System and method for trimming a trimmable marine device with respect to a marine vessel

Patent metadata

Field	Value
Publication number	US-9751605-B1
Application number	US-201615003326-A
Country	US
Kind code	B1
Filing date	Jan 21, 2016
Priority date	Dec 29, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A method for controlling a trim system on a marine vessel includes receiving an actual trim position of a trimmable marine device at a controller and determining a trim position error by comparing the actual trim position to a target trim position with the controller. The method also includes determining an acceleration rate of the marine vessel. In response to determining that the trim position error exceeds a first error threshold and the magnitude of the acceleration rate exceeds a given rate threshold, the controller commands the marine device to the target trim position. In response to determining that the trim position error exceeds the first error threshold and the acceleration rate does not exceed the given rate threshold, the controller commands the marine device to a setpoint trim position that is different from the target trim position. An associated system is also disclosed.

First claim

What is claimed is:

1. A method for controlling a trim system on a marine vessel, the method comprising:
receiving an actual trim position of a trimmable marine device at a controller;
determining a trim position error by comparing the actual trim position to a target trim position with the controller;
determining an acceleration rate of the marine vessel, wherein the acceleration rate has a magnitude;
in response to determining that the trim position error exceeds a first error threshold and the magnitude of the acceleration rate exceeds a given rate threshold, commanding the marine device to the target trim position with the controller;
in response to determining that the trim position error exceeds the first error threshold and the magnitude of the acceleration rate does not exceed the given rate threshold, commanding the marine device to a setpoint trim position that is different from the target trim position with the controller; and
trimming the marine device with a trim actuator in response to the controller commanding the marine device to one of the target trim position and the setpoint trim position.

2. The method of claim 1 , wherein commanding the marine device to the target trim position comprises commanding the trim actuator to move the marine device toward the target trim position until the controller determines that the actual trim position is equal to the target trim position.

3. The method of claim 2 , wherein commanding the marine device to the setpoint trim position comprises commanding the trim actuator to move the marine device toward the target trim position until the controller determines that the actual trim position is within a given range of the target trim position.

4. The method of claim 3 , wherein the given range is a calibrated value.

5. The method of claim 4 , wherein the given range has a magnitude that is inversely related to the magnitude of the acceleration rate of the marine vessel.

6. The method of claim 3 , further comprising setting the setpoint trim position to a value that is less than the target trim position when the acceleration rate is positive.

7. The method of claim 6 , further comprising setting the setpoint trim position to a value that is greater than the target trim position when the acceleration rate is negative.

8. The method of claim 1 , further comprising determining the target trim position with the controller based on vessel speed.

9. The method of claim 8 , wherein the trim system is a hydraulic trim system and the marine device is an outboard motor coupled to the marine vessel.

10. The method of claim 1 , further comprising comparing the trim position error to a second error threshold, and commanding the marine device to one of the target trim position and the setpoint trim position in response to the trim position error exceeding both the first error threshold and the second error threshold.

11. A system for controlling a trim position of a trimmable marine device with respect to a marine vessel to which the trimmable marine device is coupled, the system comprising:
a controller that determines a target trim position of the marine device based on a condition of the marine vessel;
a trim position sensor that senses an actual trim position of the marine device and sends actual trim position information to the controller; and
a trim actuator coupled to the marine device and configured to rotate the marine device about a horizontal trim axis in response to commands from the controller;
wherein the controller determines at least a magnitude of an acceleration rate of the marine vessel;
wherein, in response to determining that the magnitude of the acceleration rate exceeds a given rate threshold, the controller commands the trim actuator to rotate the marine device until the trim position sensor indicates that the actual trim position equals the target trim position; and
wherein, in response to determining that the magnitude of the acceleration rate does not exceed the given rate threshold, the controller commands the trim actuator to rotate the marine device until the trim position sensor indicates that the actual trim position equals a setpoint trim position that is different from the target trim position.

12. The system of claim 11 , wherein the setpoint trim position is within a given range of the target trim position.

13. The system of claim 12 , wherein the given range has a magnitude that is inversely related to the magnitude of the acceleration rate of the marine vessel.

14. The system of claim 12 , wherein the trim actuator comprises:
a hydraulic pump-motor combination;
a piston-cylinder assembly having a first end coupled to the marine vessel and a second end movable with respect to the first end and coupled to the marine device;
a first hydraulic line coupling the pump-motor combination to a first chamber at the first end of the piston-cylinder; and
a second hydraulic line coupling the pump-motor combination to a second chamber at the second end of the piston-cylinder.

15. The system of claim 14 , wherein the given range is a calibrated value that depends on one or more of a time it takes a valve between the pump-motor combination and the piston-cylinder assembly to close, an amount of expansion of the first and second hydraulic lines, and inertia of the pump-motor combination.

16. The system of claim 15 , further comprising a look-up table stored in a memory of the controller and containing a plurality of calibrated values for the given range, each calibrated value in the plurality of calibrated values being related to a given acceleration rate of the marine vessel.

17. The system of claim 16 , wherein when a particular acceleration rate of the marine vessel is not in the look-up table, the controller interpolates the given range using a first calibrated value associated with an acceleration rate that is greater than the particular acceleration rate and a second calibrated value associated with an acceleration rate that is less than the particular acceleration rate.

18. The system of claim 11 , wherein the controller determines a trim position error by comparing the actual trim position to the target trim position and commands the trim actuator to rotate the marine device to one of the target trim position and the setpoint trim position only if the trim position error exceeds an error threshold.

19. The system of claim 11 , wherein the marine device is an outboard motor.

20. The system of claim 11 , wherein the given rate threshold has a different magnitude when the acceleration rate of the marine vessel is positive than when the acceleration rate of the marine vessel is negative.

Assignees

• Brunswick Corp

Inventors

• Anschuetz Steven M
• Andrasko Steven J
• Przybyl Andrew J

Classifications

• B63H20/10 Primary

  Means enabling trim or tilt, or lifting of the propulsion element when an obstruction is hit; Control of trim or tilt · CPC title

• B63H21/21

  Control means for engine or transmission, specially adapted for use on marine vessels · CPC title

• Y02T70/50

  Measures to reduce greenhouse gas emissions related to the propulsion system · CPC title