An engine injection control method and device

Abstract

The invention provides an engine injection control method and device, comprising: when the engine is powered on and started, judging whether the engine is in a low temperature working condition; when the engine is not in a low temperature working condition, controlling the engine to enter a first working mode, and in the first working mode In the mode, the driving pin of the engine electronic control system is switched to the first fuel injection system, and the engine uses the first fuel as the kinetic energy; when the engine is in a low temperature condition, the engine is controlled to enter the second working mode, in the second working mode, The driving pin of the engine electronic control system is switched to the second fuel injection system, and the engine uses the second fuel to provide kinetic energy; it is judged whether the engine exits the low temperature working condition, and when it is detected that the engine exits the low temperature working condition, it is judged whether the engine enters the fuel cut condition. , when the engine enters the fuel cut state, the engine is controlled to enter the first working mode, which reduces the design cost of the engine switching between the two fuel modes.

Description

technical field [0001] The present invention relates to the technical field of engines, in particular to an engine injection control method and device. Background technique [0002] At low temperature, the ignition concentration of methanol is relatively concentrated. Due to the limitation of the saturated vapor pressure of methanol, the concentration of methanol vapor cannot reach the lowest ignition limit. At the same time, the latent heat of vaporization of methanol is 7 times that of gasoline, which further reduces the temperature of methanol vapor. Pure methanol engines with methanol as fuel are difficult to start below 10°C. In the prior art, methanol engines usually use gasoline as fuel for starting and running at low temperature, and then switch to methanol as fuel after the engine temperature rises. [0003] Taking the common 6-cylinder in-line engine as an example, in order to control the methanol engine, the electronic control system (ECU) needs to have 6-way meth...

AI Technical Summary

Problems solved by technology

In addition to redesigning the pins (the pins are used to control the 6-way methanol injection drive and the 6-way ignition coil drive, an additional 6-way gasoline injection drive is required to control) the electronic control system for such application scenarios, the existing electronic control system is very difficult. There are not enough driving pins to meet the needs of matching methanol engines, and an additional switch and electronic control system are required to control gasoline separately, which increases control costs and complexity, and reduces system stability

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