Scans Associates, Inc.

Peter J Mosher

Richard L Smith

This invention relates to a method and apparatus for reproducing operating conditions in induced flow devices, such as carburetors and the like, and more particularly to a system for reproducing such operating conditions which may be used in testing systems designed to test induced flow devices. In operation in such a test system, the apparatus of the present invention would cause a given air flow to flow through an induced flow device such as a carburetor, and then would cause the throttle plate of the carburetor to be rotated until the desired manifold vacuum in the carburetor is obtained, at which time the test of the carburetor could take place. By providing a throttle drive controller to move the carburetor throttle at a speed which is proportional to the difference in the manifold vacuum actually present in the carburetor, and the desired manifold vacuum, a very rapid movement of the throttle plate between test points can be had, but at the same time a slow approach to the actual test point, to prevent overshoot, is accomplished. A continuous monitoring of the difference between the manifold vacuum in the carburetor, and the desired manifold vacuum, is accomplished by a continuous reading and comparing of electrical signals, in either a manual or computer controlled system, in which the two signals are first compared to determine which way the carburetor throttle must be moved to approach the desired test point, and then the actual difference between the two signals is computed to determine how many additional pulses must be supplied to the stepping motor forming part of the carburetor throttle drive controller to control the drive as described above. The operations reproducing system of the present invention works equally as well computer or manually controlled, or with sonic or subsonic air flow measuring devices.

Apparatus for reproducing operating conditions in induced flow devices

This invention relates to a method and apparatus for reproducing operating conditions in induced flow devices, such as carburetors and the like, and more particularly to a system for reproducing such operating conditions which may be used in testing systems designed to test induced flow devices. In operation in such a test system, the apparatus of the present invention would cause a given air flow to flow through an induced flow device such as a carburetor, and then would cause the throttle plate of the carburetor to be rotated until the desired manifold vacuum in the carburetor is obtained, at which time the test of the carburetor could take place. By providing a throttle drive controller to move the carburetor throttle at a speed which is proportional to the difference in the manifold vacuum actually present in the carburetor, and the desired manifold vacuum, a very rapid movement of the throttle plate between test points can be had, but at the same time a slow approach to the actual test point, to prevent overshoot, is accomplished. A continuous monitoring of the difference between the manifold vacuum in the carburetor, and the desired manifold vacuum, is accomplished by a continuous reading and comparing of electric signals, in either a manual or computer controlled system, in which the two signals are first compared to determine which way the carburetor throttle must be moved to approach the desired test point, and then the actual difference between the two signals is computed to determine how many additional pulses must be supplied to the stepping motor forming part of the carburetor throttle drive controller to control the drive as described above. The operations reproducing system of the present invention works equally as well computer or manually controlled, or with sonic or subsonic air flow measuring devices.

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Northville, MI, United States of America

Peter J Mosher