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2014•Journal of Chongqing University. English EditionRequires access

Development of control system for a CNG/gasoline bi-fuel engine

GE Xiaochen

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Abstract

The CNG/gasoline bi-fuel vehicle using CNG as the primary fuel and gasoline as a secondary has good economy and emission performance,but the traditional bi-fuel engine uses master/slave dual ECU system cannot realize it.For improving the performance,the research with multi-point sequential injection based on single ECU which is designed for OEM is made.The CNG special control strategies are designed such as Lambda PI control logic of Non-symmetric oscillation,and also the experimental investigation for this bi-fuel engine and the emission test of vehicle are carried out.According to the experiment results,the performance of engine with single ECU is better than the engine with master/slave dual ECU,and the value of emission is less than euro IV emission levels when we use CNG fuel.

About this research paper

What this paper is about

The CNG/gasoline bi-fuel vehicle using CNG as the primary fuel and gasoline as a secondary has good economy and emission performance,but the traditional bi-fuel engine uses master/slave dual ECU system cannot realize it.For improving the performance,the research with multi-point sequential injection based on single ECU which is designed for OEM is made.The CNG special control strategies are designed such as Lambda PI control logic of Non-symmetric oscillation,and also the experimental investigation for this bi-fuel engine and the emission test of vehicle are carried out.According to the experiment results,the performance of engine with single ECU is better than the engine with master/slave dual ECU,and the value of emission is less than euro IV emission levels when we use CNG fuel.

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Available abstract

The CNG/gasoline bi-fuel vehicle using CNG as the primary fuel and gasoline as a secondary has good economy and emission performance,but the traditional bi-fuel engine uses master/slave dual ECU system cannot realize it.For improving the performance,the research with multi-point sequential injection based on single ECU which is designed for OEM is made.The CNG special control strategies are designed such as Lambda PI control logic of Non-symmetric oscillation,and also the experimental investigation for this bi-fuel engine and the emission test of vehicle are carried out.According to the experiment results,the performance of engine with single ECU is better than the engine with master/slave dual ECU,and the value of emission is less than euro IV emission levels when we use CNG fuel.

Key concepts: Automotive engineering, Gasoline, Petrol engine, Fuel injection, Engineering, Octane rating, Compressed natural gas, Original equipment manufacturer

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