JP6183296B2 - Vehicle equipment and method for starting vehicle equipment - Google Patents

Description

  The present invention relates to a vehicle device and a method for starting a vehicle device.

  2. Description of the Related Art An electronic control device (hereinafter referred to as an ECU (Electronic Control Unit)) configured with a microcomputer is widely known as a vehicle device mounted on a vehicle. Such an ECU may be composed of a plurality of microcomputers for the purpose of distributing processing and load. In an ECU having such a plurality of microcomputers, it is necessary to know whether or not the communication state between the microcomputers is normal in order to correctly transmit and receive data between the microcomputers. For this reason, for example, Patent Document 1 proposes an electronic control device that can check whether there is a communication abnormality between the master station and the slave station during normal operation.

JP 2005-61269 A

By the way, when there are a plurality of microcomputers, a startup process is executed in each microcomputer during a predetermined period immediately after the power is turned on, that is, at the time of power-on. Start operation. At this time, it is conceivable that the period required for the startup process differs depending on each microcomputer, and the startup process is not necessarily completed at the same time in all the microcomputers.
For this reason, if data is sent to a microcomputer that has not completed startup processing when the power is turned on, the data that should have been received by the receiving microcomputer during normal operation remains unreceived. There is a risk of being destroyed and lost.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the loss of data in a predetermined period immediately after the power is turned on, and to transmit the data in that period to the communication partner side. An object of the present invention is to provide a vehicle device that can be reliably transmitted to a computer and a method for starting the vehicle device.

In the first aspect of the present invention, the vehicular device includes a plurality of microcomputers that are communicably connected to each other, and the plurality of microcomputers communicate with the communication partner side in a predetermined period immediately after the power is turned on. The data to be transmitted to the microcomputer on the other end of the communication is kept until the microcomputer can be confirmed to be activated, and if the activation of the microcomputer on the other end of the communication is confirmed, the retained data is Send automatically. As a result, it is possible to prevent data loss during a predetermined period immediately after the power is turned on. Further, since the stored data is automatically transmitted, the data can be reliably transmitted to the microcomputer on the communication partner side.
Data can be reliably transmitted to the microcomputer on the communication partner side.

The figure which shows typically the electric constitution of the apparatus for vehicles by one Embodiment. The figure which shows typically the flow of the process at the time of power activation of the apparatus for vehicles The figure which shows an example of the transmission and reception timing of the data at the time of power activation

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, an ECU 1 (Electronic Control Unit) corresponding to the vehicle device of the present embodiment is mounted on a vehicle (not shown), and other ECUs 3 and ECUs 4 mounted on the vehicle via an in-vehicle LAN 2. The ECU 5 and the like are communicably connected. The in-vehicle LAN 2 is assumed to be a known one such as a CAN (Controller Area Network). Various types of ECUs such as an engine ECU, a meter ECU, and an air conditioning ECU exist in the vehicle, but the present invention can be applied regardless of the type of ECU.
The ECU 1 includes a first microcomputer 10 and a second microcomputer 11 that is communicably connected to the first microcomputer 10. In addition, although illustration is abbreviate | omitted in FIG. 1, ECU1 is provided with the power supply circuit and the peripheral circuit.

  The first microcomputer 10 is connected to the in-vehicle LAN 2 and has a relay function for relaying data transmitted from the in-vehicle LAN 2 to the second microcomputer 11. The second microcomputer 11 receives data transmitted from the in-vehicle LAN 2 via the first microcomputer 10. The first microcomputer 10 and the second microcomputer 11 are communicably connected by so-called microcomputer communication using, for example, serial communication or a shared memory. In the present embodiment, the first microcomputer 10 controls the activation of the second microcomputer 11.

  Data is transmitted to the second microcomputer 11 from the other ECUs 3 to 5 to the ECU 1 having such a configuration. The data is received by the first microcomputer 10 and then transmitted to the second microcomputer 11. At this time, the other ECU3 to ECU5 are activated independently of the ECU1. Therefore, the other ECUs 3 to 5 do not check the state of the second microcomputer 11 regardless of the activation state of the second microcomputer 11 provided in the ECU 1. Send data.

