1629results about "Fluid steering" patented technology

Electro-Hydraulic Steering System and Method An electro-hydraulic steering system (1) includes a steering wheel (2) for setting a steering demand and a hydraulic steering actuator (11) for turning the steered wheel in response to the steering demand. An electrically controlled hydraulic valve (26) is arranged to supply pressurised fluid to the hydraulic steering actuator to turn the steered wheel according to a variable steering ratio. An electronic control unit (21) receives an angular position of the steering wheel and an angular position of the steered wheel. The control unit is operative to determine an angular misalignment between the steering wheel and the steered wheel and carry out a realignment procedure. The realignment procedure comprises calculating a compensation angle based on the angular misalignment and controlling the steering ratio based on the compensation angle by controlling the hydraulic valve to adjust the supply of pressurised fluid to the hydraulic steering actuator.

The invention relates to a hydraulic system of a steering mechanism, the steering mechanism and engineering machinery, the hydraulic system of the steering mechanism is used for controlling forward running steering and reverse running steering of a vehicle, and the hydraulic system of the steering mechanism comprises a hydraulic pump (1); the unloading valve group (2) is arranged on an oil supply path of the hydraulic pump (1), and the unloading valve group (2) is configured to release the pressure of the hydraulic oil; the proportional control valve group (3) is arranged on a working oil way of the unloading valve group (2), and the proportional control valve group (3) is configured to control the steering direction and the steering angle of the first steering axle (10) and the steering angle of the second steering axle (20); the flow amplification valve group (4) is arranged between the proportional control valve group (3) and the steering oil cylinder (5), the flow amplification valve group (4) and the steering oil cylinder (5) are both located on a working oil way of the proportional control valve group (3), and the flow amplification valve group (4) is configured to amplify the flow of hydraulic oil entering the steering oil cylinder (5).

A method for handwheel actuator bind and / or steering column detection includes receiving, in response to a signal indicating a change in position of power steering column, a handwheel torque signal from a sensor associated with a handwheel of a vehicle. The method also includes determining whether a torque value associated with the handwheel torque signal is greater than a threshold. The method also includes, in response to a determination that the torque value associated with the handwheel torque signal is greater than the threshold, initiating at least one countermeasure.

An apparatus for operating a load-controlled hydraulic supply of an agricultural tractor includes a hydraulic pump which is adjustable with respect to the displacement volume for supplying pressurized hydraulic fluid, a proportional valve which is electrically actuatable, a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump, a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve, and a control unit configured to move the proportional valve into a closed valve position when the control unit recognizes that at least one of a required power of the primary and secondary hydraulic consumers exceeds the conveying capacity of the hydraulic pump and the subordinate hydraulic function of the secondary hydraulic consumer is inactive.

The invention provides a method and device for maintaining hand power of a driver, a vehicle and a storage medium. According to the method, by means of an electromagnetic relay on a first steering column, a torsion spring wound on a second steering column and a metal disc on the torsion spring which are included in the steer-by-wire system, when a steering column motor breaks down, it is ensured that an electromagnet in the electromagnetic relay is attracted to the metal disc by enabling the electromagnetic relay to be in a power-on state. Thus, when a driver rotates the steering wheel, the first steering column and the electromagnetic relay can rotate along with rotation of the steering wheel, then the attracted metal disc is driven to rotate, and the torsion spring is further driven to rotate. The torsion spring generates rotating force so that hand force feedback can be provided for a driver to simulate the hand feeling. Therefore, according to the method, the hand feeling of the driver can be simulated after the steering column motor breaks down, and the driver is assisted to safely drive the vehicle.

The invention belongs to the related technical field of hydraulic drive, and discloses an unmanned tractor hydraulic drive system which comprises an engine, a transfer case, a load-sensitive pump 15, a load-sensitive proportional multi-way valve 16, a straight hydraulic motor set 17, a steering metering pump 13, a priority valve 12, a speed regulating valve set 8, a three-position four-way electromagnetic reversing valve set 9, a hydraulic control one-way valve set 10 and a steering hydraulic motor set 11. Hydraulic drive is adopted, power is transmitted through an oil way, a transmission system is simple, stepless speed change can be achieved, speed regulation is convenient, and the tractor can be driven by controlling the opening degree and direction of a valve of a hydraulic element through electric signals; through the arrangement of the load-sensitive proportional multi-way valve and the load-sensitive pump, the problem that the driving capacity is lost due to uneven loads when motors are connected in parallel can be effectively solved, wheels of the tractor can keep rotating synchronously under different load conditions, and the stability and the running performance of the tractor under complex ground conditions are ensured.

