In developing countries, the recent rise in the operating cost of gasoline passenger cars has forced vehicle/fleet owners to opt for alternative gaseous fuels like CNG LPG ECU. Due to the non-availability of efficient gaseous systems from OEMs, many retro' or after-market kits are being used by the vehicle owners to take the advantage of the low kit cost. These after-market systems pose major issues related to engine warranty, safety, emission compliance, performance, driveability and adverse effect on the mainstream gasoline engine.
Here we introduce the development of the LPG MPI engine. The objective of the project is to develop a bi-fuel LPG variant of the already existing gasoline engine without compromising on performance, driveability, safety and emissions with minimum cost impact. Precise control of LPG operation necessary to meet the engineering targets is achieved by the use of EMS in master-slave architecture.
The architecture uses two ECUs wherein the Gasoline (master) ECU and LPG (Slave) ECU works in tandem thereby eliminating sensor duplication and providing cost advantage. The system is completely diagnosable with the automatic transition to gasoline in case of LPG system failure or an empty tank.
The vehicle meets the Bharath Stage 3 norms (equivalent to Euro 3) with sufficient margin in both gasoline and LPG mode. The max power drop in LPG is 4% which is close to the theoretical value. There is no deterioration in the low end and max torque with LPG.
Driveability and acceleration performance with LPG is at par with gasoline. Durability aspects specific to the operation have been addressed by a modification to the engine hardware. Compared to gasoline, the CO2, CO and HC emissions are lower by 11%, 15%, and 39% respectively. In short, this MPI LPG system offers the best of both fuels without major cost escalation and complies with the required legal safety norms.
Jiaxing Lineng Autogas Equipment Co., Ltd. is a professional manufacturer and supplier of CNG Regulator, please feel free to contact us if you need it.