JP4282299B2 - Keyless entry system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyless entry system that performs door lock and door unlock.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a so-called keyless entry system in which a user operates a remote controller to lock or unlock a door of a vehicle (see, for example, Japanese Patent Application Laid-Open No. 11-141211).
[0003]
[Problems to be solved by the invention]
However, the conventional keyless entry system has a problem that it is not convenient for the user because the user needs to hold the remote control in his hand and operate a switch provided on the remote control.
[0004]
An object of the present invention is to provide a keyless entry system with improved convenience.
[0005]
[Means for Solving the Problems]
  The keyless entry system according to the present invention is:Lock or unlock a plurality of lock mechanisms provided in the vehicle based on the code information transmitted from the portable radio wave transmitting / receiving means carried by the vehicle user and received by the radio wave receiving means.A keyless entry system,The vibration impact state detection means for detecting the state of the vibration shock applied to the vehicle, and when the security code information received by the radio wave reception means matches the security code information set in advance, the vibration impact state detection means Lock control means for controlling the plurality of lock mechanisms to a preset state according to the number or pattern of detected vibration shocks.It is characterized by that.
[0006]
  In the keyless entry system according to the present invention,The personal identification code information transmitted from the portable radio transmission / reception unit is received by the radio wave reception unit, and the lock control unit determines whether the personal identification code information matches the preset personal identification code information. When they coincide with each other, the lock control unit controls the lock mechanism to a preset state in accordance with the number or pattern of vibration shocks detected by the vibration shock state detection unit. Thereby, when the user wearing the portable radio wave transmitting / receiving means gives an impact to the vehicle, the lock mechanism is controlled in a preset state. Therefore, the lock mechanism is set in a preset state without requiring the user to operate the remote control.The convenience of the keyless entry system can be improved. In addition, since a series of operations for collating PIN code information is triggered by the user's impact on the vehicle, etc., a predetermined radio signal transmitted from the portable radio transceiver is constantly monitored. Power consumption can be reduced compared to what is done.
  Further, the apparatus further comprises radio wave transmission means for transmitting a predetermined radio wave signal when a vibration shock is detected by the vibration impact state detection means, wherein the portable radio wave transmission / reception means receives the predetermined radio wave signal from the radio wave transmission means. When the password is received, it is preferable to transmit the code information.
[0007]
  In addition, alarm means for notifying an abnormal state is further provided, and the lock control means is a radio wave receiving means.Security code information receivedIs not coincident with the preset code information, it is preferable to output a control signal to the alarm means so that the alarm means notifies the abnormal state. When comprised in this way, it can alert | report reliably that abnormal states, such as theft, generate | occur | produced.
[0008]
  Also,Preferably, the lock control means selectively locks or unlocks a lock mechanism corresponding to the number or pattern of vibration shocks detected by the vibration shock state detection means among the plurality of lock mechanisms. The plurality of lock mechanisms include a door lock mechanism and a luggage compartment trunk lock mechanism.It is preferable. When configured in this way,When the user wearing the portable radio wave transmission / reception means gives an impact to the vehicle, the door lock mechanism is locked or unlocked, or the luggage compartment trunk lock mechanism is locked or unlocked. Become. Accordingly, the doorless mechanism can be set to the locked state or unlocked state or the luggage compartment trunk lock mechanism can be set to the locked state or unlocked state without requiring the user to operate the remote control. The convenience ofCan be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A keyless entry system according to an embodiment of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.
[0016]
(First embodiment)
First, the configuration of the keyless entry system according to the present embodiment will be described with reference to the block diagram shown in FIG. The keyless entry system ES1 includes a portable radio wave transmission / reception unit 11 and an in-vehicle lock control unit 21. The radio wave transmission / reception unit 11 includes a radio wave transmission / reception unit 13 (portable radio wave transmission / reception means), an antenna 15, a power supply unit (not shown), and the like.
[0017]
The radio wave transmission / reception unit 13 receives a predetermined radio wave signal transmitted from the lock control unit 21 by the antenna 15. When the radio wave transmitting / receiving unit 13 receives the predetermined radio wave signal, the radio wave transmitting / receiving unit 13 generates a predetermined radio wave signal including the code code information based on the predetermined radio wave signal and transmits it from the antenna 15.
