JP2016166585A - Control device for throttle valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a throttle valve capable of improving controllability.SOLUTION: The control device for a throttle valve includes opening and closing means for opening and closing a throttle valve, a throttle opening sensor for detecting the degree of opening of the throttle valve, fuel supply control means for controlling supply of fuel, engine speed acquiring means for acquiring engine speed of an internal combustion engine, load acquiring means for acquiring a load of the internal combustion engine, target engine speed setting means for setting target engine speed of the internal combustion engine, and throttle opening control means for controlling the opening and closing means and controlling the degree of opening of the throttle valve so that, in the case where the fuel is supplied, the acquired engine speed becomes the set engine speed when both of a condition that the acquired engine speed is equal to or lower than prescribed engine speed and the internal combustion engine is in the low rotation state and a condition that the acquired load is equal to or lower than a prescribed load and the internal combustion engine is in the low load state are satisfied.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a control device for a throttle valve.

  Conventionally, there has been proposed a technique for controlling the opening of a throttle valve provided in an intake passage of an internal combustion engine based on an opening deviation between a sensor opening detected by a throttle opening detecting means and a target opening ( For example, see Patent Document 1). According to this technique, the opening degree of the throttle valve can be controlled with good responsiveness.

JP 2012-159045 A

  By the way, the target opening of the throttle valve is set based on the fully closed opening. However, since the fully closed opening of the throttle valve is learned using the detected value of the throttle opening sensor when the throttle valve is in contact with the stopper, an error caused by the stopper distortion is included in the learned value. included. The learning value includes a detection error caused by a temperature change of a throttle opening sensor made of a semiconductor, a reading error of a CPU incorporated in an ECU, and an error caused by a drive gear of an opening / closing mechanism that opens and closes a throttle valve. And various learning errors.

  Therefore, in the technique of Patent Document 1 in which the opening degree of the throttle valve is controlled using the target opening degree that is set based on the fully closed opening degree that is learned including a learning error, the opening degree of the throttle valve is fully closed and opened. There was a possibility that the idle state could not be sufficiently secured during the idle operation controlled near the degree. In particular, when the fully closed opening degree is learned by shifting from the stopper position to the closing side, the minimum rotational speed of the internal combustion engine cannot be ensured in a low rotation low load state such as during idle operation, There was a risk of engine stall.

  The present invention has been made in view of the above, and an object of the present invention is to provide a throttle valve control device with improved controllability compared to the conventional art.

  In order to achieve the above object, the present invention provides an opening degree of a throttle valve (for example, a throttle valve 5 described later) provided in an intake passage (for example, an intake pipe 11 described later) of an internal combustion engine (for example, an engine 1 described later). A throttle valve control device (for example, a control device 2 described later) that controls the opening / closing means (for example, an opening / closing mechanism 8 and ECU 6 described later) for opening and closing the throttle valve by an actuator (for example, a motor 7 described later). And a throttle opening sensor (for example, a throttle opening sensor 9 described later) for detecting the opening of the throttle valve, and a fuel supply control means (for example, a fuel injection valve 1a described later) for controlling fuel supply to the engine. , Means relating to execution of fuel injection control processing of the ECU 6) and rotation speed acquisition means for acquiring the rotation speed of the engine (for example, a crank angle sensor 91, EC described later) 6), load acquisition means for acquiring the load of the engine (for example, means for executing the load acquisition process of the intake pressure sensor 92 and ECU 6 described later), In the case where fuel is supplied to the engine by target rotational speed setting means (for example, means related to execution of target rotational speed setting processing of ECU 6 described later) for setting the target rotational speed, and the fuel supply control means, The rotational speed acquired by the rotational speed acquisition means is equal to or lower than a predetermined rotational speed and the engine is in a low rotational state, and the load acquired by the load acquisition means is equal to or lower than a predetermined load and the engine is in a low load state. If both of these requirements are satisfied, the opening / closing means is set so that the rotational speed acquired by the rotational speed acquisition means becomes the target rotational speed set by the target rotational speed setting means. Throttle opening control means for controlling an opening degree of the throttle valve to control (e.g., the means related to execution of the throttle opening control process ECU6 below) to provide a control apparatus of a throttle valve provided with a.

