183 results about "Brake torque" patented technology

This invention discloses a braking strategy control system for electric tractor-trailers, comprising a human-vehicle-road integrated information acquisition module, a characterization factor calculation module, an electric tractor-trailer required braking torque calculation module, and a braking strategy determination module. The purpose of this invention is to control the braking strategy of the electric tractor-trailer during operation through these modules.

The utility model belongs to torque detection technical field especially relates to single body brake torque detection device, wherein a kind of single body brake torque detection device, comprising: fixed seat, it is provided with torque detection mechanism;Wherein, the torque detection mechanism includes: double-row bearing;Center shaft, pass in double-row bearing inner ring, and upper end is fixed with brake drum, and double-row bearing and center shaft form coaxial transmission pair, torque sensing unit, set in the lower end portion of center shaft;Several positioning columns, are uniformly distributed on fixed seat around center shaft, and cooperate with the bottom groove of brake to limit;Through the precision cooperation of double-row bearing and center shaft, the problem of brake and detection tool misregistration is completely solved;And elbow clamp can realize single hand operation, shorten brake replacement detection time, improve work efficiency.

The application discloses a vehicle control method and device. The method comprises the following steps: determining a speed interval in which an actual speed of a motor is located according to a current gear of a vehicle; determining a current electric torque of the motor according to an electric torque boundary value and a speed boundary value corresponding to the speed interval in which the actual speed is located, and determining a current braking torque of the motor according to a braking torque boundary value and a speed boundary value corresponding to the speed interval in which the actual speed is located; when a brake pedal of the vehicle is released, determining a current acceleration of the motor according to an acceleration boundary value and a speed boundary value corresponding to the speed interval in which the actual speed is located, and determining a current deceleration of the motor according to a deceleration boundary value and a speed boundary value corresponding to the speed interval in which the actual speed is located; and controlling the motor to operate according to the current electric torque and the current acceleration or according to the current braking torque and the current deceleration, so as to control the vehicle to operate. The technical scheme of the application improves the accuracy of vehicle control.

A lift device and a method of controlling the lift device are provided. The lift device has an electric motor drivingly coupled to a traction device, and a traction battery. A hydraulic circuit has a pump with a pump motor, and a valve. In response to a voltage being above a threshold voltage while the electric motor is outputting a braking torque and providing electrical power to the battery, flow of the pump is increased and the valve is controlled to reduce a size of the valve opening and increase pressure in the pressure galley thereby reducing electrical power to the traction battery. The flow of the pump and the valve position are therefore controlled in response to a braking power output being greater than a threshold to dissipate braking power output into the hydraulic circuit and charge the traction battery with the remaining braking power output.

Method for estimating the coefficient of friction of a hydraulic brake system with axle-specific pressure build-up of a motor vehicle, comprising the steps: a) Adjusting a braking torque on a wheel of a first axle or on a first axle of the motor vehicle via an actuator system which has a higher positioning accuracy than the hydraulic braking system; b) Measurement of the deceleration of the wheel or axle or motor vehicle caused by the braking torque; c) Determination of the transmission behavior between braking torque and deceleration of the wheel or axle or motor vehicle; d) Applying a target braking torque to the wheel or axle of the motor vehicle via the hydraulic braking system; e) Measurement of the deceleration of the wheel or axle or motor vehicle caused by the braking torque; f) Estimating the actual braking torque via the inverse of the transmission behavior between braking torque and deceleration of the wheel or axle or motor vehicle determined in step c); (g) Calculation of the coefficient of friction of the hydraulic brake system with axle-specific pressure build-up for the first axle of the motor vehicle, wherein the method also includes the determination of the coefficient of friction of the hydraulic brake system with axle-specific pressure build-up for at least one further axle of the motor vehicle.

The invention relates to a drive brake unit (1) comprising a friction brake unit (2) and an electric machine integrated for driving a wheel of a vehicle. The friction brake unit (2) comprises a brake actuating unit (4, 5) for generating a brake torque. The drive brake unit (1) comprises a stator carrier (6) on which a drive stator is fastened. The drive brake unit further has a vehicle coupling element (7) comprising at least one vehicle coupling geometry (12). The object is to provide an improved component connection scheme for a drive brake unit. To this end, the vehicle coupling element (7) is connected with the stator carrier (6) and the wheel hub bearing (9) of the drive brake unit (1) by at least one first fastening means (10). Furthermore, the vehicle coupling element (7) is connected with the brake actuating unit (4, 5) by at least one second fastening means (11). The invention further relates to a vehicle comprising at least two drive brake units (1) of the aforementioned type.

