Denso Corporation

Other

Nippondenso Co., Ltd.

Ken Matsunaga

Hisashi Ieda

Yuji Takeo

Mitsuyo Oomura

Toshinobu Homan

Kunio Iritani

Takashi Yamanaka

Yoshitaka Tomatsu

Yoshiyuki Yamauchi

Motohiro Yamaguchi

Takeshi Wakisaka

Yuichi Sakajo

Masaya Tanaka

Keita Honda

Susumu Kazama

Masatoshi Sudo

Naoto Hotta

Minoru Sasaki

Kiyomitsu Tsuchiya

Kenichi Hasegawa

Yasuaki Sasaki

Yoshihiko Adachi

Kyohsuke Hattori

Masami Ohshita

A refrigerant cycle device for a vehicle includes a compressor which compresses and discharges refrigerant, a discharge capacity control portion which controls a discharge capacity of the compressor. The refrigerant cycle device further includes a noise determination portion which determines whether an audible noise other than a refrigerant passing noise is in a low noise state, and/or a load determination portion which determines whether an air-conditioning thermal load is in a high load state. The discharge capacity control portion performs a gradual activation control in which the discharge capacity of the compressor is set to be lower than that determined in a normal control, when the noise determination portion determines that the audible noise is in the low noise state, and/or when the load determination portion determines that the air-conditioning thermal load is in the high load state, at an activation time of the compressor.

Refrigerant cycle device

A refrigeration cycle controls a second evaporator while a first evaporator is operating. The refrigeration cycle of the present invention makes a differential pressure between an inlet refrigerant pressure and an outlet refrigerant pressure of a second evaporator solenoid valve when starting or stopping the second evaporator during operation of the first evaporator smaller than the differential pressure when operating only the first evaporator, then opening or closing the second evaporator solenoid valve.

Refrigeration cycle

A fuel cell system has a fuel cell, an air-refrigerant heat exchanger, and primary and secondary expansion valves. The air-refrigerant heat exchanger performs heat exchange between exhaust air discharged from the fuel cell and a refrigerant in a refrigeration cycle. The primary expansion valve reduces the pressure of the refrigerant at an upstream side of the air-refrigerant heat exchanger. The secondary expansion valve reduces the pressure of the refrigerant at a downstream side of the air-refrigerant heat exchanger. While the air-refrigerant heat exchanger performs the heat-exchange from the air to the refrigerant, the primary expansion valve controls a reduced magnitude of the pressure of the refrigerant so that a temperature of the refrigerant is set to a specified value within a range of 0&#xb0; C. to 5&#xb0; C., preferably set to 0&#xb0; C., at which water component contained in the air does not freeze.

Fuel cell system

An electric heater apparatus for automobiles is disclosed. A sheathed heater () constituting a heat generating member of a heater assembly () generates heat by power supplied from a main power supply for generating a DC high voltage through an inverter. A thermal fuse () has a temperature detecting element () (low-melting alloy) adapted to fuse when a set temperature is reached. The temperature detecting element () is connected to the power circuit of the sheathed heater () through lead wires (). The thermal fuse () is arranged in such a position that the longitudinal direction of the temperature detecting element () accommodated in the casing () is coincident with the longitudinal direction of the heater assembly, and mounted in surface-to-surface contact with the body (aluminum body ()) of the heater assembly (). Also, the interior of the casing () is sealed with a material (such as cement or a silicon caulking material) higher in heat conductivity than air.

Automotive electric heater apparatus

In a fluid heating apparatus, a heat protect temperature sensor indirectly detects temperature of fluid heated by an electric heater adjacent to the electric heater. Also, a heated fluid sensor detects the temperature of the fluid adjacent to a fluid inlet of a heat exchanger. When it is determined that the temperature difference between the detected temperatures exceeds a predetermined level, electric power supply to the electric heater is discontinued. Thus, boil-dry is restricted early with a simple means.

