JP4030005B2 - Immobilizer adapter and engine start system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an immobilizer adapter and an engine start system.
[0002]
[Prior art]
Some recent vehicles are equipped with a system called an immobilizer to prevent theft of the vehicle. This immobilizer has a predetermined code on the engine key and communicates with the vehicle's ECU (engine control unit) when the engine key is keyed into the key cylinder. The code held by the engine key matches the code held by the ECU. The engine is allowed to start on the condition.
[0003]
On the other hand, in an engine starter that starts an engine by remote control (remote control), an in-vehicle device that receives a signal from a slave unit starts the engine by simulating the movement of a key cylinder by an engine key. . However, even if the movement of the key cylinder is imitated, if the above code is not transmitted, the code is not confirmed in a vehicle equipped with an immobilizer. Could not be started.
[0004]
In order to solve such a problem, for example, there is an engine starter disclosed in Japanese Patent Laid-Open No. 2002-70626. According to this invention, a mode change switch is provided in the vehicle-mounted device, and the engine is actually started by operating a normal engine key in a state where the mode change switch is set to the learning mode. The in-vehicle device captures and stores the exchange of code between the immobilizer and the ECU that is performed prior to the start. And when actually starting an engine by remote operation from a subunit | mobile_unit, it carries out by switching a mode changeover switch to reproduction | regeneration mode. In other words, when an instruction to start the engine from the slave unit is received in the regeneration mode, the vehicle-mounted device transmits the code recorded in the learning mode to the ECU side and receives permission to start the engine. Is executed to start the engine.
[0005]
[Problems to be solved by the invention]
This type of engine starting device is sold afterward on a vehicle by a dealer, an electrical equipment store, or the like, and if it is described above, ID registration to the engine starting device is performed after wiring is completed. Then, since the in-vehicle device of the engine starter is usually placed in an inconspicuous place, it is not easy to operate the mode switch to change to the learning mode when learning, and then set it again to the playback mode. There wasn't.
[0006]
Furthermore, when the user loses the engine key, the code is also changed, but in such a case, a registration operation is required. Then, there is a problem that it is troublesome because it is necessary to update the code at a dealer or an electrical equipment store.
[0007]
The present invention has been made in view of the above-described background, and the object of the present invention is to prepare for the registration of a code after wiring, and when the user changes the code when the engine key is lost, etc. It is an object of the present invention to provide an immobilizer adapter and an engine start system that enable easy and accurate registration.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, an immobilizer adapter according to the present invention acquires the code transmitted from an engine key provided with a predetermined code, and sends the acquired code to a vehicle ECU, and It is an immobilizer adapter mounted on a vehicle equipped with an anti-theft system equipped with the vehicle ECU that permits the start of the engine on condition that the code sent from the immobilizer is valid. A temporary storage means for temporarily storing a code that is branched and attached to a wiring between the immobilizer and the vehicle ECU, and that has acquired the code output from the immobilizer toward the vehicle ECU; and the temporary storage A learning function for storing the generated code in a code storage means as a pseudo code under certain conditions, and a start command from a remote engine starter body (corresponding to “engine starter 20” in the embodiment) A function of sending the pseudo code stored in the code storage means to the vehicle ECU;Assuming that
  In the premise immobilizer adapter, a signal based on the code stored in the code storage means is sent to the engine starter body, a response based on the signal is received from the engine starter body, and the response is correct. A function of executing a process of sending the pseudo code to the vehicle ECU;Is provided.
Further, as another solution, in the premise immobilizer adapter, when storing both the previously stored pseudo code and the acquired new pseudo code, and sending the pseudo code to the vehicle ECU, A function is provided for outputting the latest pseudo code, and outputting the pseudo code stored before that when there is a request from the vehicle ECU even if it is output a predetermined number of times. And it is good to provide both these functions.
[0009]
For example, in a state where a code (pseudo code) is not stored, such as when an immobilizer adapter is newly installed, when the engine is started using a regular engine key, the immobilizer is sent to the vehicle ECU at that time. The code is acquired, temporarily stored, and the temporarily stored code is stored in the code storage means as a pseudo code. Therefore, when the engine is started using the engine start device by remote operation without using the engine key after that, the pseudo code stored in the immobilizer adapter is sent to the vehicle ECU in accordance with a command from the engine start device body. . As a result, the vehicular ECU that has received the pseudo code output instead of the immobilizer issues an engine start permission, so that the engine can be started from the engine starter body.
[0010]
Further, if the engine key is lost or the like, the engine key is switched to a new engine key. However, since the new engine key naturally has a different code, the immobilizer adapter also needs to store a new code. Therefore, when the engine is started using a new engine key, a new engine key code is sent from the immobilizer prior to the starting process, so the immobilizer adapter temporarily stores the code output from the immobilizer. When the code temporarily stored satisfies a certain condition, the code temporarily stored temporarily is registered in the code storage means as a pseudo code. As a result, the engine starting device can be started by using the newly registered pseudo code. Then, the pseudo code update registration is automatically performed in the immobilizer adapter in accordance with an action normally performed by the user, such as engine start by the engine key.