This invention discloses an electromechanical braking system and its control method based on heterogeneous motor redundancy, relating to the field of brake-by-wire technology for new energy vehicles. The system includes the following steps: During vehicle braking, a permanent magnet synchronous motor (PMSM) acts as the main drive source, outputting braking torque, while a switched reluctance motor (SRM) operates in standby or low-power auxiliary mode, forming a heterogeneous motor redundant drive structure. This invention achieves complementary failure modes and reduces the risk of common-mode failures by employing a heterogeneous redundancy structure of a PMSM and a SRM; simultaneously, it optimizes system economy by utilizing the low cost and low standby energy consumption characteristics of the SRM. A deep learning health prediction model is introduced to achieve early fault prediction and proactive switching, and a rapid, seamless switching mechanism within 20ms ensures braking continuity and system safety.

A control device includes a switching control unit, an information acquisition unit, and a difference acquisition unit. The switching control unit performs switching control that increases braking torque of the braking device while decreasing braking torque of the rotating electrical machine, when a vehicle is decelerated. The information acquisition unit acquires information on a state of the vehicle. The difference acquisition unit acquires a braking torque difference indicating a difference between braking torque required for keeping a stopped state of the vehicle and braking torque of the braking device, when the vehicle is stopped. After the information acquisition unit detects the stopped state of the vehicle, the switching control unit corrects output torque of the rotating electrical machine based on the braking torque difference.

A brake apparatus includes brake modules on the left and right wheels of the first and second axles and a controller that sets a target braking torque for each wheel based on a pedal sensor signal and controls each module accordingly, and, upon detecting a failure in one or more brake modules, identifies a yaw rate error between the target and current yaw rates using a motion sensor signal, distributes additional braking torque to the operational modules based on the yaw rate error, and adjusts their braking torque based on both the target and additional values.

The application provides a kind of based on reinforcement learning's line control brake system electromechanical compound brake smoothness control method, this method includes the following steps: obtaining the current operating state data of vehicle and constructing state space vector;State space vector is composed of sliding window state sequence, input to the reinforcement learning intelligent agent model pre-trained, output basic distribution proportion coefficient;Target total brake torque is analyzed into target motor brake torque and target line control friction brake torque;In the transition window period of dynamic handover of motor brake and line control brake, the dynamic error between target deceleration and actual longitudinal deceleration is calculated in real time;When dynamic error is greater than zero and exceeds preset dead zone threshold, generate transient compensation torque instruction and send to motor controller, so that the actual output torque of drive motor is the sum of target motor brake torque and transient compensation torque.The application realizes the continuous smooth transition of vehicle braking force in brake mode dynamic switching process.

The invention relates to a system and a method for coordinating drive and / or braking torques in a motor vehicle with selected interfaces for communication between processing modules.

The invention relates to a braking device (200) for generating a total braking torque for a vehicle (42), comprising: an eddy current braking device (10), an energy storage device (24), and an electric machine (46, 48) connected to the energy storage device (24). The eddy current braking device (10) has a stator part (12), a rotor part (16) rotatably arranged relative to the stator part (12) about an axis of rotation (14) with a shaft (18) arranged in the axis of rotation (14), and an actuator device (10, 28, 32). The rotor part and stator part are arranged concentrically to each other with an air gap (20) between them. The stator part (12) includes an excitation device (22) for generating a primary magnetic field.An induction device is designed to induce eddy currents by a magnetic field, thereby generating a first braking torque (120, 122), wherein the actuator device (10, 28, 32) generates a force (30, 34) by means of which the rotor part (16) and stator part (12) are displaced relative to each other, thereby generating contact between the stator part (12) and rotor part (16) and generating a second braking torque (120, 122). The eddy current braking device (10) and / or the electric machine (46, 48) are coupled, at least temporarily, to at least one wheel (44) of the vehicle (42). The invention further relates to a vehicle with such a braking device and to a method for generating a total braking torque.

A drivetrain including a motor, a transmission assembly, and a park brake assembly is provided. The transmission assembly includes a main shaft extending along a central longitudinal axis between a first end and a second end and configured to be driven by the motor. The second end configured to be operably coupled to at least one wheel to drive the at least one wheel. The park brake assembly integrated into the transmission assembly and operably coupled to the first end of the main shaft. The park brake assembly configured to apply a park brake torque at the first end of the main shaft to inhibit rotation of the main shaft and the at least one wheel.

