KR101744823B1 - Control method for cda apparatus and fuel injection of diesel engine - Google Patents

Control method for cda apparatus and fuel injection of diesel engine Download PDF

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Publication number
KR101744823B1
KR101744823B1 KR1020150176036A KR20150176036A KR101744823B1 KR 101744823 B1 KR101744823 B1 KR 101744823B1 KR 1020150176036 A KR1020150176036 A KR 1020150176036A KR 20150176036 A KR20150176036 A KR 20150176036A KR 101744823 B1 KR101744823 B1 KR 101744823B1
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South Korea
Prior art keywords
cylinder
cda
mode
fuel injection
amount
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KR1020150176036A
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Korean (ko)
Inventor
한경찬
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현대자동차 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/021—Engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The present invention relates to a CDA apparatus and a fuel injection control method of a diesel engine equipped with a CDA apparatus capable of stopping a valve of a part of an engine, Obtaining a signal including a boost pressure, an exhaust pressure, an intake air amount, and an EGR opening rate to determine a current operating state of the engine; Determining whether the controller needs to change the operating mode of the CDA device; Outputting a CDA mode switching command when the operating mode of the CDA device is in a normal mode and a change to a CDA mode is required; The controller determining a mode switching time; The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to decrease the fuel injection amount of the stopped cylinder according to the determined mode change time and the determined injected fuel amount for each cylinder, ; And initiating operation of the CDA device of the idle cylinder if the fuel injection amount of the idle cylinder is less than a predetermined value.

Description

 TECHNICAL FIELD [0001] The present invention relates to a CDA apparatus and a fuel injection control method for a diesel engine,

The present invention relates to a CDA apparatus and a fuel injection control method for a diesel engine, and more particularly, to a CDA apparatus and a fuel injection control method in a mode transition transition period of a CDA apparatus of an engine.

The fuel quantity control of the gasoline engine is interlocked with the valve idle / operating condition, and the reduction of the fuel quantity of the idle cylinder and the increase of the fuel quantity of the operating cylinder are momentarily controlled.

This is because the engine vibration is not excessively generated in the mode transition transition period of the CDA apparatus of the gasoline engine.

However, unlike a gasoline engine, diesel engines have relatively large engine vibrations and unstable combustion during mode transition, resulting in engine collision and torque shock.

Further, the vibration generated when the mode transition of the diesel engine occurs may cause breakage of the exhaust gas filtering device or may cause the performance of the engine to be reduced.

The present invention provides a CDA apparatus and a fuel injection control method for a diesel engine that controls the CDA device and the amount of fuel per cylinder at the time of changing the CDA mode of a diesel engine to suppress the occurrence of engine stall and torque shock.

A CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention relate to a CDA apparatus and a fuel injection control method of a diesel engine equipped with a CDA apparatus capable of stopping a valve of a partial cylinder of an engine.

The CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention include the engine speed, the opening degree of the accelerator pedal, the cooling water temperature, the operating mode of the CDA device, the supercharging pressure, the exhaust pressure, the intake air amount, Obtaining a signal to determine whether the controller is currently operating the engine; Determining whether the controller needs to change the operating mode of the CDA device; Outputting a CDA mode switching command when the operating mode of the CDA device is in a normal mode and a change to a CDA mode is required; The controller determining a mode switching time; The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to decrease the fuel injection amount of the stopped cylinder according to the determined mode change time and the determined injected fuel amount for each cylinder, ; And initiating operation of the CDA device of the idle cylinder if the fuel injection amount of the idle cylinder is less than a predetermined value.

The CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention may include a step of the controller recognizing the operation mode of the current CDA device as the CDA mode when the fuel injection amount of the idle cylinder becomes "0 &; ≪ / RTI >

The sum of the final injected fuel quantities of the non-idle cylinders may be equal to the sum of the injected fuel quantities of the respective cylinders at the time when the controller outputs the CDA mode switching command.

The mode switching time may be determined according to the engine speed and the pedal opening angle at the time of the determination.

