JP2009001135A - Lamp lighting control device for automobile and lamp lighting control method for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly relight a lamp for an automobile after resetting without causing a malfunction. <P>SOLUTION: When an ECU is reset, after finishing initializing processing by a CPU, before receiving lighting indication data via a network, a determination is made on whether the lighting indication data stored in a RAM just before resetting is broken, and relighting of a tail lamp lighting unit after resetting is quickly performed without causing the malfunction by controlling lighting of the tail lamp lighting unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automobile lamp lighting control device and an automobile lamp lighting control method suitable for lighting control of an automobile lamp.

  In vehicles such as automobiles, ECU (Electronic Control Unit), which is a microcomputer, performs, for example, engine ignition timing control and tail lamp by data communication via a network bus using a serial communication protocol such as CAN (Controller Area Network). Control of turning on / off the lamps for automobiles and the like is performed.

  By the way, if the ECU is reset for some reason while the vehicle lamp such as a tail lamp is turned on, new data instructing lighting is received for a certain period until the initialization process of the ECU is completed. For example, a vehicle lamp such as a tail lamp that was turned on before the ECU was reset is turned off until the new data is obtained.

  When such an ECU reset occurs, there is no problem as long as the initialization process in the ECU is completed early and new data is received early. If it takes a long time to be received, it may take a long time to relight a car lamp such as a tail lamp. In this case, if it takes time to relight the tail lamp at night, the existence of the vehicle cannot be notified to the following vehicle unless the brake lamp is lit, which may cause a rear-end collision. Conceivable.

In Japanese Patent Application Laid-Open No. 2004-228688, when a microcomputer is reset and is initialized by losing information for determining whether a light is lit, the memory is turned on and off immediately before the reset. Information stored in the memory, when the microcomputer returns from reset, the light on / off state information is read from the memory, and based on that information, the light on / off state is restored to the state before the reset. An auto light system is proposed.
Japanese Patent Laying-Open No. 2005-041336

  In the above-mentioned Patent Document 1, even when the microcomputer is reset during running with the light turned on, when the microcomputer returns from the reset, the light on / off state information is read from the memory and the state before the reset is read. To be able to return to.

  However, in Patent Document 1, when the microcomputer returns from reset, the light on / off state information immediately before the reset stored in the memory is simply read, and the light on / off state information stored in the memory is read. It is not checked whether the data indicating is not destroyed.

  In particular, if a reset is applied during access to the memory, the writing process or reading process to the memory is interrupted, so that the data in the memory is destroyed and a memory error is likely to occur. It is.

  Therefore, when the microcomputer returns from reset as in Patent Document 1, if the light on / off state information of the light immediately before the reset stored in the memory is simply read, the light may malfunction. There was a problem.

  The present invention has been made in view of such a situation, and an object thereof is to provide an automotive lamp lighting control device and an automotive lamp lighting control method capable of solving the above problems.

The automotive lamp lighting control device of the present invention is an automotive lamp lighting control device that is connected to a network bus and performs lighting control of the automotive lamp based on lighting instruction data obtained through the network bus, A storage unit that stores the lighting instruction data; and a control unit that performs lighting control of the automotive lamp based on the lighting instruction data, and the control unit is reset and finished the initialization process, Before receiving the lighting instruction data via the network bus, it is determined whether or not the lighting instruction data immediately before the reset stored in the storage means has been destroyed, so that the lighting control of the automobile lamp is performed. It is characterized by performing.
Further, the control means distributes data having the same contents as the lighting instruction data in a storage area of the storage means and stores a plurality of data, and after the initialization process is finished, checks whether the data is the same. Thus, it can be determined whether or not the lighting instruction data is destroyed.
Further, at least arbitrary data among the plurality of stored data can be obtained by inverting the lighting instruction data.
An automotive lamp lighting control method of the present invention is an automotive lamp lighting control method that is connected to a network bus and performs lighting control of the automotive lamp on the basis of lighting instruction data obtained through the network bus. A step of performing lighting control of the automotive lamp based on at least the lighting instruction data stored in the means, and after completing the initialization process after being reset, the lighting instruction data via the network bus Before receiving, it is determined whether or not the lighting instruction data immediately before reset stored in the storage means is destroyed, and lighting control of the automotive lamp is performed.
In addition, by distributing a plurality of data having the same content as the lighting instruction data in the storage area of the storage means and storing the plurality of data, after finishing the initialization process, by checking whether the data is the same, And determining whether the lighting instruction data is not destroyed.
Further, at least arbitrary data among the plurality of stored data can be obtained by inverting the lighting instruction data.
In the automotive lamp lighting control device and the automotive lamp lighting control method according to the present invention, after the reset is completed and the initialization process is completed, the lighting instruction data via the network bus is received and stored in the storage means. The lighting control of the automobile lamp can be performed by determining whether the lighting instruction data immediately before the reset is not destroyed.

