Multifunctional electric recirculating ball steering system of commercial vehicle and control method thereof

Abstract

The invention discloses a multifunctional electric recirculating ball steering system of a commercial vehicle and a control method thereof. The multifunctional electric recirculating ball steering system comprises an electric power module, a mechanical transmission module and a control module; the electric power module comprises a double-rotor motor module and a power assisting motor. The mechanical transmission module comprises a steering wheel, a steering shaft, a coupler, a recirculating ball steering gear, a gear sector, a gear sector shaft, a steering straight pull rod, a steering transverse pull rod, a steering knuckle arm, a left trapezoidal arm, a right trapezoidal arm, a left steering knuckle, a right steering knuckle, a left wheel and a right wheel. The control module comprises an electronic control unit, a torque sensor, a vehicle speed sensor, an angle sensor and a current sensor. According to the invention, the high reduction ratio capability of the recirculating ball steering gear is fully exerted, the power assisted torque of the system is maximized, the electric power assisted function is realized, the system is simplified, and the reliability of the system is ensured while the drive-by-wire function is provided.

Description

technical field [0001] The invention belongs to the technical field of automobile mechanical steering, and specifically refers to a commercial vehicle multifunctional electric recirculating ball steering system and a control method thereof. Background technique [0002] The steering system commonly used in existing commercial vehicles is the Hydraulic Power Steering (HPS) system. Compared with the purely mechanical steering system, the HPS system has the advantages of mature and reliable technology, low cost, and can effectively improve the problem of heavy steering. However, it has high The steering stability is poor at high speeds, and the steering feels heavy at low speeds such as turning around on the spot. In order to solve these problems, domestic and foreign experts and scholars put forward improved electronically controlled hydraulic power steering (ECHPS) system and electrohydraulic power steering (EHPS) system on the basis of HPS system. Although the new technolog...

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a commercial vehicle multifunctional electric recirculating ball steering system and its control method, so as to solve the problems of the commercial vehicle electric power steering with less power and reliable steering by wire in the prior art. Poor performance and the single function of the steering system is difficult to adapt to the future development of the vehicle; the present invention combines the dual-rotor motor and a set of ordinary power-assisted motors to work together on the input end of the recirculating ball steering gear, and utilizes the high redundancy of the dual-rotor motor. The characteristics of high output torque and good reliability of wire control, and it is equipped with a shift fork assembly for synchronous and asynchronous rotation of the dual rotors, so as to realize the functions of wire control steering and electric power steering, and give full play to the advantages of recirculating ball steering High reduction ratio capability maximizes system power assist torque, realizes electric power assist function, simplifies the system, provides wire control function and ensures system reliability at the same time

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