JP2022116084A - Power supply control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control device that can supply electric power to car accessories for various kinds of vehicles during a battery traveling and idling stop.

SOLUTION: A device includes: a communication unit 34 for communicating with a vehicle-side computer 5 via an in-vehicle communication network 7; a noise detection unit 33 for detecting noise generated from power supply voltage upon starting of a vehicle; a relay switch 36 for turning the power supply voltage on/off which is supplied from a power supply to a car accessory 20; and a control unit 35 for using a signal from the vehicle-side computer 5 received by the communication unit 34 and the noise detected by the noise detection unit 33 to control on/off of the relay switch 36.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a power control device for a car accessory or the like that is added by a user to the interior of a car after factory shipment, such as a retrofitted car accessory, particularly when the car is running or ready to run. The present invention relates to a power control device that supplies power to a car accessory or the like only at certain times.

In general, around the driver's seat or around the rear seat of a car, there is a power connection socket (cigarette socket or accessory socket: hereinafter referred to as an accessory socket). Depending on the manufacturer and type of car, the accessory socket may have a power supply that can be turned on when the car key (ignition switch) is in the ACC (accessory) position, or the power supply will remain on regardless of the ignition switch position. There is something to be done.

For example, if a car has an accessory socket that keeps the power supply ON, and a car accessory that continuously uses power is installed (power is supplied from the accessory socket), the battery may run out due to long-term parking. . In order to prevent such car accessories from draining the battery, there is a known power control device that does not supply power from an accessory socket to car accessories when a power generator (alternator) interlocked with the engine is not operating. (See Patent Document 1, for example). In Patent Literature 1, it is detected that the power generator (or the engine) is in an operating state by alternator noise of the power generator superimposed on the output voltage of the battery.

In recent years, several manufacturers have released hybrid vehicles (HVs) equipped with both a driving motor and an engine. be. There are also vehicles on the market with an idling stop function that temporarily stops the engine while waiting for a signal at an intersection, etc., and quickly starts the engine when the signal turns green and the accelerator is stepped on.

JP-A-11-222084

A standard general automobile basically has one accessory socket, and even a luxury car or a large car with a large passenger capacity has two to three accessory sockets. On the other hand, car accessories basically require one accessory socket for one car accessory. There is

Also, in the case of a vehicle that can run on a battery alone or a vehicle with an idling stop function, the generator does not operate during battery running or idling stop, so no alternator noise is generated. In such a vehicle, if the power source of the car accessory is controlled by the power control device of Patent Document 1, the car accessory cannot be used while the vehicle is running on the battery or while the engine is stopped by the idling stop function.

Therefore, in order to solve the above problems, the present invention is a power supply that can supply power from a socket other than an accessory socket, and can supply power to various car accessories of automobiles even during battery running or idling stop. The object is to provide a control device.

(1) In order to solve the above problems, the power supply control device includes communication means for communicating with the vehicle-side computer via an in-vehicle communication network, noise detection means for detecting noise from the power supply voltage, and a predetermined electronic signal from the power supply. A switch for turning ON/OFF the power supply voltage supplied to the circuit, and a control means for controlling ON/OFF of the switch using a signal from the vehicle-side computer received by the communication means and noise detected by the noise detection means. Prepare.

In the power control device, the signal output from the vehicle computer to the in-vehicle communication network is used for ON/OFF control of the power supply voltage supplied to the predetermined electronic circuit. When noise cannot be detected, the signal received from the vehicle-side computer can be used to supply power to predetermined electronic circuits.
The predetermined electronic circuit may be, for example, an electronic circuit provided inside a car accessory or the like. Moreover, it is particularly preferable to incorporate the present power supply control device, for example, in the connector of the power supply.
Alternatively, a predetermined electronic circuit and the present power control device may be incorporated in a car accessory or the like.

(2) Preferably, the noise detection means of the power supply control device detects noise generated when the vehicle is started.

