JP2001234758A - Throttle valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle valve control device capable of effectively suppressing or reducing generation of abnormal sound at the intake. SOLUTION: This throttle valve control device controls a throttle valve 8 for regulating the intake air quantity of an internal combustion engine 1 disposed in an intake passage 4 of the internal combustion engine 1 and is provided with valve opening speed detection means 9, 11 for detecting the opening speed of the throttle valve 8 and valve opening speed control means 10, 11 for controlling opening speed of throttle valve 8. The valve opening speed control means 10, 11 are characterized by being constituted so as to suppress a rise in opening speed of the throttle valve 8 based on opening speed of the throttle valve 8 detected by the valve opening speed detection means 9, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control device for controlling a throttle valve for adjusting an intake air amount of an internal combustion engine.

[0002]

2. Description of the Related Art An internal combustion engine generates power by burning a mixture of intake air and injected fuel. The power output by the internal combustion engine can be controlled by adjusting the amount of intake air (intake air amount) and the amount of fuel to be injected (fuel injection amount). Here, the intake air amount is adjusted by a throttle valve provided on an intake passage of the internal combustion engine. In the case of a vehicle or the like, the opening of the throttle valve is adjusted according to the amount of depression of the accelerator pedal (pedal stroke amount) by the driver.

Conventionally, a throttle valve and an accelerator pedal are directly connected by a wire or the like, and the throttle valve is opened when the accelerator pedal is depressed. However, in recent years, instead of opening and closing the throttle valve by mechanical coupling between them, the pedal stroke of the accelerator pedal is electrically detected, and the throttle valve is opened and closed by a motor or the like based on the detection result. Electronically controlled throttle valves are also in practical use.

[0004]

When the throttle valve is opened abruptly, a vortex is generated in the intake passage due to turbulence in the air flow, and an abnormal noise (air flow noise) is generated. The generated vortex may generate a new vortex in the intake manifold or the surge tank, which may promote the generation of abnormal noise. It has been attempted to dispose these nets and fins on the intake passage to eliminate these vortices. However, when the intake manifold is made of resin in recent years, the propagation and radiation of such abnormal noise become more remarkable, and there is a possibility that these measures alone cannot cope with the problem.

[0005] Such abnormal noise is particularly remarkable when the vehicle is stopped where no road noise or the like is generated, and causes a driver to feel discomfort when the accelerator pedal is operated when the vehicle is stopped. Therefore, it is desired to reduce the occurrence of such abnormal noise during intake. Accordingly, it is an object of the present invention to provide a throttle valve control device capable of effectively suppressing or reducing generation of abnormal noise during intake.

[0006]

SUMMARY OF THE INVENTION The present invention controls a throttle valve, which is provided in an intake passage of an internal combustion engine and controls the amount of intake air of the internal combustion engine, and detects the opening speed of the throttle valve. Speed detection means, and valve opening speed control means for controlling the opening speed of the throttle valve, wherein the valve opening speed control means detects a throttle valve based on the opening speed of the throttle valve detected by the valve opening speed detection means. It is characterized in that it is configured to suppress an increase in the opening speed of the valve.

According to the present invention, when the opening speed of the throttle valve is detected by the valve opening speed detecting means, and the detected opening speed of the throttle valve becomes an opening speed that generates abnormal noise, An increase in the opening speed of the throttle valve is suppressed by the valve opening speed control means. As a result, rapid turbulence of the airflow in the intake passage is reduced, and generation of abnormal noise is suppressed or reduced.

Here, the vehicle further comprises gear position detecting means for detecting a gear position of the transmission mechanism for shifting the output of the internal combustion engine, wherein the gear position of the transmission mechanism detected by the gear position detecting means is a neutral position or a parking position. Only in the case of (1), it is preferable to suppress the increase in the opening speed of the throttle valve.

