JP2549123Y2 - Throttle control device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a slot for an internal combustion engine.
Torque control equipment, especially as a diesel engine
The mechanically designed engine is Otto cycle engine
Useful for compressed natural gas engines used as
It relates to a throttle control device.

[0002]

2. Description of the Related Art Among internal combustion engines, Otto cycle energy
Engine, a slot provided in the intake air passage
Valve by the amount of depression of the accelerator connected to it.
Control the opening and closing of the intake
Depending on the volume, fuel injection valve or cap bre
A quantity of fuel is supplied to the engine. An example
For example, do not put a load on the engine and throttle
If the valve is fully open, the engine speed may increase.
The engine torque at this time is approximately as shown in FIG.
It changes like the solid line. And such Otto
In a cycle engine, a specific engine speed (for example,
For example, when Ne1) in FIG.
The maximum output depends on the engine torque obtained at this time.
The mechanical design is made as obtained. In addition,
In a toe-cycle engine, the engine
The engine speed Ne increases and the engine torque
Engine changes according to the characteristics shown by the solid line in FIG.
Is designed so that it does not break.

On the other hand, in diesel engines,
There is no throttle valve in the air inlet passage.
And a controller that is displaced according to the amount of depression of the accelerator pedal.
Fuel supplied from the fuel injection valve by the trawl rack
The injection amount is controlled. General diesel engine in recent years
In this case, the fuel injection amount,
The position of the rack is determined by the so-called “governor mechanism”.
The engine torque is controlled according to the engine speed Ne
(So-called “governor characteristics”).

In particular, when the diesel engine is in a no-load condition
And the accelerator pedal is fully depressed
Sometimes, the engine speed Ne is equal to a predetermined speed (for example,
For example, until the engine torque reaches Ne1) in FIG.
The injection amount is controlled so that it is almost constant
I have. (For example, “Dee published on May 28, 1986
Zell Passenger Car Latest Technology "Pages 94-95
page. )

As described above, in a diesel engine,
When the accelerator pedal is fully depressed,
Fuel system regardless of changes in engine speed.
By controlling the injection amount to be substantially constant, a substantially constant engine
Gin torque is achieved, giving the driver a certain feeling of acceleration,
Drive ability is improved (Fig. 5
, The maximum output when the engine speed is the predetermined value Ne1
Is obtained. ). And the highest output
If the predetermined value Ne1 is achieved, the fuel supply
By gradually decreasing the supply, the engine speed Ne
When the number of revolutions (for example, the predetermined value Ne2 in FIG. 5) is reached
The fuel supply amount is set to approximately “0” and the engine speed
Make sure that the number does not exceed Ne2 (overspeed).
ing.

A diesel engine having such a configuration is
The accelerator pedal as fully as described above.
Even if the engine speed Ne rises, the governor mechanism
, Approximately one-dot chain line in FIG. 5 (however,
Best at the same engine speed as the Otto cycle engine
Engine output N), the engine speed N
Until e reaches the predetermined value Ne1, the engine torque is kept constant.
After that, control is performed so that the engine torque becomes “0”.
The mechanical design of the diesel engine
In this case, even if the output changes according to this characteristic,
The design is made so that the gin does not break.

[0007]

[Problem to be solved by the invention] By the way, diesel
Compression heaven that converted the engine to an Otto cycle engine
Natural gas engines (CNG engines) require mechanical design.
It is a characteristic of diesel engine. Thus, this C
The NG engine is an Otto cycle engine
If no improvements are made, diesel engines and
Differences in engine characteristics from the toe cycle engine (Fig. 5
Difference between the dashed line and the solid line) indicates that the CNG engine
It was found that the mechanical strength of the resin became insufficient. That is,
The CNG engine is basically an Otto cycle engine
The accelerator pedal is fully depressed when there is no load.
When it is inserted (at this time, the throttle valve is also fully open),
Same speed as the diesel engine (Ne1 in Fig. 5)
In order to achieve the maximum output, the odd line shown by the solid line in FIG.
According to the characteristics of the toe cycle engine, the engine speed
Ne generates an engine torque according to Ne,
The rotation speed Ne exceeds the rotation speed Ne1 at which the maximum output is achieved.
Furthermore, the rotational speed exceeds the mechanically permitted rotational speed Ne2.
As a result, so-called “overspeed” occurs, and the engine exceeds mechanical strength.
There is a risk that

The present invention has been made in view of such circumstances.
So in the Otto cycle engine, the throttle
Even if the valve reaches the maximum opening, its engine
Limit the number of turns and thus prevent engine destruction
To provide a throttle control device that can be stopped
With the goal.

