WO2012018033A1 - 処理システム、処理装置及び電源制御方法 - Google Patents
処理システム、処理装置及び電源制御方法 Download PDFInfo
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- WO2012018033A1 WO2012018033A1 PCT/JP2011/067726 JP2011067726W WO2012018033A1 WO 2012018033 A1 WO2012018033 A1 WO 2012018033A1 JP 2011067726 W JP2011067726 W JP 2011067726W WO 2012018033 A1 WO2012018033 A1 WO 2012018033A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3209—Monitoring remote activity, e.g. over telephone lines or network connections
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40039—Details regarding the setting of the power status of a node according to activity on the bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to power control of a system in which a plurality of processing devices communicate with each other, and in particular, enables power control of processing devices connected to the same communication medium individually, and power consumption as a whole system.
- the present invention relates to a processing system, a processing apparatus, and a power supply control method that can reduce power consumption.
- a system that realizes various signal processing by connecting a plurality of processing devices through a communication medium and exchanging information with each other is used in many fields.
- ECUs Electronic Control Units
- ECUs connected to the same communication line are basically started all at once.
- all ECUs connected to the same communication line are in a state where they can shift to the power saving state, and only when communication on the communication line is stopped, shift to each power saving state. It is like that.
- all connected ECUs detect the input of the communication signal and start up.
- some ECUs connected to the same communication line may include ECUs that do not need to be activated.
- the ECUs start other ECUs or send / receive information for shifting to the power saving state separately, and each ECU is individually started based on the information or shifted to the power saving state.
- a technology to enable this is conceivable. For example, start up by controlling the transition to the power saving state by connecting the ECUs with a dedicated signal line so that signals different from existing communication protocols (for example, CAN (Controller Area Network)) can be transmitted and received. Is also possible.
- CAN Controller Area Network
- the system is wasted such that a dedicated signal line is required.
- Patent Document 1 differs from a CAN communication signal by superimposing a second signal in the same phase on a twisted pair cable between ECUs communicating based on a CAN protocol using a differential signal.
- Systems and methods are disclosed that can transmit information for transmitting data.
- Patent Document 2 discloses a system that superimposes another modulation signal on communication based on the CAN protocol and increases the amount of information that can be transmitted and received without adding a communication line.
- Patent Document 1 discloses only a configuration in which a high-frequency signal is superimposed because it is intended for communication of information having a larger data amount than CAN communication, for example, a video signal. Therefore, no consideration is given to a configuration in which information for power supply control is transmitted and received between ECUs.
- the modulated signal is transmitted in combination with the timing in the data field in the CAN message, and it is difficult to transmit and receive the modulated signal independently of the CAN signal.
- the present invention has been made in view of such circumstances, and individually controls the power supply of processing devices connected to the same communication medium while maintaining the existing communication form without connecting with a special dedicated line. It is an object of the present invention to provide a processing system, a processing apparatus, and a power supply control method that can be performed in the same manner.
- a processing system is connected to a processing unit that performs signal processing on an input signal and outputs the signal and a communication line including two signal lines, and the communication line is connected to the first communication system.
- a communication unit that receives a signal transmitted as a differential signal based on the first communication method and outputs the signal output from the processing unit to the communication line based on a first communication method; and the processing unit
- a processing system in which a plurality of processing devices including a power supply control unit that controls on / off of power supply from the outside to a computer are connected via a communication line, one processing device among the plurality of processing devices Then, the processing unit outputs a control signal for controlling on / off to another processing device, and the control signal output from the processing unit to the other processing device is transmitted to the second communication device.
- the other processing device includes a receiving unit that receives each of the first signal based on the first communication method and the second signal based on the second communication method from the communication line.
- the received first signal is input to the communication unit and the second signal is input to the power supply control unit, and the power supply control unit controls on / off of power supply based on the input signal. It is characterized by the above.
- the other processing device includes a first signal that is received by the receiving unit, input by the communication unit, and output from the communication unit to the processing unit, and the receiving unit And an input / output unit that outputs each signal to the power supply control unit and the processing unit based on the input signal, and the input / output unit receives the input second signal.
- the power supply control unit turns on the power supply, and the communication unit and the communication unit It is characterized in that the interruption of communication with the processing unit is released.
- control signal includes destination information for specifying a processing device whose power on / off is to be controlled, and the input / output unit determines whether the input second signal is addressed to itself.
- a means for judging whether or not is further provided, and the second signal inputted when the means judges negative is ignored.
- control signal includes information indicating power on / off for each of a plurality of other processing apparatuses.
- the processing system according to the sixth invention is characterized in that the communication speed of the second communication method is lower than that of the communication method of the first communication method.
- the processing system according to the seventh invention is characterized in that the first communication method is a differential signal and the second communication method is serial communication.
