JP2003154905A - Power supply control unit for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electric power consumption in an on-vehicle electronic device when a key is only in an accessory state, and eliminate possibility of failure of the on-vehicle electronic device during operation by a sudden cut-off of power-supply voltage due to an engine stoppage. SOLUTION: The unit is provided with a vibration detecting means 7, an engine noise detecting means 8, a power supply control circuit 14 which controls power supply to an on-vehicle electronic device body 2 and a hard disc driver 3 from a battery power 1. The power supply control circuit 14 starts supplying the power-supply voltage to the on-vehicle electronic device when confirming the operation of the engine by receiving a vibration detection signal and/or a noise detection signal after the key position is in the accessory state. The unit continues to supply the power-supply voltage to the on-vehicle electronic device until the state that does not receive a write/read operation signal when receiving a write/read signal from the main body 2 of the on-vehicle electronic device even if the engine stops.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for an automobile, and more particularly to a power supply control device for a vehicle, which is operated when power is consumed in an on-vehicle electronic device or an engine is stopped even though a key position is merely an accessory state. The present invention relates to a new vehicle power supply control device that eliminates the possibility that a power supply voltage of an in-vehicle electronic device may suddenly be cut off and cause a failure.

[0002]

2. Description of the Related Art Generally, an automobile supplies a power supply voltage to each part of the automobile, and stores a generator (alternator generator) that rotates when an engine rotates and an electric power generated by the generator. It has a power supply device composed of a battery [secondary battery (generally lead-acid battery)], and the output of the power supply device is a starter motor, a lamp, etc.
It is sent as a power supply voltage to an electronic circuit or the like, and is further supplied as a power supply voltage to an on-vehicle electronic device such as a car audio device.

In a vehicle, if the key position is in the accessory state even if the engine is not operated, the power supply voltage is supplied from the battery power supply of the power supply device to the on-vehicle electronic equipment through the power supply line. Further, if the engine is stopped, the supply of the power supply voltage to the vehicle-mounted electronic device is stopped regardless of the state of the vehicle-mounted electronic device.

[0004]

By the way, in the prior art, as described above, even if the engine is not operated, if the key position is in the accessory state, the power supply voltage is supplied from the power supply device to the on-vehicle electronic equipment through the power supply line. Since it is designed to supply the battery, it is easy for the battery to go up.

That is, if the vehicle-mounted electronic device consumes electric power even if the engine does not operate, the electric power is supplied from the battery which is not charged. Therefore, when the time passes without noticing it, the remaining amount of electricity stored in the battery gradually decreases, and eventually falls below the allowable limit and the vehicle cannot run, that is, the so-called battery goes up.

[0006] Further, some vehicle-mounted electronic devices are equipped with devices, members and the like that may be destroyed if the supply of the power supply voltage is stopped during operation, such as a hard disk driver. Taking a hard disk driver as an example, it generally has the possibility of failing if the supply of power supply voltage is suddenly stopped during a write or read operation. Therefore, in the prior art, when the hard disk driver turns off the key to stop the engine during the write / read operation, the supply of the power supply voltage supplied from the power supply device through the power supply line is stopped, and the hard disk driver fails. There was a fear that.

The present invention has been made to solve the above problems, and it is an object of the present invention to prevent power consumption of an in-vehicle electronic device even though a key position is merely an accessory state. Furthermore, it is another object of the present invention to eliminate the risk that the vehicle-mounted electronic device that is operating due to the engine being turned off suddenly cuts off the power supply voltage and fails.

[0008]

According to a first aspect of the present invention, there is provided an automobile power supply control device for an engine vibration detection means or an engine sound detection means and / or an engine noise detection means for detecting engine noise, and a power supply line to an on-vehicle electronic device. A power supply control circuit for controlling the power supply of the engine, the power supply control circuit outputs the output of the engine vibration detecting means or the engine sound detecting means and / or the engine noise detecting means after the key position becomes the accessory state. When the operation of the engine is received and the operation of the engine is confirmed, the supply of the power supply voltage from the power supply line to the vehicle-mounted electronic device is started.

