JPH07166917A - Acceleration time controller for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent over-rich situation at the time of thermal obstruction by providing a temperature detection part for detecting atmospheric temperature, by calculating an increase level correction value in compliance with the detected value of the atmospheric temperature when the variation quantity in the pressure of an intake pipe exceeds a predetermined value, and by changing fuel injection quantity based on the correction value. CONSTITUTION:An idle rotation speed control valve 32 is normally feedback-controlled by a control part 44 based on the deviation in engine rotation speed during idle driving of an internal combustion engine 2, so as to adjust the amount of air flowing in a bypass passage 30. When it is judged that the variation quantity in intake boost exceeds a predetermined value, an increase quantity correction value K is calculated based on the intake temperature by means of an intake temperature sensor 36 as a detection means of the atmospheric temperature of the engine 2, and a new increase quantity DELTAPM.K is calculated by changing the increase quantity DELTAPM in compliance with the variation quantity of the boost by means of the increase quantity correction value, and fuel is increased and injected. An over-rich state at the time of thermal obstruction and an over-lean state at the time of low temperature are thereby prevented, and occurrence of engine stalling or the like is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acceleration control device for an internal combustion engine, and more particularly to an injector according to the amount of change in intake pipe pressure when the amount of change in intake pipe pressure exceeds a predetermined value during acceleration of the internal combustion engine. The present invention relates to a control device for accelerating an internal combustion engine, which increases the fuel injection amount.

[0002]

2. Description of the Related Art Some internal combustion engines are equipped with a fuel injection control device for setting a basic injection amount of fuel injected from an injector based on the engine speed and intake pipe pressure. This fuel injection control device sets a correction coefficient based on a signal from the intake air temperature sensor, and electronically corrects and controls the fuel injection amount of the injector by this correction coefficient.

Further, in the acceleration control device for an internal combustion engine, when the internal combustion engine is in an accelerating state, acceleration is performed by increasing the fuel injection amount of the injector according to the amount of change in boost, which is the intake pipe pressure. There is one that keeps the air-fuel ratio at a proper time. However, when the boost change amount is less than or equal to a predetermined value, the increase correction is not performed.

More specifically, as shown in FIG. 6, when the program of the control device for acceleration of the internal combustion engine is started (200), the amount of change in boost is a predetermined value, for example, 80 mmHg /
It is judged whether the value exceeds mS (202).

If the determination (202) is NO, acceleration correction is not performed (204), and the determination (202) is performed.
If YES, the fuel is injected by increasing the fuel injection amount ΔPM according to the boost change amount (206).

[0006]

By the way, in the conventional acceleration control system for an internal combustion engine, a correction amount as a fuel injection amount to be increased is determined only in accordance with a boost change amount.

However, even if the boost change amount is the same, if the base air-fuel ratio (A / F) is different, the required correction amount is also different. Especially in the case of heat damage,
When the intake air temperature rises and the base air-fuel ratio (A / F) is shifting to the rich side, the same amount of change in boost during acceleration is used, and the same correction as during non-heat damage is performed. If this happens, as shown in FIG. 5, the air-fuel ratio (A / F) becomes overrich, which may cause engine stop or engine stall, which is disadvantageous in practical use.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention sets the basic injection amount from the injector by the engine speed of the internal combustion engine and the intake pipe pressure, and at the time of accelerating the internal combustion engine. In a control device for an internal combustion engine that increases the fuel injection amount of an injector according to the amount of change in the intake pipe pressure when the amount of change in the intake pipe pressure exceeds a predetermined value, a temperature detector that detects the ambient temperature of the internal combustion engine. When an amount of change in intake pipe pressure exceeds a predetermined value, an increase amount correction value is calculated according to a signal from the temperature detecting unit, and the fuel injection amount of the injector is changed by this increase amount correction value. It is characterized in that control means for controlling so as to perform is provided.

[0009]

According to the invention as described above, when the change amount of the intake pipe pressure exceeds the predetermined value, the control means calculates the increase correction value according to the signal from the special temperature detecting section and The fuel injection amount of the injector is controlled to be changed by the increase amount correction value.

[0010]

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

1 to 4 show an embodiment of the present invention. In FIG. 3, 2 is an internal combustion engine, 4 is an intake passage,
6 is an exhaust passage.

The intake passage 4 is provided with 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. An intake 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 intake throttle valve 10. The supercharger 12 drives the compressor 14 provided in the intake passage 4 by a turbine 16 provided in the exhaust passage 6 to pump the intake air.

