473 results about "Brake pressure" patented technology

The invention relates to a shared bicycle brake pad abrasion monitoring system and a monitoring method thereof, and aims to solve the problems that in the prior art, shared bicycle brake pad abrasion monitoring is high in cost and low in precision, and abnormal abrasion cannot be detected, and accurate monitoring is achieved through a multi-parameter correction model of brake frequency statistics and pressure distribution perception. A microswitch is arranged on a brake pedal, three film pressure sensors are arranged on a brake pad steel backing, a brake pressure value, an average effective pressure Pavg and a pressure distribution difference delta P are synchronously collected, a wear estimation model is built by combining working condition data such as temperature and vehicle speed, and a material coefficient k, a vehicle speed correction coefficient f (v) and a temperature correction coefficient g (T) are adopted for multi-dimensional correction, so that the wear estimation precision is improved. And calculating the accumulated abrasion loss and predicting the residual thickness. Accurate recognition of abnormal wear such as eccentric wear and block falling is achieved by analyzing a delta P threshold value and Pavg mutation characteristics, parameter customization of brake pads made of different materials is supported, and a graded early warning function is achieved.

The embodiment of the invention discloses a vehicle anti-lock braking control method, a medium, equipment and a product. The vehicle anti-lock braking control method comprises the steps that the braking pressure difference of a vehicle in the braking process and multi-modal data used for representing the current road surface where the vehicle is located are obtained; determining a pavement adhesion coefficient of a pavement where the vehicle is currently located, load data of the vehicle and an actual slip rate of the vehicle according to the multi-modal data; calculating a target slip rate of the vehicle according to the road adhesion coefficient, the load data and a preset load; a braking force distribution instruction is generated according to the road adhesion coefficient, the target slip rate, the actual slip rate and the braking pressure difference of the vehicle in the braking process; a brake pressure for anti-lock braking of the vehicle is controlled based on the braking force distribution command. The limitation that a traditional method depends on a single wheel speed signal can be broken through, the control target is dynamically adjusted according to the real-time road surface and the vehicle state, and the problem that traditional fixed slip rate control is insufficient in performance under the complex working condition is solved.

A method and system for providing maximum trailer braking during a high pressure demand, such as during autonomous emergency braking (AEB), for tractor-trailers is provided. The system can include a brake controller of the trailer that uses only tractor anti-lock brake system (ABS) data from the tractor wheels, without using any trailer ABS information, to estimate the surface friction and generate a high or low pressure command to be sent to the trailer based on only the tractor ABS data. The estimation of surface friction may be accomplished using the ABS information from the tractor and the pressure being demanded to determine a percent reduction of pressure requested by the tractor that may be compared to a threshold percentage to differentiate between high and low mu surfaces in real time.

The invention discloses an active suspension control method, a vehicle controller and a vehicle, and belongs to the technical field of vehicles, when a driver steps on a brake pedal to brake the vehicle, target brake pressure can be calculated based on the trampled stroke of the brake pedal, at the moment, a brake system does not control a brake to brake, and the target brake pressure can be calculated based on the trampled stroke of the brake pedal. A front active force of a front suspension is adjusted to a target forward active force in an upward direction, a rear active force of a rear suspension is adjusted to a target rear active force in a downward direction, and the front suspension increases the target forward active force opposite to the sinking movement of the front side of the vehicle before a braking system applies a significant braking force to the vehicle. Meanwhile, the rear suspension increases target rear main power opposite to the lifting motion of the rear side of the vehicle, and resistance is provided for the upcoming forward inclination trend of the vehicle; when the braking system brakes the vehicle, the front side and the rear side of the vehicle are affected by the target front main power and the target rear main power respectively, the initial amplitude and the speed of forward inclination of the vehicle body are restrained, and the comfort of passengers in the vehicle is improved.

A method for controlling a hydraulic motor vehicle braking system, wherein brake pressure is to be built up at wheel brakes on a front axle and a rear axle by means of via an electric pressure supply device based on a brake demand variable. Inlet valves of the wheel brakes on the front axle and rear axle are open and a brake demand variable is implemented by joint pressure build-up on the front axle and rear axle in the case of no fault. In the event of a fault with a degradation of the pressure supply device, the pressure build-up is first applied to the front axle by closing the inlet valves of the wheel brakes of the rear axle before or at the start of volume delivery. When a condition is met, the wheel brakes on the rear axle are activated by opening the inlet valves.

