JP4813161B2 - Power management system - Google Patents

Description

  The present invention relates to a power management system, and more particularly to a system that automatically shuts off power even when a room lamp or an electrical load is forgotten to be turned off.

The electronic control unit is controlled by a microcomputer as performance increases. When the load is in the sleep state, the microcomputer is also stopped at the same time to reduce battery power consumption. Japanese Patent Application Laid-Open No. 11-115650 proposes a system for appropriately monitoring the operation of a control unit including a microcomputer as necessary when an ignition switch is off and in a sleep state.
However, this system can control a load having an electrical control unit even when the ignition key is off, but has an electrical control unit such as a room light or a fog light. It cannot function for loads that do not. Also, no consideration is given from the viewpoint of forgetting to cut the light.

JP 11-115650 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a system that automatically shuts off the power when a room lamp or load is forgotten to be turned off even when the ignition key is off.

The present invention is a circuit cutting means for interposing between a battery mounted on a vehicle and a load (electric load) and stopping power supply to the load;
Load monitoring means for monitoring the operating state of the load;
Alighting detection means for detecting that at least the ignition key is in the off position and the door closed state is a state where the passenger has got off the vehicle,
Control means for interrupting power supply to the load by the circuit disconnecting means when the getting-off detecting means detects the getting-off state and the load monitoring means detects the operating state of the load;
A warning sound generating means for generating a warning sound forgetting to cut connected to the control means;
The control means generates a warning sound from the warning sound generating means before interrupting the power supply to the load by the circuit disconnecting means, and monitors the state after the warning sound is generated by the getting-off detection means. Provides a power management system that reconfirms the absence of

  First, it is determined by the load monitoring means that the electrical load is in an operating state. If it is in the operating state, then it is determined by the getting-off detection means whether the ignition key is in the OFF position and the door is in the closed state. If the ignition key is off and the door is closed, the getting-off detection means determines that the occupant is getting off and sends a signal to the control means. Upon receiving the signal, the control means disconnects the circuit by the circuit disconnecting means, and interrupts the power supply to the load. Further, the power supply may not be interrupted immediately after detecting the getting-off state, but the power supply may be interrupted after measuring a certain time by the time measuring means.

By performing such an operation, when the occupant gets out of the vehicle, power supply to the load can be automatically interrupted, and forgetting to switch off the load is prevented. In particular, even in the case of a load that is turned on and off by a manual switch or the like that does not have an electrical control unit, the power supply can be interrupted by using the power management system.
Furthermore, when power supply to the load is interrupted, the indoor switch becomes invalid, so that erroneous determination can be prevented and vehicle theft can be prevented.

  It is preferable that the control means outputs a control signal for suspending the load via the in-vehicle LAN network before interrupting the power supply to the load by the circuit disconnecting means.

  If the load is stopped by outputting a control signal from the control means before the power supply is interrupted by using the circuit disconnecting means, the load is interrupted rather than by the interruption of the power supply by using the circuit disconnecting means. Generation | occurrence | production of a surge current etc. can be suppressed and the burden concerning a load or a circuit can be reduced.

  The getting-off detection means includes at least an ignition key insertion / removal detection means, a means for detecting a closing operation after a predetermined time after the door opening operation, an infrared sensor for detecting a passenger in the automobile, a pressure sensor for detecting a passenger in the seat, and a door It is also possible to add one of the lock detection means and the ignition key communication detection means having a wireless communication function to detect the getting-off state. Moreover, you may detect a passenger's getting off using all these.

  Since the ignition key is pulled out when the occupant does not use the automobile, the occupant can be detected by the insertion / removal detection means of the ignition key. Further, when the occupant gets off the automobile, the door is closed after a certain time after opening the door, so that the occupant can be detected by means for detecting the closing operation after a predetermined time after the door opening operation. By using the infrared sensor and the pressure sensor, it is possible to detect the passenger getting off more accurately. Since the locking is performed when the occupant leaves the automobile, the occupant can be detected using the door locking detection means. When the occupant leaves the vehicle with the ignition key, the immobilizer and the ignition key cannot communicate with each other, so the occupant can be detected by the communication detection means.

A warning sound generating means for generating a warning sound of forgetting to cut is connected to the control means;
The control means generates a warning sound from the warning generating means before interrupting the power supply to the load by the circuit disconnecting means, and monitors the state after the warning sound is generated by the getting-off detection means. It is preferable to reconfirm absence.

