WO2017099006A1

WO2017099006A1 - Electronic control device

Info

Publication number: WO2017099006A1
Application number: PCT/JP2016/085845
Authority: WO
Inventors: 齋藤　剛
Original assignee: 日本精機株式会社
Priority date: 2015-12-09
Filing date: 2016-12-02
Publication date: 2017-06-15
Also published as: JPWO2017099006A1; JP6888554B2

Abstract

The objective of the present invention is to provide an electronic control device with which it is possible to limit power consumption during a period in which a vehicle-mounted device is operating in an operating mode in which the vehicle-mounted device does not need to communicate with another vehicle-mounted device or the like but does need to be controlled. An electronic control device 10 is provided with: a control unit 20 which includes a communication processing control unit 26 for controlling communications that use a certain protocol, and which controls the operation of the communication processing control unit 26 and the operation of at least one vehicle-mounted device 40; and a transmitting and receiving unit 30 provided between the communication processing control unit 26 and a communication line 60. The communication processing control unit 26 is capable of transitioning between operating modes, namely a normal mode in which a signal received from the communication line 60 is output to the control unit 20, and a power-saving mode in which a signal received from the communication line 60 is not output to the control unit 20. The control unit 20 causes the operating mode of the communication processing control unit 26 to transition from the normal mode to the power-saving mode upon receipt of a first signal.

Description

Electronic control unit

The present invention relates to an electronic control device. In particular, the present invention relates to an electronic control device that is mounted on a vehicle and can communicate with another electronic control device, and has an operation mode that suppresses power consumption.

The vehicle is equipped with a plurality of electronic control units (ECUs) for controlling a plurality of in-vehicle devices. The plurality of ECUs are connected to the communication line so that signals can be transmitted and received with each other via the communication line. As a protocol used for communication related to this transmission / reception, for example, there is a CAN (Controller Area Network) protocol.

The number of ECUs mounted on vehicles is increasing for higher functionality and improved safety of in-vehicle devices. Therefore, what has an operation mode which suppresses the power consumption of ECU when the control of the vehicle-mounted apparatus which is the control object of ECU is unnecessary is known.

As an example of such an ECU, for example, Patent Document 1 discloses a communication processing control unit that is a CAN controller that controls communication according to a CAN protocol, and a microcomputer that controls the operation of the communication processing control unit. Provided between the control unit, the communication processing control unit and the communication path (communication line), transmits a signal input from the communication processing control unit to the communication line and outputs a signal received from the communication line to the communication processing control unit An ECU including a transmission / reception unit is shown. Further, the ECU shown in Patent Literature 1 includes a control unit between a normal mode when controlling an on-vehicle device that is a control target and a sleep mode (power saving mode) that stops the operation of the control unit itself. The operation mode can be shifted.

JP 2012-165257 A JP 2010-158995 A

By the way, some in-vehicle devices do not require communication with other in-vehicle devices connected to the communication line, sensors, and the like, but have an operation mode in which control of the in-vehicle device itself is necessary. For example, the vehicular instrument disclosed in Patent Document 2 can perform an ending effect by controlling the liquid crystal display panel and the light source when the ignition switch of the vehicle changes from an on state to an off state. That is, in the vehicle instrument shown in Patent Document 2, during execution of an ending effect performed when the ignition switch of the vehicle changes from the on state to the off state, communication with other in-vehicle devices, sensors, etc. While not necessary, control of the vehicle instrument itself is a necessary mode of operation.

Assuming that the operation of such a vehicle-mounted device is controlled by an ECU as shown in Patent Document 1, communication with other vehicle-mounted devices, sensors, etc. is not necessary, but control of the vehicle-mounted device itself is necessary. The inventor has recognized that the operation mode of the control unit cannot be shifted to the power saving mode while the in-vehicle device is operating in the operation mode. Thus, in the ECU shown in Patent Document 1, the present inventor has recognized that there is room for improvement in terms of suppressing power consumption related to control of an in-vehicle device that is a control target.

One object of the present invention is to suppress power consumption while an in-vehicle device is operating in an operation mode in which the in-vehicle device does not need to communicate with other in-vehicle devices or the like, but control of the in-vehicle device itself is necessary. An object of the present invention is to provide an electronic control device that can perform the above-described operation. Other objects of the present invention will become apparent to those skilled in the art by referring to the aspects and preferred embodiments exemplified below and the accompanying drawings.

