Patent application number | Description | Published |
20110130110 | Receiver circuit adapted to communication apparatuses operative with different power voltage range - A LIN receiver includes a voltage divider that divides an input voltage and outputs the divided voltage, and a peak hold circuit that outputs a peak voltage of the input voltage. The LIN receiver is configured to generate a threshold voltage to be used for determining a voltage signal of a communication bus. The threshold voltage is generated from a voltage signal of the communication bus such that the peak value of the voltage signal (i.e., equivalent to a battery voltage) is held by the peak hold circuit and divided by the voltage divider. Although the communication bus is connected to an on-vehicle battery of which voltage varies with time, by using the voltage signal of the communication bus, a 5V system ECU can generate a threshold voltage which varies responding to the variation of the battery voltage. Hence, the voltage signal can be determined correctly as either high or low level. | 06-02-2011 |
20110158258 | Communication signal processing apparatus and communication apparatus - A communication signal processing apparatus includes: a transmitted-signal processing unit which, in accordance with a transmitted signal outputted from a communication control apparatus, transmits a communication signal indicating “dominant” via the communication line by applying a current to a communication line, and transmits a communication signal indicating “recessive” via the communication line by not applying a current to the communication line; and a received-signal processing unit which determines whether the communication signal received via the communication line indicates “dominant” or “recessive”, then outputs a received signal indicating the determination result to the communication control apparatus. The received-signal processing unit outputs a signal indicating “recessive” to the communication control apparatus as the received signal, regardless of the communication signal received via the communication line, during a signal-keeping period of time from the time when detecting a change from “dominant” to “recessive” based on the communication signal received via the communication line. | 06-30-2011 |
20110293036 | Communication signal generating device and communication apparatus for use in communication system - The communication signal generating device is for use in a communication system where communication signals each of which is set at a first level or a second level are exchanged among a plurality of communication apparatuses through a communication line. The communication signal generating device includes a switching element provided in a communication line to connect the communication line to a ground or a constant voltage source, and a driving means to generate a first communication signal at the first level by turning on the switching element to thereby pass a certain current to the communication line, and generate a second communication signal at the second level by turning off the switching element to thereby pass no current to the communication line. The driving means is configured to gradually increase an output impedance of the switching element during one bit time of the first communication signal. | 12-01-2011 |
20120004810 | Vehicle-use safety control apparatus - The vehicle-use safety control apparatus is configured to operate on electric power supplied from a vehicle battery mounted on a vehicle through at least one of a first electric power supply path interposed with an ignition switch of the vehicle, and a second electric power supply path interposed with a changeover switch. The vehicle-use safety control apparatus includes a running state information acquiring means to acquire running state information on whether the vehicle is running or stopped, and a switch control means to change an on/off state of the changeover switch in accordance with the running state information received from the running state acquiring means. | 01-05-2012 |
20120084378 | Communication system, master node, and slave node - A slave node communicably coupled to a master node via a bus determines determine whether an active communication mode or a passive communication mode is started based on a header transmitted from the master node. The slave node transmits the header and an ID subsequent to the header when it is determined that the active communication mode is started based on the received header. The ID requests active transmission of a response required to be transmitted in the active communication mode upon the slave node having the response. The slave node monitors arbitration on a bus, and transmits the response subsequent to the ID when the slave node wins the arbitration on the bus between the ID transmitted from the slave node and another information transmitted from another slave node communicably coupled to the master node via the bus based on a result of the monitor. | 04-05-2012 |
20120290753 | CONNECTION METHOD FOR BUS CONTROLLERS AND COMMUNICATION SYSTEM - A connection method for bus controllers is provided which includes using a logic circuit in which if both signal levels of two input terminals are recessive, a signal level of an output terminal becomes recessive, and if at least one of the signal levels of the two input terminals is dominant, a signal level of the output terminal becomes dominant, defining one of the two bus controllers, which are subject to one-on-one connection, as a first controller, defining the other of the two bus controllers as a second controller, connecting a transmitting terminal of the first controller to one of the two input terminals of the logic circuit, connecting a transmitting terminal of the second controller to the other of the two input terminals of the logic circuit, and connecting receiving terminals of the first and second controllers to the output terminal of the logic circuit. | 11-15-2012 |
20120314738 | TRANSCEIVER FOR COMMUNICATING SIGNAL ENCODED TO INCLUDE CLOCK INFORMATION - In a transceiver, a clock generator generates a second clock synchronized with a first clock. The second clock has a period corresponding to a duration of one bit of a digital signal. When first transmission data is supplied to the transceiver with being asynchronous to the second clock, a sampling timing generator detects start data of the first transmission data as a start timing, and generates sampling timings based on the first clock in response to the start timing. The sampling timings have intervals each of which is defined to correspond to the period of the second clock. The first sampling timing is spaced from the start timing. A sampling module samples, at each of the sampling timings, the first transmission data, thus generating second transmission data synchronized with the second clock. | 12-13-2012 |
