Reversing method for a vehicle powertrain
AssigneeSchaeffler Technologies AG & Co. KG
InventorsJeffrey Mossberg, Andrew Mlinaric
Life of this patent
Estimating the term…
Abstract
A method for moving a vehicle in a reverse direction is provided. The method includes: providing an internal combustion engine, a transmission, and an electric machine; adjusting a valve timing of either an intake valve or an exhaust valve during a non-firing mode of the internal combustion engine to reduce a rotational resistance; and, rotating the internal combustion in a backwards or reverse direction so that the vehicle moves in a reverse direction.
Claims19
A method of operating an internal combustion engine operating according to a four-stroke combustion cycle to move a vehicle in a reverse direction, the internal combustion engine having a combustion chamber defined by an intake valve, an exhaust valve, and a piston, the method comprising:
- rotating the internal combustion engine in a first rotational direction via combustion events occurring within the combustion chamber via:
- i) a first intake valve timing of the intake valve relative to a firing engine combustion cycle, and ii) a first exhaust valve timing of the exhaust valve relative to the firing engine combustion cycle;
- commencing shutdown of the internal combustion engine;
- adjusting at least one of:
- an intake valve timing from the first intake valve timing to a second intake valve timing relative to the firing engine combustion cycle so as to decrease a rotational resistance of the internal combustion engine;
- or
- an exhaust valve timing from the first exhaust valve timing to a second exhaust valve timing relative to the firing engine combustion cycle so as to decrease a rotational resistance of the internal combustion engine;
- and
- rotating the internal combustion engine in a second rotational direction via an electric machine so that the vehicle moves in a reverse direction.
A method for moving a vehicle in a reverse direction, the method comprising:
- providing a vehicle with a powertrain comprising:
- an internal combustion engine operating according to a four-stroke combustion cycle having a piston configured to reciprocate within an engine cylinder so as to define a combustion cycle within a combustion chamber formed by the piston and the engine cylinder;
- and the internal combustion engine is configured to rotate in a first rotational direction via combustion events within the combustion chamber;
- and
- a transmission configured to be driven by the internal combustion engine and deliver at least one of an adjusted speed or an adjusted torque of the internal combustion engine to a propulsion interface element of the vehicle;
- and when the internal combustion engine rotates in the first rotational direction, the vehicle moves in a forward direction;
- and
- decompressing the internal combustion engine such that the combustion chamber is continuously vented throughout a duration of each upward stroke of the piston within the engine cylinder from a bottom dead center position to a top dead center position;
- and
- rotating the internal combustion engine in a second rotational direction via an electric machine so that the vehicle moves in a reverse direction.
A method for moving a vehicle in a reverse direction, the method comprising:
- providing a vehicle with a powertrain comprising:
- an internal combustion engine operating according to a four-stroke combustion cycle defined by a reciprocating piston within an engine cylinder, and an intake valve and an exhaust valve configured to respectively control a flow of gases in and out a combustion chamber formed by the reciprocating piston and the engine cylinder;
- and the internal combustion engine is configured to rotate in a first rotational direction via combustion events within the combustion chamber;
- and
- a transmission configured to be driven by the internal combustion engine and deliver at least one of an adjusted speed or an adjusted torque of the internal combustion engine to a propulsion interface element of the vehicle;
- and
- adjusting at least one of an intake valve timing or an exhaust valve timing via an electric camshaft phaser when the internal combustion engine is in a non-firing mode so as to reduce a rotational resistance of the internal combustion engine;
- and
- rotating the internal combustion engine in a second rotational direction via an electric machine so that the vehicle moves in a reverse direction.
Dependencies are inferred from the claim text.