[0011]
In addition, there is a possibility that an operation is performed using an incorrect engine key, or an illegal code is temporarily stored due to various other causes. However, such a non-normal code is generated once and a normal code is output from the immobilizer when a normal start with a correct engine key is performed.
[0012]
Therefore, even if an incorrect code is mistakenly registered in the code storage means, it is restored to the correct code on the basis of the subsequent correct engine start, and after that, the pseudo code output from the immobilizer adapter is restored. Based on this, an engine start permission is issued from the vehicle ECU.
[0013]
Usually, the immobilizer adapter is installed in a place that cannot be easily seen by the driver or the like in the back of the vehicle, so it is practically difficult for the user to give a command to the immobilizer adapter by manual operation. However, in the present invention, the normal code is automatically learned based on the engine start action by the engine key, and the code (pseudo code) that detects and stores the normal code is also updated when the normal code is changed. Can also be done automatically. Therefore, operability is improved.
[0014]
  In addition,Retains both previously stored pseudocode and new pseudocodeLikeWhen sending the pseudo code to the vehicle ECU, the latest pseudo code is output first, and even if it is output a predetermined number of times (including once), if there is a request from the vehicle ECU, the pseudo code stored last time is incorrect Because it was configured to output the pseudo code stored before thatWhen the new pseudo code is wrong, it is no longer possible to start the engine based on the engine starting device until the new pseudo code is restored.In this case, if the start permission is issued based on the pseudo code stored before that, the pseudo code stored last time may be determined to be erroneous registration and may be deleted.
[0015]
It is of course possible to eliminate such erroneous registration by appropriately setting certain conditions for registration. Various conditions can be set as the fixed condition. For example, the learning function stores the temporarily stored code as a pseudo code in the code storage means when the same code is acquired a predetermined number of times. You can The predetermined number includes one time, and the possibility of erroneous registration decreases as the number increases.
[0016]
Further, the learning function determines whether or not a pseudo code is registered in the code storage means, and outputs the output from the immobilizer according to a request from the vehicle ECU when the pseudo code is not registered. It is also possible to store the code to be stored in the code storage means.
[0017]
If the pseudo code is not stored, it can be assumed that it is newly installed.In such a case, after installing the immobilizer adapter, etc., use the engine key to check whether the anti-theft system including the immobilizer operates normally. Often done. Therefore, if a code is output from the immobilizer in an unregistered state, it can be presumed that the inspection is performed, and there are many cases where the code is correct. Therefore, a regular code can be registered by acquiring the code and temporarily storing the code temporarily stored in the code storage means.
[0018]
Further, the learning function determines whether or not a pseudo code is registered in the code storage means, and when the pseudo code is already registered in the code storage means, the immobilizer is in accordance with a request from the vehicle ECU. It is also possible to monitor the code output from, and register the code in the code storage means when the same code is output a plurality of times.
[0019]
That is, when switching to a new engine key as described above, since the code of the new engine key is naturally different, the immobilizer adapter also needs to store a new code. Therefore, each time the engine is started using a new engine key, the immobilizer adapter temporarily stores the code output from the immobilizer. When the code temporarily stored matches the predetermined number of times, it is determined that the code has been changed, and the code temporarily stored in the code storage means is automatically registered as a pseudo code. As a result, the engine starting device can be started by using the newly registered pseudo code. Then, the pseudo code update registration is automatically performed in the immobilizer adapter in accordance with an action normally performed by the user, such as engine start by the engine key.
[0020]
In addition, there is a possibility that an operation is performed using an incorrect engine key, or an illegal code is temporarily stored due to various other causes. However, since such a non-regular code is generated once, the same code is rarely output a plurality of times, so that erroneous registration can be prevented.
[0021]
Similarly, the learning function determines whether or not a pseudo code is registered in the code storage unit. When the pseudo code is already registered in the code storage unit, the learning function is performed according to a request from the vehicle ECU. The code output from the immobilizer may be monitored, and the code may be registered in the code storage unit when a code different from the registered pseudo code is output a plurality of times. In this way, in addition to the above-described effects, useless processing such as re-registering already registered codes can be eliminated.
[0022]
Preferably, the learning function is configured such that after the code is temporarily stored in the temporary storage unit, the code temporarily stored when there is no code transmission request from the vehicle ECU toward the immobilizer is a normal code. It is determined and registered in the code storage means based on the regular code.
[0023]
The fact that there is a transmission request means that the code sent from the immobilizer last time to the vehicle ECU could not be recognized as a proper one. Therefore, when there is no transmission request, it can be estimated that the code acquired and temporarily stored last time is a regular one. If the transmission request is issued repeatedly, it can be predicted that the wrong engine key has been inserted or that there is an abnormality on the anti-theft system side, so there is no reliability with the temporarily stored code. Therefore, in this case, it is preferable to end the current learning.
[0024]
Further, the learning function registers the code in the code storage means on the condition that a code different from the registered pseudo code is output a predetermined number of times within a certain time limit. It can also be.