Fluid heating apparatus

A hot water heating apparatus for an electric vehicle and a hybrid vehicle has a compact heat source apparatus not requiring a wide space for setting. A communication pipe, in which water as a heat medium flows, and an electric heater are embedded in a heat conductor metal in proximity in a row arrangement to form a flat-shaped heat conductor. A heat source apparatus is constructed by stacking multiple flat-shaped heat conductors while the communication pipes are connected to each other in series. Further, the communication pipe and the electric heater are embedded in the heat conductor metal in proximity in a row arrangement, and the communication pipes are connected in series. Therefore, water flowing in the communication pipes is rapidly heated, and heating efficiency is extremely high.

Hot-water heating apparatus for electric vehicle and hybrid vehicle

In a vehicle air-conditioning system, a supply of electric power to a first electric heater and a supply of electric power to a second electric heater are duty controlled at the same duty ratio in such a manner that the supply of the electric power to the second electric heater is phase shifted by one half of a period from the supply of the electric power to the first electric heater.

Electric load control system and vehicle air-conditioning system having the same

In an electrical load controller, a thermal fuse is blown at an abnormal heating of an electrical load, so that an electrical circuit of the electrical load is disconnected. The controller controls a work amount of the electrical load by intermittently controlling electrical power to be supplied thereto. The power supply to the electrical load is intermittently stopped even when the work amount of the electrical load is controlled at a maximum amount. Therefore, an arc, generated when the thermal fuse is blown, disappears while the power supply is stopped, so that the thermal fuse can be accurately operated.

Electrical load controller and vehicle air conditioner using the same

An air-conditioner for use in an electric vehicle or a hybrid vehicle includes an electric heater for heating water circulating through a heater core and a compressor for compressing refrigerant in a refrigeration cycle. The electric heater is powered by an on-board battery, and the compressor is also driven by the same on-board battery. When a voltage of the on-board battery abnormally increases to a first predetermined level, the electric heater is switched off to prevent the electric heater from being overheated. When the voltage further increases to a second predetermined level, operation of the compressor is also terminated. Thus, the electric heater is properly protected from the abnormally high voltage while properly keeping performance of the air-conditioner.

Automotive air-conditioner having electric heater and electrically driven compressor

A vehicle air-conditioning system limits electric power used by an electric motor for a compressor in a prescribed fashion that quickly removes fog from the windows when a defroster mode is selected. When the defroster mode is selected, the limit on the electric power used by the electric motor is lifted, and the number of revolutions of the compressor is set to a high level to raise the dehumidifying and cooling capability to quickly remove moisture from the windows.

Vehicle air-conditioning system

In an air conditioner for a hybrid vehicle, when a residual charging degree of a battery becomes equal to or lower than a target degree, the electrical motor generator is driven by a vehicle engine so that the battery is charged through the electrical motor generator. When the engine is driven, the target degree of the battery is set higher than that when the engine is stopped so that a charging operation tends to be required while the engines driven. Accordingly, the frequency for starting the engine only for charging the battery is reduced.

Air conditioner for hybrid vehicle

In a vehicle air conditioner where air blown into a passenger compartment is heated in a heater core using cooling water for cooling a fuel cell system as a heating source, a flow amount of cooling water flowing into the heat core is controlled by a control valve based on a surplus heat quantity of the fuel cell system and a necessary heat quantity of the passenger compartment. Further, when the surplus heat quantity of the fuel cell system is smaller than the necessary heat quantity, an insufficient heat quantity is supplemented by a supplementary heater.

Vehicle air conditioner with heating capacity control of cooling water circuit

A plate type heat exchanger has a plurality of tube units and a plurality of corrugated fins. Each of the tube units is formed by a pair of plates, namely a pair of plates are connected to each other by a brazing material at a connecting portion at an outer periphery of the plate and a center rib at a center axis of the plate. The center rib has an enlarged portion at the top end thereof in order to gather the molten brazing material toward the enlarged portion. The brazing at the center rib is started from the enlarged portion. Therefore a brazing defect is prevented from occurring at the top end of the center rib. Since the tube unit is effectively connected by brazing, the tube unit of the present invention has enough anti-pressure strength.

Growing community of inventors

Kariya, Japan

Ken Matsunaga