308 results about "Brake-by-wire" patented technology

The invention relates to the technical field of brake-by-wire, and provides a self-adaptive fluid infusion control method, device and equipment for a brake-by-wire system. The method comprises the steps that when a to-be-controlled vehicle enters a braking mode, the deceleration and the running speed of the to-be-controlled vehicle are obtained; according to the deceleration, the road surface type of the road surface where the to-be-controlled vehicle is located is recognized, and the road surface type is the type obtained by dividing the road surface based on the adhesion coefficient; and determining a liquid supplementing strategy according to the road surface type and the driving speed, and controlling the to-be-controlled vehicle to supplement liquid based on the liquid supplementing strategy. The method has the core advantages that the attachment type of the current road surface is recognized by obtaining the deceleration and the driving speed of the vehicle, and the optimal liquid supplementing strategy is selected accordingly. According to the method, the inherent defect that a traditional fixed parameter fluid infusion strategy is single in performance under different road conditions is overcome, and the performance optimal balance within the full working condition range is achieved. The intelligent self-adaptive mechanism greatly improves the comprehensive performance and the driving experience of the brake-by-wire system.

The invention discloses a clamping force control method for an electronic mechanical braking system, and belongs to the technical field of automobile brake-by-wire. The method comprises the following steps: step 1, establishing a mechanical model of the electronic mechanical braking system; step 2, based on the mechanical model, designing a high-order linear extended state observer HLESO for estimating total disturbance and uncertain items of the system; 3, the total disturbance of the system observed by the HLESO serves as a feedforward control item, and a fast terminal sliding mode controller FTSM is designed; 4, designing a fuzzy corrector to carry out smooth transition on the discontinuous characteristics of the switch control items of the FTSM; and 5, when the vehicle enters a braking state, braking is achieved through the HLESO-FTSM control strategies in the steps 3-4. According to the invention, the long-term stability of the EMB system under complex working conditions is improved, the control process is simplified, and the control bandwidth and response speed of the system are greatly improved.

The utility model discloses an electronic pedal structure for brake-by-wire, which comprises a pedal support and a pedal arm rotationally connected to the pedal support through a pedal shaft, and further comprises a pedal simulator arranged below the pedal arm, the pedal simulator is provided with a central axis, and the pedal simulator can stretch out and draw back in the extending direction of the central axis. The two ends of the pedal simulator in the telescopic direction are flexibly connected with the pedal arm and the pedal support respectively, the pedal support is provided with a mounting face, the included angle between the mounting face and the central axis ranges from 80 degrees to 100 degrees, and projections of the pedal shaft and the pedal simulator on the plane where the mounting face is located are staggered. The height of the pedal support in the electronic pedal structure is small, so that the structural size of the pedal support is small; in addition, the electronic pedal structure and an original hydraulic brake pedal can be installed on an automobile in a replaceable mode, and therefore the transition requirement of the hydraulic pedal and the electronic pedal is met in stages.

The invention relates to the technical field of vehicle control, and discloses a steering-braking cooperative control method, system and equipment during brake-by-wire failure, and the method comprises the steps that running state information of a vehicle is acquired; on the basis of the running state information, whether electronic mechanical brake wheels fail or not is judged; if yes, the braking force deviation of the failed wheel is determined according to the running state information; yawing moment deviation is generated according to the braking force deviation; generating a feed-forward compensation rotation angle based on the yawing moment deviation; determining a feedback compensation rotation angle according to the operation state information; and generating a steering compensation angle for steer-by-wire based on the feedforward compensation rotation angle and the feedback compensation rotation angle. The control system has the beneficial effect that the safety performance and the control reliability of the whole vehicle are improved.

This application describes examples of a brake-by-wire system and a control method. In one example, a braking control system includes a brake master cylinder, a first pressure booster, a second pressure booster, at least one first interface, at least one first control valve, at least one second control valve, at least one third control valve, at least one fourth control valve, and a second pedal feel simulation system. The at least one first interface is connected to at least one brake wheel cylinder, respectively. The brake master cylinder and the at least one first interface are respectively connected through the at least one first control valve. The first pressure booster and the at least one first interface are respectively connected through the at least one first control valve. The second pressure booster and the at least one first interface are respectively connected through the at least one third control valve.

