Hybrid driveline control

Abstract

A computer system has processing circuitry to obtain a wanted speed of a marine vessel comprising a combustion propulsion source and an electric propulsion source for propelling the marine vessel, obtain a current speed and a planing speed threshold of the marine vessel, responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold, control the combustion propulsion source to provide a majority of a propulsion torque of the marine vessel.

What is claimed is: 
     
         1 . A computer system comprising processing circuitry configured to: 
 obtain a wanted speed of a marine vessel comprising a combustion propulsion source and an electric propulsion source for propelling the marine vessel;   obtain a current speed and a planing speed threshold of the marine vessel,   responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold:    control the combustion propulsion source to provide a majority of a propulsion torque of the marine vessel.   
     
     
         2 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: 
 obtain the planing speed threshold based on a predetermined planing speed threshold.   
     
     
         3 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: 
 monitor a change in speed versus a change in driveline power as a power derivate or a torque derivate, and   obtain the planing speed threshold based on a speed at which the power derivate or the torque derivate is above a derivate threshold.   
     
     
         4 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: 
 responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold:    control the combustion propulsion source to provide all of a propulsion torque of the marine vessel.   
     
     
         5 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: 
 responsive to the wanted speed being below the planing speed threshold: 
 control the electric propulsion source to provide a majority of the propulsion torque of the marine vessel. 
   
     
     
         6 . The computer system of  claim 5 , wherein the processing circuitry is further configured to: responsive to the wanted speed being below the planing speed threshold: control the electric propulsion source to provide all of the propulsion torque of the marine vessel. 
     
     
         7 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: responsive to the wanted speed being above the planing speed threshold and the current speed being a predetermined value below the planing speed threshold: start the combustion propulsion source and/or accelerate the combustion propulsion source to the planing speed threshold. 
     
     
         8 . The computer system of  claim 1 , wherein the processing circuitry is configured to obtain the wanted speed based on an indication provided by an operator controlled throttle of the marine vessel. 
     
     
         9 . The computer system of  claim 1 , wherein the processing circuitry is configured to obtain the current speed and/or the planing speed threshold based on a corresponding driveline power of the marine vessel. 
     
     
         10 . The computer system of  claim 1 , wherein the processing circuitry is further configured to: 
 obtain the planing speed threshold based on a predetermined planing speed threshold,   obtain the wanted speed based on an indication provided by an operator controlled throttle of the marine vessel,   obtain the current speed and/or the planing speed threshold based on a corresponding driveline power of the marine vessel,   monitor a change in speed versus a change in driveline power as a power derivate,   obtain the planing speed threshold based on a speed at which the power derivate is above a derivate threshold, and   responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold: 
 control the combustion propulsion source to provide all of a propulsion torque of the marine vessel, and 
 responsive to the wanted speed being below the planing speed threshold: 
 control the electric propulsion source to provide all of the propulsion torque of the marine vessel. 
 
   
     
     
         11 . A hybrid driveline for a marine vessel comprising an electric propulsion source and a combustion propulsion source connected to a propeller shaft of the hybrid driveline, and the computer system of  claim 1 . 
     
     
         12 . The hybrid driveline of  claim 11 , wherein the electric propulsion source is connected to the propeller shaft by a freewheel gear. 
     
     
         13 . The hybrid driveline of  claim 12 , wherein the electric propulsion source and the combustion propulsion source are connected to the propeller shaft at separate sides of the freewheel gear. 
     
     
         14 . A marine vessel comprising the hybrid driveline of  claim 11 . 
     
     
         15 . A computer implemented method comprising: 
 obtaining, by processing circuitry of a computer system, a wanted speed of a marine vessel comprising a combustion propulsion source and an electric propulsion source for propelling the marine vessel;   obtaining, by the processing circuitry, a current speed and a planing speed threshold of the marine vessel,   responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold:    controlling, by the processing circuitry, the combustion propulsion source to provide a majority of a propulsion torque of the marine vessel.   
     
     
         16 . The computer implemented method of  claim 15 , further comprising: 
 obtaining, by the processing circuitry, the planing speed threshold based on a predetermined planing speed threshold.   
     
     
         17 . The computer implemented method of  claim 15 , further comprising: 
 monitoring, by the processing circuitry, a change in speed versus a change in driveline power as a power derivate or a torque derivate, and   obtaining, by the processing circuitry, the planing speed threshold based on a speed at which the power derivate or the torque derivate is above a derivate threshold.   
     
     
         18 . The computer implemented method of  claim 15 , further comprising: 
 responsive to the wanted speed being above the planing speed threshold and the current speed being at the planing speed threshold:    controlling, by the processing circuitry, the combustion propulsion source to provide all of a propulsion torque of the marine vessel.   
     
     
         19 . A computer program product comprising program code for performing, when executed by processing circuitry, the method of  claim 15 .  
     
     
         20 . A non-transitory computer-readable storage medium comprising instructions, which when executed by processing circuitry, cause the processing circuitry to perform the method of  claim 15 .