JP2017114381A - Electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control device which suppresses consumption of a battery by suppressing an erroneous operation due to the input of an abnormal signal caused by noise or the like.SOLUTION: An electronic control device 1 is roughly configured by including a system base chip 2. The system base chip has a transceiver section 20 connected to a communication bus 95; a changeover section 22 which is connected between a control section 3 for controlling connected electronic equipment and the transceiver section 20 and switches connection between the control section 3 and the transceiver section 20 and disconnection of the connection; and a monitoring section 24 which monitors an input signal Sinput via the transceiver section 20, and controls the changeover section 22 and instructs the changeover section 22 to disconnect the connection between the transceiver section 20 and the control section 3 when the input signal Sis abnormal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic control device.

  As conventional technology, when the electronic control device is operating in the sleep mode and receives first data from an external device connected to a communication line, data that outputs predetermined transmission data to the external device An output unit, a current data storage unit that stores second data transmitted from the external device in response to the transmission data, and stores the second data transmitted from the external device before receiving the second data of this time The operation mode of the electronic control device is changed from the sleep mode to the normal mode based on the comparison result of the previous data storage unit, the comparison of the content of the current data storage unit and the content of the previous data storage unit, and the comparison result of the comparison unit. There is known a communication circuit of an electronic control device including an activation signal output unit that outputs an activation signal for transition (see, for example, Patent Document 1).

  This communication circuit can prevent unnecessary wake-up and suppress battery power consumption.

Japanese Patent Laying-Open No. 2015-155259

  However, the conventional communication circuit outputs the transmission data to all external devices connected to the communication line in order to confirm whether it is a wakeup due to the influence of noise, etc. Since the wakeup is performed after comparing the content of the data storage unit with the content of the previous data storage unit, there is a possibility that the power consumption will increase over time.

  Accordingly, an object of the present invention is to provide an electronic control device that suppresses malfunction due to an input of an abnormal signal caused by noise or the like and suppresses battery consumption.

  One embodiment of the present invention is connected between a transceiver unit connected to a vehicle communication network, a control unit that controls a connected electronic device, and the transceiver unit, and switches between connection and disconnection of the control unit and the transceiver unit. A switching unit and a monitoring unit that monitors an input signal input via the transceiver unit and instructs the switching unit to control the switching unit to shut off the connection between the transceiver unit and the control unit when the input signal is abnormal And an electronic control device including a communication monitoring circuit.

  According to the present invention, it is possible to suppress battery malfunction by suppressing malfunction caused by an abnormal signal input caused by noise or the like.

FIG. 1A illustrates an example of a block diagram of an electronic control device according to the first embodiment, and FIG. 1B illustrates an example of a block diagram of a vehicle communication system including a plurality of electronic control devices. Show. FIG. 2A is a schematic diagram illustrating an example of a normal input signal input to the electronic control device according to the first embodiment, and FIG. 2B is a schematic diagram illustrating an example of an abnormal input signal. FIG. FIG. 3 is a flowchart illustrating an example of the operation of the electronic control device according to the first embodiment. FIG. 4 is an example of a block diagram of an electronic control device according to the second embodiment.

(Summary of embodiment)
An electronic control device according to an embodiment is connected between a transceiver unit connected to a vehicle communication network, a control unit that controls a connected electronic device, and a transceiver unit. The switching unit that switches off and the input signal that is input via the transceiver unit are monitored, and if the input signal is abnormal, the switching unit is controlled to instruct the switching unit to shut off the connection between the transceiver unit and the control unit And a communication monitoring circuit having a monitoring unit.

  Since this electronic control device cuts off the connection between the transceiver unit and the control unit by inputting an abnormal signal due to noise or the like, it is possible to suppress malfunction and suppress battery consumption.

[First embodiment]
(Outline of electronic control unit 1)
FIG. 1A illustrates an example of a block diagram of an electronic control device according to the first embodiment, and FIG. 1B illustrates an example of a block diagram of a vehicle communication system including a plurality of electronic control devices. Show. FIG. 2A is a schematic diagram illustrating an example of a normal input signal input to the electronic control device according to the first embodiment, and FIG. 2B is a schematic diagram illustrating an example of an abnormal input signal. FIG. 2A and 2B, the vertical axis represents voltage V, and the horizontal axis represents time t. In FIG. 1A and FIG. 4 described later, main signals and the like are illustrated.

  The electronic control apparatus 1 controls the electronic device mounted in the vehicle as an example. The electronic control device 1 is mounted for each electronic device. As an example, this electronic device includes an engine device, a motor device, a suspension, a steering, a transmission, a switch device, an interior lighting device, a seat belt device, a seat device, an air conditioner, an air bag device, a mirror device, a driving support system, and a navigation device. Door lock devices, brake devices, anti-lock brake systems (ABS), headlights, and the like.

