JP4830737B2 - Vehicle engine start system - Google Patents

Description

  The present invention relates to a vehicle engine starting system.

In recent years, in order to prevent a vehicle from being stolen and illegally used, an engine start system with improved security has been mounted on the vehicle. As such an engine starting system, an immobilizer unit that determines whether a vehicle key is true or false is connected to an engine control unit, and the engine is allowed to start according to the determination result of the key. It is disclosed in Document 1 and the like.
Japanese Patent No. 3415278

  Now, in general, a vehicle equipped with an engine start system equipped with an immobilizer unit is expensive, and there are many users who desire a vehicle not equipped with the system. Therefore, in order to meet various needs, vehicles with and without a system may be prepared according to vehicle grades, or one of them as a standard and the other as an option. However, when a system-equipped vehicle and a non-equipped vehicle are prepared, if the engine control unit of the system-equipped vehicle is illegally exchanged with the engine control unit of the non-equipped vehicle, the engine is used regardless of the determination result of the immobilizer unit. There was a problem that was started.

  The present invention has been made in view of these problems, and an object thereof is to provide a vehicle engine start system for improving the security of the vehicle.

The invention described in claim 1 includes an engine control unit that controls the engine of the vehicle and a vehicle element control unit that controls vehicle elements other than the engine, and the vehicle element control unit is a vehicle for controlling the vehicle elements. A read-only memory for storing an element control program, in which immobilizer information indicating the presence or absence of an immobilizer unit for determining the authenticity of a vehicle key is stored before the vehicle element control unit is mounted on a vehicle. The engine control unit stores immobilizer information, and when the vehicle ignition switch is turned on, the engine control unit and the read-only memory of the vehicle element control unit respectively check the stored immobilizer information. To determine whether or not to start the engine.

  According to the first aspect of the present invention, when the engine control unit of the vehicle with the immobilizer is illegally replaced with the engine control unit of the vehicle without the immobilizer, the immobilizer information stored in the unit after the replacement is not immobilizer. However, the immobilizer information stored in the read-only memory of the vehicle element control unit represents that the immobilizer is present. Therefore, by checking the immobilizer information of each unit, it is possible to correctly determine whether or not to start the engine. Moreover, since the immobilizer information is stored in the read-only memory in the vehicle element control unit, it is possible to prevent the immobilizer information from being illegally rewritten. For these reasons, security against vehicle theft is enhanced.

  According to the second aspect of the present invention, the engine control unit is configured such that the stored immobilizer information indicates the absence of the immobilizer unit and the immobilizer information stored in the read-only memory of the vehicle element control unit indicates the presence of the immobilizer unit. Prohibit engine start. According to this, when an engine control unit of a vehicle with an immobilizer is illegally replaced with an engine control unit of a vehicle without an immobilizer, the engine start is surely prohibited and the vehicle is difficult to move. Can contribute to prevention.

  Since the invention according to claim 3 includes a plurality of vehicle element control units, it takes time to start the engine by tampering with the vehicle element control units. Therefore, a high deterrent effect against vehicle theft can be exhibited.

  According to the invention described in claim 4, the engine control unit has the immobilizer information stored therein indicating that the immobilizer unit is absent, and at least one of the immobilizer information stored in the read-only memory of each vehicle element control unit is the immobilizer unit. When the presence is indicated, engine start is prohibited. According to this, as long as all of the plurality of vehicle element control units fail or are not tampered with, it is possible to correctly determine whether or not to start the engine, so that higher security can be realized.

The invention according to claim 5 includes an engine control unit that controls an engine of the vehicle and a vehicle element control unit that controls vehicle elements other than the engine, and the vehicle element control unit is a vehicle for controlling the vehicle elements. A non-volatile memory for storing an element control program, in which immobilizer information indicating the presence or absence of an immobilizer unit for determining the authenticity of a vehicle key is stored before the vehicle element control unit is mounted on a vehicle. The engine control unit stores immobilizer information, and when the vehicle ignition switch is turned on, the engine control unit and the nonvolatile memory of the vehicle element control unit respectively check the stored immobilizer information. To determine whether or not to start the engine.

