JP6828917B2 - Power control unit - Google Patents

Description

The present invention relates to a power control device such as a car accessory added to the inside of a car after factory shipment by a user, such as a retrofit car accessory of a car, and particularly when the car is in a running state or a running ready state. The present invention relates to a power supply control device that supplies power to a car accessory or the like only at a certain time.

Generally, around the driver's seat or the rear seat of a car, a power connection socket (cigar socket or accessory socket:) for supplying power from the battery of the car to a retrofit car accessory such as a map lamp used in the car. Hereinafter referred to as an accessory socket) is provided. Depending on the manufacturer and type of automobile, the accessory socket can turn on the power supply at the ACC (accessory) position of the car key (ignition switch), and the power supply can be kept on regardless of the position of the ignition switch. There is something to be done.

For example, if a car accessory or the like that continuously uses electric power is installed in a car having an accessory socket that keeps the power supply ON (power is supplied from the accessory socket), the battery may run out due to long-term parking. .. In order to prevent the battery from running out due to such a car accessory, a power control device that does not supply power to the car accessory or the like from the accessory socket when the power generation device (alternate) linked with the engine is not operating is known. (See, for example, Patent Document 1). In Patent Document 1, the fact that the power generation device (or engine) is in an operating state is detected by the alternator noise of the power generation device superimposed on the output voltage of the battery.

In recent years, hybrid cars (HVs) equipped with both a driving motor and an engine have been released by multiple manufacturers, and some of them can run a predetermined distance only with a battery without starting the engine. is there. In addition, automobiles with an idling stop function that temporarily stop the engine when waiting for a traffic light at an intersection and quickly start the engine when the traffic light turns blue and the accelerator is depressed are also on sale.

Japanese Unexamined Patent Publication No. 11-22284

The number of accessory sockets installed in a standard general automobile is basically one, and the number of accessory sockets is two to three even in a luxury car or a large car having a large passenger capacity. On the other hand, car accessories basically require one accessory socket for one car accessory, and when the occupant wants to use multiple car accessories at the same time, the number of accessory sockets is insufficient. There is.

Further, in the case of a vehicle that can run only with a battery or a car with an idling stop function, the power generation device does not operate during battery running or idling stop, so that alternator noise does not occur. In such an automobile, if the power supply of the car accessory is controlled by the power supply control device of Patent Document 1, the car accessory or the like cannot be used while the battery is running or the engine is stopped by the idling stop function.

Therefore, in order to solve the above problems, the present invention can supply electric power from other than the accessory socket, and can supply electric power to a wide variety of automobile car accessories and the like even while the battery is running or idling stop. It is an object of the present invention to provide a control device.

(1) In order to solve the above problems, in the power supply control device, a communication means for communicating with a computer on the vehicle side via an in-vehicle communication network, a noise detecting means for detecting noise from a power supply voltage, and predetermined electrons from the power supply. A switch that turns on / off the power supply voltage supplied to the circuit, a signal from the vehicle-side computer received by the communication means, and a control means that controls the on / off of the switch by using the noise detected by the noise detecting means. Be prepared.

In the power supply control device, since the signal output from the vehicle side computer to the in-vehicle communication network is used for ON / OFF control of the power supply voltage supplied to the predetermined electronic circuit, erroneous judgment can be suppressed as compared with the case where only noise is used. When noise cannot be detected, power can be supplied to a predetermined electronic circuit using a signal received from the vehicle-side computer.
The predetermined electronic circuit may be, for example, an electronic circuit provided inside a car accessory or the like. Further, it is particularly preferable that the power supply control device is built in the connector of the power supply, for example.
Alternatively, a predetermined electronic circuit and the main power supply control device may be incorporated in a car accessory or the like.

(2) Preferably, the noise detecting means of the power supply control device is set to detect the noise generated when the vehicle is started.

As the noise generated when the vehicle is started, for example, in the case of an automobile equipped with an engine, it is preferable to use the noise generated when the vehicle is started due to the voltage drop caused by the engine starter, instead of the alternator noise of the power generation device as in the past. .. Alternator noise is noise that remains even after rectification due to the operation of the AC power generator, so while the noise level is relatively low at relatively high frequencies, the noise generated when the vehicle starts is different from other electrical components. Noise detection errors are reduced because the noise is at a relatively large level over a relatively long period of time due to a starter that uses a large amount of power that causes a voltage drop even if all are stopped. Further, as the noise generated when the vehicle is started, for example, in the case of an automobile such as an electric vehicle or a hybrid vehicle, noise generated when power supply to each part of the vehicle is started can be mentioned. For example, in the case of a vehicle such as an electric vehicle or a hybrid vehicle in which power supply is started when communication with a transmitter owned by the driver is established, did the noise of the same pattern as the noise generated at this time occur? Should be determined. As this noise, it is preferable to detect noise due to a voltage drop. By using the noise generated at the time of starting the vehicle with few detection errors and the signal received from the computer on the vehicle side, it is possible to reliably supply the power supply to a predetermined electronic circuit after starting the vehicle.

(3) Preferably, the control means of the power supply control device does not turn off the switch when the signal from the computer on the vehicle side can be received even when the noise generated at the time of starting the vehicle is not detected by the noise detecting means. It is good to set it to.