With this configuration, the control of the opening speed of the throttle valve by the valve opening speed control means can be limited to when the gear position of the transmission mechanism is in the neutral position or the parking position. When the gear position is in the neutral position or the parking position, the vehicle is mostly in a stopped state. In such a case, the abnormal noise due to the rapid opening of the throttle valve is easily heard, so that the generation of the abnormal noise is suppressed or reduced.

On the other hand, when the gear position is not in the neutral position or the parking position,
In most cases, the vehicle is running. In such a case, the noise caused by the sudden opening of the throttle valve cannot be heard due to road noise, wind noise, operation noise of the internal combustion engine, etc.
Alternatively, since the sound is hard to hear, the throttle valve opening speed control is not performed, and the throttle valve is opened and closed with emphasis on high responsiveness.

That is, in a state where high responsiveness is not required and abnormal noise is easily heard, opening speed control of a throttle valve is performed to suppress or reduce the generation of abnormal noise, and high responsiveness is required. When the noise is hard to hear, the opening speed control of the throttle valve is not performed. The neutral position and parking position here are:
The neutral position or parking position in an automatic transmission or the neutral position in a manual transmission.

In this case, the apparatus further comprises valve opening detecting means for detecting the opening of the throttle valve, wherein the valve opening speed controlling means determines whether the opening of the throttle valve detected by the valve opening detecting means is a predetermined value. It is preferable that the throttle valve is configured to suppress an increase in the opening speed of the throttle valve only when the opening degree is equal to or less than the opening degree.

The abnormal noise caused by the rapid opening of the throttle valve is caused by the turbulence of the air flow in the intake passage caused by the opening of the throttle valve. That is, after the throttle valve is opened to some extent, the above-mentioned abnormal noise does not occur (or is not at a problematic level). Therefore, when the opening of the throttle valve exceeds a predetermined opening, the throttle valve is opened. Yes, it is necessary to suppress the opening speed.

Therefore, only when the opening of the throttle valve detected by the valve opening detecting means is equal to or less than the predetermined opening, the valve opening speed control means suppresses an increase in the opening speed of the throttle valve. As a result, when the opening of the throttle valve exceeds a predetermined opening, the internal combustion engine is operated while maintaining high responsiveness by normal control, thereby generating abnormal noise without giving the driver an uncomfortable feeling. Can be suppressed or reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a throttle valve control device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration diagram of an internal combustion engine having the control device of the present embodiment. The engine (internal combustion engine) 1 shown in FIG. 1 is an in-cylinder injection type engine that directly injects fuel into a cylinder 2, but the present invention is also applicable to an engine that injects fuel into an intake port. Is applicable.

The control device according to the present embodiment is a device attached to the engine 1 mounted on a vehicle. As shown in FIG. 1, the engine 1 generates a driving force by igniting an air-fuel mixture in each cylinder 2 with a spark plug 3. During combustion of the engine 1, air taken in from the outside passes through the intake passage 4 and is mixed with fuel injected from the injector 5 in the cylinder 2. The interior of the cylinder 2 and the intake passage 4 are opened and closed by an intake valve. The air-fuel mixture burned inside the cylinder 2 is exhausted to the exhaust passage 6 as exhaust gas. The interior of the cylinder 2 and the exhaust passage 6 are opened and closed by an exhaust valve.

The intake passage 4 of this embodiment is formed from the intake manifold 7 made of resin to the inside of the engine block. The cylinder 2 is located on the intake passage 4.
A throttle valve 8 for adjusting the amount of intake air drawn into the inside is provided. The throttle valve 8 is connected to a throttle position sensor 9 for detecting the throttle valve opening β. The throttle valve 8 is opened by a throttle motor 10. Further, a return spring (not shown) is attached to the throttle valve 8, and when the driving force of the throttle motor 10 is reduced to zero, the throttle valve 8 is returned to the closed state by the return spring.

