JPH08319861A - Method and equipment for controlling internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a torque leap and an output leap while shifting from a partial load area to a full load area only by using an extremely small number of means and in turn to continuously increase the output of a vehicle during the operation of an internal combustion engine in the vehicle. SOLUTION: The position of a throttle valve is continuously variable up to a third position beyond a second position by almost constant air supply to an internal combustion engine, and the output of the internal combustion engine 1 is increased by control means 7, 8 almost continuously between the second position and third position interlockingly relative to the position of the throttle valve 3. To increase the output, the target value of air-fuel ratio control is changed from lean-burn to a stoichiometic air-fuel ratio according to the position of the throttle valve 3, or EGR is reduced, or spark advance is applied.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a method for controlling an internal combustion engine, in which the air supply to the internal combustion engine is influenced by an actuating device, and the air supply to the internal combustion engine is influenced by the actuating device. The position between the first position at which the air flow is at a minimum and the second position at which the air supply to the internal combustion engine is at a maximum, continuously changing in relation to the power demanded by the internal combustion engine, and Of the output of the actuator is changed by the control means in relation to the position of the actuator.

Furthermore, the present invention is a device for controlling an internal combustion engine, which is provided with an actuating device which influences the air supply to the internal combustion engine, the actuating device minimizing the air supply to the internal combustion engine. The position between the first position and the second position at which the air supply to the internal combustion engine is maximum is continuously variable in relation to the power demanded by the internal combustion engine, and It is of the type provided with control means for varying the output in relation to the position of said actuator.

[0003]

2. Description of the Related Art A method for operating an internal combustion engine in the full load range is known from EP 0142818. According to this known method, a throttle device for the amount of air supplied, which is adjustable by means of an acceleration lever, and a means for increasing the amount of fuel supplied, which can be connected at a defined position of this acceleration lever, are provided. used. In this known method, the throttling device is returned to the specified value at the beginning of the full load range, and when the full load range continues,
Fully opened again. On leaving the full load range, on the contrary, a change in the adjustment of the throttle device in the opening direction from the adjustment which is not fully opened results in an increase in the filling amount. In this case, the output jump of the internal combustion engine caused by the enrichment of the mixture at the start of the full load region, that is, the increase in the supplied fuel amount, the appropriate reduction of the filling amount, that is, the appropriate amount of the supplied air amount. At least fully compensated by the reduction. On the contrary, at the time of transition from the full load region to the upper partial load region, as a corresponding measure, the filling amount is increased and at the same time, the mixture enrichment is reduced. Such a method certainly smooths the transition between the two important areas, namely the partial load area and the full load area, but this method still results in an undesired output jump due to the return of the throttle device. It cannot be avoided entirely.

German Patent Application No. 441,661
No. 1 discloses a method and a device for controlling an internal combustion engine. In this method, for the purpose of avoiding torque jump and output jump of the internal combustion engine, an electrically actuated actuating device that affects the air supply to the internal combustion engine,
From the first operating region, which is characterized by a lean air-fuel ratio, to the second, which is characterized by a nearly stoichiometric air-fuel ratio.
During the changeover into the operating range, the jump is adjusted, in particular by a single jump, in which case the torque delivered by the internal combustion engine is substantially equal before and after the changeover. In this method, the actuating device is arranged after the throttle valve in the intake passage of the internal combustion engine. The actuating device is adjustable by an actuating motor and is connected to the control device. This control device controls other parameters of the internal combustion engine, such as gasoline injection, ignition advance and the like. Thus, the torque jump and the output jump of the internal combustion engine are sufficiently avoided.

However, the following drawbacks are recognized in the above method and the above apparatus. That is, the second throttle valve must be provided in addition to the general-purpose throttle valve. This not only requires increased technical effort in the manufacture and construction of the control unit of the internal combustion engine, but also leads to additional sources of failure and also increased manufacturing costs. Moreover, torque jumps cannot be completely eliminated with the method and apparatus for controlling an internal combustion engine.

[0006]

SUMMARY OF THE INVENTION The object of the invention is to improve a method and a device for controlling an internal combustion engine of the type mentioned at the outset, so that the total load range from the partial load range is reduced with very few means. It is an object of the present invention to provide a method and a device in which torque jumps and output jumps are avoided during the transition to the load range, and thus a vehicle driver is provided with a continuous increase in the output of the vehicle when operating an internal combustion engine in the vehicle.

[0007]

In the method of the present invention, in order to solve this problem, the position of the actuator is set to the second position.
Beyond the position of ## EQU1 ## with a substantially constant air supply to the internal combustion engine and continuously variable up to the third position, the output of the internal combustion engine being related to the position of the actuating device by the control means and interlocking with the position. Then, the pressure is increased almost continuously between the second position and the third position.

