644 results about "Wheel cylinder" patented technology

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.

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.

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 brake system including: a first hydraulic pressure supplier connected to a wheel cylinder; a second hydraulic pressure supplier connected to the wheel cylinder; a first controller configured to control the first hydraulic pressure supplier to provide a first hydraulic pressure to the wheel cylinder; and a second controller configured to control the second hydraulic pressure supplier to provide a second hydraulic pressure to the wheel cylinder. The first controller may be connected to a first power source and a wheel speed sensor, and supply first current of the first power source to the wheel speed sensor via the second controller. The second controller may be connected to a second power source and the wheel speed sensor, and allow or block the first current of the first power source to the wheel speed sensor and allow or block second current of the second power source to the wheel speed sensor.

The present disclosure relates to an electronic brake system and an operation method thereof. The electronic brake system includes a reservoir in which a fluid is stored, a hydraulic pressure supply device configured to generate a hydraulic pressure by operating a hydraulic piston in response to a signal from a pedal displacement sensor detecting a displacement of a brake pedal, a hydraulic control unit including a first hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a first hydraulic circuit including two wheel cylinders, and a second hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a second hydraulic circuit including other two wheel cylinders.

A vehicle braking device includes: an electric cylinder in which a piston driven by an electric motor slides in a cylinder to supply fluid; a hydraulic pressure output unit connected to the electric cylinder by way of a first liquid passage, the hydraulic pressure output unit pressurizing or depressurizing a hydraulic pressure in the first liquid passage and outputting the hydraulic pressure to a supply liquid passage connected to a first wheel cylinder; and a control unit that causes at least one of the electric cylinder and the hydraulic pressure output unit to generate the hydraulic pressure in the first wheel cylinder according to a relative position between the piston and the cylinder.

A electric brake system includes a main device that provides a first hydraulic pressure to a plurality of wheel cylinders respectively installed on a plurality of wheels, based on a position of a brake pedal; and art auxiliary device that provides a second hydraulic pressure to first and second wheel cylinders respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal in a state in which the main device does not generate the first hydraulic pressure. The auxiliary device receives power from a power network different from that of the main device, and the auxiliary device controls at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels. In such an electric brake system, when the main device fails or is out of control, the auxiliary device may auxiliary generate the hydraulic pressure required for braking and may generate braking force using the parking brake.

The invention provides a hydraulic integrated brake-by-wire system, and belongs to the field of automobile brake systems, the hydraulic integrated brake-by-wire system comprises a main cylinder, a first piston, a second piston, a first oil can, a second oil can and an energy accumulator, the first piston and the second piston divide an inner cavity of the main cylinder into a first cavity, a second cavity and a third cavity, and the end, away from the main cylinder, of the first piston is connected with a pedal; a first loop and a second loop are connected between the second cavity and the wheel cylinder set, a third loop is connected between the first cavity and the wheel cylinder set, an oil pump is connected to the first loop in series, the energy accumulator is located between the oil pump and the second cavity, the first oil can is communicated with the first cavity through a pipeline, and the second oil can is communicated with the second cavity and the wheel cylinder set through pipelines. And the first oil pot and the second oil pot are mutually independent. The problem that an existing electronic hydraulic braking system is limited in redundancy capacity is solved. The method has the technical effects that reliable voltage buildup with higher power and higher braking response speed are realized, and the braking effect of redundant braking is ensured while braking decoupling is realized.

The invention discloses a driving and braking suspension cooperative control method, device and equipment, a medium and a product, and relates to the field of vehicle active safety control. The method comprises the steps that a driving demand analysis and decision module determines driver demand torque, a control mode and a neutral steering target according to the vehicle state, the steering angle of a steering wheel of a driver and input information of a driving / braking pedal; the hybrid coordination control module determines front and rear motor torques according to the torque required by a driver and the vehicle state under the conventional working condition, and determines four-wheel cylinder brake pressure by using sliding mode control according to the vehicle state; the torque vector optimization distribution control and Smith predictor control method is adopted to determine the torque of a front motor, the torque of a rear motor and the brake pressure of a four-wheel cylinder according to the torque required by a driver, the vehicle state and a neutral steering target under the limiting working condition, and the weighted pseudo-inverse distribution vehicle body posture coordination control is adopted to determine the damping force of the semi-active suspension. The method can achieve the precise tracking of the expected neutral steering target, and gives full play to the lateral movement limit of the vehicle.

