437results 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.

The invention provides an electric motor car differential steeling control method based on slip rate control. The method comprises the following steps of: (1) measuring the back wheel speed of the electric motor car, the actual output torque of a drive motor and the side speed of the car according to a wheel sped sensor; and (2) calculating the side speed and the heading angle peed of the electric motor car according to two freedom steering models, and then calculating the slip angles of four wheels, thereby calculating the rotational speed of the four wheels; and using a special arithmetic to realize the control on the electric differential steeling of a hub electric motor car. The electric motor car differential steeling control method based on slip rate control combines the calculation of torque distribution with the slip rate of the wheels to lead a designed electric differential steeling mechanism to have the effect of differential lock simultaneously when having the differential and also have the functions of reducing the speed and increasing the torque, thus greatly improving the running trafficability characteristic and the steering performance of the electric motor car, not only achieving the effect of a mechanical differential mechanism on the aspect of function, but also improving the transmission efficiency and reducing the complexity of a mechanical system.

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 provides a difference active steering system of an electric wheel driving automobile and a difference active steering control method. The difference active steering system consists of a left steering electric wheel, a right steering electric wheel, a difference active steering mechanism and a difference active steering control system; the difference active steering control method uses a steering angle of the steering electric wheels and a vehicle speed dual PID (proportion integration differentiation) control arithmetic to determine target values of the torques of left and righthub electric motors in the left and right steering electric wheels. The novel steering method provided by the invention is applied to the vehicle having a steering mechanism; each steering electric wheel rotates around respective main pin to form a coordinated steering angle according to the driving force difference of the left and right steering electric wheels and the limitation of a trapezoidal steering mechanism, so that the vehicle is steered; and the active steering mechanism is simple and has steering energy consumption.

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.

To improve steering operability in a driver's seat, and to improve posture maintaining capability at the time of turning in the driver's seat and a seat other than the driver's seat. In a vehicle seat including a seat, a seat backrest, and a headrest, the seat backrest has a seat backrest frame formed in a frame shape and a net disposed to stretch in the seat backrest frame. The net has a first string portion arranged radially.

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.

Apparatus, computer readable medium, and program code for identifying rock properties in real-time during drilling, are provided. An example of an embodiment of such an apparatus includes a downhole sensor subassembly connected between a drill bit and a drill string, acoustic sensors operably coupled to a downhole data interface, and a surface computer operably coupled to the downhole data interface. The computer can include a petrophysical properties analyzing program configured or otherwise adapted to perform various operations including 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 acoustic sensor data into the frequency domain, filtering the transformed data, deriving a plurality of acoustic characteristics from the filtered data and 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.

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.

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.

Apparatus, computer readable medium, and program code for identifying rock properties in real-time during drilling, are provided. An example of an embodiment of such an apparatus includes a downhole sensor subassembly connected between a drill bit and a drill string, acoustic sensors operably coupled to a downhole processor, a borehole telemetry system, downhole and surface data transmitting interfaces, and a surface computer operably coupled to the downhole data transmitting interface. The downhole processor is adapted to perform operations including receiving raw acoustic sensor data resulting from rotational contact of the drill bit with rock, transforming the raw acoustic sensor data into the frequency domain, filtering the transformed data, and deriving acoustic characteristics from the filtered data. The surface computer is adapted to perform operations including deriving petrophysical properties from the acoustic characteristics directly or by utilizing a petrophysical properties evaluation algorithm.

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 relates to an acidification diverter composition which is used for enhancing the acidification effect of a non-homogeneous oil-gas reservoir. The acidification diverter composition basically comprises the following components: (A) 40-50 wt% of additive for controlling the viscosity of diverted acid; (B) 48-60 wt% of cosolvent; (C) 2-5 wt% of additive for adjusting the position of peak viscosity of the diverted acid; and (D) 0-5 wt% of additive for improving temperature resistance. Since the viscosity of the diverted acid based on the composition is sensitive to the concentration of HCl (hydrogen chloride), the concentration of HCl required when the peak viscosity is reached is adjustable, and the viscosity can reach the maximum value under a higher HCl concentration and then gradually reduced to be lower than 10mPa.s with the decrease of the HCl concentration, therefore flowback can be realized without additional gel breaker reacted acid.

