Method and apparatus for controlling a multi-mode powertrain system
AssigneeGM Global Technology Operations LLC
InventorsAnthony H. Heap, Wilfried Brunssen, Poh Fong Chin
Life of this patent
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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.
Claims15
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:
- executing a deceleration fuel cutoff state, the executing comprising:
- stopping fuel flow to the engine;
- and
- operating a deceleration fuel cutoff state pumping loss reduction mode comprising opening an air throttle to a fully open position to reduce engine pumping losses during the deceleration fuel cutoff state;
- exiting the deceleration fuel cutoff state, the exiting comprising, prior to restoring the fuel flow to the engine, operating an engine intake manifold pump down mode comprising closing the air throttle to reduce an air intake manifold pressure and reduce an engine torque realized upon engagement of the engine once the fuel flow is restored.
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:
- executing a deceleration fuel cutoff state, the executing comprising:
- stopping fuel flow to the engine;
- and
- operating a deceleration fuel cutoff state pumping loss reduction mode comprising opening an air throttle to a fully open position to reduce engine pumping losses during the deceleration fuel cutoff state;
- exiting the deceleration fuel cutoff state, the exiting comprising, prior to restoring the fuel flow to the engine, selectively operating an engine intake manifold pump down mode comprising closing the air throttle to reduce an air intake manifold pressure and reduce an engine torque realized upon engagement of the engine once the fuel flow is restored, the selective operation being provided by programmed pump down mode abort logic;
- and
- restoring the fuel flow to the engine.
Dependencies are inferred from the claim text.