The application discloses a kind of permanent magnet synchronous motor electric shovel speed regulation system and motor control method, belong to mining equipment technical field, including: main transformer, rectification feedback unit, several permanent magnet synchronous motors, several frequency converters and voltage suppressor, by using permanent magnet synchronous motor as power source, the efficiency and power factor of motor in low speed area are higher, realize efficient, energy-saving green mining, electric shovel each mechanism can also adopt direct drive or half direct drive mode, reduce mechanism transmission series, further improve transmission efficiency and equipment reliability;Since the rotor of permanent magnet synchronous motor is permanent magnet, when the frequency converter fails and the brake fails at the same time, the motor will generate back electromotive force when being pulled by potential energy load, according to the power generation characteristics of permanent magnet synchronous motor, the stator is short-circuited through energy consumption device, which will generate braking torque in permanent magnet synchronous motor, so as to brake the bucket, avoid the bucket falling rapidly, electric shovel out of control accident.

The invention relates to a method for controlling an electric traction drive machine of an electric motor vehicle drive, wherein a torque and a rotation speed of the traction drive machine is variably adjusted using a drive converter, in a drive mode of the motor vehicle the traction drive machine is operated as a motor and generates a drive torque by way of which drive wheels of the motor vehicle are driven, in a braking mode of the motor vehicle the traction drive machine is operated as a generator via the drive wheels of the motor vehicle and generates a braking torque by way of which the drive wheels of the motor vehicle are braked; for controlling the rotation speed of the traction drive machine, the current rotation speed of the traction drive machine is detected or calculated and is fed to the drive converter as an actual rotation speed, wherein the actual rotation speed is generated by smoothing the current rotation speed, and in the braking mode the braking torque is adjusted as a function of the actual rotation speed and / or the current vehicle speed. The method according to the invention is characterized in that in the braking mode the braking torque is additionally adjusted as a function of an at least indirectly detected current vehicle deceleration.

This utility model discloses a machine tool spindle clamp torque testing fixture structure, including a base, a brake disc, a positioning shaft, and a machine tool clamp to be tested. A rotating cylinder is rotatably connected to the outer side of the positioning shaft via a bearing. A torque disc is disposed outside the brake disc, and the torque disc and brake disc are axially fixed to the outer end face of the rotating cylinder by a first fastener. When the brake clamp is in operation without air pressure input, the brake disc can be easily rotated by hand. After air pressure is input, the brake clamp clamps the brake disc, which cannot be rotated by hand. By inserting a torque wrench into the inner hole of the torque disc and rotating the wrench, the torque value of the brake disc during rotation can be read. By comparing this torque value with the customer's required torque value, the clamp's qualification can be determined. The braking torque of the brake clamp can be directly tested, preventing defective products from reaching customers and avoiding the scrapping of parts due to insufficient braking torque.

The present application relates to the field of rail vehicle braking technology, and discloses a power actuation control method in rail vehicle braking, comprising: collecting a stator current sequence of a braking torque generation unit, calculating a first-order forward difference value to identify a load stiffness jump characteristic and determine a brake shoe contact position, locking the current effective value corresponding to the brake shoe contact position as a clamping current reference, adjusting the output torque compensation mechanism gap in response to the brake shoe contact position, and locking the integral path in the anti-slip adjustment unloading stage to maintain the stator current at the clamping current reference, wherein the present application uses electromagnetic parameter surface layer mutation to accurately offset the transmission gap of the mechanism, realizes physical quasi-synchronization of the electric command and mechanical action, suppresses the mechanism rollback phenomenon in the anti-slip stage, guarantees the real-time performance of the braking force reconstruction, and shortens the braking response time.

Freefall winds (1), comprising: - a housing (70) and a winch drum (2) rotatably mounted relative to the housing (70) about its axis of rotation (D), - a free-fall brake (100) comprising at least one first brake body (110) and at least one second brake body (120), wherein the at least one first brake body (110) and the at least one second brake body (120) are pressable against each other to achieve a friction-based braking torque, - a gearbox (10) arranged between the winch drum (2) and the free-fall brake (100), which is designed to convert a rotation of the winch drum (2) into a rotation of at least one second brake body (120) relative to the first brake body (110), - a sensor (80) designed to detect a measured value from which the braking torque of the free-fall brake (100) acting between the winch drum (2) and the housing (70) can be determined.

This invention provides a traction machine fault simulation test device, which, for existing traction machine operating conditions, provides testing personnel with a more effective testing scenario in the detection process, simulating brake spring torque decay and brake foreign object obstruction in an off-site manner. The traction machine fault simulation test device includes a brake arm displacement adjustment unit and a braking torque adjustment unit. The brake arm displacement adjustment unit includes a drive mechanism for rotating a rotating shaft that drives the manual release lever of the traction machine brake. The braking torque adjustment unit includes a horizontal linear guide rail parallel to the brake spring axis of the traction machine and a sliding seat mounted on the horizontal linear guide rail that can slide freely. A rotary motor and a first rotating component connected to the power output end of the rotary motor are mounted on the sliding seat. The first rotating component is coaxially arranged with the brake spring and can engage a reaction nut on the outside of the brake spring.

