Fluid impeller controller
Circuits for controlling an impeller in a fluid flow distribution system to achieve a target fluid flow are disclosed. The circuit to output a signal representative of a speed value (N T ) of the impeller derived from a stored power consumption value (W i ) and speed value (N i ) pairs to achieve the target fluid flow. The circuit to receive a power signal representative of an input power consumption value (W) of the impeller at the speed value (N T ) to input fluid to the fluid flow distribution system and to compare the value (W) represented by a power signal for the speed value (N T ) with the stored value (W i ) and impeller speed value (N i ) pairs to determine a least difference impeller speed value (N L ) of the stored pair comprising a least difference between the value (W) and the value (W i ). The circuit to output a speed signal representative of value (N L ).
1. A circuit for controlling a fluid impeller in a fluid flow distribution system to achieve a target fluid flow, the circuit:
to output a speed signal representative of a fluid impeller speed value (N T ) of the fluid impeller derived from a stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to achieve the target fluid flow;
to receive a power signal representative of an input power consumption value (W) of the fluid impeller at the fluid impeller speed value (N T ) to input a fluid to the fluid flow distribution system;
to compare the input power consumption value (W) represented by the power signal input to the circuit for the fluid impeller speed value (N T ) with the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to determine a least difference fluid impeller speed value (N L ) of the stored pair comprising a least difference between the input power consumption value (W) and the stored power consumption value (W i ); and
responsive to determining the least difference fluid impeller speed value (N L ), to output a speed signal representative of the least difference fluid impeller speed value (N L ).
2. A circuit according to claim 1 , the circuit to compare the input power consumption value (W) represented by a power signal input to the circuit for the least difference fluid impeller speed value (N L ) with each of the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to determine a second least difference fluid impeller speed value (N′ L ) of the stored pair comprising a least difference between the input power consumption value (W) and the stored power consumption value (W i ).
3. A circuit according to claim 1 , responsive to initiation of operation of the fluid impeller, to output the speed signal representative of the fluid impeller speed value (N T ) to achieve the target fluid flow.
4. A circuit according to claim 3 , wherein the speed signal representative of the fluid impeller speed value (N T ) to achieve the target fluid flow is initially derived from the stored power consumption value (W i ) and fluid impeller speed value (N i ) pair comprising a lowest speed value of fluid impeller speed value (N i ).
5. A circuit according to claim 1 , to access a memory store comprising the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs.
6. A circuit according to claim 5 , comprising the memory store.
7. A circuit according to claim 1 , wherein the circuit includes a processor and a memory store comprising instructions executable by the processor.
8. A printer, comprising a circuit according to claim 1 .
9. A method for controlling a fluid impeller in a fluid flow distribution system to achieve a target fluid flow, the method comprising:
outputting a speed signal representative of a fluid impeller speed value (N T ) of the fluid impeller derived from a stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to achieve the target fluid flow;
receiving a power signal representative of an input power consumption value (W) of the fluid impeller at the fluid impeller speed value (N T ) to input a fluid to the fluid flow distribution system;
comparing the input power consumption value (W) represented by the power signal input to the circuit for the fluid impeller speed value (N T ) with the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to determine a least difference fluid impeller speed value (N L ) of the stored pair comprising a least difference between the input power consumption value (W) and the stored power consumption value (W i ); and
responsive to determining the least difference fluid impeller speed value (N L ), outputting a speed signal representative of the least difference fluid impeller speed value (N L ).
10. A method according to claim 9 , further comprising comparing the input power consumption value (W) represented by an input power signal for the least difference fluid impeller speed (N L ) with each of the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs to determine a second least difference fluid impeller speed value (N′ L ) of the stored pair comprising a least difference between the input power consumption value (W) and the stored power consumption value (W i ).
11. A method according to claim 9 , further comprising outputting the speed signal representative of a fluid impeller speed value (N T ) to achieve the target fluid flow responsive to initiation of operation of the fluid impeller.
12. A method according to claim 11 , further comprising initially deriving the speed signal representative of a fluid impeller speed value (N T ) to achieve the target fluid flow from the stored power consumption value (W i ) and fluid impeller speed value (N i ) pair comprising a lowest speed value of fluid impeller speed value (N i ).
13. A method according to claim 9 , further comprising accessing a memory store comprising the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs.
14. A non-transitory machine readable medium, comprising processor executable instructions executable by a processor to implement a method according to claim 9 .
15. A method according to claim 9 , further comprising looking up the stored power consumption value (W i ) and fluid impeller speed value (N i ) pairs in a look up table.