  As shown in FIGS. 1A and 1B, these electronic control devices 1 are connected to a communication bus 95 which is a vehicle communication network. The electronic control device 1 corresponds to CAN (Controller Area Network), LIN (Local Interconnect Network), and the like, which are protocols for vehicle communication. This CAN is used in a power train system such as an engine device or ABS. The LIN is used in a body system such as a door lock device or a seat device. In the present embodiment, an electronic control device 1 using LIN will be described as an example. The electronic control device 1 may be a master or a slave.

The electronic control device 1 is connected between the transceiver unit 20 connected to the communication bus 95, the control unit 3 that controls the connected electronic device, and the transceiver unit 20, and the connection between the control unit 3 and the transceiver unit 20 a switching unit 22 for switching the cutoff of the connection, to monitor the input signals S ₁ input via the transceiver unit 20, the input signal when S ₁ is abnormal, the transceiver unit 20 and the control unit 3 controls the switch section 22 The system base chip 2 as a communication monitoring circuit having a monitoring unit 24 for instructing the switching unit 22 to cut off the connection is provided.

When the input signal S ₁ is abnormal, the monitoring unit 24 outputs an abnormality notification signal S ₃ as a signal for notifying the control unit 3 of the abnormality.

(Configuration of system base chip 2)
As shown in FIG. 1A, the system base chip 2 further includes a power supply unit 26 and a power supply control unit 28. That is, in the system base chip 2, for example, the transceiver unit 20, the switching unit 22, the monitoring unit 24, the power supply unit 26, and the power supply control unit 28 are configured as one chip.

The transceiver unit 20 converts, for example, a signal input from the vehicle ECU 90 or the like input via the communication bus 95 into an input signal S ₁ that can be handled by the control unit 3 and outputs the input signal S ₁ to the control unit 3 via the switching unit 22. It is configured as follows.

  Further, the transceiver unit 20 is configured to convert the signal output from the control unit 3 input via the switching unit 22 into a format to be output to the communication bus 95 and output the signal. The transceiver unit 20 corresponds to CAN and LIN.

An example of the input signal S _1, and Wake-up signal, the control unit 3 by the wake-up signal Sleep via the communication bus 95 from the vehicle ECU90 by the power of the vehicle is turned to enter into the transceiver unit 20 From the state, etc., it becomes the start state

Switching unit 22 based on the switching signal S ₂ output from the monitoring unit 24, switches the connection between the transceiver unit 20 and the control unit 3. As an example, the switching unit 22 is connected to the control unit 3 via the CAN / LIN communication bus 5 as shown in FIG.

The monitoring unit 24 monitors the input signal S ₁ output from the transceiver unit 20. As an example, as shown in FIG. 2A, the input signal S ₁ is a signal that repeats dominant (0) and recessive (1) that can be synchronized in accordance with a bit stuffing rule, as shown in FIG. Become. The dominant is 0 v as an example. Recessive is 5v as an example.

On the other hand, when the input signals S ₁ is an abnormal signal, as an example, as shown in FIG. 2 (b), the influence such as noise, dominant and abnormal signal disturbed rather than signals configured by recessive It becomes. When this abnormal signal is input, there is a possibility that the control unit 3 erroneously determines that it is a wake-up signal and enters an activated state, and power is wasted.

However monitoring unit 24, the monitor input signal S ₁ is input signals S ₁ determines that an abnormal signal, and outputs a switching signal S ₂ to interrupt the connection between the transceiver unit 20 and the control unit 3 The abnormal signal is prevented from being input to the control unit 3.

Monitoring unit 24 is, for example, is in the ignition switch is turned off in the vehicle, and if the determination condition changing over the input signal time S ₁ is predetermined persists holds, the input signals S ₁ is in an abnormal signal Is determined. As a modification, the monitoring unit 24 determines that an abnormality has occurred when a communication abnormality continues in addition to the above determination condition. The communication abnormality is, for example, indicates that the input signals S ₁ not a signal conforming to standards such as bit stuffing rule.

Monitoring unit 24 is, for example, determines that the ignition switch is Enter the input signals S ₁ at the time of the OFF state until the input signals S ₁ inputs indicating the ON state, the ignition switch is in the OFF state.

The monitoring unit 24, as an example, a longer time than the duration of a normal input signals S ₁ for waking up, and time determined above in advance.

For example, when the above-described determination condition is satisfied, the monitoring unit 24 generates an abnormality notification signal S ₃ indicating an input of an abnormal signal and outputs the abnormality notification signal S ₃ to the control unit 3 via an SPI (Serial Peripheral Interface) communication bus 4.

Incidentally return from the power saving mode is performed, for example, when the input signal S ₁ is that more than a predetermined period recessive state, such that the ignition switch is turned on has occurred. This predetermined period is a period set in advance.