By doing so, the power control device can supply power to a predetermined electronic circuit even while the battery is running or idling is stopped. This is because in a hybrid car (HV) or a car having an idling stop function, the computer on the vehicle side wakes up and outputs speed information, running-related information, etc. even while the vehicle is running on a battery or idling stop. ..

(4) Preferably, in the power supply control device, the noise generated at the time of starting the vehicle may be the noise including the voltage drop generated at the time of starting the engine of the vehicle having the engine.
By doing so, the noise detecting means can accurately detect the start of the vehicle having the engine.

(5) Preferably, in the noise detecting means of the power supply control device, the noise generated at the time of starting the vehicle may be the noise including the voltage drop generated when the power supply to the vehicle of the electric vehicle is turned on. ..
By doing so, the noise detecting means can accurately detect the start of the vehicle of the electric vehicle.

(6) Preferably, the control means of the power supply control device turns on the switch when the noise detection means detects the noise generated at the time of starting the vehicle after the communication means can receive the signal from the vehicle side computer. It is good to do it.

By doing so, in the power supply control device, when noise is detected after the communication means receives the signal from the vehicle side computer, the switch is turned on, so that erroneous determination can be reliably prevented. For example, a vehicle-side computer of a vehicle having a security function such as an immobilizer transmits a signal for canceling the security function before the vehicle starts when vehicle noise occurs. Therefore, the noise is detected after receiving this signal. In such a case, by turning on the switch, it is possible to reliably prevent erroneous determination of the vehicle having the security function. After the signal from the vehicle-side computer can be received, it is preferable that the signal from the vehicle-side computer cannot be received to the state where the signal from the vehicle-side computer can be received. As the signal received from the computer on the vehicle side, it is particularly preferable that the signal is not output when the vehicle is in a state where it cannot start traveling.

(7) Preferably, the communication means of the power supply control device uses both an in-vehicle communication network that outputs a spontaneous output signal from the vehicle-side computer and an in-vehicle communication network that outputs a response output signal from the vehicle-side computer. Good.

By doing so, in the power supply control device, the network used is one for both the vehicle type of the in-vehicle communication network using the spontaneous output signal and the vehicle type of the in-vehicle communication network using the response output signal. The supply of power to a predetermined electronic circuit can be accurately controlled only by the power control device. The spontaneous output signal is a signal actively output from the vehicle-side computer, and the response output signal is a signal passively output from the vehicle-side computer only when a response request is received.

(8) Preferably, the communication means of the power supply control device has a configuration capable of connecting to and communicating with a plurality of different in-vehicle communication networks, and the control means monitors a plurality of different in-vehicle communication networks connected to the communication means. Then, it is preferable to determine ON / OFF of the switch by using the information from the in-vehicle communication network that the communication means of the plurality of different in-vehicle communication networks can communicate with.

By doing so, since the power supply control device uses the in-vehicle communication network capable of communicating among a plurality of different in-vehicle communication networks, it is determined by only one power supply control device for a vehicle model having a wide variety of in-vehicle communication networks. It can supply power to the electronic circuit of.

(9) It is preferable that the control means of the power supply control device turns on the switch when the signal from the vehicle-side computer is received, and turns off the switch when the signal from the vehicle-side computer cannot be received.

By doing so, the control means of the power supply control device turns on the power supply voltage supplied to the predetermined electronic circuit when the signal from the vehicle side computer is received, not when the noise is detected from the power supply voltage, and the vehicle side. When the signal from the computer cannot be received, the power supply voltage supplied to the predetermined electronic circuit is controlled to OFF. That is, by turning on the power supply voltage supplied to the predetermined electronic circuit when the computer on the vehicle side is waked up, the predetermined electronic circuit is used even in a hybrid car (HV) or an automobile having an idling stop function while driving. be able to.

(10) Preferably, the power supply control device is provided with a connection means for connecting to the in-vehicle connector for self-diagnosis including the connection terminal for the in-vehicle communication network and the supply terminal for the power supply.

For example, it is preferable to provide a connecting means (for example, a connector corresponding to the in-vehicle connector such as OBD) that can be connected to the in-vehicle connector such as OBD exposed in the vehicle. The OBD in-vehicle connector is provided with a power supply terminal in addition to the in-vehicle communication network connection terminal, so even if the user does not have knowledge of in-vehicle wiring, the user can connect the power supply by himself / herself. It can be removed and installed without having to go to a maintenance shop.

Depending on the type of in-vehicle communication network adopted by the vehicle, the signal output from the vehicle-side computer to the in-vehicle communication network is output even if the response request signal from others is not received after the vehicle-side computer is started. Spontaneous output signal (spontaneous output signal: signal for CAN (Control Area Network), for example) and responsive output signal (response output signal: for example, K-) that is output only when a response request signal from another is received. There is a line signal).

Some vehicle-side computers are equipped with a self-diagnosis ((on-board diagnostics: OBD) I or II) system (software) that is essential due to exhaust gas regulations and the like. For example, when diagnosing an automobile engine, a scan tool for reading data is connected to the OBD in-vehicle connector exposed in the vehicle interior, and the scan tool outputs a signal from the vehicle-side computer to the in-vehicle communication network. To diagnose the failure. At that time, if the in-vehicle communication network connected to the vehicle-side computer is the above-mentioned CAN, the signal is spontaneously output, so it is analyzed that the signal is output from the vehicle-side computer by waiting for the signal. Just need it. However, if the in-vehicle communication network is the above-mentioned K-Line, the signal cannot be received only by waiting, so the response request signal is sent first and the signal output from the vehicle side computer is waited for.