- a processing device is connected to a processing unit that performs signal processing on an input signal and outputs the signal, and a communication line composed of two signal lines, and the communication line is connected to the first communication system.
- a processing unit that receives a signal transmitted as a differential signal based on the first communication method and outputs the signal to the processing unit, and transmits the signal output from the processing unit to the communication line based on a first communication method.
- the processing unit outputs a control signal for controlling on / off to another processing device, and the control signal output to the other processing device by the processing unit is set to a second communication method.
- a transmission unit that transmits the signal to the signal line of the communication line in phase.
- a processing device is connected to a processing unit that performs signal processing on an input signal and outputs the signal, and a communication line including two signal lines, and the communication line is connected to the first communication system.
- a communication unit that receives a signal transmitted as a differential signal based on the first communication method and outputs the signal output from the processing unit to the communication line based on a first communication method; and the processing unit And a power supply control unit for controlling on / off of power supply from the outside to the first signal based on the first communication method and the second signal based on the second communication method from the communication line
- Each receiving unit includes a receiving unit, wherein the first signal received by the receiving unit is input to the communication unit, the second signal is input to the power control unit, and the power control unit is input Control power on / off based on signal And wherein the are.
- a power supply control method is connected to a processing unit that performs signal processing on an input signal and outputs the signal, and a communication line including two signal lines, and a first communication system is connected to the communication line.
- a communication unit that receives a signal transmitted as a differential signal based on the signal, outputs the signal to the processing unit, and transmits the signal output from the processing unit to the communication line based on a first communication method; and the processing Control power consumption of the plurality of processing devices in a processing system in which a plurality of processing devices including a power supply control unit that controls on / off of external power supply to the units are connected via a communication line
- the processing unit outputs a control signal for controlling on / off to another processing device, and the processing unit outputs the control signal.
- the control signal to the other processing device is transmitted to the second communication method.
- the other processing devices Based on the signal line of the communication line, and the other processing devices receive the first signal based on the first communication method and the second signal based on the second communication method from the communication line, respectively,
- the first signal is received by the communication unit, the received second signal is input to the power control unit, and the power control unit controls on / off of power supply based on the input control signal.
- a control signal for controlling on / off of another processing device by one processing device among a plurality of processing devices is a signal on a communication line through which a differential signal based on the first communication method is transmitted and received. It is transmitted to the line in phase with the second communication method.
- a signal based on the first communication method and a signal based on the second communication method are superimposed on the communication line connecting the plurality of processing devices. Since one is a differential signal and the other is an in-phase signal, it is possible to prevent mutual interference.
- Each of the other processing devices that are power on / off control targets receives a signal based on the first communication method and a signal based on the second communication method, and is based on the first communication method.
- the signal is received by a conventional communication unit, the signal based on the second communication method is input to the power supply control unit, and the power supply control unit supplies power to the processing unit based on the control signal output from one processing device. Control supply on / off. In a processing apparatus in which power supply to the processing unit is turned off, a signal input from the communication unit is ignored. Thereby, it is possible to individually turn off the plurality of processing devices connected to the same communication line.
- a signal after input to the communication unit of the first signal based on the first communication method received from the same communication line The second signal based on the two communication methods is input, and an input / output unit that comprehensively determines the two is provided.
- the input / output unit turns off the power supply to the processing unit and interrupts communication between the communication unit and the processing unit.
- the power supply OFF control signal is received to turn off the power supply to the processing unit, and the processing device that has interrupted communication between the communication unit and the processing unit outputs the power ON control signal.
- the power supply to the processing unit is turned on, the interruption is released, and input / output between the communication unit and the processing unit is enabled.
- other processing apparatuses can be individually returned from the power-off state to the power-on state.
- the power-on / off control signal transmitted from one processing device to another processing device includes destination information that can specify which of the other processing devices is to be controlled. included.
- each processing apparatus can determine whether or not the control signal transmitted to the communication line by the second communication method is addressed to itself, and can individually control the power on / off of the processing apparatus. It becomes possible.
- the destination information is identification information such as an identification number of each processing apparatus.
- control signal information on power on / off addressed to a plurality of processing devices is included in a control signal transmitted at a time.
- the power on / off of the plurality of processing devices can be controlled by transmitting the control signal once, and the efficiency is improved.
- the control signal is distinguished in advance into a plurality of units, and it is only necessary that each unit includes ON / OFF information in a predetermined order of the processing device.
- the control signal is digital, for example, the power on / off of each processing device can be controlled by one byte by controlling the power on / off of each processing device by one bit at a time in ascending order of the identification number.
- the communication speed of the second communication method is set lower than that of the first communication method. As a result, it is possible to avoid an obstacle by distinguishing signals from each other. Since the information amount of the power on / off is smaller than the information to be signal processed by the processing unit, there is no problem even if the communication speed is low.
