6705results about "Braking action transmission" patented technology

The invention discloses a braking pressure degradation strategy of an electronic mechanical braking system, and belongs to the technical field of vehicle braking control, and the braking pressure degradation strategy of the electronic mechanical braking system comprises the following steps: S1, multi-sensor fusion is carried out to correct a friction coefficient in real time, and a high-precision gridding pavement model is constructed; s2, performing time sequence prediction on braking torque distribution, dynamically constraining a braking pressure threshold value and performing pre-adjustment; s3, reinforcement learning is carried out to generate a prospective degradation sequence, and thermal coupling and pressure fluctuation control are optimized; s4, dynamically encrypting the hierarchical communication architecture, and ensuring that the instruction is complete and consistent with the time sequence through redundancy switching; s5, generating an adversarial network compensation failure signal, and dynamically adjusting the weight of the sensor to resist interference; s6, triggering a man-machine interaction strategy in a grading manner, and dynamically adjusting a safety threshold in combination with a driving behavior; s7, carrying out simulation verification on the digital twin platform, and carrying out fault injection encryption to update full-life-cycle parameters; the method has the beneficial effects that self-adaptive optimization and hierarchical fault tolerance of the brake pressure are realized, and the system safety and response efficiency are improved.

The invention discloses a dual-electric brake boosting system for a heavy-duty vehicle and a coordinated control method of the dual-electric brake boosting system, and relates to the technical field of vehicle brake control. The invention discloses a dual-electric brake power-assisted system for a heavy-duty vehicle and a coordinated control method thereof. The coordinated control method comprises the following steps that S1, a multi-source sensor synchronously collects and preprocesses wheel speed, current, suspension and pedal signals; s2, estimating the load in real time through Kalman filtering, and outputting a dynamic load coefficient to guide distribution; s3, triggering interruption when the pedal force change rate exceeds the threshold value, and directly outputting the maximum braking force; s4, dynamically distributing the braking force, predicting the temperature rise, and adjusting the output weights of the double boosters; s5, outputting a digital twinborn verification theory, and starting a compensation algorithm after deviation overrun; s6, encrypting an instruction by a TSN protocol, and ensuring low-delay transmission and communication security; s7, a closed-loop optimization link is formed based on the actual braking data calibration model; the method has the beneficial effect that the real-time performance, safety and reliability of the braking system are comprehensively improved.

The invention discloses a vehicle braking torque adjusting method and system based on multiple input signals. The vehicle braking torque adjusting method and system aim at improving the safety, driving experience and braking efficiency of a vehicle in a complex environment. The system collects the vehicle driving state, the intention of a driver and the road friction condition in real time through a plurality of sensor modules, and accurate data support is provided for brake control. According to the diversified input, the system can intelligently recognize the road surface state and dynamically adjust the braking torque gradient, the braking response is optimized, and the stability of the vehicle in various driving environments is ensured. The sudden change and step phenomena in the braking process are smoothed through a feedforward control algorithm, the driving experience is improved, instability caused by system switching control strategies is avoided, and based on motor back electromotive force spectrum analysis, the system can accurately adjust energy recovery and improve the energy utilization efficiency of the vehicle. And powerful support is provided for improving the braking performance, the safety and the automatic driving technology of modern vehicles.

Disclosed is a wheel cylinder and a drum brake having the same, in which the number of position as well as other elements accompanied with the piston may be reduced, resulting in reduced manufacturing cost.

The invention provides a clamping force estimation method of a motor braking system, the motor braking system, a transmission efficiency anomaly detection method of the motor braking system and a vehicle, and belongs to the technical field of vehicle braking. According to the clamping force estimation method, temperature data and piston displacement data are combined, the clamping force can be estimated more accurately, the influence of the temperature on the clamping force is considered, and the clamping force estimation is dynamically adjusted by obtaining the piston displacement data in real time, so that the clamping force estimation method adapts to different working environments and braking working conditions. In addition, by combining the original thickness and the abrasion loss of the friction plate, the influence of abrasion of the friction plate on the clamping force is further compensated, and the estimation accuracy is improved.

