JP5160382B2 - Electronic throttle valve control device - Google Patents

Description

  The present invention relates to a throttle valve control device for an internal combustion engine, and more particularly to a throttle valve control device for an internal combustion engine that performs various controls based on a fully closed reference position of the throttle valve.

2. Description of the Related Art Conventionally, idle speed control (ISC) is known that controls a throttle valve so that an actual engine speed during idling of an internal combustion engine becomes a predetermined target speed.
According to Japanese Patent Application Laid-Open No. 11-13514, after the ignition switch (IG-SW) is turned on, the throttle relay is turned off for a predetermined time to keep the clutch 12 in a non-coupled state. When the clutch 12 is in the non-coupled state, the throttle valve 10 is stopped at the opener position 14, and the throttle sensor output value at this time is learned as the opener position learning value OMGAG. When the throttle fully closed position learning value OTP is obtained based on the opener position learning value OMGAG, OTP = OMGAG-B (V).
Here, B (V) is a voltage difference (design value) between the open position of the throttle body (corresponding to the opener 14 in FIG. 1) and the throttle fully closed position (corresponding to the throttle fully closed stopper 16 in FIG. 1). is there.

The throttle fully closed position D when the throttle valve is controlled to the closed side is defined by the throttle fully closed stopper 16, and the throttle fully closed position D is obtained by the throttle sensor at this time.
The obtained throttle fully closed position D is changed as the throttle fully closed position learning value OTP, and the ISC required opening degree TAISC obtained by adding the ISC learned value DG to the throttle fully closed position learned value OTP is used as a reference. As a target value, idle speed control (ISC) is performed.
Japanese Patent Laid-Open No. 11-13514

However, since the fully closed position learned value OTP may fluctuate due to the influence of the engine temperature at the time of learning, the fully closed position learned value OTP and the ISC learned value DG calculated when the internal combustion engine is restarted are used. There may be a difference between the fully closed position learning value OTP when the added ISC required opening degree TAISC is updated.
For example, as shown in FIG. 5, the throttle fully closed position by the throttle sensor at the time of this restart is compared with the fully closed position learned value OTP (A) when the ISC learned value DG is updated after the previous complete warm-up. When the value is changed to the new fully closed position learning value OTP (B), when this value is shifted to the opening side, the ISC required opening degree TAISC = new fully closed position learned value OTP (B) + ISC learned value DG, which is truly required. There has been a problem that the rotational speed of the internal combustion engine does not decrease to a predetermined rotational speed at startup or idling.

Further, the throttle valve 10 stops at the opener position 14, and the throttle sensor output value at this time is learned as the opener position learning value OMGAG. Based on the opener position learning value OMGAG, the throttle fully closed position learning value OTP (A) is , OTP = OMGAG-B (V).
However, the opener position learning value OMGAG varies due to mechanical hysteresis, temperature characteristics, etc. As shown in FIG. 4, when the opener position learning value OMGAG (B) varies, for example, to the open side, the throttle fully closed The position learning value OTP becomes larger than the actual throttle fully closed position, and a phenomenon occurs in which the engine speed does not decrease to the idling engine speed.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electronic throttle valve control device that solves the above-described problems caused by variations in the fully closed position learned value and the opener position learned value.

A throttle valve control device for an internal combustion engine according to a first aspect of the invention learns a fully closed reference position OTP of the throttle valve when the internal combustion engine is started, and the target engine speed at which the actual engine speed is predetermined when the internal combustion engine is idle. The throttle valve is controlled so that the throttle opening is obtained by adding the fully closed reference position OTP to the ISC learning value DG of the throttle opening so as to be a number. Therefore, the throttle valve control device of the internal combustion engine changes the throttle fully closed position learning value OTP in a plurality of stages when changing to the throttle fully closed position D.

The throttle valve control apparatus for an internal combustion engine according to the second aspect of the invention changes the ISC learning value DG to the throttle fully closed position D in the first aspect of the invention .
The throttle valve control device for an internal combustion engine according to the third aspect of the invention is changed in a plurality of steps when the ISC learning value DG is changed to the throttle fully closed position D in the second aspect of the invention .
The throttle valve control device for an internal combustion engine according to a fourth aspect of the present invention is the second or third aspect, wherein the change amount and the ISC learning value DG at each stage of changing the throttle fully closed position learned value OTP to the throttle fully closed position D are obtained. The amount of change at each stage of changing to the throttle fully closed position D is the same.

