KR20230064125A - Apparatus and method for detecting opening time of injection nozzle of injector - Google Patents

Abstract

Disclosed is an injector injection nozzle opening timing detection apparatus. The injector injection nozzle opening timing detection apparatus of the present invention comprises: an injector control unit which applies an electrical energy to an injector so that an injector injection nozzle injects a fuel by a preset fuel injection amount; a motor rotation speed change amount detection unit which detects a motor rotation speed change amount caused by a change in an engine torque due to the electrical energy; and a learning unit which learns the opening timing of the injector injection nozzle based on the motor rotation speed change amount. Provided are the injector injection nozzle opening timing detection apparatus, which detects the opening timing of the injector based on the motor rotation speed change amount, and a method thereof.

Description

Apparatus and method for detecting injector injection nozzle opening time {APPARATUS AND METHOD FOR DETECTING OPENING TIME OF INJECTION NOZZLE OF INJECTOR}

The present invention relates to an apparatus and method for detecting an injector injection nozzle opening timing, and more particularly, to generate engine torque by applying electrical energy to an injector during regenerative braking control in a coasting section, and to generate engine torque, thereby generating a motor speed. An apparatus and method for detecting an injector opening timing based on a change in an injector injection nozzle opening timing.

Fuel injection injectors require precise control to keep the required injection amount as accurately as possible.

In order to perform accurate injection control using an injector, it is necessary to accurately detect the exact opening timing of the injection nozzle of the injector.

In order to detect the opening timing of the injector, conventionally, a change in fuel pressure according to the opening of an injector needle or an electrical signal is used.

However, in the method of judging by using the change in fuel pressure according to the opening of the injector needle, the opening time can be detected only when sufficient fuel pressure is formed and the fuel pressure drop at a level that can be confirmed with discrimination occurs when the injector needle is opened. In addition, this method cannot help but expect only a partial effect in common rail diesel using a high pressure of 2000 bar or more, and it is difficult to expect an effect in MPI and GDI gasoline fuel injection methods with relatively low fuel pressure.

In addition, the method using an electrical signal has problems in that it is difficult to process noise of an electrical signal compared to a complicated processing process through software, the opening time is inaccurate, and correction must be performed.

The background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2004-0041798 (published on May 20, 2004, needle valve lift adjustment device of injector hydraulic flow rate measurement device).

The present invention has been devised to improve the above problems, and an object according to an aspect of the present invention is to generate engine torque by applying electric energy to an injector when controlling regenerative braking in a coasting section, and An apparatus and method for detecting an open timing of an injector injection nozzle for detecting an open timing of an injector based on a change in motor rotation speed.

An apparatus for detecting an injector injection nozzle open time according to an aspect of the present invention includes an injector control unit for applying electric energy to an injector so that an injector injection nozzle injects fuel by a preset fuel injection amount; a motor rotational speed change detection unit for detecting a motor rotational speed change amount generated by a change in engine torque by the electrical energy; and a learning unit that learns an opening time of an injector injection nozzle based on the amount of rotation of the motor.

The injector control unit of the present invention is characterized in that it determines whether learning is possible when controlling the motor regenerative braking in the coasting section of the vehicle.

The injector control unit of the present invention is characterized in that it determines whether learning is possible for the opening timing of the injector injection nozzle according to the number of revolutions of the motor.

The injector controller of the present invention may determine that the injector spray nozzle opening timing can be learned when the motor rotation speed is equal to or greater than a preset rotation speed.

The injector control unit of the present invention may increase the amount of fuel injected through the injector injection nozzle by gradually increasing the electric energy according to whether the change in motor rotation speed is less than a preset value.

The injector control unit of the present invention may determine that the injector is out of order when the electrical energy exceeds a predetermined failure diagnosis range and the change in motor rotational speed is less than the set value.

The learning unit of the present invention is characterized in that the timing when the change in motor rotation speed is greater than or equal to a predetermined set value is determined as the opening timing of the injection nozzle of the injector.

The learning unit of the present invention is characterized in that the learning unit stores a value of the electric energy at a point in time when the change in number of revolutions of the motor is greater than or equal to the set value as a learning value.

The set fuel injection amount of the present invention is characterized in that the minimum amount of fuel that can be injected through the injector injection nozzle.