The invention relates to the technical field of automobile braking, in particular to an EMB system active calibration method and device.The method comprises the steps that the current and temperature of a brake motor winding in an automobile are collected in real time, the temperature of a brake disc in the automobile and the running speed of the automobile are collected in real time, and based on the current temperature change of the brake motor winding, the braking accuracy of the brake motor winding is improved; compensating the current current of the brake motor winding; determining a wear sensitive factor of the current brake; according to the difference between the clamping rotation angle and the back-off rotation angle of the current and previous multiple braking, the accumulated net rotation angle of the current braking is determined; acquiring a current temperature correction coefficient and a speed correction coefficient; the dynamic wear rate of current braking is determined in combination with the accumulated net rotation angle; and triggering active calibration of the EMB system through the wear sensitive factor and the dynamic wear rate, determining a brake pad wear coefficient based on the wear sensitive factor, and correcting the target rotation angles of the left caliper and the right caliper. Therefore, the braking precision of the EMB system is improved.

The invention provides a vehicle control method and system in an emergency braking scene. According to the method, the target slip rate range is dynamically adjusted by establishing an optimal slip rate data set under different road surface conditions and combining a digital model to simulate contact characteristics of tires and road surfaces; collecting vehicle motion state data, analyzing abrupt change characteristics and a tire stress change trend, and generating an early warning signal; inputting the target slip rate range and the early warning signal into a predictive control model, calculating the braking force of each wheel and generating a control instruction; simulating an expected slip state by using a digital tire model, and determining a pressure control value by referring to a friction force change rule; by comparing actual measurement and simulation results and combining with the pressure change rate of the brake hydraulic system, model parameters are corrected, and a pressure control value is adjusted, automatic adjustment of the brake force is achieved. According to the technical scheme, the stability and safety of the vehicle under the emergency braking condition are remarkably improved.

The invention relates to an electronic mechanical braking system control method based on contact point detection and mode management. Comprising the following steps: step 1, designing a clamping force basic control algorithm based on stiffness characteristics and feedforward compensation of Stribeck friction in combination with a proportional-integral-differential control theory; 2, designing a contact point detection algorithm based on position signal identification by analyzing the typical characteristics of the contact points, and identifying the inherent relation between the position stable points and the contact points through experimental calibration; and step 3, designing a mode management system including clearance elimination, clearance keeping and clamping force control, and performing mode switching and keeping by judging a brake signal. The overall function design of contact point detection, mode management and brake control of the electronic mechanical brake system is comprehensively achieved, the control precision and function stability of the system can be remarkably improved, and a set of complete solution is provided for design and development of the brake-by-wire system in the future.

The invention relates to the technical field of vehicle drive-by-wire function safety, and discloses a brake-by-wire and steering-by-wire fault reconstruction system and a vehicle redundancy architecture wherein a fusion diagnosis module is used for obtaining sensor parameters in a brake subsystem and a steering subsystem in real time through a plurality of sensors; the fault reconstruction module is used for performing multi-level fault reconstruction on the braking subsystem based on a three-level response mechanism according to the fault type and the fault severity level; performing redundancy control link dynamic switching on the steering subsystem; and the resource scheduling module is used for determining the energy distribution proportion of brake locking and steering differential motion according to the voltage of the shared emergency power supply. According to the embodiment of the invention, the global composite fault criterion library is constructed through the fusion diagnosis module, the multi-dimensional and cross-system combined diagnosis of the braking subsystem and the steering subsystem is realized, the complex fault mode can be effectively covered, the recognition and response capability of the system to multiple concurrent faults is improved, and the safety degree of the vehicle is further improved.

A brake system includes a reservoir and first and second motor-driven master cylinders. An electronic control unit is provided for controlling at least one of the first and second master cylinders responsive to at least one brake pressure signal. A secondary power transmission unit is configured for selectively providing pressurized hydraulic fluid at first and second PTU outputs for actuating first and second pairs of wheel brakes in at least one of a normal non-failure braking mode and a backup braking mode. Each of the first and second PTU outputs provides fluid to a corresponding one of the first and second pairs of wheel brakes. The secondary power transmission unit is directly fluidly connected to the reservoir.

The invention relates to a brake system including at least one brake with an electric brake actuator, at least one electronic control unit for controlling the at least one electric brake, and two different power supply units connected to the at least one electronic control unit and configured for supplying energy to the at least one electric brake actuator. The at least one electronic control unit comprises a first brake actuation system for activating the electric brake actuator and a redundant brake actuation system for activating the electric brake actuator in case of a failure of the first brake actuation system. The invention also relates to a method for using the brake system.

An electrohydraulic multi-circuit power brake system for autonomous driving. The power brake system includes a piston-cylinder unit for each brake circuit, using which the brake circuits are connected to a common power brake pressure generator. In the event of a failure of the power brake pressure generator, the power brake system can be actuated with a hydraulic pump of a slip control system of the vehicle brake system.