In the present invention, when the internal combustion engine in the combustion state in which fuel is being supplied satisfies both the low rotation state and the low load state, the rotation speed acquired by the rotation speed acquisition means is the target rotation. The opening / closing means is controlled to control the opening degree of the throttle valve so that the target rotational speed set by the number setting means is obtained. That is, in a low rotation and low load state such as during idling, the internal combustion engine speed is set to the target rotational speed without using feedback control based on the opening detected by the throttle opening sensor and the target opening. The throttle valve opening is controlled.
Therefore, according to the present invention, the rotational speed of the internal combustion engine can be obtained with high accuracy without using the target opening set based on the fully closed opening learned with a learning error as in the prior art. Since the opening degree of the throttle valve is controlled, it can be controlled with high accuracy and controllability is improved. In addition, since the opening of the throttle valve is controlled so that the rotational speed of the internal combustion engine becomes the target rotational speed, the idle state can be sufficiently secured during idle operation, and the internal combustion engine can be operated in a low rotation and low load state such as during idle operation. The minimum number of revolutions can be reliably ensured, and the occurrence of engine stalls can be reliably avoided.

  Further, in this case, further comprising target opening setting means (for example, means relating to execution of target opening setting processing of ECU 6 described later) for setting the target opening of the throttle valve, When fuel is not supplied to the engine by the fuel supply control means, and when fuel is supplied to the engine by the fuel supply control means and any of the requirements is not satisfied, the throttle It is preferable that the opening degree of the throttle valve is controlled by controlling the opening / closing means so that the opening degree detected by the opening degree sensor becomes the target opening degree set by the target opening degree setting means.

In the present invention, when the fuel is not supplied at the time of fuel cut or when the internal combustion engine in the combustion state during the fuel supply is not in the low rotation and low load state, the sensor opening detected by the throttle opening sensor The opening degree of the throttle valve is controlled by controlling the opening / closing means so that becomes the target opening degree set by the target opening degree setting means. That is, in this case, as in the conventional case, the opening degree of the throttle valve is controlled so as to be the target opening degree using the sensor opening degree by the throttle opening degree sensor.
Therefore, according to the present invention, when there is no risk of engine stall as compared with a low rotation and low load state such as during idling, the throttle operation is switched by controlling the throttle opening using the sensor opening. Priority can be given to quick response to.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus of the throttle valve which improved controllability than before can be provided.

It is a figure which shows the structure of the engine which concerns on one Embodiment of this invention, and its control apparatus. It is a figure which shows the structure of a throttle valve. It is a flowchart which shows the procedure of the throttle opening degree control process which concerns on the said embodiment. It is a figure for demonstrating the throttle opening control process which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing the configuration of an internal combustion engine (hereinafter referred to as “engine”) 1 and its control device 2.

  As shown in FIG. 1, the engine 1 is provided with an intake pipe 11 through which intake air flows. The intake pipe 11 is connected to an intake port of each cylinder of the engine 1 through a plurality of branch portions of an intake manifold (not shown).

  A throttle valve 5 is provided in the intake pipe 11 of the engine 1 so as to be openable and closable. The throttle valve 5 is connected to an output shaft of a motor 7 as an actuator via an opening / closing mechanism 8. The opening / closing mechanism 8 is configured by meshing a plurality of gears, transmits the driving force generated by the motor 7 to the support shaft of the throttle valve 5, and opens / closes the throttle valve 5 in the intake pipe 11. The motor 7 is a DC motor, for example. The opening degree of the throttle valve 5 is controlled by adjusting the duty ratio of the drive current supplied from the battery (not shown) to the motor 7 by the ECU 6. Further, the amount of air introduced into the engine 1 is adjusted by controlling the opening degree of the throttle valve 5.

