vehicle device and is detachable from the in-vehicle device,
A connection terminal to which an external terminal of the electrical device is connected;
A connection state detection circuit that detects a change in signal level according to a connection state of the external terminal with respect to the connection terminal and detects whether or not the electrical device is connected to the connection terminal according to the change in the signal level. An electrical equipment connection detection device comprising: The electrical device applies a voltage to the in-vehicle device through the external terminal, determines whether the external terminal is grounded through the in-vehicle device, and the electrical device is connected to the in-vehicle device. It has a circuit that detects whether it is connected,
The electrical device according to claim 1, wherein the connection state detection circuit detects that the electrical device is connected to the connection terminal when a voltage output from the external terminal is present. Connection detection device. Further comprising a getting-off detection means for detecting a getting-off operation of a driver from a vehicle on which the in-vehicle device is mounted,
The connection state detection circuit is in a state of detecting whether or not the electrical device is connected to the connection terminal when the getting-off operation of the driver is detected by the getting-off detection means. The electrical equipment connection detection apparatus according to claim 1 or 2.   The getting-off detecting means detects the driver's getting-off operation in response to the opening of the driver's seat door from the door signal indicating the open / closed state of the driver's seat door of the vehicle, and connects to the connection terminal. The electrical device connection detection apparatus according to claim 3, wherein the electrical device connection detection device is in a state of detecting whether or not the electrical device is connected. An accessory signal input unit for inputting a vehicle accessory signal;
The connection state detection circuit detects whether or not the electrical device is connected to the connection terminal when an accessory signal input to the accessory signal input unit is switched from an on state to an off state. The electrical equipment connection detection device according to claim 4.   When it is detected by the connection state detection circuit that the electrical device is connected to the connection terminal, and the getting-off operation of the driver is detected by the getting-off detection means, an alarm sound is generated for a predetermined time. The electric device connection detection apparatus according to claim 3, further comprising notification means for notifying the driver by emitting.

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