Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.

Kyohei Watanabe

Makoto Hattori

Takayuki Takashige

Kenichi Aiba

Toyohisa Kawashima

Masato Ito

Hiroto Higuchi

Makoto Takeuchi

Kenji Shimizu

Koji Nakano

Masahiro Mori

Hiroyuki Kamitani

Takashi Nakagami

Akinori Yoshioka

Katsuhiro Saito

Tomoki Hase

Naoki Nishikawa

Shinya Hamamoto

Takashi Mitsumata

Sachiko Nakao

Hiroaki Yamato

A control device that includes an electric detection unit which detects an electric physical quantity relating to a head capacitor provided between a DC power supply and an inverter switching element; and a protection control unit which controls the inverter switching element in accordance with a change in the electric physical quantity so that no electric current flows to the head capacitor.

Protection control unit for an inverter controlling current flow to a head capacitor

This electric compressor control device comprises: a control unit of an inverter which controls a motor that drives a compressor; a physical quantity calculation unit which calculates, on the basis of one or a plurality of predetermined detection values acquired from the inverter, a physical quantity that varies depending on a workload of the compressor; a number-of-revolutions acquisition unit which acquires the number of revolutions of the motor; a storage unit which stores information representing a first threshold that varies depending on the number of revolutions of the motor, and defines whether or not the physical quantity is a normal value; and a refrigerant abnormality determination unit which determines whether or not there is an abnormality in a refrigerant system by comparing the calculated physical quantity with the first threshold, depending on the acquired number of revolutions.

Electric compressor control device, electric compressor, and electric compressor control method

This control device controls an inverter for driving a load, the control device comprising: a first generation unit for generating a first signal for performing two-phase modulation if a three-phase alternating current voltage for driving the load is generated; an acquisition unit for acquiring the weight of the load; a storage unit for storing corresponding relationships between the weight of the load and a phase shift amount of the first signal; an identification unit for identifying the phase shift amount corresponding to the weight of the load acquired by the acquisition unit in the corresponding relationship; and a second generation unit for generating a second signal in which the phase shift amount has been altered from the first signal on the basis of the phase shift amount identified by the identification unit.

Control device, inverter system, control method, and program

Provided is a method for continuing the operation of an electric compressor even if the magnitude of ripple voltage exceeds a predetermined threshold value. A control device of an electric compressor is provided with: a detection unit for detecting the ripple voltage of the electric compressor which is driven by a battery; a determination unit for determining whether or not the value of the ripple voltage is greater than or equal to a predetermined threshold value; and a control unit for reducing the rotation speed of a motor of the electric compressor down to a predetermined first target rotation speed greater than 0 when the value is greater than or equal to the threshold value.

Control device, electric compressor, control method, and program

Provided is a method for detecting a ripple voltage. A control device is provided with: an acquiring unit which acquires the voltage value of an input voltage of a battery-driven electric compressor at irregular intervals; and a waveform computing unit which computes the waveform of a ripple component of the input voltage on the basis of the acquired voltage value.

Control device, electric compressor, ripple voltage detecting method, and program

Provided is a method for determining the generation source of ripple voltage when abnormal ripple voltage is detected. The control device is for an electric compressor, the control device comprising: a detection unit that detects ripple voltage; a judgment unit that judges whether the ripple voltage is abnormal based on the value of the ripple voltage; and a cause determination unit that determines whether the cause of the abnormality is the electric compressor or some other external device, based on the control result of the electric compressor.

Control device, electric compressor, ripple voltage abnormality cause determination method and program

This vehicle-mounted electric compressor is provided with a compressor body including a motor for compressing a refrigerant, and an inverter including a power element for supplying the motor with electric current. The power element is provided with: a metal substrate having an electrically conductive layer in a partial region of the surface thereof; a heat-generating element having a metal layer solder-fixed to the electrically conductive layer; and a resin substrate which is disposed in parallel with the metal substrate in a plate thickness direction of the metal substrate, and has a metal pattern printed on the surface thereof, the metal pattern having an electronic component mounted thereon. The electronic component and a terminal of the heat-generating element are connected by means of the metal pattern.

