A control method and system for an energy-saving intelligent electro-hydraulic steering system

Abstract

The present invention relates to a control method and system for an energy-saving intelligent electro-hydraulic steering system, comprising: 1) determining a working mode of the energy-saving intelligent electro-hydraulic steering system based on the obtained steering wheel torque; Then, the short-circuit duty cycle of the motor is obtained according to the vehicle speed information, and the motor is controlled to generate damping according to the short-circuit duty cycle; 3) If the working mode is EPS assist mode, the assist control algorithm is used to calculate the three-phase duty cycle of the motor in the EPS subsystem. And output the corresponding control signal to the EPS subsystem; 4) If the working mode is EPS+EHPS assist mode, the hydraulic assist control method is used to calculate the three-phase duty cycle of the electric pump drive motor in the EHPS subsystem and the opening of the solenoid valve. In the closed state, the electric pump is then driven to drive the motor to generate the corresponding torque, and at the same time, the opening and closing of the solenoid valve is controlled. The invention can be widely used in the field of steering system design.

Description

technical field [0001] The invention belongs to the technical field of steering systems, and in particular relates to a control method and system for an energy-saving intelligent electro-hydraulic steering system. Background technique [0002] For large commercial vehicles, the large axle load makes the electric power steering system commonly used in passenger cars unable to provide sufficient steering assistance to ensure the lightness of steering. Therefore, hydraulic power steering systems are still widely used in large commercial vehicles. (Including the engine-driven hydraulic power steering system HPS and the electric pump system-driven electro-hydraulic power steering system EHPS). There are two main problems with this type of hydraulic power steering system: [0003] 1. The EHPS system needs to have a large rated power to meet all the steering requirements of commercial vehicles. This limits the selection of key components such as electric pumps. The high-voltage e...

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Problems solved by technology

[0007] In view of the above problems, the object of the present invention is to provide a control method and system for an energy-saving intelligent electro-hydraulic steering system, which utilizes the structural advantages of the energy-saving intelligent electro-hydraulic steering system to realize electric power steering (EPS) subsystems and hydraulic power assistance. The coordinated cooperation of the steering (HPS) subsystem realizes the minimization of the flow demand of the steering system, that is, the system flow is completely determined by the volume change of the power cylinder caused by the rotation of the steering wheel, and there is no waste of flow. At the same time, the pressure control method is introduced into the hydraulic power steering The system fundamentally solves the problem that most of the energy of the existing hydraulic power steering system is wasted, and realizes the reduction of system energy consumption

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