Abstract: Disclosed are a tandem catalyst for synthesizing methyl acetate from carbon dioxide, a method for preparing the same, and a method for preparing methyl acetate using the same. The tandem catalyst of the present invention includes a first catalyst having a core-shell structure including a composite metal oxide core and a silica shell surrounding a surface of the composite metal oxide core, and a second catalyst including nano-ferrierite (N-FER) zeolite.

Abstract: A predictive traction control system may include: a road surface conditions information providing unit mounted on a vehicle driven by a driving motor, to detect and output an upstream road surface condition in a travelling direction of the vehicle; and a predictive control unit electrically connected to the road surface conditions information providing unit, determining an entry or release of the predictive traction control using information on road surface conditions input from the road surface conditions information providing unit, and calculating target driving motor speed for controlling the driving motor and transmitting the same.

Abstract: A brake system for a vehicle is provided to independently adjust a braking pressure of each wheel. The system includes a hydraulic pressure brake driven by two actuators and a sub-cylinder and valve configurations that are disposed in the peripheral flow path thereof to eliminate the pressure unbalance generated in the hydraulic pressure brake.

Abstract: A brake system for a vehicle is provided to independently adjust a braking pressure of each wheel. The system includes a hydraulic pressure brake driven by two actuators and a sub-cylinder and valve configurations that are disposed in the peripheral flow path thereof to eliminate the pressure unbalance generated in the hydraulic pressure brake.

Abstract: A brake system for a vehicle, may include a brake input device to apply a brake input of a driver; a brake actuator generating braking hydraulic pressure; wheel cylinders generating braking force for each vehicle wheel by the braking hydraulic pressure generated by the brake actuator; and a hydraulic pressure supply line connecting the brake actuator and the wheel cylinders, wherein the brake actuator includes a main pump device by which braking force is applied, and a sub control device configured for adjusting the braking force applied by the main pump device.

Abstract: An electromechanical brake may include a drive device for the electromechanical brake to which a non-circulation type ball screw is applied, and may automatically compensate for a position movement amount of a ball caused by pad abrasion, wherein the electromechanical brake includes a drive device, that is, an electromechanical brake with a non-circulation type ball screw, in which pad abrasion is compensated by the ball screw, a torsion spring, and a ball retainer mounted at the other side of the torsion spring.

Abstract: An electromechanical brake is configured to detect a change in motor characteristics through a parking mechanism added to an existing electromechanical brake. Particularly, the electromechanical brake controls braking force by predicting a change in motor characteristics even in the event of a breakdown of a force sensor or even in a case in which no force sensor is utilized.

Abstract: An electromechanical brake (EMB) may include a nut member coupled to the piston and transferring an axial moving force to the piston; a screw coupled to the nut member and rotated to move the nut member in an axial direction; balls inserted between the nut member and the screw and transferring a rotational force of the screw to the nut member; a compression coil spring having one side mounted on the nut member; and a ball retainer mounted at the other side of the compression coil spring, wherein the ball retainer is disposed to be adjacent to a ball at a rearmost end portion among the balls inserted between the nut member and the screw, and pressurizes the compression coil spring while coming in contact with the balls during braking pressurization.

Abstract: A brake system for a vehicle may include a brake input device configured to apply a brake input of a driver; a brake actuator including a first pump device and a second pump device for supplying a brake hydraulic pressure; a brake adjusting device, which includes a first chamber and a second chamber, and is operated so that the first chamber and the second chamber are connected to or blocked from each other; and wheel cylinders configured to generate brake power for each wheel by the brake hydraulic pressure generated in the brake actuator, wherein the brake adjusting device blocks the first chamber and the second chamber so that a brake hydraulic pressure supplied from the first pump device and a brake hydraulic pressure supplied from the second pump device are blocked from each other.

Abstract: An electromechanical brake is capable of quickly releasing braking force and improving braking performance of a vehicle even when a power source breaks down. The electromechanical brake includes a drive unit including: a nut member which is coupled to a piston and moves in an axial direction to allow the piston to move forward and backward; a spindle which is thread-coupled to the nut member and rotates to move the nut member in the axial direction; an electric motor which provides power for rotating the spindle; a friction member which rotates together with the spindle; and an elastic member which stores elastic energy by being deformed when the friction member rotates during the braking operation, and provides elastic restoring force as backward torque to the spindle through the friction member when the braking operation is released.

Abstract: An electromechanical brake device and a method of controlling the same provide the electromechanical brake device capable of estimating motor characteristics, and the method capable of controlling the electromechanical brake device by estimating motor characteristics. The electromechanical brake device includes a reaction force generating mechanism which is installed between a piston and one side of a caliper housing, generates reaction force applied against straight moving force of the piston, which moves backward in an axial direction, in a direction in which a braking operation is released, and applies reaction force to the piston; a sensor which detects a motor operating state; and a controller which estimates a motor torque constant that represents a correlation between motor electric current and motor rotational torque, based on motor operating state information detected by the sensor when an operation of the motor is controlled.