[0009]

Means for Solving the Problems In order to achieve the above object,
The invention according to claim 1 of the application is provided in an intake air passage.
The main throttle valve connected to the accelerator pedal
A sub-drive provided in the air inlet passage and driven by the driving means
A throttle valve and a throttle for outputting a drive signal to the drive means.
A throttle control device equipped with a rotary control circuit
Engine speed detecting means for detecting the engine speed
And a main throttle for detecting the opening of the main throttle valve.
Opening detection means connected to the throttle control circuit;
The throttle control circuit has an engine
Maximum throttle opening (TVX) set according to speed
And at least the main throttle opening
The opening detected by the detecting means is the maximum slot.
Throttle opening (TVX)
The circuit indicates that the opening of the sub throttle valve is
So that the driving means is smaller than the opening degree (TVX).
The drive signal is output.
According to a second aspect of the present invention, there is provided a device provided in an intake air passage.
The main throttle valve connected to the accelerator pedal
A sub-drive provided in the air inlet passage and driven by the driving means
A throttle valve and a throttle for outputting a drive signal to the drive means.
A throttle control device equipped with a rotary control circuit
The engine speed detector that detects the engine speed
Stage and a main slot for detecting the opening of the main throttle valve
The throttle opening detection means is connected to the throttle control circuit.
The throttle control circuit includes the engine speed
The number is equal to or higher than the first predetermined rotation speed and equal to or lower than the second predetermined rotation speed.
When the engine speed increases,
Also, it is set to be fully closed at the second predetermined number of revolutions.
The specified maximum throttle opening (TVX) is stored.
The engine detected by the engine speed detecting means.
The rotation speed exceeds the first predetermined rotation speed, and
The opening detected by the throttle opening detector is above
When the maximum throttle opening (TVX) is exceeded,
The throttle control circuit stores the opening of the sub throttle valve
It is maximum throttle opening (TVX) and so as to the
The driving means may output the driving signal.
It is.

[0010]

According to the invention, the main throttle is provided.
The valve opening is set to the maximum speed set according to the engine speed.
When the throttle opening is exceeded, the auxiliary throttle valve
Because the throttle is controlled to a large throttle opening, the engine speed
The engine torque obtained at this time along with the rise
Control so that the engine output is not exceeded.
Limited. According to the invention of claim 2, the maximum
Rotor opening exceeds engine speed 1st predetermined value
Sometimes it becomes smaller as the engine speed rises and
It is set to be fully closed when it reaches the second predetermined value.
Therefore, the engine speed is different from the first predetermined value and the second predetermined value.
When the engine speed increases.
As a result, the engine torque is controlled to decrease.
In order to achieve the maximum output at the first predetermined value,
The engine torque gradually increases as the engine speed increases.
So-called exceeding the second predetermined number of revolutions
An over-rotation state can be avoided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings.
It will be described in the light of the above. FIG. 1 shows a throttle control device according to this embodiment.
FIG. 2 is an explanatory diagram showing the entire configuration of the device 10. As shown in this figure
Thus, the throttle control device 10
And connected to the accelerator pedal 2 via a wire 3.
Main throttle valve 4 and also provided in the intake air passage 1.
Sub slot which is driven by a motor (drive means) 5
A throttle valve 6 and a slot for outputting a drive signal to the motor 5;
A torque control circuit A and an engine for detecting an engine speed;
Engine speed sensor (engine speed detecting means) 9
An opening sensor (main slot) for detecting the opening of the rottle valve 4
Opening degree detecting means) 7. In addition, above
The engine speed sensor 9 and the throttle opening sensor 8
Both are electrically connected to the throttle control circuit A
You. The opening of the auxiliary throttle valve 6 is detected.
The throttle opening sensor 8 is connected and the throttle opening
The degree sensor 8 is also electrically connected to the throttle control circuit A.
ing.

Incidentally, the throttle control circuit A includes:
The storage means (not shown) has Ne-T
The VX table (FIG. 3) is stored. And the details
As will be described later, air from the engine speed sensor 9 is detected.
The engine speed is determined based on a signal representing the engine speed Ne.
Reads the maximum throttle opening TVX according to the rotation number Ne
Then, the read value TVX and the throttle opening sensor
Compare opening TV1 of main throttle valve 4 detected at 7
Then, based on the result of this comparison,
A drive signal for controlling the opening of the motor is output to the motor 5.
You.

