Dual-fuel engine control method and system, and vehicle with control system

Abstract

The invention provides a dual-fuel engine control method and system, and a vehicle with the control system. The control method includes: acquiring the initial gasoline demand amount and the initial diesel oil demand amount according to a total demand amount torque, and determining the theoretical total air demand amount of a dual-fuel engine according to the initial gasoline demand amount and the initial diesel oil demand amount; monitoring the air inflow amount, and acquiring an excess air coefficient according to the actual air monitoring amount and the theoretical total air demand amount of the dual-fuel engine; acquiring a delay time coefficient, and acquiring a target excess air coefficient according to the delay time coefficient and the excess air coefficient; acquiring a gasoline amount compensation factor and a dynamic air amount compensation factor, and acquiring the gasoline compensation amount according to the gasoline amount compensation factor, the dynamic air amount compensation factor, and the initial gasoline demand amount; and adjusting the gasoline injection amount according to the gasoline compensation amount. The method can allow the dual-fuel engine to accurately acquire the fuel oil mixing ratio required by combustion, and thereby allowing the dual-fuel engine to possess excellent combustion and emission performance.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method and system for a dual-fuel engine and a vehicle with the system. Background technique [0002] Diesel engines have the advantages of good fuel economy and high reliability, and are used more and more in automobiles, but the particulates (PM) and nitrogen oxides (NOx) emitted by diesel engines are detrimental to urban air quality Impact. In order to meet the requirements of emission regulations and strictly control the generation of the above-mentioned emissions, a new generation of internal combustion engine combustion theory and combustion technology represented by homogeneous charge compression ignition (HCCI) and low temperature combustion (LTC) have been proposed. Thermal efficiency and significant in-cylinder purification characteristics have become research hotspots, among which dual-fuel technology is the most representative. By adjusting the ratio o...

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Problems solved by technology

From the perspective of the structure and control strategy of the two injectors, the structure and control complexity of the gasoline injector is relatively simple compared with the diesel injector, which makes it difficult for the fuel injection quantity of gasoline to meet the precision standard of diesel injection, especially It is most seriously affected by the intake air temperature, pressure fluctuation and airflow pulsation of the engine intake port; in addition, due to the lag in the transient response of the intake air volume, if it continues to inject according to the steady state oil volume, its combustion characteristics will inevitably change, resulting in worse emissions

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