Denso Corporation

Hisashi Ieda

Mitsuyo Oomura

Ken Matsunaga

Yuji Takeo

Toshinobu Homan

Kunio Iritani

Masaya Tanaka

Keita Honda

An air-conditioner is operated under one mode selected from among three modes, i.e., a cooling mode, a heating mode and an air-mixing mode. Conditioned air temperature is controlled by changing a cooling ability in the cooling mode, a heating ability in the heating mode, and a position of an air-mixing door in the air-mixing mode. When the operating mode is switched to the cooling mode or to the heating mode from another mode, the position of the air-mixing door is gradually changed to prevent an abrupt temperature drop or rise until a difference between a target temperature and an actual temperature becomes smaller than a predetermined value.

Automotive air-conditioner operable under cooling, heating or air-mixing mode

A power supply control for a vehicle includes air-conditioning electric devices and other electric devices. In the power supply control operation, current target power that is necessary for the specific electric device is calculated based on a precedent target power that was calculated the last time the specific electric device was used. An allowed power that is allowed to be supplied to the specific electric device is calculated based on the total power demand of the vehicle. The power to be supplied to the specific device is limited to the allowed power if the current target power is larger than the allowed power and the precedent target power is replaced with the allowed power if the actual power supplied to the specific electric device is limited to the allowed power.

Vehicle power supply control 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

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

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.

Growing community of inventors

Nagoya, Japan

Hisashi Ieda