JP2012029432A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device for preventing security properties related to theft of the vehicle from being remarkably reduced with a simple and easy method.SOLUTION: The power supply device includes: a battery for supplying electric power to a device mounted on the vehicle; a cut-off means for cutting off supply of electric power from the battery to the device; and a sensor for acquiring the vehicle information including at least the information showing an open/closed state of doors of the vehicle. Moreover, when electric power is supplied from the battery to the device, the cut-off means cuts off the supply of electric power from the battery to the device based on the vehicle information.

Description

  The present invention relates to a power supply device.

  Conventionally, various electronic devices have been mounted on vehicles, and electric power is supplied to these electronic devices (loads) from a battery (12V lead acid battery, hereinafter referred to as a 12V battery) or an alternator mounted on the vehicle. Is supplied. In a general vehicle, electric power is taken out from the battery, a starter is rotated, and an engine is started.

  Further, from the viewpoint of environmental measures, so-called hybrid vehicles that use a combination of an engine and an electric motor as a power source have recently attracted attention. The hybrid vehicle is equipped with a battery having a relatively high voltage (hereinafter referred to as a high voltage battery) in order to drive the electric motor. On the other hand, even in such a hybrid vehicle (hereinafter sometimes simply referred to as a vehicle), for example, a load driven by a 12V battery as in the conventional case so as to rotate the starter as described above. Are also used in large numbers (see, for example, Patent Document 1).

JP 2006-230102 A

  By the way, the high-voltage battery mounted in the hybrid vehicle is generally mounted as a power source for driving the electric motor. For example, a security ECU, a power management ECU, As in the past, electric power is supplied to various electronic devices of the engine ECU and various in-vehicle devices such as an air conditioner and an audio.

  Note that some of the various electronic devices require electric power not only when the hybrid vehicle is being used (for example, while traveling) but also when not being used (when parked).

  For example, a user can operate an air conditioner from a remote location via a portable terminal (mobile key) to make the room temperature in the vehicle interior an appropriate temperature, or start the engine in advance to complete the warm-up operation. The reason is that the 12V battery is charged.

  Further, as described above, the high-voltage battery in the hybrid vehicle is mounted mainly for driving the electric motor. Therefore, in the hybrid vehicle, the electric power of the high-voltage battery except for the electric motor is driven. Do not need. For this reason, when the amount of electricity stored in the 12V battery decreases, for example, the power management ECU starts up and controls the DC / DC converter so that the 12V battery is charged by the high voltage battery.

  Here, the mechanism of remote operation using a portable key will be briefly described. Generally, each mobile key stores a unique authentication code, and the mobile key transmits the authentication code. Then, for example, the security ECU determines whether or not the authentication code transmitted from the mobile key matches the authentication code registered in advance in the vehicle. If it is correct, remote operation using the mobile key is possible.

  In addition, since the remote operation as described above, which is performed by the user, generally has many scenes (such as operating an air conditioner and adjusting the room temperature in the vehicle interior) that are assumed to be used immediately from now on. The device is turned on. That is, for example, a push start system is employed that can turn on / off the vehicle, turn on / off the accessory switch, and start / stop the engine each time the push button is pressed. If it is a vehicle, it may be in the state which can drive | work a vehicle immediately. Therefore, there is a problem in that the security is lowered until the user performs a remote operation until the user actually gets on the vehicle.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power supply device capable of preventing a significant decrease in security related to vehicle theft by a simple method. .

  In order to achieve the above object, the present invention employs the following configuration. That is, this invention is a power supply device which controls the electric power supplied to the apparatus mounted in the vehicle. The power supply device includes at least a battery that supplies power to a device mounted on the vehicle, a blocking unit that blocks power supply from the battery to the device, and information indicating an open / closed state of the door of the vehicle. A sensor for acquiring vehicle information. Moreover, the said interruption | blocking means interrupts | blocks supply of electric power from the said battery to the said apparatus based on the said vehicle information, when the electric power is supplied from the said battery to the said apparatus.

  According to the present invention, it is possible to detect that the vehicle is at risk of theft, for example, by detecting the door signal, turning off the ignition switch, and determining the authentication code again. It is possible to provide a power supply device that can prevent the remarkably lowering.