Therefore, according to the vehicle power supply control device of the first aspect, even if the key position is in the accessory state, the power supply control circuit allows the power supply voltage to be supplied to the vehicle-mounted electronic device unless the engine is operated. Therefore, it is possible to avoid a situation in which the so-called battery goes up due to power consumption in the vehicle-mounted electronic device even though the key position is only in the accessory state.

According to another aspect of the present invention, there is provided a vehicle power supply control device.
A power supply control circuit for controlling the power supply to the vehicle-mounted electronic device that may be damaged if the supply of the power supply voltage is stopped during the write / read operation is provided. When stopped, the writing / reading operation signal indicating that the writing / reading operation is being performed is received, and even if the engine is stopped while receiving the writing / reading operation signal from the vehicle-mounted electronic device. The supply of the power supply voltage from the power supply line to the vehicle-mounted electronic device is continued until the write / read operation signal is not received.

Therefore, according to the vehicle power supply control device of the second aspect, when the vehicle-mounted electronic device receives the write / read operation signal even when the engine is stopped, the signal is not received. Since the supply of power supply voltage is continued until
It is possible to avoid the risk that the vehicle-mounted electronic device that is in the writing / reading operation is stopped from being supplied with the power supply voltage and malfunctions because the engine is stopped.

A power supply control device for an automobile according to claim 3 is
An engine sound detection unit that detects an engine sound generated by the operation of the engine and a power supply control circuit that controls the power supply from the power line to the vehicle-mounted electronic device are provided, and the power supply control circuit has a key position in an accessory state. A power supply control device for an automobile, which starts supplying a power supply voltage from the power supply line to the vehicle-mounted electronic device when an engine sound detection signal from the engine sound detection means is received after The engine sound detecting means includes a sound collector, a recording unit that records the vehicle engine sound collected by the sound collector, a sound collected by the sound collector, and an engine stored in the recording unit. The sound is compared, and the engine is operating when the sound currently being collected is within the preset range of identity with the car engine sound recorded (registered) in the recording unit. The engine sound detection signal indicating characterized by comprising been to deliver to the power supply control circuit.

Therefore, according to the vehicle power supply control apparatus of the third aspect, the engine sound detecting means can detect only the sound of the engine of the vehicle equipped with the vehicle power supply control apparatus. It is possible to eliminate the possibility that the engine sound is detected and the power supply control circuit is operated based on it to cause a malfunction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the first embodiment of the present invention, engine vibration detection means or engine sound detection means and / or
Alternatively, an engine noise detection means and a power supply control circuit for controlling the power supply from the power supply line to the in-vehicle electronic device are provided, and the power supply control circuit is configured to generate engine vibration or engine noise after the key position becomes the accessory state. When the operation of the engine is confirmed by receiving the output of the detection means and / or the engine noise detection means, the supply of the power supply voltage from the power supply line to the vehicle-mounted electronic device is started. / Or from the detection result of the engine vibration and the detection result of the engine noise of the power supply line, it is determined whether the engine has operated according to a preset rule, and based on that, the power supply voltage from the battery power supply to the in-vehicle electronic device is supplied. It is supposed to be controlled.

In this case, it may be determined that the engine has moved when any one of the engine sound, vibration, and engine noise is detected, or either engine sound or vibration is detected and the engine noise is detected. It may be determined that the engine has moved when is detected, or it may be determined that the engine has been operated when all of the engine sound, vibration, and noise are detected, etc.
Various embodiments can be adopted.

The engine sound detecting means includes a sound collector (microphone) and a recording section (memory such as a flash) for recording (registering) the vehicle engine sound collected by the sound collector.
And the sound collected by the sound collector and the engine sound stored in the recording circuit are compared, and the sound currently being collected is preset for the automobile engine sound recorded (registered) in the recording unit. Further, it is preferable to use a unit that includes a determination unit that determines that the engine is operating when it is within the range of identity and transmits an engine sound detection signal indicating that to the power supply control circuit. This is because it records (registers) the engine sound of a vehicle equipped with an on-vehicle electronic device, compares it with the collected sound, and determines whether the collected sound is the engine sound of the vehicle equipped with the on-vehicle electronic device. This is because it can be judged. Therefore, there is a possibility that the engine sound of the engine of another vehicle is detected and the power supply control circuit is operated based on the engine sound to cause a malfunction.
It can be lost.

