961results about "Application and release valves" patented technology

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.

The embodiments presented herein relate to a system and method for integrating electronic parking brake and service brakes to improve performance of spring brake requests at road speed. In one embodiment, a vehicle is provided comprising: a park brake; a service brake, a controller, and a valve. The controller is configured to: receive a request to apply the park brake while the vehicle is moving above a threshold speed; and in response to receiving the request, simultaneously attempt to apply both the parking brake and the service brake. The valve is configured to prevent simultaneous application of both the park brake and the service brake and allow only the service brake to be applied in response to the valve receiving sufficient pneumatic output to apply the service brake. Other embodiments are provided.

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 invention relates to the technical field of aircraft brake, in particular to an aircraft brake servo valve performance monitoring and health management method, which comprises the following steps of: acquiring a servo valve theoretical output current and a servo valve recovery current; according to the theoretical output current of each channel of the servo valve and the recovery current of the servo valve, whether brake current output loops of the two channels are abnormal or not is judged; when one channel of brake current output loop is abnormal, whether the other channel of brake current output loop is abnormal or not is judged according to the actual brake pressure and the theoretical pressure; and when the brake pressure output loop of the other channel is normal, brake control is carried out on the servo valve through the channel. By monitoring the performance of the servo valve in real time, it is guaranteed that dynamic switching can be achieved when the performance of the servo valve drifts in the airplane braking process, the influence of the performance drifting of the servo valve on the airplane braking effect is avoided, and the safety of a braking system is improved.

The invention relates to the technical field of loader brake valves, and discloses a hydraulic brake valve and a hydraulic system thereof.The hydraulic brake valve comprises the hydraulic brake valve, the hydraulic brake valve is composed of a one-way valve, a brake valve set, a brake lamp pressure switch, a low-pressure alarm pressure switch, a shuttle valve, a high-low pressure unloading valve and a throttling hole, and the high-low pressure unloading valve and the throttling hole are integrated; a P port, an A port, a B port, a T port, an LS1 port, an LS port, a low-pressure alarm pressure switch and a brake lamp pressure switch are arranged outside the hydraulic brake valve. A liquid filling valve is omitted, an oil source of the full-hydraulic power braking system is taken from an existing priority valve CF port of equipment, pressure feedback signals are selected through a shuttle valve on a hydraulic braking valve, the pressure feedback signals are transmitted to the priority valve, and liquid filling and energy supplementing of the full-hydraulic power braking system or steering work of a steering system is achieved. The brake has the remarkable advantages of being fast in brake response, low in noise, low in failure rate, high in safety coefficient, compact in structure, low in cost and low in energy consumption.

The present invention discloses a hydraulic brake valve and its exhaust process method. The valve body of the exhaust structure touches and presses the operating mechanism at the top of the valve body component of the valve body. A working spring is installed on the valve plug of the valve body. The valve core is installed in the central hole of the valve body and the central counterbore of the plug. The valve core is inserted into the center of the plug, and the counterbore presses the return spring. The return spring is installed on the spring seat, and the spring seat is installed in the counterbore of the plug. The roller of the operating mechanism touches and presses the plug in the valve body to form action and reaction forces, and promotes the operating mechanism and the valve core to touch and press and move to work. The valve core can slide along the inner wall of the valve body. An exhaust hole is provided on the side wall of the valve core. A plug for blocking the other end of the valve body is provided in the valve body, and a spring seat abutting against the plug is further provided in the plug. A return spring is installed between the spring seat and the valve core. The advantages are: avoiding abnormal noises and cavitation phenomena caused by gas accumulation to the hydraulic brake valve, ensuring the normal transmission and circulation of hydraulic oil in the pipeline, and eliminating potential hazards of the hydraulic braking system.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The present invention obtains a hydraulic pressure control unit capable of accurately evaluating viscosity of a hydraulic fluid.The hydraulic pressure control unit according to the present invention includes a controller including an evaluation section that evaluates the viscosity of the hydraulic fluid. The evaluation section evaluates the viscosity on the basis of a reduced amount of a current value of a current flowing through a wire (314) at a time when the current value is temporarily reduced in a process in which the current value is increased toward a target current value at beginning of application of the current to the wire (314) of an electromagnetic valve (31).