- the first communication method uses a differential signal such as CAN
- the second communication method uses serial communication.
- a differential signal such as CAN
- serial communication This makes it possible to use a CAN communication unit, a serial communication unit, and the like that are installed in an existing processing apparatus, and an existing system can be used.
- the present invention since it is possible to individually turn off a plurality of processing devices connected to the same communication medium (communication line), the power consumption of the entire system including a plurality of processing devices is further reduced. can do. At this time, there is no need to connect the processing apparatuses with a dedicated line for power control, and the communication unit can also use an existing device.
- FIG. 1 is a configuration diagram showing a configuration of an in-vehicle communication system according to the present embodiment.
- the in-vehicle communication system includes a plurality of ECUs 1, ECU 2 a, ECU 2 b, ECU 2 c and ECU 2 d, and a CAN bus 3.
- the ECU 1, ECU 2a, ECU 2b, ECU 2c, and ECU 2d in the present embodiment are each a processor based on a computer program, that is, a microcomputer (hereinafter referred to as a microcomputer) for each device mounted on the vehicle to realize various functions of the vehicle. It is the control apparatus which performs control by.
- a microcomputer hereinafter referred to as a microcomputer
- the ECU 1, ECU 2a, ECU 2b, ECU 2c and ECU 2d are configured to perform different functions, they are connected to the same CAN bus 3 and transmit / receive data to / from each other based on the CAN protocol. Do.
- the CAN bus 3 is a twisted pair cable used for communication using the CAN protocol. A shielded twisted pair cable is desirable.
- the ECU 1, ECU 2 a, ECU 2 b, ECU 2 c, and ECU 2 d basically perform CAN communication with a differential signal via the CAN bus 3.
- the ECU1 is equipped with the function of the power management which controls the power on / off of the apparatus mounted in the vehicle, for example, and controls the power consumption of the whole system mounted in the vehicle.
- the ECU 1 may have a function of connecting to a battery sensor (not shown) to monitor the remaining battery level and performing power management based on the remaining battery level.
- the ECU 1 functions as a master for the ECU 2a, ECU 2b, ECU 2c, and ECU 2d, and has a function of individually controlling power on / off of the slave ECUs 2a, 2b, 2c, and 2d. Note that an ID number is assigned to each of the ECU 1, the ECU 2a, the ECU 2b, the ECU 2c, and the ECU 2d, and each ID number is stored.
- the ECU 2a and ECU 2b operate when the vehicle is stopped, particularly when the ignition is off, and the ECU 2c and ECU 2d operate regardless of whether the vehicle is running.
- the ECU 2a is a device that performs locking / unlocking of the door lock, and the power may be turned off during traveling.
- the ECU 2b is a device that performs security processing such as forcibly unlocking the door lock, impacting the vehicle body, jacking up, etc. while the vehicle is stopped, and issuing a warning, and the power may be turned off while traveling. .
- the ECU 2a, ECU 2b, ECU 2c and ECU 2d are connected to the same CAN bus 3, but have different functions and different operating conditions. Therefore, in the present embodiment, as described below, the ECU 1 individually controls the power on / off of the ECU 2a, the ECU 2b, the ECU 2c, and the ECU 2d according to the situation.
- ECU 2a, ECU 2b, ECU 2c, and ECU 2d each determine whether or not they may shift to power-off (or a power-saving state), and then shift to power-off.
- the ECU 1 is configured to control the power-on when the power is turned off and the power is turned on individually.
- the ECU 1 may be configured to control the power-off of each ECU 2a, ECU 2b, ECU 2c, and ECU 2d.
- FIG. 2 is a block diagram showing the internal configuration of the ECUs 1, 2a, 2b, 2c, 2d in the present embodiment.
- solid lines indicate signal input / output
- broken lines indicate power supply
- thick lines indicate communication lines. Since the internal configuration of the ECU 2a is the same as the internal configurations of the other ECUs 2b, 2c, and 2d, the internal configuration of the ECU 2a will be described in detail below, and the detailed description of the ECU 2b, the ECU 2c, and the ECU 2d will be omitted.
- the ECU 1 includes a microcomputer 10, a power supply circuit 11, a CAN transceiver 12, and a signal superimposing circuit 13.
- the microcomputer 10 operates by receiving power from a battery (+ B) (not shown) from the power supply circuit 11 at the Vcc terminal.
- the microcomputer 10 is connected to the CAN transceiver 12 through transmission / reception terminals Tx and Rx.
- the microcomputer 10 is connected to the signal superimposing circuit 13 by serial communication.
- the CAN transceiver 12 is connected to the signal superimposing circuit 13 and connected to the communication line 3 via the signal superimposing circuit 13.
