Valve actuation control apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakashi Kawasaki, Naohide Fuwa
Life of this patent
Estimating the term…
Abstract
After a delay control for extending a period from when an engine stop request is made to when the engine actually stops is started, the electronic control unit changes the valve timing and the valve duration of an intake valve to valve timing and valve duration suitable for starting the engine. When changing the valve timing and the valve duration after the start of the delay control, the electronic control unit changes one of the valve timing and the valve duration of the intake valve based on the other such a valve overlap becomes less than or equal to a predetermined value.
Claims7
A valve actuation control apparatus for an internal combustion engine, the engine having a variable valve timing mechanism that changes valve timing of an engine valve and a variable valve duration mechanism that changes valve duration of the engine valve, the apparatus comprising a control section that controls the variable valve timing mechanism and the variable valve duration mechanism, wherein, after a delay control for extending a period from when an engine stop request is made to when the engine actually stops is started, the control section changes the valve timing and the valve duration to valve timing and valve duration suitable for starting the engine, and wherein, when changing the valve timing and the valve duration after the start of the delay control, the control section changes one of the valve timing and the valve duration based on the other such that a valve overlap becomes less than or equal to a predetermined value.
A valve actuation control apparatus for an internal combustion engine, the engine having a variable valve timing mechanism that changes valve timing of an engine valve and a variable valve duration mechanism that changes valve duration of the engine valve, the apparatus comprising a control section that controls the variable valve timing mechanism and the variable valve duration mechanism, wherein, after a delay control for extending a period from when an engine stop request is made to when the engine actually stops is started, the control section changes the valve timing and the valve duration to valve timing and valve duration suitable for starting the engine, and wherein, when changing the valve timing and the valve duration after the start of the delay control, the control section changes one of the valve timing and the valve duration based on the other such that a valve overlap becomes an amount that corresponds to a misfire limit value.
A valve actuation control apparatus for an internal combustion engine, the engine having a variable valve timing mechanism that changes valve timing of an engine valve and a variable valve duration mechanism that changes valve duration of the engine valve, an actuation position of the variable valve duration mechanism is determined based on a relative movement amount from a reference position, the apparatus comprising a control section that controls the variable valve timing mechanism and the variable valve duration mechanism, wherein, after a delay control for extending a period from when an engine stop request is made to when the engine actually stops is started, the control section changes the valve timing to valve timing suitable for starting the engine, changes the actuation position of the variable valve duration mechanism to the reference position where the valve duration is reduced, learns the reference position, and thereafter changes the valve duration to valve duration suitable for starting the engine.
Dependencies are inferred from the claim text.