[0018]
The lock control unit 21 includes a door lock drive unit 23 (door lock drive unit), a vibration impact state detection unit 25 (vibration shock state detection unit), a radio wave transmission unit 27 (radio wave transmission unit), and a radio wave reception unit 29 (radio wave reception unit). ), A lock control unit 31 (lock control unit), an alarm unit 33 (alarm unit), antennas 35 and 37, and the like.
[0019]
The door lock drive unit 23 sets the door lock mechanism 39 to a locked state or an unlocked state, and includes a door lock actuator or the like. The door lock driving unit 23 operates to lock the door lock mechanism 39 by a lock signal sent from the lock control unit 31, and the door lock mechanism 39 is turned on by an unlock signal sent from the lock control unit 31. Operates to unlock.
[0020]
The vibration impact state detection unit 25 detects the state of vibration of the vehicle or the state of impact applied to the vehicle, and a shock sensor used in an anti-theft device can be used. As shown in FIG. 2, the vibration / impact state detection unit 25 is disposed in the vicinity of the side window glass SW, and is configured to detect vibration generated by the user knocking the side window glass SW. ing. When the vibration / impact state detector 25 detects a vibration of the vehicle or an impact applied to the vehicle, the vibration / impact state detector 25 sends a detection signal.
[0021]
The radio wave transmission unit 27 receives a detection signal from the vibration / impact state detection unit 25, generates a predetermined radio signal based on the detection result of the vibration / impact state detection unit 25, and transmits it from the antenna 35.
[0022]
The radio wave reception unit 29 receives a predetermined radio wave signal including the code code information from the radio wave transmission / reception unit 11 (radio wave transmission / reception unit 13) by the antenna 37. The radio wave reception unit 29 sends a predetermined radio wave signal including the received code information to the lock control unit 31.
[0023]
The lock control unit 31 is a CPU that executes various arithmetic processes according to a preset control program, a ROM that stores control programs and control data in advance, and various data necessary for executing various arithmetic processes are temporarily read and written. RAM included. The lock control unit 31 determines whether or not the code code information included in the predetermined radio signal received by the radio wave receiving unit 29 matches the code code information set in advance. The lock drive unit 23 outputs a control signal to the door lock drive unit 23 so that the door lock mechanism 39 is unlocked.
[0024]
In addition, the lock control unit 31 controls the alarm unit 33 so that the alarm unit 33 notifies the abnormal state when the code code information included in the predetermined radio wave signal does not match the preset code code information. Output a signal. The preset code information is stored and stored in the ROM.
[0025]
The alarm unit 33 is for notifying an abnormal state based on a control signal from the lock control unit 31, and is configured to generate an alarm sound and / or alarm light outside the vehicle.
[0026]
Next, the operation of the keyless entry system ES1 will be described based on the flowchart shown in FIG.
[0027]
First, when the user knocks the side window glass, the vibration and shock state detection unit 25 detects the generated vibration or the like (“YES” in S101), and sends a detection signal to the radio wave transmission unit 27 (S103). When the radio wave transmission unit 27 receives a detection signal sent from the vibration impact state detection unit 25 (S201), a predetermined radio wave signal is generated (S203) and transmitted (S205).
[0028]
When the radio wave transmission / reception unit 13 of the radio wave transmission / reception unit 11 receives a predetermined radio wave signal transmitted from the radio wave transmission unit 27 of the lock control unit 21 (S301), a predetermined radio wave signal including the code information is generated. (S303). When a predetermined radio signal including the code information is generated, the predetermined radio signal including the code information is transmitted from the radio transmission / reception unit 13 (S305).
[0029]
When the radio wave receiving unit 29 of the lock control unit 21 receives a predetermined radio wave signal including the code code information transmitted from the radio wave transmitting / receiving unit 13 of the radio wave transmitting / receiving unit 11 (S401), the predetermined radio signal including the code code information is received. The radio wave signal is transmitted from the radio wave receiving unit 29 (S403).