  According to the invention described in claim 5, when the engine control unit of a vehicle with an immobilizer is illegally replaced with the engine control unit of a vehicle without an immobilizer, the immobilizer information stored in the unit after the replacement is not immobilizer. However, the immobilizer information stored in the nonvolatile memory of the vehicle element control unit represents that the immobilizer is present. Therefore, by checking the stored immobilizer information in each unit, it is possible to correctly determine whether or not the engine is started, and the security against vehicle theft is improved. In addition, since the immobilizer information is stored in the nonvolatile memory in the vehicle element control unit, it is not necessary to prepare a dedicated memory for each immobilizer information having different contents, and the nonvolatile information is stored in a timely manner before the unit is mounted on the vehicle. It is only necessary to store information in the memory.

The invention described in claim 6 includes an engine control unit that controls the engine of the vehicle, and a vehicle element control unit that controls vehicle elements other than the engine, and the vehicle element control unit is a vehicle for controlling the vehicle elements. A non-volatile memory for storing an element control program, wherein immobilizer information indicating the presence or absence of an immobilizer unit for determining the authenticity of a vehicle key is stored when the vehicle element control unit is mounted on a vehicle. The engine control unit stores immobilizer information. When the vehicle element control unit is mounted on a vehicle, the engine control unit transmits the immobilizer information stored in the engine control unit to the vehicle element control unit and stores it in the nonvolatile memory. When the ignition switch is turned on, the engine control unit and vehicle element control unit By matching Tsu bets each immobilizer information stored in the nonvolatile memory, and judging whether to permit start of the engine.

  According to the invention described in claim 6, when the engine control unit of a vehicle with an immobilizer is illegally replaced with the engine control unit of a vehicle without an immobilizer, the immobilizer information stored in the unit after the replacement is not immobilizer. However, the immobilizer information stored in the nonvolatile memory of the vehicle element control unit represents that the immobilizer is present. Therefore, by checking the stored immobilizer information in each unit, it is possible to correctly determine whether or not the engine is started, and the security against vehicle theft is improved. Further, since the immobilizer information is stored in the nonvolatile memory in the vehicle element control unit, it is not necessary to prepare a dedicated memory for each immobilizer information having different contents, and the nonvolatile memory can be transferred to the nonvolatile memory when the unit is mounted on the vehicle. This information transmission is only realized by the engine control unit. In addition, since the information transmission to the nonvolatile memory can be automated by the engine control unit, the complicated work for storing information can be reduced in that case.

  The nonvolatile memory may be dedicated to storing immobilizer information, but may store information other than immobilizer information as in the seventh aspect of the invention. In this case, since the immobilizer information can be stored using the nonvolatile memory of the existing vehicle element control unit, the security of the vehicle can be improved while suppressing an increase in cost.

  According to the invention described in claim 8, the engine control unit has the immobilizer information stored therein indicating the absence of the immobilizer unit and the immobilizer information stored in the nonvolatile memory of the vehicle element control unit indicates the presence of the immobilizer unit. Prohibit engine start. According to this, when an engine control unit of a vehicle with an immobilizer is illegally replaced with an engine control unit of a vehicle without an immobilizer, the engine start is surely prohibited and the vehicle is difficult to move. Can contribute to prevention.

  Since the invention according to claim 9 includes a plurality of vehicle element control units, it takes time to start the engine by tampering with the vehicle element control units. Therefore, a high deterrent effect against vehicle theft can be exhibited.

  According to the invention described in claim 10, the engine control unit has the immobilizer information stored therein indicating the absence of the immobilizer unit, and at least one of the immobilizer information stored in the nonvolatile memory of each vehicle element control unit is the immobilizer unit. When the presence is indicated, engine start is prohibited. According to this, as long as all of the plurality of vehicle element control units fail or are not tampered with, it is possible to correctly determine whether or not to start the engine, so that higher security can be realized.

  The invention according to claim 11 is provided with an immobilizer unit that instructs the engine control unit whether to start the engine according to the determination result of the authenticity of the key of the vehicle, and the engine control unit checks the engine by checking the immobilizer information. When the start permission judgment is made, the engine start is permitted or rejected according to the command from the immobilizer unit, and when the engine start prohibition judgment is made by checking the immobilizer information, the command from the immobilizer unit is ignored. To prohibit starting the engine.

