Internal-combustion engines – Engine speed regulator
Reexamination Certificate
2006-03-21
2006-03-21
Moulis, Thomas (Department: 3747)
Internal-combustion engines
Engine speed regulator
Reexamination Certificate
active
07013866
ABSTRACT:
A method for controlling airflow in an intake manifold of a multiple-displacement engine during an engine displacement mode transition includes determining, before a displacement mode transition, a post-transition mass air flow rate necessary to maintain a pre-transition engine torque output, as well as an airflow transient multiplier based on engine speed and an estimated post-transition manifold air pressure. After multiplying the requested mass air flow rate with the transient multiplier, the resulting compensated requested mass air flow rate is divided by a maximum mass air flow rate to obtain a requested percent airflow. The percent airflow is thereafter used with engine speed to determine a requested post-transition manifold air pressure-to-barometric pressure ratio, for example, using a lookup table; and the requested post-transition pressure ratio is used to determine a transient post-transition throttle position, to which an engine throttle will be moved upon initiating the displacement mode transition.
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Bonne Michael A
DiValentin Eugenio
Duty Mark J
Li Zhong
Ohl Gregory L
DaimlerChrysler Corporation
Moulis Thomas
Smith Ralph E.
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