JP2005232854A - Door lock control device for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely unlock a door, and to maximally limit operation of a load when an automobile collides, by unlocking the door after source voltage is normally restored, even when the source voltage is temporarily reduced or instantaneously cut off by a collision of the automobile. <P>SOLUTION: The door is unlocked after predetermined time passes after its collision time, not just after the collision time of the automobile. The door can be surely unlocked after a specific time passes, by preventing overlapping of the door unlocking timing with instantaneous reduction and instantaneous cutoff of the source voltage by impact in a time base. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an automobile door lock control device.

  In the field of recent automobiles, with the spread of various systems such as centralized door locks, vehicle speed sensitive door locks, and keyless entry systems, door locking (locking) / unlocking (unlocking) is based on electrical control. It is operating.

  An automobile door lock control device for performing such an operation is originally based on a signal given from a push button type switch arranged in an operation panel, a vehicle speed detection signal, or a radio signal from a portable keyless operation card. Based on this, power supply to the door lock motor is controlled, and the machine part is operated to perform door unlocking / unlocking.

  By the way, when an occupant is left behind in a car that has caused a collision, it is necessary to rescue the occupant. However, in the event of a collision accident, even if an occupant in the vehicle is to be rescued, the rescue of the occupant is hindered when the door is locked.

  Therefore, for example, as disclosed in Patent Document 1, by detecting a special behavior such as a car collision and automatically unlocking it, it is possible to easily rescue a passenger in the car when a collision accident occurs. A technique is disclosed.

JP-A-11-141210

  However, when an automobile collides, a great impact is applied to the entire vehicle body, so the driving voltage applied to the on-board electronic unit such as a microcomputer or door lock motor temporarily decreases or is momentarily interrupted by the impact at the time of the automobile collision. May occur.

  In this case, if the drive timing of unlocking the door overlaps with a drop in the power supply voltage or an instantaneous interruption, the unlocking of the door may not be performed normally after the collision of the automobile.

  In addition, from the viewpoint of safety, when operating a load such as an airbag module that is indispensable to operate before and after the collision of an automobile, for example, the load is operated instantaneously. At that moment, a great amount of power is consumed. In this case, if other unnecessary loads are operating at the same time, the power supply voltage of the load important for safety may be reduced. Therefore, there is a request to limit the operation of the load as much as possible before and after the automobile collision. There is.

  Therefore, the problem of the present invention is that even when the power supply voltage is temporarily lowered or momentarily interrupted by a car collision, the door is unlocked by executing unlocking of the door after the power supply voltage returns to normal. It is an object of the present invention to provide an automobile door lock control device that can be reliably unlocked and can limit the operation of a load at the time of an automobile collision as much as possible.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an automobile door lock control device for controlling a door lock driving means for locking and unlocking a door in an automobile, wherein the vehicle collision is detected by a predetermined collision detection means. When the time elapse determination means for determining whether or not a predetermined time has elapsed from the collision time of the vehicle and the time elapse determination means determines that the predetermined time has elapsed from the collision time And an unlock instruction means for instructing the door lock driving means to unlock the door.

  The invention according to claim 2 is the automotive door lock control device according to claim 1, wherein when a collision of the automobile is detected by the collision detection means, the collision time of the automobile is recognized and the collision is detected. It further comprises a collision time storage means for storing the time in a predetermined nonvolatile storage means, and the time lapse determination means reads the collision time from the nonvolatile storage means, and whether a predetermined time has elapsed from the collision time. It is a judgment.

  The invention according to claim 3 is the automobile door lock control device according to claim 1 or 2, further comprising stop determination means for determining whether or not the automobile is stopped, and the unlock instruction. The means instructs the door lock driving means to unlock the door only when the stop determination means determines that the automobile is stopped.

  According to a fourth aspect of the present invention, there is provided the automotive door lock control device according to the second aspect, wherein the time when the unlock instruction means instructs the door lock drive means to unlock the door, It further comprises unlock time storage means for storing in the storage means.

