Optical synchronizing signal labeling system for optical diagnosis of combustion system of internal-combustion engine

Abstract

The invention relates to an optical synchronizing signal labeling system for optical diagnosis of a combustion system of an internal-combustion engine, comprising a labeling code disc, image acquisition equipment and a connection fixing mechanism; a light guide device and a laser tube are respectively arranged on the connection fixing mechanism, the laser beam inlet end of the light guide device and the laser beam transmitting terminal of the laser tube are oppositely arranged, the laser beam output end of the light guide device is toward to the image acquisition equipment, and two labeling holes are arranged on the labeling code disc; the labeling system has simple structure, and has no time-delay problems of circuits and optical-to-electrical conversion, and has no delay of optical signals; under a condition that the rotating speed of the engine caused by combustion is fluctuated instantaneously, accurate correction computation does not need aiming at the rotating speed, so as to ensure the brightness of the optical signals, be convenient for regulation, improve the signal synchronizing precision and the combustion analysis reliability, be suitable for a visual experiment rack of the internal-combustion engine structure which is frequently reconstructed or regulated and have great significance to the visual research in an internal-combustion engine cylinder.

Description

technical field [0001] The invention belongs to the technical field of laboratory equipment, and relates to an image synchronous signal providing device for a visualized optical engine, in particular to an optical synchronous signal marking system for optical diagnosis of an internal combustion engine combustion system. Background technique [0002] The optical diagnosis of internal combustion engine combustion is an important basis for advanced research and development and simulation calculations of internal combustion engines. In the visualization research of the engine cylinder, whether modern optical testing or traditional optical testing is used, the synchronization determination of the optical signal and the crankshaft is an important link in the experiment, and the error in this link directly affects the mixture formation process and combustion phase. Research accuracy, such as a large deviation in the correspondence between the optical signal and the crank angle, wil...

AI Technical Summary

Problems solved by technology

The traditional method is to directly record the working time and crankshaft signal of the photoelectric system from a certain base point, but this process requires equipment to support, and the timing and system delay of each equipment must be accurately calculated. In addition, there are cumulative errors in computer sampling timing. so inconvenient to use

The current solution is to install an electrical signal generating device at the flywheel of the engine, and then drive the light-emitting diode to flash at the compression top dead center. This system can obtain the compression top dead center mark directly from the picture of the optical measurement result, but the brightness of the light-emitting diode and There is a certain system delay in the extinguishing system, and these delays may cause errors when the engine is running at a high speed, and the error relative to the crankshaft angle is also different for different speeds. If it is necessary to replace devices with different performance, the system delay of the circuit may be Need to re-evaluate, in addition, the brightness and brightness adjustment range of the LED is limited, which is not suitable for the shooting requirements of the camera

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