For example, in the case of a vehicle equipped with an engine, the noise generated when the vehicle is started may be the noise generated when the vehicle is started due to the voltage drop caused by the engine starter, rather than the noise generated by the alternator of the power generator as in the conventional art. . Alternator noise is noise that remains after rectification due to the operation of the AC power generator, so while the noise level is relatively low at a relatively high frequency, the noise generated when the vehicle is started is a noise generated by other electrical components. Noise detection errors are reduced because the noise is relatively large in level over a relatively long period of time due to a starter that uses such a large amount of power that the voltage drops even when all are stopped. In addition, for example, in the case of a vehicle such as an electric vehicle or a hybrid vehicle, the noise that is generated when the vehicle is started includes the noise that is generated when power supply to each part of the vehicle is started. For example, if a vehicle such as an electric vehicle or a hybrid vehicle starts supplying power when communication with a transmitter owned by the driver is established, is there noise with the same pattern as the noise generated at this time? should be judged. As this noise, it is preferable to detect noise due to a voltage drop. By using the signal received from the vehicle-side computer and the noise generated when the vehicle is started with few detection errors, power can be reliably supplied to predetermined electronic circuits after the vehicle is started.

(3) Preferably, the control means of the power supply control device does not turn off the switch when the signal from the vehicle-side computer can be received even if the noise detection means does not detect noise generated when the vehicle is started. should be

In this way, the power control device can supply power to a predetermined electronic circuit even during battery running or idling stop. This is because in a hybrid vehicle (HV) or an automobile having an idling stop function, the vehicle computer wakes up and outputs speed information, driving-related information, etc. even during battery running or idling stop. .

(4) Preferably, in the power supply control device, the noise generated when the vehicle is started is noise including a voltage drop that occurs when the engine of a vehicle having an engine is started.
By doing so, the noise detecting means can accurately detect the starting of the vehicle having the engine.

(5) Preferably, in the noise detection means of the power supply control device, the noise generated when the vehicle is started is noise including a voltage drop that occurs when the power supply to the electric vehicle is turned on. .
By doing so, the noise detection means can accurately detect the start 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 noise generated when the vehicle is started after the signal from the vehicle-side computer is received by the communication means. You should try to

In this way, the power supply control device can reliably prevent erroneous determination by turning on the switch when noise is detected after the communication means receives the signal from the vehicle-side computer. 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 starting the vehicle at which vehicle noise occurs. Therefore, noise is detected after receiving this signal. By turning on the switch when the vehicle has a security function, an erroneous determination can be reliably prevented. After the signal from the vehicle-side computer can be received is preferably after the state where the signal from the vehicle-side computer cannot be received becomes the state where the signal from the vehicle-side computer can be received. It is particularly preferable that the signal received from the vehicle-side computer is a signal that is not output when the vehicle is in a state in which it is impossible to start running.

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

By doing so, the power supply control device can use a single network for both the vehicle type with the in-vehicle communication network using the spontaneous output signal and the vehicle type with 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 that is actively output from the vehicle-side computer, and the response output signal is a signal that is passively output from the vehicle-side computer only when a response request is received.

(8) Preferably, the communication means of the power control device is configured to be capable of communicating by connecting to a plurality of different in-vehicle communication networks, and the control means monitors the plurality of different in-vehicle communication networks connected to the communication means. Then, it is preferable that the communication means of a plurality of different in-vehicle communication networks use the information from the in-vehicle communication networks with which communication is possible to determine whether the switch is ON/OFF.

By doing so, the power supply control device uses an in-vehicle communication network capable of communicating among a plurality of different in-vehicle communication networks. supply power to the electronic circuitry of

(9) Preferably, the control means of the power supply control device turns on the switch when a signal from the vehicle computer is received, and turns off the switch when the signal from the vehicle computer cannot be received.

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

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

For example, it is preferable to provide a connection means (for example, a connector corresponding to an in-vehicle connector such as an OBD) that can be connected to an in-vehicle connector such as an OBD exposed inside the vehicle. Since the OBD in-vehicle connector is provided with a terminal for power supply in addition to the connection terminal with the in-vehicle communication network, the user can connect the power supply by himself even if he has no knowledge of the in-vehicle wiring. It can be removed and installed without the need to go to a repair shop.

