System and method to improve engine response during hybrid power generation

Patent metadata

Field	Value
Publication number	US-10270248-B2
Application number	US-201414502288-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A hybrid energy system including a controller that is coupled to at least one generator set and to at least one energy storage device. The controller is configured to cause the at least one generator set to operate at a first operational speed and a second operational speed in response to a change in the load. The controller receives notice that the at least one energy storage device is providing energy to the load and, in response thereto, to changes the amount of energy that the at least one generator set is providing to the load by causing the at least one generator set to operate at a third operational speed.

First claim

We claim:

1. A hybrid energy system, comprising:
at least one generator set;
at least one energy storage device; and
a controller coupled to the at least one generator set and the at least one energy storage device, the controller being configured
to cause the at least one generator set to operate at a first operational speed;
to cause the at least one generator set to operate at a second operational speed in response to a change in a load;
to receive a first indication comprising a notification that the at least one energy storage device is providing energy to the load and, in response to the first indication, to increase a first amount of energy that the at least one generator set is providing to the load by causing the at least one generator set to operate at a third operational speed;
to receive a second indication that a second amount of energy that the energy storage device is providing to the load is decreasing; and
to control the at least one generator set to decrease the first amount of energy that it is providing to the load in response to receiving the second indication.

2. The hybrid energy system of claim 1 , wherein the controller is configured to control the at least one generator set to increase the first amount of energy that the at least one generator set is providing to the load by causing the third operational speed to be greater than the second operational speed.

3. The hybrid energy system of claim 2 , wherein the controller is configured to receive the second indication comprising a notification that the at least one energy storage device is providing less energy to the load than upon receipt of the first indication.

4. The hybrid energy system of claim 3 , wherein the controller is configured to control the at least one generator set to operate at the second operational speed in response to the second indication.

5. The hybrid energy system of claim 3 , wherein the controller is configured to control the at least one generator set to operate at a fourth operational speed that is less than the third operational speed but greater than the second operational speed in response to the second indication.

6. The hybrid energy system of claim 1 , wherein the at least one generator set comprises a plurality of generator sets.

7. The hybrid energy system of claim 6 , wherein the controller is configured to adjust an operational speed of each of the plurality of generator sets in response to the first indication.

8. The hybrid energy system of claim 6 , wherein the controller is configured to adjust an operational speed of a subset of the plurality of generator sets in response to the first indication.

9. A method of operating a hybrid energy system including at least one generator set and an energy storage device that are configured to provide energy to a load, the method comprising:
causing the at least one generator set to operate at a first operational speed;
causing the at least one generator set to operate at a second operational speed in response to a change in the load;
receiving a first indication comprising a notification that the energy storage device is engaged in energy transfer with the load;
causing the at least one generator set to operate at a third operational speed in response to the first indication;
receiving a second indication comprising a notification that the energy storage device is providing less energy to the load than upon receipt of the first indication; and
causing the at least one generator set to operate at a fourth operational speed that is greater than the second operational speed and less than the third operational speed in response to the second indication.

10. The method of claim 9 , wherein the step of receiving the first indication comprises:
receiving a notification that the energy storage device is providing energy to the load.

11. The method of claim 10 , wherein the fourth operational speed is less than the third operational speed in proportion to a difference between an amount of energy the energy storage device is providing to the load upon receipt of the first indication and an amount of energy that the energy storage device is providing to the load upon receipt of the notification that the energy storage device is providing less energy to the load than upon receipt of the first indication.

12. The method of claim 10 , wherein the step of receiving the first indication comprises:
receiving a notification that the energy storage device is receiving energy from the load.

13. The method of claim 12 , wherein the third operational speed is less than the second operational speed.

14. A method of controlling a hybrid energy system that is driving a load, the method comprising:
causing the hybrid energy system to operate in a first operational mode in which at least one generator set operates at a first operational speed;
causing the hybrid energy system to operate in a second operational mode in which the at least one generator set operates at a second operational speed in response to a change in the load;
determining whether or not to enter into a third operational mode of the hybrid energy system in response to receipt of an indication by comparing an amount of energy provided by an energy storage device to at least one threshold amount of energy;
receiving a first indication that there has been a change in energy transfer between the energy storage device and the load;
causing the hybrid energy system to operate in the third operational mode in which the at least one generator set operates at a third operational speed in response to the first indication;
receiving a second indication comprising a notification that the energy storage device is providing less energy to the load than upon receipt of the first indication; and
causing the hybrid energy system to operate in a fourth operational mode in which the at least one generator set operates at a fourth operational speed that is greater than the second operational speed and less than the third operational speed in response to the second indication.

15. The method of claim 14 , wherein the step of receiving comprises:
receiving a notification that the energy storage device is providing energy to the load.

16. The method of claim 15 , wherein the step of determining comprises:
calculating the amount of energy that the energy storage device is providing to the load;
comparing the amount of energy to the at least one threshold amount of energy;
causing the hybrid energy system to enter the third operational mode in response to the amount of energy exceeding the at least one threshold value.

17. The method of claim 16 , wherein the at least one threshold value comprises a lower threshold value and an upper threshold value defining a range, and wherein the step of causing the system to enter the third operational mode comprises:
entering the third operational mode if the amount of energy is within the range.

18. The method of claim 17 , further comprising:
receiving an indication that the amount of energy that the energy storage device is providing to the load is decreasing; and
controlling the at least one generator set to decrease the amount of energy that it is providing to the load in response to receiving the indication that the amount of energy that the energy storage device is providing to the load is decreasing.

Assignees

• Caterpillar Inc

Inventors

• Janardhan Vijay
• Converse Perry

Classifications

• H02J1/14 Primary

  Balancing load and power generation in DC networks · CPC title

• B60W2050/0062

  Adapting control system settings · CPC title

• B60W50/00 Primary

  Details of control systems for road vehicle drive control not related to the control of a particular sub-unit {, e.g. process diagnostic or vehicle driver interfaces} · CPC title

• H02J2105/30

  the load networks being external to vehicles, i.e. exchanging power with vehicles · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title