At this time, in a state where the activation of the second microcomputer 11 has not been completed, even if the first microcomputer 10 transmits the data received from the other ECU3 to ECU5 to the second microcomputer 11, the second microcomputer 11 The microcomputer 11 cannot receive the data. As a result, data transmitted from the other ECUs 3 to 5 (hereinafter referred to as data received from the in-vehicle LAN 2 side) may be discarded without being received by the second microcomputer 11 and lost.
Therefore, in the ECU 1 according to the present embodiment, the first microcomputer 10 checks the data received from the in-vehicle LAN 2 side during the predetermined period immediately after the power is turned on until the activation of the second microcomputer 11 can be confirmed. Keep holding.

  Specifically, when the first microcomputer 10 is turned on, it first initializes itself, and then performs start-up control of the second microcomputer 11 as shown in FIG. 2 (S1). ). At this time, the first microcomputer 10 performs, for example, control for canceling the reset state of the second microcomputer 11 in order to activate the second microcomputer 11. If the activation of the second microcomputer 11 is controlled from the first microcomputer 10, the activation is controlled by another method such as starting the supply of power to the second microcomputer 11. Also good.

When activation control is performed from the first microcomputer 10, the second microcomputer 11 starts activation by executing an initialization process or the like, and the activation is completed when the initialization process is completed. Become.
Subsequently, as shown in FIG. 2, the first microcomputer 10 determines whether or not activation has been confirmed (S2). The process in step S2 corresponds to an activation confirmation process. At this time, as shown in FIG. 3, the first microcomputer 10 confirms the activation of the second microcomputer 11 when the activation of the first microcomputer 10 is completed. In the present embodiment, the first microcomputer 10 transmits an activation confirmation inquiry to the second microcomputer 11 and receives the reply to the inquiry, whereby the second microcomputer 11 is activated. judge.

In this embodiment, since the inquiry for the activation confirmation is performed by the communication between the microcomputers, if the reply to the inquiry for the activation confirmation can be confirmed, it can be simultaneously confirmed that the communication between the microcomputers is operating normally.
By the way, the first microcomputer 10 is ready to receive data from the in-vehicle LAN 2 side when the activation is completed. On the other hand, since the second microcomputer 11 starts starting after the first microcomputer 10 is started, the start is completed later than the first microcomputer 10. For this reason, even if the first microcomputer 10 can receive data from the in-vehicle LAN 2 side, there may be a period during which the second microcomputer 11 cannot receive the data.

  Therefore, as shown in FIG. 2, the first microcomputer 10 receives data from the in-vehicle LAN 2 side when the activation of the second microcomputer 11 has not been confirmed (S2: NO) ( (S8: YES), the received data is stored in the reception buffer (S9). The reception buffer may be configured to use a RAM or the like included in the first microcomputer 10 or may be configured to provide a dedicated reception buffer in the ECU 1 or the first microcomputer 10.

Specifically, as shown in FIG. 3, when the first microcomputer 10 receives data (D1) from the in-vehicle LAN 2 side before the activation of the second microcomputer 11 can be confirmed, the first microcomputer 10 temporarily stores the data. Keep it by memorizing it. On the other hand, if the first microcomputer 10 has not received data from the in-vehicle LAN 2 side (S8: NO), the first microcomputer 10 proceeds to step S2 and continues the activation confirmation. Further, when the first microcomputer 10 receives new data (D2) from the in-vehicle LAN 2 side before the activation of the second microcomputer 11 can be confirmed, the first microcomputer 10 continues to hold the data (D2).
When the first microcomputer 10 receives a reply to the activation confirmation inquiry from the second microcomputer 11, it determines that the activation of the second microcomputer 11 has been confirmed as shown in FIG. 2 (S2). : YES)

  When the first microcomputer 10 can confirm the activation of the second microcomputer 11, that is, upon receiving a response to the activation confirmation inquiry (activation reception), the first microcomputer 10 determines whether or not there is data in the reception buffer ( S3). When there is data in the reception buffer (S3: YES), the first microcomputer 10 automatically transmits the data (D1, D2) to the second microcomputer 11 (S4). The processes in steps S3 and S4 and steps S8 and S9 described above correspond to the data holding process.

