What are the common issues with electric power steering in cars?
2 Answers
Common issues include loss of power assistance and the steering wheel becoming heavier. Below is an introduction related to electric power steering: 1. Features: The Electric Power Steering (EPS) system applies the latest power electronics technology and high-performance motor control technology to the vehicle's steering system. It significantly improves the vehicle's dynamic and static performance, enhances driver comfort and safety during driving, and reduces environmental pollution. As a result, since its proposal, this system has garnered attention from many major automotive companies, leading to its development and research. In the future, EPS is expected to become the mainstream in steering systems. Compared to other steering systems, its outstanding advantages are reflected in: 2. Working Principle: The basic principle of EPS is that the torque sensor is connected to the steering shaft (pinion shaft). When the steering shaft rotates, the torque sensor starts working, converting the relative angular displacement between the input and output shafts caused by the torsion bar into an electrical signal sent to the ECU. The ECU determines the motor's rotation direction and the magnitude of the assist current based on signals from the vehicle speed sensor and torque sensor, thereby achieving real-time control of the power steering. This allows for easy adjustment of the motor's assist effect at different speeds, ensuring the vehicle is light and agile during low-speed steering and stable and reliable during high-speed steering.
Common issues with electric power steering mainly focus on several aspects. For example, a jerky feeling when turning the steering wheel, especially noticeable during slow turns or parking maneuvers, is often caused by torque sensor data drift. Some drivers experience steering wheel vibrations accompanied by a buzzing sound, which is typically due to wear in the reduction gears of the power assist motor, and deteriorated lubricant can worsen this situation. The most concerning issue is sudden loss of power assist, which I've seen frequently caused by short circuits in the control module due to moisture, particularly in vehicles with lower chassis that require extra caution when driving in the rain. For daily use, avoid holding the steering wheel at full lock for extended periods, and check the electronic power steering system's wiring connectors for oxidation or looseness every two years.