The invention discloses a pressure-limiting valve seat, a pressure-limiting valve assembly, a valve group module and an air braking system. The pressure-limiting valve seat comprises a valve seat base body, and the valve seat base body is provided with a first valve cavity, a second valve cavity and a third valve cavity which are independent of one another; the brake cylinder interface and the sensing valve lower cavity interface are communicated with the first valve cavity, the pressure reduction air cylinder interface and the sensing valve upper cavity interface are communicated with the second valve cavity, and the control valve interface is communicated with the third valve cavity; the valve seat base body is further provided with a pressure limiting valve connector used for being connected with a pressure limiting valve, and the pressure limiting valve connector communicates with the first valve cavity, the second valve cavity and the third valve cavity in a one-to-one correspondence mode. The brake cylinder connector, the sensing valve lower cavity connector and one of the pressure limiting valve connectors communicate with the first valve cavity, so that when a corresponding valve port of the pressure limiting valve communicates with the pressure limiting valve connector, the pressure limiting valve can communicate with the brake cylinder connector and the sensing valve lower cavity connector at the same time through the first valve cavity; therefore, the pressure limiting valve can be communicated with the brake cylinder and the sensing valve lower cavity of the sensing valve at the same time.

The invention relates to the field of tire type walking equipment, and discloses a load-sensitive hydraulic brake valve and a load-sensitive hydraulic system thereof, and the load-sensitive hydraulic system comprises the load-sensitive hydraulic brake valve, a load-sensitive pump, a priority valve, a steering hydraulic system, a working hydraulic system, a shuttle valve and corresponding connecting pipelines; a P port, an A port, a B port, a T port, an LS1 port, an LS port, a low-pressure alarm pressure switch and a brake lamp pressure switch are arranged outside the load-sensitive hydraulic brake valve. According to the system, full-hydraulic dynamic braking can be achieved on equipment without a prefill valve, the equipment efficiency is improved, the installation cost is reduced, the energy consumption is reduced, and the service life is prolonged. Wherein the load-sensitive hydraulic brake valve integrates a brake function, a pressure maintaining function, a high-low pressure switching function, a pressure signal selection function and a pressure alarm function; the invention has the advantages of fast braking response, low noise, low failure rate, high safety coefficient, compact structure, low cost, low energy consumption and long service life.

A brake valve (10) for providing a brake pressure (pB) to a vehicle brake system (100) includes a housing (20), a pressure piece (16), configured to apply a force to a valve system (18) and slidably arranged in the housing (20) along a valve axis (22) between a neutral position and an actuation position, and a magnet (42) forming a moving part (40) of a position sensor (38) for detecting the position of the pressure piece (16). The magnet (42) is attached to the pressure piece (16) by a magnet support (64), and the magnet support (64) includes a saddle portion (68). The saddle portion (68) is detachably connected to the pressure piece (16).

The utility model relates to a valve device for a vehicle electronic brake system and the vehicle electronic brake system. The valve device comprises a shell; an actuation assembly having a push rod; a first piston; a first spacer in which a pilot chamber in the housing is in fluid communication with a brake pedal side of a brake circuit of the vehicle electronic brake system; a second spacer having a control chamber in fluid communication with a brake side of the brake circuit and a high pressure chamber in fluid communication with a high pressure source side of the brake circuit; a relay valve comprising a second piston, in an unactivated valve position in which the push rod retracts and the second piston abuts against the second spacer to isolate the high pressure chamber from the control chamber, and in a working valve position in which the actuation assembly extends and urges the first piston through the second spacer to urge the second piston to fluidly communicate the high pressure chamber with the control chamber, high-pressure gas from the high-pressure gas source side enters the brake side through the high-pressure cavity and the control cavity so as to be used for generating brake pressure. According to the valve device and system, the risk that the electromagnetic valve fails is reduced.

A valve assembly for a pneumatic system of a vehicle, in particular a commercial vehicle, including: an outlet valve assembly for venting the pneumatic system, a control device for operating the valve assembly in order to admit and release air to and from a pneumatic actuator, wherein the control device is configured to output, to the outlet valve assembly, a switching signal for switching the outlet valve assembly, and, via the switching signal, the outlet valve assembly can be switched to a noise-reducing first venting mode or a quick-venting second venting mode.

