519results about "Fluid steering" patented technology

The invention discloses a transverse fixed axle assembly capable of achieving Ackerman steering through mechanical linkage, and belongs to the technical field of engineering vehicle chassis. A rear axle is transversely and rigidly fixed to a frame through a shear-resistant box girder structure, and a front axle is connected to the frame through two springs; the rotating pair structures are symmetrically arranged at the two ends of the axle main body and comprise embedded heavy-duty bearings; one end of the steering knuckle arm is hinged to the axle main body through a rotating pair structure, and the other end is connected with the steering pull rod; one end, far away from the rotating pair structure, of the steering pull rod is connected with the steering oil cylinder; the steering pull rod of the front axle and the steering pull rod of the rear axle are crossed and hinged in an X shape, so that intersection points of axes of the front and rear wheels converge at an instantaneous steering center during steering. Abrasion and slipping of tires can be reduced, steering precision is ensured through a pure mechanical structure, the failure risk of an electric control system is avoided, and the system is suitable for heavy equipment such as mining trucks and port cranes.

The invention discloses an unmanned mine car front and rear wheel synchronous steering system which comprises a car frame, a front steering axle and a rear steering axle, and the front steering axle and the rear steering axle are installed on a car and control steering through a steering system. The steering system comprises a front axle working cylinder, a front axle driven cylinder, a rear axle working cylinder and a rear axle driven cylinder, the front axle working cylinder and the front axle driven cylinder control front wheels of a vehicle to rotate, the rear axle working cylinder and the rear axle driven cylinder control rear wheels of the vehicle to rotate, and cavities of the front axle working cylinder and the rear axle working cylinder are communicated with a working port A and a working port B of a three-position four-way reversing valve through pipelines respectively. Cavities of the front axle driven cylinder and the rear axle driven cylinder are communicated through a valveless rigid connecting pipeline to form a rigid series oil way, and in the rigid series oil way, the amount of oil discharged by the front wheel working cylinder and the front axle driven cylinder is equal to the amount of oil received by the rear wheel working cylinder and the rear axle driven cylinder. Mechanical hydraulic synchronization of steering angles of front and rear wheels of the vehicle is realized, delay and fault risks of dependence on sensors are eliminated, and high-reliability rigid synchronization is realized.

The invention belongs to the technical field of new energy automobile steering systems, and discloses a new energy automobile electric hydraulic power-assisted steering system and a control method thereof.The system integrates a double-source redundant hydraulic power unit, a hydraulic adjusting unit, a multi-dimensional working condition sensing unit and an intelligent main controller; the multi-dimensional working condition sensing unit is integrated with a road adhesion coefficient detection module and a battery remaining capacity detection module. The control method is layered look-ahead matching control and is executed by an intelligent main controller in parallel: a power-assisted decision-making layer divides a three-stage power-assisted mode according to multi-dimensional perception information, and limits a steering angular velocity when power-assisted is enhanced on a low-attached road surface; the energy optimization layer predicts and implements prospective energy storage and pump rotating speed self-adaptive adjustment based on the intention of a driver; and the fault diagnosis layer realizes rapid fault identification and redundancy switching through multi-parameter collaborative diagnosis. The contradiction of high energy consumption, response delay and weak safety guarantee of a traditional system is solved, and power-assisted steering which is safe, energy-saving, fast in response and high in adaptability is achieved.

The invention discloses a drive-by-wire hydraulic steering system and method based on linear active disturbance rejection, and belongs to the technical field of automobile steering, the steering system comprises a hydraulic control unit and a control module, the hydraulic control unit is used for controlling the movement direction and the movement speed of a steering oil cylinder by controlling the flowing direction and the flowing speed of hydraulic oil; and the control module is used for calculating the received input turning angle and the actual turning angle according to a linear active-disturbance-rejection steering angle control algorithm, controlling the steering of a steering control valve in the hydraulic control unit, and indirectly controlling the steering angle and the motion trail of the vehicle through the steering of the steering control valve. By means of the steering system and method, the problems of non-linear interference such as uncertainty of tire aligning torque influence factors and electromagnetic coupling of a steering execution motor can be effectively solved, high-precision steering angle tracking control is achieved, the steering precision and the response speed of a vehicle are remarkably improved, and the maneuverability and the sense of safety of a driver are improved.

