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Video History-Suspension 1
Video History-Suspension 2
Video History-Suspension 3
Video History-Suspension 4
Video History-Suspension 5
Video History-Suspension 6
Video History-Suspension 7

Video Undercarriage 1
Video Undercarriage 2
Video Steering Wheel 1
Video Steering Wheel 2
Video Steering Lock
Video Steering
Video Safety Steering
Video Rack Pinion Steering
Video Steering Ratio 1
Video Steering Ratio 2
Video Steering Ratio 3
Video Ball Steering
Video Worm Roller Steering
Video Hydraulic Power Steer. 1
Video Hydraulic Power Steer. 2
Video Electr. Power Steer. 1
Video Electr. Power Steer. 2
Video Electr.-hydraulic Pump
Video Torque (power steer.)
Video Electr. Stab. Program
Video Finger Steering
Video One-piece Track Rod
Video Four Wheel Steering 1
Video Four Wheel Steering 2
Video Four Wheel Steering 3
Video Dry Joint
Video History
Video Suspension control 1
Video Wheel positions
Video Suspension
Video Spring systems
Video Electr. Air Suspension
Video Center of Gravity
Video Oblique/lateral drift angle
Video Elasto-kinematics
Video Elk Test
Video Wheel Bearing 1
Video Wheel Bearing 2
Video Wheel Bearing 3
Video Wheel Bearing 4
Video Ind. pulse sensor
Video Wheel sensor 2
Video Transversal Axis
Video Suspension Carrier
Video Below View
Video Adj. suspension
Video Stabilizer 1
Video Stabilizer 2
Video Double-wishbone 1
Video Double-wishbone 2
Video Double-wishbone 3
Video Air suspension truck
Video McPherson Strut 1
Video McPherson Strut 2
Video McPherson Strut 3
Video McPherson Strut 4
Video Trailing Arm
Video Twist-beam Rear Axle
Video Space Arms
Video Multilink Axle
Video Semi-trailing Arm Axle
Video Rear-wheel Drive
Video Electr. Stab. Program
Video ABS/ESP-Hydr. Unit
Video One-arm Swing. Fork
Video Formula-3 Racing Car
Video Pend. Wheel Suspen.
Video Torson Crank Suspen.
Video DeDion Axle 1
Video DeDion Axle 2
Video Rigid Axle 1
Video Rigid Axle 2
Video Rigid Axle 3
Video Rigid Axle 4
Video Rigid Axle 5
Video Self steering axle
Video Track rod joint
Video Springs
Video Coil Spring 1
Video Coil Spring 2
Video Coil Spring 3
Video Leaf Spring
Video Torsion Bar Spring
Video Rubber Suspension
Video Hydropn. Suspension
Video Air Suspension 1
Video Air Suspension 2
Video Shock Absorber 1
Video Shock Absorber 2
Video Shock Absorber 3
Video Shock Absorber 4
Video Shock Absorber 5
Video Single-tube Damper 1
Video Single Tube Damper 2
Video Double-tube Damper
Video Shock Absorber Piston
Video Friction Absorber
Video Tyres
Video Wheel Positions

Video Tyre Calculation
Video Inch -> mm
Video Slip
Video Axle Load Distrib.
Video Payload Distrib.
Video Roller Resistance 2

Video Wheel suspension 1
Video Wheel suspension 2
Video Wheels 1
Video Suspension 1
Video Suspension 2
Video Suspension 5
Video Steering 1
Video Steering 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Electrical Power Steering

It supports and assists the steering process, exactly like the hydraulic power steering system does, because of it's lower installation weight however, it requires distinctly less energy, thus reducing the fuel consumption. The assistance is not generated permanently by the engine oil pressure and provides an energy-flow only then, when it's needed. This brings a saving of up to 90% e.g., on the motorway where less steering action takes place. One speaks of fuel savings of up to 0,2 liters per 100 km. Apart from that, all the power steering components are found in the vicinity of the steering and not also in the engine (hydraulic pump). An important aspect for the manufacturer: The individual components can be more easily adapted to the respective vehicle-types.

This also opens more possibilities for the constructive design of the steering. In the past, one expected the steering wheel to return to the center position automatically. It still does that, only now, it's electrically supported. Thus e.g., the caster and the steering inclination can be chosen for lower effort on the steering wheel. While these measures lead to more sensitivity, the city-mode is intended to be a practical assistance.

The introduction of electrical power steering meant that one could now actively influence the steering. Today, this is already reality in the case of the variable steering ratio. At times, the steering can be seperated from the actual steering wheel. Then (e.g., should a dangerous situation arise), the electronics can take over the steering of the wheels. In the event of the introduction of the 42-V network, the power steering could become even more interesting. In this case, even smaller electric motors could be used. The original idea was, that the steering should be completely decoupled, and that it would serve only as a sensor for the control device and that one servo-motor for each wheel, would do the steering of the front wheels. Indeed, for this to happen, legal regulations would first have to be altered. Apart from that, the steering - as opposed to maybe the braking system - is the the most difficult system to convert. One speaks of a triple-redundancy. It is simply not sufficient to duplicate everything, because then the control device still does not know, what it should actually do, and it must do something, e.g., if the electrical system collapses while driving in a curve.

Always then, when a movement of the steering wheel is detected, an electric motor engages, either through a worm-drive or a second gear-wheel, with the steering column or with the rack and pinion. The rotational direction of the motor depends on which way the steering wheel is turned. The recentering of the steering can also be supported. A further advantage is the possible steering assistance when being towed. In this case, the control device also takes the remaining battery tension into consideration.


The system requires not only the position of the steering wheel, but also information regarding the force with which the wheel is turned. A part of the steering column is thus constructed, that it twists, in itself, when steering takes place. The twist-angle is a measure of the steering torque. It is registered by the system, e.g., the same as the driving speed is. 09/11

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2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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