Natural gas engine ECU spraying device and control method

Abstract

The invention discloses a natural gas engine ECU spraying device and a control method. The natural gas engine ECU spraying device comprises a natural gas engine ECU, spraying electromagnetic valves, avehicle-mounted power source and fuses; the first end of each spraying electromagnetic valve is connected with the vehicle-mounted power source through the corresponding fuse, and the second end of each spraying electromagnetic valve is connected with the natural gas engine ECU; the natural gas engine ECU judges whether a cold starting work condition is implemented or not according to the engineinput condition; if it is judged that the cold starting work condition is implemented, the spraying electromagnetic valve driving waveform is switched to a cold starting waveform mode from a normal waveform mode; if it is judged that the cold starting work condition is not implemented, the spraying electromagnetic valve driving waveform keeps the normal waveform mode; and under the cold starting waveform mode, the peak current of the spraying electromagnetic valve driving waveform is increased to improve the opening performance of the spraying electromagnetic valves. After cold starting is finished, the spraying electromagnetic valve driving waveform is switched to the normal waveform mode from the cold starting waveform mode so as to ensure that the situation that an overlarge driving current flows through the spraying electromagnetic valves for a long time and thus the service lives of the spraying electromagnetic valves are shortened is avoided.

Description

technical field [0001] The invention relates to a natural gas engine ECU injection device and a control method, belonging to the technical field of natural gas engine electronic control. Background technique [0002] In the electronically controlled natural gas engine injection system, the driving and control of the injection solenoid valve is the basis for realizing the precise control of natural gas engine fuel injection. The injection solenoid valve is responsible for the gas injection control function, and is the core device for the normal operation of the engine. The opening and closing action of the injection solenoid valve is realized by controlling the electromagnetic force generated by the solenoid valve drive current waveform. This process involves the interaction of mechanical, electrical, magnetic and other factors. The mechanical energy that moves the armature of the solenoid valve is provided by the electromagnetic force. The electromagnetic force is controlle...

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Problems solved by technology

[0004] For designers, both technical solutions have certain advantages and disadvantages. The advantages of using a dedicated chip and peripheral circuits to build an injection module are: high integration, relatively complete protection functions, simple and convenient application, and comparatively priced advantages The disadvantage is that these special-purpose chips are rarely open to the outside world, and the very few special-purpose chips that are open to the outside world are relatively backward. Foreign manufacturers have used products that are rarely used or even eliminated, and have relatively high technology with the products that foreign manufacturers are mass-producing. gap

Injection modules based on complex programmable logic devices, because the driving current comparison and judgment function is realized by an external hardware circuit, and there is only a fixed circuit threshold, and it does not have the programmable function of the peak current value of the driving waveform, so this function cannot be realized

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