Double-fuel machine control system and double-fuel machine control method igniting natural gas due to micro-injection of diesel oil

Abstract

The invention discloses a double-fuel machine control system and a double-fuel machine control method igniting natural gas due to micro-injection of diesel oil. The double-fuel machine control system comprises a monitoring cabinet, a unit pump control unit, a natural gas control unit and a sensor group, wherein under a pure diesel oil mode and a double-fuel mode, an electronic unit pump controls an injection mass and injection timing of the diesel oil; under the double-fuel mode, the natural gas control unit controls opening and closing of a gas valve in an intake manifold of each cylinder of the engine to control the amount of the natural gas; switchover from the pure diesel oil mode to the double-fuel mode is realized through adopting a stepped oil drop method; switchover from the double-fuel mode to the pure diesel oil mode is realized through adopting a stepped gas drop method; the non-uniformity of the exhaust temperature of each cylinder is controlled through adopting an exhaust temperature correction algorithm; and the ignition timing in each working condition is controlled through adopting an MAP table lookup method. The double-fuel machine control system and the double-fuel machine control method, which are disclosed by the invention, can achieve high combustion efficiency and good emission indexes.

Description

technical field [0001] The invention belongs to control and engine technology, in particular to a control system and method for a diesel micro-injection ignited natural gas dual-fuel engine. Background technique [0002] In diesel and natural gas dual-fuel diesel engines, natural gas is used as the main fuel in addition to diesel, thereby achieving green emissions and fuel cost reduction. At present, there are many ways to realize the fuel control of the dual-fuel high-power diesel engine system, but there are the following disadvantages in practical application: [0003] (1) There is a risk of unburned natural gas leakage when starting a diesel engine in dual-fuel mode; [0004] (2) During the switching process, the speed fluctuation rate is relatively large; [0005] (3) It is easy to blow gas between the cylinders, and the response speed is slow; [0006] (4) It is difficult to achieve a higher replacement rate. [0007] Therefore, it is necessary to develop a new con...

AI Technical Summary

Problems solved by technology

[0003] (1) There is a risk of unburned natural gas leakage when starting a diesel engine in dual-fuel mode;

[0004] (2) During the switching process, the speed fluctuation rate is relatively large;

[0005] (3) It is easy to blow gas between the cylinders, and the response speed is slow;

[0006] (4) It is difficult to achieve a high replacement rate

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