Compared with the traditional hydraulic power steering system, the electric power steering system has the following advantages:
1. The motor only provides power when turning, which can significantly reduce fuel consumption.
The traditional hydraulic power steering system is driven by the engine to drive the oil pump, which consumes part of the engine power regardless of steering or non-steering. The electric power steering system is only assisted by the motor when turning, and does not consume energy when not turning. Therefore, the electric power steering system can reduce the fuel consumption of the vehicle.
Comparison with the hydraulic power steering system shows that electric power steering can reduce fuel consumption by 2.5% when not turning, and 5.5% when turning.
2. The steering assist size can be adjusted by software, which can balance the steering lightness at low speed and the steering stability at high speed, and the return performance is good. The steering assist force provided by the conventional hydraulic power steering system cannot be changed as the vehicle speed increases. This makes the vehicle have good steering and portability at low speeds, but the steering wheel is too light at high speeds, causing a "floating" phenomenon. The driver lacks a significant "road feeling" and reduces the vehicle at high speed. Stability and driver safety.
The power assisted by the electric power steering system can be easily adjusted by software. At low speeds, the electric power steering system can provide greater steering assistance and provide steering flexibility of the vehicle; as the vehicle speed increases, the steering assist provided by the electric power steering system can be gradually reduced, and the driver needs to provide the steering. The steering force will gradually increase, so that the driver will feel the obvious "road feeling" and improve the stability of the vehicle.
The electric power steering system can also apply a certain additional positive return torque or damping torque, so that the steering wheel can accurately return to the middle position at low speed, and can suppress the oscillation and overshoot of the steering wheel during the high speed returning process, taking into account the high vehicle Positive performance at low speed.
3. Compact structure, light weight, the production line is assembled, easy to maintain.
The electric power steering system eliminates hydraulic steering oil pumps, cylinders, hydraulic lines, oil tanks, etc., and the motor and speed reduction mechanism can be integrated with the steering column and the steering gear, making the entire steering system compact and lightweight, in the production line. The assembly is good, saving assembly time and easy maintenance.
4. Through the setting of the program, the electric power steering system is easy to match with different models, which can shorten the cycle of production and development.
Since the electric power steering system has many of the above advantages, it has been increasingly used in recent years.
The electric power steering system is based on the mechanical steering system, and is equipped with a motor and a speed reduction mechanism, a torque angle sensor, a vehicle speed sensor and an ECU electronic control unit.
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