JPH0552133A - Throttle controller of internal combustion engine - Google Patents

Abstract

PURPOSE:To decrease a pumping loss by driving each throttle valve and each opening/closing valve in their open/close state when a required intake air quantity of an engine set in response to the stepping-in angle of an acceleration pedal is more than the intake sir quantity at the time of fully opening the opening/closing valve, and driving only the opening/closing valve in its open/ close state when the required intake air quantity is less than the intake air quantity. CONSTITUTION:A butterfly type throttle valve 2 is interposed in an intake passage 1 independently formed per cylinder, and is driven in its open/close state by a first electromagnetic actuator acting as each throttle driving unit. Each bypass passage 3 acting as a communication passage which bypasses each throttle valve is formed, and each opening/closing valve 4 is interposed in the each bypass passage 3. Each opening/closing valve 4 is stroke-driven by a second electromagnetic actuator 5 acting as a valve drive device. Consequently, each opening/closing valve 4 and each throttle valve 2 are driven by a required intake air quantity of an engine set according to the stepping-in angle of an acceleration pedal, so as to decrease a pumping loss, promote mixing with fuel and improve fuel consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle control device for an internal combustion engine capable of reducing pumping loss.

[0002]

2. Description of the Related Art The following is a conventional example of a throttle control device for an internal combustion engine (Japanese Patent Laid-Open No. 1-2193).
17). That is, a throttle valve that interlocks with the accelerator pedal for each cylinder is installed in the intake passage,
An on-off valve is provided in each bypass passage that bypasses each of the throttle valves.

Then, in conjunction with the opening / closing operation of the intake valve,
The on-off valve is opened, for example, from the first half of the combustion stroke to the second half of the exhaust stroke, and a large amount of intake air is introduced into the intake passage downstream of the throttle valve to reduce pumping loss.

[0004]

However, since the throttle valve is interlocked with the accelerator pedal, the throttle valve opening is always maintained at an angle corresponding to the depression angle of the accelerator pedal. Circulate. Therefore, there is a problem that fuel and intake air are not sufficiently mixed and fuel efficiency deteriorates.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a throttle control device capable of improving fuel efficiency while reducing pumping loss.

[0006]

Therefore, according to the present invention, as shown in FIG. 1, a throttle valve A provided in each cylinder and provided in an intake passage communicating with the intake valve of each cylinder, and each throttle valve. A throttle drive device B that opens and closes the valve A; a communication passage that communicates at least with an intake passage downstream of each throttle valve A; and an on-off valve C that opens and closes each communication passage.
A valve drive device D that opens and closes each on-off valve, a depression angle detection means E that detects a depression angle of an accelerator pedal, a demand intake setting means F that sets an engine required intake amount based on the detected depression angle, Comparing means G for comparing the set required intake air amount with the intake air amount flowing through the communication passage when the on-off valve is substantially fully opened; and when the required intake air amount exceeds the intake air amount,
The valve drive device is drive-controlled in conjunction with the opening / closing operation of the intake valve to fully open the opening / closing valve, and the throttle drive device is driven to open the throttle valve A by a predetermined amount according to the required intake amount. First drive control means H for controlling, when the required intake air amount is equal to or less than the intake air amount, the throttle drive device is drive-controlled to fully close the throttle valve, and the opening / closing valve C is set to the required intake air amount. Accordingly, the second drive control means I for controlling the drive of the drive device D by interlocking with the opening / closing operation of the intake valve to open the valve by a predetermined amount.
And so on.

[0007]

The throttle valve is configured to be opened and closed by the throttle drive device, and the required intake air amount of the engine is set based on the depression angle of the accelerator pedal. And
The required intake air amount and the intake air amount that flows through the communication passage when the on-off valve is substantially fully opened are compared, and when the required intake air amount exceeds the intake air amount, the on-off valve is made to fully open in conjunction with the opening / closing operation of the intake valve, While opening the throttle valve by a predetermined amount, when the required intake air amount is less than the intake air amount, the throttle valve is almost fully closed regardless of the depression angle of the Arcel pedal and only the open / close valve is opened / closed in conjunction with the opening / closing operation of the intake valve. I decided to do it.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, butterfly type throttle valves 2 are respectively installed in an intake passage 1 formed independently for each cylinder, and each throttle valve 2 is operated by a first electromagnetic actuator (not shown) as a throttle drive device. It is opened and closed respectively. A bypass passage 3 is formed as a communication passage that bypasses each throttle valve 2, and an opening / closing valve 4 is provided in each bypass passage 3. Each on-off valve 4 is stroke-driven by a second electromagnetic actuator 5 as a valve drive device.

The first and second electromagnetic actuators are
Energization is controlled by the control device 6 to open / close the feeder valve 2 and the opening / closing valve 4. The control device 6 includes a reference signal from the crank angle sensor 7 (every 180 ° crank angle in a four-cylinder engine) and a position signal, and a stepping angle detecting means for detecting a stepping angle of an accelerator pedal (not shown). The detection signal from the accelerator pedal angle sensor 8 and the detection signal from the throttle sensor 9 that detects the opening of the throttle valve 2 are input. Here, the volume of the intake passage 1 from the throttle valve 2 to the intake valve 10 is the maximum volume of the combustion chamber 11 (combustion chamber volume when the piston is at the top dead center).
It is set to about 1/2.