A 3-way solenoid valve, a vehicle brake system including the 3-way solenoid valve, and a controlling method for the same are disclosed. The present disclosure in at least one embodiment provides a brake system for a vehicle, including one or more wheel cylinders configured to apply braking pressure to each of wheels of a vehicle by using hydraulic pressure, one or more of the 3-way solenoid valve configured to increase or decrease the hydraulic pressure supplied to the one or more wheel cylinders, and a braking device configured to supply the hydraulic pressure to the one or more wheel cylinders by using a stepping force applied to a brake pedal or driving of a hydraulic pump.

Methods and systems are provided for controlling braking to avoid groan noise in a braking system. The system has a brake actuator configured to apply a friction force to a moving member, a conduit system coupled with the brake actuator, an inlet valve in the conduit system configured to control fluid pressure delivered to the brake actuator, and an outlet valve in the conduit system configured to control fluid pressure released from the brake actuator. The system includes a controller to monitor for an upper target pressure condition in the braking system, wherein the upper target pressure condition is associated with a noise zone; and operate, when the upper target pressure is detected and in a noise zone avoidance mode, the inlet valve and the outlet valve to avoid brake pressures that generate a brake noise from the friction force.

The disclosure relates to a method for operating an electropneumatic parking brake module for an electronically controllable pneumatic brake system for a vehicle, in particular a commercial vehicle, having a supply port for receiving a supply pressure, at least one parking brake port for the connection of at least one parking brake cylinder, a main valve assembly which receives the supply pressure and is configured to output a spring brake pressure at the parking brake port in dependence on a control pressure, and a pilot valve assembly which receives the supply pressure and is to provide the control pressure, wherein the pilot valve assembly has a bistable valve which can be switched between a first air admission position and a second air release position, and a control unit for providing first and second switch signals to the pilot valve assembly.

The invention discloses a multi-modal data fusion cabin safety monitoring method and system, and relates to the technical field of automobile safety driving. The method comprises the following steps: obtaining personnel, vehicle and environment data in a cabin; the data of personnel in the cabin comprises a driver and passengers, the vehicle data comprises a vehicle speed, an acceleration, a steering angle, a brake pressure and a light state, and the data of environment in the cabin comprises an audio signal in the cabin; performing depth feature extraction and cross-modal feature fusion on the acquired personnel, vehicle and environment data in the cockpit to obtain a cockpit scene feature vector; performing deep semantic analysis and risk assessment on the cockpit scene feature vector to obtain a security situation portrait; a corresponding intervention strategy is generated through a hierarchical decision-making mechanism according to the security situation portrait, the strategy is converted into a specific control instruction, and then the control instruction is converted into actual cabin and vehicle behaviors; a complete safety protection system is formed, and the safety of personnel in the cabin is guaranteed.

The invention provides a vehicle chassis domain controller and a vehicle. The vehicle chassis domain controller comprises at least one single chip microcomputer, a motor driving module and a shock absorber electromagnetic coil driving module. The input end of the motor driving module is connected with the single-chip microcomputer, the output end of the motor driving module is connected with a motor in a vehicle brake circuit, and the motor driving module is used for driving and controlling the working state of the motor so as to adjust the brake pressure of wheels. The input end of the shock absorber electromagnetic coil driving module is connected with the single-chip microcomputer, the output end of the shock absorber electromagnetic coil driving module is connected with a shock absorber, and the shock absorber electromagnetic coil driving module is used for driving and controlling the target current of an electromagnetic coil of the shock absorber according to the first driving control signal received from the single-chip microcomputer so as to adjust the damping force of the shock absorber. The motor driving module and the shock absorber electromagnetic coil driving module are integrated in one controller, so that the performance of the electric control shock absorber system can be improved, and meanwhile, the original functions of the electric control braking system and the electric control shock absorber system cannot be influenced.

