JP3930386B2 - Electronic key system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic key system in which a predetermined operation of a vehicle is executed without a key operation by wireless communication between the electronic key and the vehicle.
[0002]
[Prior art]
FIG. 4 is a circuit diagram showing an electrical configuration of a conventional vehicle 51. The vehicle 51 is equipped with a plurality of ECUs 52, 53,. As these ECUs 52 and 53, there are, for example, a navigation ECU 52 that operates a car navigation system and an airbag ECU 53 that operates an airbag device in accordance with the in-vehicle equipment of the vehicle 51. The vehicle 51 is equipped with a battery 54 as a power source for the vehicle. The battery 54 is connected to the ECUs 52 and 53 via the power line 55 and supplies electric power to the ECUs 52 and 53.
[0003]
The vehicle 51 is provided with an ignition switch 56 that is operated when the engine is started. The ignition switch 56 is interposed between the ECUs 52 and 53 and the battery 54. The ignition switch 56 can be operated in the order of an OFF position, an ACC (accessory) position, an ON (ignition on) position, and a START position. When the ignition switch 56 is turned from the ON position to the START position, the engine starts. Further, when the ignition switch 56 is turned on, the ECUs 52 and 53 and the battery 54 are energized and the ECUs 52 and 53 are activated.
[0004]
[Problems to be solved by the invention]
By the way, since setting processing such as destination setting by the navigation ECU 52 is prohibited during traveling, this type of setting processing is performed when the ignition switch 56 is turned on, but the GPS (Global Positioning System) reception state is unstable. In some cases, it may take several seconds for the reception state to stabilize. The airbag ECU 53 performs an initial self-diagnosis (collision discrimination diagnosis) before traveling when the ignition switch 56 is turned on, and the self-diagnosis takes several seconds.
[0005]
However, there are cases where the engine starts running immediately after the engine is started, and each process such as a reception state check by the navigation ECU 52 and an initial self-diagnosis by the airbag ECU 53 takes several seconds. It may be later. However, since it is preferable that the reception state check of the navigation ECU 52 and the initial self-diagnosis of the airbag ECU 53 are finished before traveling, some countermeasures are necessary.
[0006]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an electronic key system that can keep an in-vehicle device usable even if the engine starts running immediately after the engine is started. Is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention according to claim 1 is provided with a control unit for controlling the in-vehicle device, and is operated when the engine is started in an electronic key system in which power is supplied from a power source to the control unit. The connection state between the control unit and the power source is switched between the operating unit, the collating unit that collates the identification code of the electronic key taken from the outside and the identification code registered in advance on the vehicle side. Therefore, it is located in parallel with the operation means. When the identification code matches with the switch means based on the collation result of the collation means, the operation means of operation Based on the start of power supply to the control unit The gist of the present invention is that it comprises control means for switching the connection state of the switch means to activate the control unit so that power from the power source is supplied to the control unit.
[0008]
According to the present invention, for example, when a driver carrying an electronic key approaches the vehicle, the identification code of the electronic key is output from the electronic key. Then, the collation means takes in the identification code and collates it with the identification code of the electronic key and the code registered in advance on the vehicle side. If the identification codes match based on the collation result of the collation means, the control means switches the connection state of the connection means and starts supplying power to the control unit before the operation means is operated to the ignition-on state. To start the control unit.
[0009]
By the way, the control unit performs an initial operation immediately before the power source is supplied and at a stage before the in-vehicle device can be used. However, prior to the operation of the operating means that is performed after the driver gets into the vehicle, the control unit is supplied with power and the initial operation is performed. The initial operation is completed, and the vehicle-mounted device can be used at the same time as the vehicle starts running.
[0010]
According to a second aspect of the present invention, in the first aspect of the present invention, the control means may determine that the two identification codes are based on the collation result of the collation means before the operation means is operated to the ignition-on state. The gist is to switch the connection state of the switch means and start supplying power to the control unit at the coincident timing.
