A method for calculating a vehicle steering resistance moment considering the friction between a tire and a road surface

Abstract

The invention discloses a method for calculating a vehicle steering resistance moment considering the friction between a tire and a road surface. A vehicle steering resistance moment model is established and verified by calculating a tire / road in-place steering friction moment and a return moment generated by an inclination angle of a kingpin. By calculating the friction torque of tire / pavement low-speed steering and the rectifying torque of kingpin inclination angle, kingpin back inclination angle and tire towing distance, the model of vehicle low-speed steering resistance torque is established and verified. Based on this method, by taking into account the friction between the tire and the pavement, not only the relationship between the steering resistance torque described by the existingempirical formulas, the front axle load and the tire pressure is included, but also the influence of the inclination angle of the kingpin and the wheel steering angle on the steering resistance torque is considered, at the same time, the variation relationship of the low speed steering friction torque along with the vehicle speed and the correspondance relationship between the tire cornering force, the tire return torque and the vehicle speed and the wheel steering angle can be easily found out. The calculation method is more accurate.

Description

technical field [0001] The invention relates to the technical field of vehicle steering systems, in particular to a calculation method for vehicle steering resistance distance considering the friction between tires and road surfaces. Background technique [0002] With the rapid development of the national economy and high-grade road network, the speed of heavy commercial vehicles such as large passenger cars and heavy trucks, which are the main force of road transportation, has been greatly increased, and the safety problems of high-speed driving have become increasingly prominent. The steering system is an important part of the car chassis, which is very important to the driving safety of the car. At present, the hydraulic power steering system (HPS) is widely used in heavy-duty commercial vehicles. The special steering pump has been running at high speed under the drive of the engine, and the ineffective energy consumption is large. Passenger cars and light commercial ve...

AI Technical Summary

Problems solved by technology

[0003] In order to promote the application of EPS on heavy-duty commercial vehicles, it is necessary to focus on solving the problem of insufficient power provided by the vehicle power system during in-situ steering or low-speed steering: heavy-duty commercial vehicles require large steering power when in-situ or low-speed steering, The power supply system of the whole vehicle cannot meet the demand of steering power; but in most of the running time, it is in the state of medium and high speed driving, the steering resistance torque is small, and the required steering power is also small, so the power supply system of the whole vehicle can meet the demand of steering power

When the vehicle turns at a low speed, the friction between the tire and the road surface includes sliding friction and rolling friction. With the change of vehicle speed and wheel steering angle, the ratio between the two components is transferred to each other, and the dynamic process is quite complicated.

At the same time, for the calculation of the in-situ steering resistance torque, several empirical formulas in the literature only describe the relationship between the steering resistance torque and the structural parameters of the tire and steering system (such as: tire pressure, tire width, front axle load, main axle load, etc.). Pin offset, etc.), does not involve the influence of the wheel steering angle on the steering resistance torque

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