Electronically controlled hydraulic power steering system and multi-objective optimization method based on system

A power-assisted steering and electronically controlled hydraulic technology, which is applied to steering mechanisms, steering rods, fluid steering mechanisms, etc., can solve the problems that energy consumption cannot be considered comprehensively, and the energy consumption of automobile steering is small.

Inactive Publication Date: 2015-12-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing research on the electronically controlled hydraulic power steering system, on the one hand, the motor speed can only be determined according to the vehicle speed and steering wheel torque, and then the power assist torque is controlled by controlling the speed of the motor. The degree can only be adjusted linearly depending on the angle of the steering wheel, which is not suitable for meeting the requirements of making the energy consumption of the car steering as small as possible under multiple working conditions, and the system structure has a large degree of improveme

Method used

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  • Electronically controlled hydraulic power steering system and multi-objective optimization method based on system
  • Electronically controlled hydraulic power steering system and multi-objective optimization method based on system
  • Electronically controlled hydraulic power steering system and multi-objective optimization method based on system

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Embodiment 1

[0077] Embodiment 1 Electronically controlled hydraulic power steering system

[0078] like figure 1 As shown, an electronically controlled hydraulic power steering system includes a steering mechanical unit, a rotary valve opening adjustment unit, an oil pump adjustment unit and an electronic control unit ECU16;

[0079] Wherein, the steering mechanical unit includes a steering wheel 1, a steering shaft 3, a rack and pinion steering gear 4 connected in sequence, and a cross shaft 28 with wheels connected at both ends. A hydraulic cylinder 7 is also arranged on the cross shaft, and the hydraulic cylinder piston 8 is located at 7 in the hydraulic cylinder;

[0080] The rotary valve opening adjustment unit includes a connected rotary valve 26 and a rotary valve regulating motor 27. A hydraulic oil return line 10 is provided between the rotary valve 26 and the hydraulic oil tank 11, and a hydraulic cylinder is provided between the rotary valve 26 and the hydraulic cylinder 7. T...

Embodiment 2

[0086] Embodiment 2 multi-objective optimization method

[0087] In this embodiment, the modeling software used is MATLAB-simulink, and the optimization software is isight;

[0088] In this embodiment, the system described in Embodiment 1 is used for multi-objective optimization calculation, figure 2 It is a schematic diagram of the process framework of the multi-objective optimization method, and the specific steps are as follows:

[0089] Step 1: According to "Research on Automobile Power Steering Pump and Control Valve" (Shandong University of Science, etc., Science Research in Universities), "Design Research on Electronically Controlled Hydraulic Power Steering System" (Zhang Junjun, Jiangsu University), "Electrohydraulic Power Steering System Control Strategy and Energy Consumption Analysis Method” (Su Jiankuan et al., Mechanical Design and Manufacturing) discloses the method to establish the electrohydraulic power steering system model, the vehicle dynamics model, and ...

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Abstract

The invention relates to an electronically controlled hydraulic power steering system and a multi-objective optimization method based on the system. The electronically controlled hydraulic power steering system comprises a steering mechanical unit, a steering valve opening degree adjusting unit, an oil pump adjusting unit and an electronic control unit (ECU). The problems that in a traditional electronically controlled hydraulic power steering system, steering assistance power can be changed only by changing the rotating speed of an oil pump drive motor, and the opening degree of a steering valve can be linearly adjusted only according to the corner of a steering wheel are solved. Meanwhile, multi-objective optimization is carried out on the electronically controlled hydraulic power steering system, steering road feelings, steering sensitivity and energy consumption are taken as objectives, based on a modified Memetic intelligence algorithm, optimization design is carried out on mechanical parameters and hydraulic system parameters of the electronically controlled hydraulic power steering system, and therefore the system has the good steering road feelings and steering sensitivity with smaller energy consumption.

Description

technical field [0001] The invention relates to the field of automobile electronically controlled hydraulic steering systems, in particular to an electronically controlled hydraulic power steering system and a multi-objective optimization method based on the system. Background technique [0002] The electronically controlled hydraulic power steering system is driven by an electric motor, and the vehicle speed is monitored by a vehicle speed sensor. After obtaining the data, the electronic control unit ECU changes the oil pressure by controlling the opening degree of the steering control valve and the speed of the vane pump driving motor to realize the steering power. A new type of automotive power steering system that can be adjusted in size is currently widely used in automotive power steering. Compared with the traditional hydraulic power steering system, the electronically controlled hydraulic power steering system has the advantages of better handling feeling and dynamic...

Claims

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Application Information

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IPC IPC(8): B62D5/06B62D6/00G06F17/50B62D119/00B62D137/00
Inventor 王春燕崔滔文赵万忠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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