A first aspect according to the present invention includes a communication processing control unit that controls communication according to a predetermined protocol, and a control unit that controls the operation of the communication processing control unit and the operation of at least one in-vehicle device;
Provided between the communication processing control unit and the communication line, transmits the signal input from the communication processing control unit to the communication line and outputs the signal received from the communication line to the communication processing control unit A transmission / reception unit,
An electronic control device comprising:
The communication processing control unit operates between a normal mode in which the signal received from the communication line is output to the control unit and a power saving mode in which the signal received from the communication line is not output to the control unit. Mode transition is possible,
The control unit relates to an electronic control device that shifts the operation mode of the communication processing control unit from the normal mode to the power saving mode in response to a first signal received from the outside of the electronic control device.

The electronic control device according to the first aspect can shift the operation mode of the communication processing control unit to the power saving mode, not the entire control unit (microcomputer) of the electronic control device. Therefore, the electronic control device according to the first aspect can control the operation of the in-vehicle device that is the control target even after the operation mode of the communication processing control unit is shifted to the power saving mode.

For example, the in-vehicle device that is the control target of the electronic control device according to the first aspect does not need to communicate with other in-vehicle devices, sensors, and the like connected to the communication line, but the in-vehicle device itself needs to be controlled. Suppose that it operates in a certain mode of operation. At this time, the electronic control device according to the first aspect can suppress power consumption of the electronic control device as compared with an electronic control device capable of shifting the operation mode of only the entire control unit to the power saving mode, for example.

In a second aspect according to the present invention, in the first aspect, the power saving mode of the communication processing control unit is the communication processing control unit when the communication processing control unit receives a second signal from the communication line. The first power saving mode in which the operation mode is shifted to the normal mode.

In the first power saving mode, when the communication processing control unit receives the second signal, for example, the setting unit of the communication processing control unit is not rewritten by the control unit, and the operation mode of the communication processing control unit is the first power saving mode. The mode can be changed to the normal mode.

In a third aspect according to the present invention, in the first aspect, the power saving mode of the communication processing control unit is configured such that the communication processing control unit receives the second signal from the communication line. Even if the operation mode does not shift to the normal mode and the operation mode is set by the control unit, the operation mode of the communication processing control unit is a second power saving mode in which the operation mode shifts to the normal mode. Good.

In the second power saving mode, when the setting register of the communication processing control unit is rewritten by the control unit, the operation mode of the communication processing control unit can shift from the second power saving mode to the normal mode.

In a fourth aspect according to the present invention, in the third aspect, the control unit may have an input terminal directly connected to the transmission / reception unit.

The control unit has an input terminal directly connected to the transmission / reception unit, thereby controlling that the second signal is received from the communication line when the operation mode of the communication processing control unit is the second power saving mode. Department can grasp.

In a fifth aspect according to the present invention, in the first to fourth aspects, the control unit has changed the operation mode of the communication processing control unit from the normal mode to the power saving mode, When a predetermined condition is satisfied, the operation mode of the control unit may be shifted from the normal mode to the power saving mode.

After the operation mode of the communication processing control unit shifts from the normal mode to the power saving mode, when a predetermined condition is satisfied, the operation mode of the control unit shifts from the normal mode to the power saving mode. The power consumption can be further reduced. In addition, by shifting to the power saving mode at the timing when each operation mode in the control unit and the communication processing control unit can shift to the power saving mode, the degree of suppression of power consumption as a whole electronic control device is increased step by step. Can do.

It is a block diagram which shows the example of a structure of the vehicle-mounted network to which the electronic control apparatus of 1st Embodiment of this invention is connected. It is a flowchart figure which shows the example of operation | movement of an electronic control apparatus when the operation mode of the communication process control part of the electronic control apparatus shown by FIG. 1 transfers to a sleep mode from a normal mode. It is a flowchart figure which shows the example of operation | movement of an electronic control apparatus when the operation mode of the communication process control part of the electronic control apparatus shown by FIG. 1 transfers to a normal mode from a sleep mode. It is a block diagram which shows the example of a structure of the vehicle-mounted network to which the electronic control apparatus of 2nd Embodiment of this invention is connected. FIG. 5 is a flowchart showing an example of the operation of the electronic control device when the operation mode of the communication processing control unit of the electronic control device shown in FIG. 4 shifts from the normal mode to the stop mode. FIG. 5 is a flowchart showing an example of the operation of the electronic control device when the operation mode of the communication processing control unit of the electronic control device shown in FIG. 4 shifts from the stop mode to the normal mode.

