Patent ID: 8126624
Filing Date: 2012-02-28
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. Method for controlling a powertrain system including an engine coupled to an input member of an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising: determining a current transmission operating range state and engine state; determining at least one potential transmission operating range state and engine state; optionally providing an operator torque request; defining a minimum value for an input speed to said transmission for each potential transmission operating range state; providing a plurality of proposed values for the input speed to said transmission for each potential transmission operating range state, each of said proposed values for the input speed also having associated with it a power input for said transmission, and a power loss; ascribing a biasing cost to each of those proposed values for the transmission input speeds which are lower than said minimum value defined for each potential transmission operating range state, wherein said biasing cost ascribed to each of those proposed values has a magnitude which is proportional to the difference between its rpm and the rpm of said minimum value for each potential transmission operating range state; selecting a single transmission input speed from said plurality of proposed values for each potential transmission operating range state; determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states; preferentially weighting the preferability factors for the current transmission operating range state and engine state; and selectively commanding changing the current transmission operating range state and engine state based upon said preferability factors and said single transmission input speed.