JPH06146913A - Supercharging pressure control device - Google Patents

Abstract

PURPOSE:To improve output at the time of transient operation so as to improve running feeling by controlling super charging pressure at the time of transient operation of an internal combustion engine by high side supercharging pressure high than an objective supercharging pressure at the time of normal operation. CONSTITUTION:Supercharging pressure produced by a supercharger 12 is controlled to an objective supercharging pressure according to operating condition of an internal combustion engine 2 provided with the supercharger 12. Namely, in the case where supercharging pressure increase execution condition is set up at the time of transient operation of the internal combustion engine 2, supercharging pressure produced by the supercharger 12 is controlled to be increased to a supercharging pressure on high side supercharging pressure higher than the objective supercharging pressure. In the case where supercharging pressure damping executing condition is set up, high side supercharging pressure is controlled to be damped gradually to the objective supercharging pressure. A control unit 64 which is a means for forming a supercharging pressure control device is provided. It is thus possible to temporarily control supercharging pressure to high side supercharging pressure higher than the objective supercharging pressure at the time of normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharging pressure controller, and more particularly to a supercharging pressure during transient operation of an internal combustion engine which can be controlled to a higher supercharging pressure higher than a target supercharging pressure during steady operation. Accordingly, the present invention relates to a supercharging pressure control device capable of improving output during transient operation, improving followability and improving traveling feeling.

[0002]

2. Description of the Related Art Some internal combustion engines mounted on vehicles have a supercharger for supercharging and supplying intake air. The supercharging pressure by the supercharger is controlled to the target supercharging pressure by the supercharging pressure control device.

As a supercharging pressure control device, Japanese Patent Laid-Open No. 60-2
There is one disclosed in Japanese Patent Publication No. 49618. The supercharging pressure control device disclosed in this publication controls the supercharging pressure by the supercharger to a target supercharging pressure according to the operating state of the internal combustion engine, and is a pressure response device for controlling the supercharging pressure. A supercharging pressure introducing passage and an atmospheric pressure introducing passage are connected to the pressure chamber, and control valves for opening and closing the supercharging pressure introducing passage and the atmospheric pressure introducing passage are provided.

[0004]

In the conventional supercharging pressure control device, the target supercharging pressure is set for each operating state of the internal combustion engine, for example, every engine speed.
The supercharging pressure control device controls the supercharging pressure by the supercharger so as to be the target supercharging pressure set for each engine speed when the internal combustion engine is operating.

Therefore, the conventional supercharging pressure control device sets the target supercharging pressure for each engine speed, so that it is required during steady operation of the internal combustion engine and during transient operation such as starting and climbing. Despite the different output, the target boost pressure is controlled to the same.

Therefore, the conventional supercharging pressure control device controls the supercharging pressure to the target supercharging pressure which is set to a constant value, so that the output required during the transient operation cannot be satisfied. is there. In particular, in an internal combustion engine equipped with an automatic transmission, internal slip of the torque converter causes a problem in that followability is deteriorated during transient operation such as starting and climbing, and traveling feeling is deteriorated.

If the target supercharging pressure is set higher in order to eliminate such inconvenience, the output required in the transient operation can be satisfied, while the output in the steady operation is less than the required output. Therefore, there is a disadvantage that the durability of the internal combustion engine or the supercharger is adversely affected and the fuel consumption is disadvantageous.

[0008]

SUMMARY OF THE INVENTION In order to eliminate such inconvenience, therefore, the present invention sets a target supercharging pressure by the supercharger according to an operating state of an internal combustion engine equipped with the supercharger. In the supercharging pressure control device for controlling the supercharging pressure, when the supercharging pressure increasing execution condition is satisfied during the transient operation of the internal combustion engine, the supercharging pressure by the supercharger is higher than the target supercharging pressure. A control means is provided for controlling to increase to the supercharging pressure and for gradually decreasing the high side supercharging pressure to the target supercharging pressure when the supercharging pressure damping execution condition is satisfied. .