The application belongs to the technical field of golf courses, and discloses a steering mechanism applied to a golf cart, which comprises a mounting cylinder and a mounting sleeve, the inside of the mounting cylinder is movably sleeved with a control shaft, and the outer surface of the control shaft is fixedly sleeved with a gear sleeve. The application is characterized in that the two ends of the arc groove are arranged in a lower-upper mode, one end of the reverse rotation is moved upward and communicated with the corresponding pipeline, the sliding oil in the storage cylinder is extruded by the foot sole stepping and pushing mechanism, the sliding oil enters the control disc under pressure and is communicated into the mounting sleeve along the opposite direction of the steering direction, and the inner shaft in the mounting sleeve is rapidly moved along the moving direction of the rotation direction, so that the power assistance during rotation is realized. When the steering operation is performed on the complex road surface, the hydraulic power assistance is realized by the leg force, the hand control is matched, the actual steering convenience is greatly improved, the steering is labor-saving and reliable, and the actual driving safety is greatly improved.

The application relates to the technical field of new energy commercial vehicle chassis, and particularly discloses a vehicle with a modular hydrogen fuel cell heavy truck arrangement structure, which comprises a power system, an energy storage module system and a driving system. The power system is arranged with a flattened high-low temperature cooling integrated sub-module, a fuel cell engine and an accessory module, and an air conditioner and waste heat recovery system integrated sub-module. The energy storage system is arranged with a side-hung hydrogen bottle sub-module, a rear hydrogen bottle sub-module, a multi-in-one controller integrated sub-module, a high-voltage accessory integrated sub-module, a low-voltage accessory integrated sub-module and a power battery sub-module. The driving system adopts an electric drive axle module integrated scheme, and the electric drive axle module is integrated with a driving motor, a motor controller, a transmission and a drive axle. The functions and structures of the sub-module systems are highly integrated, and the integrated and lightweight levels are high. The integrated arrangement of the modules is not restricted by market conditions, vehicle types, cab types and the like, and the universality and interchangeability levels of the components are greatly improved.

The invention provides a control method and device of an electro-hydraulic steering gear and a vehicle, and relates to the technical field of steering gear, and the control method comprises the steps that when a driver operates steering, first control is executed; and when the driver does not operate steering and the external interface of the electric power assisting system has the steering requirement, second control is executed. The first control comprises the steps that the electric power system is controlled not to provide electric power in response to the situation that hydraulic power provided by the hydraulic power system does not reach the maximum limit value; determining a current ideal torque corresponding to the current vehicle speed and the current lateral acceleration of the vehicle according to the corresponding relation among the vehicle speed, the lateral acceleration and the ideal torque in response to the situation that the hydraulic assistance reaches the maximum limit value; and according to the difference value between the current input torque and the current ideal torque of the steering wheel, the electric power system is controlled to provide electric power. The second control comprises the steps of controlling the electric power assisting system to provide electric power assisting and controlling the hydraulic power assisting system to provide hydraulic power assisting. The steering comfort can be improved.

A valve (400) for hydraulic parallel work systems (100) is provided. The valve (400) includes a first pair of ports (416, 416a-b), a second pair of ports (422, 422a-b), a first connection, and a second connection. The first connection is between the first pair of ports (416, 416a-b) when the valve (400) is in a load reaction-enabling state (LRQN). The first connection transmits a load reaction (402) from a load at a steering actuator (140) to a steering device of a hydrostatic steering circuit (200). The second connection is between the second pair of ports (422, 422a-b) when the valve (400) is in an electro-hydraulic steering enabling state. The second connection fluidly connects a fluid source (110) to an electro- hydraulic steering circuit (300).

The application discloses a bidirectional driving four-wheel multifunctional hydraulic control method, which comprises a hydraulic control method for controlling driving when a front cab, a hydraulic control method for controlling circle turning when the front cab, a hydraulic control method for controlling driving when a rear cab and a hydraulic control method for controlling circle turning when the rear cab. The switching of multiple oil paths is realized through the opening and closing of a valve group, so that the front axle or the rear axle steering function can be controlled by one cab, and the problem of single steering function is solved. Meanwhile, the position sensor is arranged to realize the automatic identification of the position of a steering oil cylinder and the automatic tire correction centering. In addition, the circle turning function is increased. The hydraulic control method provided by the application can quickly switch the driving mode and simplify the steering operation steps.