The steering system comprises an oil tank, an oil pump, an electromagnetic valve, a steering gear, a first oil cylinder, a second oil cylinder and a flow amplifying valve, the oil pump extracts hydraulic oil from the oil tank and provides pressure oil through an oil outlet of the oil pump, and the electromagnetic valve is provided with a first electromagnetic valve position and a second electromagnetic valve position and used for switching oil paths. The steering gear is provided with an oil inlet, an oil return port, an L oil supply port and an R oil supply port, oil is distributed according to a steering instruction, when the electromagnetic valve is located at a first electromagnetic valve position, a first oil cylinder small cavity and a second oil cylinder large cavity are controlled to obtain oil or the first oil cylinder large cavity and the second oil cylinder small cavity are controlled to obtain oil to achieve rapid rotation, and when the electromagnetic valve is electrified and located at a second electromagnetic valve position, the steering gear is driven to rotate. The hydraulic oil bypasses the flow amplifying valve and directly enters the first oil cylinder large cavity or the second oil cylinder large cavity, so that low-speed steering operation is completed, the high-speed steering effect and the low-speed steering effect are achieved, the applicability, stability, accuracy and economical efficiency of a steering system are improved, and the requirements of different users are met.

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.

An auxiliary steering device for a hydrostatic vehicle steering system, includes an input shaft, which can be actuated or set in rotation by a steering wheel, an output shaft for actuating a steering metering valve, and a planetary gearing. The planetary gearing includes a planetary wheel carrier with multiple planetary wheels, which mesh with a sun gear and a surrounding ring gear. The input shaft is connected to the planetary wheel carrier and the output shaft is connected to the sun gear in each case for conjoint rotation. The auxiliary steering device has an electric drive for exerting a torque on the ring gear, a braking device for fixing the input shaft, and a coupling device for producing a rotationally fixed connection between the output shaft and the planetary wheel carrier.

A method for steering wheel actuator jamming and / or steering column detection includes receiving a steering wheel torque signal from a sensor associated with a steering wheel of a vehicle in response to a signal indicative of a change in position of a power steering column. The method also includes determining whether a torque value associated with the steering wheel torque signal is greater than a threshold. The method also includes initiating at least one countermeasure in response to determining that the torque value associated with the steering wheel torque signal is greater than the threshold.

The invention belongs to the technical field of hydraulic systems, and discloses a drive-by-wire full-hydraulic system and method and a steering method. Wherein the drive-by-wire full-hydraulic system comprises an integrated control valve module, the integrated control valve module is connected with a hydraulic oil tank, an oil filter and an electric control full-hydraulic steering gear module, the electric control full-hydraulic steering gear module is connected with a control module and a wheel angle sensor, and the hydraulic oil tank is sequentially connected with an electronic oil pump and the oil filter; according to the system, hydraulic oil leakage can be effectively prevented, the safety risk is remarkably reduced, natural resources and the ecological environment are protected, consistency and synchronization of actual steering and steering required by control are achieved, steering controllability is improved, and system safety is further improved.

The invention relates to the technical field of engineering machinery, and discloses a wheel-track composite steering hydraulic control system, a control method and an engineering vehicle. The wheel-track composite steering hydraulic control system comprises an oil supply module, a tire steering module, a track steering module and a control module. The tire steering module comprises a steering valve group and at least two wheel type steering oil cylinders, the steering valve group is connected with the oil supply module and the at least two wheel type steering oil cylinders, and the oil supply module supplies hydraulic oil to each wheel type steering oil cylinder through the steering valve group; the crawler steering module comprises a closed pump, a crawler walking motor and a first angle detection module, the closed pump is connected with the crawler walking motor, and the first angle detection module is used for detecting the rotating angle of a steering wheel. Free switching between wheel steering and track steering can be achieved through one system, the system structure is simplified, operation is more convenient, and the maintenance cost is low.

A pure electric mining dump truck hydraulic system comprises a hydraulic steering system and a hydraulic lifting system, and the hydraulic steering system comprises a steering plunger pump, an energy accumulator, a multi-way valve assembly, a steering valve, a two-way unloading valve, a steering cylinder and an electromagnetic reversing valve; the lifting system comprises a gear pump, an overflow valve, a lifting valve, an oil suction filter, a lifting control handle, a pilot valve block, a bounce valve, a lifting cylinder and a lifting hydraulic oil tank. And the steering plunger pump and the lifting plunger pump are driven by a double-shaft extension motor. A single motor can drive the two hydraulic systems to operate stably, space is saved, meanwhile, jamming and preparation time of the two systems during operation and switching are shortened, energy is saved, and efficiency is improved.

