An electrically actuated booster performs displacement control such that the relative displacement relationship between an input member and an assist member is variable according to the absolute displacement of the input member. A target displacement that makes variable the relative displacement rel
An electrically actuated booster performs displacement control such that the relative displacement relationship between an input member and an assist member is variable according to the absolute displacement of the input member. A target displacement that makes variable the relative displacement relationship between an input piston and a booster piston is set according to a detection signal from a potentiometer (86), and displacement control is performed so that the relative displacement between the two pistons becomes equal to the target displacement on the basis of a signal from a relative displacement sensor (100) that detects the relative displacement between the two pistons.
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1. An electrically actuated booster comprising: a master cylinder that generates a brake fluid pressure;an input member that moves forward and backward in response to an operation of a brake pedal;a booster piston configured to control the brake fluid pressure in the master cylinder by moving in the
1. An electrically actuated booster comprising: a master cylinder that generates a brake fluid pressure;an input member that moves forward and backward in response to an operation of a brake pedal;a booster piston configured to control the brake fluid pressure in the master cylinder by moving in the master cylinder;an electrically-operated actuator that causes the booster piston to move;a target displacement setting unit that sets a target value of a relative displacement between the booster piston and the input member based on an operation amount of the brake pedal, or that sets a target value of an absolute displacement of the booster piston based on the operation amount of the brake pedal;a controller that controls the electrically-operated actuator so that the relative displacement between the booster piston and the input member becomes equal to the target value of the relative displacement set by the target displacement setting unit or the absolute displacement of the booster piston becomes the target value of the absolute displacement. 2. The electrically actuated booster of claim 1, wherein the target displacement setting unit sets the target value of the relative displacement or the target value of the absolute displacement to obtain various brake characteristics by changing the relative positional relationship between the input member and the booster piston. 3. The electrically actuated booster of claim 1, wherein the target displacement setting unit sets the target value of the relative displacement between the booster piston and the input member based on the operation amount of the brake pedal or sets the target value of the absolute displacement of the booster piston based on the operation amount of the brake pedal so that a forward movement of the booster piston becomes larger than a forward displacement of the input member in a direction for increasing the brake fluid pressure, and the relative displacement between the booster piston and the input member increases according to a forward movement of the booster piston. 4. The electrically actuated booster of claim 1, wherein the target displacement setting unit sets the target value of the relative displacement between the booster piston and the input member based on the operation amount of the brake pedal or sets the target value of the absolute displacement of the booster piston based on the operation amount of the brake pedal so that the booster piston moves backward relative to the forward movement of the input member in a direction for increasing the brake fluid pressure. 5. The electrically actuated booster of claim 1, further comprising a relative displacement detecting means that detects a relative displacement between the booster piston and the input member, wherein the controller that controls the electrically-operated actuator controls the electrically-operated actuator based on a signal from the relative displacement detecting means so that the relative displacement becomes the target value of the relative displacement set by the target displacement setting unit. 6. The electrically actuated booster of claim 1, further comprising a booster piston displacement detecting means that detects a displacement of the booster piston, wherein the controller that controls the electrically-operated actuator controls the electrically-operated actuator based on a signal from the booster piston displacement detecting means so that the absolute displacement becomes the target value of the absolute displacement set by the target displacement setting unit. 7. An electrically actuated booster comprising: a master cylinder that generates a brake fluid pressure;an input member that moves forward and backward in response to an operation of a brake pedal;a booster piston configured to control the brake fluid pressure in the master cylinder by moving in the master cylinder;an electrically-operated actuator that causes the booster piston to move;a target displacement setting unit that sets a target value of a relative displacement between the booster piston and the input member based on an operation amount of the brake pedal;a controller that controls the electrically-operated actuator so that the relative displacement between the booster piston and the input member becomes equal to the target value of the relative displacement set by the target displacement setting unit; anda memory that stores characteristic data relating to the relative displacement between the booster piston and the input member to a displacement of the brake pedal that is an operation amount of the brake pedal;wherein the target displacement setting unit sets the target value of the relative displacement based on the characteristic data stored in the memory. 