Invent Design Develop Pty. Ltd.
THE ADAPTIVE AUTOIGNITION ENGINE (AAE).
AN AUTOMOTIVE ENGINE THAT WILL CUT GREENHOUSE GAS
BY UP TO 60%.
The AAE is an automotive engine that runs by an alternative mode of combustion, sometimes referred to as the "third generation engine mode". The AAE will reduce fuel consumption by 30% without intake boost and up to 60% with a 4 bar intake boost. Greenhouse gas (carbon dioxide) will be cut by the same percentage as the cut in fuel consumption.
At the start of 2005 the global car population was approximately 700 million cars. At that time new car production was in the order of 50 million cars per year. China and India will double these figures within the near future. Cars produce about a quarter of a tonne (1 tonne approximately equals 1.102 US tons) of carbon dioxide (CO2 ) for every 100 litres (26 US gallons) of fuel consumed. A car consuming 50 litres of fuel per week will produce about 1 tonne of CO2 every 2 months. Cars produced a significant proportion of the greenhouse gas inventory. The majority of the car population is powered by spark ignition (S.I.) engines. HCCI can displace S.I. and thus the AAE will have a major impact by reducing both fuel consumption and the production of automotive greenhouse gas. A 60% reduction in fuel consumption results in a 60% reduction in carbon dioxide. The reduction in fuel consumption and carbon dioxide will prevail for all of the car's working life.
The "third generation combustion mode" is called Homogeneous Charge Compression Ignition or HCCI . The first two generation engines are spark ignition (S.I.) and diesel engines. To date all attempts to develop HCCI engines have been limited by knock, cylinder pressure problems, timing and load problems. These problems have been solved in the AAE.
The essential advance of the AAE is the cylinder pressure control system.
Major car companies (Toyota, Honda, GM etc) are intensively investigating HCCI systems.
The AAE Cylinder Pressure Control System allows for maximum charge air/fuel combustion and allows for high intake air boosting. High intake air boosting can equal the benefits of HCCI. The potential reduction in fuel consumption by the AAE is about double what car companies expect out of HCCI .
The combination of HCCI and cylinder pressure control allows several benefits which are listed below.
During urban driving an unboosted (i.e. naturally aspirated) AAE will save up to 30% fuel.
During urban driving an inlet pressure boosted AAE (sustaining 4 bar) will save up to 60% fuel.
The percentage reduction in carbon dioxide production is the same as the cut in fuel consumption (i.e. a 60% cut in fuel will give a 60% cut in CO2 production). Carbon dioxide is a greenhouse gas.
An inlet pressure boosted AAE will have a reduced engine mass.
A car fitted with an AAE boosted to 4 bar will approach Hybrid Vehicle economy without the battery and electrics.
An AAE boosted to 4 bar will be more efficient than car diesel engines of similar power during urban driving.
prospect of retro-fitting existing engines to transform them into AAE s. No modification of the block or drive
The AAE may well be the only practical engine able to harness HCCI across the entire load range i.e. from idle through to stoichiometric fuel at maximum charge air (i.e. no EGR or charge air dilution other than residual gas) and the only practical HCCI engine able to sustain up to 4 bar inlet boost pressure at boost air mass stoichiometric fuel.