General-purpose car accessories can be attached to any of a wide variety of automobiles. In addition to the above CAN and the above K-Line, the current domestic automobiles are selected from a wide variety of networks such as the company's own in-vehicle communication network, in-vehicle multimedia network, door and seat network, and security network. You are using any network. However, the self-diagnosis system uses either the CAN or K-Line signal output from the vehicle computer, and the OBD in-vehicle connector (connector in FIG. 3 described later) is used as the connector. Has been done. Therefore, either the CAN signal is received from the OBD in-vehicle connector to read that it is a signal from the vehicle-side computer, or the K-Line response request signal is sent to the OBD in-vehicle connector to send a response output signal. By receiving it, it is possible to know that the vehicle side computer is wake up. By connecting to the in-vehicle connector for self-diagnosis by connecting the power control device in this way, it is possible to supply power from other than the accessory socket, and to provide a power control device that can be attached to various vehicle models. it can.

(11) Preferably, a communication means, a noise detection means, and a control means may be provided in the housing having the connection means of the power supply control device.
By doing so, since the power supply control device includes the communication means, the noise detection means, and the control means in the housing having the connection means, the noise detection means is provided in a predetermined electronic circuit that receives power from the power supply control device. It is not necessary to provide a control means, and for example, a car accessory or the like can be miniaturized. Further, it is possible to eliminate a malfunction due to external noise being mixed into the power supply line between the car accessory and the car accessory, which may occur when the noise detecting means is provided in the car accessory and the like.

(12) Preferably, the control means of the power supply control device detects the spontaneous output signal from the vehicle-side computer by the communication means via the in-vehicle communication network, and is generated from the voltage of the power supply terminal by the noise detection means at the time of starting the vehicle. Noise is detected, a response request signal is sent to the vehicle-side computer by the communication means to the in-vehicle communication network, and a response output signal to the response request signal from the vehicle-side computer is detected by the communication means via the in-vehicle communication network. When a spontaneous output signal or a response output signal is detected from the in-vehicle communication network, it is preferable to start supplying the power supply voltage to the predetermined electronic circuit.

For example, the control means of the power supply control device first performs an operation of receiving the spontaneous output signal when the signal of the self-failure diagnosis from the vehicle side computer is a CAN signal by the communication means, and when the spontaneous output signal cannot be received. In addition, the noise detecting means detects the noise generated at the time of starting the vehicle, and when the noise generated at the time of starting the vehicle is detected, the communication means sends a K-Line response request signal to the computer on the vehicle side, and the K-Line is sent. Detects the response output signal of. By detecting the wake-up of the vehicle-side computer in this way, it is possible to prevent the vehicle-side computer from consuming unnecessary power by sending a response request signal of K-Line while the vehicle is not operating.

(13) Preferably, the control means of the power supply control device terminates the supply of the power supply voltage to the predetermined electronic circuit when the communication means cannot detect the spontaneous output signal or the response output signal from the in-vehicle communication network. Good.

The control means of the power control device stops the supply of the power supply voltage to the predetermined electronic circuit when the spontaneous output signal or the response output signal cannot be detected, and wastes power when the vehicle-side computer stops operating. You can avoid consuming it.

(14) Preferably, the control means of the power supply control device sends a response request signal when the communication means detects the spontaneous output signal and after the noise detection means detects the noise, and the response request signal is transmitted. When the response output signal to is detected, it is preferable to turn on the switch.
By doing so, in the power supply control device, whether the in-vehicle communication network on the vehicle side outputs a spontaneous output signal from the vehicle side computer or a type that outputs a response output signal, a predetermined electron is used only by one power supply control device. Power can be supplied to the circuit.

(15) It is preferable that the control means of the power supply control device sends a response request signal from the communication means with the noise detecting means detecting the noise generated at the time of starting the vehicle as a trigger.
By doing so, the power supply control device sends a response request signal triggered by noise generated when the vehicle is started. Therefore, in the case of a type in which the in-vehicle communication network on the vehicle side outputs a response output signal, the communication is reliably performed. A response request signal can be sent from the means.

(16) Preferably, the control means of the power supply control device includes a timer means for measuring a predetermined time, and a response output signal to the response request signal from the communication means within a predetermined time after the response request signal is transmitted from the communication means. It is advisable to turn on the switch when is detected.
By doing so, the power supply control device turns on the switch when the response output signal for the response request signal can be detected from the communication means within a predetermined time, so that even when the noise cannot be detected by the noise detecting means, it is predetermined. Power can be supplied to the electronic circuit of.

(17) Preferably, the control means of the power supply control device includes a timer means for measuring a predetermined time, and the next spontaneous output signal can be detected within a predetermined time after the communication means detects the previous spontaneous output signal. It is advisable not to turn off the switch.
By doing so, the power control device does not turn off the switch when the spontaneous output signal can be continuously detected from the communication means within a predetermined time, so that the electronic circuit is connected to the predetermined electronic circuit even while the battery is running or idling is stopped. Power supply can be continued.

