historic dramatic display of the "not-so-obvious" atmospheric-pressure pneumatic force potential
new (in development) state of the art indirect-pneumatic-coupling turbo compound engine capable of yielding "Otto intake cycle pumping-gain
to S.I. and C.I. Otto cycle engine by means of a promising robust adiabatic process that is both compatible and capable to further enhance the
specific fuel efficiency of, 'lagom-sized ' Otto cycle S.I. and C.I. engine using S.I. UAIC strategy (direct fuel injection system)
as well as reducing pumping-loss-friction of S.I. Otto cycle engine using the cost effective CAIC strategy (air throttled fuel systems fuel controlled for liquid fuels)
including all "air throttled fuel control system " for CNG & any gaseous state fuels including H2 ). +
The Light Turbo Compound engine variant uses lightweight, silent patented advantageous indirect pneumatic coupling
instead of using prior art direct mechanical or electrical coupling force.
Prior art turbo-compound engine recuperated much exhaust gas velocity's energy of the exhaust gas flow through a power recovery blow-down turbine geared to the engine crankshaft.
The energy coupling of recuperated exhaust gas energy was transmitted through efficient blow-down turbine coupled to a problematic gear reduced crankshaft,
or less efficiently more recently through a less effective pressure-turbine (using as normal turbocharger exhaust gas pressure and gas velocity) coupled to a
heavy electric generator and finally to an electric motor; with gear-reduction to assist the crankshaft.
Indirect-pneumatic-coupling pumping-gain from the LTCev conveniently uses strategically releases up to ~ ≥ 100 KPa of available sea-level atmospheric pressure pneumatic
force potential to exert a useful positive + pressure assistance ∆P onto piston crown face* during its cylinder's Otto intake cycle (that is dependent to engine load only at higher engine loads (for CAIC )
but even more can exert a higher useful positive + pressure assistance above any moderate engine loads (for UAIC ) onto same piston's crown face in the cylinder* during its Otto intake cycle
versus the under-pressure - easily generated in a contracting VVICC during its Otto intake cycle for (UAIC) as it is assisted by the lighter IFT's impeller's load requiring less exhaust energy from the IFT's
blow-down turbine to extract and transfer said evacuated contracting VVICC' s air into a closed-loop unequal volume transfer pumping system to another much larger expanding volume arrangement
of a cylinder strategically performing its Otto exhaust cycle since it only needs to marginally increase crankcase's pressure of cylinder's expanding VVICC while timely performing its exhaust cycle.
the synchronized expansion of said first said extracted VVICC's air pressure during Otto intake cyle is transfered into the expanding VVICC of another cylinder that is timely and strategically
performing its timely Otto exhaust cycle.
Indirect pneumatic coupling *turbo compound multi cylinder Otto cycle internal combustion engine uses an IFT (inverted-function-turbocharger) to create useful timely under-pressure extraction
pneumatic pulses generated by individually and successively evacuating the dry-sump’s VVICC’s air volume into the engine wet-sump/dry-sump crankcase (during said cylinder’s intake cycle)
while allowing to simultaneously expand evacuated-air into communicating supplemental engine enclosed volumes including the VVICC of a cylinder performing its exhaust cycle.
The timely synchronization of air evacuation* pulses synchronized with the engine firing order sequence generates unique advantageous indirect pneumatic-coupling pumping-gain assistance means that
further facilitate the Otto intake cycle pumping task capable to further variably improve the estimated specific fuel efficiency to approximately vary between 5 to 10% at engine part-load and and reduce by the
same pourcentage its CO2 emissions during medium to high engine operating load of prior art CAIC ( throttled) Otto cycle engine. (by reducing pumping-loss-friction )
Note: The fuel efficiency already provided by state of the art efficient UAIC (direct fuel injection) engine when operated
at higher engine loads range can be significantly be improved through optimization of the "Otto intake cycle air-pressures" ; a new possibility provided
when the technology of the Light Turbo Compound engine variant is used in conjunction it with UAIC (direct fuel injection) system; to provide
additional substantial improvements potential over direct fuel injection system's engine fuel efficiency by possibly up to 15 to 20%, can now realistically be envisioned
(with PCV system pending adapted updating) (reader note) ) ; furthermore enhancing AT-PZEV emission control such reduction in CO2 emission & fuel consumption
can be achieved withthout further increasing NOx missions : a patented unequal volume closed-loop system provides unique advantages needed for low pumping energy requirements.
IFT task ref. page 5
Dry-sum pref. fig 6 index page
Dry-sump ref. fig7 page 3 LTCev
|16-horse Magdeburg hemispheres
experiment (may 8, 1654)
|Otto Von Guericke
and the promising capability of
facilitating CAIC & UAIC Otto's gas exchange cycles by
|prior-art & down-sized CAIC
|during SHELOM MODE engine operation
|hic inceptant futura