Depending on the type of in-vehicle communication network used by the vehicle, the signal output from the vehicle-side computer to the in-vehicle communication network is output even if no response request signal is received from other sources after the vehicle-side computer is started. Spontaneous output signal (spontaneous output signal: for example CAN (Controller Area Network) signal) and responsive output signal (response output signal: for example K- line signal).

Some vehicle-side computers are equipped with a system (software) for self-diagnosis ((on-board diagnosis: OBD) I or II), which is required by exhaust gas regulations and the like. For example, when diagnosing an automobile engine, a scan tool for data reading is connected to the OBD in-vehicle connector exposed in the vehicle interior, and the scan tool outputs signals from the vehicle-side computer to the in-vehicle communication network. to diagnose faults. 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. Just However, if the in-vehicle communication network is the above-mentioned K-Line, the signal cannot be received by just waiting, so the response request signal is sent out first, and the signal output in response from the vehicle-side computer is awaited.

A universal car accessory may be installed on any of a wide variety of automobiles. In addition to the above CAN and K-Line, current domestic automobiles are selected from a wide variety of networks such as their own in-vehicle communication network, in-vehicle multimedia network, door and seat network, and security network. 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 (the connector in FIG. 3 described later) is used as the connector. It is Therefore, either the CAN signal is received from the OBD in-vehicle connector and it is determined that the signal is from the vehicle side computer, or the K-Line response request signal is sent to the OBD in-vehicle connector and the response output signal is output. By receiving this, it is possible to know that the vehicle-side computer is waking up. In this way, by connecting the connecting means of the power control device to the in-vehicle connector for self-diagnosis, power can be supplied from a socket other than the accessory socket. can.

(11) Preferably, the housing having the connection means of the power supply control device includes communication means, noise detection means, and control means.
With this configuration, the power supply control apparatus includes the communication means, the noise detection means, and the control means in the housing having the connection means. This eliminates the need to provide a control means, so that, for example, car accessories can be miniaturized. In addition, it is possible to eliminate malfunctions caused by external noise mixed in the power supply line between the car accessory and the like, which may occur when the noise detection means is provided in the car accessory or the like.

(12) Preferably, the control means of the power supply control device detects the spontaneous output signal from the vehicle-side computer via the in-vehicle communication network by the communication means, and the noise detection means generates from the voltage of the power supply terminal when the vehicle is started. Detecting noise, sending a response request signal to the vehicle-side computer to the in-vehicle communication network by the communication means, detecting a response output signal in response to the response request signal from the vehicle-side computer through the in-vehicle communication network by the communication means, The supply of power supply voltage to a predetermined electronic circuit may be started when a spontaneous output signal or a response output signal is detected from the in-vehicle communication network.

For example, the control means of the power supply control device first receives a spontaneous output signal when the signal for self-diagnosis from the vehicle-side computer is a CAN signal. Then, the noise detection means detects noise generated when the vehicle is started, and when the noise generated when the vehicle is started is detected, the communication means sends a K-Line response request signal to the vehicle-side computer, and the K-Line to detect the response output signal of By detecting the wake-up of the vehicle computer in this way, it is possible to prevent wasteful power consumption by sending a K-Line response request signal while the vehicle computer 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 supply control device stops the supply of power supply voltage to a predetermined electronic circuit when the spontaneous output signal or 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 from the communication means when the communication means detects the spontaneous output signal and after the noise detection means detects noise, and the response request signal It is preferable to turn on the switch when the response output signal is detected.
By doing so, in the power control device, even if 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, only one power control device can Supply power to the circuit.

(15) Preferably, the control means of the power supply control device sends out a response request signal from the communication means when the noise detection means detects noise generated when the vehicle is started.
With this configuration, the power supply control device sends out a response request signal triggered by noise generated when the vehicle is started. A response request signal can be sent from the means.

