JPS6325347A - Throttle valve control device for internal combustion engine loaded on car - Google Patents

Abstract

PURPOSE:To improve acceleration in a full opening region, by a method wherein, when an accel working position exceeds a given value, control on a target throttle opening, by mean of which a minimum fuel consumption factor is obtained according to the number of revolutions, is stopped, and throttle vavle opening control is made only on an accel working position. CONSTITUTION:A control circuit 17 controls the opening of a throttle valve 12 with the aid of a pulse motor 15 based on detecting values from an accel working position sensor 7, a throttle valve opening sensor 14, a crank angle sensor 18, a sensor 19 for an absolute pressure in an intake air pipe and the like. The control circuit 17 reads a target throttle valve opening, by means of which a minimum fuel consumption factor is obtained responding to the number of revolutions, from a data map to perform feedback control. When an accel working position exceeds a given value and an actual throttle valve opening is below a target value, a throttle valve opening responding to the accel working position is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a throttle valve control device for controlling the opening degree of a throttle valve of an on-vehicle internal combustion engine.

As a conventional throttle valve control device, for example, JP-A-60-1
As disclosed in Japanese Patent No. 192843, there is a device which determines the opening degree of a throttle valve according to the operating position of the accelerator and the rotational speed of the accelerator and drives the throttle valve to that opening degree in order to improve drivability. on the other hand,
In order to improve engine fuel efficiency, it has been considered to control the opening degree of the throttle valve. The applicant has proposed driving a throttle valve so as to reduce the deviation between the intake pipe pressure and the target intake pipe pressure. However, if the actual intake pipe pressure is controlled to be equal to the target intake pipe pressure, the throttle valve cannot be fully opened even if the accelerator pedal is fully depressed, making it difficult to ensure good acceleration with the engine's maximum output. Since this becomes impossible, it is desirable to take this countermeasure.

Therefore, an object of the present invention is to provide a throttle valve control device for an internal combustion engine that can improve fuel efficiency while ensuring engine acceleration.

The throttle valve control device of the present invention adjusts the throttle valve to the target intake pipe pressure if the actual throttle valve opening is smaller than the target throttle valve opening when the detected accelerator actuation position is larger than a predetermined position. It is characterized in that the drive is stopped and the throttle valve is driven only in accordance with the detected accelerator actuation position.

Support-upper-1 Embodiments of the present invention will be described below with reference to the drawings.

In the throttle valve control device for an on-vehicle internal combustion engine, which is an embodiment of the present invention shown in FIG. It is rotatable. A return spring 4 is provided at the other end of the bracket 2, and urges the Acvil pedal 1 toward the idle position. The shaft 3 is provided with an accelerator operating position sensor 7 consisting of a potentiometer, and the accelerator operating position sensor 7 outputs an output according to the operating position of the accelerator pedal 1, that is, the accelerator angle, which is the turning angle from the idle position around the shaft 3. Generates voltage.

On the other hand, the shaft 1 of the throttle valve 12 in the engine intake pipe 11
2a is provided with a throttle valve opening sensor 14 which is also a potentiometer, and the throttle valve opening sensor 14 is connected to the throttle valve 1.
Generates an output voltage according to the opening degree of 2. Also shaft 1
A rotating shaft of a pulse motor 15 is coupled to 2a.

The accelerator operation position sensor 7 , throttle valve opening sensor 14 , and pulse motor 15 are connected to a control circuit 17 . The control circuit 17 further includes the crankshaft of the engine 16 (
A crank angle sensor 18 generates a pulse at a specific crank angle according to the rotation of the engine (not shown), an absolute pressure sensor 19 generates an output according to the absolute pressure in the intake pipe 11, and fuel is injected and supplied to the engine 16. An injector 20 for this purpose is connected.

As shown in FIG. 2, the control circuit 17 includes a level conversion circuit 21 that converts the output levels of the accelerator operation position sensor 7, throttle valve opening sensor 14, and absolute pressure sensor 19, and each voltage signal that has passed through the level conversion circuit 21. The output T of the multiplexer 22 and the multiplexer 22 selectively output one of the
An A/DpL converter 23 that converts the illumination ball to Δ/D, a waveform shaping circuit 24 that shapes the output signal of the crank angle sensor 18, and a clock that clocks the generation interval of the TDC signal output as a pulse from the waveform shaping circuit 24. A counter 25 that measures the number of clock pulses output from a pulse generation circuit (not shown), a drive circuit 26a that drives the pulse motor 15, and a drive circuit 26 that drives the injector 20.
b, and cp, which performs digital operations according to the program.
27, a ROM 28 in which programs and data are written in advance, and a ΔM29.