The invention discloses a drive-by-wire system with redundancy safety, which is applied to engineering machinery and is characterized by comprising a redundancy steering module, a redundancy braking module and a control module, the redundant steering module is used for limiting the number of turns of a steering wheel of the vehicle through a limiting unit and carrying out simulation feedback on road feel by arranging a resistance feedback unit; and the redundant braking module is used for carrying out three-in-one combined braking of electric braking, hydraulic service braking and parking braking on a braking system of the vehicle. The device is compact in structure, safe, reliable and convenient to control, steering limiting and motor resistance torque increasing are adopted, and the steering performance of the drive-by-wire chassis can be guaranteed; meanwhile, a redundant design of an angle sensor and a displacement sensor of the steering oil cylinder is adopted, so that the steering safety is ensured; the safety redundancy design of service braking, parking braking and electric braking is adopted, and the safety of service braking and parking braking is guaranteed; and the driving safety of the drive-by-wire chassis is ensured.

An auxiliary hydraulic system including an accumulator, a control valve, and a hydraulic connector. The accumulator connects to a primary hydraulic system including a hydraulic pump, a brake circuit, and a steering circuit. The control valve selectively allows or prevents flow from an accumulator to at least one of the brake circuit and the steering circuit. The hydraulic connector selectively connects an external source to the accumulator and the control valve.

Method for determining and / or monitoring a mechanical condition of at least one tie rod assembly (10) of an electrically assisted steering system (12) of a vehicle (14), wherein the mechanical condition of the tie rod assembly (10) is linked to steering play, in particular caused by mechanical wear, wherein at least one operating characteristic (16) correlated with a steering movement of at least one steering actuator (18) and / or at least one steering control unit (20) of the steering system (12) is determined and evaluated for determining and / or monitoring the mechanical condition of the tie rod assembly (10), wherein the evaluation of the operating characteristic (16) takes place in a steering range in which forces (28, ) acting on the tie rod assembly (10)30) in the form of a steering force exerted on a steering actuating element (52) and a restoring force acting in the opposite direction to the steering force of at least one vehicle wheel (46) of the vehicle (14) at least substantially compensate.

The invention discloses a dual-redundancy hydraulic four-wheel steering system which comprises a steering valve group, a plunger pump, a hydraulic oil tank, a front axle steering cylinder, a first electro-hydraulic steering valve, a second electro-hydraulic steering valve, a rear axle steering cylinder, a third electro-hydraulic steering valve, a fourth electro-hydraulic steering valve, a first flow amplifier, a second flow amplifier, a first converging valve group and a second converging valve group. The invention further discloses an unmanned mining dump truck and a dual-redundancy hydraulic four-wheel steering method. The two flow amplifiers are controlled through the four electro-hydraulic steering valves to achieve the steering action of the front steering cylinder and the rear steering cylinder, the steering requirement of bidirectional driving is met, meanwhile, the front axle and rear axle dual-redundancy steering function is achieved, and steering safety is improved.

A method for detecting a blockage of the handwheel actuator and / or steering column includes receiving a handwheel torque signal from a sensor linked to a vehicle handwheel in response to a signal indicating a change in the position of the power steering column. The method also includes determining whether a torque value associated with the handwheel torque signal exceeds a threshold value. Furthermore, the method includes initiating at least one countermeasure in response to a determination that the torque value associated with the handwheel torque signal exceeds the threshold value.

The invention discloses a drive-by-wire steering system of a mining dump truck. The drive-by-wire steering system comprises a touch feedback device, a steering control valve, a steering mechanism, a steering angle sensor, a vehicle speed sensor and a controller. The touch feedback device is arranged on the lower portion of the steering wheel, connected with the controller through a CAN bus and used for detecting the rotation angle of the steering wheel and sending a generated rotation angle signal to the controller; the steering control valve is connected with the signal input end of the steering mechanism through a signal line and connected with the controller through a CAN bus, and an output port of the steering control valve is connected with the steering mechanism through a pipeline, receives control signals of the controller and outputs hydraulic flow to the steering mechanism. And the controller forms a control signal according to the deflection angle signal and the driving speed signal. The invention further discloses a mining dump truck and a steer-by-wire method. A hydraulic physical pipeline between the steering wheel and the steering valve is omitted, and steering is achieved in a drive-by-wire mode.

