Engine speed secondary anti-windup PID controller for an automotive productivity manager

1. A method for maintaining an engine speed of an engine of a work vehicle, comprising:

sending a requested parameter indicative of the engine speed to an engine controller of the work vehicle;

receiving a measured parameter indicative of the engine speed;

determining whether the requested parameter is different from the measured parameter;

in response to determining that the requested parameter is different from the measured parameter, determining whether a load on the engine exceeds a threshold value based on a desired load of the engine;

in response to determining that the load on the engine exceeds the threshold value, setting a controller-requested parameter indicative of the engine speed to a difference between the requested parameter and the measured parameter multiplied by a proportional gain;

in response to determining that the load on the engine does not exceed the threshold value, setting the controller-requested parameter to a sum of:

the difference between the requested parameter and the measured parameter multiplied by the proportional gain;

an integral of the difference multiplied by an integral gain; and

a differentiation of the difference multiplied by a differential gain; and

sending the controller-requested parameter to the engine controller, wherein the engine controller outputs a signal to adjust a throttle of the engine in response to receiving the controller-requested parameter.

2. The method of claim 1 , wherein the requested parameter is requested by an operator of the work vehicle.

3. The method of claim 1 , wherein the controller-requested parameter is requested by an automotive productivity manager (APM) of a controller of the work vehicle.

4. The method of claim 1 , wherein the desired load of the engine comprises a maximum load of the engine.

5. The method of claim 1 , wherein the threshold value is approximately 95 percent of a maximum load of the engine.

6. The method of claim 1 , wherein sending the controller-requested parameter to the engine controller comprises multiplying a feedback signal of a difference between the controller-requested parameter before and after saturation by a gain.

7. A system of a work vehicle, comprising:

an engine;

a controller comprising an engine controller communicatively coupled to the engine, wherein the controller, in operation:

sends a requested parameter indicative of engine speed to the engine controller;

receives a measured parameter indicative of engine speed;

determines whether a load on the engine exceeds a threshold value based on a desired load of the engine;

in response to determining that the load on the engine does not exceed the threshold value, sets a controller-requested parameter indicative of engine speed to a sum of:

a difference between the requested parameter and the measured parameter multiplied by a proportional gain;

an integral of the difference multiplied by an integral gain; and

a differentiation of the difference multiplied by a differential gain; and

sends the controller-requested parameter to the engine controller.

8. The system of claim 7 , wherein the controller comprises a proportional-integral-differential (PID) controller, wherein the PID controller comprises an automotive productivity manager (APM).

9. The system of claim 8 , wherein the APM, in operation, reduces fuel consumption of the work vehicle.

10. The system of claim 8 , wherein the APM, in operation, sends the controller-requested parameter to an engine controller of the controller based on the controller-requested parameter, a first desired engine speed, and second desired engine speed.

11. The system of claim 10 , wherein the APM, in operation, sends the controller-requested parameter to an engine controller of the controller when an engine speed based on the controller-requested parameter is less than or equal to the first desired engine speed and greater than or equal to the second desired engine speed.

12. The system of claim 11 , wherein the first desired engine speed comprises a maximum engine speed.

13. The system of claim 11 , wherein the second desired engine speed comprises a minimum engine speed.

14. The system of claim 8 , wherein the measured parameter is provided by a sensor communicatively coupled to a shaft of the engine.

15. A controller of a work vehicle, comprising:

an engine controller communicatively coupled to an engine of the work vehicle;

a processor communicatively coupled to the engine controller, wherein the controller, in operation:

determines whether a requested parameter indicative of engine speed is different from a measured parameter indicative of engine speed;

in response to determining that the requested parameter is different from the measured parameter, determines whether a load on the engine exceeds a threshold value based on a desired load of the engine;

in response to determining that the load on the engine exceeds the threshold value, sets a controller-requested parameter indicative of engine speed to a difference between the requested parameter and the measured parameter multiplied by a proportional gain; and

sends the controller-requested parameter to the engine controller, wherein the engine controller outputs a signal to adjust a throttle of the engine in response to receiving the controller-requested parameter.

16. The controller of claim 15 , wherein sending the controller-requested parameter to the engine controller comprises multiplying a feedback signal of a difference between the controller-requested parameter before and after saturation by a gain in order to avoid windup from an engine speed saturation.

17. The controller of claim 15 comprising an integrator.

18. The controller of claim 17 comprising a zero switch, wherein setting the controller-requested parameter comprises using the zero switch to pass a difference between the requested parameter and the measured parameter to the integrator.

19. The method of claim 1 , wherein an input to the integral of the difference is set to zero.