JP3648747B2 - Automotive control device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an apparatus that can easily improve the function of an automobile control apparatus using a computer system.
[0002]
[Prior art]
In recent years, microcomputers have come to be used for controlling various automobile control devices such as an engine system, a brake system, and an air conditioning system. These microcomputers are connected by an in-vehicle LAN and complement each other.
[0003]
[Problems to be solved by the invention]
In the various vehicle control apparatuses described above, a control program, control data, and the like for controlling various actuators are stored in a mask ROM. In the automobile control device, after the device is developed and installed in a new vehicle at the factory, the control program is improved, the control data is changed, etc., in order to improve the function.
[0004]
However, when the control program is revised, the control program is stored in the mask ROM in order to use the control program in a car that has already been sold. Therefore, it is necessary to replace the car control device itself. there were.
As a result, it has been impossible in practice to improve the function of the control device in already sold automobiles.
[0005]
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to easily execute the function improvement of the apparatus in the computer control apparatus of the computer system.
[0006]
[Means for Solving the Problems]
The configuration of the first invention for solving the serial problems, a plurality of control devices for controlling various devices mounted on a vehicle based on a control program及 beauty control data stored in the storage device has a central processing unit Each of the control devices is connected via a local area network, and each control device performs data communication with each other, and receives the spatial radio wave as one of a plurality of control devices , the local area network A communication control device that transmits received data to each control device connected to the control device, and the plurality of control devices include a nonvolatile memory that can rewrite the stored control program and control data as the storage device. The communication control device has a modification to the control device including identification data and the rewritable nonvolatile memory. Address decode to decode the data frame receiving unit, the received data frame whether the data transmitted to its own device addressed on the basis of the identification data received data frame containing a control program and control data And the rewritten data including the revised control program and control data and the control device code of the control device to be rewritten when the data frame is transmitted to the device itself. Rewrite data sending means for sending to the network, and each of the control devices comprising the rewritable nonvolatile memory includes a rewrite data receiving means for receiving the rewrite data from the local area network, Whether or not the data is addressed to the control device. And the contents of the control program and control data stored in the rewritable nonvolatile memory based on the received rewrite data when it is determined that the rewrite data is destined for its own control device. the is characterized in that a rewrite control means for rewriting the revision is a control program and control data.
The configuration of the second invention is a control device mounted in an automobile for controlling various devices mounted on a vehicle based on a control program stored in the storage device has a central processing unit and the control data, the The control device is one of a plurality of control devices connected via a local area network, and a communication control device that receives spatial radio waves is connected to the local area network, and the control device A storage device is a nonvolatile memory in which the stored control program and control data can be rewritten, and the control device includes rewritten data including the revised control program and control data received by the communication control device. Is received via the local area network and addressed to the self-device based on the control device code included in the rewrite data. It is determined whether or not it is rewrite data, and if it is rewrite data addressed to its own device, the contents of the control program and control data stored in the nonvolatile memory are rewritten based on the rewrite data, and the rewrite is completed. A message indicating completion is transmitted to the communication control apparatus via the local area network .
[0007]
[Action]
When the control program is revised, for example, the control program and control data are transmitted to the space by radio waves using a spatial network by the manufacturer of the control device for automobiles. A car traveling in the city receives this radio wave, determines whether or not the received data is data transmitted for its own device, and this data is transmitted to its own device. Data stored in the non-volatile memory is rewritten with the received data. This data becomes a control program and control data to be executed by the central processing unit of the automobile control device mounted on the automobile after reception.
In this way, it is possible to easily improve the functions of the automobile control device even in a car that has already been sold.
[0008]
【The invention's effect】
The present invention relates to a rewritable nonvolatile memory for storing data necessary for vehicle control, and an address decoding means for decoding whether or not the data received by the receiving device is data transmitted to its own device And rewriting control means for rewriting the data stored in the non-volatile memory with the received data when the received data is data transmitted to the own device by the address decoding means. Therefore, it is possible to receive data suitable for its own device from among the control program and control data transmitted to the space when the control program is revised, and rewrite the data stored in the nonvolatile memory with the received data. it can. Therefore, by executing a program based on data newly stored in the non-volatile memory, it becomes possible to implement the newest function even in an already-sold car.
[0009]
【Example】
Hereinafter, the present invention will be described based on a specific example.