The second embodiment of the present invention provides a power supply control circuit for controlling the power supply to an on-vehicle electronic device which may be damaged if the supply of the power supply voltage is stopped during the write / read operation. The power supply control circuit is adapted to receive a write / read operation signal indicating that a write / read operation is being performed, and the engine is operated when the write / read operation signal is received from the vehicle-mounted electronic device. Even if is stopped, the supply of the power supply voltage from the power supply line to the in-vehicle electronic device is continued until the write / read operation signal is not received. A hard disk driver is a typical example of an in-vehicle electronic device that may be damaged if the supply of power supply voltage is stopped during operation.

The hard disk driver may fail if the supply of the power supply voltage is stopped during the writing or reading operation, so that the supply of the power supply voltage is not stopped during the writing and the reading. It is preferable.
Note that the on-vehicle electronic device is not necessarily limited to one having a hard disk driver, and controls the power supply to the on-vehicle electronic device that may be broken if the supply of the power supply voltage is stopped during the write / read operation. In this case, the second embodiment of the present invention is effective. It should be noted that both the first embodiment and the second embodiment of the present invention can be realized in one automobile power supply control device.

[0019]

The present invention will be described in detail below with reference to the illustrated embodiments. 1 (A) to 1 (C) show a first embodiment of an automobile power supply control device of the present invention, (A) is a circuit block diagram showing the outline of the configuration, and (B) is an ACC (accessory). FIG. 6C is a flowchart showing an operation when the power is turned on, and FIG. 7C is a flowchart showing an operation when the operation of the engine is stopped.

In the drawings, reference numeral 1 denotes a battery power source of an automobile, which is charged by electric power generated by an alternator generator (not shown) which is rotated by the rotation of an engine (not shown) to generate electric power. Reference numeral 2 denotes a main body of an in-vehicle electronic device, for example, a car audio device or a car navigation device, and 3 denotes a hard disk driver of the in-vehicle electronic device 2, which fails when the supply of the power supply voltage is stopped during the writing / reading operation. It is a device with the potential.

Reference numeral 4 denotes an ACC power source which generates a voltage when the key of the automobile is inserted into a key cylinder and is in an ACC (accessory) position state. Reference numeral 5 denotes a vibration sensor which operates by receiving the voltage of the ACC power source 4 as a power source voltage. If so, an engine vibration detection signal is generated. Reference numeral 6 denotes an engine vibration detection circuit which processes an engine vibration detection signal generated from the vibration sensor 5 and detects whether or not vibration of the engine of the automobile occurs. The vibration sensor 5 and the engine vibration detection circuit 6 serve as an engine vibration detection circuit. The vibration detecting means 7 is configured.

A sound sensor may be provided instead of the vibration sensor 5, and an engine sound detection circuit may be provided instead of the engine vibration detection circuit. In this case, the sound sensor and the engine sound detecting circuit constitute an engine sound detecting means. Also, a vibration sensor 5 and a sound sensor are provided,
Further, the output signal of the vibration sensor 5 and the output signal of the sound sensor are received, the two output signals are processed, and the engine operation detection circuit determines whether or not the engine is operating, and outputs the engine operation detection signal. You may do it. In this case, when any one of the vibration and the sound of the engine is detected, the engine operation detection signal is output as if the engine is operating, and the engine is detected when both the vibration and the sound of the engine are detected. There may be an embodiment that outputs a motion detection signal.

Reference numeral 8 is an engine engine noise detecting means for detecting an engine noise component in the output power supply voltage of the battery power supply 1, which is composed of the following circuits 9 to 13. A DC cut circuit 9 removes a DC component from the output power supply voltage of the battery power supply 1. Reference numeral 10 denotes a bandpass filter that allows only a component in a predetermined band to pass from the output of the DC cut circuit 9, and has a characteristic of allowing a component in a frequency band of engine noise generated by the operation of the engine, for example, a component of 800 Hz to 8 KHz to pass. ing. Therefore, from this, unnecessary noise components with a frequency higher than that band that occurs when turning on / off the power of the air conditioner, headlights and horn in the car are cut,
It is possible to remove unnecessary noise components having a frequency lower than that band.