The preferred embodiments described below are used to facilitate understanding of the present invention. Accordingly, those skilled in the art should note that the present invention is not unduly limited by the embodiments described below.

<< First Embodiment >>
A first embodiment of an electronic control unit (ECU) 10 of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. 1 shows an example of a configuration of a CAN (Controller Area Network) network as an example of an in-vehicle network to which the ECU 10 according to the first embodiment of the present invention is connected. The communication line 60 in the example of the in-vehicle network shown in FIG. 1 includes a CAN-H line 60-H and a CAN-L line 60-L.

A plurality of ECUs 10 (10-1, 10-2, 10-3) are connected to the communication line 60. The plurality of ECUs 10 can transmit / receive signals to / from other ECUs 10 (for example, ECUs 10-2 and 10-3 with respect to the ECU 10-1) via the communication line 60. For example, the plurality of ECUs 10 can share control data of the corresponding on-vehicle device 40 to be controlled with other ECUs 10.

An example of the configuration of the ECU 10-1 is shown as the configuration of the plurality of ECUs 10. The ECU 10 includes a control unit 20 and a transmission / reception unit 30. The control unit 20 includes, for example, a microcomputer, and includes at least a processing unit 21 that is, for example, a CPU (Central Processing Unit) and a communication processing control unit 26 that is, for example, a CAN controller. The control unit 20 also includes a rewritable RAM (Random Access Memory), a read-only ROM (Read Only Memory), a non-erasable program read-only EEPROM (Electrically-Erasable Programmable Read-Only Memory), non-volatile You may further provide the memory | storage part comprised by 1 or several memory which can memorize | store a program and / or data, such as flash memory which is volatile memory.

The processing unit 21 of the control unit 20 can control the operation of at least one in-vehicle device 40 that is a control target. Examples of the in-vehicle device 40 include a safety device such as a meter, an air conditioner, an audio device, a navigation device, and a skid prevention device (ESC: Electronic Stability Control). Further, the processing unit 21 can control the operation of the communication processing control unit 26.

The communication processing control unit 26 includes a transmission terminal TX and a reception terminal RX, and controls communication according to the CAN protocol. For example, the communication processing control unit 26 can output a signal generated by the processing unit 21 from the transmission terminal TX to the transmission / reception unit 30 under the control of the processing unit 21. Further, the communication processing control unit 26 can output, for example, a signal received from the transmission / reception unit 30 to the processing unit 21.

Further, the communication processing control unit 26 performs communication between the normal mode in which the signal received from the transmission / reception unit 30 is output to the processing unit 21 and the power saving mode in which the signal received from the transmission / reception unit 30 is not output to the processing unit 21. The operation mode of the process control unit 26 can be shifted. When the operation mode of the communication processing control unit 26 is the power saving mode, for example, an operation clock generated by a clock generation circuit (not shown) of the control unit 20 is not supplied to the communication processing control unit 26. That is, when the operation mode of the communication processing control unit 26 is the power saving mode, the ECU 10 (10-1) communicates with the other ECUs 10 (10-2, 10-3) via the communication line 60. The communication function is stopped.

The transmission / reception unit 30 is, for example, a CAN transceiver provided between the communication processing control unit 26 and the communication line 60. The transmission / reception unit 30 converts the signal received from the control unit 20, that is, the communication processing control unit 26, into an electrical signal that conforms to the physical layer standard of the CAN protocol, and transmits the signal to the communication line 60 as a CAN message. In addition, the transmission / reception unit 30 converts the CAN message received from the communication line 60 into an electrical signal and outputs it to the control unit 20, that is, the communication processing control unit 26.

Further, the transmission / reception unit 30 has a standby pin STB, and the operation mode of the transmission / reception unit 30 transitions between the normal mode and the standby mode in accordance with a standby signal received from the processing unit 21 of the control unit 20. That is, when the transmission / reception unit 30 receives the standby signal Hi from the processing unit 21 at the standby pin STB, the operation mode shifts from the normal mode to the standby mode. Similarly, when the transmission / reception unit 30 receives the standby signal Lo from the processing unit 21 at the standby pin STB, the operation mode shifts from the standby mode to the normal mode.