  According to the automobile lamp lighting control device and the automobile lamp lighting control method of the present invention, after the reset is finished and the initialization process is finished, before the lighting instruction data is received via the network bus, the storage means is stored. The lighting instruction data immediately before the reset stored in the memory is judged whether it has been destroyed or not, so that the lighting control of the automobile lamp is performed. It can be done quickly.

  In this embodiment, after the control means is reset and the initialization process is finished, before the lighting instruction data is received via the network bus, the lighting instruction data immediately before the reset stored in the storage means is stored. Judgment is made on whether or not the vehicle lamp has been destroyed, and the lighting control of the automobile lamp is performed, and the lighting of the automobile lamp after resetting can be performed quickly without malfunction.

  Here, for determining whether or not the lighting instruction data is destroyed, for example, the same content data as the lighting instruction data is distributed and stored in the storage area of the storage means, and after the initialization process, This can be done reliably by checking whether the data is the same.

  In addition, by making sure that at least any arbitrary data among the stored data is obtained by inverting the lighting instruction data, the reliability of the data when confirming whether the data is the same can be improved. Can be increased.

  Details of the embodiments of the present invention will be described below. FIG. 1 is a diagram for explaining an embodiment of an automotive lamp lighting control device according to the present invention.

  As shown in the figure, an ECU (Electronic Control Unit) 1 that is an automotive lamp lighting control device controls, for example, a body system, and is connected to a network bus 10 and has an input / output unit (I / I). O port) 2, CPU 3, RAM 4 and ROM 5.

  The input / output unit (I / O port) 2 receives switch inputs from the ignition switch SW1 and the light control switch SW2.

  The CPU 3 controls the lighting operation or extinguishing operation of the headlight lighting unit 20 and the tail lamp lighting unit 21 based on a predetermined control program stored in the ROM 5.

  As shown in FIG. 2 described later, the RAM 4 is provided with a plurality of work areas 40 to 43 and data holding areas 40A to 40C. The ROM 5 stores a control program for controlling the lighting operation or the extinguishing operation of the headlight lighting unit 20 and the tail lamp lighting unit 21, for example. The ROM 5 stores a control program and the like when the ECU 1 is reset.

  FIG. 2 is a diagram for explaining a storage area of the RAM 4. As shown in the figure, the RAM 4 is provided with a plurality of work areas 40 to 43 and a plurality of data holding areas 40A to 40C. Here, the work areas 40 to 43 are areas for storing calculation results obtained by reading a predetermined control program of the ROM 5 by the CPU 3. The plurality of data holding areas 40 </ b> A to 40 </ b> C are distributed in the storage area of the RAM 4, and are areas for storing data having the same contents for controlling the lighting operation or the extinguishing operation in the tail lamp lighting unit 21, for example. .

  Here, it is preferable that the data holding areas 40A to 40C be separated to some extent in consideration of data corruption. For example, in a certain microcomputer, addressing using an SB (static base) register is, for example, a maximum of 256 bytes, and when a frequently used indirect addressing mode is a 1-byte instruction, one branch has a maximum of 256 bytes. ing. For this reason, it is preferable to disperse the data holding areas 40A to 40C and separate them by 256 bytes. However, the 256 bytes, which are the intervals between the data holding areas 40A to 40C here, are merely examples, and can be set as appropriate according to the performance of the microcomputer to be used.

  As described above, when the ECU 1 is reset by storing the same data for controlling the lighting operation or the extinguishing operation in the tail lamp lighting unit 21 in the plurality of data holding areas 40A to 40C, for example. Even so, it is possible to confirm whether or not the data in the RAM 4 has been destroyed. In order to confirm whether or not the data in the RAM 4 is destroyed, especially when the reset is applied during the access to the RAM 4, the writing process or the reading process for the RAM 4 is interrupted, and the data in the RAM 4 is interrupted. This is an important procedure for avoiding the possibility that the memory will be destroyed and the possibility of the occurrence of memory abnormality becomes large.