This electric power steering device (20) comprises a motor (22B), a speed reducer (22C), and a steering gear box (22A). The steering gear box has an input shaft (61) and a first housing (41). The speed reducer has first to fourth gears (51-54), a second housing (42), and a third housing (43). The first gear is coupled to a motor shaft (22B1) and rotates about a first axis (O1), the second gear and the third gear are coaxially coupled and rotate about a second axis (O2), and the fourth gear is coupled to an axial end of the input shaft and rotates about a third axis (O3). The relative positions of the first axis (O1) and the third axis (O3) are determined by attaching the motor (22B) and the first housing (41) to the second housing (42) from the same attachment direction in the axial direction of the input shaft.

An electro-hydraulic steering system (1) comprises a hydraulic steering actuator (11) and a hydro-mechanical steering unit (6) for actuating the hydraulic steering actuator in response to a steering demand from a steering wheel (2) connected to the hydro-mechanical steering unit by a steering shaft (3). An electric motor (5) is operative to apply a torque to the steering shaft and is controlled to provide a haptic steering torque feedback to a user through the steering wheel. The motor (5) is controlled to provide haptic steering torque feedback during a dead band range of movement of the steering member (2) before the hydro-mechanical steering unit begins supplying fluid to the steering actuator. The motor (5) may be controlled to provide a haptic steering torque feedback that follows a predetermined profile compensating for the effects of a spring in the hydro-mechanical steering unit which opposes movement of the steering member.

The present disclosure relates to an electric drive module, a chassis platform and a wheeled transport machine wherein the electric drive module is for a chassis platform of a wheeled transport machine, the chassis platform comprising a frame and at least one pair of identical electric drive modules connected to the frame, each electric drive module configured to independently drive one wheel of the wheeled transport machine, each electric driving module comprises a driving assembly, a steering assembly and a suspension assembly, and the driving assemblies are constructed to be connected between the frame and the wheels so as to drive the wheels to rotate; the steering assembly is configured to be connected between the frame and the wheels so as to drive the wheels to steer; the suspension assembly is configured to be connected between the frame and the steering assembly. The chassis platform comprises at least one pair of the electric driving modules. The wheel type transportation machine comprises the electric driving module or the chassis platform.

A mining dump truck steer-by-wire control system based on a state machine comprises the following steps that (1) a steering controller SCU receives data of a sensor and a vehicle control unit VCU through a sensor data processing layer and a CAN message analysis layer; (2) the steering controller SCU integrates the input data in the first step and submits the input data to a fault processing layer for screening; (3) the input data and the fault data are integrated and submitted to a state machine module for working mode switching; (4) the steering controller SCU executes the control strategy of the current steering mode, and calculation and output are carried out; (5) the output control layer sends output data to an execution mechanism to drive a steering wheel; and (6) the steering controller SCU feeds back the state information of the current system to a CAN message coding layer for message coding through a state feedback layer, and finally sends the state information to a vehicle control unit VCU.

The utility model provides a mining dump truck steering mechanism which comprises a front axle steering assembly and a hydraulic system and further comprises a rear wheel steering assembly arranged on a rear axle, the rear wheel steering assembly comprises a rear steering knuckle and a rear steering driving mechanism, and the rear steering driving mechanism is hinged to the rear steering knuckle. The two ends of the rear axle are connected with the rear knuckle through a steering fork, and a transmission universal shaft in power connection with the rear axle driving shaft and the rear brake drum is arranged in the middle of the steering fork. The rear steering driving mechanism serves as a power source for steering of the rear wheels, the transmission universal shaft penetrating through one end of the steering fork and connected with the rear axle driving shaft through the spline is arranged in the middle of the steering fork, connected with the rear brake drum, of the rear axle, and the steering function is added while transmission is achieved. The rear steering driving mechanism is hinged to the rear steering knuckle, so that steering of the rear wheels is achieved instead of rotation of the rear axle, abrasion of the rear wheels during steering can be greatly reduced, and the service life of tires is prolonged.

The invention discloses an electric steering pump integrated with a high-low pressure controller for a new energy vehicle, a system and a redundancy control method. The electric steering pump comprises a double-winding motor, a hydraulic steering pump, the high-pressure controller, the low-pressure controller, a sensor and a power actuator. A high-voltage winding and a low-voltage winding are integrated in the double-winding motor; the double-winding motor is connected with the hydraulic steering pump, the high-voltage controller is connected with the high-voltage winding, the low-voltage controller is connected with the low-voltage winding, and compared with the prior art, triple criteria of voltage deviation, current change rate and temperature are fused, so that the fault false alarm rate is effectively reduced; and a torque smoothing algorithm based on an S-shaped transition curve is adopted, so that dual-mode seamless switching control is realized, and the response efficiency is improved.