FIG. 1 shows the configuration of this apparatus.
A communication control device TC, an engine control device T1, a brake control device T2, and the like are connected to a local area network (hereinafter referred to as “LAN”) 30. The engine control device T1 and the brake control device T2 are composed of CPUs 100 and 200, E ² PROM (rewritable nonvolatile memory) 102 and 202, RAMs 104 and 204, and input / output interfaces 106 and 206, respectively.
[0010]
The communication control device TC includes an antenna 10, a receiver 12, a demodulator 14, a shift register 16, a CPU 18, an E ² PROM 20, and a RAM that constitute a receiving device.
22.
[0011]
The structure of the data frame propagated to the space is as shown in FIG. 2, for example. That is, it is composed of SOF (start of frame), ID, DATA, ECC, EOD, RSP, and EOF. In the ID area, identification data relating to the vehicle type of the vehicle that should receive this data frame, the type of data, the version number of the data, and the like is incorporated. A revised control program and control data are incorporated in the DATA area.
[0012]
Next, the operation of this apparatus will be described.
The FSK modulated wave of the data frame shown in FIG. 2 is radiated by the spatial network. A car traveling in the city receives this radio wave and performs data analysis. The FSK modulated wave received by the antenna 10 is amplified by the receiver 12, demodulated by the demodulator 14, and further sampled at a predetermined period, whereby each bit is composed of “0” and “1” in FIG. The data frame shown in FIG. The data frame is read by the CPU 18 and data analysis is executed.
[0013]
Next, the data analysis procedure of the communication control device TC will be described with reference to FIG.
This program is repeatedly executed at regular time intervals.
In step 101, it is determined whether a data frame has been received. If no data frame is received, the program ends. If a data frame is received, the data in the ID area is analyzed in step 102 to determine whether the vehicle type code matches the vehicle type code of the own vehicle. If the vehicle type codes do not match, this data frame is not the data addressed to its own device, so this program ends.
[0014]
On the other hand, if the vehicle type code of the received data frame matches the vehicle type code of the own car, the process proceeds to step 103, where the data type code and the version number code are decoded from the ID area. Then, it is determined whether or not the received data has already been stored in its own device. If the data has already been stored, the program ends without storing the data.
[0015]
If the received data is not yet stored, the process proceeds to step 104 where the received data is stored in the RAM 22 and the program is terminated.
[0016]
The CPU 18 of the communication control device TC repeatedly executes the programs shown in FIGS. 4 and 5 at predetermined time intervals in parallel with the program shown in FIG.
In the received data stored in the RAM 22, the data is transmitted to the engine control device T1, the brake control device T2, etc., and it is determined whether or not there is data that has not been rewritten such as the E ² PROM 102, 202. The If there is no rewrite data, this program ends.
If rewrite data exists, it is determined in step 202 whether or not the own vehicle is stopped. If the car is not stopped, data rewriting is not executed. If the automobile is stopped, in step 203, data to be rewritten in the E ² PROMs 102, 202, etc. is sent to the LAN 30, and the execution of this program is terminated.
[0017]
Each control device T1, T2, etc. selectively receives this data from LAN 30 as rewrite data related to its own control device, and stores the contents of a predetermined address corresponding to the received rewrite data such as E ² PROM 102, 202, etc. Rewrite to rewrite data. When the storage of the control program, control data, etc. is completed in the E ² PROMs 102, 202, etc., each control device T1, T2, etc. outputs a storage completion signal to the LAN 30.
[0018]
In the program of FIG. 5, the CPU 18 of the communication control device TC determines whether or not the storage completion signal output from each control device T1, T2, etc. is received from the LAN 30 in step 301. If no storage completion signal is received, the program ends. Next, if a storage completion signal is received, in step 302, the rewrite completion flag corresponding to the control device that has output the storage completion signal is set to "1", and this program ends. This rewriting completion flag is referred to in step 201, and thereafter, rewriting data transmission to the control device corresponding to the rewriting completion flag set to “1” is not executed.
[0019]
Each control device T1, T2 receives the rewrite data from the LAN 30 by repeatedly executing the program of FIG. 6 at a predetermined time period, and stores it in the E ² PROMs 102, 202, and the like.
In step 401, it is determined whether or not rewrite data is received from the LAN 30, and if no rewrite data is received, this program ends.