A braking control device includes a pressure adjustment unit that adjusts a wheel pressure Pw of a wheel cylinder by a servo pressure Pu generated using an electric motor as a power source, a solenoid valve provided in a hydraulic pressure transmission path from the servo pressure Pu to the wheel pressure Pw, and a controller that controls the pressure adjustment unit. The controller calculates a pressure loss Pd in the solenoid valve based on an instruction pressure Ps calculated from a braking request amount Bs and the wheel pressure Pw. Then, the controller determines a target pressure Pt by adding the pressure loss Pd to the instruction pressure Ps, and controls the pressure adjustment unit based on the target pressure Pt.

The embodiment of the invention provides a vehicle braking control method and device.The vehicle braking control method comprises the steps that vehicle operation parameters of a running vehicle are obtained and subjected to weighted fusion processing, and a dynamic working condition index is generated; acquiring a real-time driving signal of a current driver in a sliding window at preset time and importing the real-time driving signal into a preset driving intention prediction model to generate a driving intention type; according to the dynamic working condition index and the driving intention type, the braking force demand level of each wheel cylinder is determined; and the brake oil quantity of each wheel cylinder is adjusted based on the brake force demand level so as to adjust the brake condition of the vehicle, and the brake oil quantity of each wheel cylinder is corrected in real time according to the obtained feedback signal. According to the method, accurate matching of brake pressure distribution and vehicle dynamic characteristics can be achieved, front and rear shaft brake torque distribution is effectively balanced under the curve brake working condition, the response time from driving intention recognition to pressure adjustment execution is shortened, and the coordination control capacity of a brake system is improved under the sudden avoidance scene.

The utility model discloses a steel cord stranding machine spool fast locking device which comprises a rotating shaft, a locking shaft is coaxially arranged at one end of the rotating shaft, the diameter of the locking shaft is smaller than that of the rotating shaft, and an inner abutting sleeve is arranged on the locking shaft. The maximum diameter of the inner abutting sleeve is consistent with the diameter of the rotating shaft, the inner abutting sleeve and the rotating shaft are jointly supported in a wheel cylinder of the spool, a first circular ring is arranged at the end, away from the rotating shaft, of the inner abutting sleeve, an inserting piece is arranged on the first circular ring, one end of the inserting piece is inserted into a pin hole in a spool disc, and the other end of the inserting piece is inserted into a pin hole in the spool disc. And a limiting mechanism for limiting the axial movement of the inner abutting sleeve on the locking shaft is arranged at one end, far away from the rotating shaft, of the inner abutting sleeve. According to the spool locking device, the spool can be stably locked, the dismounting is fast, the time consumed for mounting and replacing the spool is effectively shortened, and the production efficiency is improved.

The hydraulic power-assisted braking system comprises a container, a brake cylinder, a brake part, a brake master cylinder, a power-assisted assembly and a sensor, the container is used for storing hydraulic fluid, and the brake cylinder is used for braking wheels; the brake master cylinder is connected between the container and the brake cylinder, and the brake part is connected with the brake master cylinder and used for driving the brake master cylinder to act so as to achieve brake driving of the brake cylinder. The boosting assembly is connected between the container and the brake cylinder, and the boosting assembly is used for increasing the pressure intensity of hydraulic fluid conveyed to the brake cylinder during starting so as to realize braking boosting; the sensor is arranged on at least one of the brake part, the brake master cylinder and the power assisting assembly. According to the hydraulic power-assisted braking system, the problems that in the prior art, pedal force and pedal stroke are large, pressure buildup at the front section of braking is not timely, braking response is delayed and the like are solved, space arrangement is more flexible, and installation and arrangement in a narrow space are facilitated.

A brake apparatus for a vehicle includes a drum configured to rotate together with a wheel of the vehicle, a pair of brake shoes to which linings for rubbing against a friction surface on an inner circumferential side of the drum are attached, and a wheel cylinder disposed to contact one end of each of the pair of brake shoes and configured to operate the pair of brake shoes outwardly by receiving braking hydraulic pressure, and the drum has an air flow path allowing air flow formed inside the friction surface such that the lining and the friction surface are separated by the air flow.

The invention provides a desktop-level hardware-in-the-loop test system building method, device and equipment, and relates to the technical field of hardware-in-the-loop simulation, and the method comprises the steps: configuring a vehicle network simulation and vehicle dynamics model in an upper computer with a CAN development environment and vehicle dynamics simulation software, a real-time data channel between the two is established through a full duplex transmission protocol; a driver instruction is generated through the driving control panel, and a vehicle state signal is generated through vehicle dynamics software; the wheel speed in the vehicle state signal is converted into a physical excitation signal, and a wheel cylinder pressure signal returned by the controller is collected; the pressure signal is fed back to the vehicle dynamics model to form a closed loop, a test scene is executed, and the desktop-level hardware-in-loop test of the brake controller is completed. By using vehicle dynamics simulation software, the test confidence coefficient is improved; data exchange is carried out by utilizing an FDX protocol of a CAN development environment, and complexity and potential risks of self-development of a communication interface are avoided.