A method for detecting an open timing of an injector spray nozzle according to an aspect of the present invention includes determining whether an injector controller can learn about an open timing of an injector spray nozzle when controlling regenerative braking of a motor in a coasting section of a vehicle; applying electrical energy to the injector so that the injector injection nozzle injects fuel by a preset fuel injection amount according to a result of the injector control unit determining whether the learning is possible; detecting, by a motor rotation speed variation detection unit, a motor rotation speed variation generated by a change in engine torque by the electric energy; and learning, by a learning unit, an opening timing of the injection nozzle of the injector based on the amount of rotation of the motor.

In the step of determining whether or not learning is possible, the injector control unit determines that learning about the open timing of the injector injection nozzle is possible if the number of revolutions of the motor is greater than or equal to a preset number of revolutions.

In the step of applying the electrical energy of the present invention, the injector control unit increases the amount of fuel injected through the injector injection nozzle by gradually increasing the electrical energy according to whether the change in motor rotation speed is less than a preset value. to be characterized

In the step of applying the electric energy of the present invention, the injector control unit determines that the injector is out of order when the electric energy exceeds a predetermined fault diagnosis range and the change in motor rotational speed is less than the set value. .

In the step of learning the opening timing of the injector spray nozzle according to the present invention, the learning unit determines a time point when the change in motor rotation speed is equal to or greater than a preset value as the opening timing of the injector spray nozzle.

In the step of learning the opening timing of the injection nozzle of the injector of the present invention, the learning unit stores a value of the electric energy at a point in time when the change in motor revolution speed is equal to or greater than the set value as a learning value.

An apparatus and method for detecting an injector injection nozzle opening time according to an aspect of the present invention have few limitations on injector hardware and can perform correction and learning without installing additional sensors such as a knocking sensor, so that in a vehicle with a 48V mild hybrid system Applicable to various injector types.

An apparatus and method for detecting an injector injection nozzle opening time according to another aspect of the present invention can inject an accurate fuel injection amount through correction of the minimum fuel injection amount of an injector, thereby reducing exhaust gas and increasing fuel efficiency through accurate fuel injection. can

An apparatus and method for detecting an injector injection nozzle opening time according to another aspect of the present invention corrects and learns a fuel injection amount that changes according to the progress of an injector's durability so that the fuel injection amount of an injector can be maintained constant, thereby fuel injection amount according to the progress of the durability. Deviations can be corrected.

An apparatus and method for detecting an injector injection nozzle opening time according to another aspect of the present invention perform fault diagnosis for a single injector based on whether or not normal fuel injection exceeds a level determined to be impossible when electric energy is increased to check the minimum fuel injection amount of an injector. can do.

1 is a block configuration diagram of an apparatus for detecting an injector injection nozzle opening time according to an embodiment of the present invention.
2 is a flowchart of a method for detecting an injector injection nozzle opening time according to an embodiment of the present invention.

Hereinafter, an apparatus and method for detecting an injector injection nozzle opening time according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is a block configuration diagram of an apparatus for detecting an injector injection nozzle opening time according to an embodiment of the present invention.

Referring to FIG. 1 , an apparatus for detecting an injector injection nozzle opening time according to an embodiment of the present invention includes an injector control unit 100, a motor rotation speed variation detection unit 200, and a learning unit 300.

The injector control unit 100 determines whether or not it is possible to learn about the opening timing of the injector injection nozzle when controlling the regenerative braking of the motor in the coasting section of the vehicle.

When it is determined that learning about the injector injection nozzle opening timing is possible, the injector control unit 100 generates engine torque by applying electric energy to the injector 10 so that the injector injection nozzle injects fuel by a preset fuel injection amount.

The injector 10 is installed in an engine using fuel such as gasoline or diesel and injects fuel into the engine through an injection nozzle. The injector 10 injects the high-pressure fuel delivered from the injection pump in the form of a fine mist.

The structure and injection method of the injector 10 are not particularly limited, and as described above, any injector can be employed as long as it is installed in an internal combustion engine and can inject fuel.

The coasting is continuous driving by coasting without outputting driving force, and means driving in a state in which the accelerator pedal and the brake pedal are not operated.