A brake torque in which the amount of fuel injected by each cylinder is determined according to the engine speed and the opening degree of the accelerator pedal; A friction torque for each cylinder determined according to the engine speed, the cooling water temperature, and the operating mode of the CDA device for each cylinder; A net indicated torque for each cylinder determined by a sum of the brake torque and the friction torque; A pumping loss of each cylinder determined according to the boost pressure, the exhaust pressure, and the operating mode of the CDA apparatus; A gross indicated torque of each cylinder determined according to the netindicate torque of each cylinder and the pumping loss of each cylinder; And an efficiency of each cylinder determined according to the engine speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the operating mode of the CDA device have.

The injected fuel amount for each cylinder may be determined as a value obtained by dividing the gross indicative torque of each cylinder by the efficiency of each cylinder.

The CDA apparatus and the fuel injection control method of a diesel engine according to an embodiment of the present invention are characterized in that when the operation mode of the current CDA apparatus is the normal mode and the change to the CDA mode is not required, And maintaining the operating mode.

The CDA apparatus and the fuel injection control method of the diesel engine according to the embodiment of the present invention are characterized in that when the operation mode of the current CDA apparatus is the CDA mode and the change to the normal mode is required, step; The controller deactivating the CDA device of the idle cylinder; The controller determining a mode switching time; The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to increase the fuel injection amount of the idle cylinder according to the determined mode switching time and the determined injection fuel amount for each cylinder, ; And the controller recognizing the operation mode of the current CDA device as the normal mode when the fuel injection amounts of the cylinders become equal to each other.

The CDA device and the fuel injection control method of a diesel engine according to an embodiment of the present invention are characterized in that when the operation mode of the current CDA device is the CDA mode and the change to the normal mode is not required, And maintaining the operating mode.

The CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention include the engine speed, the opening degree of the accelerator pedal, the cooling water temperature, the operating mode of the CDA device, the supercharging pressure, the exhaust pressure, the intake air amount, Obtaining a signal to determine whether the controller is currently operating the engine; Determining whether the controller needs to change the operating mode of the current CDA device; If the operation mode of the current CDA device is a CDA mode and a change to a normal mode is required, the controller outputs a normal mode switching command; The controller deactivating the CDA device of the idle cylinder; The controller determining a mode switching time; The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to increase the fuel injection amount of the idle cylinder according to the determined mode switching time and the determined injection fuel amount for each cylinder, ; And the controller recognizing the operation mode of the current CDA device as the normal mode when the fuel injection amounts of the cylinders become equal to each other.

The mode switching time may be determined according to the engine speed and the pedal opening angle at the time of the determination.

A brake torque in which the amount of fuel injected by each cylinder is determined according to the engine speed and the opening degree of the accelerator pedal; A friction torque for each cylinder determined according to the engine speed, the cooling water temperature, and the operating mode of the CDA device for each cylinder; A net indicated torque for each cylinder determined by a sum of the brake torque and the friction torque; A pumping loss of each cylinder determined according to the boost pressure, the exhaust pressure, and the operating mode of the CDA apparatus; A gross indicated torque of each cylinder determined according to the netindicate torque of each cylinder and the pumping loss of each cylinder; And an efficiency of each cylinder determined according to the engine speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the operating mode of the CDA device have.

The injected fuel amount for each cylinder may be determined as a value obtained by dividing the gross indicative torque of each cylinder by the efficiency of each cylinder.

The CDA device and the fuel injection control method of a diesel engine according to the present invention may include a step of the controller outputting a CDA mode switching command when the operating mode of the current CDA device is in a normal mode and a change to a CDA mode is required; The controller determining a mode switching time; The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to decrease the fuel injection amount of the stopped cylinder according to the determined mode change time and the determined injected fuel amount for each cylinder, ; And initiating operation of the CDA device of the idle cylinder if the fuel injection amount of the idle cylinder is less than a predetermined value.

The CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention may include a step of the controller recognizing the operation mode of the current CDA device as the CDA mode when the fuel injection amount of the idle cylinder becomes "0 &; ≪ / RTI >

The sum of the final injected fuel quantities of the non-idle cylinders may be equal to the sum of the injected fuel quantities of the respective cylinders at the time when the controller outputs the CDA mode switching command.