When the operation mode of the transmission / reception unit 30 is the standby mode, the power consumption in the transmission / reception unit 30 can be suppressed as compared to the normal mode. On the other hand, when the operation mode of the transmission / reception unit 30 is the standby mode, for example, the time required for the electric signal conversion in the transmission / reception unit 30 is longer than that in the normal mode.

The ECU 10 can shift the operation mode of the communication processing control unit 26 to the power saving mode instead of the entire control unit 20. Therefore, ECU10 can control operation | movement of the vehicle equipment 40 which is a control object, after changing the operation mode of the communication process control part 26 to power saving mode.

For example, the vehicle-mounted device 40 that is the control target of the ECU 10 does not need to communicate with other vehicle-mounted devices or sensors connected to the communication line 60, while the vehicle-mounted device 40 itself needs to be controlled. Suppose it works. At this time, the ECU 10 can suppress the power consumption of the ECU 10, for example, by comparing the operation mode of only the entire control unit 20 (or the processing unit 21) with an ECU capable of shifting to the power saving mode.

The operation of the ECU 10 in the first embodiment will be described with reference to FIGS. First, an example of an operation in which the operation mode of the communication processing control unit 26 of the ECU 10 in the first embodiment shifts from the normal mode to the power saving mode will be described with reference to the flowchart shown in FIG. In the first embodiment, the sleep mode (first power saving mode) is adopted as the power saving mode. The sleep mode will be described in detail with reference to the flowchart shown in FIG.

2, in step S <b> 101 of the flowchart shown in FIG. 2, the transmission / reception unit 30 of the ECU 10 receives the CAN message including the first signal from the communication line 60. The first signal is a signal including, for example, an instruction to shift the operation mode of the communication processing control unit 26 of the one or more ECUs 10 from the normal mode to the power saving mode (sleep mode). Further, the first signal may be, for example, a signal including that an ignition switch (not shown) has changed from an on state to an off state.

In step S102, the transmission / reception unit 30 outputs the first signal included in the CAN message received in step S101 to the reception terminal RX of the communication processing control unit 26 of the control unit 20.

In step S103, the communication processing control unit 26 outputs the first signal received in step S102 to the control unit 20, specifically, the processing unit 21 of the control unit 20.

In step S104, the processing unit 21 of the control unit 20 switches the standby signal output to the standby pin STB of the transmission / reception unit 20 from the standby signal Lo to the standby signal Hi according to the first signal received in step S103.

In step S105, the processing unit 21 of the control unit 20 responds to the first signal received in step S103 so that the operation mode of the communication processing control unit 26 shifts from the normal mode to the sleep mode. Rewrite the setting register.

In step S106, the operation mode of the transmission / reception unit 30 shifts from the normal mode to the standby mode in accordance with the standby signal Hi received by the transmission / reception unit 30 in step S104.

In step S107, when the setting register of the communication processing control unit 26 is rewritten in step S105, the operation mode of the communication processing control unit 26 shifts from the normal mode to the sleep mode.

In the flowchart shown in FIG. 2, the processing unit 21 of the control unit 20 receives the first signal received from the communication line 60 by the transmission / reception unit 30 via the communication processing control unit 26 (step S101, step S101). S102 and step S103). However, alternatively, the processing unit 21 of the control unit 20 may receive the first signal directly from, for example, an ignition switch (not shown).

In the flowchart shown in FIG. 2, the order of the process of step S104 and the process of step S105 may be interchanged. Similarly, the process of step S106 and the process of step S107 may be interchanged.

Subsequently, an example of an operation in which the operation mode of the communication processing control unit 26 of the ECU 10 in the first embodiment shifts from the power saving mode (sleep mode) to the normal mode will be described with reference to the flowchart illustrated in FIG. 3. To do. The description with reference to the flowchart shown in FIG. 3 will be made as a continuation of the flowchart shown in FIG. That is, the operation mode of the communication processing control unit 26 is a sleep mode, and the operation mode of the transmission / reception unit 30 is a standby mode.