Here, the control device 6 constitutes the required intake air amount setting means, the comparison means, and the first and second drive control means. At S1, various signals from the crank angle sensor 6 and the like are read. In S2, the target total angle αT corresponding to the required intake air amount required by the engine is searched from the map based on the detected engine rotation speed and accelerator depression angle (engine load). The target total angle αT is a value obtained by adding the opening α1 of the throttle valve 2 and the equivalent opening α2 of the opening / closing valve 4, and at a predetermined engine speed, as the accelerator depression angle increases as shown in FIG. It is set to be high. The equivalent opening α2 is a value obtained by converting the stroke amount of the opening / closing valve 4 into the opening amount of the pattern valve 2 at the same intake air amount.

At S3, the retrieved target total angle α
It is determined whether T exceeds the maximum opening equivalent value αMAX. If YES, it is determined that the actual opening is insufficient and S
If NO in step 4, the process proceeds to step S6. The maximum opening equivalent value α2MAX is the same as the intake amount flowing through the bypass passage 3 when the opening / closing valve 4 is fully opened. It corresponds to the opening degree of the valve 2.

In S4, the target opening of the print valve 2 is set so as to increase the opening of the print valve 2 in the opening direction by a predetermined opening according to the target total angle. At S5, the stroke amount (target opening) of the on-off valve 4 is set to the maximum opening equivalent value α2MA.
Set to X (fully open). On the other hand, when it is determined that the target total angle αT is α2MAX or less, in S6,
The target opening of the throttle valve 2 is set to the minimum opening α1 in order to fully close the throttle valve 2.

In S7, the minimum opening α1 is subtracted from the target total angle αT, and the on-off valve 4 is opened based on the subtracted value.
The stroke amount of is set so that the opening degree becomes an intermediate opening degree. Then, the first electromagnetic actuator and the second electromagnetic actuator 5 are energized so that the set target opening and stroke amount are achieved, and the opening of the throttle valve 2 and the opening / closing valve 4 is controlled. As a result, when the target total angle αT set according to the accelerator pedal depression angle exceeds α2MAX corresponding to the intake air amount when the opening / closing valve 4 is fully opened, the opening / closing valve 4 is fully opened and the throttle valve 2 is set to the predetermined value. The intake air amount required by the engine is secured by controlling the intermediate opening degree.
On the other hand, when the target total angle is less than α2MAX,
The throttle valve 2 is fully closed, the throttle amount of the open / close valve 4 is controlled according to the target total angle, and the required intake air amount of the engine is secured only by the open / close control of the open / close valve 4.

During acceleration operation, the throttle valve 2 is driven to open a little later than the time when the target total angle exceeds α2MAX. Further, during deceleration operation, the throttle valve 2 is fully closed slightly earlier than when the target total angle becomes equal to or less than α2MAX, and the opening / closing control is performed only by the opening / closing valve 4. In this way, the on-off valve 4 is mainly driven to be opened and closed to secure the required intake air amount.
The turbulence of the intake air flow introduced from the bypass passage 3 into the intake passage 1 can sufficiently improve the mixing property with the fuel, and the fuel efficiency can be significantly improved. Further, since the throttle valve 2 is opened late during the acceleration operation, the intake flow from the bypass passage 3 greatly promotes the mixing with the fuel, so that the acceleration performance is maintained and the fuel consumption is improved. Can be greatly improved. In addition, the throttle valve 2 should be used earlier during deceleration operation.
Since it is fully closed, fuel efficiency can be greatly improved even at this time.

Further, the on-off valve 2 is, like the conventional example,
At the start of the intake stroke when the intake valve 10 starts to open, the intake valve 10 is opened in association with the opening / closing operation of the intake valve 10 from the compression stroke to the combustion stroke so that the intake pressure downstream of the throttle valve 2 becomes substantially atmospheric pressure. As a result, the pumping loss can be reduced as in the embodiment.

[0016]

As described above, the present invention opens and closes the throttle valve and the opening / closing valve when the required intake air amount of the engine set according to the depression angle of the accelerator pedal exceeds the intake air amount when the opening / closing valve is fully opened. When the required intake air amount is less than the intake air amount, the throttle valve is fully closed and only the open / close valve is opened / closed, so pumping loss is reduced and mixing with fuel is promoted to significantly improve fuel efficiency. it can.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a claim of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a flowchart of the above.

FIG. 4 is a view for explaining the operation of the above.

[Explanation of symbols]

1 ... Intake passage 5 ... 2nd electromagnetic actuator 2 ... Throttle valve 6 ... Control device 3 ... Bypass passage 8 ... Accelerator pedal angle sensor 4 ... Open / close valve

Claims (1)

[Claims] 1. A throttle valve which is provided for each cylinder and which is provided in an intake passage communicating with an intake valve of each cylinder, a throttle drive device which drives the opening and closing of each throttle valve, and an intake passage downstream of each throttle valve. At least communication passages, open / close valves for opening / closing these communication passages, a valve drive device for opening / closing each open / close valve, a stepping angle detecting means for detecting a stepping angle of an accelerator pedal, and a detected stepping angle. A required intake amount setting means for setting an engine required intake amount based on the above, a comparing means for comparing the set required intake amount with the intake amount flowing through the previous communication passage when the on-off valve is substantially fully opened, and the required intake amount is When the intake amount is exceeded, the valve drive device is drive-controlled in conjunction with the opening / closing operation of the intake valve so that the opening / closing valve is fully opened, and the throttle valve is controlled according to the required intake amount. First drive control means for driving and controlling the throttle drive device to perform a constant valve opening drive; and drive control of the throttle drive device to fully close the throttle valve when the required intake air amount is less than or equal to the intake air amount. A second drive control means for drivingly controlling the valve drive device in conjunction with an opening / closing operation of an intake valve so as to drive the opening / closing valve by a predetermined amount according to the required intake air amount. Control system for internal combustion engine.