The invention discloses a layered vehicle stability brake control system and a brake control method. A layered vehicle stability braking control system is applied to a vehicle provided with a brake-by-wire system and a steering-by-wire system and comprises a chassis dynamics analysis module and a yawing moment instruction distribution module. The invention discloses a layered vehicle stability braking control method. The braking control step sequentially comprises the steps of determining the corrected yaw moment of a target vehicle, evaluating the availability and the permissibility of active steering control, determining a wheel steering control angle based on the availability and the permissibility of the active steering control, determining the steering corrected yaw moment based on the wheel steering control angle, and conducting braking control. Determining a residual corrected yaw moment based on the target vehicle corrected yaw moment and the steering corrected yaw moment, and determining a brake control instruction based on the residual corrected yaw moment; according to the method, the optimal distribution of the target correction yaw moment can be realized through the synergistic effect of active steering and brake-by-wire.

The invention discloses a clamping force estimation method for a data and model dual-driven electronic mechanical braking system, and relates to the technical field of intelligent vehicle brake-by-wire. The method comprises the following steps: establishing electronic mechanical braking system models and state observers thereof under different precisions; designing a clamping force estimator of the model-driven electronic mechanical braking system by combining an extended Kalman filtering method; after the input features are screened, designing a clamping force estimator of the data-driven electronic mechanical braking system in combination with a time sequence convolutional neural network; estimating values of the model driving estimator and the data driving estimator are fused in real time based on an adaptive weight fusion mechanism, and finally an estimation result with higher precision and higher robustness is obtained. According to the method, the interpretability and real-time advantages of a model driving method and the adaptive capacity of a data driving method to complex non-linear working conditions are fused, and the precision and robustness of clamping force estimation under multiple working conditions and noise interference are effectively improved under the condition that a force sensor is not needed.

The invention relates to the field of brake-by-wire systems, and discloses a control method and system for an automobile brake-by-wire system, and the method comprises the steps: collecting motor operation parameters, environment state parameters and vehicle dynamics parameters; based on the environment state parameters and a pre-calibrated environment compensation parameter table, environment compensation is carried out on the motor current signal and the rotation angle signal; carrying out load correction on the motor current signal and the rotation angle signal which are subjected to environment compensation; identifying a current key characteristic time period and a corner key characteristic time period respectively; generating a system reliability verification coefficient based on cross validation of the current key characteristic time period and the corner key characteristic time period; calculating an actual clearance value between a friction plate and a brake disc based on a system reliability verification coefficient, the corner signal after load correction and a pre-calibrated mechanical transmission parameter; and outputting a brake system control instruction based on the calculated actual gap value.

The invention provides a hydraulic pressure control method for a wheel cylinder of a brake-by-wire system of an electric vehicle. The hydraulic pressure control method comprises the following steps: constructing a nonlinear model of an electronic hydraulic brake system of the electric vehicle; designing a self-adaptive expansion state observer based on an improved particle swarm optimization algorithm to estimate the initial hydraulic pressure of the wheel cylinder of the electric vehicle; taking the estimated initial hydraulic pressure of the wheel cylinder of the electric vehicle as input, and designing a sliding mode attitude controller based on a self-adaptive expansion state observer; the improved sliding mode control method is obtained by improving an objective function and a fitness function established by an alpha evolutionary algorithm, improving a sliding mode surface equation through the objective function and the fitness function, and introducing a chaotic disturbance term, an evolutionary compensation term and a self-adaptive buffeting suppression factor. And the hydraulic pressure of the wheel cylinder of the electric vehicle is controlled through an improved sliding mode control method. According to the invention, high-precision hydraulic pressure control can be realized, and the anti-interference capability is improved.

The invention relates to a non-electromagnetic-valve type mechanical control structure suitable for a drive-by-wire hydraulic brake boosting unit, and belongs to the field of automobile drive-by-wire brake systems. Comprising a simulation main cylinder, a simulator, a power-assisted motor component, a transmission mechanism, a pressurization main cylinder, a controller ECU, a first flow channel, a second flow channel and a third flow channel. The hydraulic drive-by-wire brake unit has the advantages that the structure is novel, mechanical structure control logic is adopted, an electromagnetic valve component used on a traditional hydraulic drive-by-wire brake unit is replaced, the functions of simulation cavity opening and closing, basic brake control and the like are achieved, the control difficulty of an electronic control unit (ECU) is reduced, failure modes caused by electromagnetic valve control are reduced, and product energy consumption is reduced. Reliability and stability of a mechanical structure are brought into full play, and the pedal simulator can be quickly cut off when a control circuit or an electric appliance fails while a pedal feeling simulation function is achieved, so that basic braking of brake fluid is achieved under the action of pedal force of a driver, and safety and reliability of products are improved.

