Hitachi Astemo Ltd.

Hitachi, Ltd.

Renesas Technology Corp.

Hitachi Automotive Systems, Ltd.

Yasuo Shima

Yoichiro Kobayashi

Satoshi Tanaka

Yukinori Akamine

Manabu Kawabe

Masahiro Doi

Ryoichi Takano

Takeo Yamashita

Keishi Komoriyama

Hiroshi Kikuchi

Nobuyasu Kanekawa

Yasuyuki Kojima

Seigou Yukutake

Minehiro Nemoto

Takayuki Iwasaki

Atsushi Arata

Yasushi Sugiyama

Kazuhisa Takami

Yoshihisa Fujii

Yusuke Takeuchi

Yuri Ohara

Katsuya Sonoyama

Chihiro Mochizuki

Koji Shibata

A load drive device that drives and controls an inductive load based on a PWM signal from a microcomputer is provided, and the load drive device has excellent reliability and responsiveness capable of quickly detecting disconnection of the inductive load. The load drive device includes a microcomputer and a driver circuit that drives an inductive load by a pulse width modulation signal of a constant cycle based on a control command from the microcomputer, in which the driver circuit includes a current monitoring circuit that monitors a current flowing through the inductive load, and a disconnection diagnosis circuit that detects disconnection of the inductive load based on a current value detected by the current monitoring circuit, and the disconnection diagnosis circuit obtains a change amount of a current value detected by the current monitoring circuit, and when the change amount is equal to or less than a predetermined threshold, determines that the inductive load is disconnected and notifies the microcomputer of the disconnection.

Load drive device and method for controlling electronic control device

Poor opening is detected with certainty and reliability with respect to a ground line of an integrated circuit device regardless of the connection state of a load and the operating state of a drive circuit. In an integrated circuit device, a drive circuitswitches between conduction and interruption of a load current using switch elementsand. The ground lineis grounded via the GND terminalto the common ground provided outside the integrated circuit deviceand is connected to the drive circuit. The ground lineis grounded to the common ground via the GND terminaland is connected to the control circuit. The diagnostic current supply circuitsupplies a predetermined diagnostic current to the ground line. The rectifying elementsandare connected between the ground lineand the ground line. The diagnostic circuitmeasures the potential difference between the ground lineand the ground lineand compares the potential difference with the predetermined comparison voltageto diagnose the grounding state of the ground line

Integrated circuit device

Provided is a current control device capable of continuing feedback control for a solenoid in normal feedback control while preventing occurrence of an unintended valve operation due to flow of a reverse current.

Current control device for control of supply current with low-side and high-side switch elements and duration measurement

With a simple configuration, responsiveness between an electronic control unit and a load drive circuit is monitored without deteriorating characteristics of the load drive circuit. The load drive circuit according to the present invention diagnoses an abnormality in responsiveness of a switch element that drives a load based on a drive command of the switch element and a signal at an output terminal of the switch element.

Load drive circuit and load drive system

Provided is an electronic control unit capable of performing a high-accurate failure diagnosis in a short time as an electronic control unit having a failure diagnosis function. A load drive circuit that drives a load, a control circuit that controls the load drive circuit, and a diagnosis circuit that diagnoses an output state of the load drive circuit and outputs a diagnostic result to the control circuit are provided. The diagnosis circuit outputs a diagnosis completion flag indicating whether or not there is a diagnosis opportunity to the control circuit.

Electronic control unit

It is made possible to control ignition appropriately. An ignition devicefor an internal combustion engine includes a spark coilincluding: a primary side coilconnected to a direct current power supplyand a secondary side coilmagnetically connected to the primary side coiland connected to an ignition plug; a switch elementthat performs switching between energization and interruption of primary current Ito the primary side coil; and a switch element controlling circuitthat controls the switch elementon the basis of an ignition controlling signalsupplied from an ECU. A turn-on delay adjustment circuitthat delays a control timing of the switch elementis disposed between the ECUand the switch elementsuch that first resonance noise generated due to interruption of the primary current Ito the primary side coilis reduced.

Ignition device for internal combustion engine

An electronic control device has a compact abnormality detection circuit that does not require a complicated circuit, and is capable of suppressing a cost increase when being applied a direct injection injector drive circuit and other drive circuits. A current detection circuit includes a current detection resistor, a differential amplifier, and a current detection unit. The current detected is supplied to the abnormality/normality determination unit. A combined resistance value of a diagnostic current drive circuit and the current detection resistor is higher than an injector drive circuit. A fuel injection signal is input to a logic circuit, and a fuel cut signal is input to a different terminal of the logic circuit. The logic circuit's output terminal is connected to the injector drive circuit's gate. The output signal from a fuel injection signal output unit is supplied via a switch to the diagnostic current drive circuit's gate.

Electronic control device and abnormality/normality determination method of electronic control device

A semiconductor package includes a print circuit part, a lower chip, an upper chip, a thermal conductivity part, and an encapsulation resin. The lower chip and the upper chip are mounted on the print circuit part through wire bonding connection. The thermal conductivity part efficiently dissipates heat from the chips to the outside of the package. The encapsulation resin entirely seals the package while exposing the thermal conductivity part. A adhesive sheet is hardened to form a bonding layer between the thermal conductivity part and the upper chip, a bonding layer between the semiconductor chips, and a bonding layer between the semiconductor chip and the wired component. The configuration contributes to miniaturization, high integration, and heat resistance reduction of a semiconductor package using high-heat-generating ICs.

Semiconductor device with exposed thermal conductivity part

A driver circuit transmits a signal generated by a signal level generation circuit to a circuit to be measured by transmitting the signal to a output buffer circuit via a circuit (prebuffer circuit) that drives the output buffer circuit and causing the output buffer circuit to drive a transmission line. The driver circuit includes the prebuffer circuit and a replica buffer circuit formed by imitating the prebuffer circuit. The prebuffer circuit and the replica buffer circuit are disposed in parallel. The driver circuit temporarily increases input bias current to be supplied to output-stage transistors of the output buffer circuit on the basis of output current of the replica buffer circuit during transition of an input or output signal.

Driver and output buffer circuit

A PLL circuit equipped with a loop gain detecting circuit that can suppress the change of the loop gain. When detecting the loop gain, the frequency of the input signal to the second input (IN-) of the phase detector is first changed, and the response corresponding to the change is detected by the output of the voltage locked oscillator. The detection is performed by connecting the output of the voltage locked oscillator with the counter and connecting the output of the counter with the integrator. The phase locked loop characteristics are optimized by performing feedback for the detection result on the value of the charge pump current.

Phase locked loop circuits, offset PLL transmitters, radio frequency integrated circuits and mobile phone systems

In order to reduce the consumption of power of an isolator interface and an ADC, it is proposed to operate a calling signal reception or Caller ID signal reception function only with power supplied from the system switch while maintaining the on-hook condition of a telephone. At the time of normal operation, the output of the analogue digital converter is input to an isolator through the isolator interface, and at the time of the calling signal reception or the caller identification information reception, the output of the analogue digital converter is input directly to the isolator.

Growing community of inventors

Ome, Japan

Yasuo Shima