[0011]
According to this invention, in addition to the operation of the invention described in claim 1, since the control means starts supplying power to the control unit at the timing when the identification code matches at the time of code collation by the collation means, the ignition on state is preceded. Thus, it becomes possible to start the control unit from the time when the identification codes match.
[0012]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the control means takes in a transmission signal on which the identification code of the electronic key is placed, and locks the door of the vehicle based on the transmission signal. The control means is configured to unlock or lock, and when the two identification codes match based on the collation result of the collation means, the control means unlocks the door lock of the vehicle and connects the switch means. And starting the power supply to the control unit.
[0013]
According to this invention, in addition to the operation of the invention described in claim 1 or 2, the door lock is unlocked and the power supply to the control unit is started when the identification code matches when the code is verified by the verification means. Therefore, the control unit is activated almost simultaneously with the unlocking of the door lock. Therefore, since there is a sufficient time until the driver gets into the vehicle and starts traveling, the initial operation of the control unit can be almost certainly finished before starting traveling.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an electronic key system embodying the present invention will be described with reference to FIGS.
[0015]
FIG. 2 is a schematic diagram showing the overall configuration of the electronic key system 1. The electronic key system 1 is a system that performs predetermined key operations wirelessly, and includes an electronic key (smart key) 2 that can be freely carried and a controller 4 mounted on the vehicle 3. The electronic key 2 and the controller 4 can wirelessly communicate, and the controller 4 exchanges various signals (radio waves) with the electronic key 2 via the antennas 5 to 8 mounted on the vehicle 3.
[0016]
These antennas 5 to 8 include a coil antenna 5 installed on the left and right doors 9, a coil antenna 6 installed in the driver's seat, a receiving antenna 7, and an immobilizer coil antenna 8. Further, the antenna 5 can wirelessly communicate with the electronic key 2 within the area E1, the antenna 6 within the area E2, and the antenna 8 within the area E3. The antennas 5 to 8 and the controller 4 are connected to each other by signal lines (communication cables).
[0017]
FIG. 1 is an electrical configuration diagram of the electronic key system 1. The electronic key system 1 includes a smart key system 10. The smart key system 10 has a keyless entry function in which the door lock is automatically unlocked when the owner carries the electronic key 2 and approaches the door of the vehicle 3, and is automatically locked when the owner moves away. The smart key system 10 also has an ignition function for starting the engine by turning an ignition knob (all not shown) without inserting the key plate of the electronic key 2 into the engine starting cylinder beside the handle.
[0018]
More specifically, the electronic key 2 includes a microcomputer 11, a receiving circuit 12, and a transmitting circuit 13. The receiving circuit 12 receives a request signal (radio wave) output from the vehicle 3 via the antenna 14 and outputs the signal to the microcomputer 11. When the microcomputer 11 receives the request signal, the microcomputer 11 generates an ID code signal corresponding to the ID code (identification code) of the electronic key 2, and the transmission circuit 13 modulates the signal and converts it into a radio wave having a predetermined frequency. (Radio wave) S _a Is transmitted to the outside via the antenna 15.
[0019]
On the other hand, the controller 4 is equipped with a smart ECU 16, a transmission circuit 17, and a reception circuit 18 as collation means and control means. The transmission circuit 17 converts the request signal output from the smart ECU 16 into a radio wave having a predetermined frequency, and transmits the request signal to the outside via the antenna 5 or the antenna 6. The receiving circuit 18 receives an external ID code signal via the antenna 7, demodulates the ID code signal into a pulse signal, and outputs the pulse signal to the smart ECU 16.
[0020]
The smart ECU 16 includes a CPU (not shown), a memory 19 and the like, and the memory 19 stores an ID code. When the smart ECU 16 inputs the ID code signal via the antenna 7, the smart ECU 16 executes code verification between the ID code and the ID code in the memory 19. Further, the smart ECU 16 operates the door lock driving device 20, the steering lock driving device 21, and the engine control device 22 mounted on the vehicle 3 based on the ID code signal.