Since the throttle valve control device for an internal combustion engine according to the first aspect of the invention does not suddenly change to the throttle fully closed position D but changes in a plurality of stages, the throttle valve can be controlled smoothly.
Further, the throttle valve control device for an internal combustion engine according to the second aspect of the invention changes the ISC learning value DG to the throttle fully closed position D, so that the throttle valve opening is reduced and the idling speed of the engine can be prevented from increasing. .
Further, in the throttle valve control device for an internal combustion engine according to the third aspect of the present invention , the throttle valve does not suddenly hit the throttle fully closed stopper 16 by being reduced in a plurality of stages, and the throttle fully closed stopper 16 is deformed and worn. It becomes prevention.
In the throttle valve control apparatus for an internal combustion engine according to the fourth aspect of the present invention , the throttle fully closed position learning value OTP and the ISC learning value DG that are changed in stages are the same, so that the throttle valve opening fluctuation does not occur and idle rotation occurs. The number fluctuation can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows the configuration of a throttle valve control device 100 for an internal combustion engine according to the present invention. As shown in FIG. 1, in the throttle valve control device 100, the throttle valve 10 is driven by a computer (ECU) 17 by controlling a motor 11 and a clutch 12 that transmits the driving force of the motor 11 to the throttle valve 10. .

The ECU 17 calculates the output values from various sensors such as an accelerator opening sensor (such as the rotation speed sensor Ne, the water temperature sensor THw, and the air amount sensor), and calculates the optimum throttle valve opening (target throttle opening) from the calculation results. Degree).
The opening / closing of the throttle valve 10 is adjusted by the ECU 17 controlling actuators such as the motor 11 and the clutch 12 based on the target throttle opening. Resin parts are used for this actuator.

The actual throttle opening (actual throttle opening) is detected by the throttle opening sensor 13 and fed back to the ECU 17 as a throttle opening sensor signal. The ECU 17 feedback-controls the actuator so that the actual throttle opening becomes the target throttle opening.
When the clutch is in a non-coupled state (OFF state), the throttle valve is urged by the spring 15 so as to contact the opener 14 (opener position).
Further, the throttle fully closed position when the throttle valve is controlled to the closed side is defined by the throttle fully closed stopper 16 (throttle fully closed position).

  The throttle valve control device according to the present embodiment is a means for learning a throttle fully closed position learning value (fully closed reference position) OTP when the internal combustion engine is started, and a target in which the actual engine speed of the internal combustion engine is set in advance during idling. The throttle opening is learned so as to be the rotational speed, and a means for calculating the ISC required opening TAISC by adding the throttle fully closed position learning value OTP to the ISC learning value DG is provided, and the throttle opening of the ISC required opening TAISC is calculated. And a means for controlling the throttle valve so as to obtain a degree.

Further, the throttle valve control device according to the present embodiment further includes changing means (detailed later) for changing this value to a throttle fully closed position learning value when a new throttle fully closed position is obtained. . These means are realized by the computer (ECU) described above.
The throttle fully closed position, the throttle fully closed position learning value, the ISC required opening degree TAISC, and the like are angles or values corresponding to the angles.

(1) Throttle fully closed position learning value OTP
The throttle fully closed position learning value OTP will be described. After the ignition switch (IG-SW) is turned on, the throttle relay is turned off and the clutch 12 is kept in the non-coupled state. When the clutch 12 is in the non-engaged state, the throttle valve 10 remains at the opener position 14 as described above. The throttle sensor output value 13 at this time is learned as an opener position learning value OMGAG.
Based on the opener position learning value OMGAG, the throttle fully closed position learning value OTP is calculated as OTP = OMGAG-B (V).
This B (V) is a voltage difference (design value) between the throttle body opener position (corresponding to the opener 14 in FIG. 1) and the throttle fully closed position (corresponding to the throttle fully closed stopper 16 in FIG. 1). is there.

(2) Throttle fully closed position D
The actual throttle opening (actual throttle opening) Va is detected by the throttle opening sensor 13 and fed back to the ECU 17 as a throttle opening sensor signal.
Further, the throttle fully closed position D when the throttle valve is controlled to the closed side is regulated by the throttle fully closed stopper 16 and is measured at the actual throttle opening degree Va (a state where the throttle is in contact).

