Calsonic Corporation

Nihon Radiator Co., Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Masahiro Honma

Naoya Watanabe

Koji Iwahashi

Tadashi Nagai

Fumio Hagi

Takenosuke Sano

Yukihiro Niide

Masashi Sawada

Fumio Makiyama

Takashi Katou

An alcohol concentration detecting device is disclosed, which comprises an alcohol sensor of capacitance type having a probe portion which is to be submerged in an alcohol-mixed fuel, the alcohol sensor issuing an output signal which varies in accordance with the concentration of alcohol in the alcohol-mixed fuel; a first oscillating circuit which receives the output signal of the alcohol sensor and issues a variable pulse signal whose duty ratio is variable in accordance with the output signal; a second oscillating circuit which issues a reference pulse signal, the reference pulse signal being the same as the pulse signal which is provided by the first oscillating circuit when there is no alcohol in the fuel; and an alcohol concentration detecting circuit which receives and compares the variable pulse signal and the reference pulse signal and issues an alcohol concentration representing signal which is variable in accordance with a difference in duty ratio between the variable pulse signal and the reference pulse signal.

Alcohol concentration detecting device

An instrument for detecting the condition of an oil is provided in which an ultrasonic wave having a predetermined waveform is propagated through the oil and assumes a change in waveform in accordance with the particular condition of the oil. The instrument includes an arrangement in which any change in the waveform of the propagated ultrasonic wave is translated into a change in terms of time involving the waveform, which is used for the detection of the particular condition of the oil.

Oil condition detecting apparatus

Growing community of inventors

Tokyo, Japan

Masahiro Honma