JPH05240083A - Intake air quantity controller of internal combustion engine - Google Patents

Abstract

PURPOSE:To surely prevent torque variation, deterioration of driving feeling and the like by decreasing an initial air bypass quantity by a specified quantity instantly when vehicle speed is in a specified range and OFF-action of an idling switch is started. CONSTITUTION:An air bypass valve 10 is arranged in a bypass passage which bypasses a throttle valve 6 and communicates to an intake passage 4, in the case of an internal combustion engine 2. In this case, a vehicle speed sensor, for instance an ignition coil 14 and an idling switch 16 are equipped in the internal combustion engine 2. The bypass valve 10 is controlled in a control part 12 based on respective detection signals of the ignition coil 14 and the idling switch 16. When vehicle speed is in a specified range and OFF-action of the idling switch 16 is started, an initial air bypass quantity is instantly decreased by a specified value. Additionally, when OFF-action of the idling switch 16 is continued and the vehicle speed is in the specified range, the air bypass quantity is increased step by step.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake air amount control system for an internal combustion engine, and more particularly to a bypass passage for bypassing a throttle valve and an air bypass valve provided in the middle of the bypass passage. The present invention relates to an intake air amount control device for an internal combustion engine, which controls the amount of air bypass air by opening and closing.

[0002]

2. Description of the Related Art When controlling the idle speed of an internal combustion engine, there are a method of controlling opening / closing of a throttle valve, a method of controlling an air bypass air amount by which the throttle valve is bypassed, and the like.

As an intake air amount control device for the internal combustion engine, there is one disclosed in Japanese Patent Application Laid-Open No. 62-267540. The electronically controlled fuel injection device for an internal combustion engine disclosed in this publication sets the fuel injection amount based on the detected values of the throttle valve opening and the engine rotation speed only during acceleration. The setting is made in a form commensurate with the actual intake air amount.

[0004]

In the conventional intake air amount control device for an internal combustion engine, the idle speed is controlled in accordance with the increase or decrease in the air bypass air amount that bypasses the throttle valve.

However, when a vehicle equipped with an internal combustion engine runs at a low speed, when the idle switch shifts from ON operation to OFF operation, that is, when a so-called throttle valve is opened from a fully closed state, a torque fluctuation is caused by a change in air bypass air amount. There is a problem that the driving feeling is deteriorated due to this torque fluctuation, such as a feeling of the vehicle jumping out.

As a countermeasure against this problem, it is possible to retard the ignition timing, reduce the fuel injection amount, or slowly open the throttle valve separately from the movement of the accelerator pedal.

However, if the ignition timing is retarded in order to improve the driving feeling, the ignition timing will deviate from the best ignition timing, resulting in deterioration of fuel efficiency and economical disadvantage.

Further, when the fuel injection amount is reduced, the air-fuel ratio becomes lean and the combustion state deteriorates, the exhaust gas cleaning function deteriorates, it is disadvantageous in practical use, and the fuel consumption deteriorates, which is economical. There is a disadvantage that it is disadvantageous.

Furthermore, if the throttle valve is opened separately from the operation of the accelerator pedal, a mechanism for opening the throttle valve is required, which increases the size, complicates the structure, makes the manufacturing difficult, and increases the cost. There is a disadvantage that it is economically disadvantageous.

[0010]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an air bypass valve in the middle of a bypass passage arranged to bypass the throttle valve and opens and closes the air bypass valve. In an intake air amount control device for an internal combustion engine that controls a bypass air amount, a vehicle speed sensor that detects a vehicle speed of the internal combustion engine is provided, and an idle switch that is turned on when a throttle opening of the throttle valve is in an idle state is provided, By inputting the detection signal of the vehicle speed sensor and the operation signal of the idle switch, the vehicle speed is within a predetermined range and the initial air bypass air amount is instantly decreased by a predetermined amount when the idle switch is turned off, and the idle switch is turned off. When the operation is continued and the vehicle speed is within the specified range, Characterized in that a control unit for controlling so as to increase stepwise the initial air bypass air quantity or the air bypass air amount until each satisfying a predetermined condition after reduction control of Abaipasu air quantity.

[0011]

According to the invention as described above, when the vehicle speed is within the predetermined range and the idle operation of the idle switch is started, the initial air bypass air amount is instantly decreased by the predetermined amount by the control unit, and the idle switch is operated. When the OFF operation is continued and the vehicle speed is within the predetermined range, the air bypass is continued until it becomes equal to or more than the initial air bypass air amount every time the predetermined condition is satisfied by the control unit after the initial air bypass air amount reduction control. The air amount is controlled to be increased step by step, and the deterioration of the driving feeling such as the feeling of the vehicle jumping out due to the torque fluctuation is reliably prevented, and the driving feeling is improved.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 5 show an embodiment of the present invention. In FIG. 2, 2 is an internal combustion engine, 4 is an intake passage,
Reference numeral 6 is a throttle valve.

