164 results about "Hydropneumatic suspension" patented technology

The invention relates to a leveling method and a leveling device for a hydro-pneumatic suspension of a multi-axle vehicle. The leveling device comprises an oil tank, an oil pump, a public accumulator, wheels and a hydro-pneumatic spring component. According to the leveling device, a suspension of a two-axle or multi-axle vehicle is converted into three-point support through the coupling mode of hydro-pneumatic springs, and the vehicle-mounted platform leveling mode based on three-point control is realized. The leveling device also comprises a control panel, a microprocessor, at least three oil charge and discharge control valves connected with an oil liquid pipeline and electrically connected with the microprocessor, a coupling valve connected with the oil liquid pipeline and electrically connected with the microprocessor, an altitude sensor arranged between a cross arm of each suspension and a vehicle body, and a tilt angle sensor fixedly arranged on the vehicle body, wherein the altitude sensor and the tilt angle sensor are electrically connected with the microprocessor through signal wires, and the microprocessor consists of a solver and a controller.

A vehicle body inclination angle regulating unit (17) includes a balancing oil cylinder (10). One chamber of the balancing oil cylinder (10) is connected with an oil tank (5) and an oil source for leveling operation via a first one-way damper valve (8) and an electric controlled switch valve (7), and the other chamber of the balancing oil cylinder (10) is connected with a non-rod chamber of a suspension oil cylinder via an electric controlled shutoff valve (14) and a second one-way damper valve (9). In addition, an automatically-leveling hydropneumatic suspension mechanism includes at least two pairs of suspension oil cylinders (12), vehicle body inclination angle regulating units (17), a vehicle body transverse inclination angle sensor (1) and a control unit (3). Each suspension oil cylinder (12) is correspondingly provided with the vehicle body inclination angle regulating unit (17) including the balancing oil cylinder (10). The present invention realizes effectively dynamic leveling function of different road conditions, especially transverse slopes, of the mobile crane. The mobile crane is provided with simple operation that are all automatically performed by the control unit, which improves driving safety remarkably and prevents an accident of vehicle overturning.

The invention discloses a hydro-pneumatic suspension control loop. The design key point of the invention comprises that: a communication relationship between a suspension oil cylinder rodless cavity and an energy accumulator at the same side is controlled by a two position two-way valve to realize rigid and flexible conversion of a suspension system; each suspension oil cylinder rod cavity is communicated with an energy accumulator at the opposite side so as to obtain relatively strong side tilting rigidity; and communication relationships between a pressure oil line and the suspension oil cylinder rodless cavity and between an oil return oil line and the suspension oil cylinder rodless cavity are controlled by a two position two-way valve, respectively so as to control the lifting of a vehicle body. In the multi-axle vehicle hydro-pneumatic suspension system provided by the invention, all the middle axle hydro-pneumatic suspension control loops and rear axle hydro-pneumatic suspension control loops form a lifting control group so as to level the vehicle body. The hydro-pneumatic suspension control loop provided by the invention has reasonable and reliable design and higher comprehensive performance of the suspension system, and is suitable for a multi-axle vehicle, particularly for a multi-axle construction crane. The invention also provides a crane using the hydro-pneumatic suspension control loop.

The invention relates to a car posture adjusting system. A power source is connected with an oil tank, an output end of the power source is sequentially in serial connection with an inlet oil filter and an unloading valve, and a two-position three-way solenoid valve can serve as the unloading valve to supply pressure oil to the adjusting system through electromagnetic reversing. An overflow valve is parallelly connected with the unloading valve, and control on critical pressure of the system can be achieved by adjusting a handle. A b end of an oil outlet of the unloading valve is respectively connected with oil inlet ends of a front suspension control valve and a rear suspension control valve through high-pressure hard tubes or hoses, oil outlet ends of the front suspension control valve and the rear suspension control valve are sequentially connected with a throttle valve group and a suspension hydraulic lock serially, and the suspension hydraulic lock is connected with an oil-gas suspension through a pipeline. When the suspension hydraulic lock is powered off, liquid oil in the oil-gas suspension is separated from the car posture adjusting system, so that stability of car postures and driving performance is ensured, and when the suspension hydraulic lock is powered on, the liquid oil in the oil-gas suspension flows back to the oil tank through the car posture adjusting system.