Reference numeral 11 is an amplifier circuit for amplifying the output of the bandpass filter 10, 12 is a rectifier circuit for rectifying the output of the amplifier circuit 11, and 13 is a reference for comparing the output of the rectifier circuit 12 with a predetermined reference value. It is a DC conversion circuit that outputs an engine noise detection signal indicating that when the value exceeds the value. By this engine engine noise detection means 8,
When the output power supply voltage of the battery power supply 1 contains noise due to the operation of the engine, the engine noise can be detected and an engine noise detection signal can be output.

Reference numeral 14 denotes a power supply control circuit which is interposed between the battery power source 1 and the on-vehicle electronic device (for example, a car navigation device) 2 and is connected from the battery power source 1 to the on-vehicle electronic device main body 2 through a power line. It controls the supply of the power supply voltage of the CPU, the CPU (Central Processing Unit), the RO
M (read only memory), RAM (random access memory), etc. are provided, and power supply control is performed according to a predetermined program.

An outline of the power supply control by the power supply control circuit 14 is as follows: the engine vibration detection signal output from the engine vibration detection circuit 6 and the engine noise detection signal output from the engine engine noise detection means 8 are received. Further, it receives a write / read operation signal from the vehicle-mounted electronic device 2 and permits or prohibits supply of a power supply voltage from the battery power source 1 to the vehicle-mounted electronic device 2 based on the received signals. . There is an embodiment in which the engine is started when the power supply control circuit 14 receives both the engine vibration detection signal from the engine vibration detection means 7 and the engine noise detection signal from the engine engine noise detection means 8. There is also an embodiment in which it is determined that the engine has started when receiving one of the detection signals.

The operation of the power supply control device shown in FIG. 1A will be described below. First, the operation when the key is inserted into the key cylinder and the accessory (ACC) state is set will be described with reference to the flowchart shown in FIG. (1) "ACC power on" The driver inserts the key into the key cylinder, and
When the accessory (ACC) state is set, the ACC power supply 4 is turned on, and the power supply voltage is generated from the ACC power supply 4.

(2) "Power Supply to Vibration Sensor" When the ACC power supply 4 is turned on and a power supply voltage is generated, the vibration sensor 5 receiving the power supply voltage starts operating. That is, the engine vibration detection operation is started. (3) "Engine start" When the user (driver) turns the key to start the engine, the engine starts.

(4) "Vibration detection" When the engine is started, the vibration, that is, the engine vibration is generated, and at the same time, the output voltage of the battery power source 1 is accompanied by alternator noise (engine noise). Then, the engine vibration detection means 9 sends an engine vibration detection signal to the power supply control circuit 14, and the engine noise detection means 8 sends an engine noise detection signal to the power supply control circuit 14.

(5) "Power-on of vehicle-mounted electronic device" When the power supply control circuit 14 receives one of the engine vibration detection signal and the engine noise detection signal (or both), the power supply from the battery power source 1 to the vehicle-mounted electronic device 2 Allow voltage supply. As a result, the vehicle-mounted electronic device 2 can operate by receiving the supply of the power supply voltage.

Since the operation as shown in FIG. 1 (A) is performed in this way, even if the key position is in the accessory state, the power supply control circuit 14 does not operate unless the engine operates.
Does not allow the supply of the power supply voltage to the vehicle-mounted electronic device 2. Therefore, it is possible to effectively and surely prevent the situation in which the so-called battery power source 1 goes up due to power consumption in the vehicle-mounted electronic device 2 even though the key position is only in the accessory state.

Next, the operation when the engine is stopped will be described with reference to the flow chart shown in FIG. (6) "Engine off" When the vehicle is stopped running and the key inserted in the key cylinder is turned to the engine stop position, the engine stops. (7) “Vibration Sensor Off / Engine Noise Detection Off” When the engine is stopped, the engine naturally eliminates vibration and engine noise disappears. Therefore, the engine vibration detection signal and the engine noise detection signal received by the power supply control circuit 14 also disappear.