The internal combustion engine 2 is provided with an injector 18 in the intake passage 4 so as to face a combustion chamber (not shown). The injector 18 is connected to a fuel tank 22 by a fuel passage 20. In the fuel tank 22,
A fuel pump 24 that supplies fuel to the fuel passage 20 is provided. In addition, in the middle of the fuel passage 20, the intake passage 4
An adjusting valve 26 for adjusting the fuel pressure by the intake pressure is provided. The adjusting valve 26 adjusts the fuel pressure in the fuel passage 20 to a predetermined pressure, and removes excess fuel from the return passage 28.
To return to the fuel tank 22.

Further, in the intake passage 4, the intake throttle valve 1
A bypass passage 30 that bypasses 0 is provided. The bypass passage 30 has one end connected to the intake passage 4 upstream of the intake throttle valve 10 and downstream of the compressor 14 of the supercharger 12, and the other end of the bypass passage 30.
The intake passage 4 is connected to a combustion chamber (not shown) downstream of the intake passage 4. An idle speed control valve (VSV) 32 for idle speed control (ISC), which is feedback-controlled so that the engine speed becomes a predetermined engine speed during idling operation of the internal combustion engine 2, is provided in the bypass passage 30. There is.

In the intake passage 4, a throttle sensor 34 that detects the throttle opening of the intake throttle valve 10 and functions as an idling detection unit, and an intake temperature sensor 36 that detects intake temperature and functions as a heat damage detection unit. And a pressure sensor 38 for detecting the intake pressure. Further, the internal combustion engine 2 is provided with a rotation angle sensor 40 and a water temperature sensor 42 that detects the cooling water temperature and functions as a heat damage detection unit. These various sensors 34 to 42 are connected to the input side of a control unit 44 which is a control means.

On the input side of the control unit 44, a diagnosis, an air conditioner for air conditioning (A / C, not shown), a speedometer for inputting a vehicle speed signal, an initial set, and an O ₂ sensor not shown. , A CO adjustment resistor (not shown), a battery 46, and an air conditioner (A / C) compressor (not shown) are connected to each other.

Further, the injector 18, the fuel pump 24, and the idle speed control valve 32 are connected to the output side of the control section 44, respectively. The fuel pump 24 is connected via a pump relay 48.
Further, the output side of the control unit 44 is connected to the internal combustion engine 2 when the power steering device, which is an external load of the internal combustion engine 2, is driven.
A power steering device idle-up control valve (ABV VSV) 50 as an external load idle-up control valve that is on-controlled to idle-up the engine is connected, and an EGR that controls the amount of exhaust gas recirculation to the intake passage 4 is connected. A control valve (EGR VSV) 52, an ignition coil 54, a monitor (not shown), a turbo lamp (not shown), and a duty meter (not shown) are connected to each other.

As a result, the control section 44 outputs an injection valve drive signal to the injector 18 in response to signals input from various sensors, a pump drive signal to the fuel pump 24, and an ignition command signal to the ignition coil 54. Is output to cause the injector 18 to appropriately inject fuel corresponding to the basic injection amount, and to appropriately fire an ignition plug (not shown).

Further, the control unit 44, when the amount of change in boost as the intake pipe pressure exceeds a predetermined value, a temperature detection unit,
For example, it has a configuration in which an increase amount correction value K is calculated according to a signal from the intake air temperature sensor 36, and the fuel injection amount of the injector 18 is controlled by the increase amount correction value K.

More specifically, when the boost change amount exceeds a predetermined value, for example, 80 mmHg / mS, the control unit 44 calculates an increase amount correction value K from a signal from the intake air temperature sensor 36, and thereafter, Further, the increase amount ΔPM according to the change amount of the boost is changed by the increase amount correction value K to calculate a new increase amount ΔPM · K, and the fuel is injected by this increase amount ΔPM · K.

The increase amount correction value K is as shown in FIG.
The signal changes from the signal from the intake air temperature sensor 36, that is, the intake air temperature.

Next, the operation will be described.

The internal combustion engine 2 is supplied with the intake air supercharged by the supercharger 12 being metered by the intake throttle valve 10.
Fuel is supplied by the injector 18 and is ignited and burned by a spark plug (not shown). The control unit 44 appropriately controls the fuel supply amount and the ignition timing.