Next, as shown in FIG. 4, when the “open throttle position learning value OTP” is larger than the full throttle position D due to variations in the position of the opener position 14 due to mechanical hysteresis, temperature characteristics, etc., the engine speed during idling I will explain the problem of not going down.
As a method for solving this problem, as shown in FIG. 2, the throttle fully closed position learning value OTP is changed to the throttle fully closed position D, and the throttle opening is “ISC required opening TAISC = throttle fully closed position D + ISC learned value. The throttle valve is controlled so as to be “DG”.

As a control system for changing the throttle fully closed position learning value OTP to the throttle fully closed position D, for example, there is a feedback PID control system, and, in addition, as shown in FIG. There is also a way to do it.
Therefore, a method for switching in a plurality of stages will be described.

(Scheme 1) Assume that the time required for the change is T, and that the time is N times. Further, “throttle fully closed position learning value OTP” − “throttle fully closed position D” = ΔD.
Then, in order to bring the throttle fully closed position learning value OTP close to the throttle fully closed position D, it is decreased by (ΔD / N) every T / N time. In this method, the same value is decreased step by step every T / N time.
That is, ISC required opening TAISC = ISC required opening TAISC− (ΔD / N) i (i = 1 to N), and throttle valve opening is “ISC required opening TAISC = throttle fully closed position learning value OTP + ISC Learning value DG "and finally" ISC required opening degree TAISC = throttle fully closed position D + ISC learning value DG ".

(Draft 2)
This plan 2 differs from plan 1 in that it does not adopt the same value in each stage, but reduces the first half greatly and the second half smaller so that it can be changed stably. is there.
It is assumed that the time required for the change is T, which is N times, and “throttle fully closed position learning value OTP” − “throttle fully closed position D” = ΔD.
Therefore, for example, among N times, the amount of change is changed between 0.8N in the first half and 0.2N in the second half, and the amount of change in each stage of 0.8N times in the first half is F1 × ΔD / N, 0 in the second half. The change amount for each stage of 2N times is F2 × ΔD / N.

That is, ISC required opening degree TAISC = ISC required opening degree TAISC−F * (ΔD / N) i (i = 1 to N). Note that F is a factor, and in the above example, F1 = 1.1 for the first 0.8N times and F2 = 0.6 for the second 0.2N times.
The throttle valve opening finally becomes “ISC required opening TAISC = throttle fully closed position D + ISC learning value DG”.

In this way, the target value can be changed in a stable state by decreasing the change amount as the target value is approached.
As described above, various methods can be used for the number of changes, the amount of change corresponding to the number of changes, etc., and the number of times is selected so that the target value can be obtained quickly and stably without causing damping. To do.

Next, as shown in FIG. 5, when the current fully closed position learned value OTP (B) is changed to the previous fully closed position learned value OTP (A), this value is shifted to the opening side. In some cases, the throttle opening becomes excessive with respect to the truly required throttle opening, causing a problem that the rotational speed of the internal combustion engine at the time of starting or idling does not decrease to a predetermined rotational speed.
In view of this problem, the throttle fully closed position learning value OTP is changed to the throttle fully closed position D and the ISC learned value DG is also decreased to the throttle fully closed position D as shown in FIG.
In implementing such a change, it can be implemented by adopting a PID control method, but here, change control in a plurality of stages will be described.

(Scheme 1) Assume that the time required for the change is T, and that the time is N times. Further, “throttle fully closed position learning value OTP” − “throttle fully closed position D” = ΔD.
Then, in order to change the throttle fully closed position learned value OTP to the throttle fully closed position D, the throttle fully closed position learned value OTP is decreased (ΔD / N) every T / N time, and the ISC learned value DG is also reduced every T / N time (ISC Learning value DG / N) is decreased.
That is, throttle fully closed position learned value OTP = throttle fully closed position learned value OTP− (ΔD / N) i, ISC learned value DG = ISC learned value DG− (ISC learned value DG) / Ni (i = 1 to N) It becomes.
In this method, the same value is decreased every T / N time, and the throttle valve opening degree control is ISC required opening degree TAISC = throttle fully closed position learning value OTP + ISC learning value DG ”.
Finally, the throttle fully closed position learned value OTP becomes the throttle fully closed position D, and the ISC learned value DG becomes “0”.