The CDA apparatus and the fuel injection control method of a diesel engine according to an embodiment of the present invention are characterized in that when the operation mode of the current CDA apparatus is the normal mode and the change to the CDA mode is not required, And maintaining the operating mode.

The CDA device and the fuel injection control method of a diesel engine according to an embodiment of the present invention are characterized in that when the operation mode of the current CDA device is the CDA mode and the change to the normal mode is not required, And maintaining the operating mode.

According to the CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention, precise torque control can be performed in the normal mode of the CDA device and the transition period of the CDA mode, thereby ensuring the vehicle's quietness.

Further, according to the CDA apparatus and the fuel injection control method of the diesel engine according to the embodiment of the present invention, the torque shock is mitigated in the normal mode of the CDA apparatus and the transition period of the CDA mode to improve the fuel economy and prevent exhaust gas deterioration .

Also, according to the CDA apparatus and the fuel injection control method of the diesel engine according to the embodiment of the present invention, the CDA effect of the diesel engine can be maximized by securing the temperature of the after-treatment system in the CDA mode of the CDA apparatus.

1 is a configuration diagram of a diesel engine to which a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention can be applied.
2 is a block diagram of a system to which a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention are applicable.
3 is a flowchart showing a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention.
4 is a graph illustrating a change in the CDA operating mode according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein

Like numbers refer to like elements throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a diesel engine system to which a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention are applicable. FIG. 2 is a block diagram of a CDA apparatus and a fuel injection control Fig. 1 is a block diagram of a diesel engine system to which the method is applicable.

1 and 2, a diesel system to which a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention are applicable includes a diesel engine 10 having a plurality of cylinders 12, 14, 16, ).

Injectors 32,34, 36,38 are provided to inject fuel into each cylinder 12,14,16,18 and a CDA device 20 is provided in at least a portion of the cylinders 14,16.

In the figure, the diesel engine 10 includes first, second, third and fourth cylinders 12, 14, 16 and 18, and the second and third cylinders 14 and 16, respectively, However, the present invention is not limited thereto, and the CDA device 20 may be provided in the first and fourth cylinders 12 and 18. The CDA device and the fuel injection control method of the diesel engine according to the embodiment of the present invention are characterized in that the cylinders 12, 14, 16 and 18 are provided with the CDA device 20, And the like.

In the drawings, the diesel engine 10 is shown to include four cylinders 12, 14, 16, 18, but is not limited thereto and may include all diesel engines, diesel engines, It is also applicable to hybrid engines.

The exhaust gas discharged from each of the cylinders 12, 14, 16 and 18 passes through the turbine 42 of the turbocharger 44 and is discharged through the post-treatment device 52 and the muffler 54.

The compressed air through the compressor 40 connected to the turbine 42 is cooled in the intercooler 50 and flows into the engine 10. [

Some of the exhaust gases discharged from the respective cylinders 12, 14, 16 and 18 may be introduced into the engine 10 together with the inflow air according to the operation of the EGR valve 56.

A diesel engine system to which a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention can be applied includes a boost pressure sensor 60 for measuring a boost pressure and outputting a corresponding signal, An EGR opening angle sensor 66 for measuring the EGR opening rate of the EGR valve 56 and outputting a corresponding signal, and an EGR opening angle sensor 66 for measuring the EGR opening rate of the EGR valve 56, A crank angle sensor 68 for measuring the engine speed and outputting the corresponding signal, an accelerator pedal opening angle sensor 70 for measuring the opening angle of the pedal and outputting the signal, And a cooling water temperature sensor 70. The corresponding signals output from the respective sensors are input to the controller 80. [

The controller 80 controls the operation of the CDA device 20 and the injectors 32, 34, and 34 based on the output signals of the sensors, the operation mode of the current CDA device input to the memory 90, 36, and 38, respectively.

FIG. 3 is a flowchart illustrating a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention, and FIG. 4 is a graph illustrating a change in the operation mode of the CDA according to an embodiment of the present invention.

