Adjustment method of ignition angle and ignition energy of gasoline and natural gas dual-fuel engine

Abstract

The invention discloses a method for adjusting the ignition angle and ignition energy of a gasoline and natural gas dual-purpose fuel engine. According to the method for adjusting the ignition angle and the ignition energy of the gasoline and natural gas dual-purpose fuel engine, in a natural gas mode, a natural gas ECU sends the adjustment angle of the ignition angle and the adjustment value of the ignition energy to a gasoline ECU through a CAN line, the gasoline ECU uses the adjustment angle of the ignition angle and the adjustment value of the ignition energy to correct the original gasoline ignition angle and the original ignition energy value, the fact that the natural gas ECU is used to adjust the signal of a crankshaft / camshaft is not involved so that the matched electromagnetic property relation between the gasoline ECU and a crankshaft / camshaft sensor cannot be damaged, the identification of the gasoline ECU on the signal of the crankshaft / camshaft at the low rotating speed cannot be influenced, and therefore the engine can be started possibly by using the natural gas, and the use convenience can be greatly improved; and meanwhile, the ignition angle and the ignition energy in the natural gas mode are adjustable, and therefore the performance of the natural gas can be exerted to the maximum extent, the fuel economical efficiency can be improved, and emission can be reduced.

Description

technical field [0001] The invention relates to a method for adjusting the ignition angle and ignition energy of a gasoline and natural gas dual-purpose fuel engine, which belongs to the technical field of engine control systems. Background technique [0002] For gasoline and natural gas dual-purpose fuel engines converted from gasoline engines, the ignition system of the original gasoline engine is generally still used due to the limitation of modification cost and difficulty. When burning natural gas, due to the combustion characteristics of natural gas itself, the ignition angle when burning natural gas is larger than that when burning gasoline under the same working condition, but the ignition angle data of the gasoline system cannot be modified to adapt to the combustion of natural gas. [0003] At present, most gasoline and natural gas dual-purpose fuel engines use a device commonly known as an ignition advancer to intercept the original engine crankshaft signal and ou...

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Problems solved by technology

[0004] However, there is a problem with this ignition angle adjustment method. When designing the engine ECU, the electromagnetic characteristics of the crankshaft sensor and the engine ECU need to be matched. When the ignition advancer is connected in series between the engine crankshaft signal and the gasoline ECU, the ignition The circuit in the advancer will destroy the good matching relationship between the crankshaft sensor and the original ECU to a certain extent, resulting in the increase of the minimum engine speed that the ECU can recognize. Since the engine can only judge the phase after recognizing the crankshaft signal, Further fuel injection and ignition, it can be recognized that the increase of the minimum speed will cause the engine to start the first time of fuel injection and ignition later, when the starter motor drag speed is too low, the speed may not be recognized, directly affecting the The starting performance of the engine is also an important reason why the gasoline and natural gas dual-fuel engines that use the ignition advancer to adjust the ignition currently use gasoline to start the engine

At the same time, the current ignition advancer can only change the ignition angle of the engine. When natural gas is used, the ignition energy still uses the ignition energy of gasoline combustion, resulting in a decrease in ignition efficiency and affecting engine power performance and emission performance.

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