20130034132 | TRANSCEIVER - An encoding circuit encodes a NRZ code into a transmission line code. A decoding circuit decodes the transmission line code into a NRZ code. If an operation-mode specified by a setting signal is a normal-mode, a transmission switching circuit provides transmit-data received from an input terminal to the encoding circuit to output the encoded transmit-data as communication-data from a communication terminal. If the operation-mode is a sleep-mode, the transmission switching circuit outputs the transmit-data received from the input terminal as the communication-data from the communication terminal. If the operation-mode specified by the setting signal is a normal-mode, a reception switching circuit provides the communication-data received from the communication terminal to the decoding circuit to output the decoded communication-data as receive-data from an output terminal. If the operation-mode is a sleep-mode, the reception switching circuit outputs the communication-data received from the communication terminal as the receive-data from the output terminal. | 02-07-2013 |
20130067129 | COMMUNICATION SYSTEM AND SLAVE NODE - In a slave node, a signal processor stores therein wakeup information uniquely defined for the slave node. The signal processor includes a writing unit configured to write the wakeup information into the transceiver at a given timing. A transceiver includes a memory. The wakeup information is written into the memory to be held therein. The transceiver includes a wakeup determiner. The wakeup determiner compares information received via the communication bus with the wakeup information held in the memory if the slave node is operating in the sleep mode, and determines whether the slave node should shift to the wakeup mode according to a result of the comparison. | 03-14-2013 |
20130151660 | DELAY SYSTEM, DELAY DEVICE AND COMMUNICATION DEVICE CONSTITUTING DELAY SYSTEM - A delay system which has a communications device connected to a communications network and a relay device which is connected between the communications network ad an external device. The relay device is configured to divide data received from the external device into a plurality of data fragments each containing divided data, and send a sequence of messages, the messages corresponding to the respective divided data and dummy messages being included in the sequence of messages according to a communications rule. The communications device is configured to reconstitute the data from the external device on the basis of the message group from the relay device according to the communications rule. | 06-13-2013 |
20130185766 | COMMUNICATIONS RELAY APPARATUS - A communications relay apparatus for relaying communications between an electronic control unit (ECU) connected to the apparatus via an in-vehicle local area network (LAN) and an external device connected to the apparatus via a communication path different from the in-vehicle LAN. In the apparatus, a data transfer unit forwards relay data received from the ECU to the communication path and forwards relay data received from the external device to the in-vehicle LAN. But the data transfer unit is inhibited from forwarding reprogramming data for reprogramming the ECU received from the external device to the in-vehicle LAN. An authentication unit authenticates a vehicle user, and when the vehicle user is successfully authenticated, then permits the data transfer unit to forward the reprogramming data to the in-vehicle LAN. | 07-18-2013 |
20130326255 | COMMUNICATION SYSTEM - A communication system includes a plurality of nodes performing communication via a common communication channel based on a communication protocol and including a first node or a second node. The first node transmits, to the communication channel, a wake-up frame as the communication frame for enabling the second node to transition from a sleep state to a normal state, determines whether or not the second node transitions to the normal state due to the wake-up frame, and generates an abnormal waveform pattern in the communication channel when determined that the second node does not transition to the normal state. The second node stores the identification information allocated to the second node, and enables the second node to transition from the sleep state to the normal state under on condition that the identification information included in the wake-up frame received from the communication channel is identical to the stored identification information. | 12-05-2013 |
20140036987 | DECODER FOR DECODING PWM CODE AND COMMUNICATIONS SYSTEM - A decoder for decoding an input signal coded with a pulse width modulation code as a line code to an output signal in a binary code, has a first memory, a first timer, a determination circuit and a first controller. The information on a duty duration of the PWM code, corresponding to at least one kind of the output signals, is stored on the first memory. The first timer has a capacity to measure the duty duration of the input signal. The determination circuit has a capacity to determining which kind of the output signals corresponds to the input signal, on the basis of the information stored on the first memory and the duty duration measured with the first timer. The first controller has a capacity to updating the information stored on the first memory, on the basis of the determination result and the measured duty duration. | 02-06-2014 |
20140036988 | TRANSCEIVER FOR SERIAL DATA COMMUNICATION UTILIZING PWM ENCODED SIGNAL - Serial data are transmitted between transceivers via a communication path, each bit expressed by a dominant code or a recessive code which vary between dominant and recessive levels, the dominant code having a greater proportion of duration at the dominant level. A device (clock master) can continuously output successive recessive codes to the communication path, in which condition a transceiver can transmit a dominant code by producing an output drive signal which overwrites a part of a recessive code, currently being received from the communication path, to the dominant level. The output drive signal is shaped with a steeper edge slope at a transition from an inactive to an active level than from the active to the inactive level, enabling an increased data transmission rate without increased noise. | 02-06-2014 |