[0009]

According to the structure of the present invention, the control means causes
When the conditions for increasing the boost pressure are satisfied during transient operation of the internal combustion engine, the boost pressure by the supercharger is controlled to increase to a higher boost pressure higher than the target boost pressure. The pressure is controlled so as to be gradually attenuated to the target supercharging pressure when the supercharging pressure damping execution condition is satisfied, so that during the transient operation of the internal combustion engine, the high-side supercharging higher than the target supercharging pressure during the steady operation is performed. It can be controlled by pressure.

[0010]

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

1 to 9 show an embodiment of the present invention. In FIG. 1, 2 is an internal combustion engine, 4 is an intake passage, and 6 is an exhaust passage. The intake passage 4 has an air cleaner 8 at its upstream end and communicates at its downstream end with a combustion chamber (not shown) of the internal combustion engine 2. A throttle valve 10 is provided in the intake passage 4. A compressor 14 of the supercharger 12 is provided in the intake passage 4 upstream of the throttle valve 10. The supercharger 12 includes a turbine 16 having a compressor 14 provided in the intake passage 4 and a compressor 16 provided in the exhaust passage 6.
To drive the intake air under pressure.

The exhaust passage 6 is provided with a bypass passage 18 that bypasses the turbine 16 of the supercharger 12. A bypass valve 20 is provided in the bypass passage 18. The bypass valve 20 is opened and closed by a bypass valve actuator 22. The bypass valve actuator 22 is provided with a diaphragm 26 that divides the pressure chamber 24, connects the other end side of a rod 28 that connects one end side to the diaphragm 26 to the bypass valve 20, and closes the bypass valve 20. A spring 30 for urging the diaphragm 26 is provided. The pressure chamber 24 of the bypass valve actuator 22 communicates with one end side of the pressure guiding passage 32. Pressure passage 3
The other end side of 2 communicates with the intake passage 4 on the downstream side of the compressor 14. A pressure guiding control valve 34 for controlling the supercharging pressure acting on the pressure chamber 24 is provided in the middle of the pressure guiding passage 32.

In the internal combustion engine 2, a fuel injection valve 36 is provided in the intake passage 4 so as to face a combustion chamber (not shown). The fuel injection valve 36 communicates with a fuel tank 40 via a fuel passage 38. In the fuel tank 40, a fuel pump 42 that supplies fuel to the fuel passage 38 is provided. A fuel pressure adjusting valve 44 for adjusting the fuel pressure by the intake pressure of the intake passage 4 is provided in the middle of the fuel passage 38. The fuel pressure adjusting valve 44 adjusts the fuel pressure in the fuel passage 38 to a predetermined pressure, and returns excess fuel to the fuel tank 40 through the return passage 46.

The intake passage 4 is provided with an auxiliary air passage 48 that bypasses the throttle valve 10. The auxiliary air passage 48 has one end connected to the intake passage 4 upstream of the throttle valve 10 and downstream of the compressor 14 of the supercharger 12, and the other end of the auxiliary air passage 48 downstream of the throttle valve 10. It communicates with an intake passage 4 leading to a combustion chamber (not shown). The auxiliary air passage 48 is provided with an idle speed control valve 50 that is feedback-controlled so that the engine speed becomes a target speed during idle operation of the internal combustion engine 2.

The intake passage 4 is provided with a throttle opening sensor 52 for detecting the opening of the throttle valve 10, an intake temperature sensor 54 for detecting the intake temperature, and a pressure sensor 56 for detecting the intake pressure. There is. In the internal combustion engine 2,
A rotation angle sensor 58 and a water temperature sensor 60 are provided. The rotation angle sensor 58 is provided in the distributor 62. These various sensors 52 to 60 are connected to the input side of a control unit 64 which is a control unit that constitutes the boost pressure control device.

