Abstract: A combustion system may include a piston, a fuel injector, and a cylinder. At a main fuel injection stage, the fuel injector injects a main fuel into the cylinder in sequence to drive the piston to work. A method for controlling the combustion system includes controlling the fuel injector to execute a first-stage main fuel injection in a compression stroke, the first-stage main fuel injection includes at least one injection, and continues till a power stroke such that the cylinder pressure in the cylinder reaches a target pressure peak value; and before the cylinder pressure in the cylinder reaches a descending critical point, executing a second-stage main fuel injection, the second-stage main fuel injection includes at least one injection, and the fuel injected in the second-stage main fuel injection and the fuel injected in the first-stage main fuel injection are superimposed.

Abstract: A cylinder head includes an intake throat and an intake duct, a valve seat ring is provided in an inner ring of the intake throat; a section of the intake duct is a tumble generating duct; and an extending direction of the tumble generating duct is oblique relative to the cylinder head bottom surface, the lower side surface of the tumble generating duct is a tumble guide surface, the lower end of which forms a tumble generating sharp angle, and the projection of the tumble generating sharp angle on the upper end circular surface of the valve seat ring is a sharp angle projection, the sharp angle projection is a protruding area protruding from the edge of the upper end circular surface of the valve seat ring, and the width of the middle part of the sharp angle projection is larger than the width of both ends thereof.

Abstract: A cylinder head includes an intake throat and an intake duct, a valve seat ring is provided in an inner ring of the intake throat; a section of the intake duct is a tumble generating duct; and an extending direction of the tumble generating duct is oblique relative to the cylinder head bottom surface, the lower side surface of the tumble generating duct is a tumble guide surface, the lower end of which forms a tumble generating sharp angle, and the projection of the tumble generating sharp angle on the upper end circular surface of the valve seat ring is a sharp angle projection, the sharp angle projection is a protruding area protruding from the edge of the upper end circular surface of the valve seat ring, and the width of the middle part of the sharp angle projection is larger than the width of both ends thereof.

Abstract: The present disclosure belongs to the technical field of engines, and specifically relates to a gas mixing device and a natural gas engine. The gas mixing device includes a housing, a first mixing core, a first measurement assembly, a second mixing core, and a second measurement assembly. An air inlet and a combustion gas inlet respectively communicate with the first mixing core to form a mixed gas in the first mixing core; the first measurement assembly is connected to the first mixing core, the second mixing core is connected in the housing, the EGR exhaust gas inlet and the first mixing core respectively communicate with the second mixing core, and the second measurement assembly is connected to the EGR exhaust gas inlet. In the gas mixing device according to the embodiment of the present disclosure, the first measurement assembly and the second measurement assembly respectively provide measurement data for obtaining flow rates of the air, combustion gas and EGR exhaust gas.

Abstract: The present disclosure belongs to the technical field of engines, and specifically relates to a gas mixing device and a natural gas engine. The gas mixing device includes a housing, a first mixing core, a first measurement assembly, a second mixing core, and a second measurement assembly. An air inlet and a combustion gas inlet respectively communicate with the first mixing core to form a mixed gas in the first mixing core; the first measurement assembly is connected to the first mixing core, the second mixing core is connected in the housing, the EGR exhaust gas inlet and the first mixing core respectively communicate with the second mixing core, and the second measurement assembly is connected to the EGR exhaust gas inlet. In the gas mixing device according to the embodiment of the present disclosure, the first measurement assembly and the second measurement assembly respectively provide measurement data for obtaining flow rates of the air, combustion gas and EGR exhaust gas.

Abstract: A method and a system for controlling combustion of a natural gas engine. The method includes: determining, based on a current operation parameter of a natural gas engine, an operation state of the natural gas engine, and calculating a total injection quantity of natural gas and pilot diesel required by the natural gas engine in the operation state; adopting a direct injection diffusion-combustion mode in a case that the operation state is an idle state or a low load state; adopting a natural gas homogeneous hybrid active control compression-ignition mode in a case that the operation state is a medium load state; configuring the total injection quantity into three parts including a compression-ignition natural gas injection quantity, a pilot diesel injection quantity, and a diffusion-combustion natural gas injection quantity in a case that the operation state is a high load state, and sequentially injecting them into a combustion chamber.

Abstract: An apparatus for controlling an air system of a diesel engine in a steady state. The air system comprises a waste gas recycling system and a turbocharging system.

Abstract: Disclosed are an apparatus and a method for controlling a urea injection system of a diesel engine. The apparatus (200) comprises: an operation condition parameter acquiring module (201), a control quantity determining module (202) and a drive signal determining module (203), wherein the operation condition parameter acquiring module (201) is configured to acquire operation condition parameters related to the urea injection system, the control quantity determining module (202) is configured to determine a control quantity for controlling the urea injection system based on the operation condition parameters, a target value of urea pressure in a urea buffer chamber (107) and a control model designed based on a physical model of the urea injection system, and the drive signal determining module (203) is configured to determine a drive signal for a urea pump (103) drive motor (106) according to the determined control quantity.

Abstract: An apparatus for controlling a high pressure common rail system of a diesel engine includes an operation condition parameter acquiring module configured to acquire operation condition parameters associated with the high pressure common rail system; a control quantity determining module coupled with the operation condition parameter acquiring module and configured to determine a control quantity for controlling the high-pressure common rail system based on the operation condition parameters, a target value of the fuel pressure within a high pressure common rail tube cavity and a control model designed based on a system physical model, wherein the control quantity is an equivalent cross-section area of the electromagnetic valve of a flow metering unit; and a drive signal determining module coupled to the control quantity determining module and configured to determine a drive signal for driving the flow metering unit based on the determined control quantity.