The invention belongs to the technical field of forklift hydraulic diagnosis optimization, and provides a fault self-diagnosis and optimization method for a forklift hydraulic system, which is used for monitoring the air pressure of an oil suction pipeline in the forklift hydraulic system, judging whether the oil suction pipeline leaks air or not, directly determining whether a fault occurs at the oil suction pipeline or not, and improving the working efficiency of the forklift hydraulic system. The content of bubbles in oil can be reduced, the pressure and flow transmission efficiency of a hydraulic system can be improved, when it is judged that an oil suction pipeline leaks air, under the scene that the forklift steers at a small angle continuously between narrow goods shelves, the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained respectively, and the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained. The correlation degree between the steering lag time and the oil bubble compression time is evaluated, the influence mechanism of air leakage on a steering system is known more deeply, different types of faults can be distinguished, the main reason of steering lag caused by oil bubble compression can be quickly positioned, and the method and the device can be used for adjusting parameters such as the sending opportunity and the frequency of a steering instruction in the later period. And data support is provided.

The utility model belongs to the technical field of land levelers, and discloses a steering structure and a land leveler. The steering structure comprises a bridge frame, two steering knuckles, a double-acting oil cylinder and a sliding connection assembly. The two steering knuckles are rotationally arranged at the two ends of the bridge frame in the first direction; the double-acting oil cylinder comprises a piston rod and an oil cylinder body arranged on the piston rod in a sliding mode, and the piston rod is fixedly arranged on the bridge frame and extends in the first direction. The sliding connection assembly comprises a sliding connection body and two steering pull rods, the sliding connection body is fixedly connected with the oil cylinder body, meanwhile, the sliding connection body is in sliding connection with the bridge frame in the first direction, and the two ends of the sliding connection body in the first direction are hinged to one ends of the two steering pull rods correspondingly; the ends, away from the sliding connecting body, of the two steering pull rods are hinged to the two steering knuckles correspondingly. According to the steering structure, the sliding connector can limit the oil cylinder body to rotate around the axis of the piston rod, abrasion of the double-acting oil cylinder is reduced, and the service life of the double-acting oil cylinder is prolonged.

The invention discloses a hydraulic power steering gear structure and a mounting method thereof, the structure comprises a hydraulic power steering gear, a transmission shaft and a steering tie rod, the hydraulic power steering gear is connected with a steering wheel through the transmission shaft, the hydraulic power steering gear is connected with the steering tie rod through a steering pull arm, and the steering tie rod is connected with a tire. According to the mounting platform with the positioning rod, the technical problems that the steering performance cannot be met and the assembly efficiency is low due to the fact that the initial posture of a steering pull arm does not have standard positioning during mounting of an existing hydraulic power steering gear, the left steering limit angle and the right steering limit angle are inconsistent, the pressure relief function fails, hydraulic locking cannot be achieved, and the steering performance cannot be met can be solved. The invention discloses a method for positioning the initial position of a standardized steering pull arm, which ensures that the steering angle of the steering pull arm is symmetrical and the pressure relief function and the stop function of the hydraulic power steering gear are normal, improves the assembly efficiency and avoids later debugging.

A steering system controllable by a redundant braking system, the redundant braking system including a primary braking control module, a secondary braking control module, and a plurality of braking units controlled by the primary braking control module or the secondary braking control module. There is at least one hydraulic motor connected to a component of the steering system, and fluid pressure in the hydraulic motor is controlled by the secondary braking control module. Wheels of the steering system are configured to turn right when the secondary braking control module operates the hydraulic motor during a first operating mode, and the wheels of the steering system are configured to turn left when the secondary braking control module operates the hydraulic motor during a second operating mode.

The present invention discloses a vehicle fuzzy feedforward path tracking control method based on hydraulic steering leakage compensation. The method comprises: acquiring the steering wheel angle, wheel angle, and piston rod displacement; outputting desired wheel and steering wheel angles in different cycles using a path tracking algorithm; obtaining a feedforward leakage compensation parameter via fuzzy control; constructing a fuzzy control system; defuzzifying it using the centroid method to yield a fuzzy sliding mode controller; comparing the actual rear wheel angle; and controlling a compensation solenoid valve to replenish fluid each cycle. These steps are repeated for subsequent cycles until the path tracking process is complete. The method precisely determines the feedforward compensation parameter, thus accurately controlling the solenoid valve's duty cycle to timely compensate for leakage and enhance the path tracking accuracy of intelligent vehicles.

