Control method for energy-saving intelligent electro-hydraulic steering system and system thereof

Abstract

The invention relates to a control method for an energy-saving intelligent electro-hydraulic steering system and a system thereof. The control method comprises the steps that (1) the working mode of the energy-saving intelligent electro-hydraulic steering system is determined based on the obtained torque of a steering wheel; (2) if the working mode is a non-assistance mode, the short-circuit duty ratio 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 ratio; (3) if the working mode is an EPS power mode, the three-phase duty ratio of a motor in the EPS subsystem is calculated through a power control algorithm, and a corresponding control signal is output to the EPS subsystem; and (4) if the working mode is an EPS+EHPS power assisting mode, the three-phase duty ratio of an electric pump driving motor in the EHPS subsystem and the opening and closing state of an electromagnetic valve are calculated through a hydraulic power assisting control method, then the electric pump driving motor is driven to generate corresponding torque, and meanwhile opening and closing of the electromagnetic valve are controlled. The method can be widely applied to 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 easy steering, so hydraulic power steering systems are still widely used in large commercial vehicles (Including engine-driven hydraulic power steering system HPS and electric pump system driven electrohydraulic power steering system EHPS). There are two main types of 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. On the one hand, this limits the selection of key components such as electric pumps. On the other hand, this...

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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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