The invention relates to a method for operating a braking system (12) of a motor vehicle (10), which comprises a control unit (14) and at least one friction brake (16), with a first brake element (18) and at least one second brake element (20), which are brought into contact by a pressure acting on them by means of an actuator (22), whereby a braking torque is generated due to friction, which acts on at least one wheel (24) of the motor vehicle (10), and a material is used for the first brake element (18) and / or the at least one second brake element (20) in which the relationship between pressure and braking torque is not linear and the braking torque depends on a vehicle condition. The invention further relates to a braking system (12) and a motor vehicle (10).

The application discloses a test method and test bench for evaluating brake noise of a friction brake, comprising: carrying out brake noise test according to a set working condition, collecting brake torque, working speed and noise signal; obtaining speed-torque mean value characteristics and fluctuation characteristics based on the brake torque and the working speed, obtaining sound pressure level and noise growth rate based on the noise signal; and performing vibration noise performance evaluation based on the speed-torque mean value characteristics, the fluctuation characteristics, the sound pressure level and the noise growth rate. The application realizes collection of brake vibration noise related signals under different working conditions, and can also increase evaluation dimensions of vibration noise behavior based on vibration noise signals in test results, so as to fully reflect current noise performance and vibration stability characteristics of the brake.

This invention provides a vehicle control device capable of determining whether a drive shaft connected to the wheels is twisted. When the rotation of the rotating component connected to the drive shaft is prohibited by the parking lock mechanism (step S1 is Yes), the braking torque applied to the wheels by the braking device is less than or equal to a predetermined torque, and the tilt angle in the vehicle's pitch direction is greater than or equal to a predetermined angle (step S3 is Yes), it is determined that the drive shaft has twisted (step S4), and when the rotation of the rotating component becomes possible by the parking lock mechanism, an auxiliary torque opposite to the direction of drive shaft twist is output from the motor.

The invention relates to a system and a method for coordinating drive and / or braking torques in a motor vehicle, with selected interfaces for communication between processing modules.

A braking system (100) for a vehicle (112) comprises a speed sensor (102), an electromagnetic braking system (108), and a friction braking system (110), and a control unit (106) that is operationally coupled to the electromagnetic braking system (108) and the friction braking system (110). The control unit (106) is configured to: receive a signal from a brake pedal sensor indicating a request to reduce the vehicle's speed; receive the vehicle's (112) speed from the speed sensor (102); compare the vehicle's (112) speed with a predefined speed value; and actuate the electromagnetic braking system (108) or the friction braking system (110), or both, based on the comparison of the vehicle's (112) speed with the predefined speed value.The friction braking system (110) is activated when the braking torque developed by the electromagnetic braking system (108) is less than a calculated value of the required braking torque.

The present application relates to a driver behavior-integrated adaptive energy recovery method for an electric vehicle and a system. The method comprises the following steps: analyzing current traveling data and historical traveling data of a vehicle, determining a driving style, and predicting the probability of the driving style; estimating a vehicle mass on the basis of the current traveling data of the vehicle, and respectively calculating two values of the gradient by means of two different algorithms; setting a weight on the basis of a preset vehicle speed threshold, and weighting the two values to obtain a fused gradient value; and on the basis of the current traveling data of the vehicle, the vehicle mass, the fused gradient value, and the probability of the driving style, respectively determining corresponding correction factors, correcting an initial braking torque corresponding to a current motor speed to obtain a reference braking torque, comparing the reference braking torque with a preset motor torque range, obtaining an optimal braking torque, and performing braking, so as to achieve energy recovery. The present application effectively optimizes the distribution of regenerative braking energy and improves the energy recovery rate.

The present application relates to the technical field of vehicle stability control, in particular to a road adhesion coefficient adaptive electric brake torque limiting method and system. By limiting the electric brake torque in advance according to the real-time road adhesion coefficient, the instability risk caused by the suspension geometry disturbance and the transmission system torque imbalance due to electric brake on low adhesion road is eliminated from the source, and the vehicle stability control is improved from the traditional vehicle body electronic stability system after remedy to prevention, which greatly reduces the probability of side slip and spin accidents. The present application allows to exert the electric brake capacity close to the limit on high adhesion road, and maximizes the energy recovery efficiency. On low adhesion road, the safety is automatically prioritized, and the contradiction between efficiency and safety is intelligently balanced, which solves the core pain point in the promotion of the coordinated regenerative braking system.