A variable transmission ratio optimization design method of a multi-mode drive-by-wire power steering system and a special system thereof
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A power steering and optimized design technology, applied in computing, mechanical equipment, combustion engines, etc., can solve the problems of driver isolation, ignoring driving experience, and dull steering feeling
Active Publication Date: 2019-05-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0003] However, the current power steering system on the market is mainly used in cars, and there are few reports about power steering for commercial vehicles with large front axle loads.
Secondly, it is difficult for a single driving mode to meet the different requirements of drivers. Steering by wire cancels the mechanical connection, which facilitates the layout of the mechanical structure, but the driver is also isolated from the real road feeling; The design of the variabl...
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Embodiment 1
[0104] Embodiment 1 Multi-mode power steering system by wire and its variable transmission ratio optimization design method
[0105] Such as figure 1 As shown, a multi-mode power steering system based on steer-by-wire includes a vehicle body, a steering mechanical module, an electro-hydraulic power assist module, an ECU control module 4, a rotary switch 25 and on-board sensors.
[0106] Steering mechanical module includes steering wheel 1, steering column 2, road sensor motor 4, electromagnetic clutch A10, electromagnetic clutch B9, double planetary gear mechanism 11, worm gear mechanism 12, corner motor 13, wheels 14, steering tie rod 15, rack and pinion Mechanism 17; the steering wheel 1 is located inside the car body, one end of the steering column 2 is connected to the steering wheel 1, and the other end is connected to the electromagnetic clutch B9; the electromagnetic clutch B9 and the electromagnetic clutch A10 are both arranged on the steering column 2, and the electro...
Embodiment 2
[0130] Embodiment 2 Based on the variable transmission ratio optimization design method of the multi-mode power-by-wire steering system
[0131] This embodiment also provides a variable transmission ratio optimization design method based on the multi-mode power-by-wire steering system described in the embodiment, which specifically includes the following steps:
[0132] Step 1), establish the dynamic model of power steering system by wire
[0133] 1.1) Vehicle three-degree-of-freedom model
[0134] Take the following coordinate system oxyz: the intersection of the vertical line passing through the center of mass of the car and the roll axis (the line connecting the front and rear leaning centers) when the car is stationary is the origin o; the longitudinal horizontal axis of the car is the x-axis, and the forward direction is positive; at x On the horizontal plane where the axis is located, the direction passing through the origin and perpendicular to the x-axis is the y-axis...
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Abstract
The invention discloses a variable transmission ratio optimization design method of a multi-mode drive-by-wire power steering system and a special system thereof. The method comprises the following steps: 1) establishing a drive-by-wire power steering system dynamic model; 2) establishing road feel and sensitivity evaluation indexes of the steer-by-wire system; Step 3) starting to increase progressively at the speed of 25km/h, and setting 10 groups of vehicle speeds; 4) taking the steering transmission ratio as an optimization variable, determining the transmission ratio under the fixed yaw velocity gain and the fixed lateral acceleration gain according to the automobile parameters and the automobile speed, taking the transmission ratio as a design space of the transmission ratio, and taking the steering road feel and the steering sensitivity as optimization objectives to establish a multi-objective optimization model; Step 5) According to the transmission ratio optimization result, adopting the smooth curve to perform fitting to obtain an optimized design result. According to the transmission ratio optimization method of the steering system, through further optimization design ofthe transmission ratio of the steering system, the road feel and sensitivity of automobile steering are considered, the comprehensive performance of the steering system can be effectively improved, and the driving experience of a driver is improved.
Description
technical field [0001] The invention relates to the field of power-by-wire steering, in particular to an optimal design method for variable transmission ratio of a multi-mode power-by-wire steering system based on steer-by-wire and a special system thereof. Background technique [0002] Steering system is one of the key parts of the car. The driver controls the direction of movement of the car through the steering system. Therefore, the design of the steering system directly affects the safety of the car, the stability of the steering and the comfort of driving. The steer-by-wire system is a new generation of steering system. Because the mechanical connection between the steering wheel and the steering wheel is canceled, it is also called a flexible steering system. The power steering system by wire control completely gets rid of the various limitations of the traditional steering system. The driver's steering operation is only to input the steering wheel angle signal comman...
Claims
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Application Information
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