In step S108 of the flowchart shown in FIG. 3, the transmission / reception unit 30 of the ECU 10 receives the first frame of the CAN message including the second signal from the communication line 60. The second signal is, for example, a signal including an instruction to shift the operation mode of the communication processing control unit 26 of one or more ECUs 10 from the power saving mode (sleep mode) to the normal mode. Further, the second signal may be, for example, control data of the in-vehicle device controlled by another ECU transmitted from another ECU connected to the communication line 60. Furthermore, the second signal may be, for example, a signal including that an ignition switch (not shown) has changed from an off state to an on state.

In step S109, the transmission / reception unit 30 outputs the second signal received in step S108 to the reception terminal RX of the communication processing control unit 26 of the control unit 20.

In step S110, the operation mode of the communication processing control unit 26 shifts from the sleep mode to the normal mode by the second signal received by the communication processing control unit 26. That is, in the sleep mode that is the first power saving mode, when the communication processing control unit 26 receives the second signal, for example, the setting register of the communication processing control unit 26 does not need to be rewritten by the processing unit 21 of the control unit 20. The operation mode of the communication processing control unit 26 is changed from the sleep mode to the normal mode.

In step S111, for example, the communication processing control unit 26 outputs a wakeup signal indicating that the operation mode of the communication processing control unit 26 has shifted from the sleep mode to the normal mode to the processing unit 21 of the control unit 20.

In step S112, the processing unit 21 of the control unit 20 switches the standby signal output to the standby pin STB of the transmission / reception unit 20 from the standby signal Hi to the standby signal Lo according to the wakeup signal received in step S111.

In step S113, the processing unit 21 of the control unit 20 rewrites the setting register of the communication processing control unit 26 so that the operation mode of the communication processing control unit 26 shifts from the normal mode to the initialization mode.

In step S114, the operation mode of the transmission / reception unit 30 shifts from the standby mode to the normal mode in accordance with the standby signal Lo received by the transmission / reception unit 30 in step S112.

In step S115, the transmission / reception unit 30 receives the termination frame of the CAN message including the second signal from the communication line 60. In step S116, the transmission / reception unit 30 outputs to the reception terminal RX of the communication processing control unit 26 of the control unit 20 that the termination frame of the CAN message including the second signal is received in step S115.

In step S117, after waiting for one frame of the CAN message including the second signal to end, the communication processing control unit 26 shifts the operation mode of the communication processing control unit 26 from the normal mode to the initialization mode. In step S118, after the initialization process in the initialization mode of the communication process control unit 26 is completed, the operation mode of the communication process control unit 26 shifts from the initialization mode to the normal mode.

Here, when the operation mode of the communication processing control unit 26 shifts from the normal mode to the initialization mode in step S117, the operation mode of the communication processing control unit 26 is changed from the power saving mode (first power saving mode) to the normal mode. The normal operation of the communication processing control unit 26 after returning can be ensured. For example, even if an abnormality occurs in the setting register of the communication processing control unit 26 due to some trouble or failure while the operation mode of the communication processing control unit 26 is the power saving mode, the initialization process in the initialization mode This incident is resolved.

However, the initialization process in the initialization mode is not necessarily required, and the initialization process in the initialization mode may be omitted. In this case, for example, in the flowchart shown in FIG. 3, the processes of step S113, step S117, and step S118 may be omitted.

<< Second Embodiment >>
A second embodiment of the ECU 10 of the present invention will be described with reference to FIGS. 4, 5 and 6. 2nd Embodiment of ECU10 of this invention is a modification of 1st Embodiment mentioned above. Therefore, in the description of the second embodiment, only parts different from the first embodiment will be described, and description of similar parts will be omitted. Moreover, the same code | symbol as the code | symbol used for description of 1st Embodiment is used for the component which is common in 1st Embodiment.

FIG. 4 shows an example of the configuration of a CAN network to which the ECU 10 according to the second embodiment of the present invention is connected. In the second embodiment, the processing unit 21 of the control unit 20 of the ECU 10 further includes an interrupt terminal 23. The transmission / reception unit 30 and the communication processing control are performed so that the signal output from the transmission / reception unit 30 to the reception terminal RX of the communication processing control unit 26 is also output to the interrupt terminal 23 of the processing unit 21 of the control unit 20. A connection line connecting the receiving terminal RX of the unit 26 is branched and connected to the processing unit 21.

