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MCSact/cont/ref = actual, control and reference
torque on crankshaft
p = pulley
pk = number of pole pairs (k =
BSG, CS)
Rk = coil resistance (k = BSG, CS)
RpAT = wrap radius on automatic belt tensioner pulley
Rpi = wrap radius on i-th pulley (i =
AC, BSG,CS,IDL)
T = belt tension
Vdk = direct voltage (k = BSG, CS) Vqk = quadrature voltage (k =
BSG, CS)
αAT = wrap angle of the automatic ten- sioner pulley
θ = angular displacement of the pul- ley
θBSGact/cont/ref = actual, control and reference an-
gular of displacement of belt- starter generator
ωBSGact/cont/ref = actual, control and reference an-
gular velocity of belt-starter gen- erator
ωCSact/cont/ref = actual, control and reference an-
gular velocity of crankshaft pul- ley
ωpAC/AT/BSG/CS/IDL = angular velocity of the air
conditioning, automatic tensioner, belt-starter generator, crankshaft and idler pulley
ωBSG/CS = angular velocity of belt-starter
generator and crankshaft
BSG and the crankshaft of the ICE allows to reproduce the different operating conditions of the iBDS. In addition, it is fundamental for taking into account the crankshaft oscillations due to the overlapping of the harmonics. The harmonics are generated via the Electronic Control Unit (ECU) in a predictable and repeatable manner.
The aim of this work is to describe the design and the obtained characteristics of the belt transmission test rig, highlighting its versatility. At first the main components of the test rig are described and complete details regarding the control and monitoring system are provided. Secondly the model of the system, pided into its main components, is presented and used for the definition of the specifications of the two electric motors.
2. EXPERIMENTAL SETUP AND TEST RIG CHARACTERISTICS
The design was performed to obtain the maximum ver- satility and allow the test rig reproducing different kind of BDS, both for what the mounting solutions and the characteristic of the components are concerned. The aim of the present section is to give an overview of the test rig and illustrate its main characteristics.
2.1 Mechanical layout
Fig. 1 shows the geometric configuration of the test rig from the top view. The layout reproduces the setup of a real engine front end, where the BDS connects five com- ponents: crankshaft, BSG, air conditioning compressor, automatic tensioner, idler pulley. The power is transmitted by a V-ribbed belt with 5 ribs. The layout was reproduced in a horizontal plane to have a uniform distribution of the forces acting on the frame and to avoid possible bending stresses on the bearing structure. The mounting solutions of the pulleys were adopted to allow the substitution of each pulley with others of different radii or coupled with belts of different number of ribs or type. The crankshaft