[0025]
Furthermore, power supply to the immobilizer is performed via the immobilizer adapter, and when the pseudo code stored in the code storage means is sent to the vehicle ECU, the power to the immobilizer is supplied. It is even better to stop the supply. With such a configuration, when a code (pseudo code) is output from the immobilizer adapter, erroneous transmission from the immobilizer can be prevented.
[0026]
Further, a signal based on the code stored in the code storage means is sent to the engine starter main body, a response based on the signal is received from the engine starter main body, and the pseudo code is obtained on condition that the response is correct. It is good to perform the process which sends to the said ECU for vehicles.
[0027]
If only the immobilizer adapter is attached and the code (pseudo code) is output based on some wrong trigger, the engine can be started. Therefore, a regular engine starter main body is attached, and it is necessary to output a pseudo code held when a start command is received from the engine starter main body. In this case, the immobilizer adapter and the engine starter main body are reminded of the ID code and the like, and the ID code can be exchanged to recognize that it is legitimate. However, when doing so, it is necessary to store and hold the ID code, and a different ID code is assigned to each immobilizer adapter, which is complicated. Therefore, as in the present invention, if the legitimate engine starter body is recognized using the stored pseudo code, it is not necessary to store the ID code for recognition in advance. In addition, a memory for storage is not necessary, which is preferable. Moreover, since the pseudo code has a different value for each anti-theft system, the same effect as that obtained by giving a different ID code can be obtained.
[0028]
Of course, in the present invention, it is not always necessary to adopt such a configuration, and a recognition ID code may be stored and held separately, or a recognition ID code or the like may not be provided.
[0029]
An engine start system that enables engine start by remote control according to the present invention includes the above-described immobilizer adapters, the engine starter body connected to the immobilizer adapters, and wireless communication with the engine starter body. And a slave unit for sending commands.
[0030]
In addition, although the immobilizer adapter in each above-mentioned invention has shown the example comprised as an engine starter main body and another member in embodiment, it may be made to provide integrally.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of a general vehicle-side system configuration in which an immobilizer to which the present invention is applied is mounted. As shown in FIG. 1, an antenna 2a is built in a key cylinder 2 into which an engine key 1 storing a predetermined code is inserted. The engine key 1 inserted into the key cylinder 2 generates power using electromagnetic waves (134.2 kHz) emitted from the antenna 2a, and the engine key 1 stores a code stored by the stored electricity. The transmission is performed by the transmitter.
[0032]
On the other hand, when the engine key 1 is inserted, the key cylinder 2 performs key detection by a key-in detection switch (not shown). Various signals (ST / ACC / IG / key-in signal) accompanying the operation of the engine key 1 are sent from the key cylinder 2 to the ECU (electric control unit: electronic control unit) 4. When key detection is performed, the key-in signal is turned ON. Further, as the position is changed by turning the inserted engine key 1, the signals of accessory (ACC) → ignition (IG) → starter (ST) are output.
[0033]
Therefore, the ECU 4 detects the key-in signal or confirms the detection of IG, supplies power to the immobilizer 3 (VC5), and issues a code transmission request (TXCT). The TXCT signal, which is a code transmission request, is actually controlled to transmit an electromagnetic wave from the antenna 2a to the engine key 1, and the immobilizer 3 receives the TXCT signal (50 msec) while receiving the antenna 2a. Allow transmission of electromagnetic waves from.
[0034]
As a result, the engine key 1 generates power while the TXCT signal is transmitted from the ECU 4. When the power is stored by the power generation unit of the engine key 1, the engine key 1 transmits a predetermined code by an electromagnetic wave by the transmitter after the TXCT signal ends.
[0035]
When receiving the code signal from the engine key 1, the immobilizer 3 sends (CODE) the received code to the ECU 4 in synchronization with the reception synchronization clock (RXCK). Then, the ECU 4 permits the engine to start if the received codes match. Normally, the engine key 1 does not have a battery and the power that can be used for power storage by electromagnetic waves is limited. Therefore, the electromagnetic wave transmission output is small and the code of the immobilizer 3 is normally taken in when the engine key 1 is not inserted. If the codes do not match, the TXCT signal is sent again to re-send the code. Thereby, ECU4 can transmit the code | symbol which an engine key has to ECU4 reliably.
[0036]
FIG. 2 shows an embodiment of the present invention. In FIG. 2, for convenience of illustration, the key cylinder 2 is not shown. However, the key cylinder 2 is installed similarly to the example shown in FIG. 1, and a predetermined signal is sent to the ECU 4 according to the position of the inserted engine key. A predetermined electromagnetic wave is emitted from the built-in antenna.