  With the above configuration, the information on the passenger getting off from the getting-off detection means is input to the control means and a warning sound is generated, so that the passenger can be warned of forgetting to turn off the load. In addition, the absence of an occupant can be reconfirmed by monitoring the state after the warning sound is generated after the warning sound, and if the occupant is present in the vehicle, the occupant operates by the warning sound, so the occupant is detected. It can be carried out.

  When the occupant gets out of the vehicle, the power supply to the load can be automatically interrupted, thereby preventing the load switch from being forgotten. In particular, even in the case of a load that does not have an electrical control unit, the power supply can be interrupted by using the power management system.

  If the control circuit is to suspend the load by outputting a control signal from the control means before interrupting the power supply using the circuit disconnecting means, in the case of a load having an electrical control unit, the circuit disconnection The generation of a surge current or the like can be suppressed and the burden on the load or circuit can be reduced as compared with the suspension of the load due to the interruption of the power supply using the means.

  Further, the getting-off detection means includes an ignition key insertion / removal detection means, a means for detecting a closing operation after a predetermined time after the door opening operation, an infrared sensor for detecting a passenger in the automobile, a pressure sensor for detecting a passenger in the seat, a door By detecting at least one of the lock detection means and the communication detection means of the ignition key having a wireless communication function to detect the getting-off state, more accurate occupant detection can be performed.

  Furthermore, the information on the passenger getting off from the getting-off detection means is input to the control means and a warning sound is generated, so that the passenger can be warned of forgetting to switch off the load. In addition, the absence of an occupant can be reconfirmed by monitoring the state after the warning sound is generated after the warning sound, and if the occupant is present in the vehicle, the occupant operates by the warning sound, so the occupant is detected. It can be carried out.

FIG. 1 shows a power management system 10 according to a first embodiment of the present invention.
In the power management system 10, the battery 11 is connected to the power management unit 12 via the wire W 1, and the room lamp 41, the headlight 42, the fog light 43, and other loads 41, 42, which are electric loads, are connected via the wire W 2. Is connected. Also, other loads 45 and 46 are connected by the in-vehicle LAN network W3. Each of the loads 41 to 43 includes manual switches Sw1 to Sw3 that can be switched on and off by a manual operation by a user.

  Further, the power management unit 12 of the present embodiment shows an example in which the accessory power source is used as means for detecting whether the ignition key is in the off position by connecting the signal line 13 to the accessory power source. Similarly, by connecting the signal line 14 to the cylinder of the ignition key and using the ignition key as a means for detecting insertion and removal, and connecting the signal line 15 to the power line of the courtesy light, the power line of the courtesy light is opened after the door is opened. It is used as means for detecting a closing operation after a predetermined time. Further, the signal lines 16 to 18 are respectively connected to an infrared sensor Sa for detecting an occupant in the automobile, a pressure sensor Sb for detecting an occupant in a seat, and an immobilizer Sc constituting an ignition key communication detecting means having a wireless communication function. ing. The infrared sensor Sa can be a pyroelectric sensor, and the pressure sensor Sb can also be used as a load sensor used in an airbag control ECU provided under the seat. Further, the signal line 19 is connected to an output of a signal to a locking load (for example, a solenoid), thereby being used as a door locking detection means.

The power management unit 12 includes a self-holding type latch relay 21 that constitutes a circuit disconnecting means for stopping the power supply to the load, a current sensor 22a that constitutes a load monitoring means that monitors the operating state of the load, and an exit detection Means 23, control means 24, timer 25, buzzer 26 constituting warning sound generating means for generating forgetting to turn off warning sound, and in-vehicle LAN communication means 31 configured to be able to transmit a signal to in-vehicle LAN network W 3 In addition, a load operation monitoring unit 32 for determining a load state based on a signal from the in-vehicle LAN communication unit 31 and an interface 33 are provided.

  One of the latch relays 21 is connected to the battery 11, and the other is connected to a room lamp 41, a headlight 42, a fog light 43, and other loads 44 and 45, which are loads, via a wire W2. That is, the latch relay 21 is connected to the interface 33, and by receiving the signal S for operating the latch relay 21 from the control means 24 via the interface 33, the supply of electric power via the wire W2 can be turned on and off. The latch relay 21 of the present embodiment is a self-holding type, which can suppress power consumption other than when the relay is switched.

  The current sensor 22a measures the current flowing through the wire W2, and for example, a current probe can be used. The current sensor 22a is connected to the control means 24 via the interface 33.

The getting-off detecting means 23 basically detects the getting-off state when the occupant gets out of the car by monitoring the power switching position by the ignition key and the open / closed state of the door. Moreover, although the detection state of a passenger | crew can be twisted and detected reliably using each detection means input via each said signal wire | line 15, 17-19, this invention is limited to the structure which uses all of this. It is not a thing.