- the microcomputer 10 has a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) (both not shown), and the CPU reads and executes a computer program stored in advance in the ROM. By doing so, the function as ECU1 is implement
- the microcomputer 10 has a CAN communication controller function, and performs CAN communication by a CAN transceiver 12 connected by transmission / reception terminals Tx and Rx.
- the microcomputer 10 determines whether or not the ECU 2a, ECU 2b, ECU 2c, and ECU 2d need to be turned on / off based on information obtained by CAN communication based on a computer program stored in the ROM. Then, the microcomputer 10 outputs a power control signal indicating power on or off by serial communication to any of the ECUs 2a, 2b, 2c, and 2d that are determined to require a change in the power on / off state.
- a power control signal indicating power on or off by serial
- the power supply circuit 11 is connected to the battery (+ B), and appropriately adjusts the voltage value and the current value to each component of the ECU 1 to supply power from the battery.
- the CAN transceiver 12 realizes transmission / reception of differential signals based on CAN in the physical layer.
- the signal given from the transmission terminal Tx of the microcomputer 10 is converted into a CAN signal and output.
- the CAN transceiver 12 receives a signal sent to the CAN bus 3 via the signal superimposing circuit 13 based on the CAN protocol, and inputs the signal to the receiving terminal Rx of the microcomputer 10.
- the signal superimposing circuit 13 sends the transmission signal output from the CAN transceiver 12 to the pair cable of the CAN bus 3 and outputs the power control signal output from the microcomputer 10 to each pair cable of the CAN bus 3 by serial communication. Send in.
- the signal superimposing circuit 13 can simultaneously superimpose the CAN communication signal and the power supply control signal and transmit them to the CAN bus 3.
- the signal superimposing circuit 13 can also input the differential signal output to the CAN bus 3 to the CAN transceiver 12.
- the signal superimposing circuit 13 is coupled to the pair cable of the CAN bus 3 in parallel with the circuit that transmits the CAN_High signal and the CAN_Low signal, respectively, by connecting inductance to each pair cable of the CAN bus 3.
- FIG. 3 is a schematic diagram schematically showing the principle of the signal superimposing circuit 13.
- the signal superimposing circuit 13 connects the inductances of the coupling inductances to the terminals connected to the pair cables, and connects the resistors for matching signals to the coupling terminals of the coupling inductances.
- a circuit that inputs and outputs in-phase signals on the resistance side and a circuit that inputs CAN_High and CAN_Low signals to the terminals connected to the pair cables via inductances are connected in parallel. To be realized.
- the signal superimposing circuit 13 sends the CAN transmission signal output from the CAN transceiver 12 to the CAN bus 3, and the power control signal, which is a serial communication signal provided from the microcomputer 10, is supplied to the CAN bus 3 as an in-phase signal. It can be sent out.
- FIG. 4 is a waveform diagram showing a superimposed signal realized by the signal superimposing circuit 13. From the top of FIG. 4, a CAN_High signal (represented as CAN_H in the figure) and a CAN_Low signal (represented as CAN_L in the figure) output from the CAN transceiver 12, a power supply control that is a serial signal directly output from the microcomputer 10. A signal and a superimposed signal sent to each pair cable of the CAN bus 3 as a result of the superposition are shown.
- the CAN signal and the serial signal have a lower communication speed than the serial signal, and the information for a plurality of bits of the CAN signal corresponds to one bit of the power control signal.
- the power control signal described below includes eight data bits (D0 to D7) between the start bit (ST) of the serial communication, the parity bit (P), and the stop bit (SP).
- the IDs of the ECUs 2a, ECU 2b, ECU 2c, and ECU 2d to be controlled are specified by the 8 bits, and the power control signal is interpreted as a signal for instructing to turn on the power (the power off is determined by each person).
- the 8-bit ID of the slave ECU 2a, ECU 2b, ECU 2c, or ECU 2d is expressed as “00010000b” (No. 16).
- the power control signal may have any meaning of power on / off
- the first 7 bits (D0 to D6) in the data bits express the ID of the slave ECU 2a, ECU 2b, ECU 2c or ECU 2d
- the 8th bit (D7) may be determined so as to represent power on “1” / power off “0”.
- the power on / off of all the ECUs 2a, 2b, 2c and 2d may be expressed by 8 bits.
- the first bit (D0) is ECU 2a
- the second bit (D1) is ECU 2b
- the third bit (D2) is ECU 2c
- the fourth bit (D3) is ECU 2d
- each bit is “1”. If so, the power may be turned on, and if it is “0”, the power may be turned off. In this case, based on one situation, it is possible to control the power on / off of each of the plurality of ECUs 2a, 2b, 2c and 2d by transmitting the power control signal once.
- the ECU 1 configured as described above determines which of the ECU 2a, the ECU 2b, the ECU 2c, and the ECU 2d is to be powered on from the power-off state by processing of the CPU of the microcomputer 10, and sends the power control signal to the signal superimposing circuit 13.