The operation of the ECU 10 in the second embodiment will be described with reference to FIGS. First, an example of an operation in which the operation mode of the communication processing control unit 26 of the ECU 10 in the second embodiment shifts from the normal mode to the power saving mode will be described with reference to the flowchart shown in FIG. In the second embodiment, a stop mode (second power saving mode) is adopted as the power saving mode. The stop mode will be described in detail with reference to the flowchart shown in FIG. In the flowcharts shown in FIGS. 5 and 6, only the parts different from the flowcharts shown in FIGS. 2 and 3 will be described, and the same parts will be described with the corresponding relationship and the description will be omitted.

Step S201 shown in FIG. 5 corresponds to step S101 shown in FIG. Step S202 corresponds to step S102. Step S203 corresponds to step S103. Step S204 corresponds to step S104. Step S205 corresponds to step S105. Step S206 corresponds to step S106. Step S207 corresponds to step S107.

In step S208, the processing unit 21 of the control unit 20 further rewrites the setting register of the communication processing control unit 26 so that the operation mode of the communication processing control unit 26 shifts from the sleep mode to the stop mode.

In step S209, when the setting register of the communication processing control unit 26 is rewritten in step S208, the operation mode of the communication processing control unit 26 shifts from the sleep mode to the stop mode.

In the flowchart shown in FIG. 5, after the operation mode of the communication processing control unit 26 shifts from the normal mode to the sleep mode, the sleep mode further shifts to the stop mode. However, depending on the specifications of the control unit (microcomputer) 20, the operation mode of the communication processing control unit 26 may shift directly from the normal mode to the stop mode. In this case, in the flowchart shown in FIG. 5, for example, the process of step S208 may be executed instead of the process of step S205, and the process of step S209 may be executed instead of the process of step S207.

Next, an example of an operation in which the operation mode of the communication processing control unit 26 of the ECU 10 in the second embodiment shifts from the power saving mode (stop mode) to the normal mode will be described with reference to the flowchart shown in FIG. To do. The description with reference to the flowchart shown in FIG. 6 will be made as a continuation of the flowchart shown in FIG. That is, the operation mode of the communication processing control unit 26 is a stop mode, and the operation mode of the transmission / reception unit 30 is a standby mode.

Step S210 shown in FIG. 6 corresponds to step S108 shown in FIG. Step S211 corresponds to step S109.

However, in the ECU 10 in the second embodiment, the operation mode of the communication processing control unit 26 does not shift from the stop mode to the normal mode in response to the output of the second signal to the communication processing control unit 26 in step S211. That is, in the ECU 10 in the second embodiment, the stop mode is continued as the operation mode of the communication processing control unit 26 at the stage where the second signal is output to the communication processing control unit 26 in step S211.

In step S212, the second signal output from the transmission / reception unit 30 to the reception terminal RX of the communication processing control unit 26 in step S211 is input to the interrupt terminal 23 of the processing unit 21 of the control unit 20. In other words, the second signal output in step S211 is processed by the control unit 20 through the connection line branched from the connection line connecting the transmission / reception unit 30 and the reception terminal RX of the communication processing control unit 26. Input to the interrupt terminal 23 of the unit 21.

Step S213 corresponds to step S112. However, in step S213, the standby signal output to the standby pin STB of the transmission / reception unit 20 is not received from the standby signal Hi in accordance with the second signal received from the transmission / reception unit 30 in step S212, not according to the wake-up signal. Switch to standby signal Lo. Step S215 corresponds to step S114.

In step S214, the processing unit 21 of the control unit 20 sets the setting register of the communication processing control unit 26 so that the operation mode of the communication processing control unit 26 returns from the stop mode, that is, shifts from the stop mode to the sleep mode. Rewrite. In step S216, when the setting register of the communication processing control unit 26 is rewritten in step S214, the operation mode of the communication processing control unit 26 shifts from the stop mode to the sleep mode.

In step S217, the processing unit 21 of the control unit 20 sets the setting register of the communication processing control unit 26 so that the operation mode of the communication processing control unit 26 returns from the sleep mode, that is, shifts from the sleep mode to the normal mode. Rewrite further. In step S218, when the setting register of the communication processing control unit 26 is rewritten in step S217, the operation mode of the communication processing control unit 26 shifts from the sleep mode to the normal mode.

Step S219 corresponds to step S113. Step S220 corresponds to step S115. Step S221 corresponds to step S116. Step S222 corresponds to step S117. Step S223 corresponds to step S118.