An electromechanical brake system (10) includes a first energy supply apparatus (20) and a second energy supply apparatus (21), a first system control device (30) and a second system control device (31), a plurality of electromechanical brake actuator devices (41), and a first plurality and a second plurality of electronic brake control systems (40a, 40b). Each of the electronic brake control systems is set up to control one of the electromechanical brake actuator devices. The first energy supply apparatus is connected to the first system control device and to each of the first electronic brake control systems, and the second energy supply apparatus is connected to the second system control device and to each of the second electronic brake control systems. A further control device (32, 47) may be connected to at least one of the first electronic brake control systems or one of the second electronic brake control systems.

An electronic control unit for an electronic brake system, and a hydraulic assembly are disclosed. The electronic control unit comprises: a housing having a hydraulic block which is mounted on the front surface thereof and in which a plurality of valves, a flow path, and a pump are provided in order to regulate hydraulic brake pressure transmitted to a plurality of wheel cylinders; a control unit for controlling the plurality of valves and a motor which is accommodated in the housing and provides power to the pump; a first connector provided at the front surface of the housing so that the control unit can be electrically connected to an external device; and a second connector, wherein the first connector is disposed above the position at which the hydraulic block is mounted, and the second connector can be disposed below a reservoir mounted at a first side surface of the hydraulic block.

The method comprises the following steps: judging whether each wheel clamping force sensor works normally, if so, directly obtaining a brake clamping force as a final brake clamping force, if not, obtaining a first brake clamping force through a motor model, and if not, obtaining a second brake clamping force through a motor model; second brake clamping force is obtained through the brake friction plate model, and fusion is conducted through the fuzzy logic weight algorithm to obtain final brake clamping force; judging whether the wheel has a locking risk or not, if not, calculating the current ground longitudinal force of the wheel according to a kinetic model of the wheel, if so, triggering longitudinal force locking logic, and acquiring the current locking ground longitudinal force as the current ground longitudinal force of the wheel; calculating the current utilization adhesion coefficient of each wheel in combination with the vertical force; and determining the road surface type of the vehicle by using a fuzzy rule based on the adhesion coefficient of each wheel. According to the invention, the problem of low identification precision is solved.

The invention provides a passenger car braking energy recovery control method and system based on series control, and the method comprises the steps: monitoring the position of a brake pedal and the speed of four wheels through a linear Hall sensor and a magnetoelectric wheel speed sensor, collecting battery state data through a distributed battery state monitoring system, and processing the data through Kalman filtering to detect an abnormal value; the method comprises the following steps: constructing a braking demand prediction model combining LSTM and GNN, predicting a braking demand according to a real-time driving state, performing multi-target dynamic optimization by adopting a non-dominated sorting genetic algorithm II, determining an optimal braking torque distribution strategy, establishing a self-adaptive slope calculation model according to a real-time load and a road surface friction coefficient, and dynamically adjusting sliding braking intervention and exit rates. A hierarchical energy recovery control strategy is set, a priority mechanism is set, it is ensured that the optimal energy recovery strategy is selected when various conditions are met, and a forced quit mechanism is set for the conditions that an active safety system is activated, the battery temperature is too high and the like to guarantee safety.

An electronic brake system and an operating method thereof are disclosed. Provided is an electronic brake system, according to the present embodiment, comprising: a first hydraulic pressure supply device for generating hydraulic pressure by means of an electric signal output in response to the displacement of a brake pedal; an oil pressure control unit including a first oil pressure circuit for controlling the hydraulic pressure of a first wheel cylinder and a second wheel cylinder, and a second oil pressure circuit for controlling the hydraulic pressure of a third wheel cylinder and a fourth wheel cylinder; and a second hydraulic pressure supply device which is connected between the first oil pressure circuit and the first and second wheel cylinders, and which generates hydraulic pressure by means of an electric signal if the first hydraulic pressure supply device and / or the oil pressure control unit malfunctions.

A vehicle braking system may include a first EMB assembly associated with a first wheel, a second EMB assembly associated with a second wheel, a third EMB assembly associated with a third wheel, a fourth EMB assembly associated with a fourth wheel, a control module to control application of signaling and power for operation of the first, second, third and fourth EMB assemblies where the power is provided from a first power network and a second power network, a first temporary power supply to backup the first power network, and a second temporary power supply to backup the second power network.