The throttle position sensor 9 and the throttle motor 10 are connected to an ECU 11 that comprehensively controls the operation of the engine 1. An accelerator position sensor 12 is also connected to the ECU 11. The accelerator position sensor 12 detects the pedal stroke of the accelerator pedal 13 and sends the detection result to the ECU 11. The ECU 11 determines the throttle valve 8 based on the detection result of the accelerator position sensor 12 and other information.
Is determined, and the throttle motor 10 is driven such that the throttle valve opening β becomes the target valve opening β0.

In the present embodiment, the ECU 11 determines the target valve opening of the throttle valve 8 based on the pedal stroke of the accelerator pedal 13 detected by the accelerator position sensor 12 and the engine speed detected by the crank position sensor 14. β0 has been determined. The target valve opening β0 is determined by the RO inside the ECU 11.
M is stored as a map based on the pedal stroke amount and the engine speed.

The throttle position sensor 9 is
It functions as valve opening detecting means for detecting the throttle valve opening β. Also, the throttle position sensor 9
Detects the throttle valve opening β, but if the ECU 11 calculates the time derivative of the detected throttle valve opening β, the throttle valve opening speed α can be obtained (the closing speed can also be calculated). That is, the throttle position sensor 9 and the ECU 11 function as valve opening speed detecting means for detecting the throttle valve opening speed α.

Further, the throttle motor 10 includes an ECU
Since the throttle valve 10 is driven based on the command from the controller 11, the throttle valve opening speed α can be controlled by controlling the driving of the throttle motor 10. That is, the throttle motor 10 and the ECU 11 function as valve opening speed control means for controlling the throttle valve opening speed α.

Further, the ECU 11 is also connected to a transmission ECU 16 for comprehensively controlling a transmission (transmission mechanism) 15. The transmission 15 of the present embodiment is an automatic transmission, and the gear position is changed by the selector lever 17. The gear position is detected by a gear position sensor 18. Transmission EC
U16 drives the control valve 19 to shift the transmission 15. That is, the gear position sensor 18 and the transmission ECU 16 function as gear position detecting means for detecting the gear position of the transmission 15.

Next, control of the throttle valve 8 using the above-described control device will be described with reference to the flowchart shown in FIG.

First, the engine speed is detected from the output of the crank position sensor 14, and the pedal stroke of the accelerator pedal 13 is detected from the output of the accelerator position sensor 12. Then, based on the detected engine speed and pedal stroke, the target valve opening degree β0 of the throttle valve 8 is determined by a map stored in a ROM in the ECU 11 (step 100). Next, the ECU 11 controls the throttle motor 1 so that the throttle valve opening β becomes the determined target valve opening β0.
0 to open the throttle valve 8 (step 11).
0).

Next, the ECU 11 determines from the output of the gear position sensor 18 whether the gear position is the neutral position or the parking position (step 120). In step 120, if the gear position is not in the neutral position or the parking position and is in another gear position such as the drive position or the reverse position, the process proceeds to step 170 described later without controlling the opening speed of the throttle valve 8. .

On the other hand, if the gear position is the neutral position or the parking position in step 120, the next step is performed to control the throttle valve opening speed α in a situation where abnormal noise due to intake may occur. Proceed to. In the next step, the ECU 11 calculates the output of the throttle position sensor 9 in the ECU 11 to calculate the throttle valve opening speed α of the throttle valve 8 (step 130). Then, the calculated throttle valve opening speed α is equal to the predetermined valve opening speed α.
It is determined whether it is greater than 1 (step 140).

The predetermined valve opening speed α1 is an opening speed at which, when the throttle valve 8 is opened at a speed higher than that, a vortex is generated in the intake passage 4 due to turbulence of the air flow, thereby generating abnormal noise. If the throttle valve opening speed α is equal to or less than the predetermined valve opening speed α1,
Is negative, it can be determined that no abnormal noise occurs because the throttle valve opening speed α is low. In this case, the process proceeds to step 170 described later without controlling the throttle valve opening speed α.