A fail-safety valve unit is for a failure braking function of a pneumatic braking system for a vehicle. The fail-safety valve unit has a first and a second failure brake valve configured as monostable valves, and a main line which pneumatically connects a main port, which provides a first pressure, and a failure port. The first and second failure brake valves are connected pneumatically in series in the main line. The first and the second failure brake valves are controllable by different control units. The failure brake valves are open in an open position when not actuated such that the first pressure prevailing at the main port is provided as a failure brake pressure at the failure port such that, in a fault situation, in an electrical failure, and / or in a diagnostic situation, a failure braking operation is triggered via provision of the failure brake pressure at the failure port.

An electro-pneumatic central pressure control module, having at least two channels, implemented as a structural unit for an electro-pneumatic service brake of a vehicle, having at least two pressure control channels which are electrically controllable with regard to a brake pressure. A central electronic brake control device has a board, carrying electrical and electronic components, in which routines at least for controlling the brake pressure and for controlling the driving dynamics are implemented in the electrical and electronic components. At least one inertial sensor is arranged on or at the at least one board and is electrically conductively connected to at least several of the electrical and electronic components on the board so that the output signals of the at least one inertial sensor are integrated into the at least several electrical and electronic components for carrying out the control of the driving dynamics.

The application relates to the technical field of vehicle control, in particular to a self-adaptive cruise control method, device and vehicle. The method comprises the following steps: acquiring state parameters related to a host vehicle and a preceding vehicle; acquiring a current collision time between the host vehicle and the preceding vehicle, and determining a variable adjustment coefficient based on the collision time; adjusting a sliding mode control parameter in a sliding mode control law according to the variable adjustment coefficient, and calculating a desired acceleration according to the state parameters; and setting a torque of an engine of the host vehicle and brake pressure according to the desired acceleration, so as to control the host vehicle to follow the preceding vehicle. Thus, the problem of poor comfort caused by an auxiliary driving control algorithm can be effectively solved.

The invention discloses a brake-by-wire booster pressure control method, electronic equipment and a vehicle, and belongs to the technical field of vehicles. The method comprises the following steps: determining the braking demand pressure of a driver according to a pedal travel sensor signal, a driving mode signal and a current vehicle speed; determining an external brake demand pressure according to the external brake request signal; determining comfortable parking brake pressure according to the current vehicle speed and the current deceleration; brake pressure needed by the ramp is determined according to the gradient sensor signal and the wheel speed sensor signal; acquiring an anti-lock control pressure; determining a braking mode according to the current vehicle speed; and brake pressure output is determined according to the brake demand pressure of the driver, the external brake demand pressure, the comfortable parking brake pressure, the brake pressure needed by the ramp, the anti-lock control pressure and the brake mode. By formulating pressure decision logic and integrating multi-source requests, a coordination mechanism of'maximum value demand and minimum value constraint security 'is proposed for the first time, and system response is ensured to be safe and accurate.

The application discloses a brake system for a pure electric wheel excavator, which comprises a main controller, a power module, an electronic accelerator pedal, a walking system brake module and a rotating system brake module connected with the main controller; when the excavator is in a walking mode and the driving speed and the SOC value of the power module meet preset requirements, the driving state of the whole machine is judged according to the electronic accelerator pedal signal and the brake pressure signal in the walking system brake module, and the brake state of the walking system brake module is controlled; when the excavator is in a digging mode and the driving speed meets preset requirements, the brake state of the rotating system brake module is controlled according to the SOC value of the power module and the rotating speed of the excavator; when the walking system brake module or the rotating system brake module is in a feedback brake state, the electric energy generated is stored in the power module. The application realizes brake energy recovery during walking brake and rotating brake, and increases the whole machine endurance time of the pure electric wheel excavator.

The invention provides a braking control method and device, electronic equipment and a storage medium, and relates to the technical field of vehicle braking. The brake control method comprises the steps that when a brake signal is detected, a target brake pressure curve is generated, and the target brake pressure curve comprises brake pressure curves corresponding to a pressure building stage, a pressure maintaining stage and a pressure releasing stage respectively; and the front wheel brake pressure of the vehicle is controlled according to the target brake pressure curve. According to the method, the pedal operation rule that an experienced driver quickly treads and raises and lifts in the braking process can be converted into an objective control model which can be stably executed by an electronic control system, a basis is provided for subsequent refinement and self-adaptive control, and therefore conditions are created for improvement of braking comfort on the premise of not depending on additional hardware.