Vehicle-mounted electric compressor

A current estimating device that estimates a capacitor current of a high-voltage circuit for driving a motor, wherein the current estimating device calculates a voltage utilization rate using the input voltage of an inverter included in the high-voltage circuit and the speed of the motor, calculates a first constant by applying the voltage utilization rate to a predetermined first arithmetic expression, and calculates the capacitor current of an electrical condenser included in the high-voltage circuit by multiplying the first constant by a motor current effective value.

Current estimating device, electric compressor, current estimating method, and motor current effective value estimating method

A motor control device provided with a control unit which controls the number of rotations of a motor by implementing a first control which enables high-torque and precise control, or a second control enabling more efficient control than the first control with respect to the motor; and a switching determination unit which, if an actual measurement value of the number of rotations of the motor is greater than a prescribed threshold value of the number of rotations, switches the first control to the second control. The switching determination unit further switches the first control to the second control if the actual measurement value of the number of rotations is not more than the threshold value of the number of rotations, and when a prescribed time has passed from a point in time at which the actual measurement value of the number of rotations matched the required number of rotations.

Electric compressor, motor control method, and non-transitory computer-readable medium

A current value determination device provided with: a capacitor current computation unit for computing the capacitor current of a capacitor included in a high-voltage circuit that drives a motor, on the basis of the input voltage of an inverter included in the high-voltage circuit and the revolution speed of the motor; and a capacitor current determination unit for determining the value of capacitor current on the basis of the input voltage of the inverter, the revolution speed of the motor, the capacitor current computed by the capacitor current computation unit, and a prescribed model for determination.

Current value determination device, controller, electric compressor, current value determination method, and control method

To improve the accuracy of detecting a current flowing through an electric compressor after operation of the electric compressor, the electric compressor having a large change in temperature before and after operation. An inverter-integrated electric compressor () that compresses and discharges a refrigerant suctioned therein, includes an inverter device () provided with a circuit board () mounted with an inverter circuit (), the inverter device () being integrally incorporated in an inverter case. The circuit board () is provided with a current detection circuit () that detects an input current flowing through the inverter circuit (), and an offset correction circuit (). The current detection circuit () includes a shunt resistor () that is serially connected to the inverter circuit () and detects a current, and a first amplifier () that amplifies and outputs a voltage appearing as a voltage drop in the shunt resistor (). The offset correction circuit () includes a second amplifier () that performs an offset correction of the first amplifier (). The first amplifier () and the second amplifier () are integrated into a single integrated circuit.

Inverter-integrated electric compressor and circuit board, and method for manufacturing circuit board

In an inverter control apparatus, a phase current calculation section calculates each of phase currents flowing into a motor by using measurement results of a current sensor, and a voltage command generation section calculates three-phase voltage commands by using each of the estimated phase currents. A command modulation section compares the phase voltage commands with each other, to specify a full-on phase or a full-off phase on the basis of the comparison result and then to set the voltage command of the specified phase to a full-on voltage or a full-off voltage, and offsets the voltage commands of the other two phases according to the full-on voltage or the full-off voltage to modulate the voltage commands into voltage commands allowing the line voltage between the other two phases to be kept constant. A PWM signal generation section generates PWM signals by comparing, according to a predetermined rule set in advance, three carrier waves generated by a carrier wave generation section with each of the phase voltage commands modulated by the command modulation section. Accordingly, each of the phase currents can be calculated from a DC input current, so that the efficiency can be improved.

Inverter control apparatus and inverter apparatus

An object of the present invention is to achieve stable inverter control by means of current detection using one current sensor in all of periods in which overmodulation control is performed. An inverter controller includes a &#x3b3;-axis current calculation section that holds, in advance, a &#x3b3;-axis current arithmetic expression including a direct current as a parameter, and calculates a &#x3b3;-axis current using a direct current detected by a current sensor for the &#x3b3;-axis current arithmetic expression.

Inverter apparatus

To suppress a ripple contained in current flowing into a DC power supply during one-pulse control in a motor drive apparatus receiving electric power from the DC power supply. A motor drive apparatusincludes an inverter control device () provided with a one-pulse control mode in which, during one electrical angle cycle, a positive rectangular pulse voltage and a negative rectangular pulse voltage are applied, as gate drive signals, to a switching element corresponding to each phase. When performing the one-pulse control mode, the inverter control device () gradually increases or reduces a duty in a predetermined phase angle width at rising and falling edges of the rectangular wave voltage.

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Tokyo, Japan

Kyohei Watanabe