The present invention relates to a piston valve assembly which is used in a continuous damping control damper using magneto-rheological fluid. The piston valve assembly is coupled with an end of the piston rod, and a stopper having a flat upper surface which is surface-contacted with an upper plate is disposed between a core assembly and the upper plate, thereby properly dispersing a force applied to the piston rod. According to the present invention, the reliability and stability in the coupling between the piston rod and the piston valve assembly can be increased, thereby stably controlling the damping force of the damper. Further, the slot is formed in the core of the piston valve assembly so as to reduce the damping force in the lower speed range, thereby considerably improving the driving comport of a vehicle.

The present invention relates to a sensor module comprising a relative displacement sensor and an acceleration sensor, and a damper equipped with the same. The damper comprises a cylinder which is formed with a hollow portion therein; a piston rod which is inserted through an upper portion of the cylinder; a piston valve which is connected with an end of the piston rod so as to reciprocate in the cylinder, and which is formed with a fluid passing hole formed to be passed through the piston valve up and down; a rod guide which air-tightly closes an upper end of the cylinder and has a though-hole in which the piston rod is inserted; and a sensor module which is provided with an acceleration sensor for detecting an acceleration at least in a z-axial direction and a displacement sensor for detecting a displacement of the piston rod and which is coupled with the rod guide.