JPH02169829A - Throttle valve control device - Google Patents

Abstract

PURPOSE:To simultaneously satisfy quick response characteristic and characteristic of accurately following up to a target throttle opening during the transient period of a throttle valve by changing the resolution of the rotary angle of the throttle valve from the time of steady-state driving to the time of transient driving. CONSTITUTION:An electronic control device 30 performs the drive control of a stepping motor 5 and adjusts the opening of a throttle valve 3 based on the operating conditions outputted from a vehicle speed sensor 41, accelerator sensor 43, and others. In this control, it is judged based on the operating conditions if the condition is transient in which high speed action of the throttle valve 3 is required or not. When the condition is judged to be transient, opening of the throttle valve 3 per one step of the stepping motor 5 is controlled to be wider than the case in which the condition is not judged to be transient. Thus, the response characteristic can be made to consist with the control characteristic of following up to a target value of the throttle opening by changing the rotary angle resolution of the throttle valve 3 between steady-state and transient conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device that adjusts the intake air amount of an internal combustion engine using a throttle valve driven by a stepping motor.

[Prior Art and its Problems] Conventionally, this type of throttle valve control device is known, for example, as disclosed in Japanese Patent Publication No. 51-138235.

In this system, a throttle valve is driven by a stepping motor, and its control method is to drive the stepping motor to rotate at a constant resolution in order to follow a target throttle distance.

By the way, in this type of throttle valve control device, in order to make the throttle valve quickly follow the target throttle angle, it is necessary to make the rotational angle resolution of the stepping motor coarser to some extent. It becomes difficult to match the speed accurately, and conversely, to accurately follow the target throttle speed,
It is necessary to make the resolution finer, but doing so means sacrificing speed.

Therefore, in the above-mentioned conventional technology, since the stepping motor is driven only with a fixed resolution, it has one of the above-mentioned advantages, that is, high speed and accurate tracking of the target throttle distance. The problem is that we have to sacrifice.

As a means to solve these problems,
As described in Japanese Patent