Transcript Crankshaft Position Sensor

By:
Mark Bright
and
Mike Donaldson
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Project Goal
Applications of our system
System Block Diagram
Thermal Plant Overiew
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Current Progress
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◦ Engine Side (Mark)
◦ Thermal Side (Mike)
The goal of our Engine Control Workstation is to
simulate thermal environments that are found in
liquid-based cooling systems.
With this simulation we are creating several different
control methods via MATLAB and Simulink that all
work together to control both the engine and
thermal transient responses.
Both of which combine to reduce system energy usage
Car Application
PC Application
Thermistor
Flowmeter
Pump
Cooling Block
Motor
Engine Control Workstation
Thermo Plant System
TMS320F2812
DSP Platform
TMS320F2812
DSP Platform
PC
PC
(Plant/Engine Control)
(Thermo Control)
MATLAB GUI Interface
MATLAB GUI Interface
- Command Velocity
- Controller Parameters (P, PI, PID, ?)
- Load
- Set Point (Temp Coolant or Plant)
- Pump Velocity
- Fan Velocity
MATLAB GUI Display
- Plant Velocity
- Motor Current
- Steady-State-error
- Transcient Response
- PWM%
- Controller Signal
MATLAB GUI Display
Energy Management/Control
- Flow Rate
- Radiator Outlet temp
- Radiator Inlet Temp
- Plant Temp
- PWM% ’s
X
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32-bit Processor
30 MHz Clock
16 A-D channels
12 PWM Digital I/O
Channels
128K on-chip Flash
memory
9 Ports total
3.3 v Supply
Interface with TI C2000
Simulink System
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What is it?
◦ Two Square Waves 90º
out of phase
How does this improve
accuracy?
◦ Four times as many
pulse counts
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Allows for ±5 RPM Error
Max
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Used in DSP Port 8 – Pins 6
and 7
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Drag QEP Block from Simulink
Code Below is Auto-Generated
from Simulink
Show as Inner Shaft RPM in
Code Composer
Show as Out Shaft RPM in GUI
Proportional, Integral Control
PI
Control was added
Integral Controller is (z/z-1)
K was tuned to .0005
Ess = ± 20RPM
All data is sent to the GUI
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Performed Bilinear Transformation in MATLAB
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Bilinear Transform converts an analog controller to a
digital controller
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Tuned Gain = 1/34.2 instead of 1/17.1 (inverse of plant)
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PI Control Only
FF Compensation
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100 RPM Step Input
Smaller time to first
Peak (Tp) by 20 mS
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Less Overshoot
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Ess=0
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User can input
desired RPM
Outputs: RPM, Duty
Cycle, Transient
Response
Updates in real
time
Will add more as
the project
continues
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Variable Resistance
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Anti-aliasing filter
X
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Conversion of A/D Value
to Temperature
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Excel Trendline
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Moving Average Filter
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Datatype conversions
Function auto-code
generated
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Interface from
digital to analog
Average Voltage
seen by the device
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Opto-Isolator
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TIP120 choice
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Design for 3A
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Increase Base current
Increase voltage from
12-volt regulator (more
later)
Does any PWM work ?
◦ 300mHZ !
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LPF to DC the PWM
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Ideal Op Amp theory
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Voltage @ Input =
Voltage @ Pump
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Nick Schmidt
◦ Case Assembly
◦ Hardware Assembly
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Motivation
◦ TIP 120 Vce drop 880mv
◦ 13.5 volts max for
pump/fan
* Linear/Switchmode Voltage Regulator Handbook
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OCHAN’s allow for data
to be outputted to:
◦ GUI
◦ Workspace
P = Vce * Ie
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Start, Type “guide” in
MATLAB
GUI can be designed
here with many
components
Once designed,
MATLAB autogenerates a .m file
and .fig file
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Started with Professor
Dempsey PWM Tutorial
Interfaced DSP Board,
Simulink and PWM for
Motor
Tutorial Contents:
 Simulink Model
 Auto-Gen .m file
 Auto-Gen .fig file
 Demo .m file
 DSP/Simulink Interface .m
file
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PWM Brush Type Servo
Amplifer – Model
10A8DD
Protected for overvoltage and overcurrent
DC Supply Voltage: 2080v
Peak Current: ±10A
Maximum Continuous
Current: ±6A
System Components
Total
Cost
Fan
$ 10.99
Radiator
$ 39.99
Cooling Block
$ 54.99
Reservoir and Pump
$ 116.99
Pump
$ 77.99
Flow Meter
$ 16.99
Coolant
$ 14.99
Cold Cathode
$ 10.99
Temp Sensors - (2)
$ 19.99
30V Power Supply
$ 142.00
TI TMS320F2812
DSP Boards - (2)
$ 938.00
120VAC Solenoid Valve
$ 41.00
30.3V Pittman Motor - (2)
$ 80.00
Misc - Wires, Tubing, Case
$ 20.00