Method of controlling engine stop-start operation for heavy-duty hybrid-electric and hybrid-hydraulic vehicles
AssigneeIse Corporation
InventorBrian D. Moran
Life of this patent
Estimating the term…
Abstract
This invention relates to a Start-Stop method for a heavy-duty hybrid vehicle that turns off the internal combustion engine when the vehicle stops or, optionally, when the vehicle travels downhill. The Stop-Start method automatically restarts the internal combustion engine when the vehicle starts accelerating or is no longer traveling downhill. The software instructions for the Stop-Start method reside within the programming of the hybrid vehicle control computer as a subset of the hybrid vehicle control strategy in hybrid-electric or hybrid-hydraulic heavy-duty vehicle. During the time the internal combustion engine is turned off the necessary vehicle accessories operate from the available power of the hybrid high power energy storage.
Claims24
A method for efficiently controlling an engine of a heavy-duty hybrid-electric vehicle of at least 10,000 pounds Gross Vehicle Weight Rating (GVWR) traveling in a direction, the heavy-duty hybrid-electric vehicle having a generator, an inverter, a propulsion motor, a first energy storage, and a control computer, the method comprising:
- enabling a function comprising an automatic engine turnoff function;
- determining a first energy storage first State Of Charge;
- determining a first vehicle propulsion power requirement associated with the direction of travel of the heavy-duty hybrid-electric vehicle;
- turning off the engine if the first energy storage first State Of Charge is above a first energy storage first State Of Charge minimum threshold and the first vehicle propulsion requirement associated with the direction of travel of the heavy-duty hybrid-electric vehicle is below a first vehicle propulsion requirement minimum threshold;
- and,
- commanding the generator to spin the engine to drive at least one Power Take-Off accessory.
A method for efficiently controlling an engine of a heavy-duty hybrid-hydraulic vehicle having a first energy storage, the method comprising:
- enabling a function comprising an automatic engine turnoff function;
- determining a first energy storage first State Of Charge;
- determining a first vehicle propulsion power requirement associated with the direction of travel of the heavy-duty hybrid-electric vehicle;
- turning off the engine if the first energy storage first State Of Charge is above a first energy storage first State Of Charge minimum threshold and the first vehicle propulsion requirement is below a first vehicle propulsion requirement minimum threshold;
- determining a first energy storage second State Of Charge;
- determining a second vehicle propulsion power requirement;
- restarting the engine if the first energy storage second State Of Charge is below a first energy storage second State Of Charge minimum threshold or if the second vehicle propulsion requirement is above a second vehicle propulsion requirement minimum threshold;
- and,
- commanding the generator to spin the engine to drive at least one Power Take-Off accessory.
Dependencies are inferred from the claim text.