433results about How to "Improve steering performance" patented technology

The invention discloses a torque distribution control method for an electric-wheel automobile hub motor torque distribution system, and belongs to the field of an electric-wheel automobile. The electric-wheel automobile hub motor torque distribution system comprises parts as follows: a driver intention module, a hub motor, a stability controller, a torque distributor, a slip rate controller, a whole automobile module, a pavement information module and a whole automobile sensor module, wherein the stability controller comprises a fine adjustment mode and a stable adjustment mode, and the torque distributor divides whole automobile movement into a dynamic mode, an economical mode and a stable mode. According to the torque distribution control method, a plurality of controlled variables such as the slip rate, attachment coefficient, yaw velocity, side slip angle, hub motor rotating speed and the like are combined to control the automobile, so that stability and dynamic performance of the automobile at the low speed or high speed are guaranteed; and the automobile torque is distributed, so that automobile drive capacity, motor utilization efficiency and whole automobile stability when the automobile is driven normally or has a slipping phenomenon are improved.

A motor drive control apparatus for controlling a motor has a main control part that performs a flux weakening control by a vector control of d-q axes and a rate-limit control part that controls a rate of change in a d axis current command value in the vector control. Further, there is provided a motor control apparatus for controlling a motor has a motor angular speed detection part that detects a motor angular speed of the motor and a motor control part having a current control system that controls the electric motor based on a motor current and a current command value. The motor control part calculate the current command value in which torque becomes constant by considering characteristics of the current control system based on a motor angular speed detected by the motor angular speed detection part.

The invention relates to a sightseeing rail car. The rail is an H-shaped steel rail, each other carriage is only provided with a rear driving axle and a rear driving wheel except the first carriage, the front and rear carriages are lapped and connected by a universal bearing connector, the front steering axle and the rear driving axle are connected with the carriage in a pivoting support mode, a driving motor is arranged at the bottom of every one to three carriages, and a safety pressure rod is arranged on each row of seat. The sightseeing rail car has the characteristics of reasonable structure, running stability, high passenger capacity, low noise, long continuous running time and the like, and is suitable for complex sites with many bends, small radii and slopes in indoor and outdoor sightseeing amusement.

A steering system can be provided for a boat. Such a boat can include a rudder device using an electric actuator to allow a rudder to rotate about a rotational shaft, and a steering wheel 7 for operation by an operator. The steering system can include a steering wheel displacement sensor for detecting the displacement of the steering wheel and a controller for calculating the rotational displacement of the rudder device corresponding to the detected steering wheel displacement and sending an actuation signal to the electric actuator based on the calculated rotational displacement, in which the controller receives a signal indicating an engine speed for producing a propulsive force in the boat, and changes, in accordance with the engine speed, the ratio of the rotational displacement of the rudder relative to the steering wheel displacement.

The invention discloses a combination control system for integration electric power steering and active steering. The combination control system for integration electric power steering and active steering comprises an active steering control system, an electric power steering control system, an adjustment control system based on yaw velocity and an adjustment control system based on steering wheel moment, the active steering control system and the electric power steering control system are respectively connected with a vehicle speed sensor and a steering wheel angle sensor for calculating and processing the inputted vehicle speed and steering wheel angle and outputting the total front wheel angle control signal to the total system for steering the front wheel actively; the adjustment control system based on yaw velocity is used for adjusting the obtained yaw velocity value for having feedback to the active steering control system for amending the front wheel angle control signal; the adjustment control system based on steering wheel moment is used for adjusting the obtained steering wheel moment for having feedback to the electric power steering control system for amending the outputted front wheel angle control signal.

The invention discloses a planet coupled hybrid system for a caterpillar and a control method for the same, and belongs to the technical field of hybrid vehicle drive. The system comprises a generator; the generator is connected with an integrated controller through a generator control unit, a vehicle-mounted battery pack is connected with the integrated controller through a battery management system, and driving motors are connected with the integrated controller through motor controllers; the motor controllers are connected with the vehicle-mounted battery pack; an output shaft of the generator is connected with a central horizontal axis through an electric control clutch and a main reducer in turn; two ends of the central horizontal axis are connected with a gear ring respectively; planet carriers are connected with caterpillar track driving wheels through lateral transmission mechanisms; sun gears are connected with output shafts of the driving motors through gears; the central horizontal axis is provided with a first electric control brake; and the sun gears on the two sides are provided with a second electric control brake and a third electric control brake. According to the control method, the integrated controller calculates vehicle demand power in real time according to a speed feedback signal and an accelerator pedal signal, and detects the remained capacity of the battery to control the switching of work modes of the hybrid system.