Therefore, the injector controller 100 may determine whether the vehicle is coasting based on signals from an accelerator position sensor (APS) that detects the position of the accelerator pedal and a brake position sensor (BPS) that detects the position of the brake pedal. .

The injector control unit 100 may determine that the vehicle is coasting when the signal of the APS or BPS is off, for example, when the driver does not operate the accelerator pedal and the brake pedal.

The motor regenerative braking control in the coasting section of the vehicle is a control for recovering kinetic energy of the vehicle as electric energy through the motor 20 during coasting.

The motor 20 may be a 48V motor, but the type of the motor 20 is not particularly limited.

In general, the rotational speed of a 48V motor is 2 to 3 times higher than the engine rotational speed. During coasting, the engine speed is 1500 to 2000 rpm, and the motor speed of the 48V motor is 3000 to 6000 rpm, which is higher than the engine speed.

When electric energy for minimum opening of an injector injection nozzle is applied to the injector 10 during coasting, engine torque is generated in the engine.

As the engine torque is generated, the engine speed changes, and this change in engine speed can be accurately grasped through a 48V motor proportionally connected to the engine speed.

Therefore, the injector control unit 100 determines whether or not learning about the opening timing of the injector spray nozzle is possible when controlling the regenerative braking of the motor in the coasting section of the vehicle based on whether the motor rotation speed is equal to or greater than the preset rotation number. can

The injector controller 100 determines that learning about the opening timing of the injection nozzle of the injector is possible when the number of revolutions of the motor is equal to or greater than the set number of revolutions.

The set number of rotations is the number of rotations of the motor as a criterion for determining whether learning about the opening timing of the injection nozzle of the injector is possible. The set number of rotations may be set to 5000 to 6000 rpm. When the motor rotation speed is less than 2000 rpm, it is impossible to learn about the opening timing of the injector injection nozzle.

When it is determined that learning about the opening timing of the injector injection nozzle is possible, the injector control unit 100 applies electrical energy to the injector 10 so that the injector injection nozzle injects fuel as much as the set fuel injection amount into the engine.

The set fuel injection amount is the minimum amount of fuel that can be injected through the injector injection nozzle. The minimum amount of fuel that can be injected through the injector injection nozzle may be different depending on the type or operation characteristics of the injector 10 or manufacturer, and is not particularly limited.

When the injector 10 injects fuel by electric energy applied from the injector control unit 100, the engine is driven to generate engine torque, and engine rotation speed is changed by the generation of engine torque.

In this case, the injector control unit 100 increases the electrical energy step by step to reduce the amount of fuel supplied to the engine when the change in motor rotational speed does not occur or the level of determination is not reached despite the application of electrical energy to the injector 10. increase During this process, if the electric energy exceeds a predetermined fault diagnosis range, the injector controller 100 determines that a fault has occurred in the injector 10 .

The fault diagnosis range is a range of electrical energy that is a criterion for determining failure of the injector 10 .

The motor rotation speed variation detection unit 200 detects the motor rotation speed variation generated according to the generation of engine torque by electric energy.

The motor 20 is proportionally connected to the engine. Therefore, when the engine torque is generated and the engine speed changes, the motor speed also changes in proportion to the engine speed. Therefore, when fuel is injected into the engine as much as the set fuel injection amount by the electric energy applied from the injector control unit 100, the engine speed is also changed due to the generation of engine torque, and this change in engine speed is a change in motor speed. appears as

Accordingly, the motor rotation speed variation detection unit 200 can detect the motor rotation speed variation according to the generation of engine torque.

The learning unit 300 learns the opening timing of the injection nozzle of the injector based on the amount of rotation of the motor.

The learning unit 300 may determine a time when the change in motor rotation speed is equal to or greater than a preset value as the opening time of the injection nozzle of the injector.

The set value is the amount of change in motor revolutions that is the criterion for judging that the injector injection nozzle is open due to electric energy.

That is, if the change in motor revolution speed is greater than or equal to the set value, it may be determined that the actual injector injection nozzle is open. More specifically, when electric energy is applied and fuel is injected, engine torque is generated. The generation of engine torque appears as a change in the number of revolutions of the motor. Accordingly, when the change in motor revolution speed exceeds the set value, it may be determined that the injector injection nozzle is open so that fuel can be injected.