On the other hand, if the throttle valve opening speed α is larger than the predetermined valve opening speed α1, ie,
If the result in Step 40 is affirmative, it can be determined that the throttle valve opening speed α is large and that there is a possibility that abnormal noise may occur. In this case, the process proceeds to the next step, and it is determined whether or not the throttle valve opening β detected by the throttle position sensor 9 is larger than a predetermined valve opening β1 (step 150).

As described above, if the throttle valve 8 is already fully opened, no vortex that generates abnormal noise is formed on the intake passage 4. The predetermined valve opening β1 is a valve opening at which no abnormal noise is generated even if the throttle valve 8 is rapidly opened from the opening. Therefore, if the throttle valve opening β is larger than the predetermined valve opening β1,
If the result in 50 is negative, it is determined that control of the throttle valve opening speed α is not necessary, and the routine proceeds to step 170 described later.

On the other hand, if the throttle valve opening β is equal to or smaller than the predetermined valve opening β1, that is, if the result in step 150 is affirmative, it is determined that the throttle valve opening β is small, and there is a possibility that abnormal noise may occur. it can. in this case,
The process proceeds to the next step to control the throttle valve opening speed α. In the next step, the throttle valve opening speed α
First, a target valve opening speed α0, which is a target, is set in order to prevent the pressure from rising further than the predetermined valve opening speed α1. The target valve opening speed α0 is set to at least the predetermined valve opening speed α1 described above.

In the present embodiment, the target valve opening speed α0 is fixedly set to about half the predetermined valve opening speed α1. Here, the ECU 11 controls the deceleration so that the throttle valve opening speed α becomes the target valve opening speed α0 by suppressing the drive output of the throttle motor 10 (step 160). Next, the throttle valve opening β is set to the target valve opening β0 set in step 100.
Is determined (step 170).

In step 170, if the throttle valve opening β is equal to the target valve opening β0, there is no need to open the throttle valve 8 any more, and the routine exits. On the other hand, if the throttle valve opening β is not the target valve opening β0, the process returns to step 110,
The processing of steps 110 to 160 is repeated again, and this routine ends when step 170 is affirmed. While the processing of steps 110 to 160 is repeatedly performed, steps 120, 140,
If the condition of 150 is denied, the deceleration control of the throttle valve opening speed α is not performed at that time.

Some examples of the relationship between the throttle valve opening β and the throttle valve opening speed α in the above-described control are shown in the graph of FIG.

First, an example shown by a curve in FIG. 3 will be described. In this curve, since the throttle valve opening speed α has reached the predetermined valve opening speed α1, the rise of the throttle valve opening speed α is suppressed (in this case, the throttle valve is particularly decelerated). The throttle valve opening speed α is reduced to the target valve opening speed α0 (some overshoot occurs from the target valve opening speed α0). In this example, the throttle valve opening speed α is set to the target valve opening speed α0, and almost simultaneously with the throttle valve opening β reaching the predetermined valve opening β1, the control of the throttle valve opening speed α is released. Thereafter, the throttle valve opening speed α is increased to open the throttle valve 8 to the target valve opening β0.

Next, an example shown by a curve in FIG. 3 will be described. In this curve, since the throttle valve opening speed α has reached the predetermined valve opening speed α1, the increase in the throttle valve opening speed α is suppressed, and the throttle valve opening speed α is reduced with the target valve opening speed α0 as the target. However, before the throttle valve opening speed α reaches the target valve opening speed α0, the throttle valve opening β
Has reached the predetermined valve opening degree β1, the control of the throttle valve opening speed α has been released. After the control of the throttle valve opening speed α is released, the throttle valve opening speed α is increased to open the throttle valve 8 to the target valve opening β0.

