Method for correcting ignition timing of natural gas and gasoline dual fuel engine

Abstract

The invention discloses a method for correcting ignition timing of a natural gas and gasoline dual fuel engine. In the method, based on the conventional gasoline engine control system, an ignition timing correction module is arranged in the conventional fuel control; the ignition timing output by the ignition timing correction module comprises an ignition timing signal in a gasoline mode and an ignition timing signal in a natural gas mode; the ignition timing signal in the gasoline mode is output by an electronic control unit (ECU) of the conventional gasoline engine; in the natural gas mode, the natural gas ignition timing is to correct the gasoline ignition timing of the engine under the conditions of the same rotating speed and the same load; corrected ignition MAP is checked according to the rotating speed signal and the load of the engine so as to obtain a corrected ignition timing; and the sum of the gasoline ignition timing and the corrected ignition timing is the ignition timing of the natural gas. By the method, the control logic of the dual fuel ECU in the prior art can be optimized.

Description

technical field [0001] The invention belongs to the field of engine electronic control, and relates to a dual-fuel engine control system, in particular to an ignition timing correction method for a natural gas and gasoline dual-fuel engine. Background technique [0002] With the increasingly serious environmental and energy problems, natural gas has become one of the important fuels for engines. Retrofitting a gasoline engine into a natural gas / gasoline dual-fuel engine can make more efficient use of energy and alleviate the environmental crisis. [0003] The block diagram of the existing natural gas / gasoline dual-fuel engine control system is as follows: figure 1 As shown, in the single ECU of the dual-fuel engine control system, the control logic in gasoline mode and the control logic in natural gas mode are stored; in terms of actuator drive, the fuel injector is driven by a high-power drive circuit and a power driver. The air nozzle is driven by a high-power driving ci...

AI Technical Summary

Problems solved by technology

The increased high-power driving circuit and power driver for driving the air nozzle will greatly change the original gasoline engine ECU hardware circuit, and the ECU hardware circuit structure is complicated and the cost is high

However, the single ECU of the dual-fuel engine stores the ignition timing control logic in gasoline mode and the ignition timing control logic in natural gas mode. The control logic of the original gasoline engine ECU is changed a lot, the amount of stored code is doubled, the memory consumption is large, and the operating efficiency is reduced.

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