The invention relates to a chassis structure of a vehicle based on corner modules and a control system, the chassis structure of the vehicle comprises the corner modules corresponding to four wheels of the vehicle respectively, in each corner module, a wheel side motor driving assembly is used for directly driving the wheel corresponding to the corner module, and the wheel side motor driving assembly is used for directly driving the wheel corresponding to the corner module. The 90-degree two-way steering execution system is used for driving wheels corresponding to the angle module to realize positive and negative 90-degree steering; the wheel side motor driving assembly and the 90-degree bidirectional steering execution system are separately arranged; the suspension and supporting structure is used for keeping geometric stability of the suspension when the wheels corresponding to the angle modules steer and buffering road impact. The electronic mechanical braking unit is used for achieving braking of wheels corresponding to the angle modules. In this way, synchronous control over steering, driving, vibration reduction and braking of the vehicle in different running modes can be achieved through cooperative work of the angle modules in the wheels of the vehicle, and a vehicle chassis has higher flexibility and more scene adaptability in the running process of the vehicle.

The invention relates to the technical field of vehicle braking control, and discloses a vehicle braking control system based on a high-speed permanent magnet synchronous motor, which comprises a state sensing module, a braking force calculation module, a braking force control module and a braking force control module, the torque distribution module distributes the total braking torque into a predictable regenerative component and a precisely matched friction component, a deterministic regenerative braking force datum line is established, a braking system is converted into stable output control from passive response energy fluctuation, and linear mapping of pedal travel and deceleration is achieved; and meanwhile, by combining road bumping degree perception and model online correction, the output stability is kept under the complex working condition, and the technical problem that energy recovery and control quality in a hybrid braking system are difficult to consider at the same time is solved.

The invention provides an EMB sensorless clamping force estimation method based on multi-signal fusion and displacement compensation, and belongs to the technical field of vehicle braking, and the method comprises the steps: carrying out the modeling of an EMB system mechanical model; on the basis of the EMB system mechanical model established in the step S110, executing clamping force estimation; on the basis of the EMB system mechanical model established in the step S110, current-position information fusion is adopted to execute contact point detection; on the basis of the contact point detection result in the step S130, performing contact point detection position error compensation; on the basis of S140 position error compensation, a return stroke backlash compensation mechanism is introduced, the mechanical transmission gap error is further corrected, and the clamping force estimation precision is improved; and executing clamping force control scheme design based on the results of the steps. According to the method, a good clamping force estimation effect can be achieved, the system reliability is remarkably improved while the cost is reduced, and the method has good engineering application value.

A brake system for a motor vehicle having at least four hydraulically actuable wheel brakes includes a first structural unit (100), in which a first electrically actuable pressure source is arranged, a second structural unit, in which a second electrically actuable pressure source, an electrically actuable inlet valve per wheel brake, and an electrically actuable outlet valve per wheel brake is arranged, and a pressure medium reservoir. The first pressure source and the second pressure source are connected to a brake supply line, to which the at least four inlet valves are connected. The first structural unit and the second structural unit are connected to each other by at most one pressure-resistant hydraulic connecting element.

An apparatus for operating a load-controlled hydraulic supply of an agricultural tractor includes a hydraulic pump which is adjustable with respect to the displacement volume for supplying pressurized hydraulic fluid, a proportional valve which is electrically actuatable, a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump, a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve, and a control unit configured to move the proportional valve into a closed valve position when the control unit recognizes that at least one of a required power of the primary and secondary hydraulic consumers exceeds the conveying capacity of the hydraulic pump and the subordinate hydraulic function of the secondary hydraulic consumer is inactive.

The invention discloses an automobile EMB system clamping force accurate control method based on an extended state observer, and belongs to the technical field of electric automobile EMB systems, and the method comprises the following steps: S1, building a novel EMB system five-degree-of-freedom dynamic model containing a LuGre friction model by using an EMB system dynamic relationship; s2, simplifying the five-degree-of-freedom dynamic model of the novel EMB system, estimating the load torque of an EMB driving motor according to the extended state observer, and then estimating the clamping force of the EMB system according to the load torque and the simplified five-degree-of-freedom dynamic model of the novel EMB system; and S3, replacing the measured value to be a feedback value of clamping force closed-loop control of the EMB system according to the estimated EMB clamping force, and accurately controlling the clamping force by adopting fuzzy PID control. By the adoption of the automobile EMB system clamping force accurate control method based on the expansion state observer, the problems that a pressure sensor is high in cost and automobile braking performance is prone to being reduced are solved, and clamping force response is accurately controlled through a fuzzy PID closed loop.