Next, an example shown by a curve in FIG. 3 will be described. In this curve, since the throttle valve opening speed α has reached the predetermined valve opening speed α1, the increase in the throttle valve opening speed α is suppressed, and the throttle valve opening speed α is reduced to the target valve opening speed α0.
After the throttle valve opening speed α is maintained at the target valve opening speed α0 for a while, the throttle valve opening β
Has reached the predetermined valve opening degree β1, the control of the throttle valve opening speed α is released. After the control of the throttle valve opening speed α is released, the throttle valve opening speed α is increased to open the throttle valve 8 to the target valve opening β0.

Next, an example shown by a curve in FIG. 3 will be described. In this curve, since the throttle valve opening speed α has reached the predetermined valve opening speed α1, the rise of the throttle valve opening speed α is suppressed. However, the accelerator pedal 13 is held in a state in which the accelerator pedal 13 has been stroked to some extent, and it is not necessary to further open the throttle valve opening β, and the throttle valve opening speed α is zero. In addition to the above-described example, since the throttle valve opening speed α has reached the predetermined valve opening speed α1, the increase in the throttle valve opening speed α is suppressed.
May be stopped and the throttle valve opening β is returned to zero.

The throttle valve control device according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, when the throttle valve opening speed α reaches the predetermined valve opening speed α1, the target valve opening speed α0 lower than the predetermined valve opening speed α1 is set, but the throttle valve opening speed α is Predetermined valve opening speed α
When it has reached 1, the increase in the throttle valve opening speed α may be suppressed as control to maintain the predetermined valve opening speed α1. In the above-described embodiment, the target valve opening speed α0, the predetermined valve opening speed α1, and the predetermined valve opening β1 are fixedly set, but these may be variably controlled.

[0039]

According to the throttle valve control device of the present invention,
The apparatus includes valve opening speed detecting means for detecting the opening speed of the throttle valve, and valve opening speed controlling means for controlling the opening speed of the throttle valve, wherein the valve opening speed controlling means is detected by the valve opening speed detecting means. Since the increase in the opening speed of the throttle valve is suppressed based on the opening speed of the throttle valve, the generation of abnormal noise during intake can be effectively suppressed or reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an internal combustion engine having one embodiment of a control device of the present invention.

FIG. 2 is a control flowchart according to an embodiment of the control device of the present invention.

FIG. 3 is a graph showing the relationship between the throttle valve opening and the opening speed during control.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine (internal combustion engine), 4 ... Intake path, 8 ... Throttle valve, 9 ... Throttle position sensor (valve opening degree detecting means / valve opening speed detecting means), 10 ... Throttle motor (valve opening speed controlling means), 11 ... ECU
(Valve opening speed detection means / valve opening speed control means), 1
2 ... Accelerator position sensor, 13 ... Accelerator pedal, 15 ... Transmission (transmission mechanism), 18 ... Gear position sensor (Gear position detecting means).

Claims (3)

[Claims] 1. A throttle valve control device provided in an intake passage of an internal combustion engine for controlling a throttle valve for adjusting an intake air amount of the internal combustion engine, wherein a valve opening speed detecting means for detecting an opening speed of the throttle valve; And a valve opening speed control means for controlling an opening speed of the throttle valve. The valve opening speed control means, based on the opening speed of the throttle valve detected by the valve opening speed detection means, opens the throttle valve. A throttle valve control device configured to suppress an increase in speed. 2. The vehicle according to claim 1, further comprising gear position detection means for detecting a gear position of a transmission mechanism for shifting an output of said internal combustion engine, wherein the gear position of said transmission mechanism detected by said gear position detection means is a neutral position or 2. The throttle valve control device according to claim 1, wherein the throttle valve control device is configured to suppress an increase in the opening speed of the throttle valve only in a parking position. 3. The apparatus according to claim 2, further comprising valve opening detection means for detecting an opening degree of the throttle valve, wherein the valve opening speed control means determines that the opening degree of the throttle valve detected by the valve opening detection means is a predetermined opening degree. 3. The throttle valve control device according to claim 1, wherein the throttle valve control device is configured to suppress an increase in the opening speed of the throttle valve only in the following cases.