METHOD FOR CONTROLLING ENGINE STARTS FOR A VEHICLE POWERTRAIN
First Claim
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1. A method for controlling starting of an internal combustion engine in a powertrain for an automotive vehicle, the engine having an air intake manifold controlled by an engine throttle, the method comprising the steps of:
- scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of torque command during an engine running mode; and
increasing the throttle opening during the engine cranking mode by adding to the engine cranking throttle position an adder value as a function of commanded engine power during the engine running mode, whereby a delay in a response to the driver demand for engine power is reduced.
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Abstract
A method is disclosed for controlling an internal combustion engine in a vehicle powertrain. A filtered driver demand for torque at vehicle traction wheels is used to determine an engine torque command. The engine torque command is initialized to a percentage of a target engine torque as a function of variables that may include a smoothness factor.
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Citations
14 Claims
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1. A method for controlling starting of an internal combustion engine in a powertrain for an automotive vehicle, the engine having an air intake manifold controlled by an engine throttle, the method comprising the steps of:
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scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of torque command during an engine running mode; and
increasing the throttle opening during the engine cranking mode by adding to the engine cranking throttle position an adder value as a function of commanded engine power during the engine running mode, whereby a delay in a response to the driver demand for engine power is reduced. - View Dependent Claims (4, 9)
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2. A method for controlling starting of an internal combustion engine in a powertrain for an automotive vehicle, the engine having an air intake manifold controlled by an engine throttle, the method comprising the steps of:
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scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of commanded engine torque during an engine running mode; and
increasing the engine cranking throttle position whereby air intake manifold pressure during the engine cranking mode is increased. - View Dependent Claims (5, 7)
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3. A method for controlling starting of an internal combustion engine in a powertrain for an automotive vehicle, the engine having an air intake controlled by an engine throttle, the method comprising the steps of:
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scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of commanded engine torque during an engine running mode; and
increasing the engine cranking throttle position further in advance of the engine running mode by adding to the engine cranking throttle position an adder value as a function of engine power requested by the driver during the engine running mode. - View Dependent Claims (6, 8)
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10. A method for controlling a hybrid electric vehicle powertrain comprising a throttle-controlled internal combustion engine, at least one electric traction motor-generator, a battery and transmission gearing establishing plural power delivery paths from the engine and the motor-generator to vehicle traction wheels, the engine having an air intake manifold controlled by an engine throttle, the method comprising the steps of:
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scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of torque command during an engine running mode; and
increasing the throttle opening during the engine cranking mode by adding to the engine cranking throttle position an adder value as a function of commanded engine power during the engine running mode, whereby a delay in a response to the driver demand for engine power is reduced.
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11. A method for controlling a hybrid electric vehicle powertrain comprising a throttle-controlled internal combustion engine, at least one electric traction motor-generator, a battery and transmission gearing establishing plural power delivery paths from the engine and the motor-generator to vehicle traction wheels, the engine having an air intake manifold controlled by an engine throttle, the method comprising the steps of:
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scheduling an engine cranking throttle position to accommodate a manifold air intake flow required for a low power demand during an engine cranking mode;
scheduling a time-based advanced throttle position as a function of commanded engine torque during an engine running mode; and
increasing the engine cranking throttle position during the engine cranking mode whereby air intake manifold pressure during the engine cranking mode is increased. - View Dependent Claims (12, 13, 14)
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Specification