On the input side of the control unit 64, a select position switch 66 for inputting a signal selected by an automatic transmission (not shown) to the D range and a dignosis for inputting a diagnosis signal. A signal unit 68, an air conditioner switch 70 for inputting signals for driving and stopping an air conditioner (not shown), a speedometer 72 for inputting a vehicle speed signal, and an initial setting unit for inputting an initial setting signal. 74, a power steering switch 76 for inputting signals for driving and stopping a power steering device (not shown), a CO adjustment resistor 78 for inputting a CO adjustment signal, and a battery 80 are connected. ing.

A pressure guiding control valve 34, a fuel injection valve 36, a fuel pump 42, and an idle speed control valve 50 are connected to the output side of the control unit 64. The fuel pump 42 is connected via a pump relay 82.
Further, on the output side of the control unit 64, an idle up control valve 84 for the power steering device, which is on-controlled to idle-up the internal combustion engine 2 when the power steering device is driven, and an exhaust gas recirculation amount to the intake passage 4 are provided. E to control
GR control valve 86, ignition coil 88, and monitor 90
The turbo lamp 92 and the duty meter 94 are connected to each other.

The control unit 64 includes an A / D conversion unit 96 and a CPU.
98, output unit 100, shaping unit 102, and buffer unit 104
Consists of. The control unit 64 outputs an injection valve drive signal to the fuel injection valve 36 according to signals input from various sensors,
A pump drive signal is output to the fuel pump 42, an ignition command signal is output to the ignition coil 88, fuel is appropriately injected from the fuel injection valve 36, and an ignition plug (not shown) is appropriately fired. Further, during idle operation of the internal combustion engine 2, the control unit 64 feedback-controls the idle speed control valve 50 so that the engine speed becomes the target speed, and adjusts the amount of auxiliary air in the auxiliary air passage 48.

As shown in FIGS. 2 and 3, the control unit 44 is set with a target supercharging pressure TPMTC according to the engine speed Ne, which is the operating state of the internal combustion engine 2. Control unit 64
Controls the boost pressure acting on the bypass valve actuator 22 by operating the pressure control valve 34,
By opening and closing the bypass passage 18 to open and close, the supercharging pressure PM by the supercharger 12 is set to the target supercharging pressure TPMT.
Control to become C.

In such a supercharging pressure control device, the control unit 64 controls the supercharging pressure PM by the supercharger 12 when the supercharging pressure increasing execution condition is satisfied during the transient operation of the internal combustion engine 2.
Higher boost pressure TPMT higher than the target boost pressure TPMTC
C * KPMINC (supercharging pressure increase coefficient) is controlled to increase, and this high side supercharging pressure TPMTC * KPMIN
When the supercharging pressure damping execution condition is satisfied, C is controlled so as to be gradually damped to the target supercharging pressure TPMTC.

In the first embodiment, as shown in FIGS. 4 to 6, when the internal combustion engine 2 starts from a stopped state during transient operation, the vehicle speed is set to the set vehicle speed K as a supercharging pressure increasing execution condition.
It is set to SPDTC or less, the throttle valve 10 is fully opened, and the time TIME at which the vehicle speed is equal to or less than the set vehicle speed KSPDTC is maintained for the set time KTCDLY or more. Further, as the supercharging pressure damping execution condition, it is set that the vehicle speed exceeds the set vehicle speed KSPDTC. High side boost pressure TPMTC * KPMINC
Is damped by the boost pressure damping coefficient KTCED.

Next, the operation of the first embodiment will be described.

The internal combustion engine 2 is controlled by the control unit 64 so that intake air supercharged by the supercharger 12 is metered and supplied by the intake throttle valve 10, fuel is supplied by the fuel injection valve 36, and an ignition plug ( It is ignited and burned by (not shown). The fuel supply amount and the ignition timing are appropriately controlled by the control unit 64.

