Abstract: An engine control device is provided which includes a first fuel injection valve; a second injection valve provided at such a position that the amount of fuel injected by the second fuel injection valve and adhering to the inner peripheral wall of a cylinder is smaller; a cooling water temperature detector for detecting the temperature of cooling water for cooling an engine; and an injection ratio determining arrangement for determining the ratio between the amount of fuel injected by the first fuel injection valve and the amount of fuel injected by the second fuel injection valve based on the temperature of cooling water. The injection ratio determining arrangement stores an injection amount adjustment operation range in which the injection ratio determining arrangement is configured to increase the fuel injection ratio of the amount of fuel injected by the second fuel injection valve, when the temperature of cooling water falls.

Abstract: A controlling apparatus for an engine, includes: an auto-ignition index calculating unit that is configured to calculate, based on a cylinder temperature and a cylinder pressure in a combustion chamber, an auto-ignition index which indicates easiness of occurrence of auto-ignition of fuel at a crank angle before an ignition timing in a compression stroke; a first correction coefficient calculating unit that is configured to calculate, based on an amount of fuel adhering to a wall surface of the combustion chamber at the crank angle, a wall-adhering fuel correction coefficient for correcting the auto-ignition index; and a low-speed pre-ignition predicting unit that is configured to predict, based on the auto-ignition index and the wall-adhering fuel correction coefficient, occurrence of low-speed pre-ignition.

Abstract: An engine control device (1) having a supercharger (30) includes an injection controller (3) that controls injections of fuel through a cylinder injection valve (11) and through a port injection valve (12), based on a rotation speed Ne of an engine (10), and a variable valve controller (5) that controls a variable valve actuating mechanism (40) based on the rotation speed Ne. The variable valve controller (5) provides a valve overlap period in a first rotation speed region, and shortens the valve overlap period in a second rotation speed region of greater rotation speeds Ne than in the first rotation speed region. The injection controller (3), in the period during which the rotation speed is shifting from the first rotation speed region to the second rotation speed region, carries out a cylinder injection and a port injection, and advances timing for injecting the fuel through the port injection valve (12).

Abstract: An engine control device for an engine provided with a supercharger, including a cylinder injection valve and a port injection valve. The device includes an injection controller that controls injections of fuel through the cylinder injection valve and through the port injection valve, on the basis of at least a load on an engine. The injection controller, in a low load operating state, causes the fuel to be injected through the port injection valve; in an intermediate load operating state, causes the fuel to be injected through the cylinder injection valve during an intake stroke, and causes the fuel to be injected through the port injection valve; and in a high load operating state, causes the fuel to be injected through the cylinder injection valve at least during an intake stroke and during a compression stroke.

Abstract: An engine includes first nozzles, second nozzles and a control unit. The first nozzles are arranged in cylinders, and inject fuel directly into the cylinders respectively. The second nozzles are arranged in intake ports of the cylinders, and inject fuel into the intake ports respectively. The control unit controls fuel injection of the first nozzles and the second nozzles. When the engine is started, the control unit performs initial fuel injection by one of the first and second nozzles into the cylinders having odd-number of initial ignition order, and performs initial fuel injection by the other one of the first and second nozzles into the cylinders having even-number of initial ignition order.

Abstract: An engine control device is provided which includes a first fuel injection valve; a second injection valve provided at such a position that the amount of fuel injected by the second fuel injection valve and adhering to the inner peripheral wall of a cylinder is smaller; a cooling water temperature detector for detecting the temperature of cooling water for cooling an engine; and an injection ratio determining arrangement for determining the ratio between the amount of fuel injected by the first fuel injection valve and the amount of fuel injected by the second fuel injection valve based on the temperature of cooling water. The injection ratio determining arrangement stores an injection amount adjustment operation range in which the injection ratio determining arrangement is configured to increase the fuel injection ratio of the amount of fuel injected by the second fuel injection valve, when the temperature of cooling water falls.

Abstract: Fuel in a fuel tank is supplied by a low-pressure pump to intake passage injectors mounted on an intake manifold via a low-pressure fuel supply pipe and a low-pressure fuel distribution pipe. A high-pressure pump is provided on the low-pressure fuel supply pipe. The pressure of the fuel is boosted by the high-pressure pump, and then is supplied to in-cylinder injectors via a high-pressure fuel distribution pipe. In an intake passage injection (MPI) mode, excitation of a solenoid is stopped and operation of an electromagnetic spill valve is stopped so as reduce vibration and noise caused by the seating of the electromagnetic spill valve in a valve seat.

Abstract: A controlling apparatus for an engine, includes: an auto-ignition index calculating unit that is configured to calculate, based on a cylinder temperature and a cylinder pressure in a combustion chamber, an auto-ignition index which indicates easiness of occurrence of auto-ignition of fuel at a crank angle before an ignition timing in a compression stroke; a first correction coefficient calculating unit that is configured to calculate, based on an amount of fuel adhering to a wall surface of the combustion chamber at the crank angle, a wall-adhering fuel correction coefficient for correcting the auto-ignition index; and a low-speed pre-ignition predicting unit that is configured to predict, based on the auto-ignition index and the wall-adhering fuel correction coefficient, occurrence of low-speed pre-ignition.

Abstract: Provided is a control unit (1) for an internal combustion engine (10) including a direct injector (11) directly injecting fuel into a cylinder (20) and a port injector (12) injecting fuel into an intake port (17). The control unit (1) includes an injection volume calculator (5) to calculate a volume of the fuel injected from the direct injector (11), a port injection controller (2) to control a volume of the fuel injected from the port injector (12), an overlap period controller (4) to control an overlap period during which both an intake valve (27) and an exhaust valve (28) are open, and a changer (6) to vary both the volume of the port injection from the port injector (12) and the overlap period based on the volume of the direct injection.

