US 2026/0264847 A1Published application

Method to decrease computational cost on an n-dimensional table

AssigneePratt & Whitney Canada Corp.

InventorJonathan Pariser

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Abstract

A method includes obtaining at a first sampling time, a first set of n sampled values of n control parameters for one or more control systems of an aircraft. The method includes performing, in a higher power mode, a first sequential lookup and interpolation operation of a table maintained in the memory to obtain a first output control value, and sending, the first output control value to the one or more control systems of the aircraft. Determining that at least one condition associated with a first steady state has been satisfied and switching to a first lower power mode of the device. In the first lower power mode, performing a second sequential lookup and interpolation operation to obtain a second output control value and sending the second output control value to the one or more control systems of the aircraft.

Claims20

Dependent claims

A method, comprising:

obtaining at a first sampling time, at a device comprising a processor and a memory, a first set of n sampled values of n control parameters for one or more control systems of an aircraft, wherein n is a finite positive integer greater or equal to 2;
performing, in a higher power mode, a first sequential lookup and interpolation operation of a table maintained in the memory to obtain a first output control value, wherein the table maintained in the memory has at least n dimensions, the n dimensions corresponding to each of the n control parameters, and wherein during the first sequential lookup and interpolation operation, all of the first set of n sampled values are used as current values in the first sequential lookup and interpolation operation;
sending, the first output control value to the one or more control systems of the aircraft;
determining that at least one condition associated with a first steady state has been satisfied;
responsive to determining that the at least one condition associated with the first steady state has been satisfied, switching to a first lower power mode of the device;
obtaining, at a second sampling time subsequent to the first sampling time, a second set of sampled values of the control parameters, wherein the second set of sampled values of the control parameters comprises a first reduced subset of values of the n control parameters;
in the first lower power mode, performing a second sequential lookup and interpolation operation of the table maintained in the memory to obtain a second output control value, wherein, during the second sequential lookup and operation, the second set of sampled values of the control parameters are used as current values to perform the second sequential lookup and interpolation operation;
and
sending the second output control value to the one or more control systems of the aircraft.

6 more elements

An apparatus, comprising:

a memory;
an input/output (I/O) unit;
and
a processor configured to:
obtain at a first sampling time, via the I/O unit, a first set of n sampled values of n control parameters for one or more control systems of an aircraft, wherein n is a finite positive integer greater or equal to 2;
perform, in a higher power mode, a first sequential lookup and interpolation operation of a table maintained in the memory to obtain a first output control value, wherein the table maintained in the memory has at least n dimensions, the n dimensions corresponding to each of the n control parameters, and wherein during the first sequential lookup and interpolation operation, all of the first set of n sampled values are used as current values in the first sequential lookup and interpolation operation;
send the first output control value to the one or more control systems of the aircraft via the I/O unit;
determine that at least one condition associated with a first steady state has been satisfied;
responsive to determining that the at least one condition associated with the first steady state has been satisfied, switch to a first lower power mode;
obtain, via the I/O unit, at a second sampling time subsequent to the first sampling time, a second set of sampled values of the control parameters, wherein the second set of sampled values of the control parameters comprises a first reduced subset of values of the n control parameters;
in the first lower power mode, perform a second sequential lookup and interpolation operation of the table maintained in the memory to obtain a second output control value, wherein, during the second sequential lookup and operation, the second set of sampled values of the control parameters are used as current values to perform the second sequential lookup and interpolation operation;
and
send the second output control value to the one or more control systems of the aircraft via the I/O unit.

10 more elements

A non-transitory, machine-readable medium containing instructions, which when executed by a processing device of an apparatus comprising a memory and an input/output (I/O) unit, cause the apparatus to:

obtain at a first sampling time, via the I/O unit, a first set of n sampled values of n control parameters for one or more control systems of an aircraft, wherein n is a finite positive integer greater or equal to 2;
perform, in a higher power mode, a first sequential lookup and interpolation operation of a table maintained in the memory to obtain a first output control value, wherein the table maintained in the memory has at least n dimensions, the n dimensions corresponding to each of the n control parameters, and wherein during the first sequential lookup and interpolation operation, all of the first set of n sampled values are used as current values in the first sequential lookup and interpolation operation;
send the first output control value to the one or more control systems of the aircraft via the I/O unit;
determine that at least one condition associated with a first steady state has been satisfied;
responsive to determining that the at least one condition associated with the first steady state has been satisfied, switch to a first lower power mode;
obtain, via the I/O unit, at a second sampling time subsequent to the first sampling time, a second set of sampled values of the control parameters, wherein the second set of sampled values of the control parameters comprises a first reduced subset of values of the n control parameters;
in the first lower power mode, perform a second sequential lookup and interpolation operation of the table maintained in the memory to obtain a second output control value, wherein, during the second sequential lookup and operation, the second set of sampled values of the control parameters are used as current values to perform the second sequential lookup and interpolation operation;
and
send the second output control value to the one or more control systems of the aircraft via the I/O unit.

6 more elements

Dependencies are inferred from the claim text.