(18) Preferably, the control means of the power supply control device includes a timer means for measuring a predetermined time, and when the noise detecting means can detect the next noise within a predetermined time after detecting the previous noise, it is preferable. It is advisable not to turn off the switch.
By doing so, the power supply control device does not turn off the switch when the noise detecting means can detect continuous noise such as alternator noise, so that the switch is not turned off while the engine of the automobile equipped with the engine is running. The power supply to a predetermined electronic circuit can be continued.

As described above, the power control device according to the present invention can supply power to a predetermined electronic circuit such as a car accessory from other than the accessory socket, and can be used for a wide variety of automobile car accessories and the like even while running on a battery or idling stop. Power supply power can be supplied to a predetermined electronic circuit.

It is a block diagram which shows an example of the in-vehicle communication network connected to the power supply control device of this invention. It is a block diagram which shows the schematic structure of an example of the power supply control device of this invention. It is a figure which shows the arrangement of the terminal pin of an OBD connector.

<First Embodiment>
The vehicle 1 in FIG. 1 is driven by the engine 2. The rotating shaft of the engine 2 is connected to the alternator 3 by a belt or the like. The alternator 3 generates AC power by rotating the armature. The generated AC power is rectified to direct current, and the direct current output terminal is connected to the positive electrode of the battery 4. The positive electrode of the battery 4 is connected to the power output pin of the OBD in-vehicle connector 6 (for example, Pin 16 in FIG. 3 described later). A power control device 30 is connected to the OBD in-vehicle connector 6, and a car accessory 20 is further connected to the power control device 30.

The engine sensor 12 and the engine sensor 13 are connected to the engine 2. The engine sensor 12 is a sensor that measures the rotation speed of the engine 2, and the engine sensor 13 is a sensor that measures the temperature of the engine 2. The tire 8 is the front tire, and the rotation sensor 10 is a sensor that detects the rotation of the tire 8. The tire 9 is a rear tire, and the rotation sensor 11 is a sensor that detects the rotation of the tire 9.

The in-vehicle communication network 7 is connected to a rotation sensor 10, a rotation sensor 11, an engine sensor 12, an engine sensor 13, various sensors (not shown), and the like, and is also connected to a vehicle-side computer 5. The rotation sensor 10, the rotation sensor 11, the engine sensor 12, the engine sensor 13, and the vehicle side computer 5 are energized and start operation when the ignition key of the vehicle 1 is turned on. The in-vehicle communication network 7 transmits the detection results of the rotation sensor 10, the rotation sensor 11, the engine sensor 12, the engine sensor 13, and the like to the vehicle-side computer 5. The vehicle-side computer 5 determines the state of the engine and the state of the vehicle based on the detection results from various sensors. The state of the vehicle includes running on a battery or idling stop.

The in-vehicle communication network 7 includes the case of CAN and K-Line described above, and also includes the case of a vehicle manufacturer's own standard network. For example, there are body-based vehicle manufacturer-specific standards LIN (Local Electronics Network), BEAN (Body Electronics Area Network), high-speed control system FlexRay, and information-based MOST (Media Oriented System).

When the in-vehicle communication network 7 is, for example, CAN, the above-mentioned signal indicating the state of the vehicle is spontaneously output from the vehicle-side computer 5 without receiving a response request signal from another. This signal is referred to as a spontaneous output signal in this specification. On the other hand, when the in-vehicle communication network 7 is, for example, K-Line, the above-mentioned signal indicating the state of the vehicle is output as a response from the vehicle-side computer 5 only when a response request signal from another is received. This signal is referred to as a response output signal in the present specification. Whether the spontaneous output signal is output from the vehicle-side computer 5 or the response output signal is output depends on the connected network. The vehicle manufacturer's proprietary network also outputs a spontaneous output signal or a response output signal.

The power input side connection connector 31 in FIG. 2 is a connector on the power control device 30 side for connecting to the OBD in-vehicle connector. The power control device 30 receives power from the battery 4, which is a power source, and transmits / receives signals to / from the computer 5 on the vehicle side via the power input side connector 31. The power output side connector 32 is a connector on the power control device 30 side for connecting to the power connection connector 21 of the car accessory 20. The power control device 30 supplies power to the car accessory 20 via the power output side connector 32.

Inside the power supply control device 30, the power supply power supplied from the power supply is supplied to the noise detection unit 33 and the relay switch 36.
The signal transmitted from the vehicle-side computer 5 is input to the communication unit 34 via the in-vehicle communication network 7. On the contrary, the communication unit 34 communicates with the vehicle side computer 5 via the in-vehicle communication network 7. The power supply power output from the relay switch 36 is supplied to the car accessory 20. The control unit 35 is connected to the noise detection unit 33, the communication unit 34, and the relay switch 36, and the detection result of the noise detection unit 33, the communication result by the communication unit 34, and the time measurement result of the timer unit 37 in the control unit 35. Therefore, it is determined whether the relay switch 36 is ON / OFF, and an ON / OFF signal is output. The relay switch 36 turns on / off the power supply voltage supplied from the power supply to the car accessory 20 according to this signal.