The application discloses a kind of steering control device and method in truck sudden deceleration process, the device includes control unit and steering inhibition mechanism;Steering inhibition mechanism is installed on the steering tie rod of front axle assembly, it includes mechanism body, cylinder and V wedge-shaped slider, mechanism body is set on steering tie rod, and steering tie rod is equipped with the taper boss of coaxial arrangement;Cylinder is arranged at the outside of mechanism body, and the piston rod of cylinder is connected with push plate, and multiple guide rods are arranged on push plate, guide rod extends to the inside of mechanism body, and is connected with V wedge-shaped slider, and the side of V wedge-shaped slider facing taper boss is equipped with V type slot, and V type slot and taper boss are mutually matched.The application can automatically ensure that vehicle steering wheel does not run off in the case of truck high-speed driving sudden deceleration, avoid serious accidents such as sideslip, overturning and collision, can reduce the operation difficulty of driver, meet the control demand of high-level automatic driving system, improve driving safety.

A steering device of the present invention is provided with an input side housing including an opening end surface through which a steering shaft passes. A step portion having a diameter stepwisely enlarged toward the opposite side of a steering wheel in the axial direction of the steering shaft is formed on the inner peripheral surface of the axial end portion on the opening end surface side of the input side housing. A ring-shaped dust seal is fitted into the step portion to seal the space between the inner peripheral surface of the input side housing and the outer peripheral surface of the steering shaft. A space in which water can accumulate exists between the steering shaft, the axial end portion of the input side housing, and the dust seal. A first groove, capable of discharging the water accumulated in the space, is formed in the axial end portion.

The invention provides an oil-gas pump all-in-one machine and a vehicle, and the oil-gas pump all-in-one machine comprises a driving motor which is provided with a driving shaft with two output ends; the steering oil pump is connected with a shell of the driving motor, and an input shaft of the steering oil pump is connected with the first end of the driving shaft; an input shaft of the air compressor is connected with the second end of the driving shaft through an electromagnetic clutch; the pressure sensor is connected with the steering oil pump, and the pressure sensor is used for detecting the pressure of an oil outlet of the steering oil pump; the controller is connected with a shell of the driving motor, the controller is electrically connected with the driving motor, the pressure sensor and the electromagnetic clutch, the controller is used for regulating and controlling the rotating speed of the driving motor according to the pressure of the oil outlet, and the controller is further used for controlling combination and separation of the electromagnetic clutch. According to the scheme, dynamic adjustment of the oil pressure of the steering oil pump is achieved, and the technical problem that dynamic control over the oil pressure of the steering oil pump cannot be achieved in the prior art is solved.

The invention relates to the technical field of engineering machinery, in particular to an electric control proportional steering brake valve based on hydraulic transmission and a control method, an electric proportional pressure reducing valve is adopted to replace a traditional hydraulic control pilot handle, and the electric proportional pressure reducing valve outputs pilot pressure oil with variable pressure according to an operation instruction to push an active valve element A and an active valve element B to act; the active valve core A pushes the brake valve core to act, and power pressure oil is communicated with the brake to realize braking; the driving valve element B pushes the steering valve element to act, and main power pressure oil is communicated with a steering clutch to achieve steering. Pilot pressure output to a steering and braking unit is accurately controlled through an electric signal, and linear proportional adjustment of pressure and current is achieved. Through the design of double-spring pressure regulation and oil way separation, not only is the fine adjustment smoothness in the low-pressure stage ensured, but also the pressure is quickly increased at a key threshold value to prevent the clutch from slipping, and meanwhile, the damage of high temperature and impurities of a main oil way to a precise control element is effectively isolated, so that the control precision, response stability and reliability of a system are remarkably improved.

In a work vehicle whose wheels are driven by a hydraulic motor, the hydraulic hose from the hydraulic pump mounted on the machine is connected to the hydraulic motor with minimal damage. [Solution] The system includes a steering member 26, a wheel 19 supported by the steering member 26, a hydraulic motor 27, and a first hydraulic hose 10 capable of supplying hydraulic fluid from a hydraulic pump to the hydraulic motor 27. The first hydraulic hose 10 is fixed to the first fixing member 41 and has a first portion 11 that extends from the first fixing member 41 along the support arms 8 and 9 toward the opposite side from the steering member 26, a second portion 12 that extends from the first portion 11 in the opposite direction along the support arms 8 and 9 toward the steering member 26, and a third portion 13 that extends from the second portion 12 toward the hydraulic motor 27, is fixed to the second fixing member 42 and connected to the hydraulic motor 27.