During steady operation of the internal combustion engine 2, the control unit 64
2 and 3 by operating the pressure control valve 34 to control the supercharging pressure acting on the bypass valve actuator 22 and driving the bypass valve 20 to open and close to open and close the bypass passage 18. As described above, the supercharging pressure PM by the supercharger 12 is controlled so as to become the target supercharging pressure TPMTC.

When the internal combustion engine 2 is in a transient operation and is started from a stopped state, the vehicle speed is set to the set vehicle speed KS as shown in FIG.
It is determined whether PDTC or less (200), and it is determined whether the throttle valve 10 is fully opened (202).

In the judgment (200-202), if the vehicle speed> the set vehicle speed KSPDTC, or the throttle valve 10 is less than full open, and therefore any one of them is NO, the routine returns.

In the judgment (200-202), if the vehicle speed ≦ the set vehicle speed KSPDTC and the throttle valve 10 is fully opened, therefore, in the case of YES in both cases, T
The measurement of the time TIME is started by the IME COUNTER (204), and it is determined whether the time TIME of the vehicle speed ≦ the set vehicle speed KSPDTC is held for the set time KTCDLY or more (206).

If TIME <set time KTCDLY is NO, the process returns. TIME ≧ setting time KTCDL
If Y is YES, the supercharging pressure increasing execution condition is satisfied. Therefore, as shown in FIG. 6, the target supercharging pressure TPMTC is multiplied by the supercharging pressure increasing coefficient KPMINC to set the supercharging pressure PM to P.
M = TPMTC * Control to increase to KPMIN (20
8) Do. As a result, the supercharging pressure PM by the supercharger 12
Is the higher boost pressure TPM higher than the target boost pressure TPMTC.
Increased to TC * KPMINC.

After the high-side boost pressure TPMTC * KPMINC is increased, it is determined whether or not the vehicle speed exceeds the set vehicle speed KSPTCC, and when the vehicle speed> KSPTCC, the boost pressure damping execution condition is satisfied. Is a high-side supercharging pressure TPMTC * KPMINC, and the supercharging pressure damping coefficient KTCED is subtracted by PM = PM-KTCED from the supercharging pressure PM to attenuate (210), and the supercharging pressure is set to PM = TPMTC. Control (212) is performed to gradually attenuate PM to the target supercharging pressure TPMTC. After that, normal supercharging pressure control is performed.

As described above, the control unit 64 determines that the vehicle speed is equal to or lower than the set vehicle speed KSPDTTC, that the throttle valve 10 is fully open, and that the vehicle speed is the same when the internal combustion engine 2 starts from a stopped state during transient operation. When the supercharging pressure increasing execution condition that the time TIME equal to or less than the set vehicle speed KSPDTC is held for the setting time KTCDLY or more is satisfied, the supercharging pressure PM by the supercharger 12 is set to the target supercharging pressure TPMT.
The high-side boost pressure TPMTC, which is higher than C, is controlled to increase to a higher-side boost pressure TPMTC * KPMINC.
* If KPMINC is set to the supercharging pressure damping execution condition that the vehicle speed exceeds the set vehicle speed KSPDTC,
The target boost pressure TPMTC is gradually reduced by subtracting the boost pressure damping coefficient KTCED from the current boost pressure PM.

As a result, during the transient operation of the internal combustion engine 2, as shown in FIG. 4, the supercharging pressure PM is higher than the target supercharging pressure TPMTC during the steady operation.
The MINC can be temporarily controlled. When the supercharging pressure increasing execution condition is not satisfied, the supercharging pressure shown by the broken line is obtained.

For this reason, the transient output can be achieved without inconvenience that the output becomes excessively large during steady operation, adversely affecting the durability of the internal combustion engine 2 and the supercharger 12, and disadvantageous in terms of fuel consumption. You can improve the output when driving,
The output required during transient operation can be satisfied.