(16) Preferably, the control means of the power supply control device includes timer means for measuring a predetermined time, and outputs a response output signal to the response request signal from the communication means within a predetermined time after the response request signal is sent from the communication means. is detected, the switch should be turned on.
With this configuration, the power supply control device turns on the switch when the response output signal to the response request signal from the communication means can be detected within the predetermined time. can supply power to the electronic circuits of

(17) Preferably, the control means of the power supply control device includes timer means for measuring a predetermined time, and the communication means can detect the next spontaneous output signal within a predetermined time after detecting the previous spontaneous output signal. Therefore, it is better not to turn off the switch.
By doing so, the power supply control device does not turn off the switch when the spontaneous output signal from the communication means can be continuously detected within a predetermined time. power supply can be continued.

(18) Preferably, the control means of the power supply control device includes timer means for measuring a predetermined time, and if the noise detection means can detect the next noise within a predetermined time after detecting the previous noise, Do not turn off the switch.
By doing so, the power supply control device does not turn off the switch when the noise detection means can detect continuous noise such as alternator noise, so while the engine of an automobile equipped with an engine is running, the switch is not turned off. Power can continue to be supplied to certain electronic circuits.

As described above, the power supply control device according to the present invention can supply power to predetermined electronic circuits such as car accessories from other than the accessory socket. Power supply power can be supplied to certain electronic circuits.

1 is a block diagram showing an example of an in-vehicle communication network connected to a power control device of the present invention; FIG. 1 is a block diagram showing a schematic configuration of an example of a power supply control device of the present invention; FIG. It is a figure which shows arrangement|positioning of the terminal pin of an OBD connector.

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

An engine sensor 12 and an 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 . A tire 8 is a front tire, and a rotation sensor 10 is a sensor for detecting rotation of the tire 8 . A tire 9 is a rear tire, and a rotation sensor 11 is a sensor for detecting rotation of the tire 9 .

The in-vehicle communication network 7 is connected to the rotation sensor 10 , the rotation sensor 11 , the engine sensor 12 , the engine sensor 13 , various sensors (not shown), etc., and is also connected to the vehicle-side computer 5 . The rotation sensor 10, the rotation sensor 11, the engine sensor 12, the engine sensor 13, etc., and the vehicle-side computer 5 are energized and start operating when the ignition key of the vehicle 1 is turned on. The in-vehicle communication network 7 transmits 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 battery running and idling stop.

The in-vehicle communication network 7 includes the above-described CAN and K-Line, and also includes a network of the original standard of the vehicle manufacturer. For example, there are LIN (Local Interconnect Network) and BEAN (Body Electronics Area Network) that are unique to vehicle manufacturers for body systems, FlexRay for high-speed control systems, and MOST (Media Oriented System Transport) for information systems.

If the in-vehicle communication network 7 is CAN, for example, the above-described signal indicating the state of the vehicle is spontaneously output from the vehicle-side computer 5 without receiving a response request signal from others. This signal is called a spontaneous output signal in this specification. On the other hand, if the in-vehicle communication network 7 is, for example, K-Line, the above-described signal indicating the state of the vehicle is output as a response from the vehicle-side computer 5 only when a response request signal is received from another source. This signal is called a response output signal in this specification. Whether the vehicle-side computer 5 outputs a spontaneous output signal or a response output signal depends on the connected network. A vehicle manufacturer's proprietary network also outputs a spontaneous output signal or a responsive output signal.

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

Inside the power supply control device 30 , the power supplied from the power supply is supplied to the noise detector 33 and the relay switch 36 .
A signal transmitted from the vehicle-side computer 5 is input to the communication unit 34 via the in-vehicle communication network 7 . Conversely, 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 of the communication unit 34, and the time measurement result of the timer unit 37 in the control unit 35. determines whether to turn the relay switch 36 ON or OFF, and outputs a signal indicating ON or OFF. 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 section 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 when the vehicle 1 is started and detected by the noise detection unit 33 is noise including a voltage drop generated when the engine 2 is started. If the vehicle 1 is a hybrid vehicle that is driven by a motor instead of the engine 2 and is running on a battery or an electric vehicle, the noise generated when the vehicle 1 is started and detected by the noise detection unit 33 is The noise including the voltage drop that occurs when the power supply to the is turned on.

