Low-temperature combustion and small-load stable combustion device and method for internal combustion engine

Abstract

The invention discloses a low-temperature combustion and small-load stable combustion method for an internal combustion engine. The method includes the following steps that in the running process of the engine, an electronic control unit reads temperature signals of a temperature sensor arranged on a gas inlet manifold; and when the gas inlet temperature of the engine is lower than the set temperature value of the electronic control unit, the electronic control unit sequentially sends control signals to a high-pressure waste gas recirculation bypass valve, a low-pressure waste gas recirculation bypass valve, an intercooler bypass valve and a gas storage tank valve till the set temperature is achieved. By means of the method, it is ensured that the gas inlet temperature can be efficiently and intelligently regulated.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to an internal combustion engine low-temperature combustion small-load stable combustion device and method. Background technique [0002] The theory of "Homogeneous Compression Ignition and Low Temperature Combustion" is considered to be the most potential alternative combustion technology for efficient and clean internal combustion engines, and thus has received more and more attention. However, the combustion process of this combustion method is mainly controlled by the kinetics of chemical reactions. Its ignition moment and combustion reaction rate are difficult to control; moreover, the operating conditions of this combustion mode are narrow, and the mixture is too lean or high-octane fuel is easy to "misfire" under low load and idle conditions, while under heavy load conditions In other cases, "knock combustion" is prone to occur (especially fuel with a high cetane n...

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Problems solved by technology

However, the hot exhaust gas introduced by this method requires complex variable valve technology, especially the variable valve mechanism based on diesel engines that requires a large driving force is more complicated, and there is no commercial application report yet.

On the other hand, for the traditional external EGR method, the exhaust gas is cooled and introduced into the intake pipe to control the high combustion reaction rate under the heavy load of "homogeneous compression ignition, low temperature combustion" or prolong the fuel-air mixing time, but its disadvantages Yes, the resulting final intake air temperature cannot be adjusted, which cannot well meet the requirements of stable combustion under small loads of the engine

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