JPH062574A - Throttle valve control device of internal combustion engine for vehicle - Google Patents

Abstract

PURPOSE:To perform traveling of a vehicle even at the time of abnormality by a simple constitution. CONSTITUTION:In a device of controlling a motor 5 and an opening of a throttle valve 2 in an intake pipe 1 in accordance with an accelerator opening detected by an accelerator opening sensor 26, a throttle opener 8 for opening the throttle valve 2 by a predetermined amount against energizing force of a spring 4 by introducing a pressure in the intake pipe 1 to an action chamber 16 to move a rod 10 and a control valve 22 capable of connecting the action chamber 16 to and disconnecting it from a side of the atmosphere are provided. Abnormality generated in control of the throttle valve 2 is detected, to inhibit driving the motor 5 at abnormality time, to also open the throttle valve 2 by the throttle opener 8 by a predetermined amount by opening the control valve 22, and traveling can be performed even at the time of abnormality.

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 an internal combustion engine for a vehicle, and more particularly to a throttle valve control for an internal combustion engine for a vehicle in which a throttle valve is driven by a driving means such as a motor in accordance with the depression amount of an accelerator pedal. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, a sensor detects an accelerator opening degree according to a depression amount of an accelerator pedal operated by a driver, and a throttle valve is driven by a motor or the like according to the accelerator opening degree. It is known to control the opening of a throttle valve.

In such a device, when an abnormality occurs in the sensor, the motor, or the control system, the throttle valve may be left open. Therefore, the throttle valve is always closed by a spring or the like. The throttle valve is configured to be closed when it is biased and an abnormality occurs. However, when an abnormality occurs, the throttle valve is closed, which makes it impossible to drive to a service factory or home by itself, and it is also impossible to run to a safe area nearby.

Therefore, as disclosed in Japanese Patent Laid-Open No. 61-8441, an auxiliary air control valve is provided in the auxiliary air passage bypassing the throttle valve, and when the abnormality occurs, the auxiliary air control valve is driven to flow through the auxiliary air passage. It is known that the amount of air is increased and the rotational speed of the internal combustion engine is increased to some extent to allow the vehicle to run on its own.

[0005]

However, in such a conventional device, since the auxiliary air passage bypassing the throttle valve and the auxiliary air control valve are used, it is considered that these passages and valves for idle control are used. However, in order to make the vehicle self-propelled in the event of an abnormality, an auxiliary air passage and an auxiliary air control valve must be provided without fail, and there is a problem that the device becomes complicated and large.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a throttle valve control device for an internal combustion engine for a vehicle, which has a simple structure and which enables the vehicle to travel by itself even in an abnormal condition.

[0007]

In order to achieve such an object, the present invention has the following constitution as means for solving the problem. That is, as illustrated in FIG. 1, the accelerator opening degree detecting means M1 for detecting the accelerator opening degree according to the depression amount of the accelerator pedal, and the throttle valve M3 provided in the intake pipe M2 are biased in the closing direction. A valve closing means M4, a valve driving means M5 for driving the throttle valve M3 to open and close against an urging force, and a valve driving means M5 controlled according to the accelerator opening to open the throttle valve M3. In a throttle valve control device for an internal combustion engine for a vehicle, which includes a throttle control means M6 for controlling the degree, the rod is moved by introducing the pressure in the intake pipe M2 into the working chamber, and the throttle valve M3 is closed. A throttle opener M7 for opening a predetermined amount against the urging force of the valve means M4, a control valve M8 capable of connecting / disconnecting the working chamber and the atmosphere side, and the valve. An abnormality detecting means M9 for detecting an abnormality occurring in the control of the throttle valve M3 based on the driving means M5, and prohibiting the driving of the valve driving means M5 by the throttle control means M6 at the time of the abnormality, and at the same time controlling the control valve M8. A throttle valve control device for an internal combustion engine for a vehicle, comprising: an abnormal state control means M10 for opening the throttle valve M3 by a predetermined amount by the throttle opener M7.

[0008]

In the throttle valve control device for an internal combustion engine for a vehicle having the above structure, the accelerator opening detection means M1 detects the accelerator opening according to the depression amount of the accelerator pedal, and the throttle control means M6 detects the accelerator opening. According to the above, the valve drive means M5 is controlled, and the valve drive means M5 drives the throttle valve M3 against the biasing force of the valve closing means M4 to control the opening degree of the throttle valve M3.