In order to solve the above-mentioned problems, in the structure of the device of the present invention, the position of the actuating device continues beyond its second position to the third position with a substantially constant air supply to the internal combustion engine. Variable, the output of the internal combustion engine can be continuously increased by the control means between the second position and the third position in relation to and in conjunction with the position of the actuating device. I did.

[0009]

According to the invention, it is particularly advantageous because, for example, a conventional throttle valve can be used as the actuating device. The conventional throttle valve is only slightly modified, in which case it goes beyond a second position which corresponds to the maximum air supply to the internal combustion engine, i.e. to the maximum open position of the throttle valve, Furthermore, it is possible to adjust continuously to the third position. In this third position, the air supply does not change compared to the second position, that is, it remains maximum. The range between the second position and the third position of the throttle valve is advantageous because it is used by the control means at the maximum air supply to the internal combustion engine to provide a smooth and continuous power increase of the internal combustion engine. is there. That is, the previously unused range of throttle valve positions can be used for the purpose of producing a continuous, non-exponential increase in the output and torque of the internal combustion engine.

Claims 2 and below and Claims 10 and below include:
An advantageous configuration of the method and the device according to the invention has been described.

For example, it is advantageous if the actuating device, ie the throttle valve known per se, is adjusted directly by the accelerator pedal.

The actuator may be a throttle valve regulated by an electronic accelerator pedal system.

The position of the throttle valve is preferably detected by a sensor element. The output side of this sensor element is connected to the input side of the control means. In this way, any change in the position of the throttle valve is directly converted by the control means into an increase in the output of the internal combustion engine.

Advantageously, the throttle valve is minimally open in the first position and maximally open in the second and third positions. The opening angle of the throttle valve is about 10 ° in the first position, about 80 ° in the second position, and the third position.
Advantageously, at a position of about 100 °. in this case,
The second position and the third position, that is, the opening angle of 80 ° and the opening angle of 100 °, do not differ with respect to the air supply to the internal combustion engine. The throttle valve position at an opening angle of 100 ° is, so to speak, only the "mirror image" position of a throttle valve having an opening angle of 80 °.

The target value of the control (excess air amount λ control) which influences the air-fuel ratio by the control means, for example, by reducing the exhaust gas recirculation or by the control means, changes from the stoichiometric amount to the stoichiometric amount. The throttle valve position between the second position and the third position by changing the stoichiometric mixture composition to a value and / or causing spark advance interference by the control means. It is advantageous for the output of the internal combustion engine to be increased continuously in connection with.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

The basic idea of the present invention is that, when a general-purpose throttle valve is used, it is carried out without a torque jump at the transition from the partial load region to the full load region with only a very small technical effort. It is an object of the present invention to provide a method and a device for controlling an internal combustion engine, which enables an increase in the output of

As shown in FIG. 1, the device for controlling the internal combustion engine 1 has a throttle valve 3 arranged in an air intake passage 2 through which the air sucked by the internal combustion engine 1 flows along the arrow A. are doing. The throttle valve 3 is mounted on a shaft 4 in a manner known per se.

The known positions of the throttle valve 3 are the first position corresponding to the minimum opening of the throttle valve 3, that is, the minimum air supply to the internal combustion engine 1, and the maximum opening of the throttle valve 3, that is, the maximum air supply to the internal combustion engine 1. It is possible to change continuously with the second position, which corresponds to the supply. In the known throttle valve, the minimum opening angle α of the throttle valve is about 10 ° and the maximum opening angle β of the throttle valve is about 80 °.

If the throttle valve 3 is opened further, that is to say for example to an opening angle of 90 °, no further increase of the air supply takes place. This is because the air supply at the open throttle valve is limited mainly by the diameter of the shaft 4.
A sensor 6, for example, a potentiometer is connected to the throttle valve 3. This sensor 6 detects the position of the throttle valve 3. The data detected by the sensor 6 is transmitted to the control means 7, 8. The control means 7 and 8 directly affect the output of the internal combustion engine 1 (for example, by reducing exhaust gas recirculation, switching from lean operation to full load operation, or ignition advance interference). Throttle valve 3
In order to continuously continuously increase the torque or the output of the internal combustion engine 1 when the engine is fully opened (for example, when the internal combustion engine 1 is operating in an automobile, the driver further operates the accelerator pedal connected to the throttle valve 3 in the increasing output direction). In this case, a throttle valve is provided that can be moved and adjusted beyond the maximum opening angle β to a third position, that is, a position corresponding to the opening angle γ.