The utility model relates to a zero-position anti-rotation limiting mechanism and an automobile brake-by-wire system, and belongs to the technical field of automobile brake-by-wire systems. The zero-position anti-rotation limiting mechanism comprises a lead screw shaft in transmission connection with a rotor shaft and a lead screw nut matched with the lead screw shaft, one end of the lead screw shaft is sleeved with a nut baffle in an anti-rotation mode, and the nut baffle is provided with a limiting boss I for limiting the lead screw nut located at the zero position to axially return. The problem that phases are difficult to match during installation can be solved, and the situation that parts are damaged or scrapped due to chippings generated by interference fit can be avoided.

The invention relates to an EMB structure capable of achieving mechanical pressurization and pressure relief backup, and belongs to the field of automobile brake-by-wire systems. A main cylinder structure is inserted into a transmission mechanism of an EMB and a pedal simulator structure, when an EMB motor rotates, a push rod pushes a piston to compress oil in a main cylinder, then a caliper piston is pushed to achieve clamping of calipers, and meanwhile an oil outlet hole is reserved in the main cylinder of the EMB and connected to a main cylinder of the pedal simulator. Through opening and closing of the electromagnetic valve and plugging and communication of an oil return hole in the pedal simulator structure, the functions of mechanical backup and emergency pressure relief of braking force are achieved, and the safety redundancy of vehicle braking is greatly improved. Efficient electric control braking, failure redundancy and safe pressure relief are achieved in a single structure, and the reliability is remarkably improved.

The invention discloses a motor and piezoelectricity integrated automobile brake execution device and a control method. A motor driving mechanism comprises a driving motor and a lead screw nut mechanism, and rotary motion is converted into linear motion so as to push a first friction block to establish basic brake force; the piezoelectric driving mechanism comprises a piezoelectric ceramic unit and a displacement amplifying mechanism, the piezoelectric ceramic unit is elongated when voltage is loaded, the connecting end is driven to get close to the middle, only pressure maintaining or pressure reducing rapid adjustment of braking force is achieved, and the capacity of independently applying the braking force is not achieved. Through cooperative work of motor main braking and piezoelectric rapid adjustment, the large-thrust long-stroke braking capacity and the microsecond-level dynamic adjustment performance are both considered, the redundant fault-tolerant capacity is achieved under multi-device distributed layout, and the brake-by-wire system is suitable for L3-level and above automatic driving vehicles; and meanwhile, upgrading and reconstruction of brake systems of traditional fuel vehicles and pure electric vehicles are compatible.

The present application relates to a fully decoupled brake-by-wire method and system, which is applied to the field of brake-by-wire technology. The method includes: detecting whether the brake-by-wire system is powered on normally; if it is not powered on normally or there is a fault after normal power-on, entering a mechanical backup braking mode; if it is powered on normally and there is no fault, detecting whether the brake-by-wire system is in a pedal-powered state; if not, entering a normal brake-by-wire mode; if so, determining whether the stroke of a mechanical push rod at the moment of power-on is greater than a first stroke value; if not, entering a normal brake-by-wire mode; if so, entering a pedal-powered braking mode, controlling the analog cylinder circuit isolation valve to remain closed, controlling the manual cylinder circuit isolation valve to change from an open state to a closed state after power is applied, and determining a target brake pressure based on the stroke of the mechanical push rod and the pressure detected by the manual cylinder pressure sensor. This ensures the output of brake pressure while taking into account brake pedal feel.

The utility model provides a thrust conversion structure for a brake-by-wire system. The thrust bearing assembly is sequentially provided with a supporting disc, a rolling body and a driving disc from front to back, and the supporting disc and the driving disc are provided with roller paths which are matched with the rolling body and have variable depths. The driving disc is provided with an internal thread; the screw rod is provided with an inner cavity and external threads, the inner cavity is provided with a spline hole, the spline hole is matched with a shaft with an external spline, and the external threads and the internal threads of the screw rod form thread pair matching; the piston can axially move, the front side of the piston is the rear end of the screw rod, and the rear end of the piston is used for abutting against the brake disc for braking. A sectional type propelling structure is adopted, when the first section is used for eliminating idle stroke, rotation is converted into linear motion through thread transmission, and when the second section is used for clamping, the rotation motion is converted into linear motion through the reinforcement bearing assembly; the transmission mode of the reinforcement bearing, the screw rod, the screw sleeve and the spline is adopted, so that the structural size of a product is greatly reduced.

