Design of Power Steering Systems for Heavy-Duty Long-Haul Vehicles

Silvas, Emilia; Backx, EA; Hofman, Théo; Voets, Henk; Steinbuch, M Maarten

doi:10.3182/20140824-6-za-1003.02780

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…In this method, several steps are performed 1 The superscript 1 does not refer to "C to the power 1" but indicates the first velocity class.…”

Section: Existing Driving Cycle Synthesis Methodsmentioning

confidence: 99%

“…For example, for a 0.2-m/s (0.72 km/h) bins width, all v(t) ∈ [0, 0.2] m/s are in the first velocity class C 1 , all velocities v(t) ∈ [0.2, 0.4] m/s are in the second class C 2 , and so forth. 1 Thus, prior to the cycle synthesis method, the velocity vector is defined as…”

Section: Existing Driving Cycle Synthesis Methodsmentioning

confidence: 99%

“…In the design process of a HEV, a drive cycle is necessary to evaluate its fuel consumption, emissions, and performance. Furthermore, once this driving cycle is known, one can determine the mission of the vehicle, the optimal component sizes, and the costs of hybridization [1], Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Realistic Driving Cycles With High Accuracy and Computational Speed, Including Slope Information

Silvas

Hereijgers

Peng

et al. 2016

IEEE Trans. Veh. Technol.

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This paper describes a new method to synthesize driving cycles, where not only the velocity is considered but the road slope information of the real-world measured driving cycle as well. Driven by strict emission regulations and tight fuel targets, hybrid or electric vehicle manufacturers aim to develop new and more energy-and cost-efficient powertrains. To enable and facilitate this development, short, yet realistic, driving cycles need to be synthesized. The developed driving cycle should give a good representation of measured driving cycles in terms of velocity, slope, acceleration, and so on. Current methods use only velocity and acceleration and assume a zero road slope. The heavier the vehicle is, the more important the road slope becomes in powertrain prototyping (as with component sizing or control design); hence, neglecting it leads to unrealistic or limited designs. To include the slope, we extend existing methods and propose an approach based on multidimensional Markov chains. The validation of the synthesized driving cycle is based on a statistical analysis (as the average acceleration or maximum velocity) and a frequency analysis. This new method demonstrates the ability of capturing the measured road slope information in the synthesized driving cycle. Furthermore, results show that the proposed method outperforms current methods in terms of accuracy and speed.Index Terms-Driving cycle compression, hybrid electric vehicle (HEV) design, multidimensional Markov chains, slope and velocity synthesis.

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“…In this method, several steps are performed 1 The superscript 1 does not refer to "C to the power 1" but indicates the first velocity class.…”

Section: Existing Driving Cycle Synthesis Methodsmentioning

confidence: 99%

Section: Existing Driving Cycle Synthesis Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Realistic Driving Cycles With High Accuracy and Computational Speed, Including Slope Information

Silvas

Hereijgers

Peng

et al. 2016

IEEE Trans. Veh. Technol.

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“…Moreover, the body also houses check valves to avoid cavitation at the steering cylinders lines. The steering unit houses two orbital motors labeled in Figure 2 with numbers (8) and (11) (60 cm 3 /rev and 185 cm 3 /rev, respectively): during normal operation both the orbital motors are working; during an emergency, when the fluid power unit for some reason is not working and the pressure on the delivery line drops under 7-8 bar, the bigger orbital motor (11) is instead isolated thanks to a "shift valve" (13)(14). In this condition the steering of the vehicle tires is still possible acting on the steering wheel, which rotates the spool till its end-stop; at this point, continuing the rotation of the steering wheel and thanks to the pin, the spool drags the sleeve in rotation, and the sleeve drags the internal gear of the orbit to rotate itself.…”

Section: Description Of the Hydrostatic Steering System And Its Operamentioning

confidence: 99%

Modelling and Simulation of a Hydrostatic Steering System for Agricultural Tractors

et al. 2018

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Abstract:The steering system of a vehicle impacts on the vehicle performance, safety and on the driver's comfort. Moreover, in off-road vehicles using hydrostatic steering systems, the energy dissipation also becomes a critical issue. These aspects push and motivate innovation, research and analysis in the field of agricultural tractors. This paper proposes the modelling and analysis of a hydrostatic steering system for an agricultural tractor to calculate the performance of the system and determine the influence of its main design parameters. The focus here is on the driver's steering feel, which can improve the driver's behavior reducing unnecessary steering corrections during the working conditions. The hydrostatic steering system is quite complex and involves a hydraulic circuit and a mechanical mechanism to transmit the steering to the vehicle tires. The detailed lumped parameters model here proposed allows to simulate the dynamic behavior of the steering system and to both enhance the understanding of the system and to improve the design through parameters sensitivity analysis.

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“…More recent studies have also tried to show the influence of topology change of one or more components [12]- [20] or to integrate the topology selection, as a discrete choice, with the sizing and control of components [21]- [23]. Yet, no methodology exists to build or determine suitable topologies candidates for these sizing or control studies and, as substitute, a discrete and limited set of topologies is used.…”

mentioning

confidence: 99%

Functional and Cost-Based Automatic Generator for Hybrid Vehicles Topologies

Silvas

Hofman

Serebrenik

et al. 2015

IEEE/ASME Trans. Mechatron.

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Abstract-The energy efficiency of a hybrid electric vehicle is dictated by the topology (coupling option of power sources/sinks), choice (technology) and control of components. The first design area among these, the topology, has the biggest flexibility of them all, yet, so far in literature, the topology design is limited investigated due to its high complexity. In practice, a predefined small set of topologies is used to optimize their energy efficiency by varying the power specifications of the main components (sizing). By doing so, the complete design of the vehicle is, inherently and to a certain extend, sub-optimal. Moreover, various complex topologies appear on the automotive market and no tool exists to optimally choose or evaluate them. To overcome this design limitation, in this work, a novel framework is presented that deals with the automatic generation of possible topologies given a set of components (e.g., engine, electric machine, batteries or transmission elements). This framework uses a platform (library of components) and a hybrid knowledge base (functional and cost-based principles) to set-up a constraint logic programming problem and outputs a set of feasible topologies for hybrid electric vehicles. These are all possible topologies that could be built considering a fixed, yet large, set of components. Then, by using these results, insights are given on what construction principles are mostly critical for simulations times and what topologies could be selected as candidate topologies for sizing and control studies. Such a framework can be used for any powertrain application, it can offer the topologies to be investigated in the design phase and can provide insightful results for optimal design analyses.Index Terms-automatic topology generator, platform based design methodology, hybrid electric vehicles, constraint logic programming over finite domains.

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Design of Power Steering Systems for Heavy-Duty Long-Haul Vehicles

Cited by 9 publications

References 14 publications

Synthesis of Realistic Driving Cycles With High Accuracy and Computational Speed, Including Slope Information

Synthesis of Realistic Driving Cycles With High Accuracy and Computational Speed, Including Slope Information

Modelling and Simulation of a Hydrostatic Steering System for Agricultural Tractors

Functional and Cost-Based Automatic Generator for Hybrid Vehicles Topologies

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