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In order to expand the product design and development capabilities of Electric Power Steering (EPS) system, a passenger car’s simulation model integrated with EPS system model will be made. Some analytical investigation is conducted in this paper. Through simplifying the architecture model of EPS system, the mathematical equation expressions of steering wheel and column, worm gear reducer, rack and pinion, steer-wheels, brushed DC electrical motor, and ECU assistance and compensation laws will be described. A number of tests on the EPS full system and subsystems and components will be executed. The tests’ results will be used as the input parameters of the model, and then be used for model validations. After that, the EPS system model will be created. Since the most important part of control logic strategy is the top secret of steering assembly supplier and it could’t be provided to OEM in details or not even a black-box model directly.

The paper describes a theoretical and experimental approach to solve vibration and noise problems in the powertrain with vibration control products on an elastomer basis. Crankshaft dampers can reduce the torsional, and - if properly tuned and designed - also the bending vibrations. The paper compares the crankshaft vibrations for different damper designs which shows the potential for further vibration and noise reductions. Shafts in the drivetrain are excited to torsional and bending vibrations by the inertia and gas forces of the engine, cardan joints and gear mesh. For the following two problems vibrations and noise are investigated: 1 A torsional resonance of a driveshaft 2 A bending resonance of a halfshaft Measurements show that noise and vibrations from the drivetrain can also be reduced significantly with tuned elastomer dampers.