  The invention according to claim 5 is the automobile door lock control device according to claim 2 or claim 4, and detects whether or not there has been a power interruption or a constant power supply voltage drop after the automobile collision time. When it is detected by the power supply state detection means and the power supply state detection means that neither the power supply cutoff nor the constant power supply voltage drop has occurred, the second time from the vehicle collision time given from the collision time storage means And further determining means for determining whether or not a predetermined time has elapsed, and only when the time elapse determining means determines that the power supply state detecting means determines that the power supply has been cut off or a certain power supply voltage drop has occurred. The collision time is read from the non-volatile storage means, it is determined whether a predetermined time has elapsed from the collision time, and the unlock instruction means is Only when it is determined by the state detection means that the power has been shut off or a certain power supply voltage drop has occurred, when the time elapse determination means determines that the first predetermined time has elapsed since the collision time, While instructing the door lock driving means to unlock the door, when the power state detection means determines that neither power interruption nor a constant power supply voltage drop has occurred, the other determination means determines from the collision time. When it is determined that the second predetermined time has elapsed, the door lock driving means is instructed to unlock the door.

  According to the first aspect of the invention, the door lock control device for an automobile unlocks the door after a predetermined time has elapsed since the collision time, not immediately after the collision time of the automobile. It is possible to prevent the timing of the unlocking and the instantaneous drop or instantaneous interruption of the power supply voltage due to an impact from overlapping on the time axis, and the door can be unlocked reliably after a certain period of time. In addition, from the viewpoint of safety, when operating a load such as an airbag module that is indispensable to operate before and after the collision of an automobile, for example, the load is operated instantaneously. At that moment, a large amount of power is consumed. At this point, the door lock driving means is not activated, but it is activated later, so that the power supply voltage of the load important for safety at the moment of the collision of the automobile. Thus, power supply can be performed in a concentrated manner, and the voltage drop can be reduced.

  According to a second aspect of the present invention, in the vehicle door lock control device, the time lapse determination means temporarily stores the collision time in the nonvolatile storage means, and then reads the collision time from the nonvolatile storage means for a predetermined time. Therefore, even if the power supply to the time lapse determination means is cut off, as long as the power supply is cut off after storing the collision time in the nonvolatile storage means, The elapsed time can be measured without hindrance. Further, by storing the collision time in the nonvolatile storage means, the information on the collision time can be used later as a record when the accident occurs.

  Since the door lock control device for an automobile of the invention according to claim 3 unlocks the door only when it is determined that the automobile is stopped, the door is unlocked while the automobile is running. It is possible to prevent the malfunction of the door lock driving means.

  The automobile door lock control device according to the invention of claim 4 stores the unlocking time of the door in the non-volatile storage means, so that the information on the time can be used later as a record when the accident occurs. It becomes possible.

  According to the fifth aspect of the invention, the vehicle door lock control device efficiently unlocks the door by determining the passage of time with other judging means when there is no power interruption or the like. On the other hand, when the power is cut off, the time elapse judging means reads the collision time from the non-volatile storage means, judges the elapse of time and unlocks it, thereby reliably measuring the time elapse and unlocking. It can be carried out.

<Configuration>
FIG. 1 is a diagram showing an automotive door lock control device according to an embodiment of the present invention. As shown in FIG. 1, the door lock control device for an automobile uses the fact that the impact sensor 1 detects a collision of the automobile and the airbag module 3 is activated based on the collision detection. The microcomputer 5 recognizes the collision of the vehicle based on the signal of the vehicle, and the microcomputer 5 locks the door after a predetermined reference time has elapsed from the collision of the vehicle based on the recognition result. The motor (door lock driving means) 7 is driven and controlled to unlock (unlock) the door.

  Specifically, the door lock control device for an automobile includes a microcomputer 5, a nonvolatile memory device 9 connected to the microcomputer 5, and a door lock motor 7 that is driven by the control of the microcomputer 5.

  The microcomputer 5 is installed as a control unit for controlling various vehicle-mounted electronic units including the door lock motor 7 and operates by receiving power from the power supply circuit 11 as described above. In addition to being connected to a nonvolatile memory (nonvolatile storage means) 9, it is connected to a clock module 15 and a GPS (Global Positioning System) receiving module 17 through an in-vehicle LAN 13 such as a multiple communication line.