The block diagram which showed an example of the structure of the power supply device which concerns on one Embodiment The flowchart which showed an example of the operation | movement which control ECU1 of the power supply device which concerns on one Embodiment performs

  Hereinafter, a power supply device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of a configuration of a power supply device according to an embodiment of the present invention. In the following description, as an example, the power supply apparatus will be described on the assumption that it is mounted on a so-called hybrid vehicle (hereinafter referred to as the host vehicle) that uses a combination of an engine and an electric motor as a power source.

  Furthermore, in the present embodiment, assuming the example in which the so-called smart entry key system that can perform locking and unlocking of the door of the host vehicle without using a mechanical key is mounted on the host vehicle. explain.

  As shown in FIG. 1, the power supply device according to the present embodiment includes a control ECU (Electronic Control Unit) 1. The control ECU 1 controls a power relay 2 and a DC / DC converter 3 which will be described later. A security device 4 is connected to the control ECU 1. In FIG. 1, configurations not directly related to the description of the embodiment according to the present invention are omitted.

  Moreover, although mentioned later for details, the said control ECU1 can acquire various signals.

  First, the control ECU 1 will be described. The control ECU 1 includes an information processing circuit such as a CPU (Central Processing Unit) (not shown), a memory for storing various data, and the like, and opens and closes the power relay 2 based on information from the security device 4 and various signals. The DC / DC converter 3 is controlled.

  The power supply relay 2 opens and closes between various loads mounted on the host vehicle and power supply means (battery or the like). The power relay 2 is not particularly limited as long as it can open and close between various loads and the power feeding means.

  The DC / DC converter 3 is a DC / DC voltage converter capable of stepping down the power supply voltage of the high voltage system 31 battery 31.

  As described above, in the present embodiment, a case where the power supply device is mounted on a so-called hybrid vehicle using a combination of an engine and an electric motor as a power source is described as an example. That is, the high-voltage system 31 battery 31 connected to the DC / DC converter 3 is provided in the host vehicle in order to supply power to a motor that is one of the drive sources of the host vehicle.

  On the other hand, the auxiliary battery 32 is a power source for driving a starter for starting an engine that is a driving source of the own vehicle together with the motor, for example, a security ECU, a power management ECU (for example, a control ECU 1). In order to supply electric power to various electronic devices such as an engine ECU and various vehicle-mounted devices such as an air conditioner and an audio.

  The auxiliary battery 32 is, for example, a 12V secondary battery. For example, the security function is activated while the host vehicle is parked, or the air conditioner is operated while the engine of the host vehicle is stopped. Or the like, the amount of power stored in the auxiliary battery 32 decreases.

  Therefore, the control ECU 1 described above detects the amount of electricity stored in the auxiliary battery 32 using a sensor (not shown), and controls the DC / DC converter 3 when the amount of electricity stored in the auxiliary battery 32 falls below a predetermined value. Then, the power supply voltage of the high voltage system 31 battery 31 is stepped down to enter the charging mode in which the auxiliary battery 32 is charged.

  Returning to the description of FIG. 1, the security device 4 includes a security ECU (Electronic Control Unit), a transmission / reception unit, a storage medium, and the like (not shown).

  The security device 4 determines whether or not to authenticate based on an authentication code corresponding to a portable key (not shown) possessed by the user of the own vehicle and an authentication code stored in the storage medium of the security device 4 To do.

  Here, for example, the user uses a portable key to operate the air conditioner from a location slightly away from the host vehicle and to set the room temperature in the passenger compartment to an appropriate temperature, or to start the engine in advance and try to warm up the vehicle. Suppose you want to

  In this case, the security device 4 determines whether or not the authentication code transmitted by the portable key matches the authentication code stored in the storage medium of the security device 4. When it is determined that the authentication has been performed correctly (that is, when the authentication code transmitted by the portable key matches the authentication code stored in the storage medium of the security device 4), for example, the security executed on the host vehicle The function is canceled and the air conditioner is activated.

  In such a scene, in general, a user often uses his / her own vehicle immediately from now on, and as described above, some devices are already turned on. That is, for example, in some cases, the host vehicle can be used immediately, so the control ECU 1 performs an operation based on various signals so that the security is not deteriorated.

  Hereinafter, the operation performed by the control ECU 1 of the power supply device according to the present embodiment will be described with reference to FIG.

  FIG. 2 is a flowchart showing an example of an operation performed by the control ECU 1 of the power supply device according to the present embodiment.