  At this time, when the first microcomputer 10 receives the reception confirmation of the data (D1) from the second microcomputer 11, the first microcomputer 10 deletes the data (D1) from the reception buffer. Similarly, when the first microcomputer 10 transmits the data (D2) stored in the reception buffer, the first microcomputer 10 receives the data (D2) reception confirmation from the second microcomputer 11 and receives the data (D2). ) Is deleted from the receive buffer. In the case of the present embodiment, it is not always essential to receive a data reception confirmation after data transmission.

  As described above, in the ECU 1 according to the present embodiment, the start-up of the second microcomputer 11 that is a predetermined period immediately after the power is turned on, that is, the data transmission destination is completed, and the second microcomputer 11 receives the data. In the period until the first microcomputer 10 can be received, the first microcomputer 10 continues to hold data to be transmitted to the second microcomputer 11.

  The period after the start of the second microcomputer 11 is a so-called normal operation period. Therefore, as shown in FIG. 2 and FIG. 3, when the first microcomputer 10 receives new data (D3) from the in-vehicle LAN 2 side (S6: YES), the data (D3 ) Is transmitted to the second microcomputer 11 (S7). Then, for example, when the power is turned off (S10: YES), the first microcomputer 10 ends the processing shown in FIG.

According to ECU1 of this embodiment demonstrated above, the following effects can be acquired.
The ECU 1 as a vehicle device includes a first microcomputer 10 and a second microcomputer 11 that are connected to be communicable with each other. At this time, in a predetermined period immediately after the power is turned on, the first microcomputer 10 transmits to the second microcomputer 11 until the activation of the second microcomputer 11 serving as the communication partner side can be confirmed. If the activation of the second microcomputer 11 can be confirmed, the held data is automatically transmitted. As a result, it is possible to prevent the data from being lost in a predetermined period immediately after the power is turned on, that is, the data is not discarded without being transmitted to the other party. Further, since the data is automatically transmitted to the second microcomputer 11 which is the communication counterpart side, the data can be reliably transmitted to the microcomputer of the communication counterpart side.

  The ECU 1 is connected to the in-vehicle LAN 2, and the first microcomputer 10 that transmits data transmitted from the other ECU 3 to ECU 5 that starts independently of the ECU 1 to the second microcomputer 11, and the first microcomputer 1. The second microcomputer 11 is communicably connected to the microcomputer 10 and receives data transmitted from the first microcomputer 10. In this case, the other ECU3 to ECU5 cannot confirm the activation state of the ECU1, more strictly the activation state of the second microcomputer 11.

  Therefore, even if the second microcomputer 11 cannot receive data, data may be transmitted from the other ECU 3 to ECU 5, but the first microcomputer 10 uses the second microcomputer 11. By continuing to hold the data to be transmitted to the terminal, it is possible to prevent data loss during a predetermined period immediately after the power is turned on.

  The ECU 1 includes a first microcomputer 10 and a second microcomputer 11 that are communicably connected to each other, and is a microcomputer that becomes a communication partner in a predetermined period immediately after the power is turned on. An activation method including an activation confirmation process for confirming activation of the (second microcomputer 11) and a data holding process for retaining data to be transmitted until the activation of the microcomputer on the communication partner side can be confirmed by the activation confirmation process. Adopted. As a result, it is possible to prevent data loss during a predetermined period immediately after the power is turned on as described above.