The noise detection unit 33 has an AC component passing circuit 41, a filter 42, an amplifier circuit 43, a rectifier circuit 44, and a DC conversion circuit 45, and detects noise from the power supply voltage. The noise is, for example, noise generated when the vehicle 1 is started and superimposed on the power supply voltage. In the case of the vehicle 1 having the engine 2, the noise generated at the start of the vehicle 1 and detected by the noise detection unit 33 is noise including a voltage drop generated at the start of the engine 2. If the vehicle 1 is not an engine 2 but a hybrid vehicle driven by a motor while running on a battery or an electric vehicle, the noise generated at the start of the vehicle 1 and detected by the noise detection unit 33 is the vehicle 1. It may be noise including a voltage drop generated when the power supply to the power supply is turned on.

The AC component passing circuit 41 removes the DC voltage component from the output voltage of the battery 4 and allows only the AC component to pass through. The filter 42 is a filter that extracts only signals in the target frequency band to be detected from the AC component output from the AC component passing circuit 41. The AC component passing circuit 41 is used by selecting from a low-pass filter, a band-pass filter, and a high-pass filter according to a target frequency to be detected. For example, the alternator noise component that changes in proportion to the engine speed is approximately 800 Hz to 8 KHz, and the noise component when the power of electrical components such as air conditioners, headlights, and crushers is turned on / off is higher than the alternator noise. Is also a high frequency band, the fluctuation component of the power supply voltage is a low band of several hundred Hz or less, and the voltage drop when the ignition key is turned on is a frequency in a lower band. Whether the vehicle 1 has the engine 2 or the electric vehicle, the noise including the voltage drop has a low frequency and can be detected by one filter. Hereinafter, when the ignition key is turned on for the frequency to be detected (when the vehicle 1 is driven by a motor instead of the engine 2 (when the hybrid vehicle is running on a battery or an electric vehicle), the motor is started). The case where it is the frequency of the voltage drop will be described.

The signal of the frequency band to be detected output from the filter 42 is amplified by the amplifier circuit 43, rectified by the rectifier circuit 44, converted into a DC voltage by the DC conversion circuit 45, and output to the control unit 35 as a control signal. .. The noise detection unit 33 can accurately detect the start of the vehicle 1 having the engine 2 by using the filter 42 as a filter capable of detecting noise in a low band frequency including a voltage drop, and also can accurately detect the start of the vehicle 1 of the electric vehicle. The start can also be detected accurately. The control signal output from the control unit 35 is either a voltage signal on the high level side or a voltage signal on the low level side with respect to the threshold value for turning on / off the relay switch 36. For example, when the voltage signal on the high level side is input, when the ignition key is turned on and the engine is started (when the vehicle 1 is driven by the motor instead of the engine 2 (when the hybrid vehicle is running on the battery or). In the case of an electric vehicle), since it is (when the motor is started), the control unit 35 outputs a signal for turning on the relay switch 36. On the other hand, when the voltage signal on the low level side is input, when the ignition key is OFF (including when only the vehicle side computer 5 is ON) or when ON is continued (including during idling stop) (vehicle). If 1 is driven by a motor instead of the engine 2 (when the hybrid vehicle is running on a battery or an electric vehicle, the motor is stopped), the control unit 35 is a communication unit. The following determination is made based on the input from 34 and the measurement result of the timer unit 37.

When the control unit 35 is connected to the vehicle-side computer 5 via the vehicle-side communication network 7, the in-vehicle communication network 7 is a network that outputs a spontaneous output signal from the vehicle-side computer 5 in advance, or responds to a response request signal. It is checked whether the network outputs a response output signal, and if the in-vehicle communication network 7 needs to output a response request signal by, for example, K-Line, communication is performed at predetermined time intervals measured by the timer unit 37. A response request signal is output from the unit 34 to the in-vehicle communication network 7. The predetermined time is determined by the standard / regulation for each type of in-vehicle communication network 7.

Further, the control unit 35 determines whether or not the vehicle 1 is in the driving state from the signal received from the vehicle side computer 5 by the communication unit 34 via the in-vehicle communication network 7. The control unit 35 controls ON / OFF of the relay switch 36 by using the received signal from the vehicle-side computer 5 and the noise detected by the noise detection unit 33. For example, the control unit 35 can determine that the vehicle 1 is in a driving state when it can receive a signal from the vehicle-side computer 5 even when the noise detection unit 33 does not detect the noise generated at the start of the vehicle 1. Therefore, the signal for turning off the relay switch 36 is not output. Therefore, the power supply control device of the present embodiment can supply the power supply voltage to the car accessory even while the battery is running or idling is stopped.

The control unit 35 described above operates at least as follows.
(A) The communication unit 34 performs an operation of receiving (detecting) a spontaneous output signal from the vehicle-side computer 5 via the in-vehicle communication network 7, for example, when the signal for self-failure diagnosis is a CAN signal, and the spontaneous output signal. If the signal cannot be received, the following operation (b) is performed.
(B) The noise detection unit 33 detects the noise generated when the vehicle 1 is started from the voltage of the power supply terminal, and when the noise generated when the vehicle 1 is started is detected, the next operation (c) is performed.
(C) The communication unit 34 sends, for example, a K-Line response request signal to the vehicle-side computer 5 to the vehicle-mounted communication network 7. That is, the control unit 35 sends a response request signal from the communication unit 34 to the vehicle side computer 5 via the in-vehicle communication network 7 with the noise detection unit 33 detecting the noise generated when the vehicle 1 is started as a trigger.
(D) The communication unit 34 detects the wake-up of the vehicle-side computer 5 by detecting the response output signal (for the response request signal) from the vehicle-side computer 5 via the in-vehicle communication network 7.
(E) When the spontaneous output signal or the response output signal is detected from the in-vehicle communication network 7, the supply of the power supply voltage to the car accessory 20 is started.

