Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kasiha

Yuki Iwagami

Manabu Yamashita

Koji Hashimoto

Kohji Hashimoto

Akihiro Ishii

Junya Tanaka

Katsuya Nakamoto

Mitsunori Nishida

Masanori Kurimoto

Susumu Tanaka

Shoso Tsunekazu

Tetsushi Watanabe

Hiroshi Gokan

Osamu Nishizawa

Yuji Zushi

Junji Tada

Yoshitake Nishiuma

Takayuki Yanai

Tomoki Yamamoto

Masamitsu Uchiyama

Takatoshi Murakami

Provided is a gain control amplification device having a wide range and high accuracy and configured to adapt measurement target current to the input range of an A/D converter. The gain control amplification device includes: a plurality of differential amplifiers having different gains with respect to measurement target current or voltage; a threshold control circuit for comparing output of the differential amplifier with threshold voltage; a switch for selecting output of one of the plurality of differential amplifiers on the basis of output of the threshold control circuit; and an offset control circuit OF and an addition circuit for adding offset voltage to output of one of the differential amplifiers.

Gain control amplification device

Even when parts having individual differences among identical parts or differences in deterioration speed between parts, or a part that does not have a non-volatile memory such as an EEPROM in a chip of the part itself, are mixed, there is no deterioration diagnosis device that can appropriately diagnose a state of deterioration due to temporal change or the like, because of which a mechanism (correction methodology) for evaluating and correcting deterioration in the precision or performance of an electronic part that has low precision or considerable temporal deterioration, and does not have a correction function, is incorporated in a deterioration diagnosis device, and a deterioration state is diagnosed using incorporated deterioration determination means when using a product after shipping.

Deterioration diagnosis device

A downlink communication data DND from a main control circuit section to a combination control circuit section is divided into first and second downlink data, high-speed communication using a downlink clock signal and a transmission start instruction signal is performed, a high-speed load which has been directly driven from the main control circuit section is indirectly driven at high speed from the combination control circuit section by the first downlink data, a low-speed analog input signal ANL which has been indirectly inputted to the combination control circuit section is inputted to a specific input channel of a multi-channel converter through an indirect multiplexer, and channel selection is made by the downlink communication data.

Onboard electronic control unit

To provide a semiconductor device for driving an electric load to be divided into a plurality of opening/closing devices so that when an abnormality exists in any one of the division devices, that division device can be removed and replaced by an auxiliary device. Each of a plurality of opening/closing circuit units has an upper-side opening/closing device and a lower-side opening/closing device; while load driving is stopped, there is monitored the potential of the connection point between the upper and lower opening/closing devices at a time when any one of the opening/closing devices is closed or both of them are opened, and it is determined whether there exists short-circuit abnormality or disconnection abnormality in each of the opening/closing devices. When abnormality exists, the upper and lower opening/closing devices are removed and the auxiliary circuit is made effective.

Load-driving integrated circuit device

A first monitoring control circuit unit monitors controlling operation of an engine control unit (ECU); when the occurrence frequency of an abnormality becomes the same as or larger than a predetermined threshold value, a first storage circuit stores that occurrence frequency and a first cutoff circuit de-energizes an intake valve opening degree control motor for an air-intake throttle so as to set the intake valve opening degree to a fixed intake valve opening degree; a second monitoring control means monitors controlling operation of a transmission control unit (TCU); when the occurrence frequency of an abnormality becomes the same as or larger than a predetermined threshold value, a second storage circuit stores that occurrence frequency and a second cutoff circuit de-energizes a gear-shifting electromagnet valve so as to set the transmission ratio to a fixed transmission ratio.

Vehicle electronic control apparatus

There is provided a vehicle engine control system that includes engine and transmission control functions and enables evacuation driving to be readily performed. A monitoring control circuit unit and an error processing circuit unit monitors controlling operation of a main control circuit unit; when the occurrence frequency of valve-opening control abnormality becomes larger than threshold value, a first storage circuit stores the occurrence frequency, and driving of an intake valve control motor is stopped to set to fixed opening degree; when transmission-control abnormality is occurs, power supply to automatic transmission is stopped to set to the third speed fixation ratio; when an abnormality occurs, evacuation driving is implemented using fixed opening degree and automatic transmission ratio, variable rotation speed and fixed transmission ratio, or fixed opening degree and fixed transmission ratio. When valve-opening control abnormality or transmission-control abnormality occurs, fuel injection control is prevented from being inappropriately stopped.

Vehicle engine control system

A first external tool (A) serially connected to an electronic controller (A) through a pair of communication lines (LANH, LANN) applies a high voltage (Vaa) higher than a normal control voltage (Vcc) to the communication line (LANH) when a program is written. The electronic controller (A) recognizes connection of the first external tool (A) by a comparison circuit (A) for monitoring a received voltage and a write-mode determination circuit (A), initializes a microprocessor (), and receives and stores an total control program (TCPRG) in a program memory (A) based on a content of a boot program memory (). During an operation of the electronic controller (A), the external tool (A) is removed and the high voltage (Vaa) is not applied to the communication line (LANH). Therefore, the electronic control apparatus is not erroneously placed in the write mode.