The utility model provides a brake-by-wire system pedal assembly fused with a magnetorheological fluid damper to simulate foot feeling. The brake-by-wire system pedal assembly comprises a pedal and the magnetorheological fluid damper. The pedal is composed of a brake rod, a ball pin base, a pedal supporting frame, a bearing assembly, a rotating shaft and a pedal panel. A pedal panel is fixedly installed at one end of the brake rod, the other end of the brake rod is installed on a rotating shaft, and the rotating shaft is installed on a pedal supporting frame through a bearing assembly. A ball pin base is fixedly installed below the brake rod, a ball pin is installed in the ball pin base, and one end of the ball pin is connected with an upper piston rod of the magnetorheological fluid damper. According to the brake-by-wire system pedal assembly, the foot feeling damping force can be rapidly adjusted according to different position changes and the requirements of a user, and a more accurate and personalized foot feeling feedback function is achieved.

The utility model relates to the technical field of automobile drive-by-wire brake, in particular to a waterproof ventilation valve adaptive to a drive-by-wire brake motor and a simulation cylinder, which comprises a waterproof ventilation valve, a simulation cylinder cover, a valve block and a motor, the waterproof ventilation valve comprises a valve main body, a protective cover, a waterproof ventilation film and a rubber ring, a threaded pipe is arranged at the bottom end of the valve main body, and the waterproof ventilation film is arranged in the threaded pipe. The waterproof breathable valve is in threaded connection with the threaded hole through a threaded pipe, an airflow channel is formed in the threaded pipe in a penetrating mode, the threaded pipe at the bottom end of the valve body is connected with the threaded hole of the valve block through a conical thread, self-locking anti-loosening and rapid dismounting and mounting are achieved, and a waterproof breathable film is fixed to an annular boss on one side of a step face through laser welding. The protection cover is installed on the valve body through the through hole, the avoiding groove in the lower end of the protection cover enables the buckle to be retracted and then reset, a closed cavity is formed, large foreign matter is prevented from impacting and damaging the waterproof breathable film, and dirt is prevented from covering the waterproof breathable film.

The application provides a kind of based on reinforcement learning's line control brake system electromechanical compound brake smoothness control method, this method includes the following steps: obtaining the current operating state data of vehicle and constructing state space vector;State space vector is composed of sliding window state sequence, input to the reinforcement learning intelligent agent model pre-trained, output basic distribution proportion coefficient;Target total brake torque is analyzed into target motor brake torque and target line control friction brake torque;In the transition window period of dynamic handover of motor brake and line control brake, the dynamic error between target deceleration and actual longitudinal deceleration is calculated in real time;When dynamic error is greater than zero and exceeds preset dead zone threshold, generate transient compensation torque instruction and send to motor controller, so that the actual output torque of drive motor is the sum of target motor brake torque and transient compensation torque.The application realizes the continuous smooth transition of vehicle braking force in brake mode dynamic switching process.

The application discloses a line control brake valve body support die-casting device and belongs to the technical field of die-casting. The device comprises a base, a mounting frame and a water tank with an open top are fixedly installed on the base, a water inlet and a drain are arranged on the side walls of opposite sides of the water tank, a hydraulic cylinder applies downward pressure on a female die and a male die, and the pressure is greater than the elasticity of a first spring. Therefore, a top rod gradually retracts into a sleeve. In this process, the female die and the male die in a closed die state move downward together and gradually immerse below the liquid level in the water tank. When the female die and the male die in the closed die state are completely immersed below the liquid level, uniform cooling of the metal liquid can be realized. In this process, the metal liquid in the mold cavity is gradually cooled and solidified. The immersion cooling method can reduce the temperature difference of each part of the surface of the female die and the male die, effectively reduce the generation of thermal stress, thereby reducing the defects of the die-castings caused by thermal stress, and improving the forming quality of the workpiece.

This application provides a vehicle redundancy safety control method and system. The method includes: determining whether a drive-by-wire chassis meets the conditions for drive-by-wire braking; if the drive-by-wire chassis does not meet the conditions for drive-by-wire braking, sending a first braking level signal to a redundant control unit; wherein the redundant control unit is used to send a first pneumatic braking command to the drive-by-wire chassis based on the first braking level signal; the drive-by-wire chassis is used to execute a pneumatic braking operation according to the first pneumatic braking command; if the drive-by-wire chassis meets the conditions for drive-by-wire braking, determining whether each non-braking module on the drive-by-wire chassis reports an error; if a non-braking module reports an error, sending a first drive-by-wire braking command to the drive-by-wire chassis; wherein the drive-by-wire chassis is also used to execute a drive-by-wire braking operation according to the first drive-by-wire braking command. This method improves the stability of vehicle drive-by-wire braking.