[0037]
Here, in the present invention, first, the immobilizer adapter 10 is provided by branching from the wiring between the immobilizer 3 and the ECU 4. The immobilizer adapter 10 branches from the wiring between the immobilizer 3 and the ECU 4 and takes in various signals or sends predetermined signals. In other words, a code transmitted between the immobilizer 3 and the ECU 4 is acquired, and the acquired code is stored in the memory 12 as a pseudo code that replaces the normal code as necessary. When a start command is received from the engine starter 20, Instead of the immobilizer 3, the pseudo code stored in the memory 12 is sent to the ECU 4, and when the start permission is received, a normal engine start device 20 starts a starting process. Further, the code (pseudo code) is stored in the memory 12 by monitoring a signal for transmitting and receiving the wiring between the immobilizer 3 and the ECU 4 to determine whether or not the current learning should be performed, and the user operates a normal engine key. When a process for starting the engine is performed, a code is automatically acquired and stored in the memory 12. As a result, the user can set the learning mode by operating the mode change switch in order to memorize the code as in the past, or manually operate the mode change switch again after returning to the playback mode. The complicated switching process by operation becomes unnecessary. Note that the memory 12 is preferably a non-volatile memory such as an EEPROM, for example, because the power of the immobilizer adapter 10 can be turned off.
[0038]
A specific configuration for realizing such a function is as follows. First, immobilizer adapter 10 is provided with each terminal branched and connected to wiring between immobilizer 3 -ECU4. That is, the TXCTin terminal is used to capture a TXCT signal at the time of code registration or reproduction, and is connected in a branched state to a wiring connecting the TXCT terminals of the immobilizer 3 and the ECU 4.
[0039]
The CODEout terminal is an output terminal for sending a pseudo code to the ECU 4 during code reproduction. The immobilizer 3 and the ECU 4 are connected in a branched state to the wiring connecting the CODE terminals of the ECU 4, and give pseudo code to the CODR terminal of the ECU 4 at a predetermined timing. The RxCKout terminal is a synchronous clock for transmitting pseudo code from the CODEout terminal. The immobilizer 3 and the ECU 4 are connected in a branched state to the wiring connecting the RxCK terminals.
[0040]
The CODEin terminal and the RxCKin terminal are used for taking in a code output from the immobilizer 3 at the time of code registration, and the CODEin terminal is connected in a branched state to wiring connecting the CODE terminals of the immobilizer 3 and the ECU 4. That is, it is connected in parallel with the CODEout terminal. The code transmitted from the CODE terminal of the immobilizer 3 to the CODE terminal of the ECU 4 is also taken into the CODEin terminal. The RxCKin terminal is a synchronous clock when a code is taken into the CODEin terminal. The immobilizer 3 and the ECU 4 are connected in a branched state to the wiring connecting the RxCK terminals.
[0041]
The VC5in terminal is used to capture a VC5 signal from the ECU 4, and is inserted and arranged in series in a wiring connecting the immobilizer 3 and the VC5 terminals of the ECU 4. Further, a normally closed relay 11 is inserted in the internal wiring of the VC5in terminal, and the opening and closing of the relay 11 is controlled by the ImbRY signal. Therefore, when the relay 11 is closed, the immobilizer 3 and the VC5 terminal of the ECU 4 are in a conducting state, and when the relay 11 is opened, the non-conducting state is established.
[0042]
When the code (pseudo code) is registered, the VC5 signal is passed as it is, and at the time of reproduction, the immobilizer adapter 10 operates to replace the immobilizer 3, so that the relay 11 is not opened and the immobilizer 3 is not operated. I have to. The ImbRY signal causes the normally-closed relay 11 to be opened during reproduction in order to perform the above-described operation.
[0043]
The immobilizer adapter 10 is normally turned off, and starts its own power supply upon detection of VC5 input to the VC5in terminal. The immobilizer adapter 10 also has a function of turning off the immobilizer adapter after receiving and storing the code from the immobilizer based on the generation of the TXCT signal.
[0044]
The GND terminal is a vehicle ground, and the power from the vehicle battery is always supplied to the + B terminal. That is, it can be said that both the GND terminal and the + B terminal constitute a power supply terminal.
[0045]
The SCOM terminal and the SCK terminal are used to transmit and receive engine starter 20 data. The SCOM terminal is a terminal that performs bidirectional communication between the immobilizer adapter 10 and the engine starter 20, and the SCK terminal synchronizes SCOM communication. It is a clock for.
[0046]
And the signal transmitted / received via each above-mentioned terminal is controlled by CPU13. The CPU 13 also reads and writes codes (pseudo code) from and to the memory 12. The CPU 13 has a function of executing the flowcharts in FIG. Note that “START” in FIG. 3 indicates an operation start after the immobilizer adapter 10 is attached.
[0047]
First, the key-in counter that counts the number of key-ins with the operation of the immobilizer adapter 10 is cleared (ST1). Actually, it is initialized by a cold start of the CPU.
[0048]
Next, the ECU 4 waits for the power supply VC5 from the ECU 4 to the immobilizer adapter 10 (ST2). That is, as described above, when an engine key (see reference numeral 1 in FIG. 1) is inserted into the key cylinder 2, the key-in signal of the key cylinder 2 is turned on and transmitted to the ECU 4. The ECU 4 receives the key-in signal, outputs VC5, and sends out a TXCT signal. Therefore, detection of VC5 indicates that key-in has been performed or that a pseudo IG output has been performed by the engine starter 20. Since the relay 11 is a normally closed contact, the VC5 signal output from the ECU 4 is input to the VC5 terminal of the immobilizer 3 via the immobilizer adapter 10. Thereby, the immobilizer 3 performs normal processing.