  Therefore, if, for example, data for controlling the lighting operation in the tail lamp lighting unit 21 immediately before the reset of the ECU 1 is α, α is stored in the data holding area 40A, and the data holding area 40B is stored in the data holding area 40A. The stored α is copied and stored, and β obtained by inverting α is stored in the data holding area 40C.

  Here, in general, when the ECU 1 is reset for some reason, for example, as shown in FIG. 3, the CPU 3 waits for the initialization process to be completed, and the initialization process by the CPU 3 is completed. After the lighting instruction data is received via the network bus 10, the lighting control of the tail lamp lighting unit 21 is performed. That is, after the initialization process by the CPU 3 is completed, it takes time T until the tail lamp of the tail lamp lighting unit 21 returns to the state before the reset.

  On the other hand, in this embodiment, for example, as shown in FIG. 4, when the initialization process by the CPU 3 is completed, it is stored in the ROM 5 before the lighting instruction data is received via the network bus 10. Based on the control program when the ECU 1 is reset, first, the CPU 3 determines whether all the data stored in the data holding areas 40A to 40C are the same, and for example, lighting control of the tail lamp lighting unit 21 is performed. Here, the tail lamp of the tail lamp lighting unit 21 can be returned to the state before the reset at time t after the initialization process by the CPU 3 is completed. That is, the time T−t is shortened.

  Here, when returning to the state before the reset, it is determined whether or not the data in the RAM 4 is destroyed. In this case, the data stored in the data holding areas 40A and 40B, α, If the results of decoding β obtained by inverting α, which is data stored in the holding area 40C, are all the same, it is reliably confirmed that the data in the RAM 4 has not been destroyed. Moreover, since the data β stored in the data holding area 40C is data obtained by inverting α, the reliability of the data is improved, and the tail lamp of the tail lamp lighting unit 21 is erroneously operated. It is possible to quickly return to the state before reset.

  Next, an automotive lamp lighting control method by the ECU 1 will be described. First, as shown in FIG. 5, it is determined whether or not a reset has occurred (step S1). If no reset has occurred (step S1: no), a lighting process by normal communication is performed (step S2). ).

  On the other hand, when a reset occurs (step S1: yes), it is determined whether or not a quick lighting process condition is satisfied (step S3). Here, the sudden lighting process condition is a state in which the ECU 1 recognizes the traveling of the vehicle (for example, the ignition switch SW1 is turned on), and any one of the data holding areas 40A to 40C of the RAM 4 This is a case in which the data stored in is instructed to turn on or off.

  If the sudden lighting process condition is not satisfied (step S3: no), the lighting process by normal communication is performed (step S4). On the other hand, if the sudden lighting process condition is satisfied (step S3: yes), it is determined whether the internal data is not destroyed (step S5). That is, as described above, it is checked whether the data (the same contents) stored in the data holding areas 40A to 40C of the RAM 4 are all the same, and if any data is different from the other data, It is determined that the internal data has been destroyed (step S5: no), and lighting processing by normal communication is performed (step S6).

  On the other hand, if all the data are the same, it is determined that the data in the RAM 4 is not destroyed (step S5: yes), and the content of any one of the data holding areas 40A to 40C is confirmed (step S7). ), If the data does not instruct lighting (step S7: no), lighting processing by normal communication is performed (step S8). On the other hand, if the data indicates lighting, step S7: yes), after reset, it is determined whether communication is received (step S9).

  Here, if communication is received after reset (step S9: no), the lighting process by normal communication will be implemented (step S10). On the other hand, if communication is not received after reset (step S9: yes), as shown in FIG. 4, the lighting process by the rapid lighting process after reset is implemented (step S11).

  In the quick lighting process in step S11, for example, if the lighting process is performed when the above-described ignition switch SW1 is off, the battery will run out, so that the lighting process is unnecessary.

  Thus, in this embodiment, when the ECU 1 is reset, after the initialization process by the CPU 3 is finished, before the lighting instruction data via the network bus 10 is received, immediately before the reset stored in the RAM 4 Since the lighting control of the tail lamp lighting unit 21 is performed by determining whether or not the lighting instruction data is destroyed, it is possible to cause the tail lamp lighting unit 21 to be re-lighted quickly after a reset without causing a malfunction. it can.

