What is the reason for the exclamation mark on the steering wheel preventing startup?
1 Answers
The exclamation mark on the steering wheel indicates the electric power steering warning light, which disappears immediately after the engine starts. The Electric Power Steering (EPS) system is a power steering system that directly relies on an electric motor to provide assistive torque. Compared to the traditional Hydraulic Power Steering (HPS) system, the EPS system offers many advantages. The EPS system mainly consists of a torque sensor, vehicle speed sensor, electric motor, reduction mechanism, and Electronic Control Unit (ECU). The electric power steering system evolved from the traditional mechanical steering system. It utilizes the power generated by an electric motor to assist the driver in steering operations. The system primarily comprises three major components: signal sensing devices (including torque sensor, steering angle sensor, and vehicle speed sensor), steering assist mechanism (electric motor, clutch, reduction transmission mechanism), and electronic control unit. The electric motor operates only when assistance is needed. When the driver operates the steering wheel, the torque and angle sensor generates corresponding voltage signals based on the input torque and steering angle. The vehicle speed sensor detects the speed signal, and the control unit issues commands to control the electric motor's operation based on the voltage and speed signals, thereby generating the required steering assistance.
