Patent ID: 8746270
Filing Date: 2014-06-10
Classification: G05D,Y10T

Abstract:
1. A method for controllably delivering an additive fluid into a host fluid in a target system at a desired volumetric flow rate, the method comprising: providing a binary supply injector connected in an additive fluid delivery system between a pressurized supply of the additive fluid and the target system, the binary supply injector being controllable between an ON state which permits flow of the additive fluid therethrough and an OFF state which prevents flow of the additive fluid therethrough; iteratively repeating: (a) estimating a volumetric flow rate of the additive fluid between the pressurized supply and the target system; (b) if the estimated volumetric flow rate is greater than the desired volumetric flow rate, controlling the supply injector to its OFF state; and (c) if the estimated volumetric flow rate is less than the desired volumetric flow rate, controlling the supply injector to its ON state; wherein each iterative repetition of steps (a), (b) and (c) further comprises: evaluating whether any additive fluid should be delivered to the target system prior to performing steps (a), (b) and (c); and if the evaluation determines that additive fluid should be delivered to the target system, then performing steps (a), (b) and (c); but if the evaluation determines that additive fluid should not be delivered to the target system, then: wherein evaluating whether any additive fluid should be delivered to the target system comprises: receiving a first signal from the target system indicating whether the host fluid is flowing in the target system; receiving a second signal indicating whether it is desirable that the host fluid flowing in the target system receive the additive fluid; and concluding that additive fluid should be delivered to the target system only if the first signal indicates that the host fluid is flowing in the target system and the second signal indicates that it is desirable that the host fluid receive the additional fluid.