A brake pedal module for a brake-by-wire brake system of a vehicle is disclosed, having a brake pedal, which can be secured pivotably on the vehicle and can be moved between a rest position and an end position, and a feedback unit for producing a resistance during actuation of the brake pedal. The feedback unit has a first counterforce unit, which urges the brake pedal into the rest position, and at least one further counterforce unit, which acts in parallel with the first counterforce unit as regards their interconnection, and / or a damping unit, which acts in parallel with the first counterforce unit as regards their interconnection.

The utility model provides a vehicle brake-by-wire mechanism which enables a brake system to be high in integration degree, accurate in brake force and easy to control and install. The mechanism comprises a lead screw motor assembly, a spring assembly and a brake master cylinder assembly, the lead screw motor assembly comprises a lead screw motor, a motor support and a guide rail. The spring assembly comprises a spring upper end cover, a compression spring, an end cover, a piston and a spring base; the upper end cover of the spring is meshed on a screw rod of the screw rod motor and is limited to rotate through a guide rail mounted on the motor bracket, so that the upper end cover moves left and right on the screw rod; the compression spring is arranged between the spring upper end cover and the spring base and is compressed or restored according to the left-right movement of the spring upper end cover; the piston moves left and right in the cylinder body of the spring base and rubs with the inner wall of the cylinder body so as to reduce vibration of the spring in the braking process. The top of the spring base is provided with an end cover through a screw, piston installation is facilitated, and meanwhile the main cylinder is pulled reversely to release braking force.

The application relates to a drive-by-wire chassis redundancy control method, a system and a vehicle. The method is applied to a drive-by-wire chassis redundancy control system of a vehicle, and the drive-by-wire chassis redundancy control system at least comprises a brake pedal module, a control module and two execution modules. The method comprises the following steps: obtaining a fault condition of at least one target wheel in a drive-by-wire brake system, generating a brake request through the brake pedal module based on the fault condition, and sending the brake request to the control module; the brake request comprises brake data; converting the brake data into brake demand data through the control module, mapping the brake demand data into target electrical parameters, generating an execution instruction based on the target electrical parameters, and sending the execution instruction to the execution module; and the execution module brakes the target wheel according to the execution instruction. Through the above method, a brake signal can be accurately generated for a wheel that has failed to control, safe redundancy guarantee is provided for the vehicle, and the safety of a tester or a driver is ensured.

The utility model discloses an integrated type line control brake system and vehicle, include: the motor control module for realizing motor control, with the motor control module is connected for monitoring motor control module's control monitoring module, with control monitoring module is connected for monitoring control monitoring module's hardware monitoring module, integrated type line control brake system is used for through control monitoring module to the monitoring of motor control module to control monitoring module's monitoring of hardware monitoring module, improves the security level of system.

Provided in the present application are a braking failure control method and system for a vehicle, and an electronic device and a medium. By means of performing detection on a brake-by-wire system, a vehicle braking failure is identified; on the basis of different wheel braking failures, different braking forces are controlled; for a wheel with a braking failure, braking is performed by means of performing braking energy recovery control by a wheel-side / hub driving electric motor; and when a braking request of a driver is responded to the greatest extent and the stability of a vehicle is also taken into consideration, an insufficient electric motor braking torque for a wheel with a braking failure is transferred to a wheel with normal braking, and a braking force for the wheel with a braking failure is redistributed to a wheel without braking failure, so as to realize braking failure control for the vehicle. By means of the present application, the safety and stability of vehicle traveling are ensured while ensuring that braking requirements of a driver are met; in addition, since braking is performed by using an electric motor to perform energy recovery, the economy of vehicle driving is improved.

A braking system (1), in particular of the Brake-By-Wire type, comprising an electromechanical actuation device (3) extending along an actuation axis (4); a hydraulic chamber (5), extending substantially coaxial to the actuation axis (4), and configured to contain hydraulic fluid (10), wherein the electromechanical actuation device (3) comprises an electric motor (2); a motion converter (6) configured to transform a rotary motion into a translatory motion and comprising a rotation component (8) and a translation component (9) operatively connected to each other, wherein the translation component (9) comprises a pressure wall (11) and a sliding wall (12) at least partially slidingly housed inside the hydraulic chamber (5), so that a rotation of the rotation component (8) about the actuation axis (4) corresponds to a translation of the translation component (9) along the actuation axis (4), inside the hydraulic chamber (5), wherein the translation component (9) is translatable between a maximum retraction position and a maximum extension position, and wherein the pressure wall (11) is configured to act in pressure on the hydraulic fluid (10) in the hydraulic chamber (4), upon a translation of the translation component (9) towards the maximum extension position, so as to actuate the braking assembly.

