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Deceleration cylinder cut-off in a hybrid vehicle

  • US 10,167,799 B2
  • Filed: 05/02/2017
  • Issued: 01/01/2019
  • Est. Priority Date: 07/31/2012
  • Status: Active Grant
First Claim
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1. A method of operating a vehicle having a drive train, an electric motor/generator and an engine, the engine having a crankshaft, an intake manifold and a plurality of working chamber, and wherein the electric motor/generator and engine cannot independently mechanically engage with the drive train, the method comprising:

  • while the engine is operating with the crankshaft rotating in a first direction, deactivating all the working chambers in response to a no engine torque request such that none of the working chambers are fired and no air is pumped through the working chambers as the crankshaft continues to rotate in the first direction through multiple engine cycles with the working chambers deactivated;

    disengaging the engine from the drive train so that the vehicle motion and crankshaft rotation are not mechanically coupled during at least a portion of the time in which all of the working chambers are deactivated, whereby the electric motor/generator is disengaged from the drive train when the engine is disengaged from the drive train; and

    allowing the crankshaft rotation rate to drop below a shift speed for multiple engine cycles while the engine is disengaged from the drive train with all of the working chambers deactivated.

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