In the flowchart shown in FIG. 6, after the operation mode of the communication processing control unit 26 shifts from the stop mode to the sleep mode, the sleep mode further shifts to the normal mode. However, depending on the specifications of the control unit (microcomputer) 20, the operation mode of the communication processing control unit 26 may shift directly from the stop mode to the normal mode. In this case, in the flowchart shown in FIG. 6, for example, the process of step S217 may be executed instead of the process of step S214, or the process of step S218 may be executed instead of the process of step S216.

As described above, in the stop mode that is the second power saving mode, the operation mode of the communication processing control unit 26 shifts from the stop mode to the normal mode when the second signal is output to the communication processing control unit 26. is not. That is, in the stop mode which is the second power saving mode, the operation mode of the communication processing control unit 26 is changed from the stop mode to the normal mode by rewriting the setting register of the communication processing control unit 26 by the processing unit 21 of the control unit 20. It is to be migrated.

In the stop mode, since the stop mode is continued when the second signal is output to the communication processing control unit 26, the communication processing control unit 26 sets the first frame of the CAN message including the second signal in step S211. Does not recognize. As a result, since the communication processing control unit 26 does not recognize the frames after the first frame of the CAN message including the second signal, the entire CAN message including the second signal is transferred from the communication processing control unit 26 to the control unit 20. It is not output to the processing unit 21. That is, after the operation mode of the communication processing control unit 26 shifts to the stop mode, the CAN message received by the transmission / reception unit 30 is output until the termination frame of the CAN message including the second signal is output to the communication processing control unit 26. There is no output from the communication processing control unit 26 to the processing unit 21 of the control unit 20.

Thus, after the operation mode of the communication processing control unit 26 shifts to the stop mode, the CAN message received from the transmission / reception unit 30 by the communication processing control unit 26 is output to the processing unit 21 of the control unit 20 in FIG. It is after execution of the process of step S223 in the flowchart shown. Even if the CAN message received by the transmission / reception unit 30 is output to the communication processing control unit 26 in an inaccurate state due to the transmission / reception unit 30 being in the standby mode, the processing unit 21 of the control unit 20 may A CAN message that is not in the state is not received from the communication processing control unit 26. Therefore, even if such a state occurs, the processing unit 21 of the control unit 20 does not recognize that some abnormal state has occurred in the ECU 10.

Moreover, in ECU10 in 2nd Embodiment, since the process part 21 of the control part 20 has the interruption terminal 23, the operation mode of the communication process control part 26 is a stop mode which is a 2nd power saving mode. Sometimes, the processing unit 21 can grasp that the second signal has been received from the communication line 60. As a result, when the operation mode of the communication processing control unit 26 is the stop mode, the operation mode of the communication processing control unit 26 shifts from the stop mode to the normal mode by the second signal received by the transmission / reception unit 30 from the communication line 60. can do.

Moreover, in ECU10 in 2nd Embodiment, the process part 21 of the control part 20 is a signal output from the transmission / reception part 30 only when the operation mode of the communication process control part 26 is a stop mode which is a 2nd power saving mode. May be received from the interrupt terminal 23. That is, when the operation mode of the communication processing control unit 26 is the sleep mode that is the first power saving mode or the normal mode, the processing unit 21 may prohibit the input to the interrupt terminal 23.

Further, in both the ECU 10 in the first embodiment and the ECU 10 in the second embodiment, not only the communication processing control unit 26 of the control unit 20 of the ECU 10 but also the operation mode of the entire control unit 20 or the processing unit 21 is the normal mode. You may be comprised so that transfer between power saving modes is possible. For example, after the operation mode of the communication processing control unit 26 shifts from the normal mode to the power saving mode, the communication of the in-vehicle device 40 to be controlled with other in-vehicle devices connected to the communication line 60, sensors, etc. On the other hand, after the operation in the operation mode that requires the control of the in-vehicle device 40 itself is completed, the entire control unit 20 or the operation mode of the processing unit 21 may shift from the normal mode to the power saving mode. .

