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Experimental Engineering Thermal Control System (EETCS)

Experimental Engineering Thermal Control System (EETCS). Group 18 Lucas Chokanis Daniel Ramirez Lloyd Harrison Philip Teten. Motivation. A Proposal from Researchers to Implement Their Algorithms

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Experimental Engineering Thermal Control System (EETCS)

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  1. Experimental Engineering Thermal Control System(EETCS) Group 18 Lucas Chokanis Daniel Ramirez Lloyd Harrison Philip Teten

  2. Motivation • A Proposal from Researchers to Implement Their Algorithms • Design an Experimental Thermostat to Control a Vehicle’s Heating, Ventilation, and Air Conditioning (HVAC) Systems • Provide a Control System that is Feasible to adapt for Future Modifications

  3. Objectives • Ability to Detect Input: • Temperature of the Vehicles Interior • Temperature of the Blower Motor • Extra Temperature Sensor for Researchers Use • Control Output: • Speed of the Blower Motor (High, Med, & Low) • Speed Command of the PMSM Motor • Condenser Fan • Clutch Control • Implement a User Interface • LCD Screen and LED’s for Feedback • Push Buttons for User Control

  4. Challenges • Electrically Noisy Environment: • Use of Parts that Meet Automotive Requirements • 15 ft Transmission Lines: • PMSM Motor Control • Two Remote Temperature Sensors • Highly Intuitive Programming: • Giving Researchers Ease of Understanding • Communicating Multiple Temperature Readings Via SPI Bus

  5. Specifications and Requirements • Voltage Received: • 12 to 15 VDC • Output to Motors: • 12 VDC Three Speed Blower Motor Control • High, Medium, Low • 12 VDC Condenser Fan • 12 VDC Clutch Control • Linear 0 to 2.63 VDC “Step” Speed Command • Relays: • Four 15 Amp Relays • One 30 Amp Relay • Coil Voltage of 12 VDC • Microcontroller • MSP430 or C2000

  6. The Proposed System

  7. Microcontroller

  8. Microcontroller

  9. Microcontroller The chosen microcontroller is the MSP430F2274-Q1for the following reasons: • Ultra-Low power • Code Composer Studio IDE • Qualified for Automotive Applications • Sponsor provided the MSP430 Target board and USB programmer

  10. Temperature Sensors

  11. Temperature Sensors • Ambient temperature Sensor: • Housed on main thermostat circuit board. • Provides feedback to the user via LCD screen • Blower Motor Temperature Sensor: • Remote sensor location. • 15ft away from main board as required by the customer. Its purpose is to keep track of the rate at which the blower motor is cooling. • Auxiliary Temperature Sensor: • Remote sensor location (<15ft away from main board).

  12. Temperature Sensors

  13. Temperature Sensors The chosen temperature sensors were the ADT7320 for the following reasons: • Very high accuracy rating on a wide temperature scale. • We can expect reliable temperature readings in a cold environment such as the evaporator. • User programmable with multiple features • Temperature resolution up to 16-bits.

  14. Temperature Sensors

  15. Temperature Sensors Communication • Extending The SPI Bus for Long Distance Communication: • For the remote sensors, it is possible that propagation delay could be significant enough to hinder data transmission. • Once we attempt to conduct SPI communications at distances greater than 15 feet, we will know if propagation delay will require a hardware solution. • If this turns out to be the case, dual differential transceivers will be used to refresh the clock signal protect the data transfer from noise. • If the signal is fed back to the master from the slave, data transmissions between the master and slave will occur at the same delayed clock signal.

  16. Temperature Sensors Communication

  17. Sensor Initialization • Although the ADT7320 sensor performed above our expectations, we realized that an initialization subroutine was required for it to function reliably.

  18. User Interface

  19. User Interface

  20. User Interface • 4 Digits 1 Decimal Accuracy

  21. LCD Display and Driver • Driver Uses Less Pin Outs • Good for Intuitive Programming

  22. LCD Display and Driver

  23. User Interface • View Changing: Scroll Through

  24. User Interface • Temperature Set for Nominal Setting

  25. User Interface • Setting the Blower Motor State

  26. User Interface

  27. PMSM Communication

  28. PMSM Communication

  29. Power and Motor Control

  30. Motor Control Solid-State Relays (SSRs) Vs. Electromechanical Relays:

  31. Motor Control Motor Control: Choosing Relay Current Rating Blower motor current draw (low, medium, and high speeds) Note: Highlighted values are interpolated values due to limitations in test equipment.

  32. Motor Control Motor Control: Choosing Relay Current Rating Condenser Fan Motor Current Draw Note: Highlighted values are interpolated values due to limitations in test equipment.

  33. Motor Control

  34. Power Current Draw

  35. Power 3.3V P/S EFFICIENCY 5V P/S EFFICIENCY

  36. Power Regulator Efficiency

  37. Power

  38. Power

  39. Power

  40. The Proposed System

  41. Board Layouts (Board 1)

  42. Board Layouts (Board 2)

  43. Administrative Content

  44. Progress

  45. Questions?

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