  First, in step S11 of FIG. 2, the control ECU 1 remotely operates the security device 4, that is, the user of the host vehicle operates the air conditioner or the like using the portable key, for example, with the engine of the host vehicle stopped. It is determined whether or not. If the control ECU 1 determines that a remote operation has been performed (YES), the control ECU 1 proceeds to the next step S12. On the other hand, when the determination is negative (NO), the control ECU 1 returns the process to step S11.

  Then, the security is released by the security device 4, and a certain device (for example, an air conditioner) is turned on in the host vehicle. Therefore, in step S12, the control ECU 1 enters the charging mode in which the DC / DC converter 3 is controlled to lower the power supply voltage of the high voltage system 31 battery 31 and charge the auxiliary battery 32. And control ECU1 advances a process to the following step S13.

  In step S13, the control ECU 1 determines whether or not a signal (corresponding to various signals in FIG. 1) has been detected.

  Here, the signal which control ECU1 acquires in step S13 is demonstrated. The signal acquired by the control ECU 1 is, for example, when the user of the own vehicle or a third party who is not the user of the own vehicle touches or opens the door of the own vehicle. It is a signal (referred to as a door signal) output from a sensor or the like provided. In addition, the case where the user of the own vehicle tries to open the door of the own vehicle may be a case where the user is trying to open the door using a mechanical key or a portable key, for example.

  Moreover, the case where the third party etc. who are not the users of the own vehicle are going to open the door of the own vehicle can consider the case where the door of the own vehicle is forced open. As described above, when the user performs a remote operation as described above using the portable key, some devices are already turned on. That is, for example, a push start system is employed that can turn on / off the vehicle, turn on / off the accessory switch, and start / stop the engine each time the push button is pressed. If it is a vehicle, it may be in the state which can drive | work a vehicle immediately.

  Therefore, when the door signal output from the sensor or the like of the vehicle door is detected in the next step S14, the process proceeds to the next step S14.

  In step S14, the control ECU 1 stops the system. More specifically, for example, the control ECU 1 controls the DC / DC converter 3 to step down the power supply voltage of the high-voltage system 31 battery 31 to the auxiliary battery 32. The charging that has been stopped is stopped, the power of various electronic devices such as the power management ECU and the engine ECU is turned off, and further, the ignition switch of the host vehicle is turned off.

  Thereafter, the control ECU 1 instructs the security device 4 to make an authentication code determination again (steps S15 to S16). More specifically, the security device 4 determines whether or not the authentication code transmitted by the mobile key matches the authentication code stored in the storage medium of the security device 4. If it is determined that the authentication has been correctly performed (YES in step S16 in FIG. 2), then the user can use the host vehicle.

  By doing in this way, the problem that security property falls until a user performs remote operation and the said user actually gets in a vehicle can be eliminated. That is, when the security of the host vehicle is released, for example, when a third party who is not the user of the host vehicle is trying to forcefully open the door of the host vehicle, the ignition switch is automatically turned OFF, If the authentication code is determined and the user is not the user of the own vehicle, the ignition switch or the like of the own vehicle cannot be turned on again.

  That is, for example, the security of a vehicle theft is significantly reduced by a simple method of detecting that the host vehicle is at risk of theft using, for example, a door signal, turning off the ignition switch, and determining the authentication code again. It is possible to provide a power supply device that can prevent this.

  In the above-described example, the case where the control ECU 1 detects a door signal has been described as an example, but any signal indicating that a certain operation has been performed on the host vehicle may be used. For example, when a hood in the engine room of the host vehicle is about to be opened, a signal may be output from a sensor or the like provided in the hood.

  The aspect demonstrated by the said embodiment shows a specific example only, and does not limit the technical scope of this invention at all. Therefore, any configuration can be adopted within a range where the effect of the present application is achieved.

  The power supply device according to the present invention is useful, for example, as a power supply device that is mounted on a hybrid vehicle and can prevent a significant reduction in security related to vehicle theft by a simple method.

1 ... Control ECU
2 ... Power Relay 3 ... DC / DC Converter 31 ... High Voltage Battery 32 ... Auxiliary Battery 4 ... Security Device

Claims (1)

A power supply device for controlling power supplied to a device mounted on a vehicle,
A battery for supplying power to the device mounted on the vehicle;
A blocking means for blocking the supply of power from the battery to the device;
A sensor for acquiring vehicle information including at least information indicating an open / closed state of the door of the vehicle,
The power supply device according to claim 1, wherein when the power is supplied from the battery to the device, the shut-off unit cuts off the power supply from the battery to the device based on the vehicle information.

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