Abstract:
Es werden ein Dieselmotor, insbesondere ein Hochleistungsdieselmotor, mit einem variablen Ventiltrieb (13), der eine Verstelleinheit (14) zur Verstellung einer Ventilöffhungszeit, eines Ventilhubs, einer Nockenwellenphasenlage und/oder einer Ventilspreizung aufweist, und mit einer Steuer- und/oder Regeleinheit (16) zur Ansteuerung der Verstelleinheit (14), wobei die Steuer- und/oder Regeleinheit (16) zumindest einen, für einen Motorstart bei niedrigen Motortemperaturen vorgesehenen Betriebsmodus aufweist, in dem die Steuer- und/oder Regel einheit (16) dazu vorgesehen ist, zumindest während einer Vorlaufphase für zumindest ein Einlassventil (18, 19, 20, 21) eine Ventilöffhungszeit einzustellen, die sich zumindest mit einem Kompressionstakt eines zugeordneten Zylinders (1, 2, 3, 4) überschneidet, und eine Einspritzung von Kraftstoff zumindest in dem dem Einlassventil (18, 19, 20, 21) zugeordneten Zylinder (1, 2, 3, 4) auszusetzen, und ein Verfahren zum Starten eines solchen Dieselmotors vorgeschlagen.
Abstract:
Es wird ein Dieselmotor vorgeschlagen, insbesondere ein Hochleistungsdieselmotor, mit einem variablen Ventiltrieb (13), der eine Verstelleinheit (14) zumindest zur Verstellung eines Schließwinkels von zumindest einem Einlassventil (18, 19, 20, 21) aufweist, und mit einer Steuer- und/oder Regeleinheit (16), die zumindest einen Betriebsmodus aufweist, der für einen Kaltstart vorgesehen ist, wobei die Steuer- und/oder Regeleinheit (16) in dem Betriebsmodus dazu vorgesehen ist, durch Ansteuerung der Verstelleinheit (14) den Schließwinkel des zumindest einen Einlassventils (18, 19, 20, 21) in Richtung Spät zu verstellen.
Abstract:
An internal combustion engine includes a piston, a plurality of intake valves, an exhaust valve, a valve drive unit, an intake valve halting unit, an injector, and an ECU. The ECU configured to: (a) control the valve drive unit so as to close the exhaust valve on an advance side of the exhaust top-dead-center of the piston, when an engine temperature is lower than a prescribed value; (b) control the intake valve halting unit so as to halt the operation of the portion of intake valves in a closed state, when the engine temperature is lower than the prescribed value; and (c) control the valve control unit so as to form a negative overlap between the exhaust valve and the intake valve other than the portion of intake valves, among the plurality of intake valves, when the engine temperature is lower. than the prescribed value.
Abstract:
A cylinder of an internal combustion engine is provided with a turbo-side exhaust valve that opens and closes an exhaust port that communicates with a turbo-side exhaust passageway that leads to a turbine inlet opening of a turbo-supercharger, a bypass-side exhaust valve that opens and closes an exhaust port that communicates with a bypass-side exhaust passageway that bypasses the turbine, a first intake valve disposed opposite to the turbo-side exhaust valve, and a second intake valve disposed opposite to the bypass-side exhaust valve. At the time of engine startup and/or the time of low engine load, the turbo-side exhaust valve and the first intake valve are sto ed in the closed state.
Abstract:
A control apparatus includes a detection unit that detects a stop request to an engine, a throttle closing control unit that, when the stop request is detected, adjusts an opening amount of a throttle valve to an engine-stop throttle valve opening amount smaller than a current opening amount, an engine stop detection unit that detects a stop of the engine, an engine-stop exhaust valve control unit that adjusts an opening/closing characteristic of an exhaust valve of a cylinder that will be placed initially in an intake stroke when the engine is restarted so that, when the opening amount of the throttle valve is adjusted to the engine-stop throttle valve opening amount and a stop of the engine is detected, the exhaust valve has an engine-stop exhaust valve opening/closing characteristic by which a closing timing of the exhaust valve is more delayed than a current closing timing of the exhaust valve.
Abstract:
The invention relates to a cylinder-charge control method. According to said method, residual gas in the cylinder is recycled internally and is intermittently shunted in front of the inlet valve(s), by controlling the closure times (AS) of at least one outlet valve of the respective cylinder and by opening (EO1) at least one inlet valve in the vicinity of the upper response point (OT) of the piston and at least one inlet valve is opened in at least two chronologically separate phases (EO1, ES1, EO2, ES2) during a charge cycle in the cylinder. Said method optimizes the operation of the motor in the warm-up period in terms of consumption, pollution emission and smooth running.
Abstract:
An apparatus for controlling exhaust temperature in an internal combustion engine having an exhaust system (19, 22) comprising at least one catalytic converter (23). The apparatus comprises at least one temperature sensing means (26) for sensing exhaust temperature. This temperature sensing means is connected to a control unit (25), which in its turn is connected to means (24, 27-34) for controlling at least one of the engine operation parameters, i.e. the fuel/air mixture, the ignition timing, the timing of the opening and closing of the valves or the flow speed of the gases.