Abstract: An electromechanical brake includes a piston installed in a caliper housing so as to be movable forward and backward in an axial direction, and moves forward in the axial direction at the time of performing a braking operation so as to press a friction pad provided to clamp a disc; an actuator which provides rotational force for moving the piston; a spindle which is thread-coupled to the piston, and rotates by rotational force transmitted from the actuator to move the piston forward and backward in the axial direction; and a guide member which is provided to be integrally fixed to the caliper housing and coupled to the piston so as to restrict rotation of the piston and guide forward and backward axial movement of the piston, in which the guide member has a support portion which is coupled to the spindle and supports the spindle in the axial direction.

Abstract: A brake system for a vehicle may include a brake input device configured to apply a brake input of a driver; a brake actuator including a first pump device and a second pump device for supplying a brake hydraulic pressure; a brake adjusting device, which includes a first chamber and a second chamber, and is operated so that the first chamber and the second chamber are connected to or blocked from each other; and wheel cylinders configured to generate brake power for each wheel by the brake hydraulic pressure generated in the brake actuator, wherein the brake adjusting device blocks the first chamber and the second chamber so that a brake hydraulic pressure supplied from the first pump device and a brake hydraulic pressure supplied from the second pump device are blocked from each other.

Abstract: A brake system for a vehicle, may include a brake input device to apply a brake input of a driver; a brake actuator generating braking hydraulic pressure; wheel cylinders generating braking force for each vehicle wheel by the braking hydraulic pressure generated by the brake actuator; and a hydraulic pressure supply line connecting the brake actuator and the wheel cylinders, wherein the brake actuator includes a main pump device by which braking force is applied, and a sub control device configured for adjusting the braking force applied by the main pump device.

Abstract: An electromechanical brake (EMB) may include a nut member coupled to the piston and transferring an axial moving force to the piston; a screw coupled to the nut member and rotated to move the nut member in an axial direction; balls inserted between the nut member and the screw and transferring a rotational force of the screw to the nut member; a compression coil spring having one side mounted on the nut member; and a ball retainer mounted at the other side of the compression coil spring, wherein the ball retainer is disposed to be adjacent to a ball at a rearmost end portion among the balls inserted between the nut member and the screw, and pressurizes the compression coil spring while coming in contact with the balls during braking pressurization.

Abstract: An electromechanical brake may include a drive device for the electromechanical brake to which a non-circulation type ball screw is applied, and may automatically compensate for a position movement amount of a ball caused by pad abrasion, wherein the electromechanical brake includes a drive device, that is, an electromechanical brake with a non-circulation type ball screw, in which pad abrasion is compensated by the ball screw, a torsion spring, and a ball retainer mounted at the other side of the torsion spring.

Abstract: An electromechanical brake integrates a function of a parking brake by adding a simple structure to an existing electromechanical brake. In particular, the electromechanical brake includes a parking braking releasing structure configured to automatically release parking braking after a parking brake operates. In addition, the electromechanical brake is implemented to perform and release parking braking by using a drive unit which may operate in a single direction instead of using a drive unit which may operate in two directions.

Abstract: An electromechanical brake integrates a function of a parking brake by adding a simple structure to an existing electromechanical brake. In particular, the electromechanical brake includes a parking braking releasing structure configured to automatically release parking braking after a parking brake operates. In addition, the electromechanical brake is implemented to perform and release parking braking by using a drive unit which may operate in a single direction instead of using a drive unit which may operate in two directions.

Abstract: An electromechanical brake is configured to detect a change in motor characteristics through a parking mechanism added to an existing electromechanical brake. Particularly, the electromechanical brake controls braking force by predicting a change in motor characteristics even in the event of a breakdown of a force sensor or even in a case in which no force sensor is utilized.

Abstract: An electromechanical brake includes a piston installed in a caliper housing so as to be movable forward and backward in an axial direction, and moves forward in the axial direction at the time of performing a braking operation so as to press a friction pad provided to clamp a disc; an actuator which provides rotational force for moving the piston; a spindle which is thread-coupled to the piston, and rotates by rotational force transmitted from the actuator to move the piston forward and backward in the axial direction; and a guide member which is provided to be integrally fixed to the caliper housing and coupled to the piston so as to restrict rotation of the piston and guide forward and backward axial movement of the piston, in which the guide member has a support portion which is coupled to the spindle and supports the spindle in the axial direction.