Method and apparatus for controlling a multi-mode powertrain system
AssigneeGM Global Technology Operations LLC
InventorsANTHONY H. HEAP, WILFRIED BRUNSSEN, POH FONG CHIN
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Abstract
A multi-mode powertrain system includes a transmission configured to transfer torque among an internal combustion engine, torque machines and an output member. A method for controlling the powertrain system includes operating the multi-mode powertrain system to execute an engine intake manifold pump down mode, and aborting the engine intake manifold pump down mode and fueling the engine, wherein aborting is based upon intake manifold pressure and system constraints.
Claims18
A method for controlling a multi-mode powertrain system including a transmission configured to transfer torque among an internal combustion engine, torque machines and an output member, the method comprising:
- operating the multi-mode powertrain system to execute an engine intake manifold pump down mode;
- and
- aborting the engine intake manifold pump down mode and fueling the engine, said aborting based upon intake manifold pressure and system constraints.
A method for controlling a multi-mode powertrain system including a transmission configured to transfer torque among an internal combustion engine, torque machines and an output member, the method comprising:
- in response to a command to discontinue operating the multi-mode powertrain system in a pumping loss reduction (DPLR) mode associated with a deceleration fuel cutoff (dFCO) mode:
- executing an intake manifold pump down coincident with operating the engine in the dFCO mode;
- and
- refueling the engine when intake manifold pressure is pumped down sufficiently.
A method for controlling a multi-mode powertrain system including a transmission configured to transfer torque among an internal combustion engine, a torque machine and an output member, the method comprising:
- establishing a deceleration fuel cutoff state including operating the engine in a pumping loss reduction mode;
- and
- in response to a change in an output torque request, controlling the torque machine to effect intake manifold pump down coordinated with executing an engine refueling operation to fuel and fire the engine, wherein controlling the torque machine to effect engine pump down is based upon electric power flow to the torque machine and the output torque request.
Dependencies are inferred from the claim text.