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Electronic Power Steering

The Electronic Power Steering (EPS) includes the same components as in the conventional power steering system. Additionally is a solenoid valve on the power steering gear box, and a close below the audio control unit located in the middle farcia panel. To control the flow of oil to the steering gear box, provided a solenoid which works based on the flow of control module that receives a signal from the VSS (Vehicle Speed Sensor) and TPS.

Electric Power Steering Mechanism
The workings of Electric Power Steering System (EPS) is when the key is turned to the ON position, the Control Module obtain electrical current for stand-by condition, in conjunction with the EPS indicator on the instrument panel lights up. When the engine, Noise Suppressor immediately inform the Control Module to activate the electric motor and clutch immediately connect the motor to the steering column. One sensor is located on the steering rack duty to give information on the Control Module when the wheel starts playing. Called Torque Sensor, it sends information about how far and how fast the wheel is rotated rotation. With two such information, Control Module immediately sends an electric current as needed to the electric motor to rotate the steering gear. Thus the process of turning the steering wheel to be mild. Vehicle Speed Sensor served as the car starts moving. These sensors provide information to the control module on the vehicle speed. At high speeds, generally starting from 80 km / h, the electric motor will be turned off by the Control Module.



With so steering becomes heavier thus increasing safety. So the EPS system regulates the amount of electrical current supplied to the electric motor only as needed only. In addition to regulating the electric motor work based on the information from the sensors, Control Module also detect if there is a malfunction of the EPS system. EPS indicator light on the instrument panel will illuminate certain flashes if there is damage. Furthermore, the Control Module disables the electric motor and clutch will disconnect the motor to the steering column. However, because the steering system is equipped EPS is still connected to the wheel via a steel rod, it is still possible to drive the car. Although the wheel will rotate the steering feels heavy like without power steering.



Electric Power Steering (EPS) using some electronic devices such as:
  • Control Module: As the computer to organize work EPS.
  • Electric motors: Duty to directly help alleviate wheel rotation.
  • Vehicle Speed Sensor: Located in the gearbox and the duty to tell the control module on the speed of the car.
  • Torque Sensor: Located in the steering column with the task of giving information to the control module when the wheel starts playing by the driver.
  • Clutch: This clutch is between the motor and the steering column. Duty to connect and disconnect the motor with the steering column according to the conditions.
  • Noise Suppressor: Acting as a sensor that detects the engine is running or not.
  • On-board Diagnostic Display: in the form of an indicator on the instrument panel will light up if there is a problem with a bunch of EPS system.

Advantages EPS

EPS does not just do the usual power steering function, but also can control the pressure of hydraulic pressure which reacts by a counter-force on the plunger that is fixed in the gear box input shaft, which is why the characteristics of steering effort vs. hydraulic pressure varies depending on the speed of the vehicle to provide optimum steering characteristics fit with vehicle speed and steering conditions.

  1. When the car is stationary and in a state of slow running round light steering.
  2. Setting steering effort based on vehicle speed.
  3. In a medium speed and fast, it will increase steering effort to increase the stability and comfort of steering.
  4. In a medium speed and fast, when the rudder position at or near the neutral position, the plunger will add a reactionary function steering effort so that the steering is more stable.
  5. When the vehicle passes through the damaged road at medium speed and fast, although there is a big obstacle on the road surface, but will not affect the direction of the steering control, because the output pressure hydraulic steering effort to be the same height as the conventional power steering.
  6. This system has a fail-safe function that although the electrical system, including control units and sensors, but the characteristics of the normal power steering can still be in the can.

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