Nippondenso Co., Ltd.

Denso Corporation

Satoru Kodama

Akira Isaji

Masahiko Ito

Yuji Takeo

Eiji Takahashi

Yasukazu Kitamine

Teiyuu Kimura

Tomohisa Yoshimi

Satoshi Takeuchi

Masaya Tanaka

Yasuo Kondo

Shinji Nanba

Rie Ohsaki

Tsukasa Koumura

Seiichi Yamada

Masao Hasegawa

Shinichi Mashimo

Takeshi Yoshinori

A vital signal detecting apparatus comprises an attachable device to be attached to a finger, a sensor having a light-emitting device and a light-receiving device, and a transmitting circuit for transmitting a signal waveform as a pulse wave from the sensor to a pulse wave monitoring unit. The pulse wave detecting unit also has an attachment detecting circuit for detecting whether or not the attachable device is in an attached state by comparing a signal waveform obtained when the light-emitting device is on with a signal waveform obtained when the light-emitting device is off and an operation control circuit for controlling the operation of the sensor, the transmitting circuit and the attachment detecting circuit. Preferably, the light-transmitting plate is disposed above the light-emitting device and the light-receiving device to pass light therethrough, and the light transmitting plate may be an IR-cut filter capable of blocking light of wavelengths greater than 700 nm.

Vital signal detecting apparatus

A control device controls operation of a brushless DC motor in such a way that the motor is started and accelerated up to a predetermined rotational speed by applying driving voltage formulated based on a synchronous signal under a startup-drive-mode and the driving mode is switched, after the predetermined rotational speed is established, to a self-controlled-drive-mode in which the driving voltage is formulated based on signals indicating an angular position of the rotor relative to the armature. In the transient period for switching-over from the start-up-drive to the self-controlled-drive, phase difference between the driving voltage and the rotor position signal is detected for a period covering more than one rotation of the rotor, the switching-over is carried out only when the phase difference is sufficiently small to avoid a motor stall or an excessive shock. Preferably, a pulse-width-modulated voltage is used as the driving voltage, so that the phase difference can be controlled by changing a duty ratio of the driving voltage.

Control device for brushless DC motor

In a driving system for vehicles having a high voltage main battery for a vehicle drive motor and a low voltage accessory battery for accessory devices such as a radio receiver, a three-phase inverter circuit for driving the vehicle drive motor and a DC-DC converter are connected to the main battery through electromagnetically shielded high voltage power lines. The DC-DC converter supplies a low voltage electric power to a driver circuit for switching on and off the inverter circuit. Switching noise voltages caused by switching operations in the inverter circuit, the driver circuit and the DC-DC converter are restricted from being superimposed on low voltage power lines connecting the accessory battery to the accessory devices.

Driving system for electric vehicles having a plurality of batteries

To prevent a thermal medium from assuming a superheated state and to stably supply hot air for warming in an apparatus which performs warming by a combustion heater. A hot-water recirculation path connecting a hot-water heater core, water pump, cooler for a motor for running use and an inverter device, first switching valve, and combustion heater in a closed loop is provided. A temperature sensor is disposed at an intermediate location in the hot-water recirculation path. A heat-radiating passage having a second switching valve and radiator is connected to the hot-water recirculation path. During heating operation, an ECU closes the second switching valve and switches off a radiator fan when a detected temperature of the first temperature sensor is less than a set temperature for radiating heat, and opens the second switching valve and switches off the radiator fan when the detected temperature of the first temperature sensor is the set temperature for radiating heat or more.

Automotive air-conditioning apparatus with combustion heater

An automotive air conditioning system is provided to be able to minutely control the air blow temperature independently of the ambient temperature to maintain the compartment always pleasant. The difference between the revolution speed of a compressor with a temperature setting lever for setting the revolution speed of the compressor set in the left end position and the revolution speed of the compressor with the temperature setting lever set in the left end position is increased in the mid summer or mid winter and reduced in the spring or autumn, whereby the air blow temperature can be minutely controlled to make the inside of the compartment always pleasant.

Automotive air conditioning system

An air conditioning apparatus includes an air duct having an inlet and an outlet supplying conditioned air, and an air conditioner for cooling and heating air using a refrigeration cycle. In the refrigeration cycle, the air conditioner includes a first heat exchanger, a second heat exchanger disposed on a downstream side of the first heat exchanger, and a compressor. The air conditioner selectively operates in a cooling mode where cool air cooled by the first heat exchanger is supplied through the outlet of the air duct, in a heating mode where hot air heated by the first heat exchanger is supplied through the outlet of the air duct, and in a dehumidifying mode where air cooled by the first heat exchanger and subsequently heated by the second heat exchanger is supplied through the outlet of the air duct. In order to prevent frosting of the heat exchanger functioning as an evaporator, a temperature sensor just downstream of the first heat exchanger in conjunction with a timer and control arrangement increase the evaporator temperature if it is below a set lower limit for a set period of time.

Air conditioning apparatus for vehicle

An arousal level judging apparatus has a skin potential level (SPL) detection device, a potential change detection device for detecting occurrance and convergence of a pulse of the signal from the SPL detection device, the pulse being caused by skin potential response (SPR), a storing device for storing the SPL value as a reference value, and a comparator for comparing SPL with the reference value to detect a SPL decrease to detect an arousal level decrease of a driver, etc. The reference value is renewed at every occurrance of SPR. When the SPL value indicates that the arousal level of the driver has been decreased, an alarm is caused to wake the driver up.

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Obu, Japan

Satoru Kodama