Electronic controller to be connected to program tool

A driving deviceincludes: a fault detection devicethat determines a fault in an actuator; a serial interfacethat communicates with an MCU; a memory devicethat stores a program received from the MCUand a fault determination result by the fault detection device; a CPUthat causes the fault detection deviceto execute the fault determination according to a fault determination request from the MCU; a timer devicethat measures a limit time over which fault determination is performed and a determination period of fault determination; and a counter devicethat counts the number of repeats of fault determination and the number of fault occurrences in the actuator

Driving device

There is provided a low-cost electronic control unit that is capable of performing its hardware check every start and stop of the electronic control unit. A monitoring and control circuit section that is an integrated circuit element built in the electronic control unit includes a self-test circuit configured with a built-in self-test control block, scan chain circuits and mask circuitry, and performs a self-test using the built-in self-test control block and a partial combination of the scan chain circuits at start of the operation. In the shipment inspection of the integrated circuit element alone, an external test is performed by a checker microprocessor using an entire combination of the scan chain circuits. Thus, the electronic control unit of low-cost configuration is capable of performing a scan test by making use of part of the scan chain circuits designed for the component inspection.

Electronic control unit having integrated circuit element and standalone test unit for integrated circuit element

In a vehicle-mounted electronic control device having a switching power supply in which a switching element is controlled to obtain a predetermined intermediate voltage Va stepped down from a vehicle-mounted battery, and to which a downstream side coil, a flywheel diode, and an output capacitor are connected to suppress a pulsating voltage, a circuit for suppressing reverse conduction for the switching element is provided in order to prevent that the switching element is reversely conducted and thus a charging voltage of the output capacitor is abnormally lowered when a power supply voltage Vb of the vehicle-mounted battery is abnormally lowered.

Vehicle-mounted electronic control device

An electronic control apparatus is provided in which a supervisory control circuit part capable of mutual communication with a main control circuit part, which is operated by a high speed clock signal of high precision, is operated by a medium speed clock signal, which is low in cost and precision, such that they can operate mutually independently of each other. The main control circuit part supplies a medium speed communication synchronization signal frequency divided to the supervisory control circuit part. The supervisory control circuit part is operated by the medium speed clock signal to supervise the control operation of the main control circuit part. An error measuring circuit calculates an error correction coefficient which is the ratio of the signal cycle of the communication synchronization signal to that of the medium speed clock signal. The value of the error correction coefficient is reversely supervised by the main control circuit part.

Electronic control apparatus

An in-vehicle electronic control apparatus includes a monitoring control circuit configured such that a monitoring control circuit unit transmits question information; a main control circuit unit transmits answer information generated by a microprocessor; the monitoring control circuit unit applies an addition and subtraction correction to a value of a first present-value memory in response to a result of a comparison between correct-solution information stored in a data memory and the answer information; and when the accumulated present value exceeds an abnormality determination threshold value, the monitoring control circuit unit generates a first abnormality detection signal so as to initialize and restart the microprocessor, and variably sets the abnormality determination threshold value or an abnormality determination time, based on selectively applied setting constants generated with pattern switches.

In-vehicle electronic control apparatus having monitoring control circuit

An on-vehicle electronic control deviceA serially transmits A/D conversion data of plural channels from a second control circuit unitA including a multichannel A/D converterA to a microprocessorA disposed in a first control circuit unitA. The A/D conversion data are organized into a communication packet and transmitted via first and second buffer memoriesand, and when there is an abnormality in the A/D conversion data, transfer between the first and second buffer memoriesandis prohibited and an abnormality report is performed with respect to the microprocessorA. As a result, erroneous data are not transmitted, and communication congestion and the burden of the microprocessorA are alleviated.

On-vehicle electronic control device

An in-vehicle electronic control apparatus, having a monitoring control circuit, according to the present invention is configured in such a way that serial interface circuitsandare connected between a main control circuit unitA and a monitoring control circuit unitA, high-speed full-duplex block communication is performed by use of a communication permission signal ALT and a communication synchronization signal CLK, the same question information included in uplink communication information UPD is recurrently transmitted in a plurality times of communication and updated after being transmitted a predetermined times, and the main control circuit unitA returns answer information by use of downlink communication information DND, within a predetermined duration after the update of the question information; because the question update period is prolonged, the control load on the main control circuit unitA is reduced.

In an in-vehicle mount electronic controller, a constant-voltage power supply generates a high-precision small-capacity 5V output voltage Vad, a low-precision large-capacity 5V output voltage Vif and a low-precision large-capacity 3.3V output voltage Vcp, and also generates at least one of a low-precision small-capacity 2.8V output voltage Vup and a high-precision small-capacity 3.3V output voltage Vsb. A judgment signal input circuit logically combines comparison results of divided voltages of the above output voltages Vif, Vcp, Vup and Vsb with a divided voltage of the output voltage Vad as a reference voltage, and inputs relative voltage information ER, ER, ERand ERto a microprocessor. The microprocessor comprehensively judges the output voltages containing the comparison reference voltage, and reports abnormality or saves abnormality occurrence information.

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Tokyo, Japan

Yuki Iwagami