(8) "In-vehicle electronic device data writing?" The in-vehicle electronic device has the hard disk driver 3, and the hard disk driver 3 fails when the supply of the electric voltage is stopped at least during the writing / reading operation. there's a possibility that. For this reason, when the vehicle-mounted electronic device main body 2 is performing the writing or reading operation with respect to the hard disk driver 3, the power supply control circuit 14 outputs a writing / reading operation signal indicating that the writing / reading operation is being performed. I am trying to output to.
When the power supply control circuit 14 becomes in a state of not receiving the engine vibration detection signal and / or the engine noise detection signal, the power supply control circuit 14 determines whether or not the write / read operation signal is output from the in-vehicle electronic device main body 2.

On the other hand, the power supply control circuit 14 writes / writes
When the read operation signal is not received, the power supply control is performed so that the supply of the power supply voltage from the battery power supply 1 to the vehicle-mounted electronic device 2 is stopped immediately after the engine stops, but the write / read operation signal is received. At this time, the power supply control is performed so that the supply of the power supply voltage from the battery power supply 1 to the vehicle-mounted electronic device 2 is continued even if the engine is stopped. This is to prevent the hard disk driver 3 from failing due to the supply of the power supply voltage being stopped during the write / read operation. This step (8) is a step of determining whether or not the supply of the power supply voltage can be stopped.

(9) "Writing of in-vehicle electronic device data" When the determination result of the above step (8) is Yes, that is,
When the write / read operation signal is issued during the write or read operation, the writing of the data is continued until it is completed. That is, the supply of the power supply voltage from the battery power supply 1 to the vehicle-mounted electronic device 2 is continued. (10) "Power supply to vehicle-mounted electronic device is turned off" When the determination result of step (8) is No, that is, the hard disk driver 3 is not performing the writing operation or the reading operation, and the power supply control from the vehicle-mounted electronic device main body 2 is performed. Circuit 14
When the write / read operation signal is not output to, the supply of the power supply voltage from the battery power supply 1 to the vehicle-mounted electronic device 2 is stopped.

When the operation of step (9), that is, the writing or reading operation is completed, the determination result of step (8) is No. Then, as a result, step (1
Due to 0), the supply of the power supply voltage is stopped. In this way, when the engine is stopped, as shown in FIG.
Therefore, even if the engine is stopped, when the power supply control circuit 14 receives the write / read operation signal from the main body 2 (that is, during the write or read operation), the power supply voltage is Since the supply of the power supply voltage is continued without stopping the supply of the power supply, it is possible to surely avoid the risk that the on-vehicle electronic device during the writing or reading operation is stopped by the supply of the power supply voltage and fails due to the stop of the engine. can do.

The embodiment shown in FIG. 1 has an engine noise detecting means 8 and an engine vibration detecting means 7. However, in the vehicle power supply control device of the present invention, the engine vibration detecting means 7 is replaced by an engine sound detecting means. You may use it. Alternatively, the engine noise detecting means 8 may not be used, and only the engine sound detecting means may detect whether or not the engine is operating (the engine is running).

FIGS. 2A to 2C are for explaining an example of such an engine sound detecting means. FIG. 2A is a circuit block diagram showing a schematic structure thereof, and FIG. 2B is an automobile engine. Flowchart showing operation of recording sound, (C)
3 is a flow chart showing an operation of detecting whether or not an engine of a vehicle is operating to generate an engine sound. Two
Reference numeral 0 denotes a microphone for detecting engine sound, which is provided at a position suitable for collecting engine sound. Reference numeral 21 is a voice interface that processes the output signal of the microphone 20 and converts each characteristic of the collected voice into a digital signal, and 22 is a CPU, which controls the entire engine sound detecting means.