A bypass for bypassing the throttle valve 6 by connecting one end to the intake passage 4 upstream of the throttle valve 6 of the internal combustion engine 2 and the other end to the intake passage 4 downstream of the throttle valve 6. Passage 8
An air bypass valve 10 for idle speed control is provided in the middle of the bypass passage 8 and a control unit 12 for opening and closing the air bypass valve 10 to control the amount of air bypass air is provided.

Further, a vehicle speed sensor, for example, an ignition coil 14 is provided in the internal combustion engine 2, the ignition coil 14 is connected to the control unit 12, and the vehicle speed is detected by an ignition pulse from the ignition coil 14.

Further, an idle switch 16 that is turned on when the throttle opening of the throttle valve 6 is in an idle state is provided, and the ignition coil 14 and the idle switch 16 are provided in communication with the control unit 12.

Then, the control unit 12 inputs the detection signal from the ignition coil 14 and the operation signal of the idle switch 16 so that the vehicle speed is within a predetermined range and the idle switch 1
When the OFF operation of 6 starts, the initial air bypass air amount is instantly decreased by a predetermined amount, and when the idle switch 16 continues the OFF operation and the vehicle speed is within the predetermined range, the initial air bypass air amount is Every time the predetermined condition is satisfied after the decrease control, the air bypass air amount is controlled to be increased stepwise until the air bypass air amount becomes equal to or more than the initial amount.

More specifically, the control unit 12 determines that the vehicle speed is within the range in which the vehicle speed is equal to or lower than the first set vehicle speed X and exceeds the second set vehicle speed Y, and the idle switch 16 is turned off.
At the start of the operation, the control value DISC of the air bypass valve 10 is set to the control value DISC0 of the air bypass valve 10 when the condition is satisfied, and the engine speed NE is set to the engine speed NE0 when the condition is satisfied. The control value DISC of the air bypass valve 10 for controlling the amount is set to a predetermined amount, for example, the control value DIS of the air bypass valve 10 according to the engine speed NE0 when the condition is satisfied.
The control is performed so as to instantly decrease the amount of C DISCMIN.

Further, the control unit 12 uses the idle switch 1
When 6 continues the OFF operation and the vehicle speed is less than the first set vehicle speed X and exceeds the second set vehicle speed Y, the subtraction amount DISCMIN is initialized from the control value DISC of the air bypass valve 10. After the control for reducing the air bypass air amount is performed, a predetermined condition, for example, a state in which the idle switch 16 continues to be OFF, and the vehicle speed range is the above-described second set vehicle speed Y <vehicle speed ≦ first
Every time the two conditions of the set vehicle speed X are satisfied, for example, the addition value ΔDISC of the predetermined control value DISC of the air bypass valve 10 is added to the control value DISC of the air bypass valve 10 after the reduction control to obtain the initial air bypass air. It is repeatedly controlled until the control value DISC of the air bypass valve 10 for controlling the amount becomes equal to or more than the control value DISC.

Next, the operation will be described with reference to the control flow chart of the intake air amount control device for the internal combustion engine 2.

When the internal combustion engine 2 is started, the intake air amount control program is started (100), and whether the vehicle speed is within the range of second set vehicle speed Y <vehicle speed ≦ first set vehicle speed X. A judgment (102) is made.

When the determination (102) is YES, whether the idle switch 16 has changed from the ON operation to the OFF operation, that is, the idle switch 16 is turned OFF.
It is judged whether the operation is started (104), and the judgment (10
If 2) is NO, the routine is repeated until the determination (102) becomes YES.

If the above judgment (104) is YES, the control value DISC of the air bypass valve 10 is increased.
The control value DIS of the air bypass valve 10 when the condition is satisfied
In addition to setting C0, the engine speed NE is set to the engine speed NE0 when the condition is satisfied (106), and the determination (10
If 4) is NO, the process returns to the determination (102) and the routine is repeated until the determination (102) becomes YES.

After the processing (106), the air bypass valve 1 according to the engine speed NE0 when the condition is satisfied from the control value DISC0 of the air bypass valve 10 when the condition is satisfied.
The control value DISC of the air bypass valve 10 is obtained by subtracting DISCMIN from the control value DISC of 0, and the air bypass air amount is instantaneously reduced by the control value DISC of the air bypass valve 10 (108).

