Power steering device for intelligently controlling critical angle of steering wheel

Abstract

The invention provides a power steering device. The device comprises a housing assembly (1), an input shaft and screw assembly (2), a toothed fan shaft assembly (3), a corner torque sensor (8), and a motor assembly (11), wherein the corner torque sensor is axially connected with an input shaft and a screw shaft by rotating the input shaft forward or backward through a steering wheel; according to the state information (such as a vehicle speed, a turning radius and a road surface inclination) of a travelling vehicle and vehicle structure characteristics (such as a tread, a wheel base and weight), at different speeds, a system dynamically predicts and analyzes to obtain the maximum angle alpha0 permitted by the steering wheel under the assumption that a vehicle is in a critical state of rollover or sideslip; when a driver controls the vehicle over the time of the maximum angle, the system drives a motor to increase a steering resistance reversely and rapidly and prevent the steering wheel from turning, thereby effectively avoiding the rollover or sideslip of the vehicle when the driver controls the vehicle. The power steering device can intelligently calculate the maximum angle permitted by the steering wheel, thereby improving the safety degree of the steering device.

Description

technical field [0001] The invention belongs to the application field of electromechanical systems and motor vehicles, and in particular relates to a heavy-duty circulating ball type dual-mode electric power steering device. Background technique [0002] From the perspective of the automobile industry, as the number of fuel vehicles continues to grow, vehicle emissions are causing more and more serious pollution to the environment. At the same time, oil, as a non-renewable energy source, is also facing the crisis of depletion. Vehicles and hybrid vehicles have become the focus of the government and society because of their advantages of energy saving and environmental protection, and have become the core development theme of today's wheeled vehicle technology. Electric power steering technology (EPS) has been widely used in domestic and foreign household vehicles due to its significant advantages such as high integration, energy saving, and maintenance-free, but it is mostly...

AI Technical Summary

Problems solved by technology

Due to practical factors such as the large load on the steering axle of heavy vehicles (generally more than 4 tons) and the singleness of the layout of the power steering device (usually located in the power cabin), the use of rack and pinion steering devices or steering column steering devices cannot meet the requirements. , it is necessary to adopt a recirculating ball structure with high overall structural strength and strong impact resistance, and the current recirculating ball steering structure only exists in heavy-duty hydraulic power steering devices and has nothing to do with electric power steering systems

[0007] 2. The structural strength requirements of key components and parts are high, and the system matching is difficult

As far as the recirculating ball hydraulic power steering is concerned, its screw, gear fan shaft, housing, steering nut and other components are often damaged due to external impact loads

[0008] 3. Electromechanical matching is difficult

[0009] In addition, there is also the fact that the critical angle of the steering wheel cannot be calculated, resulting in oversteering and prone to rollover

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