Detection method and control system for detecting tightness of engine air cylinder as well as engine system

Abstract

The invention discloses a detection method and a control system for detecting the tightness of an engine air cylinder as well as an engine system. The method comprises the following steps of: firstly, obtaining an engine real-time rotating speed signal and a crank real-time rotating angle signal; secondly, selecting a first crank rotation angle a1 and a second crank rotation angle a2 and selecting engine rotating speeds b1 and b2 corresponding to two different crank rotating angles within the same period of crank rotation according to the real-time signals, and calculating an absolute value of b1-b2 so as to further judge whether the absolute value of a difference value between the absolute value of b1-b2 and a rotating speed standard value b of an internal engine is more than a pre-set standard value C or not; and finally, sending a corresponding display instruction according to a judging result. With the adoption of the detecting method, the detection of the tightness of the air cylinder can be realized under an engine operation state. Therefore, an operator is good for knowing about an operation condition of the air cylinder in real time; the engine can be prevented from being operated under a working condition of low tightness; and the use efficiency of the engine can be improved and the service life of the other parts can be prolonged.

Description

technical field [0001] The invention relates to the technical field of automatic control of engineering machinery, in particular to a detection method, a control system and an engine system for the sealing performance of an engine cylinder. Background technique [0002] The engine system is an important power component in engineering vehicles, and plays a vital role in the normal operation and exercise of engineering vehicles. [0003] Traditional engine systems in the prior art generally include two major mechanisms and five major systems, i.e. a crank-and-rod mechanism, a gas distribution mechanism, a fuel system, a lubrication system, a cooling system, an ignition system, and a starting system. The electronically controlled engine also includes a control system. The crank-and-rod mechanism includes the engine cylinder, the piston placed inside the cylinder, the connecting rod, the crankshaft, and the flywheel. The gas pressure moves in a straight line in the cylinder, wh...

AI Technical Summary

Problems solved by technology

[0005] However, it is difficult to directly measure the air leakage of the cylinder under the operating conditions of the engine, and there is currently no method to detect the airtightness of the cylinder

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