  And the microcomputer 5 recognized the collision of the motor vehicle in the 1st function part (refer step S01 in FIG. 2) which recognizes the collision of a motor vehicle based on the signal from the airbag module 3, and this 1st function part. A second function unit (see step S02 in FIG. 2) for recognizing time (hereinafter referred to as “collision time”) based on time information from the clock module 15 and a collision time recognized by the second function unit. The third functional unit (see step S03 in FIG. 2) stored in the non-volatile memory 9 and a reset operation to determine whether the power of the microcomputer 5 itself has been cut off after the collision time recognized by the second functional unit A fourth function unit (power state detection means: see step S04 in FIG. 2) that is determined based on the presence or absence of the second function, and the second function when the power of the microcomputer 5 itself is not shut off by the fourth function unit Part A fifth function unit that measures the elapsed time from the recognized collision time based on the time measured in the microcomputer 5 and determines whether or not the elapsed time has reached a predetermined first reference time (for example, 10 seconds). (Other determination means: see step S05 in FIG. 2) and the elapsed time from the collision time recognized by the second functional unit when the power of the microcomputer 5 itself is cut off by the fourth functional unit Measurement is performed based on time information given from the clock module 15, and it is determined whether or not the elapsed time has reached or passed a predetermined second reference time (for example, any time value from 10 seconds to 20 seconds). The elapsed time reaches the first reference time in the sixth function unit (time elapse judging means: see step S06 in FIG. 2) and the fifth function unit, or the elapsed time in the sixth function unit. The second reference time is reached or passed At this time, the seventh function unit (stop) receives the movement information of the automobile given from the GPS receiving module 17 through the in-vehicle LAN 13 such as a multiplex communication line and determines whether or not the automobile is stopped based on the movement information. Judgment means: see step S07 in FIG. 2 and an eighth function unit (unlocking) that instructs the door lock motor 7 to unlock the door when it is determined that the automobile is stopped in the seventh function unit. Lock instruction means: see step S08 in FIG. 2) and the time when the eighth function unit instructs the door lock motor 7 to unlock the door (hereinafter referred to as “unlock time”). And a ninth function unit (unlock time storage means: see step S09 in FIG. 2). Desirably, the second reference time is set to be equal to or longer than the first reference time. This is because, when the power supply is cut off, each part such as the microcomputer 5 operates after the power supply is restored. Therefore, the time for waiting for the power supply to be restored is compared with the case where the power supply is not cut off. This is because of this.

  The first to ninth functional units of the microcomputer 5 are a part of a software program stored in advance in the nonvolatile storage device 9 or other information recording medium (hard disk or the like), or a subroutine or object program read by the software program. Each of the elements is defined by each of the above, and when the microcomputer 5 operates, the software program is read out and stored in the built-in volatile memory, and then operates according to the procedure defined by the software program. It is realized with.

  The first to third functional units acquire the collision time of the vehicle and store it in the nonvolatile memory 9 when the collision of the vehicle is detected by the airbag module 3 having the impact sensor 1. Functions as a means.

  Here, regarding the first functional part of the microcomputer 5, the impact sensor 1 connected to the airbag module 3 of the automobile detects the collision of the automobile, and is applied to the airbag module 3. By transmitting the signal from 1 to the microcomputer 5 in parallel, the microcomputer 5 recognizes the collision of the automobile at the timing when the airbag module 3 is activated. As the impact sensor 1 connected to the airbag module 3, an existing sensor such as a coil spring type, a roll spring type, a cylinder ball type, or a semiconductor type is used.

  The airbag module 3 protects the occupant by instantaneously filling the bag with gas when the impact sensor 1 detects a collision of the automobile and the ignition device of the inflator (gas generator) is activated. Things apply.

  Regarding the third functional unit and the ninth functional unit of the microcomputer 5, a general memory such as a flash ROM or EEPROM is used as the nonvolatile memory 9 for storing the collision time and the unlock time.

  Furthermore, regarding the seventh functional unit of the microcomputer 5, the GPS receiving module 17 receives GPS radio waves transmitted from GPS satellites arranged in outer space with a predetermined antenna (not shown), and obtains the position of the antenna. A device used in a general car navigation device (not shown) is also used as it is. Here, the reason for judging whether or not the vehicle is stopped based on the GPS radio wave from the GPS satellite is that the vehicle speed sensor that detects the vehicle speed by the rotation of the wheel may break down at the time of the collision of the vehicle. This is because the information from the GPS satellite is less likely to be lost than the information from the vehicle speed sensor.