Next, if rewrite data is received from the LAN 30, it is determined in step 402 whether or not the control device code of the rewrite data matches its own device code. If they do not match, the program is terminated because the data is not addressed to the device itself.
[0020]
If it is determined that the data is addressed to the self-device, in step 403, the type code and version number code of the rewrite data are changed to the data type code and version number code already stored in the E ² PROM. It is determined whether or not they match. If the two codes match, there is no need to rewrite the contents of the E ² PROM, and the program ends.
[0021]
If the two codes do not match, it means that the data stored in the E ² PROM has not been revised to the latest version. Therefore, in this case, in step 404, the contents of the E ² PROM are rewritten with the received data. Next, in step 405, the stored data in the E ² PROM is checked. If it is determined in step 406 that an error has been detected, it is determined in step 407 whether or not the error flag ERO is set to “1”. If the error flag ERO is not set to “1”. In step 408, the error flag ERO is set to “1”, the process returns to step 404, and the E ² PROM is rewritten again with the received data. Similarly, an error check is executed.
[0022]
If the error flag ERO is set to “1” in step 407, it means that the rewriting of the E ² PROM has been executed twice, but a co-rewriting error has occurred twice. In this case, in step 409, a diagnostic code indicating the type of error is stored. Next, in step 410, the type code and the version number code of the received data are stored as the code of the current stored data. Next, in step 411, the control mode is switched so that the control program is not executed according to the contents of the E ² PROM, but is executed by a predetermined backup control program when an error occurs.
[0023]
On the other hand, if it is determined in step 406 that a write data error has not occurred, the received data type code and version code are stored as the currently stored data type code and version code in step 412. Next, in step 413, a storage completion signal is transmitted to the LAN 30.
[0024]
In this way, the contents of the E ² PROMs 102 and 202 of the control devices T1 and T2 are rewritten. After the rewriting is completed normally, the CPUs 100 and 200 of the control devices T1 and T2 control each device based on the control program and control data newly stored in the E ² PROMs 102 and 202.
In this manner, even if the revision of the functions of the automobile control system is carried out, without applying any burden on car owners and automobile repair business, to improve the function of the vehicle control apparatus up to date Is possible.
[0025]
In the above embodiment, a transmission device is added to the communication control device TC, and when rewriting of data is completed with the received data, a rewriting completion signal may be transmitted together with data for identifying the own vehicle. good. In this case, it becomes possible for the data sender to easily grasp which vehicle control device has been revised.
[0026]
Further, the communication control device TC may be provided with a rewrite voltage supply device that individually supplies a rewrite voltage (5V, 12V, 24V, etc.) according to the type of the E ² PROM 102, 202, etc. of each control device T1, T2, etc. good.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of an automobile control device according to a specific embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of a data frame.
FIG. 3 is a flowchart showing a processing procedure of a CPU of the communication control device.
FIG. 4 is a flowchart showing a processing procedure of a CPU of the communication control device.
FIG. 5 is a flowchart showing a processing procedure of a CPU of the communication control device.
FIG. 6 is a flowchart showing a processing device of a CPU of each control device.
[Explanation of symbols]
TC: Communication control device T1: Engine device T2: Brake control device 20, 102, 202 ... E ² PROM (rewritable nonvolatile memory)
12 ... Receiver (receiving device) 14 ... Demodulator (receiving device)
18 ... CPU (receiving device, address decoding means, writing control means)
100, 200... CPU (write control means)
Step 102 ... Address decoding means Step 104, 201 to 203, 301, 302, 401, 413 ... Write control means

Claims (9)

A plurality of control devices for controlling various devices mounted on a vehicle based on a control program及 beauty control data stored in the storage device has a central processing unit, each control unit is connected via a local area network, In an automobile control device in which each control device performs data communication with each other ,
As one of the plurality of control devices, a communication control device that receives spatial radio waves and transmits reception data to each control device connected to the local area network is provided.