The AC component passing circuit 41 removes the DC voltage component from the output voltage of the battery 4 and passes only the AC component. The filter 42 is a filter that extracts only the signal in the frequency band to be further detected from the AC component output from the AC component passing circuit 41 . The AC component pass circuit 41 is used by selecting from a low-pass filter, a band-pass filter, and a high-pass filter according to the target frequency to be detected. For example, the alternator noise component that changes in proportion to the engine speed is roughly 800 Hz to 8 KHz, and the noise component when turning on/off electrical equipment such as air conditioners, headlights, and horns is more than the alternator noise. is also in a high frequency band, the fluctuation component of the power supply voltage is in a low band of several hundred Hz or less, and the voltage drop when the ignition key is turned on is in an even lower frequency band. In both the case where the vehicle 1 has the engine 2 and the case of the electric vehicle, the noise including the voltage drop is in the low band frequency, so it can be detected with one filter. Below, the target frequency to be detected is when the ignition key is turned on (when the vehicle 1 is driven by a motor instead of the engine 2 (during battery driving of a hybrid vehicle or an electric vehicle), when the motor is started). A case of the voltage drop frequency will be described.

A signal in a frequency band to be detected output from the filter 42 is amplified by the amplifier circuit 43, rectified by the rectifier circuit 44, converted to a DC voltage by the DC converter circuit 45, and output to the controller 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 a filter capable of detecting noise in a low frequency band including a voltage drop as the filter 42, and can detect the start of the vehicle 1 as an electric vehicle. Starting can also be accurately detected. 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 a high-level voltage signal is input, when the ignition key is turned on to start the engine (when the vehicle 1 is driven by a motor instead of the engine 2 (when a hybrid vehicle runs on battery or If the vehicle is an electric vehicle, the motor is started), so the control unit 35 outputs a signal to turn on the relay switch 36 . On the other hand, when a low-level voltage signal is input, the ignition key is turned off (including when only the vehicle computer 5 is turned on) or when it is continuously turned on (including during idling stop) (vehicle 1 is driven by the motor instead of the engine 2 (when the motor is stopped if the hybrid vehicle is running on battery or is an electric vehicle), the control unit 35 Based on the input from 34 and the measurement result of the timer section 37, the following judgments are made.

When the control unit 35 is connected to the vehicle-side computer 5 via the in-vehicle 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. 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 standards/regulations for each type of in-vehicle communication network 7 .

Further, the control unit 35 determines whether the vehicle 1 is being driven based on a signal received from the vehicle computer 5 by the communication unit 34 via the in-vehicle communication network 7 . The controller 35 controls ON/OFF of the relay switch 36 using the signal received from the vehicle-side computer 5 and the noise detected by the noise detector 33 . For example, even if the noise detector 33 does not detect noise generated when the vehicle 1 is started, the controller 35 can determine that the vehicle 1 is in a driving state when a signal from the vehicle computer 5 can be received. 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 during battery running or idling stop.

The control unit 35 described above operates at least as follows.
(a) The communication unit 34 receives (detects) a spontaneous output signal from the vehicle-side computer 5 via the in-vehicle communication network 7 when, for example, the signal for self-diagnosis is a CAN signal, and the spontaneous output signal is received. is not received, the following operation (b) is performed.
(b) The noise detector 33 detects 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 following operation (c) is performed.
(c) The communication unit 34 sends a K-Line response request signal, for example, to the in-vehicle communication network 7 to the vehicle-side computer 5 . 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, triggered by the noise detection unit 33 detecting noise generated when the vehicle 1 is started.
(d) Wake-up of the vehicle computer 5 is detected by detecting a response output signal (with respect to the response request signal) from the vehicle computer 5 by the communication unit 34 via the in-vehicle communication network 7 .
(e) Start supplying power supply voltage to the car accessory 20 when a spontaneous output signal or a response output signal is detected from the in-vehicle communication network 7 .

