Novel steering mechanism capable of realizing partial steer-by-wire function and control method thereof

Abstract

The invention discloses a novel steering mechanism capable of realizing partial steer-by-wire function. The novel steering mechanism comprises a steering wheel, an electromagnetic contracting brake, asun gear, a plurality of planetary gears, a gear ring, a planetary carrier, a worm and a decoupling driving mechanism, wherein the steering wheel is fixedly connected with a steering column; the electromagnetic contracting brake is coaxially and fixedly connected with the steering column; the sun gear is coaxially and fixedly connected with the electromagnetic contracting brake; the planetary gears are circumferentially and uniformly arranged on the outer side of the sun gear and are in meshed transmission with the sun gear; the gear ring is arranged concentric with the sun gear, the inner ring is in meshed transmission with the planetary gears, and the outer ring is provided with worm gear teeth; the planetary carrier is rotationally connected with gear shafts of the planetary gears in the circumferential direction, and a tubular column structure vertically extends from the center of one side, away from the steering wheel, of the planetary carrier and is used for being connected witha steering gear; the worm is in meshed transmission with the worm gear teeth of the outer ring of the gear ring; and the decoupling driving mechanism is connected with the worm and is used for driving the worm to rotate. A control method of the novel steering mechanism capable of realizing the partial steer-by-wire function is further provided.

Description

technical field [0001] The invention relates to the technical field of automobile steering, and more specifically, the invention relates to a novel steering mechanism and a control method thereof. Background technique [0002] In the design of automobile steering system, the vehicle requires the steering system to operate "sensitively" under low-speed conditions, that is, a larger wheel steering angle can be obtained by turning a small steering wheel angle; while the opposite is true under high-speed conditions. Most of the models now use a mechanical steering system with power assist. Once such a system is designed, the angular transmission ratio of the steering system cannot be changed, which is inconsistent with the actual driving needs. In order to balance the two contradictory requirements, the German BMW company uses the AFS active steering technology based on the double planetary row, which can realize the real-time adjustment of the angular transmission ratio of the ...

AI Technical Summary

Problems solved by technology

The realization of this function requires the decoupling of the steering wheel angle and the wheel angle. At this stage, only the steering-by-wire system can realize it. However, as mentioned above, the shortcomings of the current steering-by-wire system are very obvious.

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