Hereinafter, a CDA apparatus and a fuel injection control method of a diesel engine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

The exhaust gas pressure sensor 62, the intake air amount sensor 64, the EGR opening angle sensor 66, the crank angle sensor 68, the exhalation pressure sensor 62, the EGR opening angle sensor 66, the crank angle sensor 68, The pedal opening degree, the engine speed, the excavator pedal opening angle, the cooling water temperature, the operating mode of the CDA device, the supercharging pressure, the exhaust pressure, the intake air amount, and the EGR opening rate output from the sensor 70, the cooling water temperature sensor 70, The controller 80 determines the current operating state of the vehicle based on the signal included in the received signal and determines whether the operating mode of the CDA device 20 needs to be changed.

For example, it is determined whether the operation mode of the CDA device 20 currently stored in the memory 90 is the normal mode (S20). If the operation mode of the CDA device 20 is the normal mode, It is determined whether the CDA mode is changed to the CDA mode (S30).

If the operation mode of the CDA device 20 is in the normal mode and the operation state of the current vehicle is not required to be changed to the CDA mode of the CDA device 20, the current operation mode is maintained (S50).

If the operating mode of the CDA device 20 is in the normal mode and the current operating state of the vehicle is to be changed to the CDA mode of the CDA device 20, the controller 80 outputs a CDA mode conversion command S32).

Then, the controller 80 determines a mode switching time (S34).

The mode switching time is determined according to the engine speed and the engine load at the time of determination, that is, at the time of entering the CDA mode transition section. Here, the engine load may be determined according to the opening degree of the accelerator pedal.

For example, the switching time may be approximately 5 seconds, but is not limited thereto.

The controller 80 determines the amount of fuel injected from each cylinder 12,14,16,18 and controls the injectors 32,34,36,38 for each cylinder to determine the mode switching time and the determined respective cylinder number The fuel injection amount of the cylinder to be stopped is decreased according to the injection fuel amount, and the fuel amount of the non-resting cylinder is increased (S36).

For example, the fuel injection amount of the first and fourth injectors 32 and 38 is increased and the fuel injection amount of the second and third injectors 34 and 36 is decreased.

The fuel injection quantity is set in advance in a map form according to the engine speed, the opening degree of the accelerator pedal, the cooling water temperature, the operating mode of the CDA device, the supercharging pressure, the exhaust pressure, the intake air amount, the EGR opening rate, .

The controller 80 determines whether the fuel injection amount of the stagnant cylinders, for example, the second and third cylinders 14 and 16 is less than a predetermined value (S38). If the fuel injection amount of the stagnant cylinder is less than the set value , The controller 10 starts the operation of the CDA device 20 of the idle cylinders 14 and 16 (S40). For example, actuates an actuator for cylinder stop. When the fuel is injected from the valve rest cylinder, the incompressible fluid is compressed, and damage to the valve, the piston, and the con rod may occur.

The set value may be experimentally determined to be a value at which torque fluctuation with respect to the stoppage of some cylinders can be minimized, and may be stored in the memory 90.

The controller 80 decreases the fuel injection amount of the cylinder to be stopped and increases the fuel amount of the cylinder that is not resting (S46).

The controller 80 determines whether or not the fuel injection amount of the stopped cylinder becomes "0" (S42), and when the fuel injection amount of the stopped cylinder becomes "0 ", the controller 80 determines that the current CDA apparatus operation Mode is recognized as the CDA mode (S44), and the current operation mode is stored in the memory 90. [

The sum of the final injected fuel quantities of the non-idle cylinders may be equal to the sum of the injected fuel quantities of the respective cylinders at the time when the controller outputs the CDA mode switching command. For example, the fuel injection amount of the second and fourth injectors 34, 36 may be about twice as large as before the mode conversion.

If it is determined that the operation mode of the current CDA device is the CDA mode and the controller 30 needs to change to the normal mode in step S60, And outputs a command (S62).

The controller 80 cancels the operation of the CDA device 80 of the idle cylinder (S64), and determines the mode switching time (S66).

The mode switching time is determined according to the engine speed and the engine load at the time of determination, that is, at the time of entering the normal mode transition section. Here, the engine load may be determined according to the opening degree of the accelerator pedal.