As described above, after the noise detection unit 33 detects noise generated when the vehicle 1 is started, the control unit 35 uses the noise as a trigger to transmit a response request signal from the communication unit 34, thereby enabling in-vehicle communication on the vehicle 1 side. If the network 7 is of a type that outputs a response output signal, the response request signal can be reliably sent from the communication section 34 .

In addition, when the communication unit 34 detects a spontaneous output signal and when the noise detection unit 33 detects a noise generated when the vehicle 1 is started, the control unit 35 detects a response output signal in response to a response request signal. By turning ON the relay switch 36, when the in-vehicle communication network 7 is CAN and when the vehicle-side computer 5 is not operating when the vehicle 1 is not started, a K-Line response request signal is sent to save power. The in-vehicle communication network 7 on the vehicle 1 side outputs a spontaneous output signal from the vehicle computer 5 or a response output signal to the car accessory 20 with only one power supply control device 30. Power supply power can be supplied.

Further, the control unit 35 is provided with a timer unit 37 for measuring a predetermined time. After the response request signal is sent from the communication unit 34 with the noise detected by the noise detection unit 33 as a trigger, the timer unit 37 measures the time. Then, when the timing at which the communication section 34 detects the response output signal to the response request signal is within the predetermined time defined by the timer section 37, the relay switch 36 is turned on. As a result, power can be supplied to the car accessory 20 even when noise cannot be detected by the noise detector 33, such as during battery running 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 keeps the relay switch 36 ON 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. Power supply to the car accessory 20 can be continued even during running of the battery 4 or idling stop by not turning off the relay switch 36 within a predetermined time defined by the standard.

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 power supply voltage to the car accessory 20. Since the supply of power supply voltage to the car accessory 20 is stopped, wasteful power consumption can be avoided when the vehicle computer 5 stops operating because the vehicle 1 is not in operation.

The connectors of the OBD in-vehicle connector 6 are, for example, SAE J1962 standard link connectors (DLCs) as shown in FIG. There are two types of DLC connectors: type A and type B. Type A is installed within one foot (approximately 30 cm) of the vehicle's instrument panel (near the steering column), accessible from the driver's seat. Type B is installed within 2.5 feet (approximately 75 cm) of the instrument panel of the vehicle (such as near the center console) within a range that can be accessed from the driver's or front passenger's seat. The type of in-vehicle communication network 7 can be known from the pin arrangement of the DLC connector shown in FIG. 3 (the presence or absence of pins at each position). If there is a terminal pin of Pin7 of the OBD in-vehicle connector 6, it can be determined that it is connected to the K Line. If there are terminal pins 6 and 14 of the OBD in-vehicle connector 6, it can be determined that it is connected to CAN.

The method of determining the signal received from the vehicle-side computer 5 is to first determine which terminal pin of the OBD in-vehicle connector 6 in FIG. 3 the signal is from. For example, when the in-vehicle communication network 7 is CAN, the terminal pin of Pin 6 (CAN High (J-2284) (3.5 to 2.5 V)) and the terminal pin of Pin 14 (CAN Low (J-2284 ) (2.5 to 1.5 V)). When this signal is input to the communication unit 34, the control unit 35 determines that it is a CAN signal because it is input to Pin6 and Pin14, for example. See ground level as a reference) is compared and confirmed, and the source address, etc. included in the header of each received CAN signal is analyzed to determine that the signal is output from the vehicle-side computer 5 . When it is confirmed that the vehicle-side computer 5 is awake, 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 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 for the vehicle-side computer 5 from the communication unit 34 to the pin 7 terminal pin (ISO9141-2 K Line) of the OBD in-vehicle connector 6. Then, the timer unit 37 is activated and a response output signal from the vehicle-side computer 5 is waited for. When the signal from the vehicle-side computer 5 is input, the control unit 35 determines that it is the signal of the K Line from the input of the pin 7 to the communication unit 34, and changes the level of the K Line signal to the chassis ground of the 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 to the input of the signal measured by the timer unit 37, Judged as a response output signal. In order to more reliably confirm that the received signal is a response output signal from the vehicle-side computer 5, the source address or the like included in the header of each received K Line signal may be analyzed. When it is confirmed that the vehicle-side computer 5 is awake, 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 Pin 16 to the car accessory 20. .

