Team Hybrid Hoyt Member Subsystem Sean Frost Electric motor, motor controller, charge controller, charge accumulators Dan Farley Hydraulics system: Pumps, motors, valves, accumulators John Hoyt Internal Combustion Engine: Sensors, design of clutches for ICE and electric motor
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Team Hybrid Hoyt MemberSubsystem Sean Frost Electric motor, motor controller, charge controller, charge accumulators Dan Farley Hydraulics system: Pumps,
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Team Hybrid
Hoyt
Member Subsystem Sean Frost Electric motor, motor controller,
charge controller, charge accumulators
Dan Farley Hydraulics system: Pumps, motors, valves, accumulators
John Hoyt Internal Combustion Engine: Sensors, design of clutches for ICE and
electric motor
Background Information
Hoyt
• Conventional drive train- torque is applied from an internal combustion engine
• Hybrid vehicle drive train- An electric motor and/or an internal combustion engine can apply torque to the drive wheels
ICE
Axle Assembly
Power Split Device
ICE Generator
Electric Motor
Axle Assembly
Battery Bank
Generator
Electric Motor
Axle Assembly
ICE
Conventional Hybrid- Parallel Hybrid- Series
Problem Statement:
Vermont Technical College would like to compete in the Dartmouth Thayer School of Engineering Formula One Hybrid Racing Competition, but we do not currently have a vehicle that meets the specifications.
Farley
Solution Statement:
To develop and demonstrate a hybrid propulsion system which meets the following requirements
1. Comprises both an internal combustion engine (ICE) and an electrical storage unit with electric drive
2. The system shall meet all electrical specifications and requirements for the 2007 Dartmouth Thayer School of Engineering Formula One Racing Competition.
3. The drive system may deploy the ICE and electric motor(s) in any configuration including series and parallel.
4. Final design will allow the drive train system to be adapted to a chassis developed in a separate effort. Farley
Competition Overview
There are three events in the competition: Acceleration- teams compete for best time
over a 75m sprint Autocross- teams test car’s agility and
performance in hill climbing, acceleration, cornering, stability, etc.
Efficiency- teams compete to maximize fuel efficiency while driving a set distance
A three position selector switch will maximizeperformance and/or efficiency for each event
Farley
Frost
Hybrid Propulsion System Overview
Low PressureFeedback
Battery Bank
ICE
Generator
Electric Motor
Power Split Device
Axle Assembly
Acc
um
ula
tor
V+
V+
HydraulicPumps
4 port, 2 way valve
Check valves
• The rotational input from both the electric motor and ICE will drive hydraulic pumpsto pressurize the accumulator. The hydraulic pressure will act on hydraulic motors positioned at the drive wheels to power the vehicle.• Regenerative braking will allow the hydraulic motors to pressurize fluid back into theaccumulator for future use.
Electric Motor/GeneratorInternal Combustion Engine
Frost
VisSim System Simulation
Frost
Refined
The current ICE power output would need to be upgraded by 6 to 7 times to meet the load requirements of the System.
The electronic generator would marginally fall short at certain operating conditions (i.e. full acceleration mode).
Determined the available sum of torques between the motors which was used to perform calculations to select the hydraulic components.
Frost
Hoyt
Team Hybrid Budget to date April. 17th
Proof of Concept
Due to cost and time limitations, two prototype subsystems were developed:
Power coupling and control of the ICE, electric motor, electronic clutches
Pneumatic model actuated by microcontroller which demonstrates drive mode and regenerative braking
Hoyt
Proof of Concept – System IPower Coupling
Hoyt
ICE
Electric motor
Clutch Assembly
Battery
Differential
Generator/Alternator
A parallel hybrid system allows the internal combustion engine and electric motor to operate independently or simultaneously.
This prototype portrays the combination of power from the two motors and switches between series and parallel operating modes.
This prototype will be used to test our motor control software in varying operating conditions.
Proof of Concept – System IIHydraulic (pneumatic) Drive Concept
Farley
HC08
Gas Brake
Stepper Motor
Pneumatic Motor
Manifold
Piston
Team Hybrids’ particular design reveals a more unconventional method of regenerative braking.
In order to effectively capture and distribute power, software has been developed for the system.
This prototype was used to test the functionality and rationality of the software.
Summary
Team Hybrid has designed a hybrid propulsion system that meets the required specifications for the Thayer School of Engineering Formula One Hybrid Competition.
A hybrid drive control system was developed and is demonstrated in two prototype subsystems to illustrate regenerative braking, power coupling and control of the ICE and electric motor.