Multiplexer 22, A/D converter 23, counter 25
, drive circuits 26a, 26b, CPU 27, ROM 28,
and RAM 29 are connected to each other by a bus 30. Note that the CPU 27 is supplied with clock pulses from a clock pulse generation circuit (not shown). Moving part CPU
27 constitutes first and second setting means, and the CPU 27 and drive circuit 26a constitute drive means.

In such a configuration, the A/D converter 23 outputs the accelerator angle θACC1 throttle valve opening θ[h and the intake pipe absolute pressure P
Alternatively to each piece of information on EA, information on the engine rotation speed Ne is supplied from the counter 25 to the CPU 27 via the bus 30. The CPU 27 reads the ROM in synchronization with the clock pulse.
The above information is read according to the calculation program stored in 28, and the pulse motor 1 is
A pulse motor valve open drive command and a pulse motor valve close drive command for driving the pulse motor 15, or a pulse motor drive stop command for stopping the drive of the pulse motor 15 are sent to the drive circuit 2.
Occurs for 6a.

Next, the operation of the throttle valve control device according to the present invention will be explained with reference to the operation flow diagram of the CPU 27 shown in FIG.

The CPU 27 calculates the engine rotation speed Ne every predetermined cycle.

The intake pipe absolute pressure Pa A, the throttle valve opening θth, and the accelerator angle θACC are read (step 51), and the target intake pipe absolute pressure P is determined according to the read engine speed Ne.
Step 52) to search for aAref, and the target throttle valve opening θthr according to the read accelerator angle θACC.
Search for er (Swi ° Tube 53). The ROM 28 stores the target intake pipe absolute pressure PsAre that provides the minimum fuel consumption rate according to the engine speed Ne with the characteristics shown in Fig. 4.
f is stored in advance as a PaAref data map, and the target throttle valve opening θthrer corresponding to the accelerator angle θACC with the characteristics shown in FIG. 5 is stored in advance as a θthrer data map.
The target intake pipe absolute pressure PeArer according to PeAre
Accelerator angle θA read again from the t data map
θthre is the target throttle valve opening θthrer according to CC.
Search each from the r data map. Next, it is determined whether the read accelerator angle θACC is greater than 60° (step 54). If θAcc≦60'', the accelerator is not in the fully open region, so the flag FWOT is set equal to 0 to control the target intake pipe absolute pressure (step 55), and the intake pipe absolute pressure read as the target intake pipe absolute pressure PaAref is set. Calculate the deviation ΔPBA from the pressure PA8A (Step 56), and calculate the opening correction amount Δθth of the throttle valve 12 according to the deviation ΔPBA in the ROM 28 with the characteristics shown in FIG.
Search from the Δθth data map stored in advance (
Step 57). The read throttle valve opening θth is added to the searched opening correction amount Δθth to obtain the control opening θout.
is calculated (step 58). On the other hand, θACC>60°
In this case, the flag FWOT is set because the accelerator is fully open.
is equal to 1 (step 59), FW
If OT-0, the actual throttle valve opening θth read assuming that the target intake pipe absolute pressure control was not the throttle valve full open control when this routine was executed last time is the target throttle valve opening θt.
Determine whether it is smaller than href (step 60
). If θth≧θthrer, step 56 is executed to control the target intake pipe absolute pressure. θt'h
If <θthref, the flag FWOT is set equal to 1 to perform throttle valve full-open control (step 61), and the control opening θthrer is set equal to the target throttle valve opening θthref (step 62).

In step 59, if FWOT=1, it is determined whether or not the intake pipe absolute pressure (intake pipe absolute) fPsA is greater than the target intake pipe absolute pressure PeAref (assuming that the throttle valves were fully open i, IJ III when this routine was executed last time). Step 63) If Ps A > P8A rer, the engine is in a high load state, so step 62 is executed to make the valve opening equal to θthref. PEA≦PaAre
If f, the load is not high, so it is better to stop the throttle valve full-open control and return to the target intake pipe absolute pressure control. Therefore, by executing steps 55 and below, the flag FWOT is made equal to O, and the control is opened according to the deviation ΔPea. Calculate the degree θout.

