Abstract: An electronic device accommodating housing is attached to an attachment member by fastening members, and includes a case main body and a case cover. An electronic device is mounted on the case main body. The case cover is engaged with the case main body to cover the electronic device. One of the case main body and the case cover includes a reference hole and a release hole to be fixed to the attachment member. One of the fastening members fastened to the attachment member passes through the reference hole. An entire circumference of the reference hole is closed. The rest of the fastening members passes through the release hole. A region of the release hole on its circumference is opened so that the rest of the fastening members passing through the release hole is capable of being fallen out of the release hole.

Abstract: An electronic device accommodating housing is attached to an attachment member by fastening members, and includes a case main body and a case cover. An electronic device is mounted on the case main body. The case cover is engaged with the case main body to cover the electronic device. One of the case main body and the case cover includes a reference hole and a release hole to be fixed to the attachment member. One of the fastening members fastened to the attachment member passes through the reference hole. An entire circumference of the reference hole is closed. The rest of the fastening members passes through the release hole. A region of the release hole on its circumference is opened so that the rest of the fastening members passing through the release hole is capable of being fallen out of the release hole.

Abstract: A communication system for performing serial communication using a first level, a second level and a middle level includes a first device; a second device; and a signal line, wherein the serial communication is performed by a first communication format signal sent together with a clock from the first device to the second device under a first mode, and a second communication format signal sent from the second device to the first device under a second mode, wherein the first communication format signal includes a first start bit, a plurality of first data bits, a plurality of first inverted data bits, a first check bit generated from the first data bits and a first inversion check bit, and the second communication format signal includes a second start bit, a plurality of second data bits, and a second check bit generated from the second data bits.

Abstract: A communication system for performing serial communication using a first level, a second level and a middle level includes a first device; a second device; and a signal line, wherein the serial communication is performed by a first communication format signal sent together with a clock from the first device to the second device under a first mode, and a second communication format signal sent from the second device to the first device under a second mode, wherein the first communication format signal includes a first start bit, a plurality of first data bits, a plurality of first inverted data bits, a first check bit generated from the first data bits and a first inversion check bit, and the second communication format signal includes a second start bit, a plurality of second data bits, and a second check bit generated from the second data bits.

Abstract: A communication system including a first device and a second device that are connected by a single signal line in which serial communication is performed by using a first level, a second level and a middle level between the first level and the second level, wherein the first device transmits a clock to the second device by repeating the first level and the middle level; the second device transmits information to the first device based on whether the second device outputs the second level during each period of the middle level in the clock; and when the second device does not transmit information, the first device transmits information to the second device based on whether the first device outputs the second level during each period of the middle level in the clock.

Abstract: A box-shaped housing of an in-vehicle electronic control unit that controls an occupant crash protection system is installed to an installation surface of a vehicle and includes an opening end that defines an opening in an imaginary plane, a ceiling wall, and a peripheral wall. The housing receives a planar control circuit board of the control unit through the opening end toward the ceiling wall and securely holds the circuit board at the peripheral wall such that a plane of the circuit board is parallel to the imaginary plane. The peripheral wall includes an opening side wall section located adjacent to the opening end, and a ceiling side wall section having a thickness larger than a thickness of the opening side wall section.

Abstract: A box-shaped housing of an in-vehicle electronic control unit that controls an occupant crash protection system is installed to an installation surface of a vehicle and includes an opening end that defines an opening in an imaginary plane, a ceiling wall, and a peripheral wall. The housing receives a planar control circuit board of the control unit through the opening end toward the ceiling wall and securely holds the circuit board at the peripheral wall such that a plane of the circuit board is parallel to the imaginary plane. The peripheral wall includes an opening side wall section located adjacent to the opening end, and a ceiling side wall section having a thickness larger than a thickness of the opening side wall section.

Abstract: In a passenger protecting device for a vehicle, an airbag is held in a steering wheel coaxially supported by a steering column which can be shifted in a central axis direction thereof by a telescopic unit. A steering sensor, a seat sensor and multiple driver sensors are provided to respectively detect positions of the steering wheel, a driver seat and a driver. An airbag control unit calculates a distance between the steering wheel and the driver based on the positions, and thus the airbag is deployed corresponding to the distance. Accordingly, a secondary impact to the driver due to the airbag can be effectively restricted.