The invention relates to a suspension valve comprising an oil intake switch lockup valve (22), an oil return switch lockup valve (21) and a differential-pressure sensing logic control element group. The differential-pressure sensing logic control element group comprises a logic shutter valve (23), a differential-pressure sensing lockup valve (24) and a pilot control valve (25), wherein the oil return switch lockup valve realizes the start and lockup functions of return oil; the oil intake switch lockup valve realizes the start and lockup functions of intake oil; the logic shutter valve realizes the logic comparison of pressures of a rod cavity and a rodless cavity of a suspension oil cylinder; and the differential-pressure sensing lockup valve realizes the differential-pressure sensing and the communication lockup of the pressures of the rod cavity and the rodless cavity of the suspension oil cylinder. In addition, the invention also provides an oil gas suspension system adopting the suspension valve and an engineering vehicle thereof. By applying the differential-pressure sensing logical control element group, the durable maintenance and the reliable and rapid conversion of rigidand flexible working conditions of the suspension system are realized more reliably, elements of the suspension valve of an axle suspension system are effectively reduced, and the control is simple and convenient.

A residual pressure holding valve (1) for a hydropneumatic suspension strut (2) of a motor vehicle has a valve housing (3) with an air inlet (4) and an air outlet (5). A valve body (6) is arranged displaceably in the valve housing (3) and a valve element (7) is arranged displaceably in the valve body (6). Air pressure applied to the air inlet (4) can lift the valve body (6) off a valve body seat (8) of the valve housing (3) to allow air to flow past the valve body (6) to the air outlet (5). Air pressure applied to the air outlet (5) can lift the valve element (7) off a valve element seat (9) of the valve body (6) to allow air to flow past the valve element (7) to the air inlet (4).

A self-pumping, hydropneumatic suspension strut unit with an internal level control for a vehicle includes a low pressure chamber and a high pressure chamber for storing a damping medium under pressure. The high pressure chamber includes a gas cushion for displacing the damping medium therefrom when the damping medium is under less than a predetermined pressure. A working cylinder has a piston that defines a first volume of the working cylinder in fluid communication with the high pressure chamber. A piston rod is axially displaceable in inward and outward relative to the working cylinder. A pumping rod is axially mounted at one end in the working cylinder and a regulating bore is disposed at a first location of the pumping rod. The bore is closed when the first location is received in the piston rod and places the low pressure chamber in two-way fluid communication with the first volume when the regulating bore is open. A cavity is located axially in the piston rod for receiving the pumping rod and provides a one-way fluid communication from the low pressure chamber to the first volume. A bypass is disposed at a second location on the pumping rod and is closed when the second location is received in the piston rod for placing the cavity in fluid communication with the first volume when the bypass is open. The piston rod is elastically urged in the inward direction so that when the pressures in the low and high pressure chambers are equal, the piston rod and pump rod cooperatively increase the high pressure chamber pressure to the predetermined pressure whereupon the damping medium displaces the piston outward until the regulating bore hole is open to equalize the pressure of the low and high pressure chambers.