At this time, the air bypass valve 10
As shown in FIG. 5, the subtraction amount DISCMIN of the control value DISC of is obtained by a preset map as the subtraction amount DISCMIN of the control value DISC of the air bypass valve 10 according to the engine speed NE0 when the condition is satisfied. It can be determined according to the engine speed NE0 at the time of establishment.

Further, the air bypass air amount reduction processing (1
08), a determination (110) is made as to whether or not the idle switch 16 has changed from the OFF operation to the ON operation. If the determination (110) is NO, the vehicle speed is equal to or lower than the first set vehicle speed X and 2 It is judged whether or not it is within the range exceeding the set vehicle speed Y (112). If the judgment (110) is YES, the control value DISC0 of the air bypass valve 10 when the condition described later is satisfied is set to the air value. Bypass valve 1
The process proceeds to the process (122) for setting the control value DISC of 0.

If the above determination (112) is YES, that is, if the vehicle speed is within the range of the second set vehicle speed Y <the vehicle speed ≦ the first set vehicle speed X, the control value DISC of the air bypass valve 10 after the reduction control is set. A predetermined addition amount ΔDISC is added, the control value DISC of the air bypass valve 10 is calculated, and control is performed to increase the air bypass air amount (114).

If the judgment (112) is NO,
The control value DISC0 of the air bypass valve 10 when the conditions described later are satisfied is set to the control value DISC of the air bypass valve 10.
The processing is changed to (122).

Next, the idle switch 16 is turned off again.
From the operation, it is judged whether the ON operation is performed (116),
If this judgment (116) is NO, it is judged (118) whether the vehicle speed is equal to or lower than the first set vehicle speed X and exceeds the second set vehicle speed Y, and the judgment (1
When 16) is YES, the control value DISC0 of the air bypass valve 10 at the time when the condition is satisfied, which will be described later, is set to the control value DISC of the air bypass valve 10 (122).

The judgment (118) is YES, that is, the vehicle speed is
When the second set vehicle speed Y <the vehicle speed ≦ the first set vehicle speed X, the control value DISC of the air bypass valve 10 when the control value DISC of the air bypass valve 10 is satisfied is satisfied.
A determination (120) is made as to whether or not the above.

If the judgment (118) is NO,
The control value DISC0 of the air bypass valve 10 when the conditions described later are satisfied is set to the control value DISC of the air bypass valve 10.
The processing is changed to (122).

If the above judgment (120) is NO,
The control value DISC of the air bypass valve 10 is added with a predetermined addition amount ΔDISC to calculate the control value DISC of the air bypass valve 10, and the process proceeds to processing (114) for controlling to increase the air bypass air amount. The control value DISC of 10 is repeated until the control value DISC of the air bypass valve 10 when the condition is satisfied is equal to or more than the control value DISC0 of the air bypass valve 10 when the condition is satisfied.
Is set to the control value DISC of the air bypass valve 10 (122), and then it is determined whether the above vehicle speed is within the range of second set vehicle speed Y <vehicle speed ≦ first set vehicle speed X (102). ).

Thus, when the vehicle equipped with the internal combustion engine 2 travels at a low speed, the idle switch 16 shifts from the ON operation to the OFF operation, that is, when the so-called throttle valve is opened from the fully closed state, the air bypass air amount is set appropriately. It is possible to reduce the torque to a stable state and to increase it in stages after that, so that torque fluctuations can be prevented, and it is possible to reliably prevent deterioration of the driving feeling such as the feeling of the vehicle jumping out due to the torque fluctuations. Feeling can be improved.

Further, since the driving feeling can be improved, the ignition timing is retarded to deteriorate the fuel consumption, and the fuel injection amount is decreased to deteriorate the exhaust gas cleaning function and deteriorate the fuel consumption. There are no various inconveniences such as inviting or opening the throttle valve separately from the operation of the accelerator pedal to complicate the configuration and increase the cost, and it is practically and economically advantageous.

Further, as shown in FIG. 4, since the controllable range of the air bypass air amount by the air bypass valve 10 can be made large, the control corresponding range becomes large and the versatility of the air bypass air amount control can be achieved. Is large, which is practically advantageous.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, the control value DISC of the air bypass valve is controlled by the control unit.
When instantly reducing the air bypass air amount by
The subtraction amount DISCMIN of the air bypass valve control value DISC according to the engine speed NE0 when the condition is satisfied is obtained from a preset map, and the subtraction amount DISCMI from the air bypass valve control value DISC0 when the condition is satisfied.
The control value DISC of the air bypass valve is calculated by subtracting N. However, as shown in FIG. 6A, the subtraction amount DISCMIN of the control value DISC of the air bypass valve according to the engine speed NE0 when the condition is satisfied. The control value DI of the air bypass valve when the condition is satisfied is obtained by a preset map with a numerical value of 1 or less, as shown in FIG.
It is also possible to configure the control unit to obtain the control value DISC of the air bypass valve by multiplying SC0 by the subtracted amount DISCMIN.