Methods of identifying rock properties in real-time during drilling, are provided. An example of such a method includes connecting a downhole sensor subassembly between a drill bit and a drill string, operably coupling acoustic sensors to a downhole data interface, and operably coupling a surface computer to the downhole data interface. The method can also include receiving raw acoustic sensor data generated real-time as a result of rotational contact of the drill bit with rock during drilling, transforming the raw data into the frequency domain, filtering the transformed data, and deriving a plurality of acoustic characteristics from the filtered data. This can be performed by a petrophysical properties analyzing program stored in memory of the computer. The method can also include deriving petrophysical properties from the filtered data utilizing a petrophysical properties evaluation algorithm employable to predict one or more petrophysical properties of rock undergoing drilling.

A catheter system has a balloon angioplasty device disposed about a common lumen near its distal end. The balloon catheter is pre-fitted with a stent which is deployed when the balloon is inflated. The common lumen is in communication with multiple lumens within a proximal region of the catheter body to allow for positioning of the catheter over a movable guide wire and convenient delivery of imaging or interventional devices to a desired region of a body passageway being treated. The procedure for stent deployment optionally includes steps of imaging a lumen by ultrasound before and after stent deployment to identify the site at which a stent is needed, to confirm that the stent is being and has been deployed at a longitudinal position which does not overlap a branched segment of the body passageway, and to ensure that the stent has been radially opened to an optimum diameter.

Methods of identifying rock properties in real-time during drilling, are provided. An example of method includes connecting a downhole sensor subassembly between a drill bit and a drill string, operably coupling acoustic sensors to a downhole processor, operably coupling a borehole telemetry system, downhole and surface data transmitting interfaces, and a surface computer to the downhole data transmitting interface. The method also includes receiving raw acoustic sensor data resulting from rotational contact of the drill bit with rock by the downhole processor, transforming the raw acoustic sensor data into the frequency domain, filtering the transformed data, and deriving acoustic characteristics from the filtered data. The method also includes the surface computer receiving the acoustic characteristics and deriving petrophysical properties from the acoustic characteristics directly or by utilizing a petrophysical properties evaluation algorithm.

Structure for converting a conventional manual steering system of an off-road vehicle to an automatic steering system utilizing remote signals. A stepper motor is connected through a belt or chain drive to a drive mounted on the upper end of a steering shaft. The stepper motor is connected to a microprocessor and moves with the steering shaft in both a manual steering mode and an automatic steering mode. An encoder provides a signal to a microprocessor that changes operation to the manual mode if the number of steps reported by the encoder is different than what is expected. An assembly including alternate steering wheel, shaft pulley, adapter insert and stepper motor is easily connected to the steering column. A drive motor may also be directly connected to the steering shaft.

The invention discloses a railway vehicle and a guiding wheel device used for the railway vehicle. The guiding wheel device comprises a bracket, travelling wheels and at least one guiding wheel pair; the travelling wheels are arranged on the bracket in a pivot mode and supported on railways to move; two guiding wheels of each guiding wheel pair abut against two opposite outer side walls of the railways to move; and each guiding wheel is connected with the bracket in a pivot mode through a corresponding hydraulic cylinder assembly and driven by the hydraulic cylinder assembly to move to adjust the distances between the guiding wheels and the outer side walls of the railways. According to the guiding wheel device used for the railway vehicle of the embodiment of the invention, pressure adjusting between the guiding wheels and the railways can be achieved, and steering performance of the vehicle is improved.

The invention relates to a drive-by-wire differential steering system for a wheel type independent drive vehicle, the system comprising: an information detection module for detecting various state information of the vehicle; a controller used for judging steering modes according to the various kinds of detected state information of the vehicle, including a steer-by-wire mode and a drive-by-wire differential steering mode, deciding target torque required by each motor, and sending corresponding motor control signals; and a steering execution module used for making a corresponding torque response according to the motor control signal so as to drive the steering mechanism to move and realize differential steering of the electric automobile. The invention further discloses a control method ofthe drive-by-wire differential steering system for the wheel type independent drive vehicle. The invention also provides a control method of the drive-by-wire differential steering system for a wheeltype independent drive vehicle. Front axle left and right wheel hub motors serve as steering power sources, so that steering mechanical connection, a steering power assisting device and the like are omitted, the structure of a steering system is simplified, the available space in a vehicle is increased, system integration is easier, and cost is reduced.

