Research on road-sense simulation algorithm and analysis of its effect on different steering wheels

With the continuous development of automotive intelligence, cars increasingly want chassis to be more intelligent, electronically controlled, integrated and lightweight. Therefore, the steer-by-wire system, controlled by the line, with high precision and fast response, can provide better flexibility, stability and comfort for the car and can well meet the above requirements, has been widely concerned. As the steer-by-wire system eliminates the mechanical structure, the road sense cannot be directly transmitted to the steering wheel. The road sense obtained according to the vehicle state or combined with the driving environment planning needs to be applied to the steering wheel through the road sense motor to complete the simulation of the road sense so that the driver can feel the feedback similar to driving the traditional steering vehicle. In this way, the driving experience of the driver can be increased. It can also enhance driving safety, so it is very important to study the road sense simulation of the steer-by-wire system. The road sense analog motor is an important part of a steer-by-wire system. Non-direct drive motors have limited torque and generally need to add devices such as retarders, which will produce gaps, mechanical losses, noise and additional friction resistance, reducing transmission efficiency. Direct drive motor omits many components and transmission components, its transmission efficiency is higher, faster response and higher accuracy, but the cost is also higher. This paper compares dynamic model estimation methods and parameter fitting methods for road sense simulation for steer-by-wire systems and designs a road sense simulation algorithm based on a dynamic model. The results of the two motors are compared through the hardware-in-the-loop test. NI PXI industrial computer is used as the hardware controller and NI Veristand is used for hardware and software signal transmission on the test bench.