The plurality of control devices is a control device having a nonvolatile memory in which the stored control program and control data can be rewritten as the storage device,
The communication control device includes:
A data frame receiving means for receiving a data frame including a control program and control data that have been revised for a control device comprising identification data and the rewritable nonvolatile memory;
Address decoding means received data frame to decode whether the data transmitted to the self equipment addressed on the basis of the identification data,
When it is decoded that it is a data frame transmitted to its own device, the rewritten data including the revised control program and control data and the control device code of the control device to be rewritten is sent to the local area network. Rewriting data sending means
Each of the control devices including the rewritable nonvolatile memory includes:
Rewrite data receiving means for receiving the rewrite data from the local area network;
Determination means for determining whether the received rewrite data is data addressed to its own control device based on the control device code;
The control program stored in the rewritable non-volatile memory based on the received rewrite data and the contents of the control data are revised when it is determined that the rewrite data is addressed to its own control device. automotive control device being characterized in that a rewrite control means for rewriting the or control data. The automobile control device according to claim 1,
The rewrite control means is configured to repeatedly perform rewrite when rewriting of the contents of the control program and control data stored in the rewritable nonvolatile memory is not successful,
Each of the control devices including the rewritable nonvolatile memory further includes
An automotive control apparatus comprising: a rewrite canceling unit that cancels rewriting when rewriting by the rewriting control unit is not successful even after being repeated a predetermined number of times . The vehicle control device according to claim 2,
Each of the control devices including the rewritable nonvolatile memory further includes
When rewriting is canceled by the rewrite canceling means, a diagnostic code for storing a diagnostic code which means that rewriting of the contents of the control program and control data stored in the rewritable nonvolatile memory is canceled An automobile control device comprising storage means . The vehicle control device according to claim 2,
Each of the control devices including the rewritable nonvolatile memory further includes
When rewriting is canceled by the rewrite canceling means, it comprises control switching means for switching from control by a control program stored in the rewritable nonvolatile memory to control by a backup control program. Car control device. The automobile control device according to claim 1,
The data frame received by the data frame reception means of the communication control device includes a revised control program and a version code for the control data,
The rewrite data sending means of the communication control device sends the rewrite data to be sent to the local area network including the version number code,
Each of the control devices including the rewritable nonvolatile memory includes:
The control program stored in the rewritable nonvolatile memory and the version code for the control data are also stored,
Each of the control devices including the rewritable nonvolatile memory further includes
The version number code included in the rewrite data received by the rewrite data receiving means and the version number code stored in the rewritable nonvolatile memory are stored in the rewritable nonvolatile memory. Rewriting necessity judging means for judging whether or not it is necessary to rewrite the contents of the control program and the control data,
Only when it is determined that rewriting is necessary by the rewriting necessity judging means, the rewriting of the control program and control data stored in the rewritable nonvolatile memory by the rewriting control means is performed. Car control device. The automobile control device according to claim 1,
Each of the control devices including the rewritable nonvolatile memory further includes
A vehicle control apparatus comprising: a storage completion transmitting unit that transmits a storage completion message to the local area network when the rewriting by the rewriting control unit is successful. The vehicle control device according to claim 6, wherein
The communication control device further includes
When the completion of storage by the storage completion transmission means is received via the local area network, the data specifying the own vehicle is replied to the transmission base that has transmitted the data frame to the own device together with the data specifying the own vehicle. A vehicle control device comprising a reply means for performing the operation. In a control device mounted on a vehicle that has a central processing unit and controls various devices mounted on the vehicle based on the control program and control data stored in the storage device,
The control device is one of a plurality of control devices connected via a local area network, and a communication control device that receives spatial radio waves is connected to the local area network,
The storage device in the control device is a non-volatile memory in which the stored control program and control data can be rewritten,
The control device
Rewrite data including the revised control program and control data received by the communication control device is received via the local area network, and the rewrite data addressed to the self device is based on the control device code included in the rewrite data. If it is rewrite data addressed to the own device, the control program and control data stored in the nonvolatile memory are rewritten based on the rewrite data, and the rewriting is completed when the rewriting is completed. A control device mounted on a vehicle, which transmits a message to the communication control device via the local area network. A control device mounted on a vehicle according to claim 8,
The control device stores the version code of the control program and control data stored in the nonvolatile memory in the nonvolatile memory, and the version code stored in the rewritten data The control program stored in the non-volatile memory is determined from the code and whether or not rewriting of the contents of the control data is necessary, and the control program stored in the non-volatile memory only when it is determined that rewriting is necessary And rewriting the contents of the control data based on the rewrite data, and rewriting the version code stored in the non-volatile memory with the version code included in the rewrite data. Control unit.

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