Hardware-in-loop test bench suitable for automobile steer-by-wire

Abstract

The invention discloses a hardware-in-loop test bench suitable for automobile steer-by-wire. The hardware-in-loop road resistance simulation test bench suitable for automobile steer-by-wire is characterized in that steering resistance is accurately simulated through a resistance motor at the position of a master pin; steering postures and dynamical features of an actual steering system are reduced accurately; and target simulation resistance can be adjusted in real time according to on-line simulation software. The hardware-in-loop test bench comprises a support device, a steering execution system, a resistance simulation system, steering knuckles, a hardware real-time simulation platform and a signal transmission cable. The test bench, according to a full vehicle dynamic model operating in the hardware real-time simulation platform, carries out calculation in real time to obtain road torque applied to a vehicle wheel as a target loading torque, and thus steering resistance under different vehicle speeds and different steering intentions can be simulated dynamically; through use of different steering gears and adjustment of the support device for adjusting, steering systems of different types of vehicles can be simulated; and the test bench has a certain universality.

Description

technical field [0001] The invention relates to the technical field of automobile steering, and specifically designs a hardware-in-the-loop test bench suitable for automobile steering by wire. Background technique [0002] The performance of the steering-by-wire system directly affects the handling stability, safety and comfort of the car during driving. The automobile steering system has gone through the stages of traditional mechanical steering, hydraulic power steering system and electric power steering system, and has greatly improved the driver's control and riding experience. The common point of the above steering systems is that there is a mechanical connection between the steering mechanism and the steering actuator, the transmission ratio is fixed, and the steering characteristics of the vehicle change with the speed of the vehicle. The current rapid development of automotive electronic control technology has promoted the reform and innovation of automotive steerin...

AI Technical Summary

Problems solved by technology

[0005] At present, there are various forms of resistance simulation, and the typical methods include spring-loaded, jack-loaded, electro-hydraulic servo, magnetic powder brake and motor-loaded; for example, application number 200820081713.5 uses a fixed spring at one end to simulate resistance, simulating the magnitude of resistance and the compression of the spring The amount or elongation has a linear relationship. Once the spring selection is completed, the spring stiffness remains unchanged. The resistance simulation is only related to the spring deformation, but the resistance simulation is not controlled. The accuracy cannot meet the experimental requirements and cannot reflect the actual vehicle steering. External force during the process

Application number 201010191612.5 adopts electro-hydraulic system for resistance simulation, and uses servo valve for resistance simulation control of hydraulic cylinder. Due to high requirements for hydraulic system equipment, high cost, large space occupation and complex structure, there is also a hidden danger of oil leakage in the hydraulic system. At present, it cannot be effectively solved. In addition, there is a certain lag in the output of the hydraulic system, which cannot meet the real-time requirements of the simulation.

Application No. 201310274371.4 uses a motor for resistance simulation. The motor is installed on the steering actuator, and the output shaft of the motor meshes with the rack of the steering actuator to simulate the steering resistance. It does not take into account the actual situation. The external environment reflects the steering resistance through the tires and cannot fully reflect the reality. Happening

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