Energy recovery system and control method of hydraulic power steering system
A hydraulic power steering and energy recovery technology, which is applied in the direction of fluid steering mechanism, etc., can solve the problems of large energy loss, single power assist characteristic, and pressure rise, and achieve the effects of improving energy recovery efficiency, enhancing output speed characteristics, and eliminating flow loss
Active Publication Date: 2017-02-22
JIANGSU UNIV
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Problems solved by technology
[0002] Heavy-duty vehicles often use a hydraulic power steering system due to the large steering resistance. The steering pump in the hydraulic power steering system is directly driven by the engine, which results in the output flow of the steering pump not changing with the change of working conditions, resulting in a single power assist characteristic and reactive power. The problem of high loss
Reactive power loss is mainly manifested in two aspects: the general steering pump is composed of a hydraulic pump, a flow control valve and a relief valve. When the engine speed is higher than the idle speed, part of the oil output by the hydraulic pump flows out from the pump outlet, and part of it flows from the flow control valve. Returning to the oil tank, the higher the speed, the greater the flow directly flowing back to the oil pump, and the greater the energy loss. The final energy loss will cause the temperature of the steering pump to rise and be lost in the form of heat; in addition, when the car is going straight, the steering system does not need to However, the oil output from the steering pump has been circulating in the hydraulic pipeline. Due to the hydraulic resistance in the hydraulic pipeline and the rotary valve, the pressure in the pipeline increases. The greater the hydraulic resistance, the higher the pressure, and the final loss is in The greater the energy in the pipeline and the rotary valve, the energy loss caused by the hydraulic pipeline and the rotary valve cannot be underestimated because the straight driving condition of the car accounts for most of the proportion.
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[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.
[0023] figure 1 A schematic diagram of the energy recovery system for the hydraulic power steering system. The energy recovery system of the hydraulic power steering system includes a wound electromagnetic slip clutch, an energy recovery device 7 , an excitation circuit and a controller 6 . The electromagnetic slip clutch is arranged between the engine and the steering pump, the engine is drivingly connected to the outer rotor 1 of the electromagnetic slip clutch, and the inner rotor 4 is drivingly connected to the steering pump. The electromagnetic slip clutch includes an outer rotor 1 , an inner rotor 4 , three-phase winding brushes 8 , and an excitation winding brush 5 . The three-phase winding 2 on the outer rotor 1 is connected to the three-phase winding brush 8, t...
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The invention provides an energy recovery system of a hydraulic power steering system and a control method thereof. The energy recovery system is formed by a winding type electromagnetic slip clutch, an energy recovery device, an excitation circuit and a controller. According to the control method, PWM (Pulse Width Modulation) 1, PWM2, PWM3 and K1 are controlled with the coordination of the speed regulation performance and the recycling performance of the electromagnetic slip clutch as an objective. The power can be supplied for a vehicle electrical system and the vehicle loading capacity can be enhanced through the energy recovery device. The energy recovery efficiency can be improved and the output characteristics of the electromagnetic slip clutch can be enhanced by the control method. The energy loss of a steering pump of the hydraulic power steering system and the energy loss in a hydraulic pipeline are eliminated and accordingly the energy conservation of the hydraulic power steering system is improved due to the energy recovery system of the hydraulic power steering system.
Description
technical field [0001] The invention relates to the field of automobile steering systems, in particular to an energy recovery system and a control method of a hydraulic power steering system. Background technique [0002] Heavy-duty vehicles often use a hydraulic power steering system due to the large steering resistance. The steering pump in the hydraulic power steering system is directly driven by the engine, which results in the output flow of the steering pump not changing with the change of working conditions, resulting in a single power assist characteristic and reactive power. The problem of high loss. Reactive power loss is mainly manifested in two aspects: the general steering pump is composed of a hydraulic pump, a flow control valve and a relief valve. When the engine speed is higher than the idle speed, part of the oil output by the hydraulic pump flows out from the pump outlet, and part of it flows from the flow control valve. Returning to the oil tank, the hig...
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IPC IPC(8): B62D5/06
CPCB62D5/06B62D5/10
Inventor唐斌江浩斌耿国庆马世典华一丁夏磊
OwnerJIANGSU UNIV