[0049]
On the other hand, if VC5 is detected (Yes in step 2), a TX counter for counting the number of receptions of the TXCT signal is initialized (ST3). The TX counter may be realized by a software counter by the CPU 13 or may be realized by providing a separate counter.
[0050]
Then, it is determined whether or not any code is stored in the memory 12 (ST4). If no code is stored, it is necessary to register a new code, so the process proceeds to the initial registration mode (ST8). If the code has already been registered in the memory 12, the CPU 13 of the immobilizer adapter 10 further confirms the presence or absence of the SCK signal from the engine starting device 20 (ST5), and if there is no SCK signal, the update registration mode (ST6). ), And if it exists, the playback mode (ST7) is entered.
[0051]
That is, if there is an input of the SCK signal, the pseudo code stored in the memory 12 is reproduced and sent to the ECU 4 to issue the start permission command from the ECU 4 in order to start the engine using the engine starter 20. Wait for playback mode. On the other hand, when there is no SCK signal, there is a possibility that the engine is started using a normal engine key. Therefore, the wiring between the immobilizer 3 and the ECU 4 is monitored, and the code registered in the regular engine key is related. When the transmission of the wiring is acquired and the normal code is changed, the code is stored in the memory 12 (update registration mode). Accordingly, even when the code is changed, it is automatically dealt with, and after that, in the engine starting process using the engine starting device 20, the engine starting permission is obtained from the ECU 4 using the changed code. . When each mode ends, the process returns to step 2 to prepare for the next process.
[0052]
Next, a specific processing algorithm in each mode will be described. In the initial registration mode in step 8, the flowchart shown in FIG. 4 is actually executed. First, the function of this initial registration mode will be described. When the code is not registered, communication with the engine starter 20 is not performed, and the code generated following the generation of the TXCT signal is stored.
[0053]
That is, when the code is not registered, it is usually immediately after the immobilizer adapter 10 is attached, and of course it is assumed that the regular engine key 1 is used, so that the code received upon receipt of the TXCT signal is stored as it is. did. With such a configuration, the worker who normally attached the immobilizer adapter 10 performs the start with the engine key 1 in order to confirm the trouble to the vehicle due to the attachment, and at that time, the immobilizer adapter 10 stores the code. The operator can perform code registration in a natural flow without any particular awareness.
[0054]
Specifically, first, the reception of the TXCT signal is awaited (ST11). If received, the TX counter is incremented (ST12), and it is determined whether or not the value of the TX counter has become 6 (ST13). If it is less than 6, the acquired code sent from the immobilizer 3 to the ECU 4 is temporarily stored (ST14).
[0055]
Note that the code output from the immobilizer 3 is transmitted after the TXCT signal is completed. Therefore, in order for the immobilizer adapter 10 to capture the code, the code transmitted on the wiring may be temporarily stored for a predetermined time that the transmission of the code will end from the end of the TXCT signal, or the TXCT signal It is possible to follow the change of the code after the end and determine the code from the state of the code change up to that time and temporarily store it when there is no change for a predetermined time. Since there is no code registration in the initial registration mode, the code registration memory 12 can be used as a temporary storage memory.
[0056]
On the other hand, when the ECU 4 receives the code and does not receive an appropriate code due to a transmission error or the like, it sends the TXCT signal to the immobilizer 3 again to request the code. Therefore, the TX counter of the immobilizer adapter 10 counts the number of requests, and when the value of the TX counter becomes 6 (YES in the branch determination in step 13), an incorrect key is inserted or is inappropriate. The initial registration mode is terminated.
[0057]
In addition, as described above, the TXCT signal is output with key-in, and then is output again when the code cannot be normally received with the engine key inserted. Therefore, when the TXCT signal is output again, the TXCT signal is output within a predetermined time t1 (for example, 500 msec).
[0058]
If the TXCT signal cannot be detected, the branch determination at step 11 is NO and the process proceeds to step 15. However, if the period during which the TXCT signal is not received is within the predetermined time t1 (500 msec), the branch at step 15 is performed. The determination is NO, and the process returns to step 11 to detect the TXCT signal again. That is, while the TXCT signal is generated within the predetermined time t1, it is determined that a code retransmission request is issued while the engine key 1 is still inserted. If the time equal to or longer than t1 has elapsed (YES in the branch determination in step 15), the counter value of the TX counter is acquired, and it is determined whether it is greater than 0 (ST16). If it is greater than 0, the code temporarily stored as having been received by the ECU 4 is registered in the memory 12 as a normal code (ST17). In addition, when the TX counter is 0, it means that temporary storage could not be performed because the code was never sent or improper wiring was performed. Exit.
[0059]
In addition, the playback mode of step 7 is actually implemented by the flowchart shown in FIG. First, the function of this playback mode will be described as follows. The engine starter 20 normally receives a start command from a slave unit (not shown), supplies IG and ACC to the vehicle, and tries to start the engine. Therefore, the immobilizer adapter 10 sends a code to the ECU 4 instead of the immobilizer 3 in order to obtain a start permission from the ECU 4 prior to the engine start process.