The controller 80 determines the amount of injected fuel for each cylinder and controls injectors 32, 34, 36, and 38 for each cylinder to calculate the amount of injected fuel of each cylinder based on the determined mode switching time and the determined injected fuel amount for each cylinder. The injection amount is increased, and the fuel amount of the non-resting cylinder is decreased (S68)

The controller 80 determines whether the fuel injection amounts of the cylinders are the same or not (S70). If the fuel injection amounts of the cylinders become equal to each other, the control unit 80 recognizes the operation mode of the current CDA apparatus 20 as the normal mode ), And the current operating mode is stored in the memory 90.

If the operation mode of the current CDA device is the CDA mode and the change to the normal mode is not required, the controller 80 maintains the operation mode of the current CDA device 20 (S80).

Hereinafter, a method for determining the amount of injected fuel for each cylinder will be described.

The controller 80 determines a brake torque according to the engine speed and the opening degree of the accelerator pedal. The brake torque may be an engine load or an engine output torque. Also, the brake torque may be stored in the memory 90 in the form of a map according to the engine speed and the opening angle of the pedal.

The controller 80 determines a friction torque for each cylinder according to the engine speed, the cooling water temperature, and the operating mode of the CDA device 20 for each cylinder. The friction torque may be stored in the memory 90 in the form of a map according to the engine speed, the cooling water temperature, and the operating mode of the CDA device 20 for each cylinder.

The controller 80 determines the net indicated torque for each cylinder by the sum of the brake torque and the friction torque.

The controller 80 determines the pumping loss of each cylinder according to the boost pressure, the exhaust pressure, and the operating mode of the CDA device 20. [ As shown in FIG. 4, the pumping loss of the cylinder being stalled increases with the operation of the CDA apparatus 20. FIG.

The pumping loss may be stored in the memory 90 in the form of a map according to the boost pressure, the exhaust pressure, and the operating mode of the CDA device 20. [

The controller 80 determines a gross indicated torque of each cylinder according to the net indicative torque of each cylinder and the pumping loss of each cylinder.

The controller 80 determines the efficiency of each cylinder according to the engine speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the operating mode of the CDA device 20 ). As shown in Fig. 4, the efficiency of the idle cylinder becomes "0 ".

Wherein the efficiency is determined based on the engine rotational speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the map according to the operating mode of the CDA device (20) Lt; / RTI >

The controller 80 determines the injection fuel amount per cylinder by dividing the gross indicative torque of each cylinder by the efficiency of each cylinder.

The operation of each step of the CDA device 20 and each of the injectors 32, 34, 36, and 38 will be described below with reference to FIG. In step (1), the controller 80 outputs a command to switch the operation mode of the CDA device 20 from the normal mode to the CDA mode.

In step 2, the mode switching process of the CDA apparatus 20 is started. The controller 80 controls the operation of each of the injectors 32, 34, 36, and 38 according to the mode switching time and the amount of fuel injected by each cylinder . Here, the net indicative torque for each cylinder during the switching time can be linearly controlled.

If the injected fuel amount of the stagnant cylinder is less than the set value, the controller 80 operates the actuator or the like for operating the CDA apparatus 20 of the stagnant cylinder, and continuously reduces the fuel injection amount of the stagnant cylinder , The fuel amount of the non-resting cylinder is continuously increased.

If the injected fuel amount of the cylinder stopped in step " 4 "is" 0 ", the controller 80 recognizes that the CDA mode switching is completed.

In step 5, when the controller 80 outputs a command to switch the operation mode of the CDA device 20 from the CDA mode to the normal mode, the operation of the CDA device 20 is released, 80 determines the mode switching time, determines the injection fuel amount for each cylinder, and controls the injector for each cylinder to increase the fuel injection amount of the idle cylinder according to the determined mode switching time and the determined injection fuel amount for each cylinder, Thereby reducing the amount of fuel in the non-resting cylinder.

When the operation of the CDA apparatus 20 of the cylinders stopped in step 6), for example, the cylinders 14 and 16 of the second and third cylinders 14 and 16 is released and the fuel injection quantity of each cylinder becomes equal in step 7, ) Will recognize that mode switching is complete.