  FIG. 2 is a diagram showing the configuration of the throttle valve 5. As shown in FIG. 2, the throttle valve 5 is provided with a valve-opening spring 5a and a valve-closing spring 5b as urging means for urging the throttle valve 5 toward the opening side and the closing side, respectively. The two springs 5a and 5b are configured such that the biasing force of the valve closing side spring 5b is larger than the biasing force of the valve opening side spring 5a. Therefore, in a state where the motor 7 is not driven (duty ratio = 0 [%]), the throttle valve 5 has a default opening slightly opened from the fully closed opening in which the urging forces of these two springs 5a and 5b are balanced. Maintained.

  Further, the intake pipe 11 is provided with a stopper 5c that restricts the displacement of the throttle valve 5 toward the closing side by a predetermined opening degree. In the following description, the minimum opening of the throttle valve 5 in a state where the throttle valve 5 is in contact with the stopper 5c, more specifically in a state where the displacement of the throttle valve 5 toward the closing side is limited by the stopper 5c, is fully closed. Defined as opening.

  Returning to FIG. 1, the intake pipe 11 is provided with a throttle opening sensor 9 for detecting the opening of the throttle valve 5. The throttle opening sensor 9 is constituted by a semiconductor sensor, for example. A voltage detection signal corresponding to the opening degree of the throttle valve 5 or the gear feed amount (movement amount) in the opening / closing mechanism 8 corresponding to the opening degree of the throttle valve 5 is generated and input to the ECU 6. The output voltage of the throttle opening sensor 9 increases as the throttle valve 5 opens. The ECU 6 performs A / D conversion on the detection signal of the throttle opening sensor 9 and thereby grasps the opening of the throttle valve 5.

  The ECU 6 is a microcomputer that includes an I / O interface for A / D converting sensor detection signals, a CPU for executing various arithmetic processes, and a RAM and ROM for storing various data. The ECU 6 receives detection signals from sensors such as a throttle opening sensor 9, a crank angle sensor 91, an intake pressure sensor 92, and the like. The ECU 6 executes a fuel injection control process, a rotational speed acquisition process, a load acquisition process, a target rotational speed setting process, a target opening setting process, a fully closed learning process, and a throttle opening control process, all of which will be described later.

  In the fuel injection control process, the ECU 6 controls fuel injection from the fuel injection valve 1 a of the engine 1. By this fuel injection control processing, a combustion region and a non-combustion (fuel cut etc.) region of the engine 1 shown in FIG. 4 described later are formed.

In the rotation speed acquisition process, the ECU 6 calculates and acquires the rotation speed of the engine 1 based on the crank angle detection signal of the crank angle sensor 91.
In the load acquisition process, the ECU 6 calculates and acquires the load of the engine 1 based on the intake pressure detection signal of the intake pressure sensor 92.

In the target speed setting process, the ECU 6 sets the target speed of the engine 1 based on the driving state of the vehicle (not shown). Specifically, the target rotational speed of the engine 1 is set according to the vehicle speed and the accelerator pedal operation amount.
In the target opening setting process, the ECU 6 sets the target opening of the throttle valve 5 based on the fully closed opening of the throttle valve 5 and the operating state of the engine 1 learned by a fully closed learning process described later. Specifically, the target opening degree of the throttle valve 5 is set according to the fully closed opening degree, the rotational speed of the engine 1 and the accelerator pedal operation amount.

  In the fully closed learning process, the ECU 6 drives the throttle valve 5 to the closed side immediately after the ignition (IG) is turned on and immediately after the ignition (IG) is turned off, and the displacement of the throttle valve 5 to the closed side is limited by the stopper 5c. The fully closed control for controlling the opening degree of the throttle valve 5 is executed so that the minimum opening degree is obtained. Next, the fully closed learning value is calculated using the detection signal of the throttle opening sensor 9 at this time, and the fully closed opening is updated with the calculated fully closed learning value.