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 an automobile hydraulic variable-transmission-ratio steering system and a multi-objective optimization method thereof. The automobile hydraulic variable-transmission-ratio steering system comprises a mechanical transmission module, a hydraulic power assisted module, a variable transmission ratio module and a main control module. Aiming at the automobile hydraulic variable-transmission-ratio steering system, mechanical structure parameters and hydraulic parameters which have a great influence on steering performance are selected as optimizing variables, and optimizing objectives are the steering road feel and energy consumption of the steering system; and under the constraint condition of steering sensitivity, multi-objective optimization is conducted through the NSGA-II genetic algorithm of the proposed mixed niche group sharing technology. According to the hydraulic variable-transmission-ratio steering system, the transmission ratio of the steering system can be adjusted according to the automobile travelling working condition, and the characteristics of flexible steering in a low speed and stable steering in a high speed are achieved. After the key parameters of the system are optimized, under the situation of guaranteeing the automobile travelling stability, the good steering road feel can be obtained, meanwhile, the energy consumption of the system is reduced, and the good comprehensive steering performance is obtained.

The invention relates to a drive-by-wire differential steering system and method for a distributed driving electric vehicle. The drive-by-wire differential steering system for the distributed driving electric vehicle comprises a detection module, a drive-by-wire differential steering control module and a steering executing module, wherein the detection module is used for detecting running parameters; the drive-by-wire differential steering control module is used for obtaining target output torques of a front axle driving motor and a front axle right driving motor and transmitting a motor control signal; and the steering executing module is used for realizing differential steering of the electric vehicle. The drive-by-wire differential steering method for the distributed driving electric vehicle comprises the steps that a vehicle controller obtains the running speed of the electric vehicle; the drive-by-wire differential steering controller calculates according to a steering angle of a steering wheel and the running speed to obtain a front axle differential torque of the electric vehicle; the vehicle controller calculates to obtain a front wheel driving motor target torque; the drive-by-wire differential steering controller respectively obtains target output torques of a left front wheel and a right front wheel through calculation; and a motor controller controls a driving motor and a steering executing component to move and also controls a steering wheel aligning moment motor to output moment. Compared with the prior art, the drive-by-wire differential steering system for the distributed driving electric vehicle has the advantages of simple structure, accurate steering and so on.

The invention discloses a coordination control system of a four-wheel independent drive and independent steering electric automobile. The coordination control system comprises a global signal feedback module, an entire vehicle control module, a coordination control module and a motor control module which are connected in sequence, wherein the entire vehicle control module comprises an entire vehicle controller, and a battery management system, a vehicle-mounted lighting device and a refrigerating and heating device which are connected with the entire vehicle controller. Since the coordination controller is arranged, over-complex design of the entire vehicle controller can be avoided, and the real-time response speed and the operation reliability of the entire vehicle controller, the coordination controller and the motor controller are improved. The energy utilization efficiency and the driving comfort of the four-wheel independent drive and independent steering electric automobile are improved by the coordination controller, and the safety in running is improved. A more scientific modular control is realized, the modular production of the electric automobile is facilitated, and the technical innovation of an electric automobile controller manufacturer is promoted, so that the development of the entire electric automobile industry is promoted.

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.

In an outboard motor steering control system having a plurality of outboard motors each mounted on a stern of a boat by a shaft to be movable by an outboard motor actuator relative to the boat and each having an internal combustion engine and a propeller powered by the engine to propel the boat, a tie-bar motor (actuator) is operated such that the outboard motors can be finely operated synchronously to make desired steering angles finely, i.e., to achieve the desired steering angles in response to a detected rotation angle of a steering wheel. Also outboard motor actuators are individually operated to regulate the relative angles between the outboard motors, thereby enhancing both straight course-holding performance and turning performance.

The invention provides a follow-up control method of a vehicle rear axle electronically controlled steering wheel which is used for controlling electro-hydraulic proportional valves for driving the rotation of each rear axle steering wheel. The method comprises the following steps: detecting the actual intersection angle value of a following object and calculating the variable quantity of the following object intersection angle; and judging whether the intersection angle variable quantity is out of the range of the preset dead zone or not, if so, adding a preset modulation parameter to the control parameter which is used for driving and controlling corresponding controlled objects to modify the driving and controlling signals. The core of the invention lies in that the variable quantity ofthe following object intersection angle is utilized to judge whether the follow-up control of each rear axle is started or not, and the driving and controlling signals are modified by adding the preset modulation parameter on the basis of the original control parameter, thus effectively solving the problems of less follow-up control parameter and follow-up startup hysterisis of rear axle steeringwheel in traditional control method. On the basis, the invention also provides a follow-up control system of the vehicle rear axle electronically controlled steering wheel.