Table of Contents
MSD I Wrap Up Items
Phase 5 Review Action Items
- How are we going to ensure a leak free seal between the rotating disk and output port? – full wear down machining vs. starting with CNC then using wear down machining (needs to be a process that can be used in mass production)
- Look into the actual material that the current prototype uses for its output port.
- Calculate a top level error for the proposed test setup by propagating the errors through the mass flow rate equation.
- Sort the risk assessment list by importance to more easily see the major risks.
- Look into if a non-constant input pressure will cause any issues, as brought up by Lazlo.
- Change resistors to a smaller size that we have the ability to solder.
- Check microcontroller impedance. Is it too high or too low?
- Does the auto-zero test span the entire range? Is it only necessary to perform it once?
- Specify the size and material for the proposed test setup’s output tube.
- Can the H-bridge handle the correct amount of current we will be using?
- Call CTS instead of emailing them to hopefully get quote information.
- Use 0 ohm resistors throughout the PCB to aid in debugging.
- Talk to Dr. Press about project specific applications to get material for Imagine RIT.
Imagine RIT Shared Vision
Best Case Scenario
We have a fully functioning Prototype completed before Imagine RIT. There are two main concepts to illustrate at our booth. The first is our ability to control flow rate. This will be done by having our device hooked up to a flow meter and is controlled via programmed PWM’s. An alternative would be to set up a game in which the spectator steps on a pedal to go through a range of mass flow rates to demonstrate how the prototype would work in a car. The second concept is the ability of our distribution plate to efficiently mix air and fuel. This will be done by flowing water through the distribution plate to show the swirling effect since air/smoke would be difficult to see. We would also have a poster breaking up major design components through MSD. We would also explain what the benefits of this system would be, and its conception in the first place using natural gas and gasoline in a bi-fuel powered vehicle.
Moderate Case Scenario
We have either a partially working prototype or cannot obtain equipment needed to do live demonstration of the flow rate. In this case we would use CAD models and videos of the device being tested to convey are message. We may still be able to do the live demonstration of the fuel mixing process, assuming we can obtain access to a water source. We will still explain the benefits of the system, and its conception using natural gas and gasoline in a bi-fuel powered vehicle.
Worst Case Scenario
We do not have a working prototype that is even partially capable of a demonstration of flow control. From this, we would use CAD, Posters, and modelling to portray what we should expect when the prototype is functioning. We would focus on identifying problems, how to correct or avoid them, and what needs to be completed in the next phase of the project. We will still explain the benefits of the system, and its conception using natural gas and gasoline in a bi-fuel powered vehicle.
The most up to date version of the Imagine RIT Shared Vision can be found here.
End Shared Vision
In addition to the deliverables expected by Imagine RIT, we would also like to complete the following by the end of MSD II:
- Complete drawing package for production unit Gaseous Mass Flow Rate Controller (GMFRC) with all electronics integrated into the housing
- An updated BOM that covers the production unit
- Documentation of entire design process
- Test data supporting our claims
- PCB layout of electronics for a production unit
- User's operation guide
- Technical paper on our GMFRC prototype
MSD II Wrap Up Items
Phase 6 Shared Vision
If there was another phase, the main goal of the phase would be to try to satisfy any of the engineering requirements that were not met. Some may be able to be met within an additional phase, while others would need significant design changes and need to be tackled by another MSD team in the future. Therefore, detailed technical plans for these design changes would be made.
- Electrical Vision:
- Optimize the control algorithm to improve the settling and response time of the actuator
- Test performance with PI and PID control algorithms
- Integrate Pressure and Temperature sensors into the code
- Identify issue with lower accuracy at higher (~45-55 degrees) positions
- Start designing and finding components to reduce the PCB size and cost
- Mechanical Vision:
- Acquire the EDM’d rotating disk from NTID to test whether or not the dynamic range is significantly increased or not.
- Acquire a mass flow rate meter, not a volumetric flow meter, in order to measure the actual mass flow rate coming out of the device.
- Help the EEs correct/calibrate the MFR equations/calculations in the code so that the device is accurately dependent on the input temperature and pressure.
- Continue designing the cam and ball valve design.
- Start redesigning the distribution plate for a specific engine and mass production so that further testing can be done.
- Work with the EEs to integrate all of the electronics, including the PCB, temperature sensor and pressure sensor, into the production housing.