As described above, the control unit 35 sends a response request signal from the communication unit 34 using the noise as a trigger after the noise detection unit 33 detects the noise generated when the vehicle 1 is started, so that the in-vehicle communication on the vehicle 1 side is performed. When the network 7 is a type that outputs a response output signal, the response request signal can be reliably transmitted from the communication unit 34.

Further, the control unit 35 detects a response output signal for a response request signal when the communication unit 34 detects a spontaneous output signal and when the noise detection unit 33 detects noise generated when the vehicle 1 starts. By turning on the relay switch 36, a response request signal of K-Line is transmitted when the in-vehicle communication network 7 is CAN and when the vehicle side computer 5 in which the vehicle 1 is not started is not operating, and wasteful power is generated. It can be prevented from consuming, and the car accessory 20 can be used with only one power supply control device 30, regardless of whether the in-vehicle communication network 7 on the vehicle 1 side outputs a spontaneous output signal from the vehicle side computer 5 or a response output signal. Power supply Power can be supplied.

Further, the control unit 35 includes a timer unit 37 that measures a predetermined time, and after sending a response request signal from the communication unit 34 using the noise detected by the noise detection unit 33 as a trigger, the timer unit 37 measures the time. Then, the relay switch 36 is turned on when the timing for detecting the response output signal for the response request signal by the communication unit 34 is within a predetermined time specified in the timer unit 37. As a result, power can be supplied to the car accessory 20 even when noise cannot be detected by the noise detection unit 33 during battery operation or idling stop.

When the communication unit 34 detects the spontaneous output signal, the timer unit 37 measures the time after the communication unit 34 detects the spontaneous output signal. When the communication unit 34 detects the next spontaneous output signal within a predetermined time, the control unit 35 continues to turn on the relay switch 36 and does not turn it off. When the in-vehicle communication network 7 is CAN or the like, the spontaneous output signal from the vehicle-side computer 5 is output within a predetermined time, so that the time interval from the previous spontaneous output signal to the next spontaneous output signal is the in-vehicle communication network 7. By not turning off the relay switch 36 within a predetermined time specified in the standard, the power supply to the car accessory 20 can be continued even while the battery 4 is running or idling is stopped.

Further, when the communication unit 34 cannot detect the spontaneous output signal or the response output signal from the in-vehicle communication network 7, the control unit 35 controls the relay switch 36 to end the supply of the power supply voltage to the car accessory 20. Since the supply of the power supply voltage to the car accessory 20 is stopped, it is possible to prevent wasteful power consumption when the vehicle 1 is no longer in operation and the vehicle-side computer 5 does not operate.

The connector of the OBD in-vehicle connector 6 is, for example, a SAE J1962 standard link connector (DLCs) as shown in FIG. There are two types of DLC connectors, type A and type B. Type A is installed within 1 foot (about 30 cm) of the instrument panel of the car (near the steering column) within the range accessible from the driver's seat. Type B is installed within 2.5 feet (about 75 cm) of the instrument panel of the car (such as near the center console) within access from the driver's or passenger seat. The type of the in-vehicle communication network 7 can be known from the pin arrangement of the DLC connector (presence or absence of pins at each position) shown in FIG. If there is a terminal pin of Pin 7 of the OBD in-vehicle connector 6, it can be determined that the connector is connected to the K Line. If there are terminal pins of Pin 6 and 14 of the OBD in-vehicle connector 6, it can be determined that the connector is connected to CAN.

The method of determining the signal received from the vehicle-side computer 5 first determines which terminal pin of the OBD in-vehicle connector 6 of FIG. 3 is the signal. For example, when the in-vehicle communication network 7 is CAN, the pin 6 terminal pin (CAN High (J-2284) (3.5 to 2.5 V)) of the OBD in-vehicle connector 6 and the pin 14 terminal pin (CAN Low (J-2284)). ) (2.5 to 1.5V)). When this signal is input to the communication unit 34, the control unit 35 determines that it is a CAN signal because it is an input of, for example, Pin6 and Pin14, and determines that it is a CAN signal, and the level of each CAN signal of the Pin6 and Pin14 (the header of Pin4). (Based on the sea ground level) is compared and confirmed, and further, the source address and the like included in the header of each received CAN signal are analyzed to determine that the signal is output from the vehicle-side computer 5. When it can be confirmed that the vehicle-side computer 5 is waked up, the control unit 35 outputs a signal to turn on the relay switch 36 and supplies the power supply voltage of the terminal pin (Battery Power) of the Pin 16 to the car accessory 20. ..

