摘要:
To effectively suppress an intense knock and improve reliability of an engine. A method for predicting occurrence of a knock with a predetermined intensity or higher (intense knock) in an engine 1 that burns an air-fuel mixture of gasoline fuel is provided. Pressure in a combustion chamber 17 (cylinder inner pressure) is detected in an initial stage of combustion. The cylinder inner pressure is compared with a preset reference value SV to determine whether or not the cylinder inner pressure exceeds the reference value SV during the course of the combustion. When the cylinder inner pressure exceeds the reference value SV, it is predicted that the intense knock occurs before an end of the combustion.
摘要:
Methods and systems for controlling an internal combustion engine are provided. One example method may include closing an intake valve later during a cylinder cycle than a timing with which an amount of air inducted into a cylinder from an air intake passage would be maximized, and earlier during the cylinder cycle as a desired amount of air to be inducted into the cylinder increases, while an engine is operating at a given engine speed. The method may further include closing the intake valve earlier during a cylinder cycle as the engine speed increases when the desired amount of air to be inducted into the cylinder is at a maximum.
摘要:
A system and method of controlling an internal combustion engine are provided. The method includes closing an intake valve at a timing in a first range, which is before a maximum charge closing timing with which an amount of air inducted into a cylinder from an air intake passage would be maximized at a given engine speed, during a cylinder cycle when a desired amount of air to be inducted into said cylinder is less than or equal to a predetermined air amount at the given engine speed. The method further includes closing said intake valve at a timing in a second range, which is after said maximum charge closing timing and separated from said first range during a cylinder cycle, when a desired amount of air to be inducted into said cylinder is greater than said predetermined air amount at the given engine speed.
摘要:
Methods and systems for controlling an internal combustion engine are provided. One example method may include closing an intake valve later during a cylinder cycle than a timing with which an amount of air inducted into a cylinder from an air intake passage would be maximized, and earlier during the cylinder cycle as a desired amount of air to be inducted into the cylinder increases, while an engine is operating at a given engine speed. The method may further include closing the intake valve earlier during a cylinder cycle as the engine speed increases when the desired amount of air to be inducted into the cylinder is at a maximum.
摘要:
A multi-hole injector (15) directly injects fuel into a combustion chamber (5). Intake air is introduced into the combustion chamber (5) through intake ports (6) to provide tumble flow in the combustion chamber (5). A cavity (3d) is formed in a part of the top surface of a piston (3) which is eccentric to the exhaust side. In the intake stroke, fuel injection ends in a downstroke of a piston (3). When the crank angle is 100 degrees after the top dead center in the intake stroke at which the fuel injection ends, a most downward lower spray collides with a part of the top surface (3a) of the piston (3) which ranges on the intake side from the edge on the exhaust side of the cavity. A most upward upper spray does not come into contact with a spark plug (13). Thus, the fuel injection can enhance the tumble flow to promote homogeneous dispersion of fuel-air mixture in the combustion chamber (5).
摘要:
To effectively suppress an intense knock and improve reliability of an engine. The engine includes: a combustion chamber 17 defined in a cylinder 11 by a piston 3; a fuel supply device 61 that supplies fuel containing gasoline into the combustion chamber 17; an ECU 8 having knock occurrence prediction means 80 for predicting occurrence of a knock; and an injector 6 that injects the fuel into the combustion chamber 17. When the knock occurrence prediction means 80 predicts occurrence of an intense knock with a predetermined intensity or higher, the injector 6 injects the fuel into the combustion chamber 17 within a period before the burned mass fraction reaches 50% after a start of combustion.
摘要:
There is provided a method of controlling a spark ignited internal combustion engine having a fuel injector 53 which injects fuel directly into its combustion chamber 17. The method comprises injecting fuel so as to complete the fuel injection by an early compression stroke during a cylinder cycle when a speed of the engine is a first speed. The method further comprises injecting a first stage fuel so as to complete the first stage fuel injection by an early compression stroke during a cylinder cycle and injecting a second stage fuel in a late compression stroke during the cylinder cycle when an engine speed is a second speed that is less than the first speed. An amount of the second stage fuel is greater than an amount of said first stage fuel. Accordingly, any of the first and second stage fuels may not be pre-ignited before the spark ignition.
摘要:
There is provided a method of controlling a spark ignited internal combustion engine having a fuel injector 53 which injects fuel directly into its combustion chamber 17. The method comprises injecting fuel so as to complete the fuel injection by an early compression stroke during a cylinder cycle when a speed of the engine is a first speed. The method further comprises injecting a first stage fuel so as to complete the first stage fuel injection by an early compression stroke during a cylinder cycle and injecting a second stage fuel in a late compression stroke during the cylinder cycle when an engine speed is a second speed that is less than the first speed. An amount of the second stage fuel is greater than an amount of said first stage fuel. Accordingly, any of the first and second stage fuels may not be pre-ignited before the spark ignition.