As a result, in particular, in the internal combustion engine 2 provided with the automatic transmission, there is a disadvantage that the internal slip of the torque converter deteriorates the followability during transient operation such as starting and the traveling feeling is deteriorated. By eliminating such inconvenience, it is possible to improve the followability and the traveling feeling.

7 to 9 show the second embodiment.

In the second embodiment, when the internal combustion engine 2 is in a transient operation on a slope, the supercharging pressure increasing condition is that the vehicle speed is equal to or lower than the set vehicle speed KSPDT, and the throttle valve 10 is fully opened. 1 Rotational speed DELN indicating the difference between the engine speed before ignition and the current engine speed
It is set that E is equal to or less than the set rotational speed KTCNE. Further, as the supercharging pressure damping execution condition, the rotational speed DELNE indicating the difference is set rotational speed KTCNE + DELNEH
It is set that YS (revolution speed hysteresis) is exceeded.

Next, the operation of the second embodiment will be described.

During steady operation of the internal combustion engine 2, the control unit 64
2 and 3 by operating the pressure control valve 34 to control the supercharging pressure acting on the bypass valve actuator 22 and driving the bypass valve 20 to open and close to open and close the bypass passage 18. As described above, the supercharging pressure PM by the supercharger 12 is controlled so as to become the target supercharging pressure TPMTC.

When the engine 2 is climbing uphill, which is a transient operation, as shown in FIG. 8, it is judged whether the vehicle speed is equal to or lower than the set vehicle speed KSPDT (300), and whether the throttle valve 10 is fully opened. A determination (302) is made, and the rotation speed D indicating the difference between the engine speed before one ignition and the current engine speed.
It is determined (304) whether or not ELNE is equal to or lower than the set rotational speed KTCNE.

In the judgment (300-304), vehicle speed> set vehicle speed KSPDT, and the throttle valve 1
0 is less than full throttle, or shows a difference
NE> set speed KTCNE, and therefore, if any one of them is NO, the process returns.

In the judgment (300-304), the vehicle speed ≦ the set vehicle speed KSPDT, the throttle valve 10 is fully opened, and the rotational speed DELNE ≦ the set rotational speed KTCNE showing a difference, and therefore, in the case of YES in both cases. Is
Since the supercharging pressure increasing execution condition is satisfied, as shown in FIG.
By multiplying the target supercharging pressure TPMTC by the supercharging pressure increase coefficient KPMINC, the supercharging pressure PM is PM = TPMTC * KP
Control (306) to increase to MINC. As a result, the supercharging pressure PM generated by the supercharger 12 is equal to the target supercharging pressure TPM.
The boost pressure TPMTC * KPMINC, which is higher than TC, is increased.

After the high side supercharging pressure TPMTC * KPMINC is increased, the rotational speed DELNE showing the difference is set rotational speed KTCNE + DELNEHYS (rotational speed hysteresis).
It is judged whether or not it exceeds (308), and DELNE ≧
When the supercharging pressure damping execution condition is satisfied due to KTCNE + DELNEHYS, the high side supercharging pressure TPMT
The supercharging pressure damping coefficient KTCED is subtracted by PM = PM-KTCED from the supercharging pressure PM which is C * KPMINC to attenuate (310), and the supercharging pressure PM is set to the target supercharging pressure TPMTC so that PM = TPMTC. The control is performed (312) so as to gradually attenuate. After that, normal supercharging pressure control is performed.

As described above, the control unit 64 sets the vehicle speed to the set vehicle speed KSPDT when the internal combustion engine 2 is in the transient operation, that is, when climbing a slope.
Below, the throttle valve 10 is fully open,
1 When the supercharging pressure increasing execution condition that the rotational speed DELNE showing the difference between the engine rotational speed before ignition and the current engine rotational speed is equal to or less than the set rotational speed KTCNE is satisfied, The supercharging pressure PM is set to the target supercharging pressure TPMT
The high-side boost pressure TPMTC, which is higher than C, is controlled to increase to a higher-side boost pressure TPMTC * KPMINC.
* If the supercharging pressure damping execution condition is satisfied because the rotational speed DELNE that indicates the difference exceeds the set rotational speed KTCNE + DELNEHYS (rotational speed hysteresis), the current supercharging pressure PM is damped to the supercharging pressure PM. Coefficient KTCE
Control is performed by D to gradually attenuate the target supercharging pressure TPMTC.