The invention relates to a modularized vehicle position regulating system which regulates the position of a vehicle, and consists of a system power source, a hydraulic device, an oil gas suspension, an electric control unit and a sensor, wherein the system power source, the hydraulic device and the oil gas suspension are connected together through a pipeline, the oil gas suspension comprises at least two left oil gas suspensions and at least two right oil gas suspensions, the hydraulic device comprises a suspension device control combination and a communication hydraulic lock combination, the communication hydraulic lock combination is used for realizing the functions of suspension balancing and hydraulic locking, the suspension device control combination mainly comprises an overflow valve, an unloading valve, a suspension control valve, a right suspension hydraulic lock, a left suspension hydraulic lock, a right throttle valve set and a left throttle valve set, and the overflow valve and the unloading valve are connected in parallel; and an oil outlet end b of the unloading valve is respectively connected with the oil inlet ends of a front suspension control valve and a rear suspension control valve through the pipeline, and the oil outlet ends of the front suspension control valve and the rear suspension control valve are sequentially connected with the throttle valve sets and the suspension hydraulic locks in series.

The invention relates to a load sensing variable damping or a controllable load sensing variable damping shock mitigation system, which is adaptable for air or oil gas hanger brackets (including semi-active hanger brackets) for various vehicles with the damping varying with loading and driving conditions. The shock mitigation system arranges a loading sensing variable damping valve or a controllable load sensing variable damping with a special structure on an air or oil gas hanger bracket, thereby realizing enabling a flowing damp of air or oil gas to automatically change along with loading, or enabling the flowing damp of air or oil gas to automatically change along with loading or to be controlled by signals emitted by a switch or a running state sensor of a driver, thereby realizing the adjustment to the damp. Compared with the internal resistance shock absorber of the traditional air or oil gas hanger bracket, the shock mitigation system has the advantages that the damp not only can automatically change along with the loading, but also can be adjusted along with external controlling signals ( driver's intention or moving state), compared with the air hanger bracket which is usually equipped with an independent shock absorber, the shock mitigation system has the advantages of simple structure, low cost and long service life.

A hydropneumatic suspension system for a vehicle with a level control, in particular for the front axle of a tractor, includes a first 2/2 directional control valve having a regulating-up function communicating with the pressurized oil pump and a second 2/2 directional control valve having a regulating-down function communicating with a reservoir.

The invention discloses a wheel-type amphibious vehicle retractable type oil gas suspension system and a control method of the system. Except for achieving of buffer vibration damping function, the double-direction driving motion is achieved, and wheel retractable functions and vehicle body height adjusting functions are achieved. According to the system, a hydraulic power module is connected to suspension oil gas spring modules through an oil supply channel and an oil returning channel; the hydraulic power module provides hydraulic energy for the suspension oil gas spring modules; each suspension oil gas spring module comprises a working oil cylinder, an energy accumulator, a first damping valve assembly, a second damping valve assembly and an electromagnetic valve set; an upper lug ring of each working oil cylinder is connected with the vehicle body; a lower lug ring of each working oil cylinder is connected to a suspension lower cross arm lug ring support; the first damping valve assemblies are arranged between rodless cavities of the working oil cylinders and the energy accumulators; the second damping valve assemblies are arranged between rod cavities and the rodless cavities of the working oil cylinders; and the electromagnetic valve sets are used for controlling oil liquid for enabling the hydraulic power module to enter and go out of the rod cavities and the rodless cavities of the working oil cylinders and whether the rod cavities and the rodless cavities of the working oil cylinders are communicated or not.

A ride height control system and method may be used to control load distribution at wheel locations in a vehicle suspension system at target ride height. Load distribution may be controlled by adjusting the forces applied by the suspension system at respective wheel locations while maintaining a target ride height. In an exemplary air spring suspension system or hydropneumatic suspension system, the applied forces may be adjusted by adjusting the pressure in the suspension system at the respective wheel locations. The ride height control system and method may determine and establish balanced target ride height forces (e.g., planar forces) to be applied at the wheel locations of the vehicle to prevent a cross-jacking condition. The ride height control system and method may also determine and establish target ride height forces for a vehicle on an uneven surface to prevent imbalances caused by wheel displacement.

