Kanto Seiki Co., Ltd.

Watasensor, Inc.

Kajiro Watanabe

Kunihiro Kaneko

Yasuo Saito

Katsushi Ohneda

Satoru Matsumori

Kazuyasu Kon

Shin-ichiro Tsurushima

Danh Le Ngoc

George Fuh Hwang

Katushi Ohneda

Embodiments of the present disclosure include an apparatus comprising an electronic device, a first magnet, and an inductive coil surrounding a magnetically susceptible core, wherein movement of the first magnet relative to the magnetically susceptible core changes a magnetic flux in the magnetically susceptible core to produce a current in the inductive coil, and in accordance therewith, provide power to the electronic device.

Magnetic power generation

A control circuit for an air-bag mounted in a motor vehicle comprises an acceleration sensor for producing an acceleration signal indicative of acceleration of the vehicle, an ignition timing circuit for processing the acceleration signal to predict the time when a passenger's head will reach a front surface of the air-bag in fully deployed condition and producing a first air-bag deploying signal in accordance with the predicted time, and a damage discrimination circuit for processing the acceleration signal and judging the need of activation of the air-bag when the cumulative effect of the acceleration exceeds a predetermined limit. The damage discrimination circuit produces a second air-bag deploying signal when judging the need of activation of the air-bag. A so-called AND circuit is further employed which actually activates the air-bag when receiving the first and second air-bag deploying signals concurrently.

Air-bag control circuit

A control circuit for an air-bag mounted in a motor vehicle comprises an acceleration sensor for producing an acceleration signal indicative of acceleration of the vehicle, an ignition timing circuit for processing the acceleration signal to predict the time when a passenger's head will reach a front surface of the air-bag in fully deployed condition and producing a first air-bag deploying signal in accordance with the predicted time, and a damage discrimination circuit for processing the acceleration signal and judging the need of activation of the air-bag when the cumulative effect of the acceleration exceeds a predetermined limit. The damage discrimination circuit produces a second air-bag deploying signal when judging the need of activation of the air-bag. A so-called AND means is further employed which actually activates the air-bag when receiving the first and second air-bag deploying signals concurrently.

The peak amplitude values of two different frequency pressure changes produced by the displacement device of a volume sensing arrangement, are obtained and one divided by the other to produce a value indicative of the volume of the unfilled portion of a storage vessel. The contents of the vessel are derived by subtracting the unfilled volume from the vessel capacity. In the embodiments wherein a single pressure sensor is used, the signal is simultaneously filtered with a low pass filter and a band pass filter in order to obtain static and dynamic pressure data. In some embodiments the single sensor is disposed in a chamber in which the displacement means produces two different frequency pressure variations. The chamber is communicated with the storage vessel by a pipe the length and diameter of which are selected to prevent the pressure variations produced by one of the frequencies from being transmitted therethrough. In other embodiments two pressure sensors are used and the special pipe dispensed with and the outputs of the two sensors fed individually to band pass filters.

Growing community of inventors

Tokyo, Japan

Kajiro Watanabe