The power supply unit 26 is configured to supply to generate a drive voltage V ₂ for driving the control unit 3 based on the battery voltages V ₁ supplied from a battery 6 of the vehicle. The power supply unit 26 obtains the control signal S ₅ outputted from the power supply control unit 28, interrupting the supply of the driving voltage V _2, or to reduce power consumption, to supply a necessary minimum driving voltage It is configured. The power supply unit 26 also supplies a driving voltage suitable for driving these to the transceiver unit 20 and the like.

The power control unit 28 is connected to the control unit 3 through the SPI communication bus 4. Power supply control unit 28, for example, via an SPI communications bus 4 from the control unit 3, the supply obtains the power control signal S _4, which cuts off the power supplied to the control unit 3, or the necessary minimum driving voltage and it is configured to output a control signal S ₅ to the power supply unit 26.

(Configuration of control unit 3)
The control unit 3 includes, for example, a CPU (Central Processing Unit) that performs operations and processes on acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. Microcomputer. In this ROM, for example, a program for operating the control unit 3 is stored. For example, the RAM is used as a storage area for temporarily storing calculation results and the like. Further, the control unit 3 has means for generating a clock signal therein, and performs an operation based on the clock signal and measures time.

For example, the control unit 3 has at least a normal mode and a power saving mode. Normal mode, for example, is a mode for controlling the electronic device receives a supply of the drive voltage V ₂ from the power supply unit 26. The power saving mode is a mode for suppressing power consumption, for example.

Control unit 3, the normal mode for starting the control of the electronic device is activated to control object and the input signals S ₁ indicating a wake-up inputs. The control unit 3, after started, the case of continuing dominant state of the input signal S ₁ is a set time or more, to suppress the power consumption of the shifts from the normal mode to the power saving mode. The control unit 3 generates a power control signal S ₄ corresponding to the normal mode and the power saving mode and outputs the power control signal S ₄ to the power control unit 28.

The control unit 3, if the monitoring unit 24 the input signals S ₁ of the abnormality notification signal S ₃ for notifying the abnormality inputted, outputs a signal (abnormality notification signal S ₆₎ for notifying the abnormality to the outside. This abnormality notification signal _{S 6} is, for example, is outputted to the vehicle ECU90 via a switching unit 22, transceiver unit 20 and the communication bus 95. When the abnormality notification signal S ₃ is input, the control unit 3 generates a power control signal S ₄ for shifting to the power saving mode and outputs the power control signal S ₄ to the power control unit 28 via the SPI communication bus 4.

(Configuration of vehicle communication system 9)
Vehicle communication system 9, for example, as shown in FIG. 1 (b), the vehicle ECU 90, the electronic control unit 1 connected to the respective electronic device 8a ₁ ~ electronic equipment 8a _n, the electronic device 8a ₁ ~ electronic device and 8a _n, is schematically configured to include a communication bus 95, the. Note that n is an integer of 1 or more corresponding to the number of electronic devices controlled by the electronic control device 1.

  The vehicle ECU 90 is a microcomputer including a CPU, a RAM, a ROM, and the like that comprehensively control the vehicle. For example, when the vehicle is powered on, the vehicle ECU 90 outputs a wake-up signal for starting the electronic control device 1 to the transceiver unit 20 of each electronic control device 1 via the communication bus 95.

  Below, operation | movement of the electronic control apparatus 1 which concerns on this Embodiment is demonstrated according to the flowchart of FIG. Here, a case where the electronic control device 1 is in the power saving mode will be described.

(Operation)
Monitoring unit 24 of the electronic control unit 1 monitors the input signal _{S 1} (Step1). If “Yes” in Step 2 is satisfied, that is, if the determination condition is satisfied (Step 2: Yes), the monitoring unit 24 determines that the input signal S ₁ is an abnormal signal (Step 3). The determination condition is, as described above, is a condition in which the ignition switch of the vehicle is in the off state, and change over time where the input signals S ₁ predetermined persists.

When the monitoring unit 24 determines that the input signal S ₁ is abnormal, the monitoring unit 24 outputs the switching signal S ₂ to the switching unit 22 to cut off the connection between the transceiver unit 20 and the control unit ₃ and generate the abnormality notification signal S ₃ . And output to the control unit 3 (Step 4).

Control unit 3 obtains the abnormality notification signal S _3, abnormal migration with generates and outputs an abnormality notification signal S ₆ for informing the vehicle ECU 90, and outputs a power control signal S ₄ to the power saving mode To do.

