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US 2023/0155149 A1Published application
Pi control partial derivative based i-term for wind-up prevention
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsJared M. Farnsworth, Daniel C. Folick
Life of this patent
Estimating the term…
Abstract
The systems, devices, and methods described herein relate to heating and cooling automotive fuel cells. A proportional-integral-derivative (PID) controller may be used to control the temperature of fluid in the fuel cells. The PID may be configured to calculate and control the saturation limits of the I-term of the PID controller to reduce integral wind-up.
Claims20
A system for heating or cooling a fuel cell stack of a vehicle, comprising:
- a fuel cell stack having a plurality of fuel cells;
- an actuator having an actuator position and configured to control fluid flow to increase or decrease a fluid temperature of a fluid in the plurality of fuel cells;
- and
- an electronic control unit (ECU) coupled to the actuator, the ECU including a proportional-integral-derivative (PID) controller;
- wherein the ECU is configured to:
- determine a temperature of the fluid at a first time;
- determine a temperature control signal corresponding to a target temperature of the fluid;
- perform feedforward control of the actuator based on a desired target temperature of the fluid with a feedforward control signal, the feedforward control signal configured to cause the actuator to control the fluid flow to increase or decrease the fluid temperature toward the target temperature of the fluid;
- receive a feedback control signal from the PID controller, the feedback control signal based on an error signal that corresponds to an additional change in the actuator position to control the fluid flow to cause the fluid temperature to increase or decrease to reduce a temperature difference between the temperature of the fluid at the first time and the desired target temperature, wherein the feedback control signal applies an I-term saturation limit calculated using a partial derivative term;
- and
- control the actuator based on a combination of the feedforward control signal and the feedback control signal.
8 more elements
A method for heating or cooling a fuel cell stack of a vehicle, comprising:
- providing a fuel cell stack having a plurality of fuel cells;
- providing an actuator having an actuator position and configured to control fluid flow to increase or decrease a fluid temperature of a fluid in the plurality of fuel cells;
- and
- providing an electronic control unit (ECU) coupled to the actuator, the ECU including a proportional-integral-derivative (PID) controller;
- with the ECU, determine a temperature of the fluid at a first time;
- with the ECU, determining a temperature control signal corresponding to a target temperature of the fluid;
- with the ECU, performing feedforward control of the actuator based on a desired target temperature of the fluid with a feedforward control signal, the feedforward control signal configured to cause the actuator to increase or decrease the fluid temperature toward the target temperature of the fluid;
- with the ECU, receiving a feedback control signal from the PID controller, the feedback control signal based on an error signal that corresponds to an additional change in the actuator position to control the fluid flow to cause the fluid temperature to increase or decrease to reduce a temperature difference between the temperature of the fluid at the first time and the desired target temperature, wherein the feedback control signal applies an I-term saturation limit calculated using a partial derivative term;
- and
- controlling the actuator based on a combination of the feedforward control signal and the feedback control signal.
7 more elements
A system for heating or cooling a fuel cell circuit of a vehicle comprising:
- a fuel cell stack having a plurality of fuel cells and configured to receive a fluid and to heat the fluid;
- an actuator having an actuator position and configured to control fluid flow to increase or decrease a fluid temperature of the fluid;
- and
- an electronic control unit (ECU) coupled to the actuator, the ECU configured to:
- determine a temperature of the fluid at a first time;
- determine a temperature control signal corresponding to a target temperature of the fluid;
- perform feedforward control of the actuator based on a desired target temperature of the fluid with a feedforward control signal, the feedforward control signal configured to cause the actuator to control the fluid flow to increase or decrease the fluid temperature towards the target temperature of the fluid;
- determine a temperature difference between the fluid temperature of the fluid and the target temperature of the fluid;
- determine a sensitivity that corresponds a change in a parameter value or the actuator position to a change in the fluid temperature;
- apply the sensitivity to the temperature difference to determine an error signal that corresponds to an additional change in the actuator position to control the fluid flow to cause the fluid temperature between the temperature of the fluid at the first time and the desired target temperature to increase or decrease to reduce the temperature difference;
- receive a feedback control signal from a PID controller, the feedback control signal based on the error signal, wherein the feedback control signal applies an I-term saturation limit calculated using a partial derivative term;
- and
- control the actuator based on the error signal.
10 more elements
Dependencies are inferred from the claim text.