  According to the eleventh aspect of the present invention, since the engine can be started only when the engine control unit correctly determines whether the engine is allowed to start, the vehicle theft can be reliably prevented.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
As shown in FIG. 1, a vehicle engine start system (hereinafter simply referred to as a system) 10 according to a first embodiment of the present invention includes an engine control unit 20 that controls a vehicle engine 2 and a vehicle engine 2. The vehicle element control unit 30 for controlling the element 3 is provided regardless of the grade of the vehicle. Further, the system 10 is selectively provided with an immobilizer unit 50 for determining the authenticity of the electronic key 6 of the vehicle depending on the grade of the vehicle. That is, in this embodiment, the system 10 with the immobilizer unit 50 and the system 10 without the immobilizer unit 50 are prepared according to the grade of the vehicle. FIG. 1 shows a system 10 with a high-grade immobilizer unit 50 (hereinafter referred to as “immobilizer”), and a system 10 without a low-grade immobilizer unit 50 (hereinafter referred to as “no immobilizer”). Is omitted from the illustration. In the following description, the system 10 with immobility will be mainly described, and the system 10 without immobility will be supplementarily described as necessary.

  The immobilizer unit 50 is connected to the engine control unit 20 so that bidirectional communication is possible. The immobilizer unit 50 is mainly composed of a microcomputer, and includes a memory 52 and an antenna 54. The memory 52 is a non-rewritable read-only memory (hereinafter referred to as ROM) or a rewritable non-volatile memory (for example, EEPROM or the like; hereinafter the same), and stores identification data (for example, ID or the like). Yes. Here, the identification data stored in the memory 52 is the same as the identification data uniquely assigned to the electronic key 6. The antenna 54 performs data communication with the electronic key 6 and receives identification data transmitted from the electronic key 6 inserted into a key throttle (not shown) of the vehicle. The immobilizer unit 50 determines whether the electronic key 6 is authentic by checking whether or not the received identification data matches the identification data stored in the memory 52, and starts the engine 2 according to the determination result. Is given to the engine control unit 20.

  The vehicle element control unit 30 is connected to the engine control unit 20 so as to be capable of bidirectional communication. The vehicle element control unit 30 is mainly composed of a microcomputer and includes a memory 32. The memory 32 of the present embodiment is a ROM, and stores a vehicle element control program for controlling the vehicle element 3. The memory 32 stores a communication program for transmitting immobilizer information indicating the presence / absence of the immobilizer unit 50 to the engine control unit 20, and the immobilizer information is incorporated in the communication program. Therefore, the immobilizer information is stored in the memory 32 including the ROM as a part of the communication program when the memory 32 before the vehicle element control unit 30 is mounted on the vehicle.

  The engine control unit 20 is mainly composed of a microcomputer and includes a memory 22. The memory 22 of the present embodiment is a ROM, and stores an engine control program for controlling the engine 2 according to the vehicle state while communicating with the units 30, 50 and the like. Here, in the engine control program, immobilizer information having the same content as that stored in the memory 32 of the vehicle element control unit 30 is incorporated. Therefore, the engine control unit 20 determines whether the engine 2 is permitted to start by checking whether the immobilizer information received from the vehicle element control unit 30 matches the immobilizer information stored in the memory 22. The engine 2 is permitted to start according to the command from the immobilizer unit 50 only when In other words, when the engine control unit 20 makes a start prohibition determination, the engine control unit 20 forcibly prohibits the start of the engine 2 ignoring the command from the immobilizer unit 50.

  The engine control unit 20 in the immobilizer-free system 10 determines whether or not to start the engine 2 by comparing the information received from the vehicle element control unit 30 with the information stored in the memory 22 and makes a permission determination. As long as the engine 2 is started.

  Next, operation | movement of the system 10 with the immobilizer unit 50 is demonstrated according to the flowchart of FIG.

  First, the immobilizer unit 50 collates the identification data transmitted from the electronic key 6 inserted into the key throttle of the vehicle with the identification data stored in the memory 52 (step S11). As a result, when the identification data of the electronic key 6 and the identification data of the memory 52 match, the immobilizer unit 50 determines that the electronic key 6 is a regular key, and issues a start permission command for the engine 2 to the engine control unit 20. (Step S12). On the other hand, when the identification data of the electronic key 6 and the identification data of the memory 52 do not match, the immobilizer unit 50 determines that the electronic key 6 is a fake, and gives a prohibition command to start the engine 2 to the engine control unit 20. (Step S13).

