The revolutionary Libralato 6-phase Cycle

The Libralato SMART engine dispenses with the need for conventional cylinders, pistons, con-rods, crankshafts, valvetrains and camshafts. The SMART engine has only five moving parts: the two rotors, the shaft and the shaft mounted drive bars. All the bearings are close to the centre of the engine, away from the hot zones and easy to lubricate, with an oil circuit running through the shaft. Two inter-locking rotors (a power rotor and a following rotor) on different rotational axes, exchange gases between four dynamic chambers (intake, compression, combustion and expansion) without a throttle body and with low pumping losses.

At top dead centre, the dual rotor architecture switches instantly from compression to expansion with no loss of momentum, which allows exceptionally high compression and combustion pressures whilst avoiding the damaging effects of engine knock. The volume of the expansion chamber is 32% greater than that of the compression chamber. The power rotor directly converts the pressure of this over expansion to torque at the output shaft with much greater mechanical efficiency, over a much greater duration than a piston/connecting-rod/ crankshaft architecture. It is tuned for direct injection and internal EGR, with high and more consistent levels of torque, very low vibration and very low exhaust temperature and noise.

Libralato Cycle 360

The Libralato engine has a revolutionary new 6-phase cycle, with all 6 phases completed in each rotation of the engine. Compared to the SMART engine’s parallel 6 phase thermodynamic cycle, the sequential four stroke cycles of Otto and Diesel are archaic – from the Victorian era! .

The following diagrams illustrate the key points in the Libralato engine cycle.

Libralato Cycle 00 TDC image

Fig.1 - Libralato Cycle 00 TDC

Libralato Cycle 010 image

Fig.2 - Libralato Cycle 040

Libralato Cycle 030 image

Fig.3 - Libralato Cycle 085

Libralato Cycle 040 image

Fig.4 - Libralato Cycle 139

Libralato Cycle 085 image

Fig.5 - Libralato Cycle 162

Libralato Cycle 139 image

Fig.6 - Libralato Cycle 186

Libralato Cycle 163 image

Fig.7 - Libralato Cycle 228

Libralato Cycle 184 image

Fig.8 - Libralato Cycle 255

Libralato Cycle 210 image

Fig.9 - Libralato Cycle 290

Libralato Cycle 222 image

Fig.10 - Libralato Cycle 335

The graph below illustrates the Libralato cycle chamber volumes across 360o of rotation. The red line describes the expansion volume on the left side. The blue line describes the compression volume on the right side. The green line indicates the intake volume in the centre.

Libralato cycle volumes with valve timings

The graphs below show comparisons between the Libralato cycle and the Otto and Diesel cycles. The Libralato SMART engine is an historic breakthrough in engine design, capable of >50% brake efficiency; Euro 6/7 emissions compliant; <4kW/kg; <250kW/L; <$15/kW manufacturing cost. Libralato won the 2017 Frost & Sullivan award for Visionary Innovation Leadership for the Powertrain Industry Europe!

Libralato cycle volumes with valve timings

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