Accordingly, the learning unit 300 may detect the opening timing of the injection nozzle of the injector based on whether the change in motor rotation speed is greater than or equal to the set value.

Accordingly, the learning unit 300 determines that the injector injection nozzle is open (detects the opening time) when the change in motor rotation speed is greater than the set value, and stores the value of electric energy at this point as a learning value to learn.

When the change in motor rotation speed is less than the set value, the injector control unit 100 may increase the electrical energy step by step as described above. In this process, when the electrical energy exceeds the fault diagnosis range, the injector control unit 100 determines that a fault has occurred in the injector 10 .

Hereinafter, a method for detecting an injector injection nozzle open time according to an embodiment of the present invention will be described in detail with reference to FIG. 2 .

2 is a flowchart of a method for detecting an injector injection nozzle opening time according to an embodiment of the present invention.

Referring to FIG. 2 , in a state in which the vehicle enters the motor regenerative braking mode in the coasting section (S10), the injector control unit 100 determines whether learning about the opening timing of the injector injection nozzle is possible (S20).

The injector control unit 100 determines whether or not learning about the opening timing of the injection nozzle of the injector is possible based on whether the number of rotations of the motor is greater than or equal to the set number of rotations.

The injector control unit 100 determines that learning about the opening timing of the injector injection nozzle is possible if the motor rotation speed is greater than the set rotation number, and determines that learning about the opening timing of the injector injection nozzle is impossible if the motor rotation speed is less than the predetermined rotation number. do.

As a result of the determination in step S20, if it is determined that learning about the opening timing of the injector injection nozzle is possible, the injector control unit 100 controls the injector to inject fuel as much as the set fuel injection amount, that is, the minimum amount of fuel that can be injected through the injector injection nozzle ( 10) to apply electrical energy (S30).

When the injector 10 injects fuel according to the electric energy applied from the injector control unit 100, the engine is driven and engine torque is generated, and engine rotation speed is changed due to the generation of engine torque (S40).

As the engine speed changes, the motor speed also changes, and at this time, the motor speed change amount detection unit 200 detects the motor speed change amount according to the generation of engine torque by electric energy (S50).

When the engine torque is generated and the engine speed changes, the motor speed also changes in proportion to the engine speed. Accordingly, the motor rotation speed variation detection unit 200 can detect the motor rotation speed variation according to the generation of engine torque.

The learning unit 300 determines whether the motor rotation speed variation detected by the motor rotation speed variation detection unit 200 is greater than or equal to a set value (S60).

As a result of the determination in step S60, if the change in motor revolutions is greater than or equal to the set value, the learning unit 300 stores the value of electric energy at the current time when the change in motor revolutions is equal to or greater than the set value as a learning value and learns (S90) .

On the other hand, as a result of the determination at step S60, if the change in motor revolution speed is less than the set value, the injector control unit 100 increases the electrical energy step by step (S70).

At this time, the injector controller 100 determines whether the electrical energy increased in step S70 exceeds the fault diagnosis range (S80).

As a result of the determination in step S80, if the electrical energy is within the diagnostic range, the process is returned to step S40 to perform subsequent processes. It is determined that a failure has occurred in (10) (S100).

As such, the apparatus and method for detecting the opening timing of the injector injection nozzle according to an embodiment of the present invention have few limitations on the injector hardware and can perform correction and learning without installing additional sensors such as knocking sensors, so that the 48V mild hybrid system It can be applied to various injector types in the vehicle to which this is applied.

In addition, an apparatus and method for detecting an injector injection nozzle opening timing according to an embodiment of the present invention can inject an accurate fuel injection amount through correction of the minimum fuel injection amount of an injector, thereby reducing exhaust gas and fuel efficiency through accurate fuel injection. can increase

In addition, an apparatus and method for detecting an injector injection nozzle opening time according to an embodiment of the present invention corrects and learns the fuel injection amount that changes according to the progress of the injector's durability so that the fuel injection amount of the injector can be maintained constant. The fuel injection amount deviation can be corrected.