  After any of steps S12 and S13, the engine control unit 20 determines whether or not the ignition switch of the engine 2 is turned on by operating the electronic key 6 inserted into the key throttle (step S14). When the ignition switch is turned on, the engine control unit 20 gives an immobilizer information transmission command to the vehicle element control unit 30 (step S15). In response to this transmission command, the vehicle element control unit 30 transmits the immobilizer information stored in the memory 32 to the engine control unit 20 (step S16).

  The engine control unit 20 that has received the immobilizer information from the vehicle element control unit 30 collates the received information with the immobilizer information stored in the memory 22 (step S17). As a result, when the immobilizer information of the vehicle element control unit 30 is “Immobilized” and the immobilizer information of the memory 22 is “No Immobilizer” and the information does not match (A), the engine control unit 20 Start prohibition determination is made (step S18). Therefore, in this case, the engine control unit 20 prohibits the start of the engine 2 regardless of the command from the immobilizer unit 50 (step S19). On the other hand, when the immobilizer information of the vehicle element control unit 30 and the memory 22 match (B), or even if they do not match, the immobilizer information of the vehicle element control unit 30 is “no immobilizer” and the immobilizer information of the memory 22 If “Imobi is present” (C), the engine 2 is permitted to start (step S20). However, in this case, since the engine control unit 20 permits or disables the start of the engine 2 in accordance with a command from the immobilizer unit 50 (steps S21, S22, S19), even if the permission determination is made in step S20, the immobilizer The engine 2 is started only when the command from the unit 50 is a permission command.

  In the case of the above (C), the engine 2 may be prohibited from starting by shifting to steps S18 and S19 instead of step S20. Further, in the system 10 without immobility, as shown in FIG. 3, steps S11 to S13 are omitted, and the engine 2 is started in step S23 after the start permission determination is made in step S20. .

  According to such a first embodiment, each time the ignition switch of the engine 2 is turned on, the immobilizer information of each unit 20 and 30 is collated, and the engine 2 is permitted to start according to the collation result. In particular, even if the engine control unit 20 of the system 10 with immobility is illegally replaced with the engine control unit 20 of the system 10 without immobilizer, the immobilizer information of each unit 20 and 30 is “no immobilizer” and “ When “Imobi is present”, the start of the engine 2 is surely prohibited. In addition, since the immobilizer information of each unit 20 and 30 is stored in the memories 22 and 32 made of ROM, it is possible to prevent the immobilizer information from being illegally rewritten. From these things, according to 1st embodiment, since the movement of a vehicle becomes difficult at the time of unauthorized modification of the system 10, the security property with respect to vehicle theft becomes high.

(Second embodiment)
As shown in FIG. 4, the second embodiment of the present invention is a modification of the first embodiment. The vehicle element control unit 100 according to the second embodiment includes a first memory 102 made of a nonvolatile memory in addition to the first memory 102 made of a ROM, both in the case with immobility shown in FIG. Two memories 104 are provided. The first memory 102 has the same configuration as the memory 32 of the first embodiment except that immobilizer information is not incorporated in the communication program. The second memory 104 stores immobilizer information. When the communication program in the first memory 102 is executed, the immobilizer information is read out and transmitted to the engine control unit 20. .

  Here, the storage of the immobilizer information in the second memory 104 formed of a nonvolatile memory may be performed by a predetermined operation when the unit 100 before the vehicle element control unit 100 is mounted on the vehicle. Alternatively, when the vehicle element control unit 100 is mounted on the vehicle, the vehicle element control unit 100 is connected to the engine control unit 20, whereby immobilizer information stored in the memory 22 is automatically transmitted from the engine control unit 20 to the vehicle element control unit 100. Then, it may be stored in the second memory 104. In the case of this automatic transmission, a complicated operation for storing information in the second memory 104 can be omitted, leading to an improvement in productivity.

  In the second embodiment described above, by performing the same operation as the first embodiment, in the case of unauthorized replacement of the engine control unit 20, the start of the engine 2 is surely prohibited and the vehicle is stolen. Can be prevented.

  In addition, according to the second embodiment, since the immobilizer information is stored in the second memory 104 composed of a non-volatile memory, even if a dedicated memory is not prepared for each immobilizer information having different contents, a single type is provided. The immobilizer information only needs to be stored later in the second memory 104 manufactured in this way. In addition, the second memory 104 formed of a nonvolatile memory can be used for storing control information in the control of the vehicle element 3, for example. In this case, it can contribute to cost reduction.

