Diesel oil and natural gas dual-fuel engine electronic control unit supporting multi-point injection of natural gas

Abstract

The invention relates to a diesel oil and natural gas dual-fuel engine electronic control unit supporting the multi-point injection of natural gas. The diesel oil and natural gas dual-fuel engine electronic control unit comprises a microprocessor and peripheral circuits, and further comprises a power management module, a crankshaft and camshaft position signal acquisition module, an exhaust temperature signal acquisition module, an analog signal acquisition module, an electromagnetic valve driving module, a low-edge driving module, a current detection module and a communication module which are connected with an electronic control unit. Compared with the prior art, the diesel oil and natural gas dual-fuel engine electronic control unit provided by the invention has the advantages that a diesel oil injection electromagnetic valve and a natural gas injection electromagnetic valve can be independently controlled without additionally mounting other signal transponders and equipment; meanwhile, a conventional electromagnetic valve driving circuit is improve and a high-voltage driving power source is added, so that the electromagnetic valve opening time can be shortened, the power consumption can be lowered, and the more accurate injection can be achieved; and pilot diesel and natural gas can be regularly supplied to each air cylinder by adopting a multi-point sequential injection method, thereby effectively improving the working performance of a natural gas / diesel oil dual-fuel engine.

Description

technical field [0001] The invention relates to an electronic control unit of a diesel and natural gas dual-fuel engine supporting multi-point injection of natural gas. Background technique [0002] Natural gas / diesel dual-fuel engines are currently mostly modified from original diesel engines. On the basis of retaining the original vehicle electronic control unit, a set of natural gas injection control unit is added, including adding an electronic control unit and sensor signal transponder. On the one hand, most of the modification schemes currently in use use the single-point injection method of natural gas in the engine intake manifold, which cannot accurately control the injection time, and the combustion control is not good; on the other hand, the natural gas electronic control unit used for modification has problems that cannot directly collect Vehicle signal, using the traditional solenoid valve drive method and poor control accuracy, etc., resulting in the modificat...

AI Technical Summary

Problems solved by technology

On the one hand, most of the modification schemes currently in use use the single-point injection method of natural gas in the engine intake manifold, which cannot accurately control the injection time, and the combustion control is not good; on the other hand, the natural gas electronic control unit used for modification has problems that cannot directly collect Vehicle signal, using the traditional solenoid valve drive method and poor control accuracy, etc., resulting in the modification effect often not meeting expectations, and the addition of an electronic control unit also increases the overall complexity of the electronic control unit, which is not conducive to the development of diesel engine oil to gas technology Therefore, it is imperative to improve and innovate the electronic control unit for diesel-natural gas dual-fuel engines that support natural gas multi-point injection

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