Abstract: An engine control device (1) for an engine provided with a supercharger (30), including a cylinder injection valve (11), a port injection valve (12), and a variable valve actuating mechanism (40). The device includes an injection controller (3) that controls injections of fuel through the cylinder injection valve (11) and through the port injection valve (12), on the basis of a load P on the engine (10), and a variable valve controller (5) that controls the variable valve actuating mechanism (40) on the basis of the load P. The variable valve controller (5) provides a valve overlap period in an operating state where the load P is equal to or greater than a first predetermined value P1.

Abstract: A control unit for an internal combustion engine includes a load detector to detect a load on the engine, an injection volume calculator to calculate a cylinder injection volume indicating a volume of fuel injected from a direct injector, a first controller to perform a first control for increasing the frequency of the injection by the direct injector upon a reduction in the cylinder injection volume, a second controller to perform a second control for increasing a port injection volume indicating a volume of fuel injected from a port injector upon a reduction in the cylinder injection volume, and a switching controller to switch between the first control with the first controller and the second control with the second controller depending on the load.

Abstract: An engine control device for an engine provided with a supercharger, including a cylinder injection valve and a port injection valve. The device includes an injection controller that controls injections of fuel through the cylinder injection valve and through the port injection valve, on the basis of at least a load on an engine. The injection controller, in a low load operating state, causes the fuel to be injected through the port injection valve; in an intermediate load operating state, causes the fuel to be injected through the cylinder injection valve during an intake stroke, and causes the fuel to be injected through the port injection valve; and in a high load operating state, causes the fuel to be injected through the cylinder injection valve at least during an intake stroke and during a compression stroke.

Abstract: An engine control device (1) for an engine provided with a supercharger (30), including a cylinder injection valve (11), a port injection valve (12), and a variable valve actuating mechanism (40). The device includes an injection controller (3) that controls injections of fuel through the cylinder injection valve (11) and through the port injection valve (12), on the basis of a load P on the engine (10), and a variable valve controller (5) that controls the variable valve actuating mechanism (40) on the basis of the load P. The variable valve controller (5) provides a valve overlap period in an operating state where the load P is equal to or greater than a first predetermined value P1.

Abstract: An engine control device (1) for an engine provided with a supercharger (30), including a cylinder injection valve (11), a port injection valve (12), and a variable valve actuating mechanism (40). The device includes an injection controller (3) that controls injections of fuel through the cylinder injection valve (11) and through the port injection valve (12), on the basis of a rotation speed Ne of the engine (10), and a variable valve controller (5) that controls the variable valve actuating mechanism (40) on the basis of the rotation speed Ne. The variable valve controller (5) provides a valve overlap period in a first rotation speed region, and shortens the valve overlap period in a second rotation speed region of greater rotation speeds Ne than in the first rotation speed region.

Abstract: An engine includes first nozzles, second nozzles and a control unit. The first nozzles are arranged in cylinders, and inject fuel directly into the cylinders respectively. The second nozzles are arranged in intake ports of the cylinders, and inject fuel into the intake ports respectively. The control unit controls fuel injection of the first nozzles and the second nozzles. When the engine is started, the control unit performs initial fuel injection by one of the first and second nozzles into the cylinders having odd-number of initial ignition order, and performs initial fuel injection by the other one of the first and second nozzles into the cylinders having even-number of initial ignition order.

Abstract: Fuel in a fuel tank is supplied by a low-pressure pump to intake passage injectors mounted on an intake manifold via a low-pressure fuel supply pipe and a low-pressure fuel distribution pipe. A high-pressure pump is provided on the low-pressure fuel supply pipe. The pressure of the fuel is boosted by the high-pressure pump, and then is supplied to in-cylinder injectors via a high-pressure fuel distribution pipe. In an intake passage injection (MPI) mode, excitation of a solenoid is stopped and operation of an electromagnetic spill valve is stopped so as reduce vibration and noise caused by the seating of the electromagnetic spill valve in a valve seat.

Abstract: Provided is a control unit (1) for an internal combustion engine (10) including a direct injector (11) directly injecting fuel into a cylinder (20) and a port injector (12) injecting fuel into an intake port (17). The control unit (1) includes an injection volume calculator (5) to calculate a volume of the fuel injected from the direct injector (11), a port injection controller (2) to control a volume of the fuel injected from the port injector (12), an overlap period controller (4) to control an overlap period during which both an intake valve (27) and an exhaust valve (28) are open, and a changer (6) to vary both the volume of the port injection from the port injector (12) and the overlap period based on the volume of the direct injection.

Abstract: A control unit for an internal combustion engine includes a load detector to detect a load on the engine, an injection volume calculator to calculate a cylinder injection volume indicating a volume of fuel injected from a direct injector, a first controller to perform a first control for increasing the frequency of the injection by the direct injector upon a reduction in the cylinder injection volume, a second controller to perform a second control for increasing a port injection volume indicating a volume of fuel injected from a port injector upon a reduction in the cylinder injection volume, and a switching controller to switch between the first control with the first controller and the second control with the second controller depending on the load.

Abstract: Just after the start of an engine at cold start, an overlap in the opening time of an intake valve (7a) and an exhaust valve (7b) is controlled to include an intake stroke range, such that liquid fuel in an intake port (11) flows into a cylinder with the downward movement of a piston (16) without being directly exhausted to an exhaust side, so that the fuel can be combusted without fail.

Abstract: Just after the start of an engine at cold start, an overlap in the opening time of an intake valve (7a) and an exhaust valve (7b) is controlled to include an intake stroke range, such that liquid fuel in an intake port (11) flows into a cylinder with the downward movement of a piston (16) without being directly exhausted to an exhaust side, so that the fuel can be combusted without fail.