Diesel/natural gas active blending combustion electronic control system and method

Abstract

The invention discloses a diesel / natural gas active blending combustion electronic control system and method. The electronic control system comprises a single-chip microprocessor, a natural gas nozzle intelligent drive circuit, a diesel nozzle drive circuit, a pure diesel mode / active blending combustion mode diverter switch, a load signal processing circuit and a self-adapting processing circuit, wherein the natural gas nozzle intelligent drive circuit, the diesel nozzle drive circuit, the pure diesel mode / active blending combustion mode diverter switch, the load signal processing circuit and the self-adapting processing circuit are respectively connected with the single-chip microprocessor. The load signal processing circuit receives a detection signal of an engine load sensor. The self-adapting processing circuit receives a detection signal of a crankshaft position sensor. The crankshaft position sensor measures the rotating position and the rotating speed of an engine crankshaft. The electronic control system is connected with an original diesel engine electronic control system in parallel and does not depend on the original diesel engine electronic control system, and therefore the optimal control over fuel-injection quantity, gas-injection quantity and fuel injection timing for blending combustion is achieved; besides, the detonation phenomenon which may occur in the passive blending combustion process of dual fuel is avoided fundamentally, and the reliability of long-term work of a dual-fuel engine is guaranteed.

Description

technical field [0001] The invention relates to the field of engine electronic control, in particular to a diesel / natural gas active blending electronic control system and method. Background technique [0002] Under the premise of not making any changes to the engine mechanical part of the high-pressure common rail diesel engine, adding a natural gas supply device to the engine (generally using the gas supply from the engine's out-of-cylinder intake port) can realize the combustion of natural gas in the diesel engine. Since the two fuels are burned at the same time, it is called mixed combustion to distinguish single-fuel combustion. This dual-fuel blending combustion has two major advantages: (1) The diesel engine and the original high-pressure common rail diesel electronic control system remain unchanged, which not only meets the requirements of Chinese regulations, but also continues to enjoy the original after-sales three-guarantee service. (2) Economic benefits of savi...

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Problems solved by technology

[0004] In order to overcome the defect that the existing dual-fuel system completely relies on the original ECU and cannot actively control diesel injection, the present invention provides an electronic control system and method for active blending of diesel oil / natural gas, which not only controls the amount of diesel injection for ignition, but also controls the amount of ignition Diesel injection timing

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