Reference numeral 23 is a ROM for recording the programs executed by the CPU 22, 24 is a RAM for temporarily storing the data necessary for the CPU 22 to execute the programs recorded in the ROM 23, and 25 is the sound of the engine of the automobile. The memory for storing engine sound is composed of, for example, a flash memory and has non-volatility. Reference numeral 26 is a writing / reading control circuit for controlling writing / reading of a voice characteristic signal to / from the engine sound storage memory 23. An input circuit 27 processes an input signal output from the input operation unit when a user (driver) operates an input operation unit including switches such as keys.

Next, the operation of recording (registering) the sound generated when the engine of the automobile operates, that is, the engine sound will be described with reference to FIG. (11) "Recording instruction" When recording the engine sound of a car, the recording instruction is given to the effect that the recording is instructed. Then, when the operation is performed, the operation shown in FIG.

(12) "Sound detection?" When recording (registering) engine sound, the engine must be operated as a matter of course. Therefore, this step is to confirm that the engine is operating by detecting the engine sound. This detection is repeated until a determination result of Yes is obtained.
It should be noted that even if a sound with a volume significantly lower than the engine sound of the automobile is input, a signal indicating that the sound is detected is not emitted. This is to prevent a sound other than the engine sound from being recorded (registered) as the engine sound.

(13) "Sound input" When the determination result of the step (12) is Yes, a digital sound signal obtained by processing the signal indicating the sound picked up by the microphone 20 by the sound interface is input. (14) "Recording" When a sound signal is input, the sound signal is recorded in the engine sound recording memory 25 by the operation of the write / read control circuit 26.

(15) "t <T?" It is detected whether or not the elapsed time t from the start of input exceeds the preset sound collection set time T. The engine sound needs to be detected for a certain time T, but it is not necessary to detect it for a longer time. Therefore, this step is to determine whether or not the elapsed time t from the start of sound collection exceeds the sound collection set time T. If the determination result is No, the process returns to step (13). If the result of this determination is Yes, it means that the recording of the necessary engine sound has ended, so the flow of this operation ends, that is, (1
6) Reach the "end".

With such a flow, the engine sound of the automobile can be recorded (registered). Then, the recorded engine sound becomes a comparison reference when the engine sound is detected later. Next, the operation of detecting the engine sound will be described with reference to FIG. (17) “Sound detection” The operation according to this flow is performed when the microphone 20 detects a sound.

(18) "Sound input" When a sound is detected, the sound is input. (19) “Record” Record the input sound (register). This recording is done to compare the current sound with the already recorded (registered) engine sound.

(20) "t <T?" It is detected whether or not the elapsed time t from the start of the input exceeds the preset sound collection set time T. The engine sound needs to be detected for a certain time T, but it is not necessary to detect it for a longer time. Therefore, this step is to determine whether or not the elapsed time t from the start of sound collection exceeds the sound collection set time T. The gist is the same as in step (15) described above. If the determination result is No, step (1
Return to 8).

(21) "Comparison" When the determination result of step (20) is Yes, the engine sound recorded (registered) in the engine sound storage memory 25 is compared with the sound just input and captured. It is determined whether or not a preset matching condition is satisfied. If the determination result is No, it can be said that the sound currently picked up by the microphone 20 is not the engine sound of the present power supply control device, and the process returns to step (18).

(22) "Engine sound detection signal output" When the determination result of step (21) is Yes, the sound currently picked up by the microphone 20 is the engine sound of the vehicle equipped with the vehicle power supply control device. Because I can say
An engine sound detection signal indicating that the engine sound has been detected is output. According to the power supply control device for an automobile, the engine sound of the automobile is recorded (registered), and the collected sound is compared with whether the collected sound is the engine sound of the vehicle equipped with the in-vehicle electronic device. It can be determined whether or not. Therefore, it is possible to eliminate the risk that an engine sound or the like of the engine of another vehicle is detected and the power supply control circuit is operated based on the detected engine sound to cause a malfunction.

The engine sound detecting means shown in FIG. 2 can be used in place of the engine vibration detecting means of the power supply control device shown in FIG.
The OM 23, the RAM 24 and the like may be those inside the power supply control circuit 14.

