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

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 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 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 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 utility model relates to a brake-by-wire pedal simulator system, which belongs to the field of automobile brake and comprises an oil path block with a groove, a simulator shell is fixed at the groove, a simulator piston is mounted in the groove in a sliding manner, an oil inlet path communicated with the groove is arranged on the oil path block, and a disc spring group is arranged in the simulator shell; a first piston and a second piston are arranged in the main cylinder in a sliding mode, a first cavity is formed between the first piston and the second piston, one end of a main cylinder push rod is fixedly connected to the first piston, the other end of the main cylinder push rod extends out of the main cylinder and is fixedly connected with a pedal, and the first cavity is communicated with an oil inlet path through a first pipeline. The brake device has the advantages that integration of parts is achieved to the maximum extent, the brake device can be integrated into a brake-by-wire one box to achieve feedback of pedal feeling for a whole vehicle, and meanwhile a hydraulic system can be built through a main cylinder and a peripheral pipeline system to achieve basic brake backup; feedback of different elastic forces is achieved through combination of the disc spring sets, and therefore the pedal feeling is achieved.

The invention relates to an electromagnetic drive-by-wire brake and a control method. The electromagnetic drive-by-wire brake comprises a brake caliper body, a brake piston, a one-way valve, an electromagnet, a small piston and the like. A sealed hydraulic cavity is formed between the small piston and the brake piston, the small piston is driven through a movable iron core of the electromagnet, pressure amplification is generated in the sealed hydraulic cavity, the brake is driven to work, the current of the electromagnet is controlled through the control system, and control over the brake strength is achieved.

A brake pedal assembly (10), particularly for a brake-by-wire system, for a vehicle, has a brake pedal (12) with a lever (14) pivotally mounted about a pivot axis (D) between a release position and a maximum actuation position, and a return mechanism (32) that acts the lever (14) into the release position. The return mechanism (32) comprises a leaf spring assembly (30) consisting of at least two leaf springs (31a, 31b, 31c).

The utility model relates to new energy automobile dry type line control brake technology field, concretely relates to a kind of electronic mechanical brake asymmetric parking electromagnet structure, comprising: electromagnet shell, it is formed with the structure of accommodating cavity by multiple bending, the opening direction of accommodating cavity is parallel to the installation surface of MGU lower shell;Electromagnet body, fixedly installed in accommodating cavity;Mounting portion, it is set to the outer surface of electromagnet shell;Electromagnet connector, it is installed on the outer surface of electromagnet shell;Wherein, electromagnet shell is fixed on the installation surface of MGU lower shell by mounting portion, in the present application, first mounting lug and second mounting lug are the flat plate structure integrally formed with electromagnet shell, cooperate electromagnet shell relative traditional overturn 90 ° installation mode, manufacturing need not bending, make overall structure compact, small space occupation, greatly improve the installation arrangement efficiency in the limited space of electronic mechanical brake, optimize equipment space utilization.

The application provides a model predictive control-based electric vehicle line control brake response optimization method and device and equipment thereof, and belongs to the technical field of line control brakes. The model predictive control-based electric vehicle line control brake response optimization method comprises the following steps: acquiring real-time running state data of a vehicle; constructing a vehicle dynamics state vector based on the real-time running state data, and generating a target brake force distribution scheme in combination with a preset brake demand instruction; inputting the vehicle dynamics state vector and the target brake force distribution scheme into a pre-constructed line control brake system prediction model, solving an optimal control sequence in a future preset time window through rolling optimization; extracting a first control quantity from the optimal control sequence as a brake force control instruction at a current time, and respectively sending the brake force control instruction to electric hydraulic execution units corresponding to each wheel to drive the electric hydraulic execution units to adjust brake pressure output.

The invention belongs to the technical field of brake-by-wire systems, and particularly relates to a brake-by-wire system integrating brake switch signals and a vehicle. Comprising a push rod connected with a brake pedal arm, a displacement sensor, a pressure sensor and a signal transmission controller, and the displacement sensor is used for detecting the displacement of the push rod, converting the detected displacement of the push rod into two paths of displacement signals and transmitting the two paths of displacement signals to the signal transmission controller; the pressure sensor is used for detecting the pressure of the push rod and transmitting a pressure signal of the push rod to the signal transmission controller; and the signal transmission controller is used for judging whether to send a CAN (Controller Area Network) signal indicating that the brake pedal is stepped down to the brake controller or not after receiving the pressure signal and the at least one path of displacement signal. The brake signal multi-redundancy effect can be achieved, the cost of parts is reduced, the effectiveness of the brake intention of a driver is ensured, the brake safety of the whole vehicle is improved, and the stability of the whole vehicle controller about the brake function safety is ensured.

The utility model relates to an anti-locked-rotor structure of an electric control booster, and belongs to the field of electric control boosters in a new energy automobile braking system. The motor, the ball screw and the hydraulic cylinder take the valve body as a carrier, the axis of the motor, the ball screw and the hydraulic cylinder are coaxially fixed on the valve body through screws or fastening glue, a piston is assembled on the ball screw, a rotor bottom hole in the motor is in radial interference fit with the tail end of a lead screw of the ball screw, the axial end face of the motor is limited, and a gap H is reserved between the bottom end face of a nut and the bottom end face of the rotor. The electric control booster has the advantages that the structure is novel, the locked-rotor problem that a nut and a motor rotor can be separated only by large torque or cannot be separated under a certain motor torque in the forward stroke due to tightening torque generated by contact friction is solved, the manufacturing and assembling process is easy to implement, the electric control booster can be applied to electric control booster products with ball screws, and the electric control booster is suitable for large-scale popularization and application. Conventional braking, brake-by-wire, active collision avoidance, self-adaptive cruising, intelligent driving and braking energy returning of the vehicle are achieved.