The invention relates to a method for operating a pneumatic braking device 1 for vehicles 2 with pneumatic brakes 4, which can be actuated by means of brake pressure P and are vented via an outlet valve 13. In order to reduce the noise emission of the vehicle with pneumatic brakes when bleeding the brakes, it is provided that a brake control unit 11 controls the outlet valve 13 according to a bleeding gradient EG, wherein the brake control unit 11, taking into account the current vehicle control commands 38, selects 26 from at least two operating modes 29, 30, 31 with different bleeding gradients EG1, EG2, EG3 and controls the outlet valve 13 in a normal operation 29 according to bleeding gradients EG1 which are optimized with regard to reduced noise emission during bleeding, and controls the outlet valve 13 in a rapid bleeding mode 30 according to bleeding gradients EG2 optimized for rapid bleeding.

A valve unit for an anti-lock braking system has a valve body, a piston, and an elastic element acting on the piston. The valve body has an outlet port, an inlet port, a primary chamber communicating with the outlet port, an expansion chamber with an outflow passage establishing fluid communication between the primary chamber and the expansion chamber, and a bypass passage between the inlet port and the outlet port. The piston is movable in the primary chamber and has a longitudinal through cavity, a first transversal surface facing the outlet port, and a second transversal surface facing away from the outlet port. The first transversal surface has an area smaller than the area of the second transversal surface. The elastic element exerts an elastic force to move the piston away from the outlet port. The valve unit is activatable by pressure of a brake fluid in the primary chamber.

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.

A power transmission unit of a single-acting plunger type includes a ball screw, a ball nut driven by the ball screw, and a plunger piston coupled to the ball nut. A block housing at least partially encloses the plunger piston and the ball screw. A plunger chamber is at least partially defined by the block housing and a face of the plunger piston. The plunger chamber is selectively pressurized by reciprocal motion of the plunger piston with respect to the block housing driven by longitudinal motion of the ball nut. An electric motor selectively drives the ball screw to responsively reciprocate the plunger piston within the plunger chamber. A motor housing at least partially encloses the ball nut, the electric motor, and the plunger piston. The motor housing includes a block lip which is crimped to the block housing to maintain the motor housing in relation to the block housing.

The invention relates to a control valve, a liquid storage assembly, a suspension system, a braking system and a vehicle, the control valve comprises a valve body and a valve element, the valve body is provided with a first air vent and an exhaust hole, the first air vent is suitable for being connected with a liquid storage pot, and the exhaust hole is suitable for being communicated with the outside; at least part of the valve element is movably arranged in the valve body. When the valve element is located at the first position, the first ventilation opening is communicated with the exhaust hole, and when the valve element is located at the second position, the first ventilation opening is separated from the exhaust hole. Controllable opening and closing of the exhaust channel of the liquid storage pot are achieved by actively controlling the position of the valve element, oil leakage and impurity entering caused by passive opening of the exhaust channel are avoided, and stable operation of a system is guaranteed.

The utility model relates to the field of vehicle braking, and discloses a four-loop protection valve which comprises a middle main valve body, the upper portion of the main valve body is connected and provided with a first protection valve, the lower portion of the main valve body is connected and provided with a second protection valve, and the main valve body is provided with an air inlet, a first air outlet, a second air outlet, a third air outlet and a fourth air outlet; a cavity is formed in the main valve body and communicated with the air inlet, a first channel and a second channel are arranged in the cavity, the air outlet end of the first protection valve is communicated with the first air outlet and the second air outlet, and the air outlet end of the second protection valve is communicated with the third air outlet and the fourth air outlet. The air outlet end of the first protection valve is communicated with the first channel through one-way valve control, the first channel and the second channel are connected and controlled through the pressure limiting valve, the second channel is connected with the air inlet end of the second protection valve, and the air outlet end of the second protection valve is communicated with the third air outlet and the fourth air outlet. The device can be used independently, and has the advantages of few parts, convenience in assembly and the like.