[0021]
The vehicle 3 is equipped with a signal changeover switch 23 for switching the antenna of the transmission circuit 17, and the signal changeover switch 23 is connected to the smart ECU 16. The signal changeover switch 23 outputs an off signal to the smart ECU 16 when the driver is in a state before entering the vehicle 3, and an on signal when the driver opens the door 9 and enters the vehicle 3 to close the door 9. . The smart ECU 16 transmits a request signal from the antenna 5 when an off signal is input from the signal selector switch 23, and transmits a request signal from the antenna 6 when an on signal is input from the signal selector switch 23.
[0022]
The vehicle 3 is equipped with an ignition switch 24 as operating means and a battery 25 as a power source. The ignition switch 24 is switched to the OFF, ACC (accessory), ON (ignition on), and START positions by a normal key operation in which the electronic key 2 is inserted into the cylinder and turned. Further, when the ignition switch 24 is in the ignition-on state, the controller 4 and the battery 25 are energized, and the electric power of the battery 25 is supplied to the smart ECU 16 and the like.
[0023]
Here, the smart key system 10 operates as follows. First, when the door 9 is locked, an off signal is output from the signal changeover switch 23. And smart ECU16 transmits a request signal intermittently from the antenna 5 based on this OFF signal. When the driver who owns the electronic key 2 enters the area E1 (see FIG. 2), the electronic key 2 receives the request signal through the antenna 14, operates the microcomputer 11, and sends the ID code signal S from the antenna 15. _a To send. That is, the electronic key 2 stands by in the standby mode, and only when the request signal is received, the ID code signal S _a Is automatically sent back.
[0024]
Then, the smart ECU 16 sends the ID code signal S via the antenna 7 and the receiving circuit 18. _a And the ID code is collated with the ID code stored in the memory 19. If the received ID code matches the ID code in the memory 19 and an off signal is input from the signal changeover switch 23, the smart ECU 16 operates the door lock driving device 20 to unlock the door lock. On the other hand, if the two ID codes do not match, the smart ECU 16 keeps the door lock locked. Therefore, the driver can automatically unlock the door lock without key operation by this smart entry function.
[0025]
Subsequently, when the driver gets into the driver's seat and the door 9 is closed, the signal changeover switch 23 outputs an ON signal, and the smart ECU 16 intermittently sends a request signal from the antenna 6 instead of the antenna 5 based on the ON signal. Make a call. Then, the electronic key 2 receives the request signal from the antenna 14 within the area E2 (see FIG. 2), operates the microcomputer 11 and receives the ID code signal S from the antenna 15. _a To send. The smart ECU 16 receives the ID code signal S via the antenna 7 and the receiving circuit 18. _a And the ID code is collated with a previously stored ID code.
[0026]
At this time, the smart ECU 16 permits the engine to start if the received ID code matches the ID code in the memory 19 and an ON signal is input from the signal changeover switch 23. That is, the smart ECU 16 drives the steering lock driving device 21 to unlock the steering lock (not shown), and outputs an engine start permission signal to the engine control device 22. Then, based on the engine start permission signal, the engine control device 22 starts the engine by performing engine ignition and fuel injection when the ignition knob is turned. Therefore, the driver who owns the electronic key 2 can start the engine only by turning the ignition knob by this ignition function without operating the key mechanically.
[0027]
On the other hand, even if the smart ECU 16 receives an ON signal from the signal changeover switch 23, if the two ID codes do not match, the smart ECU 16 operates the immobilizer function and does not allow the engine to start. That is, the smart ECU 16 does not output an engine start permission signal to the engine control device 22, and the engine control device 22 does not perform fuel injection (or engine ignition) and does not start the engine even when the ignition knob is turned. For this reason, since the ignition function does not operate unless the ID code of the electronic key 2 matches the ID code of the smart ECU 16, the engine can be prevented from being started without permission by a third party who does not own the electronic key 2.