[0030]
When the lock control unit 31 receives a predetermined radio signal including the code code information transmitted from the radio wave receiving unit 29 (S501), the code code information included in the received predetermined radio signal is set in advance. Is matched (S503). When the lock control unit 31 determines that the password code information included in the received predetermined radio wave signal matches the password code information set in advance (“YES” in S503), the door lock mechanism 39 is unlocked. A control signal is output to the door lock drive unit 23 so as to be in a state (S505). As a result, the door lock drive unit 23 operates to bring the door lock mechanism 39 into the unlocked state.
[0031]
On the other hand, when the lock control unit 31 determines that the password code information included in the received predetermined radio wave signal does not match the password code information set in advance ("NO" in S503), the abnormal state is notified. Thus, a control signal is output to the alarm unit 33 (S507). As a result, it is notified outside the vehicle that an abnormal state such as theft has occurred.
[0032]
As described above, in the keyless entry system ES1 of the present embodiment, the door lock mechanism 39 is provided by applying a shock to the vehicle such that the user wearing the radio wave transmission / reception unit 11 knocks the side window glass SW. It becomes unlocked. Therefore, the door lock mechanism 39 can be unlocked without requiring the user to operate the remote control, and the convenience of the keyless entry system ES1 can be improved. In addition, since a series of operations for collating the code information is started with a trigger given by the user as an impact on the vehicle, a predetermined transmission transmitted from the radio wave transmission / reception unit 11 (radio wave transmission / reception unit 13) is started. Power consumption can be reduced as compared with the one that constantly monitors radio signals.
[0033]
In addition, the keyless entry system ES1 of the present embodiment further includes an alarm unit 33, and the lock control unit 31 is preset with code code information included in a predetermined radio wave signal received by the radio wave receiver 29. When the code code information does not match, the control signal is output to the alarm unit 33 so that the alarm unit 33 notifies the abnormal state. Accordingly, it is possible to reliably notify that an abnormal state such as theft has occurred.
[0034]
In the keyless entry system ES1 of the present embodiment, the vibration impact state detection unit 25 is disposed in the vicinity of the side window glass SW. Thereby, the impact etc. which the user who gets on and off the vehicle gives can be detected reliably, and the convenience of the keyless entry system ES1 can be further improved.
[0035]
(Second Embodiment)
Next, the configuration of the keyless entry system according to the present embodiment will be described with reference to the block diagram shown in FIG. This keyless entry system ES2 includes a portable radio wave transmission / reception unit 11 and an in-vehicle lock control unit 21.
[0036]
The lock control unit 21 further includes a cargo compartment trunk lock driving unit 41 (load compartment trunk lock driving means). The cargo compartment trunk lock drive unit 41 is for bringing the cargo compartment trunk lock mechanism 43 into a locked state or an unlocked state, and is constituted by a door lock actuator or the like. The cargo compartment trunk drive unit 41 operates to lock the cargo compartment trunk lock mechanism 43 by the lock signal sent from the lock control unit 31, and the cargo compartment trunk lock drive unit 41 receives the cargo by the unlock signal sent from the lock control unit 31. The chamber trunk lock mechanism 43 is operated to be unlocked.
[0037]
The output of the vibration / impact state detection unit 25 is connected to the lock control unit 31, and the vibration / impact state detection unit 25 also sends a detection signal to the lock control unit 31. The lock control unit 31 determines whether or not the code code information included in the predetermined radio signal received by the radio wave receiving unit 29 matches the code code information set in advance. Then, if they match, the lock control unit 31 determines that the door lock drive unit 23 makes the door lock mechanism 39 locked or unlocked based on the detection signal from the vibration impact state detection unit 25. A control signal is output to the drive unit 23, or the control signal is output to the cargo compartment trunk drive unit 41 so that the cargo compartment trunk lock drive unit 41 unlocks the cargo compartment trunk lock mechanism 43.