[0060]
In other words, when communication (SCOM) performed in synchronization with the serial communication clock (SCK) is established, a TXCT signal is output from the ECU 4 when the IG is turned on. Therefore, a code (pseudo) stored in the memory 12 based on the TXCT signal is output. Code) is sent to the ECU 4.
[0061]
Specifically, it is determined whether communication is established with engine starter 20 (ST21). That is, first, the ECU 4 outputs VC5 by the IG output generated from the engine starter 20. Then, the immobilizer adapter 10 receives the VC 5 and turns on the immobilizer adapter 10 itself.
[0062]
And the communication by SCOM performed with the engine starting apparatus 20 is performed after the immobilizer adapter 10 confirms that SCK (communication synchronous clock) from the engine starting apparatus 20 exists. When the SCK exists, the immobilizer adapter 10 transmits a signal (security code) based on the code stored in the memory 12 to the engine starter 20. In response to this, the engine starting device 20 is configured to return the received security code converted by a predetermined calculation to the immobilizer adapter 10. As described above, in the present embodiment, the security code is originally generated using the code (pseudo code) used for obtaining the engine start permission. Therefore, the security code that is different for each immobilizer adapter 10 at the time of factory shipment. Can be given a unique security code without being stored in the immobilizer adapter 10 and the engine starting device 20.
[0063]
If the security code returned from the engine starter 20 is converted by a predetermined calculation, the immobilizer adapter 10 establishes communication with the engine starter 20 (by branching determination in step 21). YES), the operation is performed as an engine start instruction from the corresponding regular engine starter 20. By doing in this way, starting of an engine can be permitted as a result of communication with the engine starting device 20.
[0064]
Then, after the communication with the engine starter 20 is established, the immobilizer adapter 10 controls the relay 11 by the ImbRY signal to open the contact, shuts off the supply of the power source (VC5) to the immobilizer 3, and the immobilizer 3 The generation of a signal from is prohibited and malfunction is prevented.
[0065]
If communication is not established, the determination at step 21 is NO, so the process is terminated. The reason for adopting such a configuration is to suppress a decrease in security due to the immobilizer adapter 10 outputting a code in a state where the regular engine starter 20 is not attached.
[0066]
On the other hand, when communication is established, the engine starting device is instructed to start the engine, a timer is started, and a request for a TXCT signal from the ECU 4 is waited (ST22, ST23). When the TXCT signal is detected, the code (pseudo code) stored in the memory is transmitted to the ECU 4 (ST24). That is, the immobilizer adapter 10 receives the TXCT signal from the ECU 4 and sends RxCK and CODE to the ECU. That is, the ON / OFF of the switching element Q1 is controlled by the RxCKout signal (predetermined pulse signal), a desired clock is supplied to the RxCK terminal of the ECU 4, and the switching element Q2 is turned ON / OFF by the CODEout signal (predetermined pulse signal). Is generated, and a code (pseudo code) stored in the memory 12 is generated and applied to the CODE terminal of the ECU 4. As a result, the ECU 4 determines that the regular code has been transmitted from the immobilizer 3, and permits the engine to start.
[0067]
The engine starter 20 sets SCOM to L when engine start is confirmed. Accordingly, the immobilizer adapter 10 ends the playback mode when the SCOM becomes L or the timer for preventing a loop in the playback mode exceeds a predetermined time t2 for some reason (ST25, ST26). . If both branch determinations in steps 25 and 26 are NO, the process returns to step 23 to repeat the transmission of the code by detecting the TXCT signal.
[0068]
When the detection of the TXCT signal is not performed for t1 seconds (YES in step 27), it is determined that the ECU 4 has accepted the code and issued a start permission, and the regeneration mode is terminated. At this time, the immobilizer adapter 10 notifies the engine starter 20 to that effect, and the engine starter 20 drives the engine starter motor (starter) for a predetermined time.
[0069]
In this embodiment, the immobilizer adapter 10 or the engine starter 20 is notified that the regeneration mode has been completed, and the engine starter 20 drives (turns) the starter as a trigger. As a configuration, for example, the engine starter 20 may rotate the starter after a predetermined time from outputting the pseudo ACC signal regardless of the state of the immobilizer adapter 10.
[0070]
The update registration mode in step 6 actually implements the flowchart shown in FIG. First, the function of the update registration mode will be described as follows. That is, this mode is a case where a code has already been registered. When the initial registration mode is operated in such a state where the code is registered in this way, the code is registered every time the driver enters the engine key 1. It will be corrected.
[0071]
In this way, when the driver registers the code held by the engine key 1 every time he / she plugs in / out the engine key 1, the normal code can be expected to be generated and registered under normal specifications. There is a risk that an incorrect code will be registered due to some reason such as unnecessarily inserting or removing the engine key. If an incorrect code is registered in this way, the engine cannot be started by the engine starter 20 thereafter.
