US 4,474,204 AGranted

Delivery and metering device control system

AssigneeThe Western Company of North America

InventorJoe E. West

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Abstract

A control system (10) is provided for maintaining a constant fluid level in a mixing container of a delivery and metering device. Structure (12) is provided for monitoring the fluid level in the mixing container and for generating a level signal (14) representing the fluid level present in the mixing container. Structure (18) is further provided for establishing a desired amount of fluid entering the mixing container and for generating a first control signal (20). Structure (22) is provided for establishing a desired amount of fluid discharged from the mixing container and for generating a second control signal (24). Measuring devices (30, 34) are utilized for measuring the amount of fluid discharged from the mixing container and for generating a discharge signal (36) representing the amount of fluid discharged from the mixing container. Circuitry (16) is provided for receiving the control signals (20, 24) and the level signal (14) for generating pump signals (40, 42) applied to inlet and discharge port pumps in response to the discharge signal (36).

Claims6

Dependent claims

In a delivery and metering device wherein fluids are delivered to a mixing container through an inlet port and discharged from the mixing container through a discharge port, each of the ports having an associated pump for controlling the amount of fluid passing through the port, a control system for maintaining a constant fluid level in the mixing container comprising:

means for monitoring the fluid level in the mixing container and for generating a level signal representing the fluid level present in the mixing container;
means for establishing a desired amount of fluid entering the mixing container and for generating a first control signal;
means for establishing a desired amount of fluid discharged from the mixing container and for generating a second control signal;
means for measuring the amount of fluid discharged from the mixing container and for generating a discharge signal representing the amount of fluid discharged from the mixing container;
and
circuit means for receiving said control signals and said level signal for generating pump signals applied to the inlet and discharge pumps associated with the inlet and discharge ports in response to said discharge signal to thereby control the inlet and discharge fluid rate, such that the fluid level is maintained constant in the mixing container.

3 more elements

Dependencies are inferred from the claim text.