The Linear Internal Combustion Engine (LICE), which is also called the Free-Piston Engine, was developed gradually from the 1920s.
Researchers at Sandia National Laboratories finished an investigation about a Free-Piston engine and analyzed the steady-state operating characteristics using a zero-dimensional, thermodynamic model with detailed chemical kinetics, and heat transfer, scavenging, and friction sub-models.
A comprehensive review of recent work of FPE can be found in Mikalsen and Roskilly's "A review of free-piston engine
history and applications," published in Applied Thermal Engineering (2).
An example of this is Sturman Industries' ADAPT system, which combines electronic fuel delivery, VVA air control, air-injection emission control, and a digital-hydraulic approach to a free-piston engine
The free-piston engine compressor has progressed through three distinct prototypes as shown in Fig.
Controlling the intake and exhaust timings of free-piston engines is challenging because the stroke is not kinematically constrained and the piston position is often difficult to measure.
The free-piston engine allows for variable compression, flexible combustion modes, and the use of different fuels, according to Haugen.
Besides flexibility, the free-piston engine offers other advantages over traditional engines in a hydraulic hybrid setting.
One promising alternative is a free-piston engine
, incorporating a linear alternator and using an unconventional combustion approach known as homogeneous charge compression ignition, or HCCI, in which fuel and air are premixed and compressed until the heat of compression makes them react.
CPG's baseline engine for this system is the free-piston engine
from Clever Fellow's Innovative Consortium of Troy, N.
In another key feature, the output of the free-piston engine
can be changed almost instantaneously.
Instead, they began to develop higher-powered free-piston engines