[0050]

According to the power supply control device for an automobile of the first aspect, even if the key position is in the accessory state, the power supply control circuit allows the power supply voltage to be supplied to the on-vehicle electronic device as long as the engine does not operate. Therefore, it is possible to avoid a situation in which the so-called battery goes up due to power consumption in the vehicle-mounted electronic device even though the key position is only in the accessory state.

According to the power supply control device for a vehicle of the second aspect, even if the engine is stopped, the on-vehicle electronic device receives the write / read operation signal indicating that the on-vehicle electronic device is performing the write or read operation. In this case, since the supply of the source voltage is continued until the signal is not received, there is a fear that the on-vehicle electronic device during the writing or reading operation is stopped due to the stop of the engine and the supply of the power supply voltage is stopped to cause a failure. Can be avoided.

According to the vehicle power supply control device of the third aspect, the engine sound detecting means can detect only the engine sound of the engine of the car equipped with the power supply control device. It is possible to surely prevent the risk of the detection and causing the power supply control circuit to operate based on the detection.

[Brief description of drawings]

1A to 1C show a first embodiment of a power supply control device for an automobile of the present invention, FIG. 1A is a circuit block diagram showing a schematic configuration, and FIG. 1B is an ACC power supply. Is a flowchart showing the operation when the engine is turned on, and (C) is a flowchart showing the operation when the engine is stopped.

2A to 2C are for explaining an example of such engine sound detecting means, FIG. 2A is a circuit block diagram showing a schematic configuration thereof, and FIG. (C) is a flowchart showing the operation of detecting whether or not the engine of the automobile is operating to generate an engine sound.

[Explanation of symbols]

1 ... Battery power source, 2 ... In-vehicle electronic device main body,
3 ... A part that may be damaged if the supply of power supply voltage is stopped during operation (hard disk driver), 4.
..Accessory (ACC) power supply, 5 ... Vibration (sound) sensor, 6 ... Engine vibration (sound) detection circuit, 7 ...
Engine vibration (sound) detection means, 8 ... Engine noise detection means, 14 ... Power supply control circuit, 20 ... Sound pickup section (microphone), 25 ... Engine sound storage memory, 26 ... Write / read control circuit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Nagashima             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 3G084 BA00 DA00 DA02 FA00 FA03                       FA36

Claims (3)

[Claims] 1. An engine vibration or engine sound detecting means for detecting vibration or voice generated by the operation of the engine and / or an engine noise detecting means for detecting noise carried when the engine operates on the power supply line, and the power supply line A power supply control circuit for controlling the power supply to the in-vehicle electronic device; and the power supply control circuit, after the key position is in the accessory state, detects vibration or engine sound detection means and / or engine noise detection means. When the operation of the engine is confirmed by receiving the output of the above, the supply of the power supply voltage from the power supply line to the vehicle-mounted electronic device is started. 2. A power supply control circuit for controlling power supply to an in-vehicle electronic device, which may be damaged if supply of a power supply voltage is stopped during a write / read operation, the power supply control circuit comprising: Write from the in-vehicle electronic device
A write / read operation signal indicating that a read operation is being performed, and even if the engine is stopped while receiving the write / read operation signal from the on-vehicle electronic device, the power supply voltage from the power supply line The power supply control device for an automobile, characterized in that the power supply to the vehicle-mounted electronic device is continued until there is no possibility of failure. 3. An engine sound detecting means for detecting a sound generated by the operation of the engine, and a power supply control circuit for controlling power supply from a power supply line to an in-vehicle electronic device, the power supply control circuit comprising: After the key position becomes the accessory state, when the engine sound detection signal of the engine sound detection means is received, the supply of the power supply voltage from the power supply line to the in-vehicle electronic device is started. In the power supply control device, the engine sound detecting means includes a sound collector, a recording unit that records an automobile engine sound collected by the sound collector, and a sound collected by the sound collector. The engine sounds stored in the recording unit are compared, and when the sound currently being collected is within a preset range of identity with the vehicle engine sound recorded in the recording unit, the engine is activated. Automobile power supply control device for an engine sound detection signal indicating that it is characterized by comprising been to transmit to the power supply control circuit.