As described above, when changing from the normal mode to the CDA mode, the amount of fuel is controlled and the valve is shut down to prevent breakage of valves, pistons, etc., and engine vibration and torque shocks are suppressed.

When changing from the CDA mode to the normal mode, the valve is operated first, then the fuel amount is changed to suppress engine vibration and torque shock.

Further, when changing the amount of fuel, it is possible to determine the amount of fuel in consideration of whether or not the pumping loss due to the valve stop / operation and the efficiency change of the operating cylinder are taken into account, so that the variation of the output torque of the engine can be minimized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: engine 12, 14, 16, 18: first to fourth cylinders
20: CDA device 32, 34, 36, 38: first to fourth injectors
40: compressor 42: turbine
44: turbocharger 50: intercooler
52: Post-processing apparatus 54: muffler
56: EGR valve 60: boost pressure sensor
62: exhaust pressure sensor 66: EGR opening sensor
64: intake air amount sensor 68: crank angle sensor
70: Excel pedal opening angle sensor 72: Cooling water temperature sensor
80: controller 90: memory

Claims (18)

A CDA apparatus and a fuel injection control method for a diesel engine equipped with a CDA apparatus capable of stopping a valve of a part of cylinders of an engine,
Obtaining a signal including an engine speed, an accelerator pedal opening angle, a cooling water temperature, an operating mode of the CDA device, a supercharging pressure, an exhaust pressure, an intake air amount, and an EGR opening rate to determine a current operating state of the engine;
Determining whether the controller needs to change the operating mode of the CDA device;
Outputting a CDA mode switching command when the operating mode of the CDA device is in a normal mode and a change to a CDA mode is required;
The controller determining a mode switching time;
The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to decrease the fuel injection amount of the stopped cylinder according to the determined mode change time and the determined injected fuel amount for each cylinder, ; And
The controller initiating operation of the CDA device of the idle cylinder if the fuel injection amount of the idle cylinder is less than a predetermined value;
And a fuel injection control method of the diesel engine. The method of claim 1,
Recognizing the current operating mode of the CDA device as the CDA mode when the fuel injection amount of the idle cylinder becomes "0 ";
And a fuel injection control means for controlling the fuel injection control means. 3. The method of claim 2,
And the sum of the final injected fuel quantities of the non-idle cylinders is equal to the sum of the injected fuel quantities of the respective cylinders at the time when the controller outputs the CDA mode switching command. The method of claim 1,
Wherein the mode switching time is determined according to the engine speed and the opening angle of the pedal at the time of determination. The method of claim 1,
The injection fuel amount per cylinder
A brake torque determined according to the engine speed and the opening degree of the accelerator pedal;
A friction torque for each cylinder determined according to the engine speed, the cooling water temperature, and the operating mode of the CDA device for each cylinder;
A net indicated torque for each cylinder determined by a sum of the brake torque and the friction torque;
A pumping loss of each cylinder determined according to the boost pressure, the exhaust pressure, and the operating mode of the CDA apparatus;
A gross indicated torque of each cylinder determined according to the netindicate torque of each cylinder and the pumping loss of each cylinder; And
An efficiency of each cylinder determined according to the engine speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the operating mode of the CDA device;
And a fuel injection control method of the diesel engine. The method of claim 5,
Wherein the injected fuel amount for each cylinder is determined as a value obtained by dividing the gross indicative torque of each cylinder by the efficiency of each cylinder. The method of claim 1,
Maintaining the current operating mode of the CDA device when the current operating mode of the CDA device is the normal mode and the change to the CDA mode is not required;
And a fuel injection control means for controlling the fuel injection control means. The method of claim 1,
If the current operating mode of the CDA device is the CDA mode and the change to the normal mode is required, the controller outputs a normal mode switching command;
The controller deactivating the CDA device of the idle cylinder;
The controller determining a mode switching time;
The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to increase the fuel injection amount of the idle cylinder according to the determined mode switching time and the determined injection fuel amount for each cylinder, ; And
The controller recognizing the current operating mode of the CDA device as the normal mode when the fuel injection amount of each cylinder becomes equal;
