Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed

Abstract

The invention discloses a zero point judgment and control mechanism for a valve stroke of an internal combustion engine air flue current stabilization test bed. According to the technical scheme, the zero point judgment and control mechanism is formed by combination of two vertical plates, extension shafts of two transverse linear stepping motors, and a transverse arm, wherein a gantry type frame is formed above a work table top, and a hydraulic cylinder shaft enables the frame to shift up and down. Steering motors are fixed on connecting blocks of the extension shafts of the transverse linear stepping motors, cylindrical gear plates are welded with transverse arm short shafts, and the steering motors drive the gear plates and gears to enable the transverse arm to rotate. Two longitudinal linear stepping motors are fixed on the transverse arm, a sensor upper sleeve and a sensor lower sleeve are connected with the lower ends of the extension shafts of the motors, a guiding sliding sleeve, a lower ejector rod and a pressure sensor are arranged in each sleeve, each pressure sensor is contacted with the top face of each guiding sliding sleeve to output signals to a computer to detect through displacement of each lower ejector rod. The mechanism not only can eliminate manual installation and disassembling operation of a cylinder cover pressing plate, the valve stroke is high in control precision, and zero point judgment can be carried out on cylinder covers of different kinds of valve spring pre-tightening force.

Description

technical field [0001] The invention belongs to the detection technology of internal combustion engine performance parameters, and in particular relates to a test detection device for measuring and controlling the engine valve position or lift displacement. Background technique [0002] It is well known that the internal combustion engine is the largest oil consumption industry, accounting for about 60% of my country's total oil consumption; at the same time, the emission of motor vehicles has exacerbated the deterioration of the urban environment, so it is of great significance to the innovation of energy saving and emission reduction technology for internal combustion engines. The air passage of an internal combustion engine acts as a "throat", and its flow performance significantly affects fuel consumption and emission levels. In order to achieve good power, economy and emission characteristics of the internal combustion engine, the prerequisite is that the air passage mu...

AI Technical Summary

Problems solved by technology

This method destroys the integrity of the valve structure, and the long-term use of the gasket causes the zero point judgment and control accuracy of the valve lift to decrease due to wear; (2) The method of using a pointer dial indicator and installing a pressure plate

Although this method makes up for the defects of the first method, the determination of the zero point of the valve lift is still subject to the subjective influence of the tester, resulting in obvious changes in the test error before and after; The transmission controls the valve lift precisely

This method still needs to use the pressure plate to fix the measuring device, and the zero point judgment is still subject to the experience of the tester, and the accuracy is low and difficult to control

In addition to the cumbersome operation process of the above method, when testing different cylinders, the tester needs to manually change the pressure plate, which will cause the test system to be unable to adapt to the rhythm of the online detection of the engine cylinder head, and limit the test work of the airway steady flow test bench efficiency improvement

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