[0028]
By the way, the microcomputer 11 of the electronic key 2 is operated by a battery (not shown). Even if the electronic key 2 receives a request signal when the battery runs out, the ID code signal S _a Cannot be sent and code verification cannot be performed. Therefore, the electronic key system 1 includes an immobilizer system 26 corresponding to this. More specifically, the electronic key 2 includes a transponder 27 made up of one IC chip. The transponder 27 includes a coil antenna 28, a power circuit 29, and a transponder control circuit 30.
[0029]
The antenna 28 receives the drive radio wave (electromagnetic field) from the vehicle 3 in the region E3 (see FIG. 2), and the power circuit 29 generates power based on the drive radio wave and supplies the power to the transponder control circuit 30. The transponder control circuit 30 has a built-in memory 31, and the memory 31 stores a transponder ID code. Then, the transponder control circuit 30 generates a transponder signal corresponding to the ID code using the power from the power circuit 29 as a power source, modulates the signal and converts it into a radio wave of a predetermined frequency (radio wave) S. _b Is transmitted to the outside through the antenna 28.
[0030]
On the other hand, the controller 4 includes an immobilizer ECU 32, a transponder transmission / reception circuit 33, and an amplification circuit 34. The transponder transmission / reception circuit 33 generates an electromagnetic field in the antenna 8 based on a control signal output from the immobilizer ECU 32, and the antenna 8 transmits a driving radio wave to the outside as the electromagnetic field is generated. The transponder transmission / reception circuit 33 receives an external transponder signal via the antenna 8, demodulates the transponder signal into a pulse signal, amplifies it by the amplification circuit 34, and outputs it to the immobilizer ECU 32.
[0031]
The immobilizer ECU 32 includes a CPU (not shown), a memory 35, and the like, and the memory 35 stores an ID code. When the immobilizer ECU 32 receives a transponder signal from the outside via the antenna 8, the immobilizer ECU 32 collates the ID code of the received transponder signal with the ID code of the memory 35. The immobilizer ECU 32 does not output the engine start permission signal to the engine control device 22 when the two ID codes do not match, and transmits the encrypted engine start permission signal to the engine control device 22 when the two ID codes match. Output.
[0032]
Here, when the battery of the electronic key 2 runs out, the immobilizer system 26 using the electronic key 2 operates as follows. First, a driver outside the vehicle gets into the driver's seat and inserts the key plate of the electronic key 2 into the engine starting cylinder. When the electronic key 2 enters the area E3 (see FIG. 2), the transponder 27 receives the intermittently transmitted driving radio wave via the antenna 28, and operates the transponder control circuit 30 from the antenna 28. Transponder signal S _b Is automatically sent.
[0033]
Then, the immobilizer ECU 32 transmits the transponder signal S via the antenna 8, the transponder transmission / reception circuit 33, and the amplification circuit 34. _b The ID code and the ID code in the memory 35 are collated. If the received ID code does not match the ID code in the memory 35, the immobilizer ECU 32 does not allow engine start, keeps the steering lock locked, and does not output an engine start permission signal to the engine control device 22. For this reason, the engine control device 22 forcibly cuts fuel injection (or engine ignition) and does not start the engine even when an ignition knob or key operation is performed due to the non-input of the engine start permission signal.
[0034]
On the other hand, if the two ID codes match, the immobilizer ECU 32 permits engine start, unlocks the steering lock, and outputs an engine start permission signal to the engine control device 22. Then, the engine control device 22 is in a state where the engine start is permitted based on the engine start permission signal, and whenever an ignition knob or key operation is performed, the engine is ignited to start the engine. Therefore, since the engine is started only when the ID code transmitted from the transponder 27 of the electronic key 2 coincides with the vehicle 3 side, the antitheft effect corresponding to the combined key and the direct wiring connection is very high.
[0035]
The vehicle 3 is equipped with a navigation system (hereinafter referred to as a car navigation system) 36 that guides the driver to the destination, and an air bag device 37 that reduces the impact on the driver and passengers in the event of a collision. The controller 4 includes a navigation ECU 38 and an airbag ECU 39. The car navigation 36 and the airbag device 37 correspond to on-vehicle equipment, and the navigation ECU 38 and the airbag ECU 39 correspond to a control unit.