The invention provides a drive-by-wire independent steering-driving integrated double wishbone suspension system based on a double crank mechanism. The drive-by-wire independent steering-driving integrated double wishbone suspension system based on the double crank mechanism comprises a wheel steering angle sensor, a worm gear reducer, a servo motor, a bracket, an upper swinging arm, a driving rod, a driving rod ball, a connecting rod, a lower swinging arm, a lower swinging arm ball stud, a hub, a driven rod ball, a steering knuckle, a driven rod, an upper swinging arm ball stud, a PID (Proportion Integration Differentiation) controller and a CAN bus system. The invention is advantaged in that a steering mechanism does not occupy additional space during realizing drive-by-wire four-wheel, the steering error is furthest reduced, the adverse effect of the wheel hop on the working state of a decelerating device when a vehicle runs on a complicated pavement can be effectively decreased, and toe-in interference caused by reverse input can be effectively avoided. As steering wheel signal feedback is also included, the closed-loop control of the system can be realized, accurate steering can be realized and the vehicle steering performance can be very well improved. The excellent effects are extremely helpful for the promotion of the drive-by-wire independent steering-driving integrated double wishbone suspension system in the vehicle industry.

The invention discloses a four-wheel drive vehicle-based moment of force distribution control system. The four-wheel drive vehicle-based moment of force distribution control system comprises an ECU (Electronic Control Unit), wheel rotating speed sensors, a steering wheel rotating angle sensor, a vehicle body speed sensor, a hydraulic control brake, a yaw velocity sensor and an inter-axis electric control limited slip differential, wherein all of the wheel rotating speed sensors, the vehicle body speed sensor, the yaw velocity sensor and the steering wheel rotating angle sensor are connected with the input end of the ECU; both the inter-axis electric control limited slip differential and the hydraulic control brake are connected with the output end of the ECU. According to the four-wheel drive vehicle-based moment of force distribution control system, a vehicle shows high dynamic performance and operating stability after moment of force distribution comprehensive control and inter-axis moment of force distribution control are applied to the vehicle, so that the four-wheel drive vehicle-based moment of force distribution control system has high practicability in the application of improving the traction trafficability, the directional stability or the steering maneuverability of the vehicle.

The invention mainly belongs to the technical field of rotary guide systems, and particularly relates to a full-rotation hydraulic inward-pushing-type high-build-up-rate rotation guide tool. The full-rotation hydraulic inward-pushing-type high-build-up-rate rotation guide tool adopts a hydraulic system driven by a turbine and a generator set to convert the energy of the pressure mud into the hydraulic energy. By adopting the hydraulic system driven by the turbine and the generator set, the power is provided for a piston through the hydraulic mode, so that the lateral force obtained by a drillbit is larger. Meanwhile, the hinged mode is adopted, so that the optimal steering capability is achieved. As a result, the high build-up rate is easier to achieve. The hydraulic piston pushes againstthe inner wall of a lower rotating sleeve instead of the wall of a well, so that the abrasion can be reduced. At the same time, only one set of pushing piston assemblies is pushed out at the same moment, so that the unnecessary work is reduced. The service life of the piston is prolonged.

The invention discloses a load sensitive turning hydraulic system of a loading machine. The load sensitive turning hydraulic system is characterized in that a load sensitive constant pressure variable plunger pump supplies working oil pressure to a flow enlarging valve and a turning machine; a load feedback pressure signal of the flow enlarging valve controls an LS control valve of a first load sensitive constant pressure variable plunger pump; an oil port L of the turning machine is communicated to the right end of a main valve core L of the flow enlarging valve; an oil port R is communicated to the right end of a main valve core R of the flow enlarging valve; the load sensitive constant pressure variable plunger pump supplies the working oil pressure to a load sensitive turning valve and a pilot valve; and four control ends of the pilot valve are respectively communicated with the load sensitive turning valve. The load sensitive turning hydraulic system of the loading machine also comprises a turning system and convergence systems of other working systems. The load sensitive turning hydraulic system of the loading machine has the advantages that the variable displacement function of the load sensitive constant pressure variable plunger pump is fully used, so that the displacement of a turning pump is increased, and the turning performance is improved; and fuel is saved, and the working efficiency is improved. The flow enlarging valve is simple in structure, and domestication is also realized; the cost of the flow enlarging valve is lower than that of an imported flow enlarging valve; and batch production can be realized.