Challenge

Week-4 Challenge WOT Condition Part-2

Objective -

To compare the difference between mapped and dynamic model of engine, motor and generator.

Theory -

Difference between Mapped and Dynamic Models -

Mapped Models

Dynamic Models

Model uses a set of steady-state lookup tables to characterize engine performance.
The tables provide overall engine characteristics, including actual torque, fuel flow rate, BSFC, and engine-out exhaust emissions.
Mapped Models use backward facing approach.
Most of the components are modelled by steady state maps and charts in backward facing approach.
Mapped engine models are suitable for analysis and design activities that do not require engine subsystem dynamic characteristics.
Use -
- If you have engine data from a dynamometer or a design tool like GT-POWER.
- For quasi steady-state engine simulations.
Example - In engine and transmission owertraion matching analysis for fuel economy, emissions and performance trade-offs.

Model decomposes the engine behavior into engine characteristics that are separated into lower-level components.
By combining components in this way, the models capture the dynamic effects.
Dynamic Model uses forward facing approach.
Dynamic engine models are suitable for designing control, estimator, and diagnostics algorithms that depend on dynamic subsystem states.
Use -
- If you need a more detailed dynamic model and have component-level data.
- To analyze the impact of individual engine components on the overall performance.
Example - Closed loop AFR control algorithm development.

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Objective -

Theory -

Miles per Gallon (MPG) Calculation -

Given input parameters are
- Vehicle Speed
- Fuel Flow
- Battery Power
Battery Power is converted into kilowatts then converted into US EPA (kWh/USgal equivalent), then into `m^3` per gal.
This adds with Fuel Volume Flow, then integrte it with respect to time to get the total fuel volume and convert it into US Gallon.
The vehicle speed is integrated to get the total distance covered and convert it into miles.
By dividing Total fuel volume consumed (in US Gallon) to the Total distance covered (in miles), we get the desired output as miles per gallon.
The model for the miles per gallon is given below -

Factors affecting Fuel Flow -

NOTE :- Question 3 and 4 are omitted as per instruction of TSE Dr. Sree Ranjini K S.

Ship work like this
in your own course.