Further, during idling operation of the internal combustion engine 2, the control section 44 feedback-controls the idle speed control valve 32 so that the engine speed becomes a predetermined engine speed and adjusts the amount of air flowing through the bypass passage 30. The idle speed is stabilized.

Next, description will be made with reference to the flowchart of FIG.

When the program in the control unit 44 starts (100), it is judged (102) whether or not the amount of change in boost, which is the intake pipe pressure, exceeds 80 mmHg / mS.

If the judgment (102) is NO, acceleration correction is not performed (104), and if the judgment (102) is YES, the increase correction value K is calculated from the intake air temperature (10).
6) After that, the increase amount ΔP according to the change amount of the boost
By changing M by the increase amount correction value K, a new increase amount Δ
PM · K is calculated, and fuel is injected by this increased amount ΔPM · K (108).

As a result, as shown in FIG. 4, overrich at the time of heat damage can be prevented, over lean at the time of low temperature can be prevented, and engine stop and engine stall at the time of heat damage or low temperature can be reliably prevented. It is possible and practically advantageous.

Further, the increase correction value is calculated according to the intake air temperature, and the injector 18 is calculated based on the increase correction value.
By controlling the fuel injection amount to be changed, the control program can be easily changed, the cost can be kept low, and it is economically advantageous.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, the intake air temperature sensor is provided as the temperature detecting portion and the increase correction value K is calculated according to the signal from the intake air temperature sensor. It is also possible to use a water temperature sensor or another sensor capable of detecting the ambient temperature of the internal combustion engine and calculate the increase correction value K according to the signal from this sensor.

[0032]

As described in detail above, according to the present invention, the basic injection amount from the injector is set by the engine speed of the internal combustion engine and the intake pipe pressure, and the change amount of the intake pipe pressure during acceleration of the internal combustion engine is set. In a control device for an internal combustion engine that increases the fuel injection amount of the injector in accordance with the amount of change in the intake pipe pressure when exceeds a predetermined value, a temperature detection unit that detects the ambient temperature of the internal combustion engine is provided. Is provided with a control means for calculating an increase amount correction value according to a signal from the temperature detection unit and controlling the fuel injection amount of the injector to be changed by the increase amount correction value when the change amount exceeds a predetermined value. As a result, it is possible to prevent overrich at the time of heat damage, and also to prevent over lean at low temperature, and to prevent engine stop and engine stall at heat damage and low temperature. And obtained by indeed prevented, which is advantageous in practical use. Further, by calculating the increase correction value according to the intake air temperature and controlling the fuel injection amount of the injector to be changed by the increase correction value, the control program can be changed easily and the cost can be kept low. In addition, it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a control flowchart of an acceleration control device for an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between an intake air temperature and an increase correction value K.

FIG. 3 is a schematic configuration diagram of a control device for an internal combustion engine.

FIG. 4 is a diagram showing a relationship between an air-fuel ratio (A / F) and a traveling state.

FIG. 5 shows an air-fuel ratio (A / F) showing a conventional technique of the present invention.
It is a figure which shows the relationship between a running state and.

FIG. 6 is a control flowchart of an acceleration control device for an internal combustion engine.

[Explanation of symbols]

 2 Internal combustion engine 4 Intake passage 6 Exhaust passage 8 Air cleaner 10 Intake throttle valve 12 Supercharger 18 Injector 20 Fuel passage 22 Fuel tank 32 Idle speed control valve (VSV) 34 Throttle sensor 36 Intake temperature sensor 38 Pressure sensor 40 Rotation angle sensor 42 water temperature sensor 44 control unit 48 pump relay 50 idle up control valve (ABV VSV) 52 EGR control valve (EGR VSV)

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[Procedure amendment]

[Submission date] February 2, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 1]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Claims] 1. A basic injection amount from an injector is set based on an engine speed of an internal combustion engine and an intake pipe pressure, and the intake pipe pressure is controlled when the change amount of the intake pipe pressure exceeds a predetermined value during acceleration of the internal combustion engine. In the control device for the internal combustion engine, which increases the fuel injection amount of the injector according to the change amount,
A temperature detection unit for detecting the ambient temperature of the internal combustion engine is provided, and when the amount of change in the intake pipe pressure exceeds a predetermined value, an increase amount correction value is calculated according to the signal from the temperature detection unit, and the increase amount is increased. An acceleration control device for an internal combustion engine, comprising control means for controlling to change the fuel injection amount of the injector according to a correction value.