[0038]
As shown in FIG. 5, the vibration / impact state detection unit 25 is disposed in at least one of the vicinity of the side window glass SW, the vicinity of the front window glass FW, and the vicinity of the luggage compartment trunk T. For example, when arranged near the side window glass SW, the vibration / impact state detection unit 25 detects vibration generated by the user knocking on the side window glass SW. Moreover, when arrange | positioned in front window glass FW vicinity, the vibration impact state detection part 25 detects the vibration generate | occur | produced when a user knocks the front window glass FW. Further, when arranged near the cargo compartment trunk T, the vibration / impact state detection unit 25 detects vibration generated when the user knocks the rear gate (rear window glass) or the trunk lid.
[0039]
Next, the operation of the keyless entry system ES2 will be described based on the flowchart shown in FIG. The operations of the vibration / impact state detection unit 25, the radio wave transmission unit 27, the radio wave transmission / reception unit 13, and the radio wave reception unit 29 are the same as those in the first embodiment described above, and thus illustration and description thereof are omitted.
[0040]
When the lock control unit 31 receives a predetermined radio signal including the code code information transmitted from the radio wave receiving unit 29 (S601), the code code information included in the received predetermined radio signal is set in advance. Is matched (S603). When the lock control unit 31 determines that the password code information included in the received predetermined radio signal matches the password code information set in advance (“YES” in S603), the vibration impact state detection unit 25 The sent detection signal is received (S605), and the state of vibration of the vehicle or the state of impact applied to the vehicle is recognized based on the received detection signal (S607). For example, when the vibration impact state detection unit 25 is disposed in the vicinity of the side window glass SW, the lock control unit 31 is given to the vehicle vibration state detected by the vibration impact state detection unit 25 or to the vehicle. Whether the impact is due to the user knocking the side window glass SW once, whether it is due to knocking twice, or because it is knocking three times, It is recognized by comparing with a pattern such as vibration set in advance whether it is due to other reasons.
[0041]
In the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the state of the vibration of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is When it is recognized that the window glass SW has been knocked once (“YES” in S609), a control signal is sent to the door lock drive unit 23 so that the door lock mechanism 39 is unlocked. Is output (S611). As a result, the door lock drive unit 23 operates to bring the door lock mechanism 39 into the unlocked state.
[0042]
Further, in the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the vibration state of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is determined by the user. Control the door lock drive unit 23 to lock the door lock mechanism 39 when it is recognized that it is caused by knocking the side window glass SW twice ("YES" in S613). A signal is output (S615). As a result, the door lock drive unit 23 operates to bring the door lock mechanism 39 into the locked state.
[0043]
Further, in the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the vibration state of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is determined by the user. Recognizes that the side window glass SW has been knocked three times (“YES” in S617), the luggage compartment trunk lock drive unit is set so that the luggage compartment trunk lock mechanism 43 is unlocked. A control signal is output to 41 (S619). As a result, the cargo compartment trunk lock drive unit 41 operates to bring the cargo compartment trunk lock mechanism 43 into an unlocked state.
[0044]
On the other hand, when it is determined by the lock control unit 31 that the password code information included in the received predetermined radio signal does not match the password code information set in advance (“NO” in S603), and the vibration shock The state of the vehicle vibration detected by the state detection unit 25 or the state of the impact applied to the vehicle is recognized to be other than that caused by the user knocking the side window glass SW once to three times. In the case (“NO” in S617), a control signal is output to the alarm unit 33 so as to notify the abnormal state (S621). As a result, it is notified outside the vehicle that an abnormal state such as theft has occurred.
[0045]
As described above, in the keyless entry system ES2 of the present embodiment, when the user wearing the radio wave transmission / reception unit 11 gives an impact to the vehicle, the door lock mechanism 39 is in the locked state or unlocked state, or The cargo compartment trunk lock mechanism 43 is unlocked. Therefore, the door lock mechanism 39 can be locked or unlocked, or the luggage compartment trunk lock mechanism 43 can be unlocked, without requiring the user to operate the remote control. The keyless entry system ES2 Convenience can be improved. In addition, since a series of operations for collating the code information is started with a trigger given by the user as an impact on the vehicle, a predetermined transmission transmitted from the radio wave transmission / reception unit 11 (radio wave transmission / reception unit 13) is started. Power consumption can be reduced as compared with the one that constantly monitors radio signals.