The invention provides a pneumatic valve device, a pneumatic brake system and a commercial vehicle. The pneumatic valve device comprises a first air pressure port used for receiving air source pressure of a lower pressure value; the second air pressure port is used for transmitting trailer braking pressure; the third air pressure port is used for outputting trailer brake control air pressure; the first air pressure port is connected with the third air pressure port through a working cavity of the relay valve; the fourth air pressure port is used for receiving the air source pressure with the higher pressure value; the control end of the energy supply valve is connected with the first air pressure port, an air inlet of the energy supply valve is connected with the fourth air pressure port, an air outlet of the energy supply valve is connected with the second air pressure port, the energy supply valve is constructed to make the air inlet and the air outlet communicated when the pressure of the control end of the energy supply valve is larger than an opening threshold value, and the opening threshold value is smaller than the first pressure value. The air source pressure with the higher pressure value can be introduced into the trailer braking system, the energy storage capacity of the trailer braking system is improved, the trailer braking response time can be shortened, and the whole vehicle braking efficiency is improved.

The utility model discloses an explosion-proof diesel engine trackless rubber-tyred vehicle door opening brake protection device which comprises a door opening control valve, a parking brake, a booster pump, a control valve and a safety control device, and the door opening control valve is connected with the safety control device, the booster pump, the control valve and the parking brake through a brake pressure pipeline. Through the fixing mechanism with unique design, the opening process of the cover is greatly simplified, an operator only needs to pull the sliding block upwards to enable the first clamping block to be separated from the first clamping groove, then pulls the side plate outwards to enable the second clamping block to be separated from the second clamping groove, and then the cover can be taken down; and then internal parts of the door opening control valve can be maintained, a wide operation space is provided for maintenance and overhaul of the internal parts such as the door position feeler lever, the clamping ring and the control valve element, and compared with the prior art, the maintenance time is remarkably shortened, the labor cost is reduced, and the equipment maintenance efficiency is greatly improved.

The invention relates to a method for detecting a leak in a power brake system (10) of a motor veihcle. In order to generate a brake pressure (pB), the power brake system (10) comprises a power brake cylinder (66) with a brake piston (74). The method comprises the step of continuously determining (A) a volume-pressure value (p(V)) on the basis of a measured brake pressure (pB) and a brake fluid volume (VFZ) which is displaced from the power brake cylinder (66), during a braking operation (Br). In the event that the volume-pressure value (p(V)) exceeds a specified volume-pressure limit value (pG(V)), the following steps are carried out: summing (B) a tolerated and time- and pressure-dependent brake fluid loss (VB) from the start of the braking operation (Br) until a first refilling process (N1) of the power brake cylinder (66) and before at least one further refilling process (Nn); determining (C) a brake fluid volume (ΔVN) received during each refilling process (N1, Nn); reducing (D) the brake fluid loss (VB) by the brake fluid volume (ΔVN) received during the refilling process (N1, Nn); and determining (E) an error if the brake fluid loss (VB) calculated in this way lies below a volume limit value (VG) before a refilling process (N1, Nn).

The invention provides an electronic control shutdown emergency brake valve for an airplane and a control method of the electronic control shutdown emergency brake valve, and belongs to the technical field of aviation. The electronic control shutdown emergency brake valve specifically comprises a stop valve assembly, a servo valve assembly, a shutdown valve assembly, a change-over valve assembly and an electromagnetic retainer which are arranged in an integrated mode, and the servo valve assembly is connected with the stop valve assembly and the change-over valve assembly through pipelines; the shutdown valve assembly is connected with the change-over valve assembly and the electromagnetic retainer through pipelines. And after receiving the stop braking instruction, the electronic control stop emergency brake valve for the airplane outputs stop braking pressure and keeps the braking pressure, and after receiving the stop braking relieving instruction, the electronic control stop emergency brake valve relieves the stop braking pressure. According to the scheme, the integration level is high, the safety and reliability of the airplane in the stopping and braking process are improved, the response speed is high, the control precision is high, and the braking requirements of the airplane in various complex environments can be met.

The invention discloses a motorcade control instruction generation method, a data center and a program product, and relates to the technical field of intelligent traffic, the method comprises the steps that multiple driving parameters of a head car in a motorcade are collected, and the multiple driving parameters comprise the steering angle, the accelerator opening degree and the brake pressure; according to the collected multiple driving parameters of the head vehicle, a standardized control instruction sequence is generated; and synchronizing the standardized control instruction sequence to the following vehicle in the vehicle team by adopting broadcast communication. According to the motorcade control instruction generation method, the data center and the program product provided by the invention, a mixed formation mode of manual driving of the head car and intelligent following of the rear cars is realized.

