The vehicle s combustion engine does not have to power the hydraulic pump, which means that during straight driving the electric motor does not need to work and therefore, it does not consume energy during these time periods. smaller size, simplicity of construction, lower price and lower fuel consumption (2-5%). The main advantage of these systems is that they are independent of the vehicle s motor operation (possibility of providing effort assist when the engine is switched off - towing, manoeuvres at petrol stations). ![]() Advanced electro-hydraulic power steering systems have many benefits. However, after an analysis of available solutions it can be concluded that they do not seem to be state of the art anymore and should be replaced by more sophisticated solutions. Nowadays, most commonly used is the hydraulic power steering system. Using more complex electrical braking architecture a full by-wire solution that provides the maximum flexibility concerning the component s positioning and the braking strategies can be implemented. This permits driving in pure electric mode for hybrid vehicles with both: engine and electric motor. The simplest solution is the implementation of an Electric Vacuum Pump in order to remove the one driven by the crankshaft. In general, all solutions fulfil the functional and safety requirements for braking electrification, but there are many differences between the systems regarding their complexity. Obviously the costs cannot be well-defined until the number of pieces that will be manufactured is determined. To choose the best one many aspects must be taken into account, the most important factor is the system s functionality but also costs and dimensions have to be considered. Conclusions Many solutions have been investigated for the electrification of braking auxiliaries. Their installation, working principles, effect on fuel consumption and other advantages and disadvantages were investigated. ![]() Concerning the steering systems different options are compared: the hydraulic, the electro hydraulic and the electric one. Afterwards, several supplier solutions are reviewed in order to get a global overview what is the state of art for the braking system s electrification. ![]() First a general description of the operation principle of a normal production (NP) hydraulic braking system is presented. Level PU HYBRID COMMERCIAL VEHICLE (HCV) DELIVERABLE D TECHNOLOGY EVALUATION REPORT FOR ELECTRICAL ACTUATED MECHANICAL BRAKES AND ELECTRICALLY POWERED STEERING SERVO HCV Hybrid Commercial Vehicle D2300.1, Rev_1 page 1 of 39ΔΆ Summary This report contains a general overview of today s possible solutions for the electrification of braking auxiliaries as well as the electric and electro-hydraulic steering. Subject: Auxiliaries for chassis function Technology evaluation DELIVERABLE REPORT Date WP No 2300 (39) Report No D Dissem. Issuer (Name, Organisation) Paravizzini Pier Paolo, CRF May 2013 Dawid Szkucik, SOLARIS BUS & COACH S.A. 1 Responsible (Name, Organisation) Dawid Szkucik, SOLARIS BUS & COACH S.A.
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