The combustion engine is the state of the art drive train for many applications either for mobile use or in areas with a less developed electrical grid. Combustion engines boast a high power density, robustness and low manufacturing costs.



The combustion engine has been introduced into a wide market with different targets. Due to the global use of combustion engines as a drive train for many applications, beginning with road traffic purposes (cars, trucks and motorcycles) down to drive trains for agriculture, industrial, handheld working tools and, of course, boats, the European Commission has specified the exhaust gas emissions of combustion engines for mobile applications. With this, legislation emission standards for all new engines, sold in the EU, are now established.

All experts have agreed that, alongside the emission legislation for road traffic, the emission standards for other applications are likely to become more stringent, in the near future. Looking at this scenario, VEMAC has developed a piezoelectric controlled carburettor (PCC) for petrol combustion engines, which is adaptable for use on both two stroke and four stroke engines.

Tests  carried out on a 4-stroke engine show very good results, regarding both emission reduction and fuel efficiency. It was shown that raw emissions could be reduced, dramatically, (CO > 90% and HC 60%). At the same time the fuel efficiency could be increased by 15%.

The additional advantage of the “piezo carburettor” is the control of the fuel air ratio without any influence on the engine load. The VEMAC “piezo carburettor” technology allows further on the lubrication of the engine by fuel oil mixture. Due to the very low electric power consumption and the low system weight the system is predestined for combustion engine driven handheld tools, small motorcycles and outboard motors.

The results of the investigations show that the piezo module operates excellently. Some work has to be done to miniaturise the electronics and enlarge the robustness of the oxygen sensor. This optimisation can be easily achieved if a development process, with a target application, is initiated alongside an engine manufacturer.

The client application is also needed to define the electric energy source, the electronic circuit design, the wiring harness, the electric connectors and the complete package. Further ideas to substitute the oxygen sensor with other sensor signals and new control algorithm have to be examined.

In a project with a higher level of industrialisation the potential for miniaturisation of the piezo module will be utilised. Also the simplification of the carburettor design will be used.

The demonstration shows excellent performance due to the enhancement of a well known and established  technology, lowest electric power consumption, best robustness and lower system complexity.

The “Piezo Carburettor” technology could present a powerful, cost effective and intelligent alternative to fuel  injection systems.