[0072]
This is because the ECU 4 repeatedly generates the TXCT signal until the legitimate code is received when the code transmission error or the engine key 1 is different. Therefore, the immobilizer adapter 10 in the initial registration mode generates a TXCT signal generated within a predetermined time. Temporarily store the following code. When the TXCT signal is received a predetermined number of times, the registration operation is stopped as an error. This is because if the engine key is removed during such an operation, the TXCT signal is not output, and an incorrect code may be registered.
[0073]
For this reason, when the code has already been registered, if the codes obtained by inserting and removing the engine key continuously for a predetermined number of times are all the same, it is recorded that the correct code has been received. By adopting such a configuration, even when the code is changed due to loss of the key or the like, a new code can be registered by simply inserting and removing the key a predetermined number of times.
[0074]
Further, a predetermined time limit may or may not be provided for the interval between insertion and removal of the engine key. If the time limit is not provided, the driver can update the code without being particularly conscious. That is, a new engine key code is automatically registered in the immobilizer adapter by simply starting the engine normally using the new engine key 1 a predetermined number of times. In addition, when a predetermined time limit is provided, it is possible to make the specification that consciously updates the code. Therefore, a more suitable specification can be selected according to customer needs.
[0075]
In the present embodiment, there is no time limit and the predetermined number of times is three. A key-in counter is provided to count the predetermined number of times, that is, the number of engine key insertions. This key-in counter is incremented with the presence of a key-in (with an engine key inserted) on condition that the TXCT signal is detected and the code is normally delivered.
[0076]
Key-in is repeated a predetermined number of times (three times), and if all received codes match and are not identical to the already stored codes, the code is rewritten (registered). Also, when the received code is the same as the stored code, or the code that has not received the same code continuously is not registered. Further, when the TXCT signal is output again from the ECU within a predetermined time after the code is detected, it can be said that the code is a transmission error or the code is not registered in the ECU. Therefore, if the TXCT signal is detected a predetermined number of times within a predetermined time, it is regarded as an error and the code is not updated. Then, after the key-in, the update registration mode is terminated after completion of the series of processes described above.
[0077]
As a specific algorithm for executing the above-described processing, first, reception of a TXCT signal is awaited (ST31). If received, the TX counter is incremented (ST32), and it is determined whether or not the value of the TX counter has become 6 (ST33). If it is less than 6, the code sent from the immobilizer 3 to the ECU 4 is temporarily stored (ST34). That is, the received code is temporarily stored when the TXCT signal is generated when there is no communication with the engine starter 20 (no SCK is generated). The code that comes after the TXCT signal transmission is temporarily stored until the TX counter reaches 6.
[0078]
If the TXCT signal cannot be detected, the branch determination in step 31 is NO and the process proceeds to step 35. However, if the period during which the TXCT signal is not received is within the predetermined time t1 (500 msec), the branch of step 35 is performed. The determination is NO, and the process returns to step 31 to detect the TXCT signal again. That is, while the TXCT signal is generated within the predetermined time t1, it is determined that a code retransmission request is issued while the engine key 1 is still inserted. The processing procedure is the same as that for initial registration.
[0079]
If the time equal to or longer than t1 has elapsed (YES in the branch determination in step 35), it is determined whether or not the temporarily stored code is new, assuming that the code has been normally received by the ECU 4 ( ST36). If the code has already been registered and is not new, there is no need to register again, so the key-in counter is initialized and the update registration mode is terminated (ST43).
[0080]
If the code is new, the key-in counter is incremented (ST37), and it is determined whether or not the key-in counter is 1 (ST38). When the key-in counter is 1, since it is the first temporary storage code, the temporary storage code (temporary storage code) is stored as a comparison code and the update registration mode is terminated (ST39).
[0081]
If the key-in counter is not 1, the temporary storage code and the comparison code are compared (ST40), and if they are equal, it is determined that they are the same as those received at the previous key-in. If it is the same as the code received last time, it is determined whether or not the key-in counter is 3 (the same code was received three times in succession) (ST41), and the key-in counter is 3. If not, the registration update mode is terminated.
[0082]
On the other hand, if the branch determination in step 40 is NO, that is, if the temporary storage code and the comparison code are different, the condition that the same code is received continuously for a predetermined number of times (three times) is not satisfied, so the key-in counter is The update registration mode is terminated after initialization (ST43).
[0083]
Furthermore, if the branch determination in step 41 is YES, that is, if the key-in counter is 3, the temporary storage code is regarded as a regular code (pseudo code) and the code registration process for the memory 12 is performed (ST42). Thereafter, the key-in counter is initialized in preparation for the next update registration process, and the update registration mode is terminated (ST43).
[0084]
In the above-described embodiment, the comparison code is provided. However, it is also possible to store and hold all the temporary storage codes for a predetermined number of times and compare the differences. In addition, as in the above-described embodiment, a normal code is used when N codes (M> N) of codes that have been acquired and temporarily stored M times do not match N times consecutively. It may be determined and updated. That is, the predetermined number of times is not necessarily required to be continuous. Of course, it is possible to prevent the code (pseudo code) from being updated by mistake under the condition that it is continuous.