Most vehicles 1 are provided with an OBD in-vehicle connector 6 as shown in FIG. Normally, it is not easy to connect to the in-vehicle communication network 7 and to connect to a power source other than a cigarette lighter (accessory socket). and the OBD in-vehicle connector 6 for self-failure diagnosis including the supply terminal for the power supply, so that the user can connect and disconnect the power supply by himself/herself without knowledge of the in-vehicle wiring. can be performed, and can be installed without the need to go to a repair shop or the like.

Also, general car accessories are connected to the cigarette lighter (accessory socket) or the power line of the vehicle 1 . In order to prevent the car accessory from draining the battery of the parked vehicle, for example, it is necessary to provide the noise detector 33 and the relay switch 36 inside the car accessory. On the other hand, in this embodiment, as shown in FIG. 33 , a control unit 35 , a relay switch 36 and a timer unit 37 . This eliminates the need to provide the noise detector 33 or the like in the car accessory 20 which receives power supply from the power supply control device 30, and the car accessory 20 can be miniaturized. It is possible to eliminate malfunctions caused by the mixture of

In this way, the ON/OFF control of the power supply voltage supplied to the car accessory 20 is not determined based on noise alone as in the conventional art, and the signal output from the vehicle-side computer 5 to the in-vehicle communication network 7 when noise cannot be detected is also used. As a result, it is possible to determine whether the vehicle 1 is running on the battery 4 or during an idling stop, which could not be done conventionally. 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 for stopping the engine during driving is used, and the engine 2 The noise detection unit 33 can accurately detect not only the restart of the vehicle 1 but also the start of the vehicle 1 by battery running.

<Second embodiment>
For example, if the vehicle 1 has a security function such as an immobilizer, the security function of the vehicle 1 needs to be canceled before the vehicle 1 is started in order to generate noise including a voltage drop at the start of the vehicle 1 . Otherwise, the security function of the vehicle 1 will erroneously determine that the process to be started has been stolen.

The control unit 35 of the second embodiment does not output from the vehicle computer 5 when, for example, the security function of the vehicle 1 is ON and the vehicle cannot start running, and the security function is OFF and the vehicle can start running. A predetermined signal output from the vehicle-side computer 5 is detected via the communication unit 34 only when the vehicle is on. 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 changes from a state in which the predetermined signal cannot be received to a state in which the predetermined signal can be received. When the noise detector 33 detects noise generated when the vehicle 1 is started, it outputs a signal to turn on the relay switch 36 . As a result, erroneous determination of the security function can be reliably prevented.

<Third Embodiment>
A 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-described CAN, K Line, and proprietary standards of each manufacturer (LIN, BEAN, etc.). Each manufacturer's own standard in-vehicle communication network 7 is either of 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 communicates with both the in-vehicle communication network 7 that outputs a spontaneous output signal from the vehicle-side computer 5 and the 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 either of the above-described in-vehicle communication networks 7 . Which one of the two in-vehicle communication networks 7 the vehicle-side computer 5 is connected to depends on the manufacturer and vehicle type.