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

Proposed is an electro-hydraulic brake device including a main brake unit configured to provide a braking fluid to a plurality of wheel cylinders by driving a motor, a storage unit connected to the main brake unit, and configured to store the braking fluid, an auxiliary brake unit configured to provide the braking fluid to one or more of the wheel cylinders when an operational failure of the main brake unit occurs, and configured to divide a hydraulic line of a hydraulic circuit unit physically by a function, wherein the hydraulic circuit unit disposed at a block unit is connected to the main brake unit and the storage unit.

A braking apparatus includes a pedal part pressurized for braking by a driver, a master cylinder part in which pressure of oil is amplified by the pedal part, a block part connected to the master cylinder part, supplied with the oil, and configured to amplify the pressure of the oil as an electric pump is driven by power applied thereto, a wheel cylinder part connected to the block part and configured to provide a braking force to a wheel, and a variable valve part mounted on the block part and configured to adjust the flow amount of oil based on a flow rate of the oil that is discharged by the electric pump.

The invention discloses a heavy-duty vehicle electric wheel structure and a using method thereof, and belongs to the technical field of electric vehicle drive.The heavy-duty vehicle electric wheel structure comprises a rim, a planetary reducer and a drum brake are connected to the inner surface of the rim, a cavity is formed in the drum brake, and a hub motor is installed in the cavity; the hub motor is connected with the planetary reducer through a motor shaft, the planetary reducer comprises a sun gear, a planet gear, a gear ring and a planetary reducer shell which are sequentially connected, the sun gear is connected with the motor shaft, the planetary reducer shell is connected with the rim, and a motor shell, a motor outer end cover and a motor inner end cover are arranged on the outer side of the hub motor. The two sides of the motor shell are connected with the motor outer end cover and the motor inner end cover respectively, the drum brake comprises a brake drum, a brake shoe and a brake wheel cylinder which are connected in sequence, the brake wheel cylinder is connected with the motor inner end cover, the brake drum is connected with the rim, the motor shell is connected with the brake drum, the design and assembly processes of independent components are reduced, and therefore the manufacturing cost is reduced.

This specification discloses a hydraulic brake circuit fault diagnosis method based on the OneBox wire control brake system, including four parts: electric cylinder circuit fault diagnosis, master cylinder and simulator brake circuit fault diagnosis, PSV fault diagnosis, and CSV fault diagnosis. The embodiment of this specification detects brake system circuit faults through four diagnostic processes, uses pressure sensors and electric cylinder units to achieve pressure detection and pressure increase and decrease control, realizes pressure building function diagnosis, valve, hydraulic cylinder, wheel cylinder leakage performance diagnosis; valve, electric power unit jam fault diagnosis, can quickly and comprehensively detect the boost isolation valve, master cylinder isolation valve, simulation valve, pedal simulator, isolation valve and wheel cylinder with high accuracy.

A vehicle braking system includes a master cylinder having a pedal feel simulator incorporated therein, a reservoir configured to retain a volume of unpressurized brake fluid for use in the vehicle braking system, a wheel cylinder coupled to the master cylinder via a first braking circuit, an electronically-controlled pressure generating unit configured to move fluid through the first braking circuit to the wheel cylinder in a first mode of operation, and a two-way valve positioned in the first braking circuit and configured to selectively decouple the master cylinder from the wheel cylinder. In the first mode of operation, the master cylinder is decoupled from the wheel cylinder via the two-way valve and the master cylinder is coupled to the reservoir via the two-way valve. In a second mode of operation, the master cylinder is coupled to the wheel cylinder via the two-way valve.

A brake apparatus for a vehicle, comprising: a 3-way solenoid valve unit including one or more 3-way solenoid valves, a valve block having a first surface on which the 3-way solenoid valve unit is installed, at least one accumulator, a pressurizing unit, and a plurality of wheel cylinders, wherein each 3-way solenoid valve includes a first port, a second port, a third port, a first opening / closing flow path, and a second opening / closing flow path, and at least a part of the at least one accumulator is disposed between the 3-way solenoid valve unit and a second surface of the valve block.

