Valve control device and method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroshi Enomoto
Life of this patent
Estimating the term…
Abstract
A valve control device performs control for eliminating or preventing fixation of an EGR valve (30) by opening/closing the valve near its fully closed position. After an engine stops, the valve control device performs “a fixation avoiding operation” for opening/closing EGR valve (30) near the fully closed position, and further, performs “a fixation determining operation”. When it is determined that the fixation of EGR valve (30) is eliminated, EGR valve (30) is positioned at the fully closed position, and a reference position is corrected such that the fully closed position is regarded as a reference position at which a valve opening/closing control is performed during the operation of the engine.
Claims16
A valve control device for an internal combustion engine comprising:
- a valve disposed on a gas pipe in the internal combustion engine and allowing variation in flow rate of gas flowing in the pipe by opening/closing operations;
- and
- a valve actuating unit for performing a fixation avoiding operation for eliminating or preventing any fixation of the valve by opening/closing motions of the valve by a movement quantity for eliminating the fixation in one or the other direction near a valve fully closed position;
- wherein
- said valve actuating unit starts an operation for moving the valve in said one direction during said fixation avoiding operation, starts an operation for moving the valve in said other direction when a valve movement quantity does not reach said movement quantity for eliminating the fixation even after a lapse of a predetermined movement control time and starts the operation for moving the valve in said one direction when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time during the operation for moving the valve in the other direction, and finishes the fixation avoiding operation after the operations for moving the valve in one direction and in the other direction are performed predetermined times.
A valve control method for an internal combustion engine provided with a valve disposed on a gas pipe in the internal combustion engine and allowing variation in flow rate of gas flowing in the pipe by opening/closing operations, and a valve actuating unit for performing a fixation avoiding operation for eliminating or preventing any fixation of the valve by opening/closing motions of the valve by a movement quantity for eliminating the fixation in one or the other direction near a valve fully closed position, said valve control method for an internal combustion engine comprising the steps of:
- starting an operation for moving the valve in said one direction during said fixation avoiding operation;
- starting an operation for moving the valve in said other direction when a valve movement quantity does not reach said movement quantity for eliminating the fixation even after a lapse of a predetermined movement control time, and starting the operation for moving the valve in said one direction when the valve movement quantity does not reach said movement quantity for eliminating the fixation even after the lapse of the predetermined movement control time during the operation for moving the valve in the other direction;
- and
- finishing the fixation avoiding operation after the operations for moving the valve in one direction and in the other direction predetermined times.
Dependencies are inferred from the claim text.