SELF INFLATING TIRES

A SEMINAR PRESENTATION ON SELF INFLATING TIRES

1. SHRI RAMSWAROOP MEMORIAL GROUP OF PROFESSIONAL COLLEGES TEWRIGANJ 227-105 Seminar Presentation Topic- Self Inflating Tires Presented By Faraz Arif B.Tech 3 rd Year (Mechanical Engineering) 1612240073 M.E - 53

2. Introduction: The Self inflating tires are designed to inflate or deflate tires automatically . Tires need more air while driving on hard surfaces at high Speed and less air for driving on s oft s urfaces such as soil or sand . The driver of The vehicle will Select an appropriate tire pressure from inside the vehicle

3. Why is it needed? During a survey most of the accident are due to uneven inflation of tires. 78% of India rides on incorrect tire pressure? In this survey, Almost 44% of the car tire were over inflated and 34% Over-inflated tire decrease the efficiency and are prone to burst at high speed resulting in collision. Under-inflated or deflated tire has vehicle handling, leading to accident due to lack of control.

4. Basic Review- Tires-inflation systems Job: Detect when the air pressure in a Particular tire has dropped. Notify the driver of the problem. Inflate that tire back to the proper Level.

5. Types of self inflating tire system- CTIS (Central Tire Inflation S ystem ) TMS (Tire M aintenance S ystem ) AIRGO System.

6. Common Elements of Inflation System- They use valve to isolate individual Tires to prevent airflow. They have a method for sensing the Tire pressures.. They have an air source. There's a way to get the air from the air source to the Tires.. There's a pressure relief vent to Vent air from the tire.

7. CTIS’s Primary Functions A wheel valve is present which isolate the Tire from the system when it's not in use. An electronic control unit (ECU), the brain of the system is mounted behind the passenger seat. An operator control panel let customize tire pressure model. CTIS includes a speed sensor provide Information about current speed & in turn. CTIS maintain the optimum tire pressure. CTIS gives priority to the brakes since the Brakes & the tire share air from the same Compressor.

8. CTIS an inside look Parts- 1.A wheel valve 2 . Electronic control unit 3 . Pneumatic control unit 4 . Operator control panel 5 . Speed sensor 6 . Pressure switch

9. CTIS a closer look (At the Wheel)

10. A view of Central Tire Inflation System (CTIS) of a Tractor

11. Wheel Valve A wheel valve is located at each wheel end. Part of the wheel valve's job is to isolate the tire from the system when it's not in use in order to let the pressure off of the seal and extend its life. The wheel valve also enables on-demand inflation and deflation of the tires. Electronic Control Unit (ECU) An electronic control unit (ECU) mounted behind the passenger seat is the brain of the system. It processes driver commands, monitors all signals through out the system and tells the system to check tire pressures every 10 minutes.

12. The Pneumatic control Unit The ECU sends commands to the pneumatic control unit, which directly controls the wheel valves and air system. The pneumatic control unit also contains a sensor that transmits tire pressure readings to ECU. Operator control panel An operator control panel allows the driver to select tire-pressure modes to match current conditions. This dash-mounted panel displays current tire pressures, selected modes and system status. When the driver selects a tire-pressure setting, signals from the control panel travel to the electronic control unit and from there it goes to the pneumatic control unit and finally reaches the wheel valves.

13. Speed Sensor The CTIS includes a speed sensor that sends vehicle speed information to the electronic control unit. If the vehicle continues moving at a higher speed for a set period of times, the system automatically inflates the tires to an appropriate pressure for that speed. Pressure Switch This type of system uses air from the same compressor that supplies air to the brakes. A pressure switch makes sure the brake system gets priority, preventing the CTIS from taking air from the supply tank until the brake system is fully charged.

14. How It Works? The electronic control unit tells the pneumatic control unit to check current pressure and either inflate or deflate the tire to the pressure selected by the driver. If the system determines that inflation is needed, it first checks to make sure that brake pressure reserves are where they should be If they are, it applies a slight pressure to the wheel valve to allow inflation. If the tires are over inflated, the system applies a slight vacuum to the wheel valve. When the pneumatic control unit reads that the appropriate pressure is reached, the valve closes.

15. TMS (Tire Maintenance System)

16. AIRGO System The overall system is made up of a wheel-end assembly and a control module Parts- Air tank Pressure Protection Valve Shut-off valve Filter Control Box Air-supply line

17. Wheel End Assembly of AIRGO system The wheel-end assembly includes- A flexible hose with check valves. The check valves only allow air to flow into each tire and ensure that while one tire is being inflated, the other tires doesn’t lose air pressure. A stator (a non-rotating part) inside the axle spindle A flow-through tee that is attached to the hubcap. A deflector shield keeps contaminants such as dirt and water from entering the wheel end

18. Working of AIRGO system- When a tire loses pressure, due to a puncture or other seepage, a series of check valves automatically detects it. The System then immediately draws air from the vehicle’s pneumatic system and directs it to each tire requiring air. The air pressure is delivered via the trailer’s hollow axle housing. The air then goes through the hub assembly and into the tires. It is completely isolated from the brake system

19. Merits of Self Inflating Tire system- Longer tire life Reduced fuel consumption Protection against soil compaction Increased driving stability Enhanced productivity for field work Improved pulling performance Convenient push-button operation.

20. Demerits- Too many components. More costly than the conventional Tires. Requires more maintenance. Heavier than general vehicle. The user must have the basic knowledge about h ow to relate between the Pressure and the road condition.

21. Conclusion- Self inflating tires are going to be used in the bicycles, motorcycles along with the four or more wheelers through out the world and an era will definitely come soon when there will be only self inflating tires in practice.

22. Thank You

23. Queries ?