The application provides a shipborne helicopter quick clamping device capturing method, comprising the following steps: S1, capturing stroke is detected according to a displacement sensor, and S2 is executed; S2, stroke judgment is performed on the capturing stroke, when the capturing stroke is a short stroke, S3 is executed; when the capturing stroke is a medium stroke or a long stroke, S4 is executed; S3, when a mechanical arm is accelerated to a rated speed, a working condition one strategy is executed; S4, according to the medium stroke or the long stroke, buffer time and uniform motion buffer length of each stage are set, and S5 is executed; S5, according to the buffer time and the uniform motion buffer length of each stage, each stage buffer starting displacement corresponding to the speed of each stage is obtained, and S6 is executed; S6, real-time displacement monitoring is performed on the mechanical arm to obtain a real-time speed of the mechanical arm, and S7 is executed; S7, corresponding brake strategies are executed according to buffer point judgment and buffer interval judgment. The application can not only guarantee that the brake displacement has good control precision and stability, but also effectively suppress the brake pressure impact of the system.

The present invention relates to a fail-safe bypass valve assembly (1) for a pneumatic parking brake unit (120) of an electronically controllable pneumatic braking system (100), comprising: a first path (2) with an electromagnetic monostable valve (6); a second path (4) with a bistable valve unit (12); and a relay valve (10); wherein the first path (2) and the second path (4) receive a main parking brake pressure (pPA) from the pneumatic parking brake unit (120), wherein, at a first stable switching position of the bistable valve unit (12), the main parking brake pressure (pPA) is controlled at the relay valve control port (10.4) of the relay valve (10) independently of the switching position of the first monostable valve (6), and at a second stable switching position of the bistable valve unit (12), the relay valve control port (10.4) vents when the first monostable valve (6) is de-energized to vent at least one spring-loaded brake cylinder (125a, 125b).

The present application provides a vehicle redundant braking system, an electronic control unit thereof and a control method. The redundant braking system is coupled with a main braking system of a vehicle. The electronic control unit comprises a receiving module configured to receive a state signal indicative of a state of the main braking system and sensor signals indicative of a driver's input to a brake pedal and a vehicle speed condition; an activating module configured to activate a brake assist function of the redundant braking system when it is determined based on the state signal that the main braking system enters a mechanical backup state; and a brake assist module configured to determine to execute a corresponding one of a plurality of brake assist modes based on the sensor signals after the brake assist function is activated, wherein the plurality of brake assist modes comprises a standby mode, a first assist adjustable mode, a second assist adjustable mode, and a brake pressure maintaining mode.

The present invention relates to the technical field of vehicles, and disclosed are a parking brake control method and device, a vehicle, and a storage medium. The parking brake control method comprises the steps of: acquiring the gradient of a hill where a vehicle is located, and determining whether the gradient satisfies a preset gradient range; when the gradient is within the preset gradient range, determining the relationship between the traveling direction of the vehicle and the hill; when the traveling direction is uphill, acquiring a brake pressure of the vehicle, and determining the relationship between the brake pressure and a preset pressure; and when the brake pressure is greater than or equal to the preset pressure, controlling an EPB to switch to a first operating mode, and controlling the vehicle to trigger an HHC. According to the parking brake control method, the operating modes of the EPB and the HHC are determined by means of information about the hill where the vehicle is located and the brake pressure of the vehicle, so that two functions can cooperate with each other, thereby ensuring the smoothness of the vehicle during a hill start, and avoiding the problem that the whole vehicle slides on the hill.

