Abstract: A method for determining parallel lift feedforward control of a bucket of a work vehicle is provided. The method includes calculating a current stroke length of a bucket cylinder at a current moment based on a current bell crank plate angle and a current boom angle. The method includes predicting a future boom angle after a certain number of steps. The method further includes calculating a required bell crank plate angle from a learned cutting edge angle and the future boom angle. The method even further includes calculating a future stroke length of the bucket cylinder after the certain number of steps. The method yet further includes calculating an average speed command for bucket control based on the current stroke length and the future stroke length of the bucket cylinder. The method still further includes calculating a bucket cylinder control command based on the average speed command for bucket control.

Abstract: An optical fiber switching device includes a holding base, a threaded axle and two guide spindles installed in the holding base, a motor connected with the threaded axle to drive the threaded axle to rotate, and a positioning block meshed with the threaded axle and supported by the two guide spindles. When the motor is actuated, the positioning block is linearly moved along the threaded axle and kept in balance, thus a first collimating lens disposed on the positioning block is able to be precisely aligned with a second collimating lens which is disposed at a side of the holding base. Because the first collimating lens and the second collimating lens are precisely in alignment, any possible insertion loss of the optical fiber switching device is minimized.

Abstract: An optical fiber switching device includes a holding base, a threaded axle and two guide spindles installed in the holding base, a motor connected with the threaded axle to drive the threaded axle to rotate, and a positioning block meshed with the threaded axle and supported by the two guide spindles. When the motor is actuated, the positioning block is linearly moved along the threaded axle and kept in balance, thus a first collimating lens disposed on the positioning block is able to be precisely aligned with a second collimating lens which is disposed at a side of the holding base. Because the first collimating lens and the second collimating lens are precisely in alignment, any possible insertion loss of the optical fiber switching device is minimized.