- the ECU 2a and the ECU 2b determine that the power may be turned off, and the power of each vehicle is turned off. After that, even when the vehicle is running, if the ECU 1 detects a door unlock request based on an input from a switch such as a driver's seat, the ECU 1 turns on the power to turn on the ECU 2a.
- the power supply control signal includes a node ID for distinguishing each of the slave ECUs 2a, 2b, 2c and 2d so that each ECU 2a, 2b, 2c and 2d can determine whether the power supply control signal is addressed to itself.
- the ECU 2a includes a microcomputer 20a, a power supply circuit 21a, a CAN transceiver 22a, a signal separation circuit 23a, and an input / output control circuit 24a.
- the microcomputer 20a is connected to the power supply circuit 21a at the Vcc terminal, and is connected to the input / output control circuit 24a at the transmission / reception terminals Tx, Rx and the input / output terminals.
- the power supply circuit 21a is connected not only to the microcomputer 20a but also to the CAN transceiver 22a, the signal separation circuit 23a, and the input / output control circuit 24a via a power line (not shown).
- the input / output control circuit 24a is connected to the CAN transceiver 22a so that a transmission signal and a reception signal can be input / output.
- the input / output control circuit 24a is also connected to the signal separation circuit 23a by serial communication, and the power supply circuit 21a can also input / output a power on / off signal. Connected as possible.
- the signal separation circuit 23a is connected not only directly to the input / output control circuit 24a by serial communication but also to the CAN transceiver 22a.
- the microcomputer 20a incorporates a CPU, a ROM, and a RAM.
- the CPU reads and executes a computer program stored in advance in the ROM, thereby realizing door lock / unlock processing.
- the microcomputer 20a includes a Vcc terminal that receives power supply, a transmission / reception terminal for communication, and an input / output terminal.
- the microcomputer 20a receives a CAN reception signal input via the input / output control circuit 24a at the reception terminal Rx, obtains information by CAN communication, and outputs information to be transmitted by CAN communication at the transmission terminal Tx. Normally, the microcomputer 20a is activated even if it is in a power saving state (sleep state) when detecting an input of a reception signal at the reception terminal Rx.
- the microcomputer 20a determines that the microcomputer 20a shifts to the power-off state
- the microcomputer 20a outputs a power-off request signal from the output terminal to the input / output control circuit 24a.
- the microcomputer 20a detects that the ignition switch is turned on and the traveling speed is 20 km / h or more from the ignition switch information and the traveling speed information obtained by CAN communication
- the microcomputer 20a determines that the power is turned off.
- the power supply circuit 21a is connected to the battery (+ B), and supplies power from the battery by appropriately adjusting the voltage value and the current value to each component of the ECU 2a.
- the power supply circuit 21a has a function of switching on / off the supply of power to the microcomputer 20a based on a power on / off signal input from the input / output control circuit 24a.
- the power supply circuit 21a stops supplying power to the microcomputer 20a based on the power-off signal input from the input / output control circuit 24a, and starts supplying power when the power-on signal is input.
- the CAN transceiver 22a realizes transmission / reception of differential signals based on CAN in the physical layer.
- a signal supplied from the transmission terminal Tx of the microcomputer 20a and input via the input / output control circuit 24a is converted into a CAN signal and output.
- the CAN transceiver 22a receives the signal transmitted to the CAN bus 3 based on the CAN protocol via the signal separation circuit 23a, and inputs the signal to the reception terminal Rx of the microcomputer 20a via the input / output control circuit 24a.
- the signal separation circuit 23a inputs the differential signal output to the CAN bus 3 to the CAN transceiver 22a and inputs the in-phase signal output to the CAN bus 3 to the input / output control circuit 24a.
- the signal separation circuit 23a can receive both the differential signal and the in-phase signal generated simultaneously on the CAN bus 3, and can separate them separately. That is, the signal separation circuit 23a separates the superimposed signal shown in FIG. 4 into the CAN communication signal and the power supply control signal shown in the upper part of FIG. 4 and inputs them to the CAN transceiver 22a and the input / output control circuit 24a, respectively. Can do.
- the signal separation circuit 23a also has a function of outputting a transmission signal transmitted from the transmission terminal Tx of the microcomputer 20a and passing through the input / output control circuit 24a as a differential signal based on the CAN protocol.
- the detailed configuration of the signal separation circuit 23a is configured by connecting a coupling inductance in parallel to a connection portion between the CAN transceiver 22a and the CAN bus 3 in the same manner as the signal superimposing circuit 13 shown in FIG.
- the CAN transceiver 22a receives the CAN_High signal and the CAN_Low signal, respectively, and the input / output control circuit 24a can receive the serial communication signal generated in the same phase as the superimposed CAN_High and CAN_Low.