The power supply control device 30 that supplies power to car accessories needs to be versatile because the type of vehicle it is installed in is not limited. To have versatility means to be 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 for the spontaneous output signal and the in-vehicle communication network 7 for the response output signal. In this way, in the case of the present embodiment, even with one power supply control device 30, the in-vehicle communication network 7 for a type of vehicle that uses a spontaneous output signal and a type that uses a response output signal, 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 is connected to a plurality of different in-vehicle communication networks 7 for communication as in the above-described third embodiment, the control unit 35 allows the communication unit 34 A plurality of connected different in-vehicle communication networks 7 are monitored. Then, the control unit 35 detects which of the plurality of different connected in-vehicle communication networks 7 the in-vehicle communication network 7 with which the communication unit 34 can communicate, and 7 is used to determine whether the relay switch 36 is ON/OFF.

Since the control unit 35 of the present embodiment can detect and use a communicable in-vehicle communication network 7 among a plurality of different in-vehicle communication networks 7 connected to the communication unit 34, various in-vehicle communication networks 7 can be used. Power can be supplied to the car accessory 20 with only one power supply control device 30 for each vehicle type.

<Fifth Embodiment>
When an electric vehicle EV or a hybrid vehicle (HV) runs on battery, or when a vehicle with an engine is stopped from idling, no noise is generated from the engine, so the noise detector 33 does not detect noise. Therefore, in the control unit 35 of the fifth embodiment, the output signal of the noise detection unit 33 is not used, and the relay switch 36 is turned ON when the signal from the vehicle computer 5 is received, and the signal from the vehicle computer 5 is received. 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 to be supplied to the car accessory 20 when receiving a signal from the vehicle computer 5, not when noise is detected from the power supply voltage. When the signal cannot be received, the power supply voltage supplied to the car accessory 20 is controlled to be OFF.

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 wakes up, it is considered that the vehicle is running or there is an occupant in the vehicle 1 and the ignition key is turned on, and there is a demand for car accessories. Signals from the vehicle-side computer 5 can be determined 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 awake as described above, even a hybrid car (HV) or a car having an idling stop function can 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, as a predetermined time, the period of the maximum occurrence interval of noise generated by the armature of the alternator that fluctuates according to the engine speed. 42 changes the filter to match the noise frequency of the alternator. Then, in the control unit 35, the relay switch 36 is not turned off when the next noise can be detected by the noise detection unit 33 within a predetermined time by the timer unit 37 after the previous noise is detected by the noise detection unit 33. make it

In the case of this embodiment, the relay switch 36 is not turned off while the noise detector 33 is detecting continuous noise such as alternator noise. Therefore, in the vehicle 1 having the engine 2, power can be continuously supplied to the car accessory 20 while the engine 2 is running.
<Another embodiment>
(1) The power control device 30 may be provided inside the car accessory. For example, the power 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 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 that obtained from the OBD in-vehicle connector 6, and various configurations such as a configuration in which power is obtained directly from a battery, for example, can be adopted.

1 vehicle,
2 engines,
3 alternator,
4 batteries,
5 vehicle side computer,
6 OBD (On-Board diagnostics) in-vehicle connector,
7 in-vehicle 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 device,
31 power supply input side connector,
32 power supply 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 pass circuit,
42 filters,
43 amplifier circuit,
44 rectifier circuit,
45 DC conversion circuit.

Claims (3)

A power control device,
a connection means connectable to the in-vehicle connector;
A timer function that measures time,
a function of sending a response request signal to a vehicle-side computer connected to an in-vehicle communication network via the in-vehicle connector to which the connection means is connected;
Based on the function of the timer, when a response output signal to the response request signal is detected within a predetermined time after the response request signal is sent, the electric power supplied from the vehicle is supplied to the car accessory. and the ability to control the start of
has
The power supply control device, wherein the predetermined time is determined according to a standard or regulation for each type of an in-vehicle communication network connected to the in-vehicle connector. 2. The power control device according to claim 1, wherein the control function to be started uses the predetermined time according to the type of the in-vehicle communication network based on the pin arrangement of the in-vehicle connector. The function of performing control to start performs control to start supplying electric power supplied from the vehicle side to the car accessory side using information from an in-vehicle communication network capable of communicating via the connection means. Item 3. The power supply control device according to Item 1 or 2.

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