Next, a sub-control by the throttle control circuit A will be described.
FIG. 2 is a flowchart showing the control of the throttle valve 6.
It will be described according to. The professional shown in this flowchart
The gram is generated every time a predetermined period elapses (for example, generation of a TDC signal).
Each time) in the throttle control circuit A. this
When the program is started, first, in step S1,
The engine speed Ne at the time is the engine speed sensor 9
Is read based on the signal from
In the figure, based on the read engine speed Ne,
3 from the Ne-TVX table shown in FIG.
The maximum throttle opening TVX according to Ne is read out.
You. In the next step S3, the main throttle at this point
The actual opening TV1 of the valve 4 is obtained from the throttle opening sensor 7.
Is read based on the signal of Read like this
Engine speed Ne, throttle opening TV1 and reading
To the maximum throttle opening TVX in this loop
Based on the sub slots in the following steps S4 to S9,
The control of the throttle valve 6 is performed.

First, in step S4, for example, the main
The opening degree TV1 of the throttle valve 4 is a predetermined value TV indicating an abnormality.
It is determined whether it is greater than zero. The result of this determination is “Y
es ", that is, if the main throttle valve 4 is abnormal
In step S5, the sub-throttle valve 5 is fully
A drive signal for closing is generated, and the process proceeds to step S9.
Then, the drive signal is output to the motor 5. On the other hand,
When the determination result of step S4 is "No", that is, when the main slot
When it is determined that the throttle valve 4 is operating normally,
Proceed to step S6.

In step S6, the read in step S3 is performed.
The opening degree TV1 of the main throttle valve 4 is determined in step S2.
, The maximum data read from the Ne-TVX table (FIG. 5).
It is determined whether or not it is larger than the rotary opening TVX.

By the way, the maximum throttle opening TVX is
For Otto cycle engines, the engine speed
Ne and engine torque depend exclusively on the intake air volume
In view of the change (solid line in FIG. 5), the engine
This intake air amount is changed according to the number of turns Ne to the actual main slot.
Limit regardless of the opening TV1 of the
This is to make the characteristics of the engine. Thus, the main slot
When the throttle valve 4 exceeds the maximum throttle opening TVX.
In this case, the amount of air flowing through the intake air passage 1 is
The throttle valve 6 to the maximum throttle opening TVX.
Therefore, the restriction is made regardless of the opening of the main throttle valve 4.
It will be. In other words, the opening of the auxiliary throttle valve 6
(TV2) is the maximum slot according to the engine speed Ne.
Controlling the opening degree TVX of the intake air passage 1
The opening area is substantially changed according to the engine speed Ne.
It is to make it.

Determining the maximum throttle opening TVX
Ne-TVX table (FIG. 3) for this embodiment
Until the engine speed Ne reaches the first predetermined value Ne1.
Then, it is almost constant (slight irregularities depending on individual engine characteristics)
Has occurred. ), The first predetermined value Ne1
And then gradually decreases to the second predetermined value Ne2.
The opening is set at the second predetermined value Ne2.
Is set to be approximately “0”.

With such a setting, the odds
Toe cycle engines (for example, CNG engines)
The main throttle vane 4 has this maximum throttle opening
If TVX is exceeded, the actual main throttle valve 4 is opened.
Regardless of the degree, the amount of intake air supplied to the engine is desired
Can be controlled to the optimum value that produces the engine torque of
(For example, the engine torque is indicated by a dashed line in FIG. 5).
Can be set to a value according to the engine speed Ne
).

Therefore, the same mechanical properties as the diesel engine are used.
Otto rhinos, such as CNG engines, that have been designed
The same cycle for diesel engines as for diesel engines
Even if the maximum output can be obtained with the number of turns (Ne1),
At load and when the main throttle valve is fully open, the engine speed
Ne does not exceed the second predetermined value Ne2 (excessive
(Prevention of rotation), and there is no danger of the engine being broken. I
If the engine speed Ne is equal to or less than Ne1,
Comfortable drive ability with constant engine torque
Achieved.

As described above, in step 6 of FIG.
The opening degree TV1 of the throttle valve 4 is equal to the maximum throttle opening.
Is compared with TVX.
The engine torque at the engine speed Ne.
Is not greater than the value shown by the dashed line in FIG.
Then, in step S7, the opening of the sub throttle valve 6 is fully opened.
A drive signal for performing the operation is generated.
And outputs the drive signal to the motor 5. this is,
At this time, the opening TV1 of the main throttle valve 4 is
The above maximum set to avoid the risk of gin destruction
Because it is smaller than the throttle opening TVX,
Intake air according to the opening degree TV1 (<TVX) of the throttle valve 4
However, even if supplied to the engine, there is no risk of engine destruction
Because.