(Effects of the first embodiment)
Since the electronic control device 1 according to the present embodiment cuts off the connection between the transceiver unit 20 and the control unit 3 by the input of an abnormal signal due to noise or the like, unnecessary wakeup due to the input of an abnormal signal is prevented. It is possible to suppress battery consumption. In addition, the electronic control device 1 can suppress unnecessary wake-up due to the influence of noise or the like caused by an attack by a malicious third party, and can suppress unnecessary consumption of the battery. be able to.

The electronic control unit 1, when the input signals S ₁ was abnormal signal, it is possible to output an abnormality notification signal S ₆ for informing abnormality to the vehicle ECU 90, that the abnormal signal is input, the vehicle ECU 90 Can be notified to a service center, a user terminal device, or the like. As an example, this service center is connected to the vehicle ECU 90 via a communication network such as the Internet, and performs transmission / reception of e-mails, reception of communication when an accident occurs, and the like. The user terminal device is, for example, a mobile phone or a multi-function phone owned by a vehicle user.

  The electronic control unit 1 cuts off the connection between the transceiver unit 20 and the control unit 3 even when strong environmental noise is applied to the vehicle, thereby suppressing unnecessary wake-up and unnecessary consumption of the battery. Can do.

[Second Embodiment]
The second embodiment is different from the other embodiments in that the mode of the transceiver unit 20 is further changed when an abnormal signal is input.

  FIG. 4 is an example of a block diagram of an electronic control device according to the second embodiment. In the embodiments described below, parts having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

As shown in FIG. 4, the monitoring unit 24 according to the present embodiment suppresses power consumption of the transceiver unit 20 or cuts off the supplied power of the transceiver unit 20 when the input signal S ₁ is abnormal. The signal (mode control signal S ₇ ) is output to the transceiver unit 20.

The transceiver unit 20, entering the mode control signal S _7, suppressing the power consumption from the normal mode, or shifts to the power saving mode such as to cut off the power of the transceiver unit 20 is supplied.

When the monitoring unit 24 determines that the input signal S ₁ is an abnormal signal based on the determination condition, the monitoring unit 24 generates a switching signal S ₂ and an abnormality notification signal S ₃ and outputs them to the switching unit 22 and the control unit 3. A mode control signal S ₇ is generated and output to the transceiver unit 20.

Monitoring unit 24 of the electronic control unit 1, when the input signals S ₁ determines that an abnormal signal, so outputs a mode control signal S ₇ for switching the transceiver unit 20 from the normal mode to the power saving mode, the configuration The power consumption can be further suppressed as compared with the case where it does not have.

The monitoring unit 24 as another embodiment, when there is an abnormality in the input signal S _1, stopping the communication predetermined condition with respect to the transceiver unit 20 via the communication bus 95 until satisfied. The predetermined condition is, for example, a case where the recessive state continues for a certain time or a case where the ignition switch is turned on.

  As mentioned above, although some embodiment of this invention was described, these embodiment is only an example and does not limit the invention which concerns on a claim. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all the combinations of features described in these embodiments are essential to the means for solving the problems of the invention. Furthermore, these embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1 ... electronic control unit, 2 ... system base chip, 3 ... control unit, 4 ... SPI communications bus, 5 ... CAN / LIN communication bus, 6 ... battery, _8a 1 ~8a n _... electronic device, 9 ... vehicle communication system, DESCRIPTION OF SYMBOLS 20 ... Transceiver part, 22 ... Switching part, 24 ... Monitoring part, 26 ... Power supply part, 28 ... Power supply control part, 90 ... Vehicle ECU, 95 ... Communication bus

Claims (5)

A transceiver unit connected to the vehicle communication network;
A switching unit that is connected between a control unit that controls a connected electronic device and the transceiver unit, and that switches between connection and disconnection of the control unit and the transceiver unit;
The input signal input through the transceiver unit is monitored, and if the input signal is abnormal, the switching unit is controlled to instruct the switching unit to disconnect the connection between the transceiver unit and the control unit. A monitoring unit;
An electronic control device comprising a communication monitoring circuit. When the input signal is abnormal, the monitoring unit outputs a signal notifying the control unit of the abnormality.
The electronic control device according to claim 1. The monitoring unit outputs a signal to the transceiver unit that suppresses power consumption of the transceiver unit or shuts off the supplied power of the transceiver unit when there is an abnormality in the input signal.
The electronic control device according to claim 1 or 2. The monitoring unit, when there is an abnormality in the input signal, stops communication via the vehicle communication network until a predetermined condition is established for the transceiver unit,
The electronic control device according to claim 1 or 2. The communication monitoring circuit according to any one of claims 1 to 4,
The control unit electrically connected to the communication monitoring circuit;
With
When there is an abnormality in the input signal, the monitoring unit outputs a signal notifying the control unit of the abnormality,
The control unit, when a signal notifying the abnormality of the input signal is input, outputs a signal to notify the abnormality to the outside,
Electronic control device.

Images