The abnormality detecting means M9 is the valve driving means M5.
When it is detected that an abnormality has occurred in the control of the throttle valve M3 based on the above, the abnormality control means M10 prohibits the throttle control means M6 from driving the valve drive means M5. Therefore, the valve closing means M4 drives the throttle valve M3 in the valve closing direction. Further, the abnormal time control means M10 is
The control valve M8 is opened to communicate the working chamber with the atmosphere side, and the throttle opener M7 opens the throttle valve M3 by a predetermined amount to maintain the operation of the internal combustion engine.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 is a schematic configuration diagram of a throttle valve control device for an internal combustion engine for a vehicle according to an embodiment of the present invention. 1
Is an intake pipe, and a throttle valve 2 is provided in the intake pipe 1.
Is arranged so as to be swingable, and the intake pipe 1 can be communicated / blocked by swinging the throttle valve 2.

An arm portion 3 is projected from the throttle valve 2. Between the arm portion 3 and the fixed side,
A spring 4 as a valve closing means M4 is stretched to urge the throttle valve 2 in the valve closing direction. Valve closing means M
The spring 4 is not limited to the spring 4, and may be any spring that can bias the throttle valve 2 in the valve closing direction, and may be a spring spring or the like.

The throttle valve 2 is constructed so as to be opened and closed by a motor 5 as a valve driving means M5 against the urging force of the spring 4, and the throttle valve 2 driven by the motor 5 is driven. The opening is
It is configured to be detected by the throttle opening sensor 6.

A throttle opener 8 is provided near the intake pipe 1, and a tip of a rod 10 of the throttle opener 8 is arranged so as to face the arm portion 4. The other end of the rod 10 is fixed to a diaphragm 12 and is partitioned by the diaphragm 12 to form a working chamber 16.

The spring 1 installed in the working chamber 16
The rod 10 is pushed out by the urging force of the spring 4, and the tip of the rod 10 abuts on the arm 3 to open the throttle valve 2 by a predetermined amount against the urging force of the spring 4. The throttle opening at this time is set to such an extent that the vehicle can travel by itself so that the rotation speed of the internal combustion engine is about 1000 to 1500 rpm.

Further, the working chamber 16 is provided downstream of the throttle valve 2 of the intake pipe 1 by the negative pressure introducing passage 18,
The rod 10 is communicated with the intake pipe 1 and is configured to drive the rod 10 in a direction away from the arm portion 3 against the biasing force of the spring 14 under the action of the negative pressure introduced into the working chamber 16. Has been done.

An intake passage 20 communicating with the atmosphere side is branched from the negative pressure introduction passage 18, and a control valve 22 is provided in the intake passage 20. This control valve 22
Normally, it is an open / close valve that shuts off the intake passage 20 and opens the valve to communicate the intake passage 20 when an excitation signal is input.

On the other hand, an accelerator opening sensor 26 is provided as an accelerator opening detecting means M1 for detecting an accelerator opening corresponding to the amount of depression of an accelerator pedal 24 operated by the driver's depression, and the motor The throttle opening sensor 5, the control valve 22, and the accelerator opening sensor 26 are connected to an electronic control circuit 30.

The electronic control circuit 30 includes a well-known CPU 32,
ROM3 that stores control programs and data in advance
4, a readable / writable RAM 36 is configured as a logical operation circuit, and a motor drive circuit 36, a motor relay drive circuit 38, a control valve drive circuit 40, and an analog-digital conversion circuit 42 are connected to each other via a common bus 43. And is configured to perform input / output with the outside.

Then, the CPU 32 inputs the throttle opening signal from the throttle opening sensor 6 and the accelerator opening signal from the accelerator opening sensor 26 via the analog-digital conversion circuit 42. Also these signals,
The CPU 32 outputs a drive signal to the motor 5 and the control valve 22 through the motor drive circuit 36, the motor relay drive circuit 38, and the control valve drive circuit 40 based on the programs and data in the ROM 34 and the RAM 36, and the throttle valve. 2 is configured to be controlled.

The motor drive circuit 36 is connected to the battery 44 via the relay 46, receives a signal from the CPU 32, and outputs a drive signal to the motor 5. Further, the motor relay drive circuit 38 receives a signal from the CPU 32, outputs an excitation signal to the relay 46, and connects / disconnects the battery 44 and the motor drive circuit 36.

Next, the operation of the throttle valve control device for an internal combustion engine for a vehicle of this embodiment will be described with reference to the flow charts of FIGS. When the internal combustion engine (not shown) is stopped, the pressure in the intake pipe 1 is almost the same as the atmospheric pressure, and the same is true in the working chamber 16 that communicates with the intake pipe 1 via the negative pressure introduction passage 18. Therefore, the rod 10
Is pushed out by the urging force of the spring 14 and abuts on the arm portion 3, swings the throttle valve 2 as shown by the solid line in FIG. 2, and separates the throttle valve 2 from the inner wall of the intake pipe 1.