- the signal separation circuit 23a can also be realized by installing a single differential amplifier.
- the input / output control circuit 24a interprets the serial communication signal received by the signal separation circuit 23a as a power supply control signal, and when the power supply control signal is addressed to the ECU 2a, the power supply circuit 21a is turned on based on the power supply control signal. / Input an off signal. Further, when the power supply control signal addressed to the ECU 2a is received, the input / output control circuit 24a receives a CAN transmission / reception signal between the CAN transceiver 22a and the microcomputer 20a. Shut off the output.
- the connection between the CAN transceiver 22a and the microcomputer 20a may be physically cut off, or the microcomputer 20a may be turned off to prevent the microcomputer 20a from receiving a CAN communication signal logically.
- the reception signal input from the CAN transceiver 22a may be logically blocked so as not to be input to the reception terminal Rx of the microcomputer 20a.
- the power control signal received for the ECU 2a is a signal to turn on the power
- the input / output control circuit 24a inputs the power on signal to the power circuit 21a, and the CAN transceiver 22a and the microcomputer 20a The communication is disconnected and the communication is restored.
- the ECU 2a configured as described above determines whether or not the microcomputer 20a itself shifts to the power-off state, and when shifting, the ECU 2a outputs a power-off request signal to the input / output control circuit 24a and supplies power. Stop. In this case, in the power-off state, the ECU 2a ignores the CAN communication signal transmitted to the CAN bus 3 and does not enter the operating state. This is because the input / output control circuit 24a blocks the input / output of the CAN communication signal. Even if the input / output control circuit 24a does not exist, the microcomputer 20a is not activated even if a CAN reception signal is input in a state where the power is not supplied to the microcomputer 20a.
- the ECU 2a and the ECU 2b can maintain the power-off state, and the entire in-vehicle communication system It is possible to reduce power consumption.
- FIG. 5 is a flowchart showing an example of a processing procedure in the master ECU 1 in the present embodiment.
- the processing procedure when requesting the ECU 2a already in the power-off state to unlock the door lock will be described.
- the microcomputer 10 of the ECU 1 can detect the power-off state of the ECU 2a depending on the situation where CAN communication with the ECU 2a is not performed.
- the microcomputer 10 determines whether there is a door lock unlocking request based on the CAN message received by the CAN transceiver 12 and obtained at the receiving terminal Rx (step S11). For example, when the driver turns on a switch for unlocking the door lock while traveling in the driver's seat, the ECU that inputs information from the switch transmits a CAN message for unlocking the door lock to the CAN bus 3. Is done. At this time, the ECU 2a is already in a power-off state and cannot receive the CAN message.
- microcomputer 10 determines that there is no request for unlocking the door lock (S11: NO), the process is terminated.
- the microcomputer 10 periodically repeats the process of FIG. Therefore, the process starts again from step S11.
- the microcomputer 10 determines that there is a request for unlocking the door lock (S11: YES)
- the microcomputer 10 outputs a power control signal for instructing power-on of the ECU 2a from the output terminal by serial communication (step S12).
- the power control signal output from the microcomputer 10 is transmitted to the CAN bus 3 by the signal superimposing circuit 13.
- the microcomputer 10 outputs a CAN message that is a door lock unlocking request from the transmission terminal Tx (step S13), and ends the process.
- the CAN message output from the transmission terminal Tx of the microcomputer 10 is transmitted to the CAN bus 3 via the signal superimposing circuit 13 by the CAN transceiver 12.
- the microcomputer 10 confirms whether or not the door lock is unlocked based on information obtained by CAN communication, and outputs a power control signal and a CAN message a plurality of times until unlocked. It may be.
- the microcomputer 10 determines whether the ECU 2a, the ECU 2b, the ECU 2c, and the ECU 2d are not limited to the processing procedure shown in the flowchart of FIG. If it is determined that it is necessary (S11: YES), a power supply control signal indicating power off or power on is output (S12). In the flowchart of FIG. 5, the microcomputer 10 determines that there is a door lock unlocking request as a basis for determining that it is necessary to turn on the power in step S ⁇ b> 11. Although the step (S13) of transmitting was performed, the step of transmitting a CAN message by CAN communication is not essential.
- FIG. 6 is a flowchart showing an example of a processing procedure in the input / output control circuit 24a of the ECU 2a in the present embodiment.
- the processing procedure in the ECU 2a is the same as the processing procedure in the other slave ECUs 2b, 2c and 2d. Therefore, the details of the processing procedure in the ECU 2a will be described below, and the detailed description of the processing procedures in the other ECU 2b, ECU 2c and ECU 2d will be omitted.
- the input / output control circuit 24a of the ECU 2a determines whether or not a power supply control signal addressed to itself (ECU 2a) has been received from the signal separation circuit 23a (step S21). If the input / output control circuit 24a determines that the power supply control signal addressed to itself is not received (S21: NO), the process returns to step S21.