  The control means 24 uses the latch relay 21 to interrupt power supply to the load when the getting-off detecting means 23 detects the getting-off state and the load monitoring means detects the operation of the load. The timer 25 constitutes time measuring means for measuring the time until the power supply to the load is interrupted after the getting-off detecting means 23 detects the getting-off state and the current sensor 22a detects the operation of the load. The buzzer 26 is connected to the control means 24 and generates a warning sound, but it may be formed using other sound generation means such as a speaker.

  The in-vehicle LAN communication means 31 is connected to the loads 44 and 45 by the in-vehicle LAN network W3, and the load operation monitoring means 32 is connected to the control means 24. Each of the means 23 to 25, 31, 32 may be configured by a circuit having a function, but the control means 24, the getting-off detection means 23, the in-vehicle LAN network communication means 31, the timer 25, etc. are also implemented in software. It is feasible. That is, it may be formed by a program that can be executed by a calculation means (CPU).

FIG. 2 is a flowchart showing the operation of the power management unit 12, and FIG. 3 shows an operation time chart of the power management unit 12.
In step S1, it is determined by the load monitoring means 22a whether any of the room lamp 41, the headlight 42, the fog light 43, and the loads 44 and 45 are lit. If it is not lit, the process returns to the start, and if it is lit, the process proceeds to step S2.

Step S2 determines whether the ignition key is off. If the ignition key is on, the process returns to the start. If the ignition key is off, the process proceeds to step S3.
Step S3 determines whether the ignition key has been removed. If the ignition key has been removed, the process proceeds to step S4.
In step S4, it is determined whether the door closing operation is performed after a predetermined time after the door opening operation. If the door is closed after a predetermined time after the door opening operation, the process proceeds to step S5. Here, the predetermined time is the minimum time required for the occupant to get off using the door, for example, several seconds.

In step S5, the presence of an occupant is determined based on the occupant detection information. The occupant detection information can be obtained by an infrared sensor Sa for detecting an occupant in the automobile or a pressure sensor Sb provided on the seat. When the passenger is absent, the process proceeds to step S6.
In step S6, the door locking state is determined. If the door is locked, the process proceeds to step S7.

Step S7 determines the communication state of the ignition key and immobilizer Sc. If communication between the ignition key and the immobilizer Sc cannot be performed, the process proceeds to step S8.
In step S8, a warning sound is generated by the buzzer 26. Even if an occupant exists, the warning sound prevents the room lamp 41 from being forgotten to be turned off, and the occupant can detect the occupant with the pyroelectric sensor when the occupant operates to turn off the room lamp 41. If the pyroelectric sensor or the load sensor confirms the presence of an occupant, the process returns to the start of the flowchart without corresponding to forgetting to turn off the room lamp 41.

In step S9, a control signal for suspending the load via the in-vehicle LAN communication means and the in-vehicle LAN network is output to the load having the in-vehicle LAN network communication means connected to the in-vehicle LAN network.
In step S10, the timer 25 measures a certain time. This is because the latch relay 21 is made non-conductive after a certain time after the warning sound is generated.
In step S11, the latch relay 21 is turned off and the room lamp 41 is turned off.

Steps S1 to S7 are determined by the control unit 24. In steps S8 to S10, each operation is performed by a signal from the control unit 24.
The power management unit 12 starts its operation from the start when the ignition key is inserted again.

  The state of the room lamp 41, the headlight 42, and the fog light 43 is monitored using a current sensor 22a as load monitoring means. On the other hand, the load is connected to the in-vehicle LAN network W3, the load is monitored by the load operation monitoring unit 32 using a signal input from the load to the in-vehicle LAN network communication unit 31, and the load is in the sleep state or the operating state. Is judged. The monitoring of the load is not limited to the current sensor 22a, but includes a method of monitoring the state of the load via the in-vehicle LAN network W3.

  In the above embodiment, the signal input to the getting-off detection means 23 includes an ignition key insertion / removal detection means, a means for detecting a closing operation after a predetermined time after the door opening operation, an infrared sensor for detecting an occupant in the car, a seat A pressure sensor for detecting an occupant, a door locking detection means, and an ignition key communication detection means having a wireless communication function, all of which need not be input. If at least the ignition key OFF position and the door closed state are input, it can be determined from the information that the room lamp 41, the headlight 42, the fog light 43 and the load have been forgotten to be turned off. When the door is closed after the door is opened and closed and the ignition key is off, it is determined that the room lamp 41, the headlight 42, the fog light 43, and the loads 44 and 45 are forgotten to be turned off. Interrupt.

