US 12,270,469 B2
Systems and methods for shifting multi-speed transmissions
Matthew W. Snyder, Fond du Lac, WI (US); and Justin R. Poirier, Fond du Lac, WI (US)
Assigned to Brunswick Corporation, Mettawa, IL (US)
Filed by Brunswick Corporation, Mettawa, IL (US)
Filed on Feb. 8, 2022, as Appl. No. 17/667,243.
Claims priority of provisional application 63/147,972, filed on Feb. 10, 2021.
Prior Publication US 2022/0252149 A1, Aug. 11, 2022
Int. Cl. F16H 61/682 (2006.01); B63H 21/21 (2006.01); B63H 23/02 (2006.01); B63H 23/06 (2006.01); F16H 59/40 (2006.01); F16H 59/74 (2006.01); F16H 61/12 (2010.01); F16H 61/16 (2006.01); F16H 61/684 (2006.01)
CPC F16H 61/682 (2013.01) [B63H 21/213 (2013.01); B63H 23/02 (2013.01); B63H 23/06 (2013.01); F16H 59/40 (2013.01); F16H 59/74 (2013.01); F16H 61/12 (2013.01); F16H 61/16 (2013.01); F16H 61/684 (2013.01); B63H 2023/0258 (2013.01); F16H 2059/743 (2013.01); F16H 2306/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for shifting a multi-speed transmission of a marine propulsion device between a first gear and a second gear each configured to transmit torque from a powerhead to a propulsor, wherein the powerhead has a redline RPM and the multi-speed transmission has a transition time for completing a shift, the method comprising:
measuring an RPM of the powerhead and comparing the RPM to a first RPM threshold;
starting a timer when the RPM exceeds the first RPM threshold, wherein the timer is reset when the RPM falls below the first RPM threshold;
measuring the RPM of the powerhead after the first RPM threshold is exceeded and comparing the RPM to a second RPM threshold that is different than the first RPM threshold;
stopping the timer when the RPM exceeds the second RPM threshold and determining an elapsed time between starting and stopping the timer;
determining a shift RPM based on the determined elapsed time, the redline RPM of the powerhead, and the transition time of the multi-speed transmission; and
controlling the multi-speed transmission to shift when the RPM measured for the powerhead reaches the shift RPM such that the shifting completes before the RPM of the powerhead reaches the redline RPM.