- the power control signal is a signal for instructing to turn on the power.
- a power-on signal is input (step S22), the interruption between the transmission / reception terminals Tx, Rx of the microcomputer 20a and the CAN transceiver 22a is released (connected) (step S23), and the process is terminated.
- the input / output control circuit 24a determines whether or not a power-off request signal is input from the microcomputer 20a (step S24). If the input / output control circuit 24a determines that the power-off request signal has been input (S24: YES), the input / output control circuit 24a inputs the power-off signal to the power circuit 21a (step S25) and ends the process. In this case, since the microcomputer 20a is turned off, communication between the CAN transceiver 22a and the microcomputer 20a is cut off. At this time, the input / output control circuit 24a outputs a power-off signal to the power circuit 21a in step S25, and then intentionally disconnects the physical connection between the microcomputer 20a and the CAN transceiver 22a. Also good.
- the input / output control circuit 24a determines whether or not the received power control signal is a power control signal indicating power on after step S21. If it is determined that the power control signal indicates that the power is on, the processes in steps S22 and S23 are performed. Conversely, if it is determined that the received power control signal is a power control signal indicating power off, the process of step S25 is performed. Also in this case, the physical connection between the microcomputer 20a and the CAN transceiver 22a may be cut off.
- FIG. 7 is a flowchart showing an example of a processing procedure when the microcomputer 20a of the ECU 2a in this embodiment is turned on.
- the microcomputer 20a is activated when the power supply circuit 21a accepts an input of a power-on signal and starts supplying power (step S31), and acquires a CAN message transmitted by CAN communication through the transmission / reception terminals Tx and Rx (step S32). ).
- the microcomputer 20a determines whether or not the acquired CAN message is a request for unlocking the door lock (step S33). If it is determined that the request is an unlock request (S33: YES), the unlocking process for the door lock is performed. (Step S34) to finish the process. If the microcomputer 20a determines in step S33 that it is not an unlocking request (S33: NO), it immediately ends the process.
- the master ECU 1 and the slave ECU 2a, ECU 2b, ECU 2c, and ECU 2d transmit and receive power control signals in a manner that can be superimposed on CAN communication, whereby the slave ECU 2a, ECU 2b, ECU 2c, and ECU 2d are individually powered. It becomes possible to turn on (or power off), and the power consumption of the entire in-vehicle communication system can be reduced.
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Abstract
Description
なお、以下に説明する実施の形態では、本発明を、車両に搭載される複数のECUを接続する車載通信システムに適用した例を挙げて説明する。
10 マイコン(処理部)
12 CANトランシーバ(通信部)
13 信号重畳回路(送信部)
2a,2b,2c,2d ECU(処理装置、他の処理装置)
20a マイコン(処理部)
21a 電源回路(電源制御部)
22a CANトランシーバ(通信部)
23a 信号分離回路23a(受信部)
24a 入出力制御回路(入出力部)