[0046]
Further, in the keyless entry system ES2 of the present embodiment, the vibration / impact state detection unit 25 is disposed in at least one of the vicinity of the side window glass SW, the vicinity of the front window glass FW, and the vicinity of the luggage compartment trunk T. Yes. Thereby, it is possible to reliably detect an impact or the like given by a user who gets on or off the vehicle or loads and unloads the luggage, and the convenience of the keyless entry system ES2 can be further improved.
[0047]
(Third embodiment)
Next, the configuration of the keyless entry system according to the present embodiment will be described with reference to the block diagram shown in FIG. The keyless entry system ES3 includes an in-vehicle lock control unit 21. The lock control unit 21 of the third embodiment has a configuration in which the radio wave transmission unit 27, the radio wave reception unit 29, the antennas 35 and 37, and the like are omitted from the lock control unit 21 of the second embodiment described above.
[0048]
The output of the vibration / impact state detection unit 25 is connected to the lock control unit 31 as in the second embodiment, and the vibration / impact state detection unit 25 sends a detection signal to the lock control unit 31. Based on the detection signal from the vibration / impact state detection unit 25, the lock control unit 31 controls the door lock drive unit 23 so that the door lock drive unit 23 sets the door lock mechanism 39 to the locked state or the unlocked state. A signal is output, the cargo compartment trunk lock drive unit 41 outputs a control signal to the cargo compartment trunk lock drive unit 41 so that the cargo compartment trunk lock mechanism 43 is unlocked, or the alarm unit 33 is in an abnormal state. To output a control signal to the alarm unit 33.
[0049]
As in the second embodiment, the vibration / impact state detection unit 25 is disposed in at least one of the vicinity of the side window glass SW, the vicinity of the front window glass FW, and the vicinity of the luggage compartment trunk T.
[0050]
Next, the operation of the keyless entry system ES3 will be described based on the flowchart shown in FIG.
[0051]
First, the lock control unit 31 receives a detection signal sent from the vibration / impact state detection unit 25 (S701), and determines the state of vibration of the vehicle or the state of impact applied to the vehicle based on the received detection signal. Recognize (S703). For example, when the vibration / impact state detection unit 25 is disposed in the vicinity of the side window glass SW, the lock control unit 31 is a vibration whose vehicle vibration state detected by the vibration / impact state detection unit 25 is predetermined. It is confirmed whether or not the pattern matches (S704). The vibration pattern is constituted by detecting vibrations a plurality of times. If the pattern is “3 · 2 · 1”, it is expressed by combining fine vibrations three times, twice, and once. When the vibration pattern detected by the vibration impact state detection unit 25 is different from the predetermined vibration pattern (“NO” in S704), a control signal is output to the alarm unit 33 so as to notify the abnormal state. (S717). As a result, it is notified outside the vehicle that an abnormal state such as theft has occurred.
[0052]
In the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the vibration state of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is the vibration pattern 1. Is recognized (“YES” in S705), a control signal is output to the door lock drive unit 23 so that the door lock mechanism 39 is unlocked (S707). As a result, the door lock drive unit 23 operates to bring the door lock mechanism 39 into the unlocked state.
[0053]
Further, in the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the vibration state of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is a vibration. If it is recognized that the pattern matches the pattern 2 (“YES” in S709), a control signal is output to the door lock drive unit 23 so that the door lock mechanism 39 is locked (S711). As a result, the door lock drive unit 23 operates to bring the door lock mechanism 39 into the locked state.
[0054]
Further, in the lock control unit 31, based on the detection signal from the vibration / impact state detection unit 25, the vibration state of the vehicle detected by the vibration / impact state detection unit 25 or the state of the shock applied to the vehicle is a vibration. When it is recognized that the pattern 3 matches the pattern 3 (“YES” in S713), a control signal is output to the luggage compartment trunk drive unit 41 so that the luggage compartment trunk lock mechanism 43 is unlocked. (S715). As a result, the cargo compartment trunk lock drive unit 41 operates to bring the cargo compartment trunk lock mechanism 43 into an unlocked state.