On the other hand, if the result of the determination in step S6 is "Y
es ", that is, the opening degree TV1 of the main throttle valve 7
Is the maximum speed set according to the engine speed Ne.
By the time the lot Le opening TVX greater, step S8
The opening degree TV2 of the sub throttle valve 6 is set to the maximum
Generates a drive signal for setting the rotary opening TVX.
You. In this case, based on the signal from the throttle opening sensor 8,
The actual opening TV of the sub-throttle valve 6 at this time is
2 is read, and this value TV2 and the maximum throttle opening
And the content of the drive signal is determined.
You. The drive signal determined in this manner is then transmitted to the motor 5
(Step S9).

As described above, as described in the first embodiment,
According to the throttle control device, the opening of the main throttle valve 4
TV1 is set in advance according to the engine speed Ne.
When it exceeds the maximum throttle opening TVX,
In response to a signal from the rotary control circuit A,
The opening TV2 is controlled to the maximum throttle opening TVX.
Therefore, the driver's depression amount of the accelerator pedal 3 (immediately
That is, regardless of the opening degree TV1) of the main throttle valve 4, suction is performed.
Because the air volume is limited, the engine torque
It is controlled to a value (dotted line in FIG. 4) corresponding to the rotation speed Ne.
You. Therefore, the mechanical design of a diesel engine
The performed engine is replaced with the Otto cycle engine
This throttle control device is used for the converted CNG engine.
When using the Otto cycle engine,
Automatically corrected according to the characteristics of the diesel engine
Of the engine that would have occurred if simply diverted
Eliminate the possibility of destruction.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The throttle system of the second embodiment
In the control device 20, the throttle control circuit A of the first embodiment is used.
, A throttle control circuit B is used.

FIG . 4 shows the inside of the throttle control circuit B.
It is a block diagram showing an example of a composition. As shown in this figure
The throttle control circuit B is provided with a throttle opening sensor.
Input circuits 11A, 11B to which 7, 8 are connected, slots
Analog signals (TV1, TV
A / D converter that converts a signal representing
Signals from the inverters 12 and 13 and the engine speed sensor 9
And the throttle opening TV converted into the digital signal
1 is input, and the maximum
The TVX determination circuit 14 for determining the rottle opening TVX,
The throttle opening TV2 converted into the digital signal is
And the maximum signal from the TVX decision circuit 14
The signal representing the throttle opening TVX and the signal of the sub throttle valve 6
A drive signal is output by comparing with a signal representing the opening degree TV2.
Sub throttle opening determination circuit 15 and the circuit 15
A drive circuit 16 for amplifying these signals and outputting them to the motor 5;
It is constituted by.

[0025] The throttle control circuit B is connected to the
As with the throttle control circuit A of the first embodiment, the engine
The maximum throttle TVX read according to the number of turns Ne is
It is compared with the opening degree TV1 and, according to the result of the comparison, the auxiliary switch
The opening degree TV2 of the rotary valve 6 is determined by the maximum throttle opening degree T.
VX, when no load is applied, and the main throttle valve 6
Substantially inhaled when almost fully opened (when TV1> TVX)
Controls the opening area of the air passage to reduce the engine torque.
Control and the engine speed Ne is allowed
To avoid exceeding (Ne2) (overspeed)
It is. The control of the auxiliary throttle valve 6 is performed in the first embodiment.
This is performed according to the flowchart of FIG.

[0026] Further, the throttle control circuit B has
Receives a signal from the engine speed sensor 9 to
An overspeed detection circuit 17 for detecting the overspeed
7 based on a signal from the fuel injection valve (not shown)
And a fuel cutoff circuit 18 for cutting off fuel injection.
You. Thus, the overspeed detection circuit 17 detects the engine speed N
e has exceeded a second predetermined value Ne2 shown in FIG.
Is constantly monitored and when the value exceeds the second predetermined value Ne2
And outputs a signal to that effect to the fuel cutoff circuit 18.
I do. Then, the fuel cutoff circuit 18 performs the overspeed detection circuit.
Overspeed signal from road 17 Based on the
Stop fuel injection to engine by fuel injection valve
You.