When the control value DISC0 of the air bypass valve when the condition is satisfied is multiplied by the subtraction amount DISCMIN to obtain the control value DISC of the air bypass valve, the control value of the air bypass valve 10 after the reduction control is adopted. Predetermined air bypass valve 1 added to DISC
The addition amount ΔDISC of the control value DISC of 0 is calculated by the formula ΔDISC = DISC0 * ΔDISC%.

[0039]

As described above in detail, according to the present invention, the vehicle speed sensor for detecting the vehicle speed of the internal combustion engine is provided, and when the throttle opening of the throttle valve is in the idle state,
An idle switch for N operation is provided, the detection signal of the vehicle speed sensor and the operation signal of the idle switch are input, the vehicle speed is within a predetermined range, and the initial air bypass air amount is instantaneously set to a predetermined amount when the idle switch OFF operation starts. When the idle switch continues to be turned off and the vehicle speed is within the predetermined range, the initial air bypass air amount is set to be not less than the initial air bypass air amount each time the predetermined condition is satisfied after the initial air bypass air amount reduction control. Since a control unit for controlling the amount of air bypass air to be increased step by step is provided, when the vehicle equipped with the internal combustion engine runs at low speed, the so-called throttle valve in which the idle switch shifts from ON operation to OFF operation is operated. When releasing from the closed state,
The amount of air bypass air can be controlled to decrease to an appropriate state and then increased stepwise, torque fluctuations can be prevented, and deterioration of the driving feeling such as the feeling of the vehicle jumping out due to the torque fluctuations is ensured. It can be prevented and the driving feeling can be improved. In addition, by improving the driving feeling, the ignition timing may be retarded to deteriorate fuel efficiency, or the fuel injection amount may be decreased to deteriorate exhaust gas cleaning function or deteriorate fuel efficiency, or There are no various inconveniences such as opening the throttle valve separately from the operation of the accelerator pedal to complicate the structure and increase the cost, and it is practically and economically advantageous.

[Brief description of drawings]

FIG. 1 is a control flowchart for an intake air amount control system for an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of an intake air amount control device for an internal combustion engine.

FIG. 3 is a time chart showing a control state of an intake air amount control device for an internal combustion engine.

FIG. 4 is a diagram showing a controllable range of an air bypass air amount by an air bypass valve.

FIG. 5 is a map showing a relationship between an engine speed NE0 and a subtraction amount DISCMIN of an air bypass valve control value DISC when a condition is satisfied.

FIG. 6 (a) is a map showing the relationship between the engine speed NE0 and the subtraction amount DISCMIN of the control value DISC of the air bypass valve when the conditions are satisfied, showing another embodiment of the present invention. (B) Air bypass valve control value DIS when the condition is satisfied
FIG. 6 is a schematic diagram showing an operation of multiplying C0 by a subtraction amount DISCMIN to obtain a control value DISC of the air bypass valve.

[Explanation of symbols]

 2 Internal combustion engine 4 Intake passage 6 Throttle valve 8 Bypass passage 10 Air bypass valve 12 Control unit 14 Ignition coil 16 Idle switch

Claims (1)

[Claims] 1. An intake air amount control device for an internal combustion engine, wherein an air bypass valve is provided midway in a bypass passage arranged to bypass a throttle valve, and the air bypass valve is opened / closed to control an air bypass air amount. Provided with a vehicle speed sensor that detects the vehicle speed of the engine,
An idle switch that is turned on when the throttle opening of the throttle valve is in an idle state is provided, and a detection signal of the vehicle speed sensor and an operation signal of the idle switch are input, and the vehicle speed is within a predetermined range and the idle switch is turned off. At the start, the initial air bypass air amount is instantly reduced by a predetermined amount and the idle switch is turned off.
When the F operation is continued and the vehicle speed is within the predetermined range, the air bypass air amount is increased until it becomes equal to or larger than the initial air bypass air amount every time the predetermined condition is satisfied after the initial air bypass air amount reduction control. An intake air amount control device for an internal combustion engine, which is provided with a control unit for controlling the intake air amount to be increased.