We
know that the gas mixture in the combustion of a lot of heat, and
pressure increased significantly. Then the gas in the piston is all
useful work output from the engine crankshaft (ie, success) of the duty
cycle, The answer is no. This is because the Electric Motor intake and
exhaust, burning time, moving parts (piston ring and cylinder wall
friction mainly), lubricant viscosity, friction, etc., must consume some
power.
Not
all of the internal combustion engine heat into useful work, and only a
small part in promoting the piston-driven approach to the open
atmosphere to the crankshaft rotation, part of the exhaust heat, this
energy loss as part of the exhaust losses, the exhaust loss% the total
energy of about 40. Intake and exhaust loss is generally believed that
the so-called pumping loss textbooks. Typically, when the piston reaches
bottom dead center before the exhaust valve must be opened in advance,
if you do not advance the exhaust valve opens, the cylinder gas pressure
can still push the piston down. Early exhaust valve opening, so that
the Orbit hydraulic motor lost some energy, this part of the losses and
pumping losses, known as the ventilation losses.
Fuel
combustion heat from the engine cooling system as part of the heat for
acting only a small part of the emissions part. Therefore, low thermal
efficiency of internal combustion engines, four-stroke gasoline engines
are generally 20% to 25%, and even high-performance engine, the thermal
efficiency is 30%. In other words, useful energy generated by fuel
combustion, less than 1 / 3 be used effectively, there are more than 2 /
3 of the heat exactly where to go? To clarify this issue, we need to
look at a variety of engine power loss.