URBAN BUS PROPELLED BY LPG/AUTOGAS ENGINE

The increasing importance of the energy and environmental aspects associated with any activity has caused a great need as well as a growing interest in diversification and energy saving. With this objective, the search for and use of new initiatives based on clean alternative energies (electricity, hydrogen, biofuels, LPG and natural gas) has been encouraged.

In the case of the transport sector, thanks to these initiatives, there is an increase in the number of vehicles powered by LPG (bifuel with gasoline), although there is still a need to eliminate certain technological barriers to achieve their full development and be much more competitive and attractive for both fleets and individuals:

  • Calibración no óptima: La falta de sistemas de calibración adecuados, provocan un consumo de GLP elevado, daños mecánicos de partes del motor, avisos de avería por inyección pobre y ralentí inestable, minimizando las ventajas de una mayor autonomía y menores consumos que proporciona el uso del GLP.
  • Not optimal calibration: The lack of adequate calibration systems cause a high consumption of LPG, mechanical damage to engine parts, fault warnings due to poor injection and unstable idling, minimizing the advantages of greater autonomy and lower consumption that the use of LPG provides.
  • Need for specific additives to protect the valves: LPG increases the temperature of the combustion chamber at high revolutions and it is necessary to use additives to reduce it and avoid the dreaded drying of the valves, which causes their failure over time.
  • Injection mismatches: The current systems, not being specific to LPG, have excess air due to mismatches in the injection, causing an increase in the combustion temperature, with the complications derived from it (drying of valves, etc.). Additionally, the control units of current vehicles do not have the appropriate technology to detect the fault, but instead store a code that will be discovered in a routine review when connected to the diagnostic machine. Predictive maintenance does not yet exist.

It is for all the above, that the promotion of alternative energy such as LPG, needs R&D developments, such as the one proposed, aimed at improving the current state of the art, in terms of calibration, systems injection and optimized mixtures to reduce the need for additives.

 

General objective of the project.

The main goal of the project is the definition, design, development, validation and homologation of a prototype of urban bus based on a 100% efficient propulsion system with an optimized injection method (liquid in injection) as well as with a predictive maintenance program.
This design will result in the first prototype of an urban bus powered 100% with LPG in an efficient way, homologated for the European regulation of emission control Euro 6.

The scope of the project will cover the innovations of the calibration, injection, fuel and lubricant systems, as well as the management of their maintenance that increase the efficiency and reliability of this type of vehicle propulsion. The general objective is the development of the calibrations of the injection and ignition systems, with the use of improved mixtures and lubricants for the integrated engine, ensuring that the performance of the engine is the highest possible, complying with the technical requirements derived from anti-pollution regulations.

Related news

http://www.expansion.com/empresas/energia/2017/03/26/58d793c2ca474161528b45c0.html
http://www.20minutos.es/noticia/2995415/0/repsol-upv-participan-desarrollo-primer-autobus-impulsado-100-por-autogas/
http://www.eldiario.es/economia/Repsol-participa-desarrollo-autobus-licuado_0_626437552.html
https://okdiario.com/economia/empresas/2017/03/26/repsol-fabrica-primer-autobus-europa-impulsado-gas-licuado-petroleo-glp-858883