The invention belongs to the technical field of automotive suspensions and provides an oil-gas suspension with a volume-variable additional gas chamber and a control method of the oil-gas suspension. The oil-gas suspension comprises a detection mechanism, an execution mechanism, the additional gas chamber, an additional hydraulic cylinder, an oil-gas suspension body, an oil tank and an electronic control unit. By detecting the vehicle speed, the vehicle body vertical acceleration, the vehicle transverse acceleration and liquid pressure signals of a lower cavity of the additional gas chamber and a high-pressure oil storage tank, the electronic control unit achieves adjustment of the pressure of hydraulic oil in the additional gas chamber by controlling the execution mechanism; and high-pressure hydraulic oil is generated by the additional hydraulic cylinder through energy generated during vibration of a vehicle, so that pressure of nitrogen in the additional gas chamber is adjusted, and accordingly the rigidity of the oil-gas suspension body is adjusted. The additional hydraulic cylinder can achieve the functions of a shock absorber, and meanwhile energy waste is reduced. According to the oil-gas suspension with the volume-variable additional gas chamber and the control method of the oil-gas suspension, the rigidity adjustment range is wide; and meanwhile, due to the fact that throttling holes have a damping function, the smoothness of the vehicle is better, and the riding comfort is improved advantageously.

Self-pumping hydropneumatic suspension strut with internal ride-height control, particularly for motor vehicles, with an outer tube with an oil-filled high-pressure work space in the work cylinder under the pressure of at least one gas cushion acting as spring in a high-pressure chamber, a second work space on the piston rod side, and an axially displaceable piston which is supported by a hollow piston rod and is sealed in the work cylinder. The piston rod which is driven by the springing movement of the vehicle conveys oil from a low-pressure chamber to the work space connected to the high-pressure chamber and comprises a pump rod and a pump cylinder formed by the hollow piston rod. The high-pressure chamber is connected with a flow connection arranged in the piston rod guide, wherein a filling bore hole arranged in the outer tube communicates with the flow connection when the piston rod guide is not completely mounted, and the filling bore hole is closed by the piston rod guide after the piston rod guide slides axially into the outer tube.

The invention relates to a rigidity and damping multistage adjustable oil-pneumatic suspension and a control method, and belongs to the field of combination of hydraulic and pneumatic engineering, mechanical engineering and vehicle engineering. The rigidity and damping multistage adjustable oil-pneumatic suspension comprises a hydraulic cylinder, a damping valve, a switch electromagnetic valve andan energy accumulator, the energy accumulator adopts a diaphragm type energy accumulator, an oil cavity of the energy accumulator and a nitrogen chamber are separated by an energy accumulator diaphragm, and the energy accumulator comprises a first energy accumulator A and a second energy accumulator B which are respectively connected with switch valves 9 and 10 in series; a damping adjusting mechanism comprises two switch electromagnetic valves 7 and 8, three throttle valves 4, 5 and 6 and a one-way valve 3, the throttle valves 5 and 6 are respectively connected with the switch electromagnetic valves 7 and 8 in series, and the throttle valves 4, 5 and 6 are connected with one another in parallel. According to the rigidity and damping multistage adjustable oil-pneumatic suspension system,the rigidity and damping can be adjusted according to loads and road conditions, the adaptability of a vehicle to different roads is improved, the driving performance of the vehicle is improved, and the rigidity and damping multistage adjustable oil-pneumatic suspension has the advantages of being convenient to disassemble and assemble, reliable in work, capable of effectively improving the driving comfort and safety of the vehicle and the like.

