Electrical control management unit for engine fuel gas

Abstract

The invention discloses an electrical control management unit for engine fuel gas. The electrical control management unit comprises a main control unit as well as an ignition drive and ignition feedback circuit, an oil injection drive and fault diagnosis circuit, a low side drive and fault diagnosis circuit, a step motor drive and fault diagnosis circuit, an oxygen sensor heating and fault diagnosis circuit, an analog input signal processing unit, a switch value input signal processing unit, a data storage unit, a knock signal processing unit, a frequency signal processing circuit, a power supply and reset management unit and a communication unit which are connected with the main control unit respectively. According to the electrical control management unit, crankshaft signal processing circuits in the power supply and reset management unit, the communication unit and the frequency signal input unit are changed to integrated combination from discrete chips; not only are three discrete circuit units reduced, but also the consumption of integrated chips is remarkably reduced, so that the purpose of reducing the cost is achieved; meanwhile, an oxygen sensor heating drive circuit controlled by the integrated chips is changed to be built by discrete devices to improve the heating drive capability.

Description

technical field [0001] The invention specifically relates to an engine gas electric control management unit, which belongs to the field of engine control. Background technique [0002] At present, in the design scheme of the engine gas electric control unit, it is generally adopted to use an integrated chip or even several integrated chips for each functional circuit, and then the main control unit coordinates the control, that is, the electronic control unit is divided into the main control unit, Idling stepper motor drive unit, power management unit, reset processing unit, low-side drive output unit, K line communication unit, CAN communication unit, knock signal processing unit, storage unit, ignition drive unit, fuel injection drive unit, each unit Using an independent dedicated integrated chip, combined with a switch input unit, a frequency signal input unit, and an analog signal input unit ( figure 1 ). In this way, the number of chips used in the entire electronic c...

AI Technical Summary

Problems solved by technology

With this structural circuit, the voltage after voltage division will also fluctuate, so that the voltage value obtained through analog-to-digital conversion is also prone to fluctuations, resulting in inaccurate judgments on the effectiveness of ignition, so that fuel injection cannot be effectively controlled, and emission standards will also be affected.

Secondly, there is another disadvantage of collecting the ignition signal by resistive voltage division, that is, an ignition feedback circuit is required for the ignition output signal of each cylinder to detect the ignition output of each cylinder separately, resulting in more engine cylinders and more repeated circuits, resulting in Increased costs and difficulty ensuring controlled and optimized combustion is up to standard

Images