Processing device for speed signal

Abstract

The invention provides a rotating speed signal handling device. The device comprises a flywheel sensor, a filter device, a window 1 handling device, a window 2 handling device, a window 3 handling device, an intercepting handling device, a first quick handling device, a second quick handling device and a coordinating calculating module, wherein the output of the flywheel sensor is connected to theinput of the filter device; the inputs of the window 1 handling device, the window 2 handling device and the window 3 handling device are connected to the output of the filter device, and the outputsof the window 1 handling device, the window 2 handling device and the window 3 handling device are correspondingly connected to the input of the intercepting handling device, the input of the first quick handling device and the input of the second quick handling device; the outputs of the first quick handling device, the intercepting handling device and the second quick handling device are connected to the coordinating calculating module. The rotating speed signal handling device is capable of handling with a rotating speed signal with high efficiency, high reliability and high accuracy.

Description

technical field [0001] The invention relates to the field of internal combustion engine control, in particular to a speed signal processing device. Background technique [0002] As we all know, the biggest advantage of the electronically controlled common rail system is that rail pressure control and fuel injection control are completely independent, and to achieve precise fuel injection, it is necessary to accurately obtain the engine rotation angle. Typically, this information is obtained by a chainring fixed to the crankshaft, which comprises equally spaced teeth of equal width. Furthermore, in order to distinguish between the compression stroke and the exhaust stroke of a four-stroke engine, the chainring has a reference area, usually achieved by the absence of two or several consecutive teeth. A sensor is used on the edge of the toothed plate to collect the tooth signal, thereby obtaining the angle signal, knowing the position of the piston, and injecting oil accuratel...

AI Technical Summary

Problems solved by technology

First of all, the CPU load is too heavy, because the interference signals that need to be in the A section need to be interrupted, and whether it is an interference tooth is judged according to the tooth interval ratio, which is very unfavorable for the embedded common rail control system with particularly high real-time requirements.

Secondly, the coefficients used in the calculation window are too general and rough, and only a small part of interference signals can be filtered out. It is easy to confuse interference signals with normal signals and affect the accuracy of fuel injection control.

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