Things You Can Run With Hit and Miss Engine
Throttle Governed - Controls the engine speed past controlling a butterfly in the carb. If it runs also slow, information technology opens the butterfly and a larger accuse of air and fuel is allowed into the engine and information technology runs faster. If the engine runs too fast, it closes the butterfly and allows a smaller accuse of air and fuel into the engine and it runs slower.
Both types of engines take ane matter in mutual the govenor. So we volition beginning with that.
The Govenor
Beneath in Fig. 1 is an animation of a typical govenor in action. As the engine speed increases, the weights on the govenor wing outward because of centrifugal force. This action in turn pushes the rod in the middle outward. Every bit the engine slows they are forced inwards by a fix of springs (springs non shown).
Fig. 1
You lot can now use this action of the rod moving outward (going too fast) and inward (slowing down) to control the engine. The oldest of the two types of engines is the "Hit and Miss" only nosotros will starting time with the easiest to explicate starting time or the "throttled goverened" engine.
Throttle Governed Engine
Below in Fig. 2, y'all will meet a govenor hooked onto a mixer or normally known as a carburetor. As the engine increases in speed, the butterfly in the mixer is airtight thereby reducing the amount of fuel the engine gets. Less fuel, the slower the engine runs at. if the speed becomes too low, the govenor moves the butterfly more open which increases the amount of fuel and the engine speeds upwardly.
Fig. two
The "Striking and Miss" Engine
The older of the two types is the Hitting and Miss gas engine. It is too less regulated than the throttle type. At that place are two unlike states the engine tin can exist in, "Hitting" or "Miss".
Offset we will expect at the "Hit" country. This is really the aforementioned as the throttled engine except each time the engine intakes the gas it takes a full charge. There is no butterfly in a hitting and miss mixer. And so the engine wants to go faster and faster.
We volition discuss how to "slow" the engine down or regulate it in the "Miss" section coming up.
Here are the Four cycles (4 strokes) of the "Striking" state.
Refer to fig.3 below. This is the intake cycle where the piston is moving to the right or away from the head. Equally it does, it creates a vacuum in the cylinder and that pulls the air and fuel into the cylinder. The intake valve is not shown here, and is just on a spring to keep information technology in the closed position. As the vacuum increases it pulls the intake valve open up and the air/fuel mix enters.
Intake Bicycle
Fig. three
Notice the contacts that are hooked to a "buzz" coil to create the spark later. Besides the rod from the govenor is down because the engine is running slow . See Fig. 9 beneath for a view of how the rod and govenor works on this setup. As for now, the govenor is not in play .
Refer to fig.four below. This is the pinch cycle. All valves close and the piston moves to the left or towards the head. As it does, the mixture compresses making it very volatile.
Pinch Cycle
Fig. iv
Fig. 5 below shows the the contacts to the "buzz" coil closed and that fires the spark plug pushing the piston to the right or away from the head. Notice in the fire bicycle, the cam allows the frazzle rod to dip backwards, allowing the contacts to shut and fire the spark plug.
Burn Wheel
Fig. 5
Fig. 6 below shows the exhaust valve opening and the piston pushing out the exhaust
Exhaust Cycle
Fig. vi
As the piston reaches the to, the engine starts the cycles all over kickoff at the intake cycle (Fig.3) above.
In Fig. 7 below you will see the entire performance animated. Detect in the fire cycle, the cam allows the exhaust rod to dip backwards, allowing the contacts to close and fire the spark plug.
Anamated Four Cycles ("Hit" State)
Fig. 7
And then how do nosotros "govern" the engine?
Govenor in locked posision ("Miss" State)
Fig. 8
Refer to Fig. eight in a higher place and Fig. ix beneath. As the govenor runs too fast information technology pushes the govenor rod into the exhaust push rod and traps it (encounter Fig. nine below). This allows the frazzle valve to stay open all the time. No vacuume is made by the piston and so no fuel can enter into the cylinder. Also the contact going to the "buzz" coil will not close, and then the spark plug never fires. The engine just "free wheels" or coasts. Finally is slows too much and the govenor removes it's rod and the entire engine returns to the "Hit" state.
Fig. ix
Below in Fig. 10 you will meet 2 four stroke cycle in the "Striking" state then two four stroke cycles in the "Miss" state.
Here is a hint every bit to which land it is in. If the exhaust valve isn't moving at all, it'southward because information technology is in the "Miss" country or slowing downwards.
Animated Two "Hitting" Cycles and Ii "Miss" Cycles
Fig. 10
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