  Here, as described above, the fully closed opening degree of the throttle valve is learned using the detection signal of the throttle opening degree sensor 9 when the throttle valve 5 is in contact with the stopper 5c. An error due to the distortion of the stopper 5c is included. The learning value includes a detection error caused by a temperature change of the throttle opening sensor 9 made of a semiconductor, a reading error of the CPU incorporated in the ECU 6, and a drive gear of the opening / closing mechanism 8 that opens and closes the throttle valve 5. Various learning errors such as errors caused by the error are included.

  Next, the throttle opening degree control process according to the present embodiment will be described in detail with reference to FIG. FIG. 3 is a flowchart showing a procedure of throttle opening control processing according to the present embodiment. The throttle opening control process in FIG. 3 is repeatedly executed by the ECU 6 at a predetermined cycle.

In step S1, it is determined whether or not the rotational speed of the engine 1 is a low rotational speed. Specifically, it is determined whether or not the rotation speed of the engine 1 acquired by the rotation speed acquisition process described above is equal to or less than a predetermined rotation speed set in advance.
If this determination is YES, it is determined that the engine 1 is in a low rotation state, and the process proceeds to step S2. On the other hand, if this determination is NO, it is determined that the engine 1 is not in a low rotation state, and the process proceeds to step S4.

In step S2, it is determined whether or not the load on the engine 1 is low. Specifically, it is determined whether or not the load of the engine 1 acquired by the load acquisition process is equal to or less than a predetermined load set in advance.
If this determination is YES, it is determined that the engine 1 is in a low load state, and the process proceeds to step S3. On the other hand, if this determination is NO, it is determined that the engine 1 is not in a low load state, and the routine proceeds to step S4.

  In step S3, the throttle opening is controlled so that the rotational speed of the engine 1 acquired by the above-described rotational speed acquisition process becomes the target rotational speed set by the above-described target rotational speed setting process (hereinafter, “ NE throttle opening control). Specifically, when the opening / closing mechanism 8 is driven so that the throttle opening degree according to the target rotational speed is reached, the amount of movement of the gear of the opening / closing mechanism 8 from the sensor opening value by the throttle opening degree sensor 9 (feed) The duty ratio of the drive current of the motor 7 is determined using the amount, and the motor 7 is driven under the determined duty ratio, so that the opening degree of the throttle valve 5 is feedback-controlled toward the target rotational speed. Thereafter, this process is terminated.

  In step S4, the throttle opening is controlled so that the sensor opening value of the throttle opening sensor 9 becomes the target opening set by the above-described target opening setting process (hereinafter referred to as “THA throttle opening control”). Called). Specifically, based on the set target opening and the fully closed opening of the throttle valve 5 learned by the above-described fully closed learning process, the opening / closing mechanism 8 of the opening / closing mechanism 8 from the sensor opening value by the throttle opening sensor 9 is determined. The duty ratio of the drive current of the motor 7 is determined using the amount of movement (feed amount) of the gear, and the motor 7 is driven under the determined duty ratio, so that the opening degree of the throttle valve 5 is directed to the target opening degree. Feedback control. Thereafter, this process is terminated.

  Here, FIG. 4 is a diagram for explaining the throttle opening degree control processing according to the present embodiment. In FIG. 4, the horizontal axis represents the rotation speed of the engine 1, and the vertical axis represents the load of the engine 1. That is, in FIG. 4, the lower left shows an operation region with a low rotation and low load, and the upper right shows an operation region with a high rotation and high load. Moreover, the straight line in FIG. 4 has shown the boundary of a combustion area | region and a non-combustion (fuel cut etc.) area | region.

As shown in FIG. 4, the NE throttle opening control in step S3 described above is executed in the low rotation and low load region in the combustion region. This is because in the non-combustion region, the rotational drive of the engine 1 is stopped, so that the NE throttle opening degree control cannot be executed.
Further, the THA throttle opening control in step S4 described above is executed in a region other than the non-combustion region and the low rotation / low load region in the combustion region.
As described above, the throttle opening degree control process of this embodiment has a great feature in that it switches between the NE throttle opening degree control and the THA throttle opening degree control.