20140047146 | COMMUNICATION LOAD DETERMINING APPARATUS - A communication load determining apparatus is used for a communication system which includes a plurality of communication devices performing communication via a common bus. The communication system operates in accordance with a communication protocol that defines which a priority order is set to each of the frames transmitted from the communication devices and which a frame having a lower priority has a longer transmission latency before being transmitted to the bus. In the communication load determining apparatus, a low-priority frame having a lower priority than other frames to the bus is transmitted, and a transmission latency of the low-priority frame is measured. The communication load determining apparatus determines whether or not abnormality has occurred in a communication load in the bus on the basis of the measured transmission latency to produce a determination result. The produced determination result is stored. | 02-13-2014 |
20140047255 | ON-BOARD NETWORK SYSTEM - An on-board network system is presented. The on-board network system sends a sleep-entered message to a communication bus. The sleep-entered message is sent under a condition that a sleep condition is satisfied on a basis that a network management (NM) message is ceased during state transition process in which node's state transfers from a normal state to a power-saving state. A monitoring ECU corresponding to a master performs an abnormality detection process. In the abnormality detection process, the monitoring ECU detects an abnormality state of the state transition process based on whether or not the sleep-entered message is sent from any one of nodes, thereby it is possible to detect the abnormality state not only during each node is a normal state but also during a bus-sleep state. | 02-13-2014 |
20140056388 | RECEIVER CIRCUIT - In a receiver circuit, a binary signal is generated based on a signal level of a received signal that has been received via a transmission line from a driver of a transmitter circuit. Then, a first stable state and a second stable state are detected based on a reference signal whose signal level changes in accordance with the received signal. In the first stable state, the received signal is stable at a first signal level. In the second stable state, the received signal is stable at a second signal level. When the first stable state is detected and the received signal is changed from the first signal level into the second signal level, the generated binary signal is retained at a signal level corresponding to the second signal level, until the second stable state is detected. | 02-27-2014 |
20140140390 | COMMUNICATION APPARATUS FOR TRANSMISSION OF BINARY CODED SIGNAL - A communication apparatus includes a detecting unit, a process performing unit, and a range setting unit. The detecting unit detects a boundary pattern periodically appearing between codes in a binary coded signal transmitted through a transmission line. The boundary pattern is information showing a boundary appearing between codes. The process performing unit performs a process in synchronization with timing of appearance of the boundary pattern. The range setting unit sets an allowance range which is set include timing at which it is estimated that the next boundary pattern appears. The timing is counted from the timing currently detected by the detecting unit. The detecting unit includes a section which detects the timing of appearance of the boundary pattern during the allowance range. | 05-22-2014 |
20140169419 | TRANSCEIVER AND COMMUNICATION APPARATUS TRANSMITTING AND RECEIVING DATA ENCODED BY TRANSMISSION CODE - A transceiver that transmits and receives data used in a communication system, in which the data is encoded by a transmission line code and a signal level of the transmission code changes at a predetermined transition timing in a bit-duration. The transceiver includes: a clock generator that generates an internal clock used for internal circuits; a timing generator that generates, by using the internal clock generated by the clock generator, a timing signal synchronized to a reference clock supplied externally; an encoding circuit that encodes, by using the timing signal generated by the timing generator, a transmission data which is synchronized to the reference clock to be the transmission line code; and a waveform shaping unit that performs a waveform shaping of a waveform at the predetermined is transition timing of the transmission data to be based on the reference clock. | 06-19-2014 |
20140355622 | COMMUNICATION SYSTEM - A communication system is provide which includes a plurality of communication units connected to a communication line, in which collisions occur between dominant signals outputted from the communication units on the communication line. At least one of the communication units includes a first driver which is set so that a variation of voltage applied to the communication line in transmission of the dominant signal with respect to that in absence of transmission of the dominant signal is smaller than a variation of voltage applied from another of the communication units to the communication line in transmission of the dominant signal. One of the communication units, which differs from the communication unit including the first driver, includes a second driver which limits variation per unit time of current flowing through the communication line in transmission of the dominant signal. | 12-04-2014 |
20150055696 | COMMUNICATION SYSTEM - A communication system performs communication using a pulse width modulation code as a transmission code. The communication system includes a plurality of nodes that are connected via a transmission line to be capable of communicating with each other. Each of the nodes including a driver circuit. The driver circuit includes a transistor that enables and blocks conduction between the transmission line and a ground line. The plurality of nodes includes a master node and a slave node. The master node is one of the plurality of nodes. The slave node is at least one node other than the master node among the plurality of nodes. The master node includes a limiter that restricts, when the transistor of the driver circuit is turned off, changes in a conductive state of the transistor. | 02-26-2015 |