A redundant parking brake apparatus is provided for a vehicle having components of a parking brake system. The redundant parking brake apparatus comprises a first parking brake controller arranged to (i) monitor a first signal indicative of a request to apply parking brakes of the vehicle, and (ii) provide one or more control signals to be applied to components of the parking brake system to apply the parking brakes in response to receiving the first signal. The redundant parking brake apparatus also comprises a second parking brake controller arranged to (i) initiate a timer counter in response to receiving the first signal, and (ii) provide one or more control signals to be applied to components of the parking brake system to apply the parking brakes when the timer counter has reached a predetermined count.

A hydraulic brake system for activating the wheel brakes of an aircraft landing gear assembly includes a hydraulic fluid supply line and an associated return line. There is a valve which separates a source of hydraulic fluid from a portion of the return line and an associated leak path associated with the valve that in use maintains the pressure and / or volume of hydraulic fluid in the portion of the return line above a minimum acceptable level. The leak path may be provided by a hole drilled in a part (e.g. the poppet) of a non-return check valve.

The invention discloses a vehicle chassis domain controller and a vehicle, the controller comprises at least one single-chip microcomputer, a brake system solenoid valve driving module and a shock absorber solenoid coil driving module, the output end of the single-chip microcomputer is connected to a brake system solenoid valve through the brake system solenoid valve driving module, and the output end of the single-chip microcomputer is connected to a shock absorber solenoid coil driving module through the shock absorber solenoid coil driving module. The output end of the single-chip microcomputer is connected to a shock absorber through a shock absorber electromagnetic coil driving module. The braking system electromagnetic valve driving module is used for driving a braking system electromagnetic valve to adjust the braking pressure of wheels; and the shock absorber electromagnetic coil driving module is used for controlling the target current of the vehicle shock absorber electromagnetic coil so as to adjust the damping force of the electric control shock absorber. The electric control shock absorber system has the advantages that the electric control shock absorption function and the electric control brake function of a vehicle are integrated in one domain controller, so that the manufacturing cost of the whole vehicle is reduced, the performance of the electric control shock absorber system is improved, and meanwhile the original functions of the two systems are not affected.

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 present disclosure provides an emergency valve, including: a valve body (10) comprising an emergency cavity (11), a pressure increasing cavity (12) and an inflation cavity (13) which are spaced apart from one another, wherein an extension direction of the pressure increasing cavity (12) is the same as an extension direction of the inflation cavity (13); an air inlet of the emergency cavity (11) is in communication with a train pipe (71); the pressure increasing cavity (12) is provided with a first communication port, a second communication port and a relief port; the relief port of the pressure increasing cavity (12) is located between the first communication port of the pressure increasing cavity (12) and the second communication port of the pressure increasing cavity (12); the first communication port of the pressure increasing cavity (12) is in communication with a brake cylinder (72); and the second communication port of the pressure increasing cavity (12) is in communication with the emergency cavity (11). The device increases the inflation speed of the train pipe, and achieves the aim of saving energy by utilizing the pressurized air in the brake cylinder.

The invention relates to the technical field of vehicle control, in particular to a braking friction coefficient self-learning method and device, a vehicle and a storage medium. The method comprises the following steps: obtaining bench test data of a vehicle, and establishing a preset braking temperature model by using a CAE technology based on the bench test data; actual driving information of the vehicle is obtained, and the current braking friction pair temperature is determined based on a preset braking temperature model and the actual driving information; and determining the current brake friction coefficient according to the current brake friction pair temperature. Therefore, by accurately acquiring the real-time temperature of the braking system before braking and matching the accurate braking friction coefficient according to the temperature, the calculated braking torque can be closer to the actual torque, and the problems that in the braking process, due to temperature rise, the feeling of a brake pedal is different, and deceleration output is affected are solved; therefore, the braking performance is optimized, and the stable and reliable speed reduction effect of the vehicle under various working conditions is ensured.

