Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Nippondenso Co., Ltd.

Osamu Ishida

Yoshiyuki Takeuchi

Hiroshi Maeda

Ryoma Taguchi

Isao Tsunoda

Noriyoshi Miyajima

Takahiro Ohmi

Yuichi Ueno

Masaki Sekiguchi

Takashi Kageyama

A vehicle air conditioner includes: a refrigerant circuit which includes a compressor, an external heat exchanger, an expansion valve, and an evaporator; and a cooling fan. The vehicle air conditioner further includes: a refrigerant temperature detection part; a vehicle environment temperature detection part; and a controller. The refrigerant temperature detection part is configured to determine the temperature of a refrigerant which flows into the expansion valve. The vehicle environment temperature detection part is configured to determine a temperature outside the refrigerant circuit under an installation environment. The controller is configured to control a speed of the cooling fan in a cooling operation time such that a cooling performance with respect to the external heat exchanger is decreased when the temperature difference between a determined refrigerant temperature by the refrigerant temperature detection part and a determined external temperature by the vehicle environment temperature detection part is equal to or less than a first set temperature difference.

Vehicle air conditioner

A motor-driven vehicle includes an electric motor, a power storage device, a control device, and a refrigerant circuit. The refrigerant circuit has a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger. The indoor heat exchanger exchanges heat with the refrigerant compressed by the compressor. The refrigerant which passes through the indoor heat exchanger is decompressed by the expansion valve, and the outdoor heat exchanger exchanges heat with the decompressed refrigerant and allows the refrigerant to return to the compressor. When the remaining capacity of the power storage device is equal to or more than a predetermined value, the control device operates the compressor and decreases a passing-through air volume of a first air guide device that controls a passing-through air volume of the outdoor heat exchanger.

Motor-driven vehicle

An electric vehicle includes an electric motor, a power storage device, a control device, and a refrigerant circuit. The refrigerant circuit includes a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a first expansion valve, a second expansion valve, and a second indoor heat exchanger. The control device repeats an operation of performing the other of a first operation and a second operation after performing one thereof when a remaining capacity of a power storage device is equal to or larger than a predetermined value. In the first operation, the first expansion valve is not decompressed and the second expansion valve is decompressed. In the second operation, the first expansion valve is decompressed and the second expansion valve is not decompressed.

Electric vehicle

A vehicle air conditioner includes a control device and a heating refrigerant circuit having: a compressor that compresses and discharges a suctioned refrigerant; an internal condenser that releases heat of the discharged refrigerant; an expansion valve that reduces a pressure of the refrigerant which passes through the internal condenser and that expands the refrigerant; and an external heat exchanger that exchanges heat between the refrigerant which passes through the expansion valve and external air and that causes the refrigerant after the heat exchange to return to the compressor. The opening degree of the expansion valve is controlled by the control device to be increased at a start of a heating operation to more than an ordinary opening degree during a heating operation to start the compressor, and after a set time elapses, to be caused to return to the ordinary opening degree during a heating operation.

Vehicle air conditioner with heating startup expansion valve control

An air-conditioner wherein the lubrication oil flowing through the refrigerant passage along with the refrigerant is reliably returned to the refrigerant compressor by having the refrigerant piping at the suction side of the compressor comprised of a first refrigerant piping and a second refrigerant piping connected in series with the same, the large diameter first refrigerant piping extending from a high position to a low position and the relatively small diameter second refrigerant piping extending in substantially the horizontal direction.

Growing community of inventors

Wako, Japan

Osamu Ishida