[0055]
As described above, in the keyless entry system ES3 of the present embodiment, when the user gives an impact to the vehicle, the door lock mechanism 39 is locked or unlocked, or the luggage compartment trunk lock mechanism 43 is unlocked. It becomes locked. Further, when an abnormal state such as theft occurs, the abnormal state is notified by the alarm means. Accordingly, the door lock mechanism 39 can be locked or unlocked, or the luggage compartment trunk lock mechanism 43 can be unlocked without requiring the user to operate the remote control, and the keyless entry system ES3. Convenience can be improved.
[0056]
The present invention is not limited to the embodiment described above. In the second and third embodiments, when the vibration / impact state detection unit 25 detects the state of vibration of a predetermined vehicle or the state of impact given to the vehicle, the lock control unit 31 detects the state of the luggage compartment trunk lock mechanism. You may comprise so that a control signal may be output with respect to the luggage compartment trunk clock drive part 41 so that 43 may be in a locked state. Further, the third embodiment may be combined with the first or second embodiment.
[0057]
【The invention's effect】
According to the present invention, a keyless entry system with improved convenience can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a keyless entry system according to a first embodiment.
FIG. 2 is a diagram for explaining an arrangement position of a vibration impact state detection unit included in the keyless entry system according to the first embodiment.
FIG. 3 is a flowchart for explaining the operation of the keyless entry system according to the first embodiment.
FIG. 4 is a block diagram showing a keyless entry system according to a second embodiment.
FIG. 5 is a diagram for explaining an arrangement position of a vibration impact state detection unit included in a keyless entry system according to a second embodiment.
FIG. 6 is a flowchart for explaining the operation of the keyless entry system according to the second embodiment.
FIG. 7 is a block diagram showing a keyless entry system according to a third embodiment.
FIG. 8 is a flowchart for explaining the operation of the keyless entry system according to the third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Radio wave transmission / reception unit, 13 ... Radio wave transmission / reception part, 21 ... Lock control unit, 23 ... Door lock drive part, 25 ... Vibration shock state detection part, 27 ... Radio wave transmission part, 29 ... Radio wave reception part, 31 ... Lock control part 33 ... alarm unit, 39 ... door lock mechanism, 41 ... loading room trunk lock drive unit, 43 ... loading room trunk lock mechanism, ES1 to ES3 ... keyless entry system, FW ... front window glass, SW ... side window glass, T ... luggage compartment trunk.

Claims (5)

A keyless entry system that locks or unlocks a plurality of lock mechanisms provided in a vehicle based on password information transmitted from a portable radio wave transmitting / receiving means carried by a vehicle user and received by the radio wave receiving means,
Vibration shock state detection means for detecting the state of vibration shock given to the vehicle;
When the security code information received by the radio wave receiving means coincides with the security code information set in advance, the plurality of lock mechanisms are set according to the number or pattern of vibration shocks detected by the vibration shock state detection means. Lock control means for controlling to a preset state;
A keyless entry system characterized by comprising: A radio wave transmission unit that transmits a predetermined radio wave signal when a vibration shock is detected by the vibration shock state detection unit;
2. The keyless entry system according to claim 1, wherein the portable radio wave transmitting / receiving unit transmits the personal identification code information when receiving the predetermined radio wave signal from the radio wave transmitting unit. It further has an alarm means for notifying the abnormal state,
The lock control means controls the alarm means so that the alarm means informs of an abnormal state when the code information received by the radio wave receiving means does not match the preset code information. The keyless entry system according to claim 1 or 2 , wherein a signal is output. The lock control means selectively locks or unlocks a lock mechanism corresponding to the number or pattern of vibration shocks detected by the vibration shock state detection means among the plurality of lock mechanisms. Item 4. The keyless entry system according to any one of Items 1 to 3. The keyless entry system according to any one of claims 1 to 4, wherein the plurality of lock mechanisms include a door lock mechanism and a cargo compartment trunk lock mechanism.

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