Even if the position of the throttle valve changes from the second position corresponding to the opening angle β to the third position corresponding to the opening angle γ, preferably 100 °, the air supply to the internal combustion engine 1 changes. do not do. That is, the third position is, so to speak,
It is only in the "inverted" position of the maximum open position, which corresponds to the opening angle β of the throttle valve 3. Therefore, in this third position, the internal combustion engine 1 is likewise operated with maximum air supply.

Nevertheless, the continuous position change of the throttle valve from the second position (opening angle β) to the third position (opening angle γ) causes a sensor 6 in the constant air supply to the internal combustion engine 1. By means of which the control means 7, 8 can be activated and used to continuously increase the output or torque of the internal combustion engine.

This means, for example, that the external exhaust gas recirculation is continuously reduced or that the internal combustion engine is continuously operated in relation to the position of the throttle valve between the second and the third position. The target value of the control that switches from lean operation to full load operation, that is, the control that affects the air-fuel ratio (excess air amount λ control) is changed from a value that produces a lean mixture composition to a value that produces a stoichiometric mixture composition. It can be carried out either by varying it or by means of the control means 7, 8 by providing an ignition advance interference which additionally causes an output increase.

In FIG. 2, the free-open cross section of the throttle valve 3 is shown in relation to the throttle valve angle. As can be seen from FIG. 2, the free opening cross section of the throttle valve 3 changes from the first position corresponding to the opening angle α to the second opening corresponding to the opening angle β when the position of the throttle valve 3 changes.
Continuously increases to the position. On the other hand, between the second position (opening angle β) and the third position corresponding to the opening angle γ, the free-open cross section remains unchanged. That is, the air supply to the internal combustion engine 1 does not change.

FIG. 3 shows the output or torque of the internal combustion engine 1 in relation to the throttle valve angle. As can be seen from FIG. 3, the output or torque of the internal combustion engine 1 changes from the first position (opening angle α) of the throttle valve 3 to the second position.
Position (opening angle β), and further increases from the second position (opening angle β) of the throttle valve 3 to the third position (opening angle γ). Unlike known methods and devices for controlling the internal combustion engine 1, the internal combustion engine 1 is provided during the transition from the second position to the third position.
Output or torque change (shown by arrow B)
Does not occur. A smooth continuous increase in output or torque is obtained.

This means that the means for reducing the output is reduced by the control means 7, 8 as can be seen from FIG. 4 in which the reduction of the output or the reduction of the torque of the internal combustion engine 1 is shown in relation to the throttle valve angle. Achieved by

As already explained above, for example, the exhaust gas recirculation which causes a reduction in the output of the internal combustion engine 1 is associated with the third position (opening angle) in relation to the position of the throttle valve in the second position (opening angle β). Angle γ) is continuously reduced.

Also, as already described above, the internal combustion engine 1 is operated between the second position (opening angle β) and the third position (opening angle γ) by the control means 7 and 8 from the lean operation. It is also possible to switch to full load operation continuously. Furthermore, the control means may also provide (additional) spark advance interference.

The means for reducing the output or the torque is completely reduced continuously from the second position (opening angle β) to the third position (opening angle γ) without jumping.

In contrast to this, the conventional internal combustion engine control can only dramatically reduce the means for reducing the output at the second position (opening angle β) corresponding to the fully open position of the accelerator pedal. Only a dramatic increase in the output or torque of the internal combustion engine is possible (see arrow B in FIG. 3 and arrow C in FIG. 4).

As already mentioned above, a slightly modified throttle valve 3 can be used as the actuating device. Also, an electronic accelerator pedal system (not shown)
It is also possible to use

The advantages of the method and device according to the invention for controlling an internal combustion engine can be summarized as follows. That is, a slightly improved conventional throttle valve 3 can be used for controlling the internal combustion engine 1, and in this case, the operating range of the throttle valve 3 which has not been used in the past can output the output or torque. The reducing means are used to reduce continuously and in connection with the change of position of the throttle valve 3 between the second and third positions. As a result, the throttle valve 3 in an automobile is normally connected to the accelerator pedal, so that when the driver demands a further increase in output, the driver of the vehicle can increase the output of the internal combustion engine and thus the output of the vehicle by operating the accelerator pedal. Moreover, this power increase is performed completely from the partial load region to the full load region without jumping and without impact.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a cross section of a free opening of a throttle valve and a throttle valve opening angle.

FIG. 3 is a diagram showing a relationship between an output or torque of an internal combustion engine and a throttle valve opening angle.