For example, when the in-vehicle communication network 7 is K-Line, the control unit 35 sends a response request signal from the communication unit 34 to the vehicle-side computer 5 to the terminal pin (ISO9141-2 K Line) of Pin 7 of the OBD in-vehicle connector 6. It sends out, activates the timer unit 37, and waits for the response output signal from the vehicle-side computer 5. When a signal from the vehicle-side computer 5 is input, the control unit 35 determines that it is a K Line signal because it is an input of, for example, Pin 7 to the communication unit 34, and sets the level of the K Line signal to the chassis ground of Pin 4. When the signal is received within the predetermined time specified in the K-Line standard from the time from the transmission of the response request signal measured by the timer unit 37 to the input of the signal after checking by comparing with the level. Judged as a response output signal. In order to more reliably confirm that the received signal is the response output signal from the vehicle-side computer 5, the address of the transmission source included in the header of each received K Line signal may be analyzed. When it can be confirmed that the vehicle-side computer 5 is waked up, the control unit 35 outputs a signal to turn on the relay switch 36 and supplies the power supply voltage of the terminal pin (Battery Power) of the Pin 16 to the car accessory 20. ..

The OBD in-vehicle connector 6 as shown in FIG. 3 is provided in most vehicles 1. Normally, it is not easy to connect to the in-vehicle communication network 7 and to connect the power supply from other than the cigarette lighter (accessory socket), but like the power input side connector 31 of this embodiment, the connection terminal for the in-vehicle communication network 7. By providing a connection means for connecting to the OBD in-vehicle connector 6 for self-diagnosis including the power supply terminal and the power supply terminal, even if the user does not have knowledge of the in-vehicle wiring of the automobile, the user himself can connect and disconnect the power supply. Can be installed without having to go to a maintenance shop.

Further, a general car accessory is connected to a cigarette lighter (accessory socket) or a power supply line of the vehicle 1. In order to prevent the battery of a parked vehicle from running out due to the car accessory, it is necessary to provide, for example, a noise detection unit 33 and a relay switch 36 inside the car accessory. On the other hand, in the present embodiment, as shown in FIG. 2, the communication unit 34 and the noise detection unit are contained in the housing having the connection means power input side connection connector 31 and the power output side connection connector 32 of the power supply control device 30. It includes 33, a control unit 35, a relay switch 36, and a timer unit 37. As a result, it is not necessary to provide a noise detection unit 33 or the like in the car accessory 20 that receives power from the power control device 30, the car accessory 20 can be miniaturized, and external noise is generated in the power supply line between the car accessory 20 and the car accessory 20. It is possible to eliminate malfunctions caused by mixing of noise.

In this way, the ON / OFF control of the power supply voltage supplied to the car accessory 20 is not determined only by the noise as in the conventional case, and the signal output from the vehicle side computer 5 to the in-vehicle communication network 7 when the noise cannot be detected is also used. This makes it possible to determine that the vehicle 1 is running on the battery 4 or is idling stopped, which was not possible in the past. Therefore, in a hybrid car (HV) or a vehicle 1 with an engine 2 having an idling stop function, power can be reliably supplied to the car accessory 20 even if the function of stopping the engine during driving is used, and the engine 2 can be reliably supplied. The noise detection unit 33 can accurately detect not only the restart of the vehicle 1 but also the start of the vehicle 1 due to the battery running.

<Second Embodiment>
For example, when the vehicle 1 has a security function such as an immobilizer, it is necessary to release the security function of the vehicle 1 and start the vehicle 1 in order to generate noise including a voltage drop at the time of starting from the vehicle 1. Otherwise, the security function of the vehicle 1 will erroneously determine that the process of starting the vehicle has been stolen.

For example, when the security function of the vehicle 1 is turned on and the running cannot be started, the control unit 35 of the second embodiment is not output from the vehicle side computer 5, and the security function is turned off and the running can be started. A predetermined signal output from the vehicle-side computer 5 is detected via the communication unit 34 only when. The control unit 35 confirms that the communication unit 34 has received the predetermined signal from the vehicle-side computer 5, that is, the communication unit 34 is in a state where the predetermined signal cannot be received, and then the communication unit 35 can receive the predetermined signal. When the noise detection unit 33 detects the noise generated when the vehicle 1 is started, it outputs a signal for turning on the relay switch 36. As a result, it is possible to reliably prevent erroneous determination of the security function.

<Third Embodiment>
The vehicle 1 is usually equipped with a plurality of in-vehicle communication networks 7. The plurality of in-vehicle communication networks 7 are, for example, the above-mentioned CAN, K Line, and the original standards (LIN, BEAN, etc.) of each manufacturer. The in-vehicle communication network 7 of each manufacturer's original standard is also either a type that outputs a spontaneous output signal or a type that outputs a response output signal. The communication unit 34 of the third embodiment includes both an in-vehicle communication network 7 that outputs a spontaneous output signal from the vehicle-side computer 5 and an in-vehicle communication network 7 that outputs a response output signal from the vehicle-side computer 5 unlike the above. It is connected. The communication unit 34 communicates with the vehicle-side computer 5 via the in-vehicle communication network 7 of either of the above. Which of the two in-vehicle communication networks 7 the vehicle-side computer 5 is connected to depends on the manufacturer and the vehicle type.

Since the type of vehicle to be installed is not limited, the power control device 30 that supplies power to the car accessory needs to be versatile. To have versatility is to make it compatible with both the in-vehicle communication network 7 of the spontaneous output signal and the in-vehicle communication network 7 of the response output signal. More specifically, at least the communication unit 34 can be connected to both the in-vehicle communication network 7 of the spontaneous output signal and the in-vehicle communication network 7 of the response output signal. In this way, in the case of the present embodiment, even with one power supply control device 30, the vehicle type in which the in-vehicle communication network 7 uses the spontaneous output signal and the vehicle type in which the response output signal is used can be used. Power can be supplied to the car accessory 20.

