P13263: Hybrid Engine Test Stand/public/
How a 2 Stroke Engine Works
How a 4 Stroke Engine Works
- Video 1
- This may be obvious but this video offers a great visual for the internal workings of a 4 stroke IC engine.
- A Kohler CH5 Engine is available for use. This engine was taken apart on September 27, 2012.
How a 6 Stroke Engine Works
- 3 compression and 3 expansion phases
- Traditional 4 strokes combusting gasoline plus two extra stokes used to capture the waste heat by injecting water
- Water vaporizes driving the cylinder down for the 6th stroke
- Rather than exhaust combustion products during the 4th stroke, keep exhaust valve closed and inject water into the re-compressed hot gases
- The following animation injects and compresses fresh air rather than injecting water to capture the waste heat, but still show the basic operation
How an 8 Stoke Engine Would Work
- Two 4 stroke cycles, one after the other
- Traditional 4 stroke gasoline followed by...
- Another 4 stroke cycle used to vaporize water instead of combusting gasoline using regenerated exhaust gases or fresh air to capture waste heat
Measuring Fuel Consumption
- In order to measure fuel consumption, the start and end point on a 1000mL graduated cylinder will be observed.
- Polymethylpentene (TPX) is the material that plastic
graduated cylinders are made from. TPX shows acceptable
resistance to gasoline as long as the gasoline is not
held for long periods (over 7 days) of time.
- Reference website:http://www.tedpella.com/company_html/chem-resistance.htm
Measuring Crank Position
- Crank Position Sensor - Typically, engines use a hall-effect sensor, an inductive sensor, or a optical sensor to measure crank position.
- Dynamometers may use a DC generator or a water brake system to measure power.
- Direct Injection Systems - This is a standard automotive direct injection system.
- NI DAQ - $170, 8 analog inputs 10kPa, 2 analog outputs, 12 digital I/O
Torque Sensors - Torque can accurately be measured
by coupling the engine and the load together with the
torque transducer between them.
- This project requires at least the Vibrac TQ1600 Series. (~11.4 N•m)
to choose the best torque sensor
- We want a rotary torque sensor
- If possible, one with built in position encoding would be ideal
- At peak power (5hp @ 3800RPM), the engine
produces 6.91 lb-ft of torque (82.93 lb-in, 9.38 N-m)
- Would want to double that as a rule of thumb, the DC motor can handle up to 10HP. At the same engine speed, that torque = 13 lb-ft, 170 lb-in, 17.63 N-m)
Throttle Servo Control
- Solenoid Choke Actuator (Video)
- Servo Throttle Actuator (Spec Sheet)
- (Eight 6-32 x 3/8" machine screws and nuts included.)
"Test" test stand
- Needed to benchmark engine for temperature readings and vibration issues
- Built from a donated wooden packaging crate
- Gas tank uses a gravity feed to supply fuel to engine
- Volume measurements on side of gas tank, used to find fuel consumption/economy
- Possibility to use as part of final test stand
- Pros - Wood provides good natural vibration dampening; already built and works; we are running short on time; good base to use for the rest of test stand; this is a proof of concept, so it doesn't need to be pretty
- Cons - Wood is flammable while an all metal stand wouldn't catch flame as easily; need to design rest of stand around the wood base (could be a + as well); wood isn't all that attractive
Concept Development (generation, improvement, selection)
|Building Materials (Wood, Metal)||Donation||Wood-yes|
|Fuel and Water Tanks||Donation||Fuel - Yes|
|Laptop with LabView||Use existing||Yes|
Systems Design Review
- Detailed in Meeting Minutes