Abstract: The main component of a valve body is a ternary fluororubber of a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer, the JIS K 6253 hardness of the valve body is 50-90, the tensile strength of the valve body is 10-35 MPa, and the elongation at break of the valve body is 100-500%. Relative to the inside diameter of a gas discharge channel provided to an inner-side area of the valve seat, the distance by which a movable core is moved by an electromagnetic coil is within a range of 0.1 times to 0.3 times, the diameter of the valve body is within a range of 1.5 times to 3.0 times, the thickness of the valve body is 0.3 times or greater, the protruding height of the valve seat is 0.3 times or greater, and the inside diameter of an annular gas accumulating space is 2.0 times to 5.0 times.

Abstract: A four-wheel-drive vehicle including a powertrain operable to adjust a front- and rear-wheel driving force ratio that is a ratio between a driving force of front wheels and a driving force of rear wheels includes a control device that controls the powertrain and adjusts the front- and rear-wheel driving force ratio so as to reduce the driving force of the front wheels that are steered wheels, when it is detected that emergency avoidance to avoid collision with an avoidance target ahead in a traveling direction is necessary.

Abstract: A four-wheel-drive vehicle including a powertrain operable to adjust a front- and rear-wheel driving force ratio that is a ratio between a driving force of front wheels and a driving force of rear wheels includes a control device that controls the powertrain and adjusts the front- and rear-wheel driving force ratio so as to reduce the driving force of the front wheels that are steered wheels, when it is detected that emergency avoidance to avoid collision with an avoidance target ahead in a traveling direction is necessary.

Abstract: The main component of a valve body is a ternary fluororubber of a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer, the JIS K 6253 hardness of the valve body is 50-90, the tensile strength of the valve body is 10-35 MPa, and the elongation at break of the valve body is 100-500%. Relative to the inside diameter of a gas discharge channel provided to an inner-side area of the valve seat, the distance by which a movable core is moved by an electromagnetic coil is within a range of 0.1 times to 0.3 times, the diameter of the valve body is within a range of 1.5 times to 3.0 times, the thickness of the valve body is 0.3 times or greater, the protruding height of the valve seat is 0.3 times or greater, and the inside diameter of an annular gas accumulating space is 2.0 times to 5.0 times.