In addition, an apparatus and method for detecting an injector injection nozzle opening timing according to an embodiment of the present invention diagnoses a failure of a single injector based on whether or not normal fuel injection exceeds a level determined to be impossible when electric energy is increased for checking the minimum fuel injection amount of an injector. can be performed.

Implementations described herein may be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiments shown in the drawings, it should be noted that this is only exemplary and various modifications and equivalent other embodiments are possible from those skilled in the art to which the technology pertains. will understand Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: injector 20: motor
100: injector control unit 200: motor rotational speed variation detection unit
300: learning unit

Claims (15)

an injector controller for applying electric energy to the injector so that the injector injection nozzle injects fuel by a preset fuel injection amount;
a motor rotational speed change detection unit for detecting a motor rotational speed change amount generated by a change in engine torque by the electrical energy; and
An injector injection nozzle open time detection device comprising a learning unit configured to learn an open time of an injector injection nozzle based on a change in motor rotation speed. The method of claim 1, wherein the injector control unit
An apparatus for detecting an open timing of an injector injection nozzle, characterized in that it determines whether learning is possible during motor regenerative braking control in a coasting section of a vehicle. The method of claim 2, wherein the injector control unit
An apparatus for detecting an open time of an injector injection nozzle, characterized in that it determines whether or not learning of the open time of the injector injection nozzle is possible according to the number of revolutions of the motor. The method of claim 3, wherein the injector control unit
The injector injection nozzle open time detection device, characterized in that it is determined that learning about the open time of the injector injection nozzle is possible when the motor rotation speed is equal to or greater than a preset rotation number. The method of claim 1, wherein the injector control unit
The injector injection nozzle open time detection device, characterized in that the amount of fuel injected through the injector injection nozzle is increased by gradually increasing the electric energy according to whether the change in motor rotation speed is less than a preset value. The method of claim 5, wherein the injector control unit
The injector injection nozzle open time detection device of claim 1 , wherein the injector is determined to be faulty when the electrical energy exceeds a predetermined fault diagnosis range and the change in motor rotation speed is less than the set value. The method of claim 1, wherein the learning unit
An injector injection nozzle open time detection device, characterized in that determining a time point when the change in motor rotation speed is equal to or greater than a preset value as the open time of the injector injection nozzle. The method of claim 7, wherein the learning unit
The injector injection nozzle open time detection device, characterized in that for storing the value of the electric energy at a time when the change in motor rotation speed is equal to or greater than the set value as a learning value. The method of claim 1, wherein the set fuel injection amount
An injector injection nozzle open time detection device, characterized in that the minimum amount of fuel that can be injected through the injector injection nozzle. determining, by an injector control unit, whether learning is possible for an opening time of an injector injection nozzle when controlling regenerative braking of a motor in a coasting section of a vehicle;
applying electric energy to the injector so that the injector injection nozzle injects fuel by a preset fuel injection amount according to a result of the injector control unit determining whether the learning is possible;
detecting, by a motor rotation speed variation detection unit, a motor rotation speed variation generated by a change in engine torque by the electric energy; and
and learning, by a learning unit, the opening timing of the injector spray nozzle based on the amount of rotation of the motor. The method of claim 10, wherein in the step of determining whether learning is possible,
Wherein the injector control unit determines that the injector injection nozzle open time can be learned when the motor rotation speed is equal to or greater than a preset rotation number. 11. The method of claim 10, wherein in the step of applying the electrical energy,
Wherein the injector control unit increases the amount of fuel injected through the injector injection nozzle by stepwise increasing the electric energy according to whether the change in motor rotation speed is less than a preset value. The method of claim 12, wherein in the step of applying the electrical energy,
Wherein the injector control unit determines that the injector is out of order when the electric energy exceeds a predetermined failure diagnosis range and the change in motor rotation speed is less than the set value. The method of claim 10, wherein in the step of learning the opening timing of the injector injection nozzle,
The method of detecting an open time of an injector injection nozzle, characterized in that the learning unit determines a time point when the change in motor rotation speed is equal to or greater than a preset value as the open time of the injector injection nozzle. The method of claim 14, wherein in the step of learning the opening timing of the injector injection nozzle,
Wherein the learning unit stores a value of the electric energy at a time when the change in motor rotation speed is equal to or greater than the set value as a learning value.

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