[0027] The throttle control circuit B has such a circuit structure.
In this case, the engine speed Ne is set to the second predetermined value.
When the value exceeds the value Ne2, the auxiliary throttle valve 5 is fully closed.
The shutoff of the intake air volume and the fuel supply
The engine may overrun.
And the destruction of the engine is reliably prevented.

[0028]

As described above, according to the first aspect of the present invention,
According to the invention, the driver fully depresses the accelerator pedal.
Even if the main throttle valve is fully open,
Secondary throttle valve is set according to engine speed
The main throttle valve is controlled to the maximum throttle opening.
Regardless of the degree of opening, the intake air volume is
It does not exceed the value corresponding to the opening. Thus,
Ottosa with the same mechanical design as the diesel engine
Apply the invention to the cycle engine (CNG engine)
The main throttle in the Otto cycle engine
Even when the valve is fully opened, the engine torque at this time
The value can be set according to the engine speed.
To prevent engine torque from causing destruction
can do. Further, according to the invention of claim 2,
If the engine speed exceeds the first predetermined value,
The secondary throttle valve is gradually fully closed as the engine speed increases.
Control to increase the engine speed.
Accordingly, the intake air amount is reduced, and the intake air amount is reduced at the second predetermined value.
Make the amount of incoming air substantially “0” and exceed the second predetermined value
(Over rotation) can be prevented,
Can be avoided.

[Brief description of the drawings]

FIG. 1 shows a throttle control device according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing the entire configuration of the embodiment.

FIG. 2 is a diagram for controlling an opening degree TV2 of a sub throttle valve .
It is a flowchart.

FIG. 3 shows N for reading a maximum throttle opening TVX .
It is a graph showing an e-TVX table.

FIG. 4 is a throttle control device according to a second embodiment of the present invention;
FIG. 2 is a block diagram showing the entire configuration of the embodiment.

FIG. 5 shows a case where the maximum engine output value is achieved at the same rotational speed.
Combined Otto cycle engine and diesel engine
It is a graph which showed each characteristic.

[Explanation of symbols]

A Throttle control circuit 1 Intake air passage 2 Accelerator pedal 4 Main throttle valve 5 Motor (drive means) 6 Sub throttle valve 7 Main throttle opening sensor 8 Sub throttle opening sensor 9 Engine speed sensor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location F02D 41/04 310 F02D 41/04 310F 41/22 310 41/22 310E (72) Inventor Tatsushi Miyata Nissan Diesel Kogyo Co., Ltd., 1-1-1, Oaza, Ageo City, Saitama Prefecture (56) References JP-A-2-213352 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] An access passage provided in an intake air passage.
A main throttle valve (4) connected to a throttle pedal (2) and an intake air passage (1), and a driving means (5).
A throttle valve (6) that is driven by a throttle and a throttle control that outputs a drive signal to the driving means (5).
An engine speed detecting means for detecting an engine speed in a throttle control device having a control circuit (A).
(9) a main slot for detecting the opening of the main throttle valve (4)
The throttle opening detecting means (7) is connected to the throttle control circuit (A).
The maximum throttle opening (TVX) set according to the number
At least by the main throttle opening detection means (7).
The detected opening is the maximum throttle opening (TV)
X), the throttle control circuit (A)
However, the opening of the auxiliary throttle valve (6) is
The driving means so as to be smaller than the torque opening (TVX).
(5) to be being configured to output the drive signal
A throttle control device. An access passage provided in the intake air passage;
A main throttle valve (4) connected to a throttle pedal (2) and an intake air passage (1), and a driving means (5).
A throttle valve (6) that is driven by a throttle and a throttle control that outputs a drive signal to the driving means (5).
An engine speed detecting means for detecting an engine speed in a throttle control device having a control circuit (A).
(9) a main slot for detecting the opening of the main throttle valve (4)
The throttle opening detecting means (7) is connected to the throttle control circuit (A), and the throttle control circuit (A) detects the engine speed.
The second predetermined rotation speed which is equal to or more than the first predetermined rotation speed (Ne1)
(Ne2) or less, the engine speed increases
And the second predetermined rotation speed (Ne)
Maximum slot set to be fully closed in 2)
The engine opening is stored and detected by the engine speed detecting means (9).
The engine speed is equal to the first predetermined speed (Ne1).
And the main throttle opening detection means (7)
Is detected as the maximum throttle opening (TV).
X), the throttle control circuit (A)
However, the opening degree of the auxiliary throttle valve (6) is the maximum stored in the above.
The above-mentioned driving means so that the throttle opening (TVX) is obtained.
(5) to be being adapted to output to the drive signal
A throttle control device.