Abstract: An ECU monitoring device includes a driver's seat J/B ECU and an immobilizer ECU both connected to a main battery through a power line. In operation, the immobilizer ECU is formed so as to output a communication signal superimposed on the power line. While the driver's seat J/B ECU is formed so as to receive the communication signal from the power line. When the communication signal is not received by the driver's seat J/B ECU, it judges that the immobilizer ECU is disconnected from the power line on purpose or that a false instrument in place of the immobilizer ECU is connected to the power line falsely. In this way, the ECU monitoring device allows the driver's seat J/B ECU to monitor a connection between the power line and the immobilizer ECU to be monitored.

Abstract: An ASK communication device has a carrier signal generator which is connected to a bus line which outputs carrier signals. One of ECUs, which attempts to transmit data, attenuates carrier signals superimposed on the bus line with predetermined timing by use of a transmission switch and a signal attenuator thereby to cause ASK modulation of the carrier signals. Other ECUs receive the ASK-modulated data superimposed on the bus line by use of a receiver, and obtain data by demodulating the ASK-modulated data.

Abstract: An ASK communication device includes a master station and slave stations connected to the master station through a bus line. The master station includes a transmission unit for ASK-modulating a carrier signal outputted from an oscillation circuit owned thereby and outputting, to a bus line, ID signals of the respective stations and data transmitted to the respective slave stations in a case of transmitting the data from the master station, and outputting the ID signal of the slave station as a transmission source and the carrier signal to the bus line in a case of transmitting the data from the slave station, and a master-side reception unit for receiving, through the bus line, the data transmitted from the slave station. The at least one slave station includes a slave-side reception unit for receiving the data transmitted from the master station and other slave stations, and an attenuation unit for attenuating and ASK-modulating the carrier signal outputted from the master station to the bus line.

Abstract: A master station includes a main clock generator using a high precision oscillator such as a crystal oscillator or a ceramic oscillator, and generates a carrier signal used for ASK modulation of a transmission signal in response to the clock signal outputted from the main clock generator. A slave station uses sampling means to sample the carrier signal sent from the master station, and generates a carrier signal used for ASK modulation of a transmission signal based on the sampling data.

Abstract: An ECU monitoring device includes a monitoring ECU connected to a power line for supplying power from a main battery to an immobilizer ECU. The monitoring ECU includes a high-frequency signal generating circuit for superimposing a high-frequency signal on the power line, a high-frequency signal detecting circuit for detecting the high-frequency signal superimposed on the power line and a CPU for judging a connection between the power line and the immobilizer ECU or between the power line and a false instrument. With the constitution, the ECU monitoring device can detect a situation that the immobilizer ECU is detached from a vehicle with high accuracy, preventing the vehicle from being stolen by theft.

Abstract: In a relay unit, a communication signal is blocked and separated by a separator inserted to a power line. The communication signal provided from one end or another end of the separated power line through a switch is received by a receiver. The received communication signal is relayed by a processor, and the relayed communication signal is transmitted from a transmitter to the one end or the other end of the power line.

Abstract: A power line communication device for vehicle includes a voltage follower (4), which is configured to receive a reception communication signal with an input terminal, to generate a standard level for comparison which follows direct-current voltage fluctuation at the input terminal, and to output the standard level for comparison and the communication signal. The power line communication device for vehicle includes a comparator unit (5), which is configured to compare the standard level for comparison outputted from the voltage follower (4) with the reception communication signal, and to amplify the communication signal which is superimposed and modulated on direct-current power on a power line (11).

Abstract: A power line communication device for a vehicle is provided with an internal electronic control unit connected to a connection point on a power line, which communicates with an external electronic control unit by a communication signal superimposed on a supply voltage applied to the power line, and an impedance element inserted between the connection point and an external load. The impedance element suppresses attenuation of the communication signal.

Abstract: A power line communication device for a vehicle detects a communication signal received through a power line and extracts incoming data composed of a digital signal. The device dulls a waveform of the digital signal of the incoming data by use of a resistor and a capacitor, and thereby converts the incoming data into an analog signal. Thereafter, the device converts the analog signal into a digital signal by use of an inverter circuit based on a given threshold level, and thereby subjects the incoming data to waveform shaping.

Abstract: An electronic scanning ultrasonic object-detection apparatus 1 of the present invention comprises; phase control signal generation means 2 for generating a plurality of phase control signals having different transmission frequencies; ultrasonic wave transmission means 3 for transmitting ultrasonic waves of a transmission frequency different from each other by a plurality of arrays, based on the plurality of phase control signals; ultrasonic wave receiving means 4 for receiving reflected waves from an object of the ultrasonic waves with a plurality of receiving elements, judging a signal of the reflected waves received by all the receiving elements as a mail image to thereby output a mail image signal, and judging signals of other reflected waves as side images to thereby output a side image signal; and object-detection means 5 for detecting a position of an object based on the mail image signal output by the ultrasonic wave receiving means 4, and detecting existence of a side image based on the side image sig

Abstract: An electronic scanning ultrasonic object-detection apparatus 1 of the present invention comprises: phase control signal generation means 2 for generating phase control signals having the same transmission frequency; ultrasonic wave transmission means 3 for transmitting ultrasonic waves based on the phase control signals, by a plurality of arrays having a plurality of transmission elements arranged at a constant element interval, with the element interval being different for each array; ultrasonic wave receiving means 4 for receiving reflected waves from an object of the ultrasonic waves, and judging a signal Included in all the reflected waves as a main image to thereby output a main image signal, and judging other signals as side images to thereby output a side image signal; and object-detection means 5 for detecting a position of an object based on the main image signal and detecting existence of a side image based on the side image signal.

Abstract: A jacket with a multiband transmitter-receiver is constituted of: an antenna section 1 comprising a TV/radio (AM/FM) antenna 2, a mobile phone antenna 3, a transceiver antenna 4 and a GPS antenna 5; a multiband transmitter-receiver 6 having a universal tuner 7 and a control means 8; an I/O section 9 comprising a short-distance radio and a cable connector; a human interface section 10; and a sensor section 11, with these equipments attached respectively to the jacket.