(Third embodiment)
As shown in FIG. 5, the third embodiment of the present invention is a modification of the first embodiment. In the third embodiment, the vehicle element control unit 202, which controls the vehicle elements 200 and 210 different from the vehicle element 3, both in the case with immobility in FIG. 212 is added. These vehicle element control units 202 and 212 have the same configuration as the vehicle element control unit 30 in points other than the control target elements 200 and 210.

  In the operation of the third embodiment, as shown in FIG. 6 in the case where there is immobility, the engine control unit 20 sends an immobilizer information transmission command to each vehicle element control unit 30, in step S15 ′ instead of step S15. 202, 212. In step S16 'instead of step S16, each vehicle element control unit 30, 202, 212 transmits the immobilizer information in the memory 32 to the engine control unit 20 in response to the transmission command.

  Further, in step S17′a instead of step S17, the engine control unit 20 refers to the immobilizer information received from each of the vehicle element control units 30, 202, 212, and matches information (hereinafter referred to as “immobilizer information” stored in the memory 22). , Referred to as verification target information). Specifically, when at least one content of the immobilizer information received from each vehicle element control unit 30, 202, 212 is “Immobilized”, the content of the verification target information is determined as “Immobilized”. On the other hand, when all of the immobilizer information received from the vehicle element control units 30, 202, 212 is “no immobilizer”, the content of the verification target information is determined as “no immobilizer”. After such determination, in step S17'b instead of step S17, the engine control unit 20 collates the collation target information with the immobilizer information in the memory 22 in accordance with step S17 of the first embodiment.

  The steps other than those described above are the same as in the first embodiment. Also, in the case where there is no immobility, although not shown, the above-described step change is added.

  According to the third embodiment described above, immobilizer information is stored in the plurality of vehicle element control units 30, 202, 212, so that the engine 2 can be started by tampering with the units 30, 202, 212. Takes time. Therefore, a high deterrent effect against vehicle theft can be exhibited.

  Further, according to the third embodiment, when at least one content of the immobilizer information of the vehicle element control units 30, 202, 212 is “Immobilized”, the immobilizer information of “Immobilized” is stored in the engine control unit 20. Matched with immobilizer information. Therefore, as long as all of the vehicle element control units 30, 202, 212 fail or are not tampered with, it is possible to correctly determine whether to start the engine 2 and to realize higher security.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described so far, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. be able to.

  For example, in the first to third embodiments, in addition to the memory 22 that is configured from the ROM and stores the engine control program in which immobilizer information is not incorporated, a memory that is configured from a nonvolatile memory and stores immobilizer information is provided. It may be.

  In the first to third embodiments, the identification data may be collated between the immobilizer unit 50 and the engine control unit 20 when there is immobility. In this case, by permitting the start of the engine 2 after the start permission determination of the engine 2 is made in step S20 according to the instruction from the immobilizer unit 50 and the collation result of the identification data between the elements 50 and 20 Therefore, the accuracy of the permission / refusal can be improved.

  Furthermore, in 3rd embodiment, it is good also as a structure which memorize | stores immobilizer information in a non-volatile memory according to the vehicle element control unit 100 of 2nd embodiment about the structure of each vehicle element control unit 30,202,212. In the third embodiment, the number of vehicle element control units connected to the engine control unit 20 may be set to a plurality other than the three described above. In addition, in the third embodiment, information selected by majority from the immobilizer information of each vehicle element control unit 30, 202, 212 may be collated with the immobilizer information of the engine control unit 20. In this case, it is desirable to set the number of vehicle element control units connected to the engine control unit 20 to an odd number other than three.

It is a block diagram which shows the structure in case the immobilizer unit exists with the engine start system for vehicles by 1st embodiment of this invention. It is a flowchart which shows the action | operation in the case of having an immobilizer unit of the vehicle engine start system by 1st embodiment of this invention. It is a flowchart which shows the action | operation in the case of no immobilizer unit of the vehicle engine starting system by 1st embodiment of this invention. It is a block diagram which shows the structure in case an immobilizer unit exists with the engine start system for vehicles by 2nd embodiment of this invention. It is a block diagram which shows the structure in case the immobilizer unit exists with the engine start system for vehicles by 3rd embodiment of this invention. It is a flowchart which shows the action | operation in the case of having an immobilizer unit of the vehicle engine starting system by 3rd embodiment of this invention.