<Operation>
The operation of the automobile door lock control device having the above configuration will be described. First, the impact sensor 1 connected to the airbag module 3 continuously detects whether or not a large impact of a certain level or more has been applied to the vehicle while the engine switch of the vehicle is on. When the impact sensor 1 detects a large impact of a certain level or more, based on the signal from the impact sensor 1, the ignition device of the inflator (gas generator) of the airbag module 3 is activated to enter the bag. Instantly fill with gas to protect occupants. In parallel with this, the signal from the impact sensor 1 is transmitted to the microcomputer 5 via the airbag module 3, whereby the collision of the automobile is recognized in the first functional part of the microcomputer 5 (FIG. 2). Middle step S01).

  Next, the second functional unit of the microcomputer 5 recognizes the collision time based on the time information from the clock module 15 (step S02 in FIG. 2), and the collision time recognized in this step S02 is Stored in the nonvolatile memory 9 by the third functional unit (step S03 in FIG. 2).

  Subsequently, in step S04 in FIG. 2, it is determined whether or not the power source of the microcomputer 5 has been cut off based on the presence or absence of a reset operation after the collision time recognized in step S02.

  In this step S04, when the power supply of the microcomputer 5 itself is not cut off, the process proceeds to step S05, and the elapsed time from the collision time recognized in step S02 is calculated in the microcomputer 5 by the fifth function unit of the microcomputer 5. Measure with Then, when the elapsed time reaches a predetermined first reference time (for example, 10 seconds), the process proceeds to step S07.

  On the other hand, in the above step S04, if the power of the microcomputer 5 itself is cut off, the process proceeds to step S06, and the elapsed time recognized in step S02 based on the time information given from the clock module 15 is reached. Measure time. Then, the sixth function unit of the microcomputer 5 proceeds to step S07 when the elapsed time reaches a predetermined second reference time (for example, any time value from 10 seconds to 20 seconds). However, when the power of the microcomputer 5 is cut off when the second reference time has been reached and the power of the microcomputer 5 is restored later than that, the sixth functional unit of the microcomputer 5 When the time obtained from (1) has elapsed from the second reference time, the process proceeds to step S07.

  In step S07, when the elapsed time reaches the first reference time in step S05, or when the elapsed time reaches or passes the second reference time in step S06, the seventh functional unit of the microcomputer 5 The movement information of the automobile given from the GPS receiving module 17 through the in-vehicle LAN 13 such as a multiplex communication line is received, and it is determined whether or not the automobile is stopped based on the movement information.

  If it is determined in step S07 that the automobile is stopped, the process proceeds to the next step S08, and the eighth functional unit of the microcomputer 5 instructs the door lock motor 7 to unlock the door.

  Thereafter, the process proceeds to step S09, the unlock time is stored in the nonvolatile memory 9 by the ninth functional unit of the microcomputer 5, and the process is terminated.

  In this way, the door is unlocked after a certain period of time, not immediately after the airbag module 3 detects a collision. It is possible to prevent instantaneous interruption and overlapping in the time axis, and it is possible to reliably unlock the door after a certain period of time.

  In addition, from the viewpoint of safety, when operating a load such as an airbag module that is indispensable to operate before and after the collision of an automobile, for example, the load is operated instantaneously. At that moment, a large amount of power is consumed, but at this point, the door is not unlocked, so that it concentrates on the power supply voltage of the load that is important for safety at the moment of the car collision. Power can be supplied and the voltage drop can be reduced.

  In this case, after the collision time is temporarily stored in the nonvolatile memory 9 in the sixth functional unit of the microcomputer 5, the time stored in the nonvolatile memory 9 and the time obtained by the clock module 15 are referred to. Since the door is unlocked when a certain time (second reference time) elapses or elapses from the collision time, even when the power to the microcomputer 5 is cut off, the interruption of the power supply causes the collision time to be stored in the nonvolatile memory 9. As long as the process is performed after the data is stored, the elapsed time from the collision time can be measured without any trouble after the microcomputer 5 is restored.