As a result, during transient operation of the internal combustion engine 2, as shown in FIG. 7, the supercharging pressure PM is higher than the target supercharging pressure TPMTC during steady operation.
The MINC can be temporarily controlled. When the supercharging pressure increasing execution condition is not satisfied, the supercharging pressure shown by the broken line is obtained.

For this reason, the transient output can be achieved without inconvenience that the output is excessively increased during the steady operation, and that the durability of the internal combustion engine 2 and the supercharger 12 is adversely affected and the fuel consumption is disadvantageous. You can improve the output when driving,
The output required during transient operation can be satisfied.

As a result, in particular, in the internal combustion engine 2 equipped with an automatic transmission, the internal slip of the torque converter causes a problem that the followability during transient operation such as climbing is deteriorated and the traveling feeling is deteriorated. It is possible to eliminate such inconvenience, improve the following ability, and improve the traveling feeling.

[0046]

As described above, according to the present invention, during transient operation of the internal combustion engine, the supercharging pressure can be temporarily controlled to a higher supercharging pressure higher than the target supercharging pressure during steady operation. it can.

For this reason, the transient operation is prevented without causing an inconvenient increase in the output during the steady operation, adversely affecting the durability of the internal combustion engine or the supercharger, and causing a disadvantage in fuel economy. Output can be improved to satisfy the output required during transient operation. As a result, in particular, in an internal combustion engine equipped with an automatic transmission, there is a disadvantage that the internal slip of the torque converter deteriorates the followability during transient operation such as starting and the traveling feeling is deteriorated. The inconvenience can be eliminated, the followability can be improved, and the traveling feeling can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a boost pressure control device showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between an engine speed and a target supercharging pressure.

FIG. 3 is a diagram showing a target supercharging pressure depending on an engine speed.

FIG. 4 is a timing chart of vehicle speed and supercharging pressure at the time of starting according to the first embodiment of the present invention.

FIG. 5 is a flowchart of determination of supercharging pressure increasing execution conditions according to the first embodiment of the present invention.

FIG. 6 is a flowchart of determination of supercharging pressure damping execution condition according to the first embodiment of the present invention.

FIG. 7 is a timing chart of vehicle speed, engine speed, and boost pressure when climbing a slope according to the second embodiment of the present invention.

FIG. 8 is a flow chart for determining a supercharging pressure increasing execution condition according to a second embodiment of the present invention.

FIG. 9 is a flowchart of determination of a boost pressure damping execution condition according to the second embodiment of the present invention.

[Explanation of symbols]

 2 internal combustion engine 4 intake passage 6 exhaust passage 10 throttle valve 12 supercharger 14 compressor 16 turbine 18 bypass passage 20 bypass valve 22 bypass valve actuator 32 pressure passage 34 pressure control valve 36 fuel injection valve 52 throttle opening sensor 72 speed Meter

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[Procedure amendment]

[Submission date] January 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

Claims (1)

[Claims] 1. A supercharging pressure control device for controlling a supercharging pressure by the supercharger to a target supercharging pressure according to an operating state of an internal combustion engine equipped with the supercharger. When the condition for increasing the boost pressure is satisfied, the boost pressure by the supercharger is controlled to be increased to a higher boost pressure higher than the target boost pressure, and the boost pressure is attenuated. A supercharging pressure control device comprising control means for controlling to gradually attenuate to the target supercharging pressure when an execution condition is satisfied.