A Retrofitted Dual-fuel Engine Injection Timing Control Method

Abstract

The invention relates to a device and method for controlling gas injection moments of a modified dual-fuel engine. The device is characterized in that a pressure sensor is installed on one of fuel delivery pipes of a fuel injection pump of the engine and connected to an electronic control unit through a signal line. The method includes the steps that pressure fluctuation signals generated during fuel injection of the engine are detected through the pressure sensor installed on one of the fuel delivery pipes of the fuel injection pump of the engine, and transmitted to an electronic control unit through the signal line, the electronic control unit judges the fuel supplying moments of air cylinders according to the pressure fluctuation signals, and the natural gas injection moments and the injection continuing time of the air cylinders of the engine are controlled based on the fuel supplying moments. The device and method are accurate in control, modification can be easily implemented, modification of the engine is small, and the modification cost is low.

Description

technical field [0001] The invention belongs to the technical field of refitting a dual-fuel engine, in particular to a jet timing control device and a control method for refitting a dual-fuel engine. Background technique [0002] When retrofitting a mechanical pump diesel engine with diesel-natural gas dual fuel, the single-point air supply method of the intake pipe will cause little damage to the original engine structure change. In the initial stage of the engine dual fuel conversion market, users are often more willing to accept it. However, due to the lack of timing control of natural gas supply, the single-point gas supply method often has the risk of air leakage and intake pipe backfire when valves overlap. [0003] In the prior art, in order to control the injection timing of natural gas in each cylinder, the fuel injection timing of each cylinder is obtained as a basis, and the natural gas injection timing of each cylinder is controlled based on this. For the mecha...

AI Technical Summary

Problems solved by technology

This method needs to install a phase position sensor on the crankshaft or camshaft. When refitting the diesel-natural gas dual fuel of the vehicle in use, it is often very inconvenient to install the sensor on the crankshaft or camshaft. Sometimes it is necessary to adjust the ring gear of the flywheel. It is difficult to modify the missing teeth

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