Control system and method for smooth characterization of cyclic stress
AssigneeTransportation IP Holdings, LLC
InventorsGayathri Indra Seenumani, Kalpesh Singal, Harry Kirk Mathews, Jr., Etika Agarwal
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Abstract
A control system and method obtain a stress profile of a device disposed onboard industrial equipment. The stress profile represents a stress characteristic of the device over time during operation of the industrial equipment. The system and method determine a smooth zero crossing function based on the stress profile. The smooth zero crossing function includes spikes that represent reversals of the stress characteristic. The system and method generate a control signal based on the smooth zero crossing function.
Claims17
A control system comprising:
- one or more processors configured to:
- obtain a stress profile of a device disposed onboard industrial equipment, the stress profile representing a stress characteristic of the device over time during operation of the industrial equipment;
- determine a smooth zero crossing function based on the stress profile, the smooth zero crossing function including spikes that represent reversals of the stress characteristic;
- and
- generate a control signal based on the smooth zero crossing function,
- wherein the one or more processors are configured to calculate the smooth zero crossing function according to Equation (c):
- y(k)=(1−zc(k))*y(k−1)+zc(k)*u(k−1) Equation (c)
- where y is the smooth zero crossing function, k is a current cycle, zc is a zero crossing, and u is the stress profile.
A method comprising:
- obtaining a stress profile of a device disposed onboard industrial equipment, the stress profile representing a stress characteristic of the device over time during operation of the industrial equipment;
- determining, via one or more processors, a smooth zero crossing function based on the stress profile, the smooth zero crossing function including spikes that represent reversals of the stress characteristic;
- and
- generating, via the one or more processors, a control signal based on the smooth zero crossing function
- wherein determining the smooth zero crossing function comprises applying a signum function to the stress profile, and applying an exp function to an output of the signum function, wherein an output of the exp function is zero when the output of the signum function is one, and the output of the exp function is one whenever the output of the signum function is not one.
A control system comprising:
- one or more processors configured to:
- obtain a state of charge (SOC) profile of a battery pack disposed onboard a vehicle, the SOC profile representing a charge of the battery pack over time during a trip of the vehicle;
- determine a smooth zero crossing function based on the SOC profile, the smooth zero crossing function including spikes that represent charge reversals of the battery pack;
- calculate a charge cycle count based on the smooth zero crossing function;
- and
- generate a control signal to communicate the charge cycle count
- wherein the one or more processors are configured to determine the smooth zero crossing function by applying a signum function to the SOC profile, and applying an exp function to an output of the signum function, wherein an output of the exp function is zero when the output of the signum function is one, and the output of the exp function is one whenever the output of the signum function is not one.
Dependencies are inferred from the claim text.