Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Limited

Tomoyasu Osaki

Hidetaka Sato

Keiji Nagasaka

Ryota Kojima

Manabu Suzuki

Ichiro Yogo

This vehicle-mounted air conditioner control device () comprises: a PTC heater (H) that is included in a high-voltage system circuit (HV) and generates heat by the power supplied from a high-voltage battery (B); and a microcomputer () that is included in the high-voltage system circuit (HV) and controls the power supply from the high-voltage battery (B) to the PTC heater (H). This vehicle-mounted air conditioner control device () further comprises: a water temperature sensor () that is included in a low-voltage system circuit (LV) and outputs a voltage signal corresponding to the temperature of hot water; and a V/f conversion unit () that is included in the low-voltage system circuit (LV) and converts the voltage signal output from the water temperature sensor () into a frequency signal. This vehicle-mounted air conditioner control device () further comprises a digital isolator () that transmits the frequency signal to the microcomputer () while maintaining electrical insulation between the V/f conversion unit () and the microcomputer ().

Vehicle-mounted air conditioner control device, and vehicle

This on-board air conditioner control device comprises: a PTC heater which is contained in a high-voltage circuit and generates heat by means of power supplied from a high-voltage battery; a micro-controller which is contained in a low-voltage circuit and controls the power supplied to the PTC heater from the high-voltage battery; a current detection sensor which is contained in the high-voltage circuit and outputs a voltage signal indicating a value for the current flowing through the PTC heater; a V/f conversion unit which is contained in the high-voltage circuit and converts the voltage signal outputted by the current detection sensor to a frequency signal; and a digital isolator which transmits the frequency signal to the micro-controller while preserving electrical insulation between the V/f conversion unit and the micro-controller.

On-board air conditioner control device, and vehicle

The on-state malfunction detection device detects an on-state malfunction, for instance, in an IGBT that is provided to correspond to a PTC element whose electrical resistance value varies according to temperature and that controls the electrification of the PTC element. In a state in which a turn-off instruction has been outputted from a control device to the IGBT, the on-state malfunction detection device determines through calculation an electric potential difference following voltage division of the voltage between the both ends of the PTC element, and detects an on-state malfunction of the IGBT when this electric potential difference is equal to or greater than a predetermined threshold value. This allows for the detection of an on-state malfunction in a switching element that performs an electrical conduction control for an element whose electrical resistance value varies according to temperature.

On-state malfunction detection device and method therefor

An integrated-inverter electric compressor in which an inverter accommodating section () is provided on the periphery of a housing, an inverter that supplies driving power to an electric motor is installed in the inverter accommodating section (), and its opening () is tightly sealed with a cover () is configured such that a groove () in which a liquid sealant () is to be filled is provided in a flange () around the opening (); the liquid sealant () filled in the groove () is cured to tightly seal a joint surface between the flange () and the cover (); and when the width of a joint surface () formed at the inner periphery of the groove () in the flange () is Land the width of a joint surface () formed at the outer periphery of the groove () is L, L&#x3c;Lholds.

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Tokyo, Japan

Tomoyasu Osaki