FIG. 4 is a diagram showing a relationship between an output reduction or torque reduction of an internal combustion engine and a throttle valve opening angle.

[Explanation of symbols]

1 internal combustion engine, 2 air suction passage, 3 throttle valve, 4 shaft, 6 sensor, 7, 8 control means,
α, β, γ opening angle

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Johannes Maives Federal Republic of Germany Markgreningen Ulmenweg 25

Claims (16)

[Claims] 1. A method for controlling an internal combustion engine, in which the air supply to the internal combustion engine is influenced by an actuating device, and the air supply to the internal combustion engine is minimized by the actuating device. And the second position where the air supply to the internal combustion engine is maximum,
In a type in which the output of the internal combustion engine is continuously changed in relation to the power demanded by the internal combustion engine and the output of the internal combustion engine is changed by the control means in relation to the position of the actuator, the position of the actuator is Beyond the second position,
With a substantially constant air supply to the internal combustion engine (1), it is continuously variable to a third position, the output of the internal combustion engine (1) being related by the control means (7, 8) to the position of the actuating device, And a method for controlling an internal combustion engine, characterized in that it is increased substantially continuously between a second position and a third position in conjunction with said position. 2. The actuating device is a throttle valve (3) adjusted by an accelerator pedal.
The described method. 3. The method according to claim 1, wherein the actuating device is a throttle valve (3) adjusted by an electronic accelerator pedal system. 4. The method according to claim 1, wherein the throttle valve (3) is opened minimum in the first position and opened maximum in the second and third positions. 5. The opening angle of the throttle valve (3) is about 10 ° at the first position (opening angle α), about 80 ° at the second position (opening angle β), and the third position (opening angle). The method of claim 4, wherein γ) is about 100 °. 6. A throttle valve (3) for reducing exhaust gas recirculation by said control means (7, 8).
6. The method according to claim 1, wherein the output of the internal combustion engine (1) is increased between the second position and the third position. 7. A stoichiometric mixture composition is set to a target value of control (excess air amount λ control) that affects the air-fuel ratio by the control means (7, 8) from a value that produces a lean mixture composition. By changing to the value that produces
6. The method as claimed in claim 1, wherein the output of the internal combustion engine (1) is increased between the second position and the third position of the throttle valve (3). 8. The output of the internal combustion engine (1) between the second position and the third position of the throttle valve (3) is provided by performing ignition advance interference by the control means (7, 8). 6. The method according to any one of claims 1 to 5, which is increased. 9. A device for controlling an internal combustion engine, comprising an actuating device for influencing an air supply to the internal combustion engine, the actuating device providing a minimal air supply to the internal combustion engine. And a second position at which the air supply to the internal combustion engine is at a maximum, the position is continuously variable in relation to the power demanded by the internal combustion engine, and Of the type in which control means are provided which vary in relation to the position of the actuating device, the position of said actuating device exceeds its second position with a substantially constant air supply to the internal combustion engine (1). It is continuously variable to a third position, the output of the internal combustion engine (1) being related by the control means (7, 8) to the position of the actuating device and in conjunction with the second position. And between the third position continuously Device for controlling an internal combustion engine, characterized in that it is expandable. 10. Device according to claim 9, wherein the actuating device is a throttle valve (3) adjustable by an accelerator pedal. 11. The device according to claim 9, wherein the actuating device is a throttle valve (3) adjustable by an electronic accelerator pedal system. 12. The throttle valve according to claim 9, wherein the throttle valve (3) is minimum open in the first position and maximum open in the second position and the third position. The device according to the item. 13. The opening angle of the throttle valve (3) is
About 10 ° at the first position (opening angle α), about 80 ° at the second position (opening angle β), about 100 ° at the third position (opening angle γ)
13. The device according to claim 12, wherein 14. The control means (7, 8) reduces exhaust gas recirculation to reduce the output of the internal combustion engine (1) between the second and third positions of the throttle valve (3). 14. Any one of claims 9 to 13 in which an increase is made.
Item. 15. The control means (7, 8) determines a stoichiometric mixture composition from a target value of control (excess air amount λ control) that affects the air-fuel ratio, from a value that produces a lean mixture composition. The output of the internal combustion engine (1) is increased between the second position and the third position of the throttle valve (3) by changing to a value that results.
The apparatus according to any one of 3 to 3. 16. The output of the internal combustion engine (1) between the second position and the third position of the throttle valve (3) is caused by the ignition advance interference of the control means (7, 8). 14. A device according to any one of claims 9 to 13, wherein the augmentation is performed.