  Further, in the seventh functional unit of the microcomputer 5, the eighth functional unit is only used when the vehicle is stopped based on the information transmitted from the GPS receiving module 17 after a certain time has elapsed since the collision. Since the door is unlocked, it is possible to prevent the door from being unlocked while the automobile is running, and to prevent malfunction of unlocking.

  Furthermore, since the collision time and the unlock time are stored in the non-volatile memory 9, it is possible to use such information afterwards as a record when an accident occurs.

  In the above embodiment, the stop of the collision of the vehicle is recognized based only on the information from the GPS receiving module 17, but both the information from the vehicle speed sensor (not shown) and the information from the GPS receiving module 17 are used. And when one of the information is interrupted, the other information is used as valid information and whether or not the vehicle is stopped based on this information. You may judge.

  Alternatively, the seventh function unit (step S07) for determining whether or not the automobile is stopped may be omitted, and the door may be unlocked as it is after a certain period of time has elapsed.

  Moreover, in the said embodiment, it is judged in the 4th functional part (step S04) of the microcomputer 5 whether the power supply of the microcomputer 5 itself was interrupted, etc., and based on this, a 5th functional part (step S05) And the sixth functional unit (step S06) are branched to perform processing, but the fourth functional unit (step S04) and the fifth functional unit (step S05) of the microcomputer 5 are omitted, After the process of step S03 is performed by the third functional unit, the process of step S06 may be performed by the sixth functional unit as it is.

  Furthermore, in the above embodiment, not only the collision time but also the unlock time is stored in the non-volatile memory 9. However, if it is not necessary, the unlock time is not necessarily stored in the non-volatile memory 9. Also good.

1 is a block diagram showing an automobile door lock control device according to an embodiment of the present invention. It is a flowchart which shows operation | movement of the microcomputer of the door lock control apparatus for motor vehicles based on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact sensor 3 Airbag module 5 Microcomputer 7 Door lock motor 9 Non-volatile memory 11 Power supply circuit 13 In-vehicle LAN
15 Clock module 17 GPS reception module

Claims (5)

An automotive door lock control device for controlling door lock driving means for locking and unlocking a door in an automobile,
A time elapse judging means for judging whether or not a predetermined time has elapsed from the automobile collision time after the collision of the automobile is detected by the predetermined collision detecting means;
An automotive door lock control device comprising: an unlock instruction means for instructing the door lock drive means to unlock the door when the time passage judgment means determines that a predetermined time has elapsed since the collision time. The vehicle door lock control device according to claim 1,
A collision time storage means for recognizing a collision time of the automobile and storing the collision time in a predetermined nonvolatile storage means when a collision of the automobile is detected by the collision detection means;
The automobile door lock control device, wherein the time lapse determination means reads the collision time from the nonvolatile storage means and determines whether or not a first predetermined time has elapsed from the collision time. The vehicle door lock control device according to claim 1 or 2,
The vehicle further comprises stop determination means for determining whether the vehicle is stopped,
The vehicle door lock control device according to claim 1, wherein the unlock instruction means instructs the door lock drive means to unlock the door only when the stop determination means determines that the automobile is stopped. The vehicle door lock control device according to claim 2,
An automobile door lock control device further comprising an unlock time storage means for storing in the nonvolatile storage means the time when the unlock instruction means instructs the door lock drive means to unlock the door. The automobile door lock control device according to claim 2 or 4,
A power supply state detection means for detecting whether the power supply has been cut off or a certain power supply voltage drop has occurred after the automobile collision time;
Whether the second predetermined time has elapsed from the collision time of the vehicle given from the collision time storage means when the power supply state detection means detects that the power supply has not been shut off and a constant power supply voltage drop has occurred Further comprising other determination means for determining whether or not
Only when the time lapse determination means determines that the power supply state detection means has shut off the power supply or a constant power supply voltage drop, reads the collision time from the non-volatile storage means, and determines the predetermined time from the collision time. To determine whether or not
The first predetermined time elapses from the collision time by the time elapse judgment means only when the unlock instruction means judges that the power supply state detection means has shut off the power supply or a constant power supply voltage drop. When it is determined that the door lock driving means is unlocked when it is determined that the power supply state detection means determines that neither power interruption nor a constant power supply voltage drop has occurred, An automotive door lock control device that instructs the door lock driving means to unlock the door when another judging means judges that the second predetermined time has elapsed from the collision time.

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