The invention provides a brake disc rust removal method and system, electronic equipment and a medium, and relates to the technical field of vehicle safety control, and the brake disc rust removal method comprises the following steps: after a vehicle finishes a rust removal function for one time, obtaining the driving mileage of the vehicle in a preset time period, and setting a time trigger threshold value according to the driving mileage; setting a mileage trigger threshold by combining the driving mileage and the opening times and the opening duration of the windscreen wiper in a preset time period; and if the driving distance of the vehicle reaches the mileage triggering threshold value, the passing time reaches the time triggering threshold value and the wheel cylinder pressure is lower than the preset pressure value, the rust removal function is automatically started to conduct passive rust removal on the brake disc. The problem that in the prior art, the vehicle kinetic energy recovery efficiency is reduced due to the scheme that hydraulic braking is adopted for brake disc rust removal regularly is solved.

To inhibit vibration of a vehicle body caused by operation of a pump.SOLUTION: A brake system 20 includes a brake pipe 50 which is connected to a brake actuator 40 and a friction brake 30 and in which a brake fluid discharged from a pump 42 of the brake actuator 40 flows. The brake pipe 50 has: a metal pipe 51 connected to the brake actuator 40; and a flexible hose 55 for guiding the brake fluid flowing in the metal pipe 51 to a wheel cylinder 31 of the friction brake 30. A processing circuit 71 of a brake control device 70 increases the rotation number of an electric motor 41 serving as a power source of the pump 42 as a time period that a temperature of the flexible hose 55 is high becomes longer based on heat history of the flexible hose 55.SELECTED DRAWING: Figure 1

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.

The invention relates to an electronic control steering method and system for a vehicle. The vehicle comprises an electric control steering system, the electric control steering system comprises a hydraulic control system, steering knuckle arms arranged at all steering wheels and hydraulic wheel cylinders connected with all the steering knuckle arms through piston rods, and the method comprises the steps that steering parameters are received, the steering parameters comprise a steering input torque, a steering input angle, a vehicle speed, a transverse acceleration of the vehicle and actual piston positions of pistons of all hydraulic wheel cylinders; based on the steering parameters, determining a target steering radius of the vehicle and a target piston position of a piston of each hydraulic wheel cylinder; and based on the determined target piston position, the hydraulic control system is controlled to change the hydraulic pressure in each hydraulic wheel cylinder so as to change the position of the piston, so that the steering knuckle arms connected with the piston rods are driven by the piston rods to enable the corresponding steering wheels to deflect for steering.

The invention discloses an unmanned mine car slip rate control method based on superhelix second-order sliding mode control. The method comprises the following steps: deriving a second-order slip rate system kinetic equation based on a wheel kinetic model; introducing a steepest differential tracker to carry out slip rate differential estimation; converting the second-order slip rate kinetic equation into an error variable form for expression; designing a non-singular sliding mode surface according to a fixed time convergence theorem, and calculating the control rate of second-order sliding mode control based on a superhelix algorithm: issuing a braking torque control signal to a hydraulic braking control unit of the unmanned mine car, and further adjusting the braking pressure of a wheel cylinder. The method has the advantages that the actual slip rate of the wheels is controlled to be close to the target slip rate, the locking phenomenon is prevented when the mine car is braked, and the braking efficiency and safety of the mine car are improved.

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

A vehicle brake system includes: a plurality of wheel cylinders, a main pressure building module, a redundant pressure building module and a brake master cylinder assembly; the main pressure building module is separately connected to the plurality of wheel cylinders and is used for conveying a brake fluid to the plurality of wheel cylinders; the redundant pressure building module is connected to at least one wheel cylinder and is used for conveying the brake fluid to the at least one wheel cylinder; and the brake master cylinder assembly is separately connected to the plurality of wheel cylinders and is used for conveying the brake fluid to the plurality of wheel cylinders. Further disclosed is a vehicle.

The brake device may comprise: a hydraulic pressure supply unit fluidically connected to wheel cylinders of a vehicle; a parking brake arranged at at least one of the wheel cylinders; a first processor electrically connected to the hydraulic pressure supply unit and the parking brake; and a second processor electrically connected to the parking brake, and electrically connected to the first processor through a signal line. The first processor can control the hydraulic pressure supply unit on the basis of output signals of a pedal sensor of the vehicle, control the parking brake on the basis of output signals of a parking switch of the vehicle, and provide periodic signals to the second processor through the signal line. The second processor can control the parking brake on the basis of the output signals of the pedal sensor if the periodic signals of the first processor are not received.