Method for operating an internal combustion engine, and control device

A method for operating an internal combustion engine, comprising:

• providing an internal combustion engine having:
• a crankshaft configured to be driven by a piston of a cylinder,
• an intake manifold configured to supply fresh air to the cylinder,
• an inlet valve configured to open so that fresh air can flow from the intake manifold into the cylinder, and
• a variable valve drive configured to vary an opening duration or a timing of the inlet valve relative to a position of the crankshaft,
• operating the internal combustion engine in an overrun phase during which:
• i) the internal combustion engine is dragged without fuel being supplied, and ii) a first inlet valve timing set by the variable valve drive provides a reduced or no air mass flow in the cylinder,
• requesting a refiring of the internal combustion engine,
• comparing an intake manifold pressure to an intake manifold desired pressure,
• determining, based on the comparison, a rate of adjusting the timing of the inlet valve to enable a pre-filling control of fresh air into the cylinder, and
• refiring the internal combustion engine, and
• wherein:
• a first comparison corresponds to:
• i) a first difference between the intake manifold pressure and the intake manifold desired pressure, and ii) a first rate of adjusting the timing of the inlet valve,
• a second comparison corresponds to:
• i) a second difference between the intake manifold pressure and the intake manifold desired pressure, and ii) a second rate of adjusting the timing of the inlet valve, and
• the second difference is greater than the first difference, and the second rate is slower than the first rate.

A method for operating an internal combustion engine, comprising:

• providing an internal combustion engine having:
• a crankshaft configured to be driven by a piston of a cylinder,
• an intake manifold configured to supply fresh air to the cylinder,
• an inlet valve configured to open so that fresh air can flow from the intake manifold into the cylinder, and
• a variable valve drive configured to vary an opening duration or a timing of the inlet valve relative to a position of the crankshaft, and
• operating the internal combustion engine in an overrun phase during which:
• i) the internal combustion engine is dragged without fuel supply via an inertia of a motor vehicle, and ii) a first inlet valve timing set by the variable valve drive provides a reduced or no air mass flow in the cylinder,
• requesting a refiring of the internal combustion engine,
• comparing an intake manifold pressure to an intake manifold desired pressure,
• determining, based on the comparison, a rate of adjusting the timing of the inlet valve to enable pre-filling control of fresh air into the cylinder,
• adjusting the timing of the inlet valve via the determined rate to allow a controlled amount of fresh air in the cylinder, and
• refiring the internal combustion engine.