[0036]
The navigation ECU 38 operates the car navigation 36 using the battery 25 as a power source, and the airbag ECU 39 operates the airbag device 37 using the battery 25 as a power source. The navigation ECU 38 and the airbag ECU 39 execute a predetermined initial operation immediately after the power is supplied from the battery 25. The navigation ECU 38 obtains the current position of the vehicle 3 by the GPS function as the initial operation. Further, the airbag ECU 39 performs an initial self-diagnosis as an initial operation to execute a collision determination diagnosis before traveling.
[0037]
FIG. 3 is a circuit diagram showing a main part of the controller 4. The navigation ECU 38 and the airbag ECU 39 are connected to the battery 25 in parallel. Between the navigation ECU 38 and the airbag ECU 39 and the battery 25, a connection switch 40 as a switch means is interposed. The connection switch 40 is an excitation type including a contact part 41 and a coil part 42. When the coil part 42 is excited, the contact part 41 is turned on in a connected state (chain line in the figure), and the coil part 42 is turned on. Is in a non-excited state, the contact portion 41 is cut off (solid line in the figure) and turned off.
[0038]
One terminal 43 of the contact portion 41 is connected to the + side of the battery 25, and the other terminal 44 is connected to the + side of the navigation ECU 38 and the airbag ECU 39. The coil part 42 has an input side connected to the smart ECU 16 and an output side connected to the GND. When the smart ECU 16 collates the ID code transmitted from the electronic key 2, the coil unit 42 of the connection switch 40 is excited if the two codes match, and the coil unit 42 is not excited if the codes do not match. . For this reason, the connection switch 40 is turned on when the code collation by the smart ECU 16 matches, and the navigation ECU 38, the air bag ECU 39, and the battery 25 are connected.
[0039]
Here, when the smart key system 10 is operated, the connection switch 40 operates as follows. First, when the driver who owns the electronic key 2 enters the area E1, the electronic key 2 receives the request signal through the antenna 14, operates the microcomputer 11, and sends the ID code signal S from the antenna 15. _a To send. The smart ECU 16 receives the ID code signal S via the antenna 7 and the receiving circuit 18. _a And the ID code is collated with the ID code stored in the memory 19. The smart ECU 16 excites the coil portion 42 of the connection switch 40 when the received ID code matches the ID code in the memory 19.
[0040]
Then, the connection switch 40 is switched from OFF to ON, and the navigation ECU 38 and the airbag ECU 39 are energized with the battery 25. For this reason, the power supply to the navigation ECU 38 and the airbag ECU 39 is started almost simultaneously with the unlocking of the door lock of the vehicle 3. Then, immediately after the power is supplied from the battery 25, the navigation ECU 38 secures the current position by the GPS function, and the airbag ECU 39 executes an initial self-diagnosis.
[0041]
By the way, it takes several seconds to secure the current position by the navigation ECU 38 and to perform the initial self-diagnosis by the airbag ECU 39. However, before the driver gets into the vehicle 3, power is supplied to the navigation ECU 38 and the airbag ECU 39, and the navigation ECU 38 secures the current position and starts the initial self-diagnosis by the airbag ECU 39. Therefore, the navigation ECU 38 can secure the current position and the air bag ECU 39 can complete the initial self-diagnosis before the vehicle 3 starts to travel. It can be in a state.
[0042]
Therefore, in this embodiment, the following effects can be obtained.
(1) Using the keyless entry function of the smart key system 10, the door lock is unlocked when the code of the electronic key 2 matches the code of the vehicle 3, and power is supplied to the navigation ECU 38 and the airbag ECU 39. The Therefore, prior to entering the vehicle 3 before the ignition switch 24 is ignited, the navigation ECU 38 secures the current position and the air bag ECU 39 starts an initial self-diagnosis. Accordingly, since the navigation ECU 38 can secure the current position and the air bag ECU 39 can complete the initial self-diagnosis before the vehicle 3 starts traveling, the car navigation 36 and the air bag device 37 can be used at the same time as the vehicle 3 starts traveling. Can be in a state.
