Challenge

Week-3 Challenge: ADVISOR Tool

SShalini Deshmukh1 Feb 2022

AIM:- To use ADVISOR tool and simulate following

1) For EV_defaults_in file, if cargo mass is 500kg with all other default conditions, can vehicle for 45km with FTP drive cycle.

2) in above case, try changing the battery capacity and repeat the simulation

3) perform gradeability test with PRIUS_jpn_defaults_ in file compare your results in table and conclude.

ADVISOR(Advance vehicle simulator):-

ADVISOR, NREL's advanced vehicle simulator, is a set of model,data and script text files for use with Matlab and Simulink. It is designed for rapid analysis of the performance and fuel economy of conventional, electric and hybrid vehicles. ADVISOR also provides a backbone for the detailed simulation and analysis of user defined drivetrain components, a starting point of verified vehicle data and algorithms from which to take full advantage of the modeling flexibility of simulink and analytic power of MATLAB.

Benifits:-

Estimate the fuel economy of vehicles that have not yet been built
Learn about how conventional, hybrid or electric vehicles use (and lose) energy throughout their drivetrains
compare relative tailpipe emissions produced on a no. of cycles
Evaluate an energy management strategy for your hybrid vehicles fuel converter
optimize the gear ratios in your transmission to minimize fuel use or maximize performance etc.

The model of advisor are:-

Mostly empirical, relying on drivetrain component input/output relationships measured in the laboratory and quasi-static, using data collected in steady state (for example, constant torque and speed) tests and correcting them for transient effects such as the rotational inertia of drivetrain components.

1) For EV_defaults_in file, if cargo mass is 500kg with all other default conditions,can the vehicle travel for 45 km with FTP drive cycle. Consideringthe the case for an typical EV, lets simulate EV_defaults_in,an electric vehicle with following specifications;

In the above example, a battery electric vehicle is modelled with following specifications:

Energy storage: Lead Acid battery with 25 modules having 308V as nominal voltage with 0.92 motor efficiency.

Motor: Manual

Drive: Front wheel drive

Cargo mass: 500kg

Next, we input the drive cycle FTP which is 17.7km long in distance. Hence inorder to drain the battery completely to soc=0% for calculating the range of vehicle, 4 drive cxycles are repeated, so that vehicle will travel 70.8km in total and we can find out at what distance the soc is 0.

In the above figure, first plot shows the drive cycle for which vehicle has travelled, the second plot shows the soc fall with time, the third graph shows emmisions and fourth graph shows the power output according to the throttle condition.

Hence, after running the simulation, we can see that, the soc becomes 0 after approximately 2.5 drive cycles. As shown at the right hand side,the distance travelled by vehicle is 41.4km.Hence the vehicle cannot travel 45km in a single charge.

2) In the above case, try changing the battery capacity and repeat the simulation:

In this case the same default conditions are taken that are initiate in above question and battery capacity will changed for accelerating the vehicle that will increase the vehicle distance travel km.

Increase the battery capacity of vehicle:-

So in order to achieve a range of 45 km, 3 more modules of batteries have been added making the total modules to 28 and nominal voltage to 345V.

In the above image, the vehicle travels a distance of 46.5km. Hence 28 no of battery modules are sufficient to satisfy a range of 45km according the problem description.

3) Perform GRADEABILITY test with PRIUS_JPN_DEFAULTS_IN file compare your results in table and conclude:

Following is the model of Toyota Prius parallel hybrid vehicle. It uses battery and an IC engine to power the wheels. As can seen from the figure, the differential is connected to motor and it is also connected to am IC engine via a device called as a power split device. Power split splits the power according to the throttle demands keeping the engine in maximum efficiency zone, providing additional power via battery and engine during aggressive conditions. charging the battery via a generator during conditions such as regenerative braking and preserving the energy efficiently.

Vehicle specifications:-

power produced by IC engine: 43kw with fuel convertor efficiency of 0.39

Battery Capicity: NMH(nickel Metal Hybride) batteries have been used with 40 modules producing a nominal voltage of 308V

Generator(Regenerative): 15kw

Motor: induction motor producing power of 15kw with 0.84 efficiency

Transmission: CVT

Drive: Front wheel drive

In order to perform the gradeability test. We keep the grade value constant and change the speed values to find out the maximum gradeability at an optimum speed simulating for 10s.