■ What electric power steering system EPS
EPS is the English acronym of Electric Power Steering, i.e., electric power steering system. Electric power steering system is the development direction of the automobile steering system. The system provided by the electric power steering unit directly, eliminating the need for hydraulic power steering systems necessary power steering pump, hoses, hydraulic fluid, and a belt pulley mounted on the engine, saving energy and protecting the environment. Further, with a simple adjustment, and assembly can provide flexible steering characteristics under various conditions. It is precisely because of these advantages, electric power steering system as a new steering technology, the challenge we are very well-known, already has 50 years of history of the hydraulic steering system.
When the driver performs steering in the steering wheel, the steering wheel torque sensor detecting a steering torque and the magnitude of the voltage signal is conveyed to the electronic control unit, the electronic control unit detects the rotation torque sensor from the voltage signal, a rotational direction and a vehicle speed signal, etc., sent commands to the motor controller, the motor output corresponding to the magnitude and direction of steering torque, thereby generating auxiliary power. When the vehicle is not turning, the electronic control unit does not issue an instruction to the motor controller, the motor does not operate.
■ technical advantages
1, energy saving since the engine is running, the hydraulic pump is always active, so that the whole engine hydraulic steering system fuel consumption increased by 3% to 5%, while the EPS battery as energy to the motor-driven element, can work independently of the engine, EPS consumes little direct engine fuel. EPS there is no fuel leak hydraulic power steering system, EPS through electronic control, almost no pollution to the environment, but also reduces fuel consumption. 2, the main components of the installation may be easy to EPS with integrated, easy to arrange, as compared with the hydraulic power steering system reducing the number of components, the hydraulic system does not require pumps, tubing, pressure and flow control valves, storage tanks and other elements number of small, easily assembled, saving time. 3, high efficiency hydraulic power steering system efficiency is usually 60 to 70 percentage percentage, and the higher the efficiency of the EPS, up to 90%.
4, good road feel conventional hydraulic power steering pure mostly fixed magnification, a large driving force is workingBut it can not achieve a sense of easiness and road car while driving in a variety of speed. The hysteresis characteristics of the EPS system can be compensated for by EPS controller software, making the car at all speeds can be satisfied with power steering.
5, back to the simple positive good EPS system configuration, not only easy to operate, can also adjust the EPS controller software, the best return-resistance, thereby improving vehicle handling stability and comfort.
■ main structure
Product from the steering sensor device, the vehicle speed sensor, a mechanical assist means to provide steering assist motor and a microcomputer control unit.
■ works
The microcomputer control unit and the steering sensing arrangement outgoing vehicle speed sensor to determine the magnitude and direction of steering, and the steering assist operation of the drive motor.