The invention discloses a dual-mode redundancy brake-by-wire system, and relates to the technical field of vehicle braking and safety control. The dual-mode redundancy brake-by-wire system is characterized in that the oil outlet end of an oil supply pipeline is communicated with a first reversing valve; a control oil path of the driving pressure control mechanism comprises a first pressure control oil path and a second pressure control oil path, a proportional pressure reducing valve is arranged on the first pressure control oil path, and an oil outlet end of the first pressure control oil path is communicated to an oil inlet of a shuttle valve and is communicated to a corresponding driving brake through the shuttle valve; the second pressure control oil way is provided with an oil inlet pipeline and an oil drainage pipeline, an oil inlet switch valve is arranged on the oil inlet pipeline, an oil return switch valve is arranged on the oil drainage pipeline, and the oil inlet end of the oil drainage pipeline and the oil outlet end of the oil inlet pipeline are connected to the other oil inlet of the shuttle valve in parallel and communicated to the corresponding service brake through the shuttle valve. The device is used for braking and ABS sliding control under the working conditions of low attachment, heavy load and the like in an underground coal mine, and it is guaranteed that fault operation can be achieved, and safety and reliability are achieved.

The invention provides a vehicle comfortable braking control method and device, and relates to the technical field of vehicle comfortable braking control, and the method comprises the steps: initializing a comfortable braking function into a standby state after a whole vehicle is powered on, collecting environment perception data transmitted by an intelligent driving camera and a radar in real time, and dynamically determining a braking activation adjustment opportunity and an adjustment level; the pressure relief slope threshold value is calculated through road adhesion and vehicle speed accounting, the braking grade is dynamically adjusted in combination with road condition risks, braking parameters are calculated through multiple sensing signals, the braking pressure control quantity is generated to drive the integrated braking controller to act, the pressure relief speed of a pressure building cavity is precisely regulated and controlled, and the standby state is automatically recovered after a vehicle is static. A fixed braking parameter mode is abandoned, self-adaptive braking control is achieved in combination with the front road condition, the road surface condition and the driving state, parking pitching is effectively slowed down, braking safety and driving comfort are both considered, and various driving working conditions are adapted.

A driving dynamics system for a vehicle may include a primary control unit for detecting and / or generating steering commands and braking commands; a brake system having first and second electrohydraulic pressure supply units; four hydraulically actuatable wheel brakes of respective wheels; electrically actuatable brake pressure adjustment valves; and an electric steering actuator for actuating at least one axle. The driving dynamics system may implement a steering command during normal operation to actuate at least one of the pressure supply units and the steering actuator and / or, to implement a braking command during normal operation, to actuate at least the second pressure supply unit and at least the brake pressure adjustment valves for a wheel-specific pressure adjustment and, in a fault case, to actuate at least the first pressure supply unit and at least the brake pressure adjustment valves for a wheel-specific pressure adjustment.

The invention relates to a power reversing control system and method based on braking and exhaust butterfly valve braking, which are used for solving the problem of long reversing time caused by slow speed reduction of the whole tractor in the opening process of a clutch during reversing of a high-horsepower tractor. The control system collects switching signals of an ignition switch, advancing, retreating, a neutral gear, parking, a left brake, a right brake, a seat, a clutch pedal switch and the like and analog signals of system pressure, advancing clutch pressure, retreating clutch pressure, a clutch pedal, brake pressure, oil temperature and the like. Meanwhile, rotating speed signals such as clutch input rotating speed, clutch output rotating speed, vehicle speed and vehicle speed direction are collected, and signals such as engine actual rotating speed, engine torque and exhaust butterfly valve opening are received through a CAN bus; when power reversing occurs, a control algorithm is operated, and a brake clutch and an exhaust butterfly valve are adjusted according to control logic, so that the braking capacity of the whole vehicle is remarkably improved, the reversing time is shortened, and the working efficiency is improved.

The invention provides a vehicle braking control method and device, a storage medium, a vehicle controller and a vehicle. According to the vehicle braking control method provided by the invention, after a braking operation executed by a user for the vehicle is obtained, if it is judged that the operation condition of a comfortable braking function for the vehicle is met currently, the braking operation is executed; if yes, the comfortable braking function can be operated so as to determine the target braking pressure needed for braking control of the vehicle according to the preset braking pressure corresponding to the braking operation of the user, and due to the fact that the target braking pressure is smaller than the preset braking pressure, the accumulation speed of the braking pressure at the position of the vehicle can be reduced; the vehicle deceleration process is delayed, the smoothness of the vehicle braking process is improved, the vehicle part collision situation existing in the vehicle braking process is effectively relieved, the noise, vibration and sound vibration roughness indexes of the vehicle are improved, and the riding comfort of a user is guaranteed.