(Other embodiments)
The present invention is not limited to those exemplified in the above-described embodiments, and can be arbitrarily modified or expanded without departing from the scope thereof.
In one embodiment, the activation confirmation inquiry is transmitted to the second microcomputer 11, but the activation confirmation may be performed by transmitting data. In that case, when the second microcomputer 11 receives the data, the second microcomputer 11 notifies the first microcomputer 10 that the data has been received. Specifically, when the first microcomputer 10 receives data to be transmitted to the second microcomputer 11 from the in-vehicle LAN 2 side in a predetermined period immediately after the power is turned on, the activation shown in FIG. The confirmation inquiry is executed by transmitting the received data to the second microcomputer 11 as the transmission destination. Then, the first microcomputer 10 determines that the activation of the second microcomputer 11 has been confirmed upon receiving the notification that the data has been received from the second microcomputer 11. Even with such a configuration, it is possible to prevent data loss during a predetermined period immediately after the power is turned on.

  In the embodiment, the configuration in which one second microcomputer 11 is provided is illustrated. However, the present invention may be applied to a configuration in which a plurality of second microcomputers 11 are connected to the first microcomputer 10. Can be applied. In that case, the first microcomputer 10 may perform the activation confirmation as in the embodiment and the activation confirmation by the data transmission described above for each second microcomputer 11.

  In the drawings, 1 is an ECU (vehicle equipment), 2 is an in-vehicle LAN, 3 to 5 are ECUs (other vehicle equipment), 10 is a first microcomputer (microcomputer), and 11 is a second microcomputer ( Microcomputer).

Claims (2)

A plurality of microcomputers (10, 11) connected to be communicable with each other;
The plurality of microcomputers (10, 11) are connected to the communication partner side microcomputer (10) until activation of the communication partner side microcomputer (10, 11) can be confirmed in a predetermined period immediately after the power is turned on. 11), the data to be transmitted to the communication partner side is continuously held, and if the activation of the microcomputer (10, 11) on the communication partner side can be confirmed, the held data is automatically transmitted ,
The plurality of microcomputers (10, 11) are connected to the in-vehicle LAN (2) and transmitted from other vehicle devices (3, 4, 5) that start independently of the vehicle device (1). The first microcomputer (10) for transmitting the received data to the other microcomputer (11) and the first microcomputer (10) are communicably connected to the first microcomputer (10) and transmitted from the first microcomputer (10). A second microcomputer (11) for receiving the processed data,
The first microcomputer (10) is in a predetermined period immediately after the power is turned on until the second microcomputer (11) as a data transmission destination can be confirmed to be activated. When data to be transmitted to the second microcomputer (11) is received from the in-vehicle LAN (2) side during a predetermined period immediately after the power is turned on while the data to be transmitted to the computer (11) is kept Sends the received data to the second microcomputer (11) as the transmission destination and returns a notification that the data has been received from the second microcomputer (11) as the transmission destination. Therefore, it is determined that the activation of the second microcomputer (11) has been confirmed . In the vehicle device (1) including a plurality of microcomputers (10, 11) connected to each other so as to communicate with each other,
An activation confirmation process for confirming the activation of the microcomputer (10, 11) on the communication partner side in a predetermined period immediately after the power is turned on;
A data holding process for holding data to be transmitted until the activation of the microcomputer (10, 11) on the communication partner side can be confirmed in the activation confirmation process,
The plurality of microcomputers (10, 11) are connected to the in-vehicle LAN (2) and transmitted from other vehicle devices (3, 4, 5) that start independently of the vehicle device (1). The first microcomputer (10) for transmitting the received data to the other microcomputer (11) and the first microcomputer (10) are communicably connected to the first microcomputer (10) and transmitted from the first microcomputer (10). A second microcomputer (11) for receiving the processed data,
The first microcomputer (10) is in a predetermined period immediately after the power is turned on until the second microcomputer (11) as a data transmission destination can be confirmed to be activated. When data to be transmitted to the second microcomputer (11) is received from the in-vehicle LAN (2) side during a predetermined period immediately after the power is turned on while the data to be transmitted to the computer (11) is kept Sends the received data to the second microcomputer (11) as the transmission destination and returns a notification that the data has been received from the second microcomputer (11) as the transmission destination. It is determined that the activation of the second microcomputer (11) has been confirmed. Method.

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