Specifically, for example, when a predetermined time has elapsed since the processing unit 21 of the control unit 20 received the first signal, the entire control unit 20 or the operation mode of the processing unit 21 is changed from the normal mode to the power saving mode. You may migrate. For example, during this predetermined time, the vehicle-mounted device 40 to be controlled does not need to communicate with other vehicle-mounted devices or sensors connected to the communication line 60, but the vehicle-mounted device 40 itself needs to be controlled. It is preferable that a sufficient time is set so that the operation in the operation mode is completed. Further, for example, when a predetermined signal is received from the in-vehicle device 40, the entire control unit 20 or the operation mode of the processing unit 21 may shift from the normal mode to the power saving mode. For example, the predetermined signal does not need to communicate with other in-vehicle devices, sensors, and the like connected to the communication line 60 of the in-vehicle device 40 to be controlled, but it is necessary to control the in-vehicle device 40 itself. When the operation in a certain operation mode is completed, the vehicle-mounted device 40 may output the processing unit 21 of the control unit 20.

After the operation mode of the communication processing control unit 26 shifts from the normal mode to the power saving mode, when a predetermined condition is satisfied, the entire control unit 20 or the operation mode of the processing unit 21 changes from the normal mode to the power saving mode. By shifting, the power consumption of the ECU 10 can be further suppressed. Further, the degree of suppression of power consumption as a whole of the ECU 10 by shifting to the power saving mode at a timing at which the entire control unit 20 or the respective operation modes in the processing unit 21 and the communication processing control unit 26 can shift to the power saving mode. Can be increased step by step.

Further, in the first embodiment, when the processing unit 21 of the control unit 20 receives a wake-up signal from the communication processing control unit 26, in the second embodiment, the interrupt terminal 23 of the processing unit 21 of the control unit 20 is connected to the interrupt terminal 23. When the second signal is input, the operation mode of the entire control unit 20 or the processing unit 21 may shift from the power saving mode to the normal mode. In addition, when the processing unit 21 of the control unit 20 receives a predetermined signal from the in-vehicle device 40 to be controlled, the entire control unit 20 or the operation mode of the processing unit 21 shifts from the power saving mode to the normal mode. May be. Further, the in-vehicle device 40 may generate a predetermined signal in response to a predetermined operation input from a user of the in-vehicle device 40, for example.

The present invention is not limited to the above-described exemplary embodiments, and those skilled in the art will be able to easily modify the above-described exemplary embodiments to the extent included in the claims. .

The present invention is suitable for an electronic control device that controls a vehicle display device mounted on a vehicle.

10 (10-1, 10-2, 10-3) ... Electronic control unit (ECU), 20 ... Control unit, 21 ... Processing unit, 23 ... Interrupting terminal of processing unit, 26 ... Communication processing control unit, 30 ... Transmission / reception unit, 60 ... Communication line, 60-H ... CAN-H line, 60-L ... CAN-L line, TX ... Communication processing Transmission terminal of control unit, RX: reception terminal of communication processing control unit, STB: standby pin of transmission / reception unit.

Claims

A communication processing control unit that controls communication according to a predetermined protocol, and a control unit that controls the operation of the communication processing control unit and the operation of at least one in-vehicle device;
Provided between the communication processing control unit and the communication line, transmits the signal input from the communication processing control unit to the communication line and outputs the signal received from the communication line to the communication processing control unit A transmission / reception unit,
An electronic control device comprising:
The communication processing control unit operates between a normal mode in which the signal received from the communication line is output to the control unit and a power saving mode in which the signal received from the communication line is not output to the control unit. Mode transition is possible,
The said control part is an electronic control apparatus which transfers the said operation mode of the said communication processing control part from the said normal mode to the said power saving mode according to the 1st signal received from the outside of the said electronic control apparatus.
The power saving mode of the communication processing control unit is a first power saving mode in which the operation mode of the communication processing control unit shifts to the normal mode when the communication processing control unit receives a second signal from the communication line. The electronic control device according to claim 1, wherein the electronic control device is in a mode.
The power saving mode of the communication processing control unit is such that when the communication processing control unit receives a second signal from the communication line, the operation mode of the communication processing control unit does not shift to the normal mode, and the control unit The electronic control device according to claim 1, wherein the operation mode of the communication processing control unit is a second power saving mode in which the operation mode is shifted to the normal mode when the operation mode is set by.
The electronic control device according to claim 3, wherein the control unit has an input terminal directly connected to the transmission / reception unit.
The control unit changes the operation mode of the control unit to the normal mode when a predetermined condition is satisfied after the operation mode of the communication processing control unit is shifted from the normal mode to the power saving mode. The electronic control device according to claim 1, wherein the electronic control device is shifted from a mode to a power saving mode.