Concept Engine Exhaust Hybrid 
Green Car Congress
OCTOBER 31, 2009
The wave disc engine, a new implementation of wave rotor technology, was earlier developed by the Michigan State group in collaboration with researchers from the Warsaw Institute of Technology. The WDG also can reduce carbon dioxide emissions by as much as 95 percent in comparison to modern internal combustion vehicle engines.
Green Car Congress
JUNE 6, 2012
A researcher at the Nanjing University of Science & Technology is proposing a novel opposed-piston free-piston linear generator for use in series hybrid electric vehicles. Secondly, the central combustion chamber is benefit for highly efficient scavenging via intake and exhaust ports without using valves. Click to enlarge.
Green Car Congress
MAY 23, 2009
Schematic of downsized and supercharged four-stroke hybrid pneumatic spark injection engine. The injection of the additional air during transients can overcome the poor driveability usually associated with heavily downsized and supercharged engines, the team notes. The engine has two intake and two exhaust valves per cylinder.
Green Car Congress
MAY 9, 2013
Heat hybrid. A cryogenic engine such as the Dearman engine could also be used as a heat hybrid in combination with an internal combustion engine or hydrogen fuel cell to convert waste heat into additional shaft power at high levels of efficiency, reducing both fuel consumption and emissions. The Dearman engine.
Green Car Congress
DECEMBER 30, 2015
Researchers at the Dalian University of Technology have proposed a novel method to control premixed charge compression ignition (PCCI) phasing in internal combustion engines in all load operations. It compresses the pressurized gas produced by exhaust gas turbocharger, comprising fresh air and exhaust gas introduced from the EGR valve.
Green Car Congress
OCTOBER 18, 2012
Isuzu D201 35 hp diesel engine (left) and the LiquidPiston 40 hp X2 Prototype (right). Other features of the X2 include: Quiet operation: engine lacks poppet valves and over-expansion minimizes exhaust noise. Liquid Piston is married to the High Efficiency Hybrid Cycle—e.g. Click to enlarge. LiquidPiston, Inc.
Green Car Congress
OCTOBER 29, 2019
An adaption of cylinder de-activation technique called ECONAMIQ over-expansion can be applied to engines to improve fuel efficiency. Using the pressure from the exhaust gas from the active cylinders, the ‘idle’ cylinders could be expanded to extract more work out of the engine during partial load operation.
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