The invention provides a nonlinear hydropneumatic suspension active control method based on parameter uncertainty and external disturbance. The nonlinear hydropneumatic suspension active control method includes the steps that based on a Newton second law of motion and physical parameters of hydropneumatic suspension, a nonlinear hydropneumatic suspension dynamic model is established; a dynamic model of a servo valve is established based on physical parameters of the servo valve; and an adaptive sliding mode controller is established for the uncertain parameters and unknown disturbance of the nonlinear hydropneumatic suspension dynamic model and the dynamic model of the servo valve, parameters of the adaptive sliding mode controller are set, and control simulation is carried out based on the parameters of the adaptive sliding mode controller. According to the nonlinear hydropneumatic suspension active control method based on parameter uncertainty and external disturbance, the parametersof the controller can be adjusted under the condition that a hydropneumatic suspension system is suffered from parameter uncertainty and external disturbance, the fact that three indicators of the body vertical acceleration of the suspension, the suspension dynamic travel and the wheel dynamic load are all greatly improved can be ensured, and thus control performance of the suspension system is met.

The invention discloses a lifting hydro-pneumatic suspension hydraulic system and relates to a hydraulic system applied to an automobile hydro-pneumatic suspension. According to the lifting hydro-pneumatic suspension hydraulic system, the automation level requirements of the lifting hydro-pneumatic suspension hydraulic system are met, and meanwhile the reliability is improved. The lifting hydro-pneumatic suspension hydraulic system comprises an oil tank (10), an oil supply pump (9), a safety valve (8), a one-way valve (7), an electromagnetic reversing valve (5), a grouping oil returning stopping valve (4), a rigidity stopping valve (2), an oil gas spring (1), an energy accumulator (3), a gas storage cylinder (12), an angle transducer (6), a pneumatic pipeline and a hydraulic pipeline. The oil conveying end of the electromagnetic reversing valve is connected with one oil end of the grouping oil returning stopping valve, and the other oil end of the grouping oil returning stopping valve is connected with the hydraulic oil opening of the oil gas spring. The rigidity stopping valve is arranged between the oil gas spring and the energy accumulator communicating with the oil gas spring. The grouping oil returning stopping valve and the rigidity stopping valve both are pneumatic ball valves.

Self-pumping hydropneumatic suspension strut unit with internal level control, with an oil-filled working cylinder subject to the pressure of gas cushions and with a damping piston, which is free to slide inside the cylinder and is mounted at the end of a hollow piston rod, the cavity of which serves as a pump cylinder for a pump rod attached to the working cylinder. Oil is drawn from a reservoir space when the piston rod travels outward, whereas the oil is conveyed into the working space when the piston rod travels inward. The pump rod passes through the end wall of the working space and is held axially in position by an end-mounted disk, which acts as a universal joint for the rod, and the disk engages in a groove in the pump rod and is held in place by its outer circumference axially between the working cylinder and the end wall of the working cylinder. The disk has a slot to accept the pump rod, the first area of this slot having a diameter corresponding to the base of the groove, whereas the second area has a diameter corresponding to the outside diameter of the pump rod.

The invention relates to a testing device for an oil-gas suspension bracket. The testing device is composed of a base plate, a plurality of excitation devices, single-bridge frames, frame connecting rods, a horizontal stabilizer bar, a mounting rod and oil-gas suspension cylinders. The multiple excitation devices are installed on the base plate; each two excitation devices form one group of excitation shafts; the multiple groups of excitation shafts are arranged at intervals along the length direction of the base plate; and the two excitation devices in each excitation shaft group are distributed at an interval along the width direction of the base plate. A rod end of each excitation device is hinged to one oil-gas suspension cylinder; and each group of excitation shafts corresponds to two oil-gas suspension cylinders. The two ends of each single-bridge frame are connected to the upper ends of the corresponding oil-gas suspension cylinders of one group of excitation shafts in a spherical hinge mode; and the each two adjacent single-bridge frames are connected by one frame connecting rod. A cylinder rod of one excitation device in each group of excitation shafts is connected with one end of the horizontal stabilizer bar in a spherical hinge mode and the other end of the horizontal stabilizer bar is connected with the lower end of the mounting rod in a spherical hinge mode; and the upper end of the mounting rod is installed at the middle part of the corresponding single-bridge frame. According to the invention, testing of various characteristics can be carried out on the whole automobile suspension bracket system.