(Scheme 2) Assume that the time required for the change is T, and that the time is N times. Further, “throttle fully closed position learning value OTP” − “throttle fully closed position D” = ΔD1.
Therefore, for example, among N times, the change amount is changed between 0.8N times in the first half and 0.2N times in the second half. The first half 0.8N times is F1 × ΔD / N, and the second half 0.2N times is F2 × ΔD / N. As for the decrease amount of the ISC learning value DG, the first half of 0.8N is changed by F3 × (ISC learning value DG) / N, and the latter half of 0.2N is changed by F4 × (ISC learning value DG) / N. Amount.

That is, throttle fully closed position learned value OTP = throttle fully closed position learned value OTP−F1 × ΔD / N, ISC learned value DG = ISC learned value DG− (ISC learned value DG) / Ni (i = 1 to N), The first half F1 = 0.8, F3 = 0.8, the second half F2 = 0.2, and F4 = 0.2.
Then, the throttle valve opening control is ISC required opening TAISC = throttle fully closed position learned value OTP + ISC learned value DG. Finally, the throttle fully closed position learned value OTP is set to the throttle fully closed position D and ISC learned. The value DG is “0”.

(Scheme 3) This plan is to change the throttle fully closed position learned value OTP and the ISC learned value DG by the same amount, and to prevent fluctuations in the idling engine speed because the throttle valve opening fluctuation does not occur.
Therefore, it is assumed that the time required for the change is T, and that the change is performed N times. Further, “throttle fully closed position learning value OTP” − “throttle fully closed position D” = ΔD.
Throttle fully closed position learned value OTP = Throttle fully closed position learned value OTP− (ΔD / N) i, ISC learned value DG = ISC learned value DG− (ISC learned value DG) / Ni (i = 1 to N) The throttle valve opening control is “ISC required opening TAISC = throttle fully closed position learning value OTP + ISC learning value DG”.
Finally, the throttle fully closed position learned value OTP becomes the throttle fully closed position D, and the ISC learned value DG becomes “0”.
Note that ΔD may be obtained from the ISC learning value DG.

As described above, by changing the throttle fully closed position learned value OTP to the throttle fully closed position D and also reducing the ISC learned value DG, the opening of the throttle valve is reduced, and the engine idle speed does not decrease. Can be prevented.
Further, by reducing the ISC learning value DG in a plurality of stages, the throttle valve does not suddenly hit the throttle fully closed stopper 16, and the throttle fully closed stopper 16 is prevented from being deformed and worn.
Further, by changing the throttle fully closed position learned value OTP to the throttle fully closed position D, the ISC learned value DG will not be suddenly changed to the open side, and the throttle valve will not be suddenly opened. Pleasure can be prevented.

  Note that changing the throttle fully closed position learned value OTP and the ISC learned value DG is not limited to the above example, and may be a control method that is selected and changed as necessary. Moreover, although the example of the change of the discrete value which changes in a step shape is given for the control in the plurality of steps, it may be a continuous change amount control like a broken line.

It is a figure which shows typically the structure of the throttle valve control apparatus of the internal combustion engine by this invention. It is a figure which shows the concept of the control with respect to the fluctuation | variation of an opener learning value. It is a figure which shows the concept of the control with respect to the change of throttle fully closed position learning value. It is a figure which shows the concept of the control with respect to the fluctuation | variation of the conventional opener learning value. It is a figure which shows the concept of the control with respect to the change of the conventional throttle fully closed position learning value.

Explanation of symbols

10 Throttle valve 11 Motor 12 Clutch 13 Throttle opening sensor 14 Opener 15 Spring 16 Throttle fully closed stopper 17 ECU
100 Throttle valve control device

Claims (3)

The throttle valve fully closed reference position OTP is learned when the internal combustion engine is started, and the throttle opening ISC learning value DG is set so that the actual engine speed becomes a predetermined target speed when the internal combustion engine is idle. A throttle valve control device for an internal combustion engine that controls a throttle valve so as to obtain a throttle opening obtained by adding a fully closed reference position OTP,
When the throttle fully closed position learning value OTP is changed to the throttle fully closed position D, it is changed in a plurality of stages .
A throttle valve control device for an internal combustion engine that changes the ISC learning value DG to a throttle fully closed position D. In changing ISC learned value DG in the throttle fully closed position D, the throttle valve control apparatus for an internal combustion engine according to claim 1, modified in a plurality of stages. Claim 1 or claim change amount in each stage is the same for changing the change amount and ISC learned value DG at each stage to change the throttle full-closed position learning value OTP to the throttle fully closed position D in the throttle fully closed position D 2. A throttle valve control device for an internal combustion engine according to 2 .

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