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AssigneeParagon Products B.V.
InventorStephen T. Adelman
Estimating the term…
A pressure sensorless electronic pressure limiting and flow leveling system for an electric pump comprising a multi-mode control process for transferring fluid through a filter feeding a source consuming the fluid as the filter becomes clogged. The multi-mode control process comprising a closed loop current control mode, a pressure limiting control mode for controlling the speed of the motor as a function of a pre-calibrated profile correlating measured motor speed and voltage parameters to a predetermined value in the pre-calibrated profile utilized to set the speed of the motor driving the pump for pumping pressurized fluid through a clogging filter; and a flow leveling control mode correlating measured motor current to a predetermined value in a pre-calibrated profile utilized to set the speed of the motor driving the pump for pumping pressurized fluid as a function of clogging of the filter.
1- A method for controlling a fluid pump delivering fluid through a filter feeding a fluid consuming system;
2- The method of claim 1 wherein the step of transitioning from the closed loop current control mode to the pressure limiting control mode is a function of an increasing back pressure on the fluid pump created by a clogging of the filter.
3- The method of claim 2 wherein the correlated correction profile value is a correlated correction profile current value.
4- The method of claim 3 wherein the step of utilizing the correlated correction profile value to set the speed of the motor driving the fluid pump comprises a step of determining the difference between the correlated correction profile current value and a DC bus current value for defining an error value.
5- The method of claim 4 wherein the step of utilizing the correlated correction profile value to set the speed of the motor driving the fluid pump comprises a step of utilizing the error value for setting the speed of the motor driving the fluid pump for drawing fluid through the inlet port from the fluid source and pumping pressurized fluid out the outlet port and through the filter feeding the fluid consuming system.
6- The method of claim 5 wherein the pressure limiting correction profile is predetermined as a function of an anomalous condition indicative of clogging of a filter.
7- The method of claim 6 wherein the fluid consuming system is an engine of a vehicle.
8- A method for controlling a fluid pump delivering fluid through a filter feeding a fluid consuming system;
9- The method of claim 8 wherein the flow leveling correction profile is predetermined utilizing a plurality of fluid back pressures on the fluid pump including a predefined maximum fluid pump back pressure.
10- The method of claim 8 wherein the system consuming the fluid is an engine of a vehicle.
11- The method of claim 8 further comprising a step of correlating a measured operating speed of the motor driving the fluid pump and a measured voltage utilized in operating the motor for driving the fluid pump to a value in a pressure limiting correction profile for defining a correlated pressure limiting correction profile value.
12- The method of claim 11 comprising a step of transitioning from the flow leveling control mode to a pressure limiting control mode for controlling the operating speed of the motor by utilizing the correlated pressure limiting correction profile value from the pressure limiting correction profile for setting the speed of the motor driving the fluid pump.
13- The method of claim 12 wherein the step of utilizing the correlated pressure limiting correction profile value from the pressure limiting correction profile for setting the speed of the motor driving the fluid pump comprises a step of determining the difference between the correlated pressure limiting correction profile value from the pressure limiting correction profile and a DC bus current value for defining an error value and further comprises a step of utilizing the error value for setting the speed of the motor driving the fluid pump for drawing fluid through the inlet port from the fluid source and pumping pressurized fluid out the outlet port and through the filter feeding the fluid consuming system.
14- A system for controlling a fluid pump delivering fluid through a filter feeding a fluid consuming system;
15- The system of claim 14 wherein transitioning from the closed loop current control mode to the pressure limiting control mode is a function of an increasing back pressure created by a clogging of the filter.
16- The system of claim 15 wherein the means for correlating the measured operating speed and the measured voltage to the value in the correction profile for defining the correlated correction profile value comprises means for correlating the measured operating speed and the measured voltage to a predefined reference current value in the correction profile for defining the correlated correction profile value.
17- The system of claim 16 wherein utilizing the correlated correction profile value from the pressure limiting correction profile to set the speed of the motor driving the fluid pump comprises determining the difference between the correlated correction profile value and a DC bus current value for defining an error value.
18- The system of claim 17 wherein utilizing the correlated correction profile value from the pressure limiting correction profile to set the speed of the motor driving the fluid pump comprises utilizing the error value to set the speed of the motor driving the fluid pump for limiting a maximum pressure that is developed by the pump for drawing fluid through the inlet port from the fluid source and pumping pressurized fluid out the outlet port and through the filter feeding the fluid consuming system.
19- The system of claim 18 wherein the pressure limiting correction profile for defining the correlated correction profile value is predetermined as a function of an anomalous condition indicative of clogging of a filter.
20- The system of claim 19 wherein the fluid consuming system is an engine of a vehicle.