Claims (10)
- 入力される信号に対し、信号処理を行なって出力する処理部と、2本の信号線を含む通信線に接続され、該通信線へ第1の通信方式に基づき差動信号にて送信された信号を受信して前記処理部へ出力し、前記処理部から出力される信号を第1の通信方式に基づき前記通信線へ送信する通信部と、前記処理部への外部からの電力供給のオン/オフを制御する電源制御部とを備える複数の処理装置を通信線を介して接続してある処理システムにおいて、
前記複数の処理装置の内、一の処理装置では、
前記処理部が、他の処理装置へオン/オフを制御する制御信号を出力するようにしてあり、
前記処理部が出力する前記他の処理装置への前記制御信号を、第2の通信方式に基づき前記通信線の信号線へ同相で送信する送信部を備え、
他の処理装置は、
前記通信線から第1の通信方式に基づく第1信号及び第2の通信方式に基づく第2信号を各受信する受信部を備え、
該受信部によって受信された第1信号は前記通信部へ、第2信号は前記電源制御部へ入力されるようにしてあり、
前記電源制御部は、入力された信号に基づき電力供給のオン/オフを制御するようにしてあること
を特徴とする処理システム。 - 前記他の処理装置は、
前記受信部により受信されて前記通信部にて入力され、前記通信部から前記処理部へ出力される第1信号と、前記受信部により受信された第2信号とを入力し、入力した信号に基づき前記電源制御部及び前記処理部へ各信号を出力する入出力部を更に備え、
該入出力部は、
入力した第2信号が、オフを示す制御信号であるか否かを判断する判断手段と、
該判断手段がオフを示す制御信号であると判断した場合、前記通信部と前記処理部との間の通信を遮断する手段と
を備えることを特徴とする請求項1に記載の処理システム。 - 前記入出力部は、
前記判断手段がオンを示す制御信号であると判断した場合、前記電源制御部にて電力供給をオンとすると共に、前記通信部と前記処理部との間の通信の遮断を解除するようにしてあること
を特徴とする請求項2に記載の処理システム。 - 前記制御信号は、電源オン/オフを制御する対象の処理装置を特定する宛先情報を含み、
前記入出力部は、
入力した第2信号が自身宛であるか否かを判断する手段を更に備え、
該手段が否と判断した場合に入力した第2信号を無視するようにしてあること
を特徴とする請求項2又は3に記載の処理システム。 - 前記制御信号は、複数の他の処理装置毎の電源オン/オフを示す情報を含むこと
を特徴とする請求項2又は3に記載の処理システム。 - 第2の通信方式の通信速度は、第1の通信方式の通信方式よりも低速であること
を特徴とする請求項1乃至5のいずれかに記載の処理システム。 - 第1の通信方式は差動信号であり、第2の通信方式はシリアル通信であること
を特徴とする請求項1乃至6のいずれかに記載の処理システム。 - 入力される信号に対し、信号処理を行なって出力する処理部と、2本の信号線からなる通信線に接続され、該通信線へ第1の通信方式に基づき差動信号にて送信された信号を受信して前記処理部へ出力し、前記処理部から出力される信号を第1の通信方式に基づき前記通信線へ送信する通信部とを備える処理装置において、
前記処理部が、他の処理装置へオン/オフを制御する制御信号を出力するようにしてあり、
前記処理部が出力する他の処理装置への前記制御信号を第2の通信方式に基づき前記通信線の信号線へ同相で送信する送信部を備えること
を特徴とする処理装置。 - 入力される信号に対し、信号処理を行なって出力する処理部と、2本の信号線を含む通信線に接続され、該通信線へ第1の通信方式に基づき差動信号にて送信された信号を受信して前記処理部へ出力し、前記処理部から出力される信号を第1の通信方式に基づき前記通信線へ送信する通信部と、前記処理部への外部からの電力供給のオン/オフを制御する電源制御部とを備える処理装置において、
前記通信線から第1の通信方式に基づく第1信号及び第2の通信方式に基づく第2信号を各受信する受信部を備え、
該受信部によって受信された第1信号は前記通信部へ、第2信号は前記電源制御部へ入力されるようにしてあり、
前記電源制御部は、入力された信号に基づき電力供給のオン/オフを制御するようにしてあること
を特徴とする処理装置。 - 入力される信号に対し、信号処理を行なって出力する処理部と、2本の信号線を含む通信線に接続され、該通信線へ第1の通信方式に基づき差動信号にて送信された信号を受信して前記処理部へ出力し、前記処理部から出力される信号を第1の通信方式に基づき前記通信線へ送信する通信部と、前記処理部への外部からの電力供給のオン/オフを制御する電源制御部とを備える複数の処理装置を通信線を介して接続してある処理システムにて、前記複数の処理装置の消費電力を制御する電源制御方法であって、
前記複数の処理装置の内、一の処理装置では、
前記処理部が他の処理装置へオン/オフを制御する制御信号を出力し、
前記処理部が出力した前記他の処理装置への前記制御信号を第2の通信方式に基づき前記通信線の信号線へ同相で送信し、
他の処理装置は、
前記通信線から第1の通信方式に基づく第1信号及び第2の通信方式に基づく第2信号を各受信し、
受信した第1信号は通信部にて受信し、
受信した第2信号は前記電源制御部へ入力し、
前記電源制御部は、入力された制御信号に基づき電力供給のオン/オフを制御する
ことを特徴とする電源制御方法。
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CN103457813A (zh) * | 2012-05-30 | 2013-12-18 | 通用汽车有限责任公司 | 配件用模块设备和用于在车辆总线上通信的方法 |
CN108808811A (zh) * | 2017-05-01 | 2018-11-13 | 拉碧斯半导体株式会社 | 半导体装置、电池监视***以及半导体装置的启动方法 |
CN108808811B (zh) * | 2017-05-01 | 2023-12-05 | 拉碧斯半导体株式会社 | 半导体装置、电池监视***以及半导体装置的启动方法 |
JP2020065189A (ja) * | 2018-10-18 | 2020-04-23 | 矢崎総業株式会社 | 通信システム |
US11082253B2 (en) | 2018-10-18 | 2021-08-03 | Yazaki Corporation | Communication system |
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DE112011102625B4 (de) | 2016-08-18 |
CN103053137A (zh) | 2013-04-17 |
US20130103959A1 (en) | 2013-04-25 |
JP2012038040A (ja) | 2012-02-23 |
US9256260B2 (en) | 2016-02-09 |
CN103053137B (zh) | 2015-07-22 |
DE112011102625T5 (de) | 2013-06-27 |
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