<Fourth Embodiment>
In the fourth embodiment, in addition to the configuration in which the communication unit 34 can connect to and communicate with a plurality of different in-vehicle communication networks 7 as in the third embodiment described above, the control unit 35 is connected to the communication unit 34. It monitors a plurality of connected different in-vehicle communication networks 7. Then, the control unit 35 detects which of a plurality of different in-vehicle communication networks 7 to which the communication unit 34 can communicate is connected, and the communication unit 34 can communicate with the in-vehicle communication network. ON / OFF of the relay switch 36 is determined using the information from 7.

Since the control unit 35 of the present embodiment can detect and use the in-vehicle communication network 7 capable of communicating among a plurality of different in-vehicle communication networks 7 connected to the communication unit 34, a wide variety of in-vehicle communication networks 7 can be used. It is possible to supply power to the car accessory 20 with only one power control device 30 for the vehicle model to have.

<Fifth Embodiment>
Since no noise is generated from the engine when the electric vehicle EV or the hybrid car (HV) is running on the battery or when the vehicle with the engine is idling stopped, the noise is not detected by the noise detection unit 33. Therefore, the control unit 35 of the fifth embodiment does not use the output signal of the noise detection unit 33, but turns on the relay switch 36 when the signal from the vehicle side computer 5 is received, and receives the signal from the vehicle side computer 5. When it becomes impossible, the relay switch 36 is turned off. That is, the control unit 35 of the present embodiment turns on the power supply voltage supplied to the car accessory 20 when the signal from the vehicle side computer 5 is received, not when noise is detected from the power supply voltage, and the vehicle side computer 5 sends the power supply voltage. The power supply voltage supplied to the car accessory 20 is controlled to be OFF when the signal cannot be received.

When the signal from the vehicle-side computer 5 can be received, the vehicle-side computer 5 is naturally supplied with power and wakes up. When the vehicle-side computer 5 is waked up, it is considered that there is a demand for car accessories when the vehicle is running or when there is an occupant in the vehicle 1 and the ignition key is turned on. The signal from the vehicle-side computer 5 can be determined by using the method described in the first embodiment. By turning on the power supply voltage supplied to the car accessory 20 when the vehicle-side computer 5 is waked up as described above, even a hybrid car (HV) or a car having an idling stop function is running or a vehicle. If there is an occupant in 1, the car accessory 20 can be used.

<Sixth Embodiment>
For example, the vehicle 1 is equipped with the engine 2, and the timer unit 37 measures the period of the maximum generation interval of noise generated by the armature of the alternator, which fluctuates depending on the engine speed, as a predetermined time, and filters the noise detection unit 33. 42 is changed to a filter that matches the noise frequency of the alternator. Then, the control unit 35 does not turn off the relay switch 36 if the noise detection unit 33 can detect the next noise within a predetermined time after the noise detection unit 33 detects the previous noise. To do so.

In the case of the present embodiment, the relay switch 36 is not turned off while the noise detection unit 33 detects continuous noise such as alternator noise. Therefore, in the vehicle 1 equipped with the engine 2, power can be continuously supplied to the car accessory 20 while the engine 2 is running.
<Another Embodiment>
(1) The power supply control device 30 may be provided inside the car accessory. For example, the power supply control device 30 may be provided inside the main body of a car accessory such as a radar detector or a fuel consumption meter.
(2) The power supply control device 30 may be provided in a housing integrated with the OBD in-vehicle connector 6.
(3) The power supply is not limited to the one obtained from the OBD in-vehicle connector 6, and various configurations such as a configuration obtained directly from the battery can be adopted.

1 vehicle,
2 engine,
3 Alternator,
4 battery,
5 Vehicle side computer,
6 OBD (On-Board diagnostics) in-car connector,
7 In-car communication network,
8, 9 tires,
10, 11 rotation sensor,
12, 13 Engine sensors (vibration, heat, rotation),
20 car accessories,
21 power connector,
30 power control unit,
31 Power input side connector,
32 Power output side connector,
33 Noise detection unit (noise detection means),
34 Communication unit (communication means),
35 Control unit (control means),
36 Relay switch (switch),
37 Timer section (timer means),
41 AC component passing circuit,
42 filters,
43 Amplifier circuit,
44 Rectifier circuit,
45 DC conversion circuit.

Claims (2)

If the vehicle transmits a response request signal to the vehicle-side computer as a trigger the detection of the noise generated at the time of starting to detect the response output signal for the response request signal from the vehicle computer, is supplied from the vehicle that the power supply control apparatus having a function for controlling to start the supply to the car accessory side of the power. It is a power supply control device that controls to start supplying electric power supplied from the vehicle side to the car accessory side when a predetermined signal from the in-vehicle communication network is detected.
The function to detect the spontaneous output signal from the in-vehicle communication network and
A function of sending a response request signal to the computer on the vehicle side by using the detection of noise generated at the time of starting the vehicle as a trigger when the spontaneous output signal is not detected.
A function of detecting a response output signal to the response request signal from the vehicle-side computer, and
A function of controlling to start the supply when the spontaneous output signal is detected and when the response output signal is detected, and
Power control unit with.

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