Method and system for vehicle propulsion system control
OwnerDalton A Blenc, Aaron Bowlesinventors
Life of this patent
Estimating the term…
Abstract
A vehicle propulsion system includes an internal combustion engine with a cylinder, an intake valve, an exhaust valve, and a cylinder head defining a combustion chamber; an intake manifold in communication with the combustion chamber through the intake valve; an exhaust manifold in communication with the combustion chamber through the exhaust valve; a turbocharger with a compressor in communication with the intake manifold, a turbine in communication with the exhaust manifold, and an electric motor for selectively driving the turbine; and a controller in communication with the electric motor and configured to selectively operate electric motor to drive the turbine to reduce a pressure in the combustion chamber during an engine start process.
Claims7
A vehicle propulsion system comprising:
- an internal combustion engine with a cylinder, an intake valve, an exhaust valve, and a cylinder head defining a combustion chamber;
- an intake manifold in communication with the combustion chamber through the intake valve;
- an exhaust manifold in communication with the combustion chamber through the exhaust valve;
- a turbocharger with a compressor in communication with the intake manifold, a turbine in communication with the exhaust manifold, and an electric motor for selectively driving the turbine;
- and
- a controller in communication with the electric motor and configured to selectively operate the electric motor to drive the turbine, close the intake valve, and open the exhaust valve, for a predetermined period of time before a belt alternator/starter system applies a force that initiates motion of a piston in the engine to reduce a pressure in the combustion chamber during an engine start process.
A method for controlling a vehicle propulsion system that includes:
- an internal combustion engine with a cylinder, an intake valve, an exhaust valve, and a cylinder head defining a combustion chamber;
- an intake manifold in communication with the combustion chamber through the intake valve;
- an exhaust manifold in communication with the combustion chamber through the exhaust valve;
- a turbocharger with a compressor in communication with the intake manifold, a turbine in communication with the exhaust manifold, and an electric motor for selectively driving the turbine;
- and
- a controller in communication with the electric motor and configured to selectively operate the electric motor to drive the turbine, the method comprising selectively operating the electric motor to drive the turbine to reduce a pressure in the combustion chamber during the engine start process closing the intake valve, and opening the exhaust valve, for a predetermined period of time before a belt alternator/starter system applies a force that initiates motion of a piston in the engine to reduce a pressure in the combustion chamber during an engine start process.
Dependencies are inferred from the claim text.