Electric Power Steering

24 Фев 2014 | Author: | Комментарии к записи Electric Power Steering отключены
Coda electric car

Electric Power Steering


Electric Power (EPS) has replaced hydraulic steering in many new vehicles One of the advantages of electric power is that it eliminates the power pump, which can use as much as 8 to 10 under load. This fuel economy while eliminating the weight and bulk of the steering pump and hoses. rid of the hydraulics also does with fluid leaks and the to check the power steering Electric power steering is quieter than hydraulic because there is no pump and no fluid flowing through and valves.

But the most noticeable is in handling and steering refinement.

power steering can be fine with a precision that is to match with hydraulic By monitoring the driver’s steering vehicle speed, and other dynamics, the system can provide the right amount of steering and effort to match rapidly driving conditions. EPS can deliver effort when you need it, and steering effort when you do not it.

It can even provide steering when the engine is off.

yet, because the system is driven, it is possible to tap into the module and modify steering and feel. This can be done a factory scan tool on applications, and with aftermarket scan tools and software.


Electric power steering can be on a wide variety of vehicles the Acura NSX (which was the first car with this feature), S2000, Toyota Cortolla, and Toyota RAV4, numerous GM including 2004 and up Chevrolet Chevrolet Cobalt. Equinox, Pontiac G6 (except the Convertible, GTP and GT models), Pontiac G5, Torrent and Saturn ION and VUE, 2005 and up Mustang, and many many


Though some of the older power steering systems actually electro-hydraulic, and used an motor to drive a conventional pump, the latest generation of EPS is all The steering gear itself is a rack with an electric mounted on the steering column or the

When the driver turns the a steering sensor detects the and rate of rotation of the steering This information along input from a steering sensor mounted in the steering is fed to the power steering control Other inputs such as speed and inputs from the control or stability control are factored in to determine how much assist is required.

The control then commands the motor to a certain amount, and a sensor on the provides feedback to the control so it can monitor the motor’s position.

Prius electrtic steering


The General EPS system has several modes of

* Normal mode — and right assist is provided in to inputs and vehicle speed.

* mode — Used to steering return after a turn. Feedback from the position sensor prevents the EPS from overshooting the center

* Damper control mode Used to improve road and dampen kickback. This typically kicks in at higher speeds.

* Protection mode Protects electrical components thermal damage and excessive flow if the steering is held all the way to one in the lock position too long.

the steering wheel all the way to one side cause the Power Steering Module (PSCM) to command the amount of current to the EPS motor. If the wheel is then held in position for an extended period of the system will go into mode so the motor doesn’t In this mode, the PSCM limit the amount of current to the and reduce the level of power

If the PSCM detects a high temperature and the overload protection is enabled, a DTC C0176 System Error code may be set. On models, DTC C0476 Electric Motor Circuit Range/Performance may be set. These DTCs normal PSCM action steering assist) to prevent damage to power steering components.

Consequently, there is that needs to be fixed. But the needs to be educated about not and holding the steering against stop for a prolonged period of

If a sensor or other component in the EPS fails, the self-diagnostics should the fault, set a code and disable A warning light will to alert the driver, and the driver notice a significant increase in effort when turning the The vehicle will still be to drive, but it will require steering effort to do so.


On the GM EPS the electric motor is mounted on the column. The motor and PSCM are both part of the steering assembly, and are currently replaced as a if there is a problem with the On some other applications for example), the electric motor can be separately.

Electric steering motors can either be located at the of the steering column, as with GM, or with the steering rack, as Honda. The GM type uses a serviced motor assembly, the Honda type requires replacement if the motor is defective.

power steering columns can be to replace, costing anywhere $600 to $1500 or more on the application. So accurate diagnosis is to avoid replacing parts

After a PSCM or steering replacement, it may be necessary to use a scan needs to calibrate the center of the steering wheel position select the steering tuning for the or calibrate the center position of the shaft torque sensor.


For customizers and street rod Flaming River now sells an electric power steering can be adapted top fit various vehicles. But it is a expensive item, costing to $6000 depending on the version. The of using an electronic power unit in these kind of is that it simplifies installation and the need for a power steering and hoses.

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The steering position sensor determines the on position. This is used to return assist from over center once a is completed. The GM unit is 5 volt analog triangle signal with a valid signal range of 0 to 5 volts. The sensors 1 and signal 2 voltage values increase and decrease within 2.5 to 2.8 of each other as the steering is turned.

This information can be useful during diagnosis.

In GM EPS the Power Steering Control (PSCM) must be set up with the steering tuning, which are in relation to the vehicles Powertrain sedan, coupe, tire and size, etc.

GM has a technical bulletin (07-02-35-004 Feb. 02, out on a noise problem with EPS on the Cobalt, Chevy HHR and Pontiac G5. The describes a steering column or knocking noise that may be or felt at low speeds (5 to 15 mph). The is most noticeable when a slow turn on a loose or surface. The EPS system can be temporarily by removing the 60 amp EPS fuse in the under-hood block.

If the rattle persists, it is due to backlash the steering column (assist gear mechanism). Replace the 60 amp EPS and test drive again. If the column is identified as the source of the noise, the steering column to be replaced.

Update: March 2,

GM issues Recall on Vehicles Electric Power Steering

Motors is recalling 1.3 million to 2010 Chevrolet Cobalts, to 2010 Pontiac G5s, to 2006 Pontiac Pursuits in Canada, and 2005 to 2006 G4s sold in Mexico to fix power motors that might

GM says these cars are safe to drive, but warns a power steering motor can increase steering effort especially at speeds under 15 If the electric power steering fails, you may see a warning light on and hear a chime, or you may not. way, brace yourself the steering will suddenly much stiffer require mor effort to turn the car.

GM it will replace the electric on all 1.3 million vehicles, but that it take some time to get the new steering motors from supplier, JTEKT Corp. GM it will notify car owners the parts are available for installation.

The recall is in response to an investigation by the National Highway Traffic Administration in response to over complaints it has received about losing their power assist. The complaints included 14 and one injury.

GM says it will fix the models first because it takes about 20,000 to miles of driving for the condition to If the power steering assist it usually comes back for a after the car is shut off and restarted. But the won’t go away.

Fixing it replacing the electric motor provides the power assist.

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