An electronically controllable pneumatic brake system has a primary service brake pressure modulator, a primary control unit, a secondary control unit that controls the first service brake circuit in the event of a fault, and a secondary service brake pressure modulator connected to the secondary control unit. The secondary service brake pressure modulator is supplied with reservoir pressure and has a secondary working connection for providing a redundancy brake pressure. A parking brake assembly is supplied with reservoir pressure and provides at a parking brake working connection a parking brake pressure for spring brake cylinders. A ventilation valve unit is arranged downstream of the secondary working connection and is connected to the secondary control unit and ventilates the secondary working connection in accordance with a ventilation signal provided by the secondary control unit so as to lower a reservoir pressure in order thereupon to ventilate the spring brake cylinder.

The invention discloses a clamping force estimation method for an electromechanical brake system without a force sensor. A brake information acquisition module, an electromechanical brake evaluation calculation module, a brake disc contact point detection module and an electromechanical brake system clamping force estimation module are included. The purpose of the invention is to accurately estimate the electromechanical braking clamping force of the force-free sensor through a braking information acquisition module, an electromechanical braking evaluation calculation module, a brake disc contact point detection module and an electromechanical braking system clamping force estimation module.

The invention relates to the technical field of vehicle control, and provides a redundancy control method and system for an anti-lock braking system under an EMB system and a vehicle. The redundancy control method comprises the steps that in response to a clamping force request transmitted by a central domain controller, motor control is conducted; the method comprises the following steps: in response to a central domain controller fault signal, judging a vehicle braking working condition, determining an initial clamping force request according to the vehicle braking working condition, triggering braking, adjusting the clamping force request according to a vehicle state, calculating a slip rate based on a vehicle wheel speed, comparing the slip rate with a slip rate target range, and adjusting the clamping force request according to a comparison result. Performing motor control; wherein the slip rate target range is adjusted according to the road surface condition obtained by recognizing the image of the road surface in front of the vehicle. The ABS function has redundancy control, rapid braking is guaranteed, meanwhile, longitudinal braking force and lateral stability are better balanced, and higher guarantee is provided for driving safety.

A system for controlling a wheel brake on an auxiliary axle of a vehicle includes an electro-pneumatic drive axle brake control valve that deliver fluid pressure from a fluid source to a drive axle wheel brake on a drive axle of the vehicle responsive to an electronic control signal. An auxiliary axle brake control valve delivers fluid pressure from the electro-pneumatic drive axle brake control valve to an auxiliary axle wheel brake on the auxiliary axle of the vehicle responsive to a fluid pressure control signal. A fluid control signal generating valve generates the fluid pressure control signal responsive to a command to apply a steer axle wheel brake on a steer axle of the vehicle.

A relationship between a torque of a motor and a braking force generated in the electric brakes has a hysteresis characteristic. When the torque increases, the braking force increases along a positive efficiency line, and when the torque decreases, the braking force decreases along an inverse efficiency line. A prediction unit predicts a change in the required braking force from the present onwards. An operating point adjuster stores a maximum torque on the positive efficiency line and a minimum torque on the inverse efficiency line corresponding to the maintained braking force. The operating point adjuster adjusts an operating point that maintains the braking force in an adjustment zone between the minimum torque and the maximum torque, based on a prediction information from the prediction unit. The torque command calculation unit calculates a torque command value for the motor at the operating point adjusted by the operating point adjuster.

A control method for an electro-mechanical brake including a piston configured to push a brake pad toward a wheel disk through driving of a motor, the control method for an electro-mechanical brake including: detecting positions of the piston and current values of the motor while braking is performed; detecting piston position-based estimated braking force values based on the detected positions of the piston; detecting current-based estimated braking force values based on the detected current values of the motor; determining that a state of the brake pad has changed from an initial state to another state when the piston position-based estimated braking force values and the current-based estimated braking force values are different from each other; determining whether a thickness or physical property of the brake pad has changed when determining that the state of the brake pad has changed from the initial state to the other state; setting a new home position by compensating for a preset home position when determining that the thickness of the brake pad has changed; and detecting an actual braking force value based on a movement distance of the piston from the new home position, wherein the home position refers to a position set so that the piston is disposed at the position at the time of non-braking.