This prevents the throttle valve 2 from freezing or sticking to the inner wall of the intake pipe 1, and drives the throttle valve 2 with the driving force of the motor 5 when the operation of the internal combustion engine is started next time. I am able to do so. When the operation is started, first, the electronic control circuit 30 outputs an excitation signal to the relay 46 via the motor relay drive circuit 38, and the battery 44 and the motor drive circuit 36 are connected. In addition, the control valve 22 is kept closed.

When the internal combustion engine rotates, the intake pipe 1
The internal pressure becomes a negative pressure, and the negative pressure in the intake pipe 1 is introduced into the working chamber 16 via the negative pressure introducing passage 18. By the introduction of this negative pressure, the rod 10 is pulled against the biasing force of the spring 14 as shown by the chain double-dashed line in FIG. Therefore, the throttle valve 2 can be swung in the entire range from the fully closed state to the fully open state without the swing being restricted by the rod 10.

In the present embodiment, the throttle valve 2 is controlled by the electronic control circuit 30 during idle operation so that a predetermined idle speed is achieved even if the accelerator opening is zero.
Are driven by the motor 5. Therefore, in this embodiment,
In order to maintain the idle rotation, there is no passage that bypasses the throttle valve 2.

During operation of the internal combustion engine, the abnormality flag setting process shown in FIG. 3 is executed every predetermined time. First, the accelerator opening θA detected by the accelerator opening sensor 26 is passed through the analog-digital conversion circuit 42. Is read (step 100). Next, the throttle opening θR detected by the throttle opening sensor 6 is read via the analog-digital conversion circuit 42 (step 105).

Subsequently, the accelerator opening θA is subtracted from the read throttle opening θR multiplied by the coefficient α to calculate the deviation θ (= αθR-θA) (step 11).
0). The absolute value of this deviation θ is a predetermined value a
It is determined whether or not the following (step 115).

That is, the accelerator opening degree θA and the throttle opening degree θR move with a certain correlation during normal operation. Therefore, if the difference between them exceeds a predetermined value a, it is abnormal. It can be judged that there is. For example, when the abnormality occurs, the accelerator opening sensor 26 fails and the accurate accelerator opening signal is not output, or the throttle opening sensor 6 fails and the accurate throttle opening signal is output. For example, when it is gone. In addition, even if the sensor is normal, the motor 5 and the motor drive circuit 36 fail,
This is a case where the motor 5 does not operate normally.

Therefore, when the deviation θ exceeds the predetermined value a, it is judged to be abnormal, and the abnormality flag F is set to 1 (step 120). Further, when the process of step 120 is executed, or when the deviation θ is equal to or smaller than the predetermined value a, the process of step 120 is not executed.
This control process is once ended. The execution of this abnormality flag setting process works as the abnormality detecting means M9.

Further, in the throttle valve control process shown in FIG. 4, first, the accelerator opening degree θA is read (step 200), and the target value θT of the throttle opening degree is calculated from this accelerator opening degree θA (step 205). Next, after reading the throttle opening θR (step 210),
It is determined whether the abnormality flag F set by the abnormality flag setting process is 1 (step 215).

When the sensor or the like operates normally and no abnormality occurs, the throttle opening θR is subtracted from the target value θT to calculate the deviation d (= θT-θR) (step 2).
20). Next, based on the calculated deviation d, a drive signal is output to the motor 5 via the motor drive circuit 36,
The motor 5 is driven to control the throttle opening of the throttle valve 2 so as to reach the target value θT (step 22).
5).

As a result, according to the accelerator opening θA,
The motor 5 is controlled to control the throttle opening θR of the throttle valve. The execution of the processing of steps 200 to 225 functions as throttle control means M6. On the other hand, by executing the processing of step 215, the abnormality flag F
When it is determined that the value is 1, the output of the drive signal to the motor 5 via the motor drive circuit 36 is stopped (step 230). Then, the output of the excitation signal to the relay 46 via the motor relay drive circuit 38 is stopped, and the battery 44 and the motor drive circuit 36 are disconnected (step 23).
5). As a result, the throttle valve 2 is swung in the valve closing direction by the spring 4.