The invention discloses a brake-by-wire hardware-in-loop test method, device and equipment and a storage medium, and relates to the field of vehicle EPS tests.The brake-by-wire hardware-in-loop test method comprises the steps that a low-adhesion road surface and a vehicle model are generated, and the action range of acceleration action or brake action of a vehicle is obtained based on test of a test bench; calculating a wheel theoretical rotation state when the vehicle model is accelerated or braked according to the motion amplitude under the low-adhesion road surface; and calculating and generating a physical wheel speed signal corresponding to the theoretical rotation state of the wheel on the test bench to verify the driving anti-skid function and the braking anti-lock function of the ESP system. The hardware-in-the-loop test architecture of calculating the theoretical state by the model and generating the physical signal by the bench is adopted, and the ESP system is activated through the real physical wheel speed signal, so that the driving anti-skid function and the braking anti-lock function of the ESP system are verified. The generation, transmission and acquisition chains of wheel speed signals in a real vehicle are reproduced, and the problem of signal feature distortion is avoided.

This invention relates to the field of braking control, and discloses a failure redundancy control method for a brake-by-wire system, a vehicle, and a storage medium. The failure redundancy control method for the brake-by-wire system includes: acquiring a braking signal; calculating and obtaining braking output force values ​​multiple times based on the braking signal, and transmitting these multiple braking output force values ​​to a main controller, a secondary controller, and a wheel-side braking assembly; determining whether the braking output force values ​​transmitted to the main controller and the secondary controller have failed; and when the braking output force values ​​transmitted to the main controller and the secondary controller have failed, the wheel-side braking assembly performs braking. This invention establishes a multi-level redundant control architecture, providing extremely high failure tolerance and greatly improving the system's survivability and safety under extreme fault conditions.

The utility model belongs to the field of vehicle brake, especially relates to a line control brake power unit of compact structure, including motor, the motor includes the casing, sets up and the stator and rotor in the casing, the casing have an open end, be equipped with the first limit step on the casing inner wall close to the open end, still include an installation partition, and the installation partition is installed in the casing and leans against the first limit step, the installation partition be used for the rotor passes through and supports the rotor, still include the sensor assembly of being connected on the installation partition, the rotor be equipped with the inductive vane cooperation with sensor assembly, and the inductive vane is with the outside of sensor assembly, the utility model discloses the sensor assembly and the integral design of installation partition, on one hand can reduce the space occupation, thereby satisfy the design requirement of power unit miniaturization, on the other hand, can complete the assembly and calibration of sensor assembly and motor before assembly assembly, need not carry out calibration on line, thereby promotes assembly assembly efficiency.

The invention relates to the technical field of automobiles, in particular to a control method and system for restraining brake jitter, a vehicle and a storage medium, and the method comprises the steps that brake jitter characteristics are recognized according to sensor signal input, and the brake jitter compensation torque of each wheel is calculated; the reference target braking torque of the current brake is obtained; and superposing the brake jitter compensation torque and the reference target brake torque to obtain the actual target brake torque of each wheel, and further solving the required brake clamping force of each wheel to suppress the jitter of the automobile during braking. Based on the brake-by-wire system with the four-wheel electromechanical brake module, the brake force fluctuation can be controlled and compensated through the active brake force, so that the brake shake is inhibited, and the brake comfort is improved.

The invention discloses a method for realizing redundant braking in a brake-by-wire circuit system. The circuit system comprises a control subsystem, a left H-bridge parking circuit, a right H-bridge parking circuit and external motors, and the control subsystem is connected with the two external motors through the left H-bridge parking circuit and the right H-bridge parking circuit. The control subsystem comprises a main chip, an auxiliary chip, a main driving signal switching module and an auxiliary driving signal switching module, wherein the main chip and the auxiliary chip play a control role, and the main driving signal switching module and the auxiliary driving signal switching module play a signal switching role. The implementation method comprises three modes: a normal mode, a main chip failure mode and an auxiliary chip failure mode. The redundant braking requirement of the new energy electric vehicle on the brake-by-wire circuit system is met, the problem that in the driving signal switching process, it cannot be guaranteed that the two calipers are in the maximum clamping state is solved through the redundant braking implementation method, and the use safety of the brake-by-wire circuit system is improved.

The invention provides a brake-by-wire system distance analysis simulation method, system and device and a medium, and belongs to the technical field of vehicles. The method comprises the following steps: calculating a whole vehicle locking torque and a braking torque required by a drive-by-wire brake according to a whole vehicle axle load distribution parameter and a dynamic axle load transfer parameter, determining a motor torque requirement according to the required braking torque, the whole vehicle locking torque and a transmission system parameter, and building a brushless motor dynamic simulation model, a transmission system model and a brake caliper model, the model and a whole vehicle model are subjected to integrated simulation, conversion from the clamping force of the drive-by-wire brake to the braking torque is achieved by inputting the maximum target motor torque, braking distance simulation analysis is achieved, the nonlinear response process of the drive-by-wire brake is accurately simulated, and the braking distance of the drive-by-wire brake is accurately simulated. Scheme decomposition of components such as the power and the highest rotating speed of a motor, the inertia of a rotor, the transmission ratio and the lead of a ball screw can be achieved according to a braking distance simulation result, and performance parameters of all parts in the drive-by-wire brake are determined.