And a fuel injection control means for controlling the fuel injection control means. The method of claim 1,
Maintaining the current operating mode of the CDA device if the current operating mode of the CDA device is the CDA mode and the change to the normal mode is not required;
And a fuel injection control means for controlling the fuel injection control means. A CDA apparatus and a fuel injection control method for a diesel engine equipped with a CDA apparatus capable of stopping a valve of a part of cylinders of an engine,
Obtaining a signal including an engine speed, an accelerator pedal opening angle, a cooling water temperature, an operating mode of the CDA device, a supercharging pressure, an exhaust pressure, an intake air amount, and an EGR opening rate to determine a current operating state of the engine;
Determining whether the controller needs to change the current operating mode of the CDA device;
Outputting a normal mode switching command if the current operating mode of the CDA device is a CDA mode and a change to a normal mode is required;
The controller deactivating the CDA device of the idle cylinder;
The controller determining a mode switching time;
The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to increase the fuel injection amount of the idle cylinder according to the determined mode switching time and the determined injection fuel amount for each cylinder, ; And
The controller recognizing the current operating mode of the CDA device as the normal mode when the fuel injection amount of each cylinder becomes equal;
And a fuel injection control method of the diesel engine. 11. The method of claim 10,
Wherein the mode switching time is determined according to the engine speed and the opening angle of the pedal at the time of determination. 11. The method of claim 10,
The injection fuel amount per cylinder
A brake torque determined according to the engine speed and the opening degree of the accelerator pedal;
A friction torque for each cylinder determined according to the engine speed, the cooling water temperature, and the operating mode of the CDA device for each cylinder;
A net indicated torque for each cylinder determined by a sum of the brake torque and the friction torque;
A pumping loss of each cylinder determined according to the boost pressure, the exhaust pressure, and the operating mode of the CDA apparatus;
A gross indicated torque of each cylinder determined according to the netindicate torque of each cylinder and the pumping loss of each cylinder; And
An efficiency of each cylinder determined according to the engine speed, the gross indicative torque of each cylinder, the cooling water temperature, the intake air amount, the EGR opening rate, and the operating mode of the CDA device;
And a fuel injection control method of the diesel engine. The method of claim 12,
Wherein the injected fuel amount for each cylinder is determined as a value obtained by dividing the gross indicative torque of each cylinder by the efficiency of each cylinder. The method of claim 12,
Outputting a CDA mode switching command if the current operating mode of the CDA device is in a normal mode and a change to the CDA mode is required;
The controller determining a mode switching time;
The controller determines the injection fuel amount for each cylinder and controls the injector for each cylinder to decrease the fuel injection amount of the stopped cylinder according to the determined mode change time and the determined injected fuel amount for each cylinder, ; And
The controller initiating operation of the CDA device of the idle cylinder if the fuel injection amount of the idle cylinder is less than a predetermined value;
And a fuel injection control means for controlling the fuel injection control means. The method of claim 14,
Recognizing the current operating mode of the CDA device as the CDA mode when the fuel injection amount of the idle cylinder becomes "0 ";
And a fuel injection control means for controlling the fuel injection control means. 16. The method of claim 15,
And the sum of the final injected fuel quantities of the non-idle cylinders is equal to the sum of the injected fuel quantities of the respective cylinders at the time when the controller outputs the CDA mode switching command. 11. The method of claim 10,
Maintaining the current operating mode of the CDA device when the current operating mode of the CDA device is the normal mode and the change to the CDA mode is not required;
And a fuel injection control means for controlling the fuel injection control means. 11. The method of claim 10,
Maintaining the current operating mode of the CDA device if the current operating mode of the CDA device is the CDA mode and the change to the normal mode is not required;
And a fuel injection control means for controlling the fuel injection control means.
KR1020150176036A 2015-12-10 2015-12-10 Control method for cda apparatus and fuel injection of diesel engine KR101744823B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013231412A (en) 2012-05-01 2013-11-14 Isuzu Motors Ltd Diesel engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013231412A (en) 2012-05-01 2013-11-14 Isuzu Motors Ltd Diesel engine

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