  In addition, since the tail lamp lighting unit 21 can be re-lighted quickly without any malfunction, after the reset, the tail lamp can be quickly re-lighted particularly at night. This can be surely notified, and the risk of a rear-end collision by the following vehicle is surely avoided.

  Further, in each of the plurality of data holding areas 40A to 40C in the storage area of the RAM 4, data having the same contents as data (lighting instruction data) for controlling, for example, the lighting operation in the tail lamp lighting unit 21 immediately before the ECU 1 is reset, for example. Since it is memorized and the initialization process is completed, it is confirmed whether or not the data is the same. Therefore, it is surely determined whether or not the data stored in the RAM 4 is destroyed. Can do.

  For example, if the data for controlling, for example, the lighting operation in the tail lamp lighting unit 21 immediately before the reset of the ECU 1 is α, α is stored in the data holding area 40A, and the data holding area 40A is stored in the data holding area 40B. Is stored in the data storage area 40C, and the data holding area 40C stores β in which α is inverted, so that the reliability of data when checking whether the data is the same or not is stored. Can be increased.

  In the present embodiment, a case has been described in which lighting instruction data having the same contents is stored in the data holding areas 40A to 40C, so that a total of three lighting instruction data is stored. Of course, two or four or more instruction data may be stored. In this case, in particular, when four or more lighting instruction data are stored, when each lighting instruction data is confirmed after resetting, for example, when the number of data with the same content exceeds the number of different data, the same It can be confirmed that the content data is not destroyed.

  Further, in the present embodiment, for example, lighting control of the tail lamp lighting unit 21 has been described, but not limited to this example, for example, lighting control of the headlight lighting unit 20 can be performed in the same manner.

  It can also be applied to those that control other than the body system of automobiles.

It is a figure for demonstrating one Example of the lamp lighting control apparatus for motor vehicles of this invention. It is a figure for demonstrating the memory area of RAM of FIG. It is a figure for demonstrating the general lighting control when ECU of FIG. 1 is reset by a certain cause. It is a figure for demonstrating the lighting control in a present Example when ECU of FIG. 1 is reset for a certain cause. 3 is a flowchart for explaining a method for controlling lighting of a vehicle lamp by the ECU of FIG. 1.

Explanation of symbols

1 ECU
2 I / O section (I / O port)
3 CPU (control means)
4 RAM (storage means)
5 ROM
DESCRIPTION OF SYMBOLS 10 Network bus 20 Headlight lighting unit 21 Tail lamp lighting unit 40A-40C Data holding area SW1 Ignition switch SW2 Light control switch

Claims (6)

An automotive lamp lighting control device that is connected to a network bus and performs lighting control of an automotive lamp based on lighting instruction data obtained through the network bus,
Storage means for storing at least the lighting instruction data;
Control means for performing lighting control of the automotive lamp based on the lighting instruction data,
The control means, after resetting and finishing the initialization process, before receiving the lighting instruction data via the network bus, stores the lighting instruction data immediately before the reset stored in the storage means. An automotive lamp lighting control device characterized by determining whether or not the lamp has been destroyed and controlling the lighting of the automotive lamp.   The control means distributes data having the same contents as the lighting instruction data in a storage area of the storage means, stores a plurality of data, and after the initialization process is completed, confirms whether the data is the same. 2. The automotive lamp lighting control device according to claim 1, wherein it is determined whether or not the lighting instruction data is destroyed.   The automotive lamp lighting control device according to claim 2, wherein at least arbitrary data among the plurality of stored data is obtained by inverting the lighting instruction data. An automotive lamp lighting control method that is connected to a network bus and performs lighting control of the automotive lamp based on lighting instruction data obtained through the network bus,
A step of performing lighting control of the automobile lamp based on at least the lighting instruction data stored in the storage means;
After the reset is applied and the initialization process is completed, before the lighting instruction data is received through the network bus, the lighting instruction data immediately before the reset stored in the storage means is not destroyed. And a step of performing lighting control of the vehicle lamp by determining whether or not the vehicle lamp is turned on. A step of storing a plurality of data having the same content as the lighting instruction data in a storage area of the storage means;
The method includes: determining whether the lighting instruction data is not destroyed by checking whether the data is the same after the initialization process is completed. Car lamp lighting control method.   The automotive lamp lighting control method according to claim 5, wherein at least arbitrary data among the plurality of stored data is obtained by inverting the lighting instruction data.

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