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Automatic Windshield Wiper system E-552 Sensors and Actuators INSTRUCTOR: DR. Mohan Krishnan

Automatic Windshield Wiper system E-552 Sensors and Actuators INSTRUCTOR: DR. Mohan Krishnan. Presented by: Divesh Mittal Steven Lee. Contents. Objective / Introduction Physics of Optical Sensor Practical Setup Labview TM code/ Flow chart Conclusion / Final Comments Question???.

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Automatic Windshield Wiper system E-552 Sensors and Actuators INSTRUCTOR: DR. Mohan Krishnan

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  1. Automatic Windshield Wiper systemE-552Sensors and ActuatorsINSTRUCTOR: DR. Mohan Krishnan Presented by: Divesh Mittal Steven Lee

  2. Contents • Objective / Introduction • Physics of Optical Sensor • Practical Setup • LabviewTM code/ Flow chart • Conclusion / Final Comments • Question???

  3. Objective • Selection and study of particular application of sensor. • Automated windshield wiper system. • Prepare demo setup.

  4. Automated Windshield Wiper System • What is automated windshield wiper system? • Who commercialized it?

  5. Significance • Active Safety • Automation better than manual

  6. Possible Transduction Mechanism • Conductive transduction mechanism • Piezoelectric transduction mechanism • Optical transduction mechanism

  7. Where are we?? • Objective • Physics of Optical Sensor • Practical Setup • LabviewTM code/ Flow chart • Conclusion / Final Comments • Question???

  8. Refraction θr Air Air Glass Glass θi θi Total Internal Reflection Reflection θi>θcrit (a) Reflection and Refraction (b) Total Internal Reflection Physics of Optical Sensor • Optical sensor works on concept of reflection and refraction. • At critical angle of incidence only reflection occurs.

  9. Physics of Optical Sensor Contd.. • Critical angle of incidence for some material combinations

  10. Physics of Optical Sensor contd.. • Angle of incidence is kept slightly more than critical angle for Windshield material/air combination. • Presence of rain changes critical angle value.

  11. Where Are We?? • Objective / Introduction • Physics of Optical Sensor • Practical Setup • LabviewTM code/ Flow chart • Conclusion / Final Comments • Question???

  12. Practical setup • Servo Motor • Wiper • PMMA plate • PMMA 90∘Prism • Phototransistor: QSD124 880nm wave length • IR LED: QED223 AlGaAs 880nm • Resistor: 1KΩ for Phototransistor; 910Ω for IR LED. • PCI DAQ 9024E

  13. Measure area 2 Plastic 1 Air 3 Prisms IR Phototransistor IR LED Practical setup

  14. Rain Sensor Measure Area Practical Setup

  15. Practical Setup IR Phototransistor IR LED

  16. Where Are We?? • Objective / Introduction • Physics of Optical Sensor • Practical Setup • LabviewTM code/ Flow chart • Conclusion / Final Comments • Question???

  17. Labview coding

  18. IR LED IR Phototransistor Servo Motor Wiper Labview DAQ card Rain - PC Wiper Wiper System Control Chart

  19. Demo Video

  20. Where Are We?? • Objective / Introduction • Physics of Optical Sensor • Practical Setup • LabviewTM code/ Flow chart • Conclusion / Final Comments • Question???

  21. LabviewTM Results

  22. No rain condition

  23. Less water on windshield

  24. More water on windshield

  25. Final Comments/ Conclusion • Mechatronic systems are best option for active safety systems. • Rain sensor is effective control system to replace manual wipers.

  26. Limitations • Motor speed constant • Smaller sensitive area

  27. Questions

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