Next, an excitation signal is output to the control valve 22 via the control valve drive circuit 40, and the control valve 22 is opened (step 240). By opening the control valve 22, the working chamber 16 is communicated with the atmosphere side via the suction passage 20, and the inside of the working chamber 16 is brought to substantially atmospheric pressure.

Therefore, the rod 10 is projected into the intake pipe 1 by the urging force of the spring 14 as shown by the solid line in FIG. 2, and the tip of the rod 10 abuts on the arm 3. Then, the throttle valve 2 is opened by a predetermined amount against the biasing force of the spring 4. Steps 225 and 24
When the processing of 0 is executed, this control processing is once terminated. still,
The execution of the processing of steps 215 and 230 to 240 works as the abnormal time control means M10.

Therefore, air is taken into the internal combustion engine in accordance with the throttle opening, and the minimum rotation that allows self-propelling is maintained. Therefore, the vehicle can run on its own to a repair shop, a home, or a nearby safety zone. As described above, in the throttle valve control device for the internal combustion engine for a vehicle according to this embodiment, when the throttle valve 2 is driven by the motor 5, the throttle opener 8 is provided. With a simple configuration, the vehicle can run on its own even in abnormal situations.

In this embodiment, the idle speed control is also
Since the throttle valve 2 is driven by the motor 5, the auxiliary air passage and the auxiliary air control valve for bypassing the throttle valve 2 for idle control are not provided.
Even if the auxiliary air passage and the auxiliary air control valve are not provided, the throttle opener 8 is used to open the throttle valve 2 by a predetermined amount at the time of an abnormality, so that a simple configuration of adding the control valve 22 can be used. But it enables the vehicle to run on its own.

Further, unlike the present embodiment, even if the auxiliary air passage for the idle control and the auxiliary air control valve are provided, it is easy to add the control valve 22 by using the throttle opener 8. With such a configuration, it is possible to make the vehicle self-propelled even in the event of an abnormality.

That is, the present invention can be applied to a structure provided with an auxiliary air passage and an auxiliary air control valve, or a structure not provided with these, and the throttle opener 8 is used to control the control valve 22. With a simple configuration to add, it is possible to drive the vehicle even in abnormal situations.

The present invention is not limited to the embodiments as described above, and can be carried out in various modes without departing from the gist of the present invention.

[0039]

As described in detail above, the throttle valve control device for an internal combustion engine for a vehicle according to the present invention has a simple structure in which a control valve is added by using a throttle opener, so that the vehicle can be self-propelled even in an abnormal condition. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a basic configuration of a throttle valve control device for an internal combustion engine for a vehicle according to the present invention.

FIG. 2 is a schematic configuration diagram of a throttle valve control device for an internal combustion engine for a vehicle as an embodiment of the present invention.

FIG. 3 is a flowchart showing an example of an abnormality flag setting process performed by the electronic control circuit of this embodiment.

FIG. 4 is a flowchart showing an example of a throttle valve control process performed by an electronic control circuit of this embodiment.

[Explanation of symbols]

M1 ... Accelerator opening detection means M2, 1 ... Intake pipe M3, 2 ... Throttle valve M4 ... Valve closing means M5 ... Valve driving means M6 ... Throttle control means M7, 8 ... Throttle opener M8, 22 ...
Control valve M9 ... Abnormality detection means M10 ... Abnormality control means 4 ... Spring 5 ... Motor 6 ... Throttle opening sensor 10 ... Rod 16 ... Working chamber 18 ...
Negative pressure introduction passage 20 ... Suction passage 26 ... Accelerator opening sensor 30 ... Electronic control circuit

Claims (1)

[Claims] 1. An accelerator opening detecting means for detecting an accelerator opening degree according to a depression amount of an accelerator pedal, a valve closing means for urging a throttle valve provided in an intake pipe in a valve closing direction, and the throttle valve. For a vehicle provided with a valve drive means for opening and closing the valve against an urging force, and a throttle control means for controlling the valve drive means according to the accelerator opening to control the opening of the throttle valve. In a throttle valve control device for an internal combustion engine, a throttle opener that moves a rod by introducing pressure in the intake pipe into a working chamber, and opens the throttle valve by a predetermined amount against the biasing force of the valve closing means. A control valve capable of connecting and disconnecting the working chamber and the atmosphere side, and detecting an abnormality caused in the control of the throttle valve based on the valve driving means. An abnormality detecting means, and an abnormality control means for prohibiting the driving of the valve driving means by the throttle control means at the time of the abnormality and for opening the control valve to open the throttle valve by a predetermined amount by the throttle opener. A throttle valve control device for an internal combustion engine for a vehicle, comprising: