An apparatus and method for controlling braking of an electric automobile, which compensate for characteristics of a transmission system by means of adjusting a regenerative braking force of an electric motor and a hydraulic braking force of a hydraulic control system. The apparatus comprises an electric motor torque sensor, an electric motor rotating speed sensor, a wheel rotating speed sensor and a vehicle-mounted braking control system, wherein the vehicle-mounted braking control system comprises a half shaft torque determination module, a backlash state determination module, a backlash compensation control module, an elasticity compensation control module and a control time detection module. A backlash state is determined by means of the backlash state determination module, and according to a backlash state at a gear engagement position in a transmission system, backlash compensation control or elasticity compensation control is carried out on the transmission system by means of the backlash compensation control module or the elasticity compensation control module, so that the risk that a regenerative braking torque impact and vibration at a corresponding wheel caused by backlash and elasticity of the transmission system can be reduced. The present disclosure can be widely applied in the technical field of electric vehicles.

An adjustment device configured to move first bevel gear and second bevel gear that are disposed on base and are meshed with each other. Adjustment device includes first adjustment assembly, and second adjustment assembly. First adjustment assembly includes first fluid-driven power source, first brake component and first displacement sensor. First fluid-driven power source includes first cylinder housing and first piston. First cylinder housing is configured to be disposed on base. First piston is movably disposed on first cylinder housing. First bevel gear is configured to be disposed on first piston. First piston is configured to move first bevel gear along first axial direction. First brake component is configured to be disposed on base and configured to stop or release first piston. First displacement sensor is disposed on first cylinder housing and configured to generate displacement data related to first piston.

A steering mechanism having a piezoelectric element to adjust component clearance and preload based on steering inputs, road inputs, and time in service. The piezoelectric element positioned in the steering mechanism for electric adjustment so that the clearance and preload can be adjusted electrically in response to steering inputs, road inputs, and time in service. This arrangement allows for low preload and low friction when the vehicle is being driven over smooth road conditions. When a rough road condition is detected both clearance and preload can be electrically increased to minimize noise. The disclosed inventive concept may find application in a variety of steering mechanisms to minimize or eliminate NVH when the vehicle is driven over rough surfaces. Without limitation, the piezoelectric element may be provided in rack and pinion electric power assisted steering systems or in worm and wheel (steering column) electric power assisted steering systems.

A controller for a motor vehicle powertrain, the controller being configured to control the amount of torque generated by each of a plurality of drive torque sources in order to generate a net torque corresponding to a predetermined torque demand value, the predetermined torque demand value being determined at least in part by reference to a torque demand signal received by the controller, each drive torque source being coupled via a respective torque transfer arrangement to a respective group of one or more wheels, the controller being configured to cause at least one drive torque source to generate positive or negative torque in dependence on the predetermined torque demand value and to cause the drive torque source to undergo a torque reversal operation in which the direction of torque generated by the at least one drive torque sources changes from one direction to the other, the controller being configured wherein, during a torque reversal operation, the controller limits the rate of change of torque generated by the at least one of the plurality of drive torque sources as the amount of torque generated passes through zero and attempts to compensate for the reduction in rate of change of torque by a corresponding change in the amount of torque generated by one or more other of the plurality of drive torque sources.

Magnetically-assisted mechanical gear systems and other power transmission systems, and related methods of operation and assembly, are disclosed herein. In an example embodiment, such a system includes a driving gear, a driven gear, and a first magnetomotive force (MMF) source that generates a magnetic flux. A first portion of the flux is communicated between at least one driving gear teeth and at least one driven gear teeth so that one or more magnetic forces are exerted between the gears. When the first rotational movement of the driving gear alternates from being in the first rotational direction to being in a third rotational direction opposite the first rotational direction, then the driven gear is driven by the one or more magnetic forces so that the second rotational movement also alternates, and a first amount of backlash movement between the driving and driven gears is avoided or reduced.

The speed reducer includes: a gear housing to enclose a worm wheel and a worm shaft and including one of a first magnetic member and a second magnetic member, which generate attractive force or repulsive force therebetween as current is applied to a position facing the worm shaft in an axial direction; a first bearing coupled to an end of the worm shaft at an opposite side to a motor shaft-coupling portion; and a moving member coupled, at one side thereof, to an outer race of the first bearing and including, at a remaining side thereof, a remaining one of the first and second magnetic members, so that the moving member is axially moved according to the attractive force or the repulsive force.

A controlled or zero backlash gearmotor comprises a main gearmotor, a secondary service gearmotor, an electronic control unit and transmission and synchronization gears. The backslash control results from the cooperation between the main gearmotor, the secondary service gearmotor, and the electronic control unit which adjusts, based on parameters detected by a series of sensors, the load provided by the service gearmotor on one of two irreversible screws pressing on two worm screws, respectively, arranged at the side of a worm wheel. This latter supports a secondary shaft and is get into gear with both the worm screws, the two worm screws being synchronized by means of gears connecting them to each other so that a reversible motion transmission is executable.

Example embodiments include a driving device having: a plurality of vibrating members that may vibrate when the vibrating members are driven; and a holding part that may hold the vibrating members. The holding part may include a first member with which one or more of the vibrating members may be brought into contact, and a second member with which one or more of the vibrating members may be brought into contact. The first member and the second member may be partially coupled to each other. A grounding member for electrically grounding a member held by the holding part may be brought into contact with one of the first member and the second member that is more difficult to vibrate.

A method for controlling a separation between rotational axes of a pair of meshing gears is disclosed. A parameter indicative of a transmission error through the gears is measured and the separation is controlled, aiming to minimise variations in the measured signal. This acts to reduce variations in transmission error and the related vibrations created in the drive system and in the surrounding components. A related drive system and aircraft landing gear are described.

According to an embodiment of the present invention, a torque variation of a servomotor, which is measured in a numerical control apparatus of an existing numerical control machine tool, is observed, and a backlash is detected by calculating a transfer distance of an output shaft of the servomotor at a torque peak, without adding additional positioning detection equipment, thereby detecting an accurate backlash amount without adding additional equipment.