A work machine includes a vehicle body, traveling wheels, a steering member, an actuator, and a controller. The steering member is operable in a left steering range, a right steering range, and a neutral range. In a case where the steering member is located in the neutral range, the actuator sets a steering angle of the traveling wheels to a predetermined neutral angle. The actuator changes the steering angle from the neutral angle to left and right, in accordance with an operation of the steering member. When the steering member is operated from the left steering range or the right steering range to the neutral range, the controller determines whether the steering angle returns to the neutral angle. The controller determines a traveling direction of the vehicle body at a time when the steering angle returns to the neutral angle as a target direction. The controller controls the actuator so that the traveling direction of the vehicle body is maintained on the target direction.

The invention relates to a multi-circuit protection valve assembly (2), comprising, attached to or integrated into a main housing (2b), an air inlet; main outlets (6); main supply lines; and main overflow valves for protecting the main outlets (6), wherein it further comprises an extension part (20) having, attached to or integrated into an extension housing (25), an extension inlet (21); an extension outlet (7); an extension line; and an extension overflow valve for protecting the at least one extension outlet (7), wherein the extension housing (25) is detachably fixed to the main housing (2b) such that the extension inlet (21) is flow-connected to an auxiliary outlet (19) in the main housing (2b). According to the invention, the extension housing (25) is detachably fixed to the main housing (2b) by a hollow screw (30) having a cavity, wherein said hollow screw (30) passes through the extension housing (25) and is screwed into the auxiliary outlet (19) such that the extension housing (25) is clamped to the main housing (2b), and such that compressed air discharged through the auxiliary outlet (19) can be conducted through the cavity inside the hollow screw (30) to the extension overflow valve and the at least one extension outlet (7).

The application provides a kind of engineering vehicle walking steering integrated control device based on double pump swing arm linkage, adopts double pump independent variable + mechanical swing arm linkage, without electromagnetic valve, without complex circuit, pure mechanical hydraulic control, high reliability, can realize zero radius spot steering, greatly improve the vehicle mobility and operation efficiency.The device includes gear reducer, double pump, mechanical control mechanism;Mechanical control mechanism contains steering wheel connecting rod 1, forward and backward block connecting rod 5, swing arm assembly (front pump swing arm 12, rear pump swing arm 16), drum guide assembly.The power output end of gear reducer drives double pump rotation, the output pressure oil of double pump, after speed reduction and torque increase by walking gear reducer, drives vehicle walking, realizes forward, backward, left turn, right turn and spot steering.

The application discloses a steering brake system and engineering machinery, the steering brake system comprises a gear pump, the oil outlet of the gear pump is connected with the P port of a priority valve, the EF port of the priority valve is combined with a working system, the CF port of the priority valve is connected with the P port of a steering gear and the P port of a signal control valve respectively, the Ls port of the steering gear is connected with the Ls2 port of the signal control valve, the Ls port of the priority valve is connected with the Ls1 port of the signal control valve, the A port of the signal control valve and the P port of a brake valve are connected with an accumulator respectively, the steering gear is used for controlling a steering oil cylinder to realize steering, the signal control valve is used for controlling parking brake, and the brake valve is used for controlling service brake. The application realizes that working, steering and braking share an oil source, the intermittent working characteristics of the brake system are utilized to avoid mutual interference of the working and the steering when they work simultaneously, and steering and braking performances are ensured.

Hydraulic steering arrangement (1) comprising a supply connection arrangement with a supply connection (2) and a return connection (3), a working connection arrangement with two working connections (4, 5), a supply flow path (7) between the supply connection (2) and one of the working connections (4, 5), a return flow path (9) between the other of the working connections (5, 4) and the return connection (3), and a valve arrangement with a control piston / sleeve set, wherein the supply flow path (7) has a feed orifice (A4) and the return flow path (9) has a return orifice (A5), wherein a variable damping orifice (Adp) is arranged downstream of the feed orifice (A4) and upstream of the return orifice (A5), characterized in that the variable damping orifice (Adp) is formed by the control piston / sleeve set.

The invention relates to an electrohydraulic power steering device (105) for a vehicle (100), comprising a hydraulic pump (110), a drive (115), a first working line (120), a second working line (125), and a heat transfer unit (130). The hydraulic pump (110) is designed, in a first rotation direction, to pump a hydraulic oil to a first pump output (135) of the hydraulic pump (110) and, in a second rotation direction, to pump said oil to a second pump output (140) of the hydraulic pump (110). The drive (115) is coupled to the hydraulic pump (110) and is designed to drive the hydraulic pump (110) optionally in the first rotation direction or second rotation direction. The first working line (120) is shaped to connect the first pump output (135) fluidically to a first working chamber (145), the first working chamber (145) being suitable for moving a piston (160), which is couplable to a steering bar (150) of a steering system (155), in a first direction (165). The heat transfer unit (130) is designed to transfer heat (180) that is generated during operation of the drive (115) to at least one of the working lines (120, 125) in order to heat the hydraulic oil flowing through the working line (120, 125).

