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Politecnico di Torino
Academic Year 2014/15
01NHZLO
Automotive fluid power systems
Master of science-level of the Bologna process in Automotive Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Rundo Massimo ORARIO RICEVIMENTO A2 ING-IND/08 40 10 10 0 10
SSD CFU Activities Area context
ING-IND/08 6 D - A scelta dello studente A scelta dello studente
Subject fundamentals
The module presents and examines automotive fluid power components and systems in terms of their graphical symbols, layout, specific features, construction and operation. Students learn how to identify and interpret fluid power circuits, comprehend and explain their purpose in relation with their constitutive components. Aim of the course is to acquaint students with methods for the analysis and critical evaluation of fluid power components and systems specific to automotive applications.
Expected learning outcomes
Upon completion of this module students should be able to identify the main fluid power components, their specific function and operation, to interpret correctly their purpose within a fluid power system and to determine and contrast from a technical point of view the use of a component or of a whole system in relation to its end use.
Prerequisites / Assumed knowledge
Awareness of concepts covered in Physics, Fluid Mechanics, 3D Modelling
Contents
• Fundamentals of Fluid Power (5 hours).
• Positive displacement pumps and motors (8 hours): different designs, real steady-state characteristics, instantaneous flow rate and torque, volumetric and mechanical-hydraulic efficiencies, flow and torque losses models, evaluation of the displacement. Controls for displacement variation.
• Fluid Power valves (5 hours): on-off directional control valves; flow and pressure control valves, single and double stage; ideal and real performance characteristics.
• Accumulators (1 hour): types and their dimensioning criteria.
• Flow generating units (8 hours): constant and variable flow rate, for open and closed circuits; constant pressure; ideal and real performance characteristics.
• Hydrostatic steering systems for passenger cars and off-road vehicles (7 hours): working principles, mechanical position feedback, analysis of sections of the rotating directional control valves, fixed and variable displacement pumps.
• Hydrostatic braking systems (7 hours): brake booster, vacuum pump, tandem master cylinder, ABS modules (from 2S to 8). The ESP integration for lateral stability.
• ICE lubrication systems (10 hours): layout (wet and dry sump solutions), oil path and pressure distribution inside the crankshaft; journal bearings: pressure distribution (Sommerfeld and Ockvirk bearings), load capacity, through flow, friction torque; cooling jets; fluid conditioning group; hydraulic lash adjusters; lubricating pumps, fixed and variable displacement, with discrete pressure controls; evaluation of the pressure and flow rate through the circuit as function of oil temperature and engine speed. Basic properties of the lubricants.
Delivery modes
Two sessions of mandatory laboratory work (1.5 hours each) are carried out in teams:
• Pumps, motors and linear actuators: various positive displacement pumps and motors (external and internal gear, axial and radial piston and vane machines) of different manufacturers are disassembled, analysed and contrasted to understand and appraise their peculiarities and mode of operation.
• Steering servo systems and electro-hydraulic braking systems: the main components are disassembled and analysed.
Four sessions of mandatory Laib work (1.5 hours each) are carried out. Briefly introducing a simulation environment (AMESim), problems in modelling and simulation of simple components and systems are presented. Students have the opportunity to perform simulations to gain direct experience of the approach and gain perception of the involved potentials.

A written report about one of the laboratory topics must be prepared and presented at the examination
Texts, readings, handouts and other learning resources
Slides will be progressively made available only to enrolled students on the Didactic Web Portal of the Politecnico.
The entire set of slides used in lectures in printed form will be also available at the beginning of the didactic term:
•Nervegna, N., Rundo, M.: Automotive Fluid Power Systems. Politeko, Torino
For additional insight into specific topics reference is made to the following material (in Italian):
•Nervegna, N.: Oleodinamica e pneumatica: Sistemi. Vol. 1, Politeko, Torino
•Nervegna, N.: Oleodinamica e pneumatica: Componenti. Vol. 2, Politeko, Torino
•Nervegna, N.: Oleodinamica e pneumatica: Esercitazioni. Vol. 3, Politeko, Torino
•Gilardino, L.: Esercizi di Oleodinamica, Clut, Torino
Some additional information (bibliography, links, animations) can be found on the official web site of the Fluid Power Laboratory (http://www.fprl.polito.it).
Assessment and grading criteria
During the course 5 numerical exercises will be progressively proposed on the Didactic Web Portal of the Politecnico. This homework must be downloaded and solved individually, according to explicit rules, by all students. The purpose of the homework is twofold: a self-assessment of acquired knowledge and competence; a training route toward the final written test. When successfully registering the exam, students must hand in the complete set of their own homework.
At the end of the course the final exam is grounded on a two-hour written test involving numerical evaluations on a proposed problem as well as theoretical questions on concepts and principles exposed during the lectures and laboratory sessions.
Some examples of written tests will be available on the Didactic Web Portal.
For those who reach in the written test a mark in the range:
•above 20/30 the oral examination is optional,
•from 15/30 to 20/30 an additional oral examination is required to pass the exam,
•below 15/30 the exam is failed.
In case of oral exam, the final mark will be the average between oral and written exams.
The oral exam will focus on lectures, laboratory topics and homework.

Programma definitivo per l'A.A.2014/15
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