FIG. 4 shows a second embodiment of the present invention. It is the simplest embodiment of this system. A room lamp 41 is connected to the power management unit 12 via a wire W2, and a signal indicating an open / closed state of the door is connected via a signal line 14.
The latch relay 21 is connected to the room lamp 41 via an ON terminal 27a of a lever type changeover switch. The voltage between the room lamp 41 and the latch relay 21 is monitored by the voltage sensor 22 b, and the signal from the voltage sensor 22 b is input to the control means 24. A signal indicating the open / closed state of the door is input to the getting-off detection means 23 via the signal line 14. Information indicating the open / closed state of the door is also input to the AUTO terminal 27 b of the lever type changeover switch 27 through the relay circuit 28.

  Also in the case of the second embodiment, it is determined by the load monitoring means whether the room lamp 41 is lit, and if it is lit, the open / closed state of the door is determined. When all the doors are closed, a warning sound is generated, and the latch relay 21 is turned off after a predetermined time measured by the timer 25 has elapsed.

  When the lever type changeover switch is at the AUTO terminal 27b or the OFF terminal 27c, the power management unit 12 does not operate. When it is at the AUTO terminal 27b, the room lamp 41 is automatically turned off by the relay circuit 28 based on the open / closed state of the door. When it is at the OFF terminal 27c, the room lamp 41 is turned off. Because.

With the above configuration,
When the occupant gets out of the vehicle, the power supply to the load can be automatically interrupted, thereby preventing the load switch from being forgotten. In particular, even in the case of the room lamp 41, the headlight 42, the fog light 43, and the like, which are loads that do not have an electrical control unit, the power supply can be interrupted by using the power management system.

  In the case of the loads 44 and 45 connected to the in-vehicle LAN network, if the load is stopped by outputting a control signal from the control means 24 before interrupting the power supply, the power supply using the latch relay 21 can be stopped. It is possible to suppress the generation of a surge current and the like compared to the suspension of the load due to the interruption, and to reduce the load on the load and the circuit.

  Further, the getting-off detection means 23 includes at least an ignition key insertion / removal detection means, a means for detecting a closing operation after a predetermined time after the door opening operation, an infrared sensor for detecting a passenger in the automobile, and a pressure sensor for detecting a passenger in the seat By adding any one of the door lock detection means and the ignition key communication detection means having a wireless communication function to detect the getting-off state, more accurate occupant detection can be performed.

  Furthermore, when the information on getting off the passenger from the getting-off detection means 23 is input to the control means 24 and the buzzer 26 generates a warning sound, it is possible to warn the passenger of forgetting to turn off the load. In addition, the absence of an occupant can be reconfirmed by monitoring the state after the warning sound is generated after the warning sound, and if the occupant is present in the vehicle, the occupant operates by the warning sound, so the occupant is detected. It can be carried out.

It is a figure which shows 1st embodiment. It is a flowchart which shows operation | movement of 1st embodiment. It is a timing chart which shows operation | movement of 1st embodiment. It is a figure which shows 2nd embodiment.

Explanation of symbols

12 power management unit 21 latch relay 22a current sensor 23 getting-off detection means 24 control means 25 timer 26 buzzer 31 in-vehicle LAN network communication means 32 load operation monitoring means

Claims (3)

A circuit disconnecting means for interposing between a battery mounted on a vehicle and a load and stopping power supply to the load;
Load monitoring means for monitoring the operating state of the load;
Alighting detection means for detecting that at least the ignition key is in the off position and the door closed state is a state where the passenger has got off the vehicle,
Control means for interrupting power supply to the load by the circuit disconnecting means when the getting-off detecting means detects the getting-off state and the load monitoring means detects the operating state of the load;
A warning sound generating means for generating a warning sound forgetting to cut connected to the control means;
The control means generates a warning sound from the warning sound generating means before interrupting the power supply to the load by the circuit disconnecting means, and monitors the state after the warning sound is generated by the getting-off detection means. A power management system that reconfirms the absence .   2. The power management system according to claim 1, wherein the control unit outputs a control signal for suspending the load via an in-vehicle LAN network before interrupting power supply to the load by the circuit cutting unit. .   The getting-off detection means includes an ignition key insertion / removal detection means, a means for detecting a closing operation after a predetermined time after the door opening operation, an infrared sensor for detecting a passenger in the automobile, a pressure sensor for detecting a passenger in the seat, and a door locking The power management system according to claim 1, wherein at least one of a detection unit and a communication detection unit of an ignition key having a wireless communication function is added.

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