[0043]
(2) The timing at which the door lock is unlocked is the start timing of power supply to the navigation ECU 38 and the airbag ECU 39. Therefore, since there is sufficient time for the driver to open the door 9 and get into the vehicle 3 to start traveling, the current position is secured by the navigation ECU 38 and the initial self-diagnosis is performed by the airbag ECU 39 before the traveling is started. It can be finished almost certainly.
[0044]
(3) Since the ID code signal of the smart key system 10 transmitted from the electronic key is used to start the power supply of the navigation ECU 38 and the airbag ECU 39, a new one is required to start the power supply prior to the ignition-on state. There is no need to prepare a special radio wave.
[0045]
(4) Since the connection switch 40 uses an electromagnetic type composed of the contact part 41 and the coil part 42, the connection switch 40 can be a simple switch.
In addition, embodiment is not limited to the above, You may change to the following aspects.
[0046]
The process of supplying electric power to the navigation ECU 38 and the airbag ECU 39 before the ignition is turned on is not limited to being executed by the smart ECU 16 that operates the smart key system 10. For example, the process may be executed by the immobilizer ECU 32, and the electronic key 2 enters the area E3, and the ID code of the electronic key 2 and the ID code of the memory 35 are collated. Then, when these codes match, the immobilizer ECU 32 may start supplying power to the navigation ECU 38 and the airbag ECU 39. In this case, power supply to the navigation ECU 38 and the airbag ECU 39 prior to the ignition-on state can be started using the immobilizer system 26.
[0047]
The process of supplying electric power to the navigation ECU 38 and the airbag ECU 39 before the ignition is turned on is not limited to being executed using an ID code signal used in the smart key system 10. For example, in a configuration in which the door lock is unlocked when the unlock switch of the electronic key 2 is pressed, when the key code transmitted when the unlock switch is pressed matches the code of the vehicle 3, the navigation ECU 38 and the air Power supply to the back ECU 39 may be started.
[0048]
The timing at which power supply to the navigation ECU 38 and the airbag ECU 39 is not limited to being the same as the timing at which the door lock is unlocked. For example, power supply may be started when the driver gets into the vehicle 3 and the door 9 is closed based on an on / off signal from the signal switch 23. The timing at which the power supply is started is not particularly limited as long as the ignition switch 24 is turned on.
[0049]
The power supply to the navigation ECU 38 and the airbag ECU 39 may be started before the driver gets into the vehicle 3. For example, power supply may be started when the door 9 of the vehicle 3 is opened based on an on / off signal from the signal changeover switch 23. In this case, if the power supply is started before the driver gets into the vehicle 3, a sufficient time for completing the initial operations of the navigation ECU 38 and the airbag ECU 39 can be secured.
[0050]
The control unit is not limited to the navigation ECU 38 or the airbag ECU 39, and is not particularly limited as long as it is an ECU that controls an in-vehicle device that requires a predetermined rise time from when power is supplied until it can be used.
[0051]
The electronic key 2 is not limited to being capable of executing both the smart key system 10 and the immobilizer system 26 with a single key. For example, the portable device that operates the smart key system 10 and the ignition key that includes the transponder 27 and operates the immobilizer system 26 may be separately provided.
[0052]
The steering lock is not limited to being automatically unlocked / locked by the smart ECU 20 or the immobilizer ECU 33. For example, the key plate of the electronic key 2 may be inserted into an engine starting cylinder and manually unlocked when the keyway is rotated in alignment with the cylinder side.
[0053]
The electronic key 2 is not limited to a key-like one, and the code source is not particularly limited as long as it can transmit an ID code such as an ID transmitter or a mobile phone.
