Provided is a water detection system and an electric power steering apparatus capable of preventing or reducing complication of an apparatus with respect to a water detection system including a water detection element and a determination circuit positioned separately from each other. The water detection system includes a transmission-side unit provided in an apparatus mounted on a vehicle of the electric power steering apparatus and including a water detection element, and a reception-side unit spaced apart from the transmission-side unit and including a determination circuit. The transmission-side unit wirelessly transmits an output signal of the water detection element, and the reception-side unit receives the output signal wirelessly transmitted from the transmission-side unit.

An electric power steering system includes a rack housing configured to accommodate a rack shaft, a pinion shaft meshed with the rack shaft, a speed-reducer including a worm wheel connected to a portion of the second pinion shaft protruding from the rack housing, a speed-reducer housing configured to accommodate the speed-reducer, and a seal member having an annular shape. The seal member is disposed closer to the second pinion gear than the worm wheel is, in the speed-reducer housing. The sear member seals a clearance between the second pinion shaft and the speed-reducer housing.

An electric power steering system includes a rack housing configured to accommodate a rack shaft, a pinion shaft meshed with the rack shaft, a speed-reducer including a worm wheel connected to a portion of the second pinion shaft protruding from the rack housing, a speed-reducer housing configured to accommodate the speed-reducer, and a seal member having an annular shape. The seal member is disposed closer to the second pinion gear than the worm wheel is, in the speed-reducer housing. The sear member seals a clearance between the second pinion shaft and the speed-reducer housing.

A ball screw device and a steering system that include a retainer having more uniform stiffness are provided. Between a rack shaft and a ball screw nut, a cylindrical retainer having a plurality of retainer grooves that retain balls in a rollable manner is provided. Each retainer groove has two short inner surfaces that intersect the extending direction of the retainer groove and two long inner surfaces that intersect these short inner surfaces and extend along the extending direction of the retainer groove. In each of interior-angle portions where the short inner surfaces and the long inner surfaces intersect, a corner round surface is formed. The radius of the corner round surface is set to be smaller than one half of the width of the retainer groove.

A steering wheel arrangement 1 is described comprising a steering wheel (2) having a rim (3) and a steering column 4 rotatably supported in the housing (5) and connected to the rim (3), wherein an electric machine (9, 13, 14) is operatively connected to the steering wheel (2). Such a steering wheel arrangement should be able to produce a force feedback to a traditional steering wheel in a reliable low-cost solution with a high functional safety rating. To this end electric machine (9, 13, 14) is integrated in the rim (3).

An apparatus for controlling a rotary electric machine includes: first and second inverters corresponding to first and second winding groups; first and second voltage detectors; and first and second control units. Each of the first and second inverters includes plurality of switching elements. The first and second voltage detectors each detects input voltage of corresponding inverter. The first control unit limits a first current command value of the first winding group, when both of the first and second inverter input voltages are in normal, and a first differential value is larger than a determination threshold, and the second control unit limits a second current command value of the second winding group, when both of the first and second inverter input voltages are normal, and a second differential value is larger than the determination threshold.

An embodiment of a control system includes a current command module configured to receive a torque command and output a current command for controlling a direct current (DC) motor, and a supply current limiting module configured to receive a supply current limit as an input and actively compute a motor current limit based on the supply current limit, the supply current limiting module configured to limit the current command based on the motor current limit.

A vehicle steering device includes: steering reaction force generation device having a steering wheel and a steering reaction force motor; steering reaction force motor resolver for detecting steering angle; turning device having a steering motor and capable of turning steered wheels, in a state being mechanically disconnected from the steering reaction force generation device; steering motor resolver for detecting turning angle; drive control section for performing drive control of the steering motor; and vehicle speed sensor for detecting the vehicle speed of vehicle. The drive control section performs drive control of the steering motor if vehicle speed exceeds vehicle speed threshold for the first time after ignition switch is turned on and if specific phase shift based on type and magnitude of phase shift occurs.

A driving support device includes: a trajectory deriving unit configured to derive a reference trajectory in a predetermined section corresponding to a predetermined curve shape; a frequency deriving unit configured to derive a first frequency which is determined according to a frequency component of a steering angle of a vehicle when it is assumed that the vehicle has passed through the predetermined section along the reference trajectory; a detection value acquiring unit configured to acquire a detection value of the steering angle; a component deriving unit configured to derive a frequency component of the steering angle acquired in the predetermined section when the vehicle has passed through the predetermined section; and a driving support unit configured to determine a driving support operation for a driver of the vehicle on the basis of a result of comparison between an integrated value of the frequency component in a first band equal to or greater than the first frequency and equal to or less than a second frequency and a first reference value.

A movable object includes: a steering part including a wheel provided to rotate along a ground, a wheel rod connected to the wheel and extending in a direction away from the wheel, and a steering motor connected to the wheel rod to rotate the wheel rod and steer the wheel; and a cover part disposed on top of the steering part, and including a receiving member in which a portion of the steering part is received. When the steering motor rotates the wheel rod in one direction, the steering part is engaged with the receiving member so that the steering part and the cover part may be joined, and when the steering motor rotates the wheel rod in an opposite direction, the steering part is separated from the receiving member so that the steering part and the cover part may be disengaged.