This transport vehicle comprises a steering circuit including: a steering cylinder steered by hydraulic oil of a hydraulic pressure source; a steering valve that controls the flow of the hydraulic oil to the steering cylinder; and an accumulator that stores the hydraulic-oil pressure from the hydraulic pressure source and that can supply the pressure to the steering cylinder via the steering valve. The steering circuit is connected to the hydraulic pressure source and a hydraulic oil tank via a composite control valve. The composite control valve has: a first position at which communication is enabled between the steering circuit and the hydraulic pressure source and at which communication is shut-off between the steering circuit and the hydraulic oil tank; and a second position at which communication is enabled between the steering circuit and the hydraulic pressure source and at which communication is enabled between the steering circuit and the hydraulic oil tank. The composite control valve includes a narrowed section in an oil path that enables communication between the steering circuit and the hydraulic oil tank, at the second position.

The utility model provides an agricultural machinery wheel steering angle detection structure and a harvester, the agricultural machinery wheel steering angle detection structure comprises a bridge body assembly, the bridge body assembly is provided with a steering oil cylinder and an angle sensor, the output end of the steering oil cylinder is provided with a motion transmission part, and the motion transmission part is provided with an angle sensor. A sensor swing arm perpendicular to the steering oil cylinder is arranged at the detection end of the angle sensor, one end of the motion transmission component is connected with the sensor swing arm, and when the steering oil cylinder drives the motion transmission component to move, the motion transmission component can drive the sensor swing arm to swing; steering mechanisms are arranged at the two ends of the axle body assembly, tires are arranged on the steering mechanisms, and the output ends of the steering oil cylinders are connected with the steering mechanisms. The device is simple in structure, can be installed on an existing harvester bridge body, and is low in improvement cost; the steering oil cylinder synchronously drives the steering mechanism and the sensor swing arm to move, the synchronization error is small, and the timeliness and the detection precision of signal feedback are improved.

A system for hydraulic parallel work systems is provided. The system includes a fixed displacement pump (110), a closed-center circuit (300), an open-center hand metering unit (HMU) (200), and a tank (120). The closed-center circuit is in fluid communication with the fixed displacement pump. The open-center HMU is in fluid communication with the fixed displacement pump at an inlet port (204) of the HMU. The tank is fluidly connected to the inlet port of the HMU when the HMU is inactive.

The invention relates to a hydraulic steering system (1, 47, 54, 62) comprising a hydraulic steering unit (3) and a plurality of directly connected hydraulic conduits (18, 22, 42, 61). The directly connected hydraulic conduit (18, 22, 42, 61) is directly connected to the hydraulic steering unit (3). At least one of the directly connected hydraulic conduits (18, 22, 42, 61) comprises a fluid branching connection (21, 23, 41) which branches off at least one of the directly connected hydraulic conduits (18, 22, 42, 61) into at least two indirectly connected hydraulic conduits (14, 15, 28, 29, 35, 36). The at least two indirectly connected hydraulic lines (14, 15, 28, 29, 35, 36) each comprise at least one fluid flow influencing device (19, 20, 26, 27, 37, 38, 43, 44, 45, 46, 48, 49, 50, 51).

This application discloses an engineering vehicle and its steering control system and method. This system can be used in both new energy vehicle architectures and fuel vehicle architectures. The steering control valve assembly is located on the oil supply line, which splits the oil supply line into a steering line and a centering line. The steering line is connected to the steering actuator, and the centering line is connected to the centering actuator. The steering control valve assembly has a first switching state and a second switching state for controlling the oil flow path. The centering control valve assembly is located on the centering line. In the first switching state, the steering line supplies oil to the steering actuator, and the centering control valve assembly controls the centering line to unload. In the second switching state, the steering line unloads, and the centering control valve assembly controls the centering line to supply oil to the centering actuator. This application enables interlocking of vehicle steering and centering, meaning the vehicle can only be in either steering or centering state at a time, avoiding the phenomenon of high-pressure oil simultaneously present in steering and centering due to component failure.