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 belongs to the technical field of hydraulic control, and particularly relates to a steering mechanism, a control method of the steering mechanism and an operation machine.The steering mechanism comprises an axle, a steering wheel and a hydraulic control system, and the hydraulic control system comprises a power-assisted steering oil cylinder used for driving the axle to execute steering operation; the oil supply path is used for supplying oil to the power-assisted steering oil cylinder; the electric control reversing valve is arranged on the oil supply way, and two working oil ports of the electric control reversing valve are communicated with a rod cavity and a rodless cavity of the power-assisted steering oil cylinder respectively; the control unit is in communication connection with the electric control reversing valve and is configured to determine the turning angle of an axle under the condition that it is determined that the driver does not place the two hands on a steering wheel; and the working position of the electric control reversing valve is switched according to the turning angle, so that the power-assisted steering oil cylinder drives the axle to return, and the steering wheel is driven to return. By the adoption of the steering mechanism, when the two hands of a driver leave the steering wheel, the power-assisted steering oil cylinder can be automatically controlled to drive the axle and the steering wheel to return.

A mechatronic system for stable operation of a narrow-enclosed vehicle is disclosed. The system comprises of a pair of coaxial planetary gear sets comprising a sun gear (101, 201), a carrier (102, 202), a planet gear (103, 203), and a ring gear (104, 204). A tilt subsystem (105) driven by the rotational motion of the ring gears (104, 204) to adjust the tilt angle of the narrow-enclosed vehicle and a steering subsystem (205) connected to an output shaft (200) and configured to steer the narrow-enclosed vehicle. Further, a first holding device (150), a second holding device (250) and a third holding device (53) are selectively engageable to control the rotational motion of the ring gears (104, 204) and the carriers (102, 202). An electric motor (51) is controlled by an electric control unit (52) to provide torque for adjusting the tilt and steering of the narrow-enclosed vehicle and an actuator subsystem (54) is controlled by the electronic control unit (52) to engage or disengage the first holding device (150), the second holding device (250) and third holding device (53), thus enhancing the vehicle's stability and maneuverability.

A low-speed, large-scale, side-unloading mining dump truck capable of lateral travel. The dump truck comprises wheels, a cargo compartment, a chassis, a cab, an engine, and a driving transmission mechanism. Two axles are mounted on a single support, a turntable is installed at the upper end of the support and is connected to the chassis, and the axles, the support, the turntable, and wheels form a support unit that enables angle adjustment of the wheels relative to the chassis. A plurality of support units are arranged and mounted on two sides of the chassis. A drive mechanism for synchronously rotating the supporting units and a driving transmission mechanism for the whole vehicle are mounted on the chassis. A plurality of hydraulic cylinders for sideward tilting and lifting of the cargo compartment are installed between a lateral middle part of the chassis and a lateral middle part of the cargo compartment. Hinge mechanisms are provided on two sides of the cargo compartment and the chassis, and configured to alternately hinge and unhinge the cargo compartment relative to the chassis. The beneficial effects of the present invention lie in overcoming the challenge of side unloading for a dump truck and removing constraints on the length and width of the vehicle compartment of the dump truck.

The utility model discloses a 16-wheel desert drilling machine integral moving and transporting system capable of steering independently, which comprises a plurality of groups of moving and transporting modules uniformly distributed along the periphery of a drilling machine base, each group of moving and transporting modules comprises a gooseneck frame with a heavy frame structure, the front end of each gooseneck frame is hinged with the end part of the drilling machine base through a pin shaft, and the tail end of each gooseneck frame is hinged with an axle system through a pin shaft; the axle system comprises a middle longitudinal beam which is located in the center of the sub-moving module and arranged in the longitudinal direction, the front end and the rear end of the middle longitudinal beam are each provided with a set of axle steering frames, and steering driving columns penetrating through the middle longitudinal beam are connected to the middles of the axle steering frames in a welded mode; the bottoms of the two ends of the axle bogie are connected with the parallel loading axle through hoops and end plates, and rims and tires are assembled at the two ends of the parallel loading axle. By controlling the steering hydraulic cylinder, the included angle of the tires can be adjusted, and then the turning radius of the moving and transporting system can be accurately controlled to adapt to different road condition requirements.