[0085]
【The invention's effect】
According to the present invention, a code can be automatically registered in the immobilizer adapter in accordance with the engine start operation by the engine key, the code can be easily registered after wiring, and the user has lost the engine key. This makes it possible to register the code easily and accurately even when the code is changed. Therefore, the immobilizer adapter can be installed in a place where it is difficult to reach, and it is difficult for the immobilizer adapter to be tampered with.For example, a person other than the user alters the immobilizer adapter to generate a code. It is possible to prevent the engine from being in a startable state, and safety is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a vehicle-side system equipped with an immobilizer.
FIG. 2 is a diagram showing a preferred embodiment of the present invention.
FIG. 3 is a flowchart showing processing functions of the CPU of the immobilizer adapter.
FIG. 4 is a flowchart showing an algorithm of an initial registration mode.
FIG. 5 is a flowchart showing an algorithm of a reproduction mode.
FIG. 6 is a flowchart showing an algorithm of an update registration mode.
[Explanation of symbols]
1 Engine key
2 Key cylinder
2a antenna
3 Immobilizer
4 ECU
10 Immobilizer adapter
11 Relay
12 memory
13 CPU
20 Engine starter

Claims (10)

An immobilizer that acquires the code transmitted from an engine key having a predetermined code and sends the acquired code to the vehicle ECU;
An immobilizer adapter that is mounted on a vehicle equipped with an anti-theft system equipped with the vehicle ECU that permits the engine to start on condition that the code sent from the immobilizer is valid,
Temporary storage means for temporarily storing a code that is branched and attached to the wiring between the immobilizer and the vehicle ECU, and that acquires the code output from the immobilizer toward the vehicle ECU;
A learning function for storing the temporarily stored code in the code storage means as a pseudo code under a certain condition;
A function of receiving a start command from a remote engine starter body and sending the pseudo code stored in the code storage means to the vehicle ECU;
A signal based on the code stored in the code storage means is sent to the engine starter main body, a response based on the signal is received from the engine starter main body, and the pseudo code is supplied to the vehicle on condition that the response is correct A function of executing processing to be sent to the ECU for use;
Immobilizer adapter, characterized by comprising. An immobilizer that acquires the code transmitted from an engine key having a predetermined code and sends the acquired code to the vehicle ECU;
An immobilizer adapter that is mounted on a vehicle equipped with an anti-theft system equipped with the vehicle ECU that permits the engine to start on condition that the code sent from the immobilizer is valid,
Temporary storage means for temporarily storing a code that is branched and attached to the wiring between the immobilizer and the vehicle ECU, and that acquires the code output from the immobilizer toward the vehicle ECU;
A learning function for storing the temporarily stored code in the code storage means as a pseudo code under a certain condition;
A function of receiving a start command from a remote engine starter body and sending the pseudo code stored in the code storage means to the vehicle ECU;
Both the previously stored pseudo code and the acquired new pseudo code are stored and stored, and when sending the pseudo code to the vehicle ECU, the latest pseudo code is first output, When there is a request from the vehicle ECU, a function to output pseudo code stored before that,
Immobilizer adapter, characterized by comprising. 3. The immobilizer adapter according to claim 2, wherein when the start permission is issued based on the pseudo code stored before that, the previously stored pseudo code is deleted . A signal based on the code stored in the code storage means is sent to the engine starter main body, a response based on the signal is received from the engine starter main body, and the pseudo code is supplied to the vehicle on condition that the response is correct The immobilizer adapter according to claim 2 or 3, further comprising a function of executing processing to be sent to the ECU . The learning function determines whether or not a pseudo code is registered in the code storage unit;
When the pseudo code has been registered in the code storage means, the code output from the immobilizer is monitored according to a request from the vehicle ECU, and the code is output when the same code is output a plurality of times. The immobilizer adapter according to any one of claims 1 to 4, wherein the immobilizer adapter is registered in the code storage unit. The learning function determines whether or not a pseudo code is registered in the code storage unit;
When the pseudo code is already registered in the code storage means, the code output from the immobilizer is monitored according to a request from the vehicle ECU, and a code different from the registered pseudo code is output a plurality of times. The immobilizer adapter according to any one of claims 1 to 4, wherein the code is registered in the code storage means. The learning function, after temporarily storing the code in the temporary storage means, determines that the code temporarily stored when there is no code transmission request from the vehicle ECU toward the immobilizer is a regular code,
The immobilizer adapter according to any one of claims 1 to 6, wherein the immobilizer adapter is registered in the code storage unit based on the regular code. 7. The immobilizer according to claim 5, wherein the code is registered in the code storage means on condition that the plurality of times of output is generated within a predetermined time limit. adapter. The power supply to the immobilizer is performed through the immobilizer adapter,
The power supply to the immobilizer is stopped when the pseudo code stored in the code storage means is sent to the vehicle ECU. Immobilizer adapter as described in the section. The immobilizer adapter according to any one of claims 1 to 9,
The engine starter body connected to the immobilizer adapter;
An engine start system comprising: a slave unit that transmits a command to the engine starter body by wireless communication.

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