Explanation of symbols

2 Engine, 3,200,210 Vehicle element, 6 Electronic key (key), 10 Engine start system for vehicle, 20 Engine control unit, 22 Memory, 30, 100, 202, 212 Vehicle element control unit, 32 Memory (read only) Memory), 50 immobilizer unit, 52 memory, 54 antenna, 102 first memory, 104 second memory (non-volatile memory)

Claims (11)

An engine control unit that controls the engine of the vehicle, and a vehicle element control unit that controls vehicle elements other than the engine,
The vehicle element control unit includes:
A read-only memory for storing a vehicle element control program for controlling the vehicle element, wherein immobilizer information indicating the presence or absence of an immobilizer unit for determining the authenticity of the vehicle key is sent to the vehicle of the vehicle element control unit. It has a read-only memory that is stored before mounting
The engine control unit includes:
The immobilizer information is stored, and when the ignition switch of the vehicle is turned on, the engine control unit and the read-only memory are collated with the stored immobilizer information to determine whether or not to start the engine. An engine start system for a vehicle, characterized in that   The engine control unit starts the engine when the immobilizer information stored in the engine control unit represents the absence of the immobilizer unit, and the immobilizer information stored in the read-only memory represents the presence of the immobilizer unit. The vehicle engine starting system according to claim 1, wherein   The vehicle engine starting system according to claim 1 or 2, wherein a plurality of the vehicle element control units are provided.   In the engine control unit, the immobilizer information stored in the engine control unit represents the absence of the immobilizer unit, and at least one of the immobilizer information stored in the read-only memory of each vehicle element control unit is the immobilizer unit. 4. The vehicle engine start system according to claim 3, wherein the start of the engine is prohibited when the presence of the engine is indicated. An engine control unit that controls the engine of the vehicle, and a vehicle element control unit that controls vehicle elements other than the engine,
The vehicle element control unit includes:
A non-volatile memory for storing a vehicle element control program for controlling the vehicle element, wherein immobilizer information indicating the presence or absence of an immobilizer unit that determines the authenticity of the key of the vehicle is sent to the vehicle of the vehicle element control unit Has a non-volatile memory that is stored before mounting
The engine control unit includes:
The immobilizer information is stored, and when the ignition switch of the vehicle is turned on, the engine control unit and the nonvolatile memory are collated with the stored immobilizer information to determine whether or not to start the engine. An engine start system for a vehicle, characterized in that An engine control unit that controls the engine of the vehicle, and a vehicle element control unit that controls vehicle elements other than the engine,
The vehicle element control unit includes:
A non-volatile memory for storing a vehicle element control program for controlling the vehicle element, wherein immobilizer information indicating the presence or absence of an immobilizer unit that determines the authenticity of the key of the vehicle is sent to the vehicle of the vehicle element control unit Has a non-volatile memory that is stored when
The engine control unit includes:
The immobilizer information is stored, and when the vehicle element control unit is mounted on the vehicle, the immobilizer information stored in the engine control unit is transmitted to the vehicle element control unit and stored in the nonvolatile memory, When the ignition switch of the vehicle is turned on, whether the engine is started or not is determined by checking the immobilizer information stored in the engine control unit and the nonvolatile memory, respectively. Engine starting system.   The vehicle engine start system according to claim 5 or 6, wherein the nonvolatile memory stores information other than the immobilizer information.   The engine control unit starts the engine when the immobilizer information stored in the engine control unit represents the absence of the immobilizer unit and the immobilizer information stored in the nonvolatile memory represents the presence of the immobilizer unit. The engine starting system for vehicles according to any one of claims 5 to 7, wherein   The vehicle engine starting system according to any one of claims 5 to 8, comprising a plurality of the vehicle element control units.   In the engine control unit, the immobilizer information stored in the engine control unit represents the absence of the immobilizer unit, and at least one of the immobilizer information stored in the nonvolatile memory of each vehicle element control unit is the immobilizer unit. 10. The vehicular engine start system according to claim 9, wherein the start of the engine is prohibited when the presence of the engine is indicated. The immobilizer unit that instructs the engine control unit whether to start the engine according to the determination result of the authenticity of the key,
The engine control unit permits or rejects the start of the engine in accordance with the command from the immobilizer unit when the engine start permission determination is made by checking the immobilizer information. 11. The vehicle according to claim 1, wherein when the engine start prohibition determination is made, the engine start is prohibited by ignoring the command from the immobilizer unit. Engine start system.

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