According to the throttle opening control process according to the present embodiment, the following effects are produced.
In the present embodiment, when the engine 1 in the combustion state during fuel supply satisfies both the requirements of the low rotation state and the low load state, the rotation speed acquired by the rotation speed acquisition process is the target. The opening / closing mechanism 8 was controlled to control the opening degree of the throttle valve 5 so that the target rotation speed set by the rotation speed setting process was reached. That is, in a low rotation and low load state such as during idling, the engine 1 speed is equal to the target speed without using feedback control according to the opening detected by the throttle opening sensor 9 and the target opening. Thus, the opening degree of the throttle valve 5 was controlled.
Therefore, according to the present embodiment, the rotational speed of the engine 1 that can be acquired with high accuracy is used without using the target opening set based on the fully closed opening learned with a learning error as in the prior art. Therefore, since the opening degree of the throttle valve 5 is controlled, it can be controlled with high accuracy and controllability is improved. Further, since the opening degree of the throttle valve 5 is controlled so that the rotational speed of the engine 1 becomes the target rotational speed, an idling state can be sufficiently secured during idling operation, and the engine 1 can be used in a low-rotation and low-load state such as idling operation. The minimum number of revolutions can be reliably ensured, and the occurrence of engine stall can be reliably avoided.

Further, in this embodiment, when the fuel is not supplied at the time of fuel cut or the like, or when the engine 1 in the combustion state during the fuel supply is not in the low rotation and low load state, it is detected by the throttle opening sensor 9. The opening / closing mechanism 8 was controlled to control the opening of the throttle valve 5 so that the sensor opening became the target opening set by the target opening setting process. That is, in this case, the opening degree of the throttle valve 5 is controlled to be the target opening degree by using the sensor opening degree by the throttle opening degree sensor 9 as in the conventional case.
Therefore, according to the present embodiment, when there is no possibility of engine stall as compared with a low rotation and low load state such as during idling, the throttle opening is controlled by switching to the throttle opening control using the sensor opening. Priority can be given to quick response to operations. This is because a quick response to the throttle operation is not required in the low rotation / low load region, whereas a quick response to the throttle operation is required in a region other than the low rotation / low load region.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

1. Engine (internal combustion engine)
2 ... Control device 5 ... Throttle valve 6 ... ECU (opening / closing means, rotation speed acquisition means, load acquisition means, target rotation speed setting means, throttle opening control means, target opening setting means)
7. Motor (actuator)
8. Opening / closing mechanism (opening / closing means)
9 ... Throttle opening sensor 11 ... Intake pipe (intake passage)
91 ... Crank angle sensor (rotational speed acquisition means)
92 ... Intake pressure sensor (load acquisition means)

Claims (2)

A control device for a throttle valve for controlling an opening degree of a throttle valve provided in an intake passage of an internal combustion engine,
Opening and closing means for opening and closing the throttle valve by an actuator;
A throttle opening sensor for detecting the opening of the throttle valve;
Fuel supply control means for controlling fuel supply to the engine;
A rotational speed acquisition means for acquiring the rotational speed of the engine;
Load acquisition means for acquiring the load of the engine;
Target speed setting means for setting the target speed of the engine;
When the fuel is supplied to the engine by the fuel supply control means, the rotational speed acquired by the rotational speed acquisition means is not more than a predetermined rotational speed and the engine is in a low rotational state, and the load acquisition When the load acquired by the means satisfies a requirement that the load is equal to or less than a predetermined load and the engine is in a low load state, the rotational speed acquired by the rotational speed acquisition means is set by the target rotational speed setting means And a throttle opening control means for controlling the opening and closing means to control the opening degree of the throttle valve so as to achieve a target rotational speed. Further comprising target opening setting means for setting a target opening of the throttle valve;
The throttle opening control means satisfies any of the above requirements when fuel is not supplied to the engine by the fuel supply control means and when fuel is supplied to the engine by the fuel supply control means. If not, the opening / closing means is controlled to control the opening of the throttle valve so that the opening detected by the throttle opening sensor becomes the target opening set by the target opening setting means. The throttle valve control device according to claim 1, wherein the throttle valve is controlled.

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