Abstract: An apparatus (200) for controlling the rail pressure of the high-pressure common-rail tube cavity of the high-pressure common-rail fuel system of an engine, comprising an operation condition acquiring device (202), which is used for acquiring operation conditions associated with the high-pressure common-rail fuel system of the engine; a fuel quantity metering valve equivalent cross-sectional area determining device (204) coupled with the operation condition acquiring device (202), which is used for determining an equivalent cross-sectional area of the fuel quantity metering valve (210) by a linear physical model (212) of fuel quantity metering valve equivalent cross-sectional area based on an acquired operation condition and a target value of the rail pressure of the high-pressure common-rail tube cavity; a signal generating device (206) coupled with the fuel quantity metering valve equivalent cross-sectional area determining device (204), which used for generating a driving signal (208) for controlling the e

Abstract: A control device and method for the air system of a diesel engine is disclosed. The feature of the diesel engine is characterized by transfer function. During the control process, a decoupling transfer function is computed according to the transfer function and the steady working parameters of the diesel engine. By the decoupling transfer function acting on the processed state parameters of the air system, driving signals for controlling the exhaust gas recirculation system and the turbocharge system can be individually generated from one another, in order to realize decoupling of them.

Abstract: An equipment (200) for controlling an air system of a diesel engine, comprises an operation condition acquiring device (202), an objective flow determining device (204) and a signal generating device (206). The operation condition acquiring device (202) is used to acquire actual operation condition parameters of the diesel engine. The objective flow determining device (204) is used to determine objective flow parameters on the basis of the actual operation condition parameters from the operation condition acquiring device (202), through a non-linear physical model which characterizes the air system. The signal generating device (206) is used to generate signals for controlling an EGR system and a turbocharge system on the basis of the objective flow parameters from the objective flow determining device (204). A method for controlling an air system of a diesel engine and a computer program medium recording the computer program code for performing the method are also disclosed.

Abstract: An apparatus for controlling an air system of a diesel engine in a steady state. The air system comprises a waste gas recycling system and a turbocharging system.

Abstract: A control device and method for the air system of a diesel engine is disclosed. The feature of the diesel engine is characterized by transfer function. During the control process, a decoupling transfer function is computed according to the transfer function and the steady working parameters of the diesel engine. By the decoupling transfer function acting on the processed state parameters of the air system, driving signals for controlling the exhaust gas recirculation system and the turbocharge system can be individually generated from one another, in order to realize decoupling of them.

Abstract: Disclosed are an apparatus and a method for controlling a urea injection system of a diesel engine. The apparatus (200) comprises: an operation condition parameter acquiring module (201), a control quantity determining module (202) and a drive signal determining module (203), wherein the operation condition parameter acquiring module (201) is configured to acquire operation condition parameters related to the urea injection system, the control quantity determining module (202) is configured to determine a control quantity for controlling the urea injection system based on the operation condition parameters, a target value of urea pressure in a urea buffer chamber (107) and a control model designed based on a physical model of the urea injection system, and the drive signal determining module (203) is configured to determine a drive signal for a urea pump (103) drive motor (106) according to the determined control quantity.

Abstract: An apparatus (200) for controlling a high pressure common rail system of a diesel engine comprises an operation condition parameter acquiring module (201) configured to acquire operation condition parameters associated with the high pressure common rail system; a control quantity determining module (202) coupled with the operation condition parameter acquiring (201) module and configured to determine a control quantity for controlling the high-pressure common rail system based on the operation condition parameters, a target value of the fuel pressure within a high pressure common rail tube cavity and a control model designed based on a system physical model, wherein the control quantity is an equivalent cross-section area of the electromagnetic valve of a flow metering unit; and a drive signal determining module (203) coupled to the control quantity determining module (202) and configured to determine a drive signal for driving the flow metering unit based on the determined control quantity.

Abstract: An apparatus (200) for controlling the rail pressure of the high-pressure common-rail tube cavity of the high-pressure common-rail fuel system of an engine, comprising an operation condition acquiring device (202), which is used for acquiring operation conditions associated with the high-pressure common-rail fuel system of the engine; a fuel quantity metering valve equivalent cross-sectional area determining device (204) coupled with the operation condition acquiring device (202), which is used for determining an equivalent cross-sectional area of the fuel quantity metering valve (210) by a linear physical model (212) of fuel quantity metering valve equivalent cross-sectional area based on an acquired operation condition and a target value of the rail pressure of the high-pressure common-rail tube cavity; a signal generating device (206) coupled with the fuel quantity metering valve equivalent cross-sectional area determining device (204), which used for generating a driving signal (208) for controlling the e

Abstract: An equipment (200) for controlling an air system of a diesel engine, comprises an operation condition acquiring device (202), an objective flow determining device (204) and a signal generating device (206). The operation condition acquiring device (202) is used to acquire actual operation condition parameters of the diesel engine. The objective flow determining device (204) is used to determine objective flow parameters on the basis of the actual operation condition parameters from the operation condition acquiring device (202), through a non-linear physical model which characterizes the air system. The signal generating device (206) is used to generate signals for controlling an EGR system and a turbocharge system on the basis of the objective flow parameters from the objective flow determining device (204). A method for controlling an air system of a diesel engine and a computer program medium recording the computer program code for performing the method are also disclosed.