The electronic key 2 is not limited to transmitting the ID code by wireless communication, and may be one that communicates the ID code by biometric communication, for example. That is, the ID code may be transmitted to the vehicle 3 side through the human body when the driver who owns the storage body storing the ID code touches the door.
[0054]
The vehicle is not limited to an automobile (vehicle 3 in this example). For example, the vehicle may be a motorcycle, a special vehicle (such as an agricultural machine), or an industrial vehicle (such as a forklift), and the type (model) is not particularly limited.
[0055]
The technical ideas other than the claims that can be grasped from the embodiment and other examples will be described below together with the effects thereof.
(1) In Claims 1 to 3, the vehicle further comprises detection means (23) for detecting whether the driver has opened the door of the vehicle and has entered the vehicle, and the control means is based on the detection result of the detection means. Before the driver gets into the vehicle, the connection state of the switch means is switched to start supplying power to the control unit.
[0056]
(2) In Claims 1 to 3, the control means takes in a transmission signal carrying the identification code of the electronic key, and permits or disallows engine start of the vehicle based on the transmission signal. The control means permits the engine start of the vehicle and switches the connection state of the switch means to start power supply to the control unit when the codes match based on the collation result of the collation means. .
[0057]
(3) In Claims 1 to 3, the control unit performs an initial operation as a stage before the vehicle-mounted device can be used immediately after power is supplied.
(4) In Claim 1 or 2, the control means is configured to take in a transmission signal carrying the identification code of the electronic key and automatically unlock or lock the door lock of the vehicle based on the transmission signal. Then, the control means unlocks the door lock of the vehicle when the two codes match based on the collation result of the collation means, and switches the connection state of the switch means to supply power to the control unit. Start supplying. In this case, when the electronic key is carried close to the door of the vehicle, the door lock is automatically unlocked, and when it is moved away, the door is automatically locked. The control unit can be activated by starting to supply power to the unit.
[0058]
【The invention's effect】
As described above in detail, according to the present invention, since power is supplied to the control unit in advance before the operating means is in the ignition-on state, even if the vehicle is started immediately after the engine is started, It can be left in a usable state.
[Brief description of the drawings]
FIG. 1 is an electrical configuration diagram of an electronic key system according to an embodiment.
FIG. 2 is a schematic diagram showing an overall configuration of an electronic key system.
FIG. 3 is a circuit diagram showing a main part of a controller.
FIG. 4 is a circuit diagram showing an electrical configuration of a conventional vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electronic key system, 2 ... Electronic key, 3 ... Vehicle, 16 ... Smart ECU as collation means and control means, 24 ... Ignition switch as operation means, 25 ... Battery as power supply, 36 ... Car navigation as vehicle equipment , 37... Airbag device 37 as on-vehicle equipment, 38... Navigation ECU as control unit, 39... Airbag ECU as control unit, 40... Connection switch as switch means.

Claims (3)

In an electronic key system comprising a control unit for controlling an in-vehicle device, wherein power is supplied to the control unit from a power source,
Operating means operated at engine start;
Collating means for collating the identification code of the electronic key captured from the outside with the identification code registered in advance on the vehicle side;
Switch means positioned in parallel with the operating means to switch the connection state between the control unit and the power source;
When the identification code matches based on the collation result of the collating means, the power from the power source is supplied to the control unit before starting the power supply to the control unit based on the operation of the operating means. As described above, an electronic key system comprising: control means for switching the connection state of the switch means to activate the control unit. The control means switches the connection state of the switch means to the control unit at a timing when the two identification codes match based on the collation result of the collation means before the operation means is operated to the ignition-on state. 2. The electronic key system according to claim 1, wherein the power supply of the electronic key is started. The control means is configured to take a transmission signal carrying an identification code of the electronic key and unlock or lock the door lock of the vehicle based on the transmission signal,
The control means unlocks the door lock of the vehicle when the two identification codes match based on the collation result of the collation means, and switches the connection state of the switch means to supply power to the control unit. The electronic key system according to claim 1, wherein the electronic key system is started.

Images