In this paper, a model order reduction strategy is adopted for the static and dynamic behaviour simulation of high-speed tracked vehicle. The total number degree freedom structure condensed through selection interface degrees significant global mode shapes, an approximated description vehicle behaviour. methodology implemented in customised open-source software to reduce computational efforts. modelled includes sprung mass, unsprung masses, connected by means torsional bars, all track...

<div class="section abstract"><div class="htmlview paragraph">In the last decades, locomotion of wheeled and tracked vehicles on soft soils has been widely investigated due to large interest in planetary, agricultural, military applications. The development a tire-soft soil contact model which accurately represents micro macro-scale interactions plays crucial role for performance assessment off-road conditions since vehicle traction handling are strongly influenced by...

This paper aims at investigating powertrain behaviour, especially in transient dynamic responses, using a nonlinear truck vehicle model with parallel hybrid configuration. A power split control was designed to achieve the desired drivability performance, focus on NOx emissions. The controller characterized by high-level model-based logic used elaborate total torque required, and low-level allocation strategy for splitting between engine electric motor. final task enhance based driver...

In recent decades, the automotive industry has moved towards development of advanced driver assistance systems to enhance comfort, safety, and energy saving road vehicles. The increasing connection communication between vehicles (V2V) infrastructure (V2I) enables further opportunities for their optimisation allows additional features. Among others, vehicle platooning is coordinated control a set moving at short distance, one behind other, minimise aerodynamic losses, it represents viable...

Abstract The paper presents an anti-lock braking system (ABS) control logic based on the measurement of longitudinal forces at hub bearings. availability force information allows to design a that does not rely estimation tyre–road friction coefficient, since it continuously tries exploit maximum tyre force. is designed by means computer simulation and then tested specific hardware in loop test bench: experimental results confirm measured wheel can lead significant improvement ABS...

Based on observations of the behaviour optimal solution to problem energy management for plug-in hybrid electric vehicles, a novel real-time Energy Management Strategy (EMS) is proposed. In particular, dynamic programming results are used derive set rules aiming at reproducing gearshift schedule in mode while Adaptive Equivalent Consumption Minimization (A-ECMS) employed decide powertrain operating and current gear when power from internal combustion engine needed. terms total fuel...

This paper describes a mathematical model and presents the dynamic analysis of series-hybrid tracked tank driven by two electric motors, one devoted to propulsion (PM) other steering (SM). A double differential mechanism is adopted electrically produce speed difference between tracks required for skid steering. In this paper, specific transmission called Electro-Mechanical Transmission (EMT). The EMT supports motor control strategy definition size optimisation. Dynamic simulations applied 55...

This paper presents a methodology for the assessment of NVH (noise vibration and harshness) performance Dual Clutch Transmissions (DCTs) depending on some transmission design parameters, e.g. torsional backlash in synchronizers or clutch disc moment inertia, during low speed maneuvers. A 21-DOFs nonlinear dynamic model C-segment passenger car equipped with DCT is used to simulate behavior driveline estimate forces at bearings. The impacts between teeth two engaging components, gears...

Articulated tracked vehicles have been traditionally studied and appreciated for the extreme maneuverability mobility flexibility in terms of grade side slope capabilities. The articulation joint represents an attractive advantageous solution, if compared to traditional skid steering operation, by avoiding any trust adjustment between outside inside tracks. This paper focuses on analysis control articulated vehicle characterized two units connected through a mechanical multiaxial that is...

The paper investigates the torsional oscillations of an automotive transmission system by means experimental test bench used to validate proposed lumped parameter model. rig consists a Dual Clutch Transmission (DCT) and Manual (MT) connected through respective output shafts, while excitation is provided two electric motors, which are controlled in speed or torque. analysis includes measurement external torques, applied motors mechanical system, response terms angular speeds at different...

This paper presents the methodology adopted by Politecnico di Torino Vehicle Dynamics Research Team to obtain objective indices for evaluation of comfort during gear change process. Some test drivers and different passengers traveled on a vehicle assigned marks basis their subjective feeling gearshifts. The comparison between most significant evaluations experimental values obtained instruments located is presented. As consequence, some (based physical parameters) evaluate efficiency...

This paper deals with a powershift automated manual transmission, i.e. an transmission torque gap filler, which essentially integrates, in typical layout, filler assembly the aim of reducing that occurs during gearshifts. The consists additional mechanical link between engine and output shaft, thus enabling power to flow through this parallel path also when launch clutch is disengaged, clear benefits terms both sportiness passenger comfort. first part two-part study which, after general...

This paper explores the potentiality of reducing noise and vibration a vehicle transmission thanks to powertrain control integration with active braking. Due external disturbances, coming from driver, e.g. during tip-in / tip-out maneuvers, or road, crossing speed bump driving on rough torsional backlashes between rotating components (gears, synchronizers, splines, CV joints), may lead NVH issues known as clonk. study initially focuses positive effect performance concurrent application...

This paper introduces a method to characterize the dynamic behavior of normal production hydraulic brake system through experiments on hardware-in-the-loop test bench for both modeling (part I) and control II) tasks. The activity is relative analysis, modeling, anti-lock braking electronic stability digital valves, aimed at obtaining reference tracking disturbance-rejection performance similar that achievable when using pressure proportional valves. first part this two-part study focused...

Brake systems represent important components for passenger cars since they are strictly related to vehicle safety: Anti-lock Braking Systems (ABS) and Electronic Stability Control (ESC) the most well-known examples. The paper is focused on characterization of braking hydraulic plant design a pressure following control strategy. This strategy aimed at pursuing performances and/or comfort objectives beyond typical safety task. low-level logic (focus paper) consists Feedforward Proportional...

This paper investigates the torsional dynamic behaviour of a Dual Mass Flywheel (DMF) both numerically and experimentally. First, experimental setup is described, followed by mathematical description in frequency domain mechanical system under test, using lumped parameter model. An analytical expression for response function describing rotational dynamics derived compared with data. Sine sweep tests are used to characterise system, imposing constant amplitude excitation, i.e. torque applied...

Vehicles equipped with Automated Manual Transmissions (AMT) for gear shift control show many advantages in terms of reduction fuel consumption and improvement driving comfort shifting quality. In order to increase both performance efficiency, an important target is focused on the minimization typical torque interruption during shift, especially front conventional automatic transmission. Recently, AMT are proposed be connected planetary gears friction brakes, reduce gap change process. This...

This paper deals with the design of a brake caliper pressure controller for conventional anti-lock braking system/electronic stability control system and experimental validation its tracking performances. The analysis hydraulic plant, carried out in part I this two-part study, is here utilized to develop algorithm. strategy based on feed-forward proportional integral through pulse width modulation constant frequency variable duty cycle. contribution requires modeling nonlinear open-loop...

<div class="section abstract"><div class="htmlview paragraph">In the last few years, number of Advanced Driver Assistance Systems (ADAS) on road vehicles has been increased with aim dramatically reducing accidents. Therefore, OEMs need to integrate and test these systems, comply safety regulations. To lower development cost, instead experimental testing, many virtual simulation scenarios be tested for ADAS validation. The classic multibody vehicle approach, normally used design...