8. The electrically actuated booster of claim 7, wherein the memory stores a plurality of types of characteristic data, as the characteristic data, for obtaining various brake characteristics by changing the relative displacement between the booster piston and the input member to the displacement of the brake pedal. 9. The electrically actuated booster of claim 7, wherein the target displacement setting unit sets the target value of the relative displacement between the booster piston and the input member based on the displacement of the brake pedal so that a forward movement of the booster piston becomes larger than a forward movement of the input member in a direction for increasing the brake fluid pressure, and the relative displacement between the booster piston and the input member increases according to a forward movement of the booster piston. 10. An electrically actuated booster comprising: a master cylinder that generates a brake fluid pressure;a booster piston configured to control the brake fluid pressure in the master cylinder by moving in the master cylinder;an electrically-operated actuator that causes the booster piston to move;a target displacement setting unit that sets a target value of an absolute displacement of the booster piston based on an operation amount of a brake pedal;a controller that controls the electrically-operated actuator so that the absolute displacement of the booster piston becomes the target value of the absolute displacement set by the target displacement setting unit; anda memory that stores a characteristic data relating to the absolute displacement of the booster piston to a displacement of the brake pedal that is the operation amount of the brake pedal;wherein the target displacement setting unit sets the target value of the absolute displacement based on the characteristic data stored in the memory. 11. The electrically actuated booster of claim 10, wherein the memory stores a plurality of types of characteristic data, as the characteristic data, for obtaining various brake characteristics by changing the absolute displacement of the booster piston to the displacement of the brake pedal. 12. The electrically actuated booster of claim 10, wherein the target displacement setting unit sets the target value of the absolute displacement of the booster piston based on the displacement of the brake pedal so that a forward movement of the booster piston becomes larger than a forward movement of the brake pedal in a direction for increasing the brake fluid pressure, and the absolute displacement of the booster piston to the absolute displacement of the brake pedal increases according to a forward movement of the booster piston. 13. An electrically actuated booster comprising: a housing;a master cylinder that is supported by the housing and generates a brake fluid pressure;a booster piston configured to move forward and backward along an axis of the master cylinder and to control the brake fluid pressure generated by the master cylinder;an electrically-operated actuator having an electric motor to cause the booster piston to move forward and backward;a controller that controls the electrically-operated actuator;a displacement measuring means detecting a braking operation amount by an operation of the brake pedal;an input member that moves forward and backward along an axis of the booster piston in response to a braking operation of a brake pedal; andurging means provided between the input member and the booster piston to urge the input member relative to the booster piston toward an initial position of the input member,wherein the master cylinder generates a brake fluid pressure based on a thrust force of the input member and a thrust force of the booster piston so that a part of a reaction force caused by the brake fluid pressure is transmitted to the input member, and another part of the reaction force is transmitted to the booster piston, respectively,wherein when the regenerative braking operation is performed by the regenerative braking system, the urging means compensate a reduction of the reaction force to the input member by the reduction of the brake fluid pressure in the master cylinder, based on the displacement of the booster piston,wherein the controller calculates a target position of the booster piston based on an output of displacement measuring means, and controls the electrically-operated actuator based on the target position, andwherein when a braking operation by a regenerative braking system is performed, the controller calculates a target position of the booster piston where the booster piston is displaced in a direction for reducing the brake fluid pressure, relative to a target position of the booster piston calculated when the braking operation by the regenerative braking system is not performed, and controls the electrically-operated actuator based on the calculated target position. 14. The electrically actuated booster of claim 13, wherein when a regenerative braking operation is performed, the controller controls the electrically-operated actuator by performing regenerative cooperative control so that the booster piston moves and the brake fluid pressure generated in the master cylinder is reduced by an amount corresponding to a regenerative braking force generated during regeneration. 15. The electrically actuated booster of claim 13, wherein the controller calculates a relative position of the booster piston to the input member as the target position, based on the output of the displacement measuring means, and controls the electrically-operated actuator based on the calculated target position. 16. The electrically actuated booster of claim 13, wherein the displacement detecting means generates an output representing an absolute displacement of the input member relative to the vehicle body, and wherein the controller calculates a target displacement of the booster piston based on the output of the displacement measuring means representing the absolute displacement of the input member.
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