When the control opening degree θout is set in step 58 or 62, the read throttle valve opening degree θth becomes the control opening degree θout.
It is determined whether it is equal to t (step 64). θth
If -θout, a pulse motor drive stop command is issued to the drive circuit 26a (step 65). θth≠
If θout, the throttle valve opening θth is the control opening θout
It is determined whether the value is greater than (step 66). θt
If h>θout, a pulse motor valve closing drive command is generated to the drive circuit 26a to drive the throttle valve in the valve closing direction (step 67), and if θth>θout, that is, 8th<θout, A pulse motor valve opening drive command is generated to the drive circuit 26a to drive the throttle valve in the opening direction (step 68).

The drive circuit 26 drives the throttle valve 12 in the opening direction by rotating the pulse motor 15 in the forward direction in response to the pulse motor valve-closing drive command, and rotates the pulse motor 15 in the reverse direction in response to the pulse motor valve-closing drive command. This drives the throttle valve 12 in the valve closing direction.

In addition, in response to the pulse motor drive stop command, pulse motor 1
5 is stopped and the throttle valve opening degree at that time is maintained. By doing this, the throttle valve opening θth is controlled to the opening θ
It follows out.

In the throttle valve control device according to the present invention, in the fully open region of the accelerator, the accelerator angle θA has the characteristics shown in FIG.
Since the control opening degree θOu° C. of the throttle valve is determined with respect to ce, the engine output can be smoothly increased even from a low engine speed.

In the embodiment of the present invention described above, Δθth is determined for the opening degree correction using the Δθth data map, but a predetermined calculation formula, for example, Δθth=kl・ΔP8
It may be calculated by A (kl is a constant).

Furthermore, in the embodiment of the present invention described above, the CPU 27
The drive circuit 26a generates pulses to the pulse motor 15 at a predetermined speed in response to a pulse motor valve opening drive command or valve closing drive command from The CPU 27 generates a pulse motor valve opening drive command or valve closing drive command representing the number of pulses corresponding to the difference from the degree θout to the drive circuit 26a, and the drive circuit 26a sends drive pulses to the pulse motor 15 by the number of pulses. It may also be supplied.

1.1 As described above, in the throttle valve control device for an on-vehicle internal combustion engine of the present invention, when the accelerator operating position is in the fully open region of the accelerator, which is larger than the predetermined position, the actual throttle valve opening becomes the target throttle valve opening. If it is smaller than g, the drive of the throttle valve to the target intake pipe internal pressure is stopped and the throttle valve is driven only according to the accelerator operating position, so acceleration in the fully open region of the accelerator can be ensured, and There are tools that can improve fuel efficiency outside of this range.

Further, the throttle valve control device of the present invention is suitable for use in conjunction with a CVT (automatic transmission) device or the like that controls the engine speed according to the accelerator operating position.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a specific configuration of a control circuit in the device shown in FIG. 1, FIG. 3 is a flow diagram showing the operation of the CPU, and FIG. 4 to 6 are diagrams showing the characteristics of data maps stored in advance in the ROM. Explanation of symbols of main parts 1...Accelerator pedal 7...Accelerator operation position sensor 11...
・Intake pipe 12... Throttle valve 14... Throttle valve opening sensor 15... Pulse motor 17... Control circuit

Claims (1)

[Claims] A throttle valve control device that controls the opening degree of a throttle valve disposed in an intake system of an on-vehicle internal combustion engine, the device comprising an accelerator operation detection means that generates an output according to the actuation position of an accelerator pedal, and an engine rotation speed detection means. , pressure detection means for detecting the pressure in the intake pipe downstream of the throttle valve, throttle valve opening detection means for detecting the opening of the first throttle valve, and engine rotation speed detected by the first engine rotation speed detection means. The first step is to set the target throttle valve opening at which the minimum fuel consumption rate can be obtained.
a setting means, a second setting means for setting a target throttle valve opening corresponding to the actuation position of the accelerator pedal detected by the earlier accelerator operation detection means, and an actual intake pipe pressure detected by the earlier pressure detection means and the setting. driving means for driving the throttle valve so as to reduce a deviation from the target intake pipe internal pressure, and the driving means controls the throttle valve detecting means when the detected accelerator actuation position is greater than a predetermined position. If the actual throttle valve opening detected by A throttle valve control device characterized by driving a valve.