SU368072A1 - METHOD FOR DETERMINING ANGLE TORCH FOR NOZZLE - Google Patents

Description

one

The invention is intended to test the injectors of internal combustion engines.

Methods are known for determining the spraying angle using sensors arranged in the same horizontal plane diametrically opposed to each other and moving in the direction perpendicular to the axis of the nozzle towards each other prior to contact with the spray cone.

The angle value is recorded on a special device.

The disadvantage of the known method is seen in the measurement error of the angle arising from the eccentricity and asymmetry of the angle of the sprayed cone relative to the axis of the nozzle, as well as associated with the different position of the different cone angle nozzles defining the basic parameter of the reference angle. As a result, when using known methods, it becomes necessary to change the device when switching to a different type of nozzle.

The aim of the invention is to improve the measurement accuracy and eliminate the dependence of the setting of the recording device on the standard size of the nozzle.

The task to achieve this goal is to exclude from the measured parameters the position of the vertex of the cone and interact with the torch of the sensors.

To solve this problem, the sensors (photosensitive elements) are moved in the tene & e plane of the torch, fixing the moment of intersection

images of each element. The difference in their displacements determines the magnitude of the torch angle.

The essence of the method is illustrated by the scheme.

The diagram shows four consecutive positions of the photosensitive elements relative to the shadow of the nozzle plume cone.

When spilling an injector 1, the cone of the spike illuminated by the light source gives a shadow

image 2. According to the shadow image, in the direction perpendicular to the axis of the nozzle, two photosensitive elements 3 and 4, set at a distance a from each other in a plane parallel to the axis of the nozzle, move at the same speed.

By changing the signals from the photosensitive elements, the moments of intersection of the cone shadow border are recorded, first with one and then with another photosensitive element. For example, from the moment of entry into the shadow of a single element, the pulses that carry information about the position of this element begin to swell. At the time of entry of another element, the counting of pulses ends.

According to the number of registered pulses, the distance b is determined by the photosensitive element 4 in the shade. The ratio of this distance to the distance between the photosensitive elements a characterizes the magnitude of the angle a, which is half the spray angle

.arctg-.

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At a constant distance between the elements, pulse counting can be performed, for example, by a functional converter that implements a piecewise linear approximation of the function arctg.-. In this case, the result of the measurement can be determined in the desired angular units.

The described method makes it possible to measure another component of the total spray angle p, which makes it possible, with an asymmetrical spray angle, to more accurately determine the total spray angle and the value of its asymmetry.

To do this, the photosensitive. - Elements 5 and 4 are moved to their exit from the shadow, fixing the moments of intersection of the face-dyna with both elements. The reception described for determining the angle cp is also determined by the angle p.

The subject of "s about and and

A method for determining the angle of a nozzle plume, for example, an internal combustion engine, by moving sensitive

elements with respect to the axis of the torch, characterized in that, in order to improve accuracy, the elements are moved in the plane of the shadow image of the torch, fixing the instant of intersection of the image with each element, and the difference of their displacements determines the angle of the torch.

Gy.