The so-called power steering, by external means, so that the driver can be done with less force steering. Initially used in some large car, you need not be so effortlessly can easily complete the turn. It is now widely used in a variety of models on, making driving more relaxed, agile, improve driving safety to a certain extent.
1. The power steering Glossary
The so-called power steering, by external means, so that the driver can be done with less force steering. Initially used in some large car, you need not be so effortlessly can easily complete the turn. It is now widely used in a variety of models on, making driving more relaxed, agile, improve driving safety to a certain extent.
2. The steering classification system
power steering system is disposed on the current car, can be roughly divided into three categories,
(1) a first type of mechanical hydraulic power steering system;.
a mechanical hydraulic power steering system generally consists of a hydraulic pump, tubing, pressure flow rate control valve, V-belts, storage tanks and other members configured.
2. No matter whether the car steering, the system should work, but also in the large shift to lower-speed, hydraulic pump output needs more power to get bigger boost. So, also a waste of resources to some extent. You can recall: On such a car, especially when turning at low speed, the direction that relatively heavy, the engine is also more effortless. Also, because a lot of pressure of the hydraulic pump is relatively easy to damage the power system. Also, the mechanical hydraulic power steering system consists of a hydraulic pump and piping and cylinder components, in order to maintain the pressure, regardless of whether you need power steering, the system always in operation, high energy consumption, resource consumption and this is one of the reasons lies. General economic cars using a mechanical hydraulic power system more.
(2) The second type is the electro-hydraulic power steering system;
1 Main components: storage tanks, power steering control unit, the electric pump, steering , steering sensor, wherein the control unit and the electric power steering pump is a unitary structure.
2 works: electro-hydraulic steering system overcomes the drawbacks of the conventional hydraulic power steering system. It uses the hydraulic pump is no longer directly driven by an engine belt, instead of using an electric pump, it is the status of all the work by the electronic control unit according to the traveling speed of the vehicle, steering angle, etc. ideal state calculated signal. Briefly, large steering at low speeds, the electronic control unit drives the electronic hydraulic pump higher power output at a high speed, the driver turning the steering effort; car at high speeds, the hydraulic control unit drivesElectronic hydraulic pump at a lower speed operation, high speed does not affect the play in the steering need to save part of the engine power. It is more commonly used power steering system. Mondeo is the use of electro-hydraulic power steering system.
(3) The third electric power steering system
1. English name is Electronic Power Steering, referred to as EPS, which uses the power generated by the motor for assist motorists power steering. EPS configuration, although different vehicle structural member are not the same, but is generally identical. Usually a sensor, an electronic control unit, motor, reducer, mechanical steering, and a battery power source is constituted by the torque (steering).
2 operating principle: The car steering torque (steering) Sensor “feel” to the intended direction of rotation and the torque of the steering wheel, these signals are sent to the electronic control unit via a data bus, the electronic control unit will drive torque, the direction of data transfer intended signal, issues an operation command to the motor controller, so that the motor will require a specific rotational torque output according to the corresponding size, resulting in a power steering. If you do not turn, this sets the system does not work in standby (sleep) state waits for the call. Due to the operating characteristics of the electric power steering, and you will feel open such a car, a better sense of direction, more stable at high speeds, the saying goes, the direction is not flighty. Also, because it does not work when turning, so, how much energy is saved degree. Luxury cars generally use such a power steering system more. Lexus RX entire system equipped with electric power steering.
3. There are some car dubbed electric power steering, in fact, on pure electric power steering are not real, it requires a hydraulic system, but by the motor oil. Conventional hydraulic power steering pump driven by the engine system. To ensure portability in place when the car turning or low speed steering pump displacement is the flow when the engine is idling determined. Most of the time while the car is running above idle speed and the straight running state, only the majority of the oil pump output back to the tank through the control valve, resulting in a large “parasitic losses.” To reduce such losses using a motor driven oil pump, when the motor at low speed when the vehicle is traveling straight when the steering motor speed operation, by adjusting the pump motor speed controlFlow and pressure to reduce “parasitic losses.”