Jtekt Corporation

Toyoda Koki Kabushiki Kaisha

Kazushi Suzuki

Tomonari Yamakawa

Atsuo Sakai

Tsutomu Matsumoto

Kazuya Sakai

Tetsushi Kawamura

Isamu Kandori

A motor control device with which both high-accuracy current detection and improvement in voltage utilization factor are achieved is provided. When an ON time of any one of low potential side switching elements corresponding to respective phases in a driving circuit is shorter than a detection time of a current value, a microcomputer estimates a phase current value of a current undetectable phase based on current values of two phases other than the current undetectable phase corresponding to the said FET. Then, at the time of current detection using the blind correction, during current detection for two phases, other than the current undetectable phase, based on which the blind correction is performed, motor control signals for maintaining switching states of a switching arm corresponding to the current undetectable phase are output.

Motor control device and electric power steering system

A pressure sensor is composed of a pressure housing having a pressure chamber inside and a pressure sensitive element arranged in the pressure chamber, and a joint housing having a fluid passage for leading fluid into the pressure housing, wherein the pressure housing and the joint housing are jointed by brazing with an insulating member interposed at a joint section therebetween. A stress relieving member is interposed at least either between the metal housing and the insulating member or between the joint housing and the insulating member, so that the insulating member can be relieved of a stress which is caused by the braze jointing to act on the insulating member.

Pressure sensor and manufacturing method therefor

In a pressure sensor which has a metal housingcontaining a sensor chipand a joint housingand in which an insulating memberis arranged to electrically insulate both of the metal housingand the joint housingfrom each other, the metal housingis connected to a stable potential such as, for example, a sensor power supply or a sensor ground. Thus, there can be solved a problem that the detection signal is liable to be influenced by electric noise from outside where a signal line of the pressure sensor and the sensor housing are electrically suspended or unfixed.

Pressure sensor

A pressure sensor is provided with a semiconductor device that is capable of detecting a pressure, a terminal that is connected to the semiconductor device by a bonding wire, a housing having an accommodation space for the semiconductor device, the bonding wire, and the terminal, a diaphragm for sealing the accommodation space, and working fluid that is sealed in the accommodation space and transmits a pressure applied to the diaphragm to the semiconductor device. The working fluid is silicone-based oil, and the terminal and the housing are sealed by fluorine-based adhesive.

Growing community of inventors

Chiryu, Japan

Kazushi Suzuki