An air control valve, including a main valve body, a main valve cavity communicates with an auxiliary air cylinder, an air inlet channel communicates with a train pipe, the air inlet channel communicates with the main valve cavity, and an air exhaust channel communicates with the main valve cavity; a sliding valve, which attaches to the main valve cavity, a communicating channel communicates with the air inlet channel, the communicating channel communicates with the air exhaust channel, a brake inflation channel communicates with the main valve cavity, and the brake inflation channel communicates with a brake cylinder; and a shut-off valve, a shut-off valve body is provided with a shut-off valve cavity, a shut-off valve core is disposed in a driving cavity and separates the driving cavity into an auxiliary air cavity and a brake cavity, the auxiliary air cavity communicates with the auxiliary air cylinder, the brake cavity communicates with the brake cylinder, the air exhaust cavity communicates with the air exhaust channel, and the shut-off valve core has an air outlet position for communicating an air inlet of the air exhaust cavity with an air outlet of the air exhaust cavity and a closing position for separating the air inlet of the air exhaust cavity from the air outlet of the air exhaust cavity.

Coupling device for connecting a brake input element (16) to a master brake cylinder (10) of a vehicle, comprising: an input piston (14) which can be arranged on the brake input element (16) in such a way that the input piston (14) can be adjusted by a braking distance (s) from an initial position (s0) upon actuation of the brake input element (16); and an output piston (12) to which a driver braking force (Ff) exerted on the brake input element (16) can be transmitted via the input piston (14) which is adjusted from its initial position (s0) by a braking distance (s) of at least a predetermined first minimum braking distance, and which can be arranged on the master brake cylinder (10) in such a way that an internal pressure in the master brake cylinder (10) can be increased by means of the driver braking force (Ff) transmitted to the output piston (12) via the input piston (14); wherein, at least in a first operating mode of the coupling device, the input piston (14) adjusted from its initial position (s0) by a braking distance (s) smaller than the first minimum braking distance is spaced from the output piston (12) in such a way that a force transmission from the input piston (14) to the output piston (12) is prevented; wherein the coupling device can additionally be converted into at least one second operating mode with a second minimum braking distance less than the first minimum braking distance, wherein in the second operating mode of the coupling device the input piston (14), which is adjusted from its initial position (s0) by a braking distance (s) less than the second minimum braking distance, is spaced from the output piston (12) in such a way that force transmission from the input piston (14) to the output piston (12) is prevented, and the driver braking force (Ff) can be transmitted to the output piston (12) via the input piston (14), which is adjusted from its initial position (s0) by a braking distance (s) between the second minimum braking distance and the first minimum braking distance; and wherein the coupling device comprises a control device (50) by means of which the coupling device can be transferred from at least the first operating mode with the first minimum braking distance into at least the second operating mode with the second minimum braking distance smaller than the first minimum braking distance; characterized in that the coupling device comprises an adjustable force transmission component (52) attached to either the output piston (12) or the input piston (14), and the control device (50) is additionally designed to control an actuator of the power transmission component (52) by means of a control signal (54) such that the power transmission component (52) is transferred from a retracted position of the first operating mode into at least one extended position of at least the second operating mode.

A brake modulator (1) for providing an ABS brake function to a vehicle (200) includes a main body (17), a first ABS valve unit (47) configured to provide a first brake pressure (pB1) and a second ABS valve unit (53) configured to provide a second brake pressure (pB2), and a main cover (19) for closing of an assembly side (27) of the main body (17). The cover portions (127, 131, 133, 135) for covering corresponding valve cavities (33, 35, 37, 39) are formed separately from a main cover plate (20) of the main cover (19). A relay valve cover plate (137) is formed integrally with or separately from the main cover plate (20). The present disclosure further relates to a commercial vehicle (202) and to an assembly method (300) for a brake modulator (1).

An electronically controlled pneumatic parking brake system (305) for a vehicle (100) is described, comprising a control device (300) that generates electronic signals to apply and release the parking brake (360). This system utilizes an air supply source (230) and two electropneumatic valves (210, 220) for brake operation. The first valve (210) releases the brake by admitting pressurized air into a control chamber (260) upon receiving a release signal, whereas the second valve (220) activates the brake by venting air to atmosphere upon receiving an actuation signal. The control device (300) is also capable of detecting malfunctions in these valves and can perform a recovery function to heat the valves (210, 220) to restore their function.After recovery, the controller uses a PWM signal generator (301) to repeatedly apply and release the brake by alternately operating the valves (210, 220).