This invention discloses an adaptive robust brake-by-wire method and system, relating to the field of vehicle brake-by-wire technology. The method comprises the following steps: S1, establishing a multi-coupled dynamic mathematical model of the brake-by-wire system and determining the system state variables and control inputs; S2, online observation and approximation of the system's hydraulic coupling disturbances, mechanical friction disturbances, and external road surface disturbances; S3, designing a hierarchical adaptive robust control based on backstepping sliding mode control technology and combined with observations from a multi-disturbance observer; S4, adjusting the gain coefficient of the sliding mode control online; S5, verifying the asymptotic stability of the entire control system; and S6, converting the designed control law into an electrical signal and inputting it to the actuator of the brake-by-wire system. This invention achieves precise, rapid, and stable control of braking pressure under complex operating conditions, improving the robustness and adaptability of the brake-by-wire system.

The utility model belongs to the technical field of vehicle braking, and particularly relates to a brake-by-wire system and a wide-body mining dump truck, which comprise an air supply unit, a multi-loop protection valve, a braking execution unit, a pair of front axle braking air chambers, a plurality of pairs of middle and rear axle braking air chambers, a front axle braking loop, a front axle air cylinder, a single-channel EBS valve and a middle and rear axle braking loop, comprising a middle-rear axle air cylinder, a multi-channel EBS valve, a service brake valve and an electromagnetic relay valve. According to the utility model, the electromagnetic relay valve is arranged, the air inlet is communicated with the middle and rear axle air reservoir, the first air outlet is communicated with the control port of the single-channel EBS valve, and the second air outlet is communicated with the control port of the multi-channel EBS valve, so that an air braking safety system and an electronic braking safety system are combined, and an automatic braking auxiliary function is realized; the braking system can actively brake when encountering sudden dangerous situations or the distance between the braking system and a front vehicle and pedestrians is smaller than the safe distance, and therefore the performance and safety of the braking system are improved.

The present invention relates to the field of vehicle control technology and discloses a brake-by-wire calibration method, device, and apparatus. The method comprises obtaining vehicle gross mass, brake pedal travel data, vehicle speed data, and brake pressure data; performing a difference calculation based on the vehicle speed data to obtain wheel speed difference; combining a brake distribution coefficient model with the gross vehicle mass, vehicle speed data, and wheel speed difference to perform a brake distribution calculation to obtain a brake distribution coefficient; performing a brake torque calculation based on the gross vehicle mass, brake pressure data, and brake distribution coefficient to obtain a brake torque compensation value; performing a brake force correction calculation based on the gross vehicle mass and brake pressure data to obtain a brake force correction value; and performing a PID closed-loop system control calculation based on the brake torque compensation value, the brake force correction value, and brake pedal travel data to obtain a motor torque output value. This method accurately calculates the braking force and output torque, thereby ensuring braking reliability and stability.

The invention relates to a mechanical decoupling drive-by-wire brake and a brake system. The mechanical decoupling drive-by-wire brake comprises a motor power-assisted mechanism, a pedal actuating mechanism, a mechanical decoupling mechanism, a hydraulic establishing mechanism, a brake wheel cylinder mechanism and a brake structural part. In the on-line control braking process, a braking control system controls a braking motor to rotate, speed reduction and torque increase of the braking motor are achieved through a first-stage driving gear, an intermediate shaft gear combination and a gear nut, rotating motion of a large gear is converted into translational motion of a lead screw, a holder, a push rod connector, a rubber gasket, a main cylinder push rod base and a large spring base are pushed, a large spring is compressed, and the braking motor is driven to rotate. A master cylinder push rod is pushed, pressure building is conducted on a brake master cylinder, the brake master cylinder is connected with brake calipers through a brake pipeline, and braking is achieved through the brake calipers; the lead screw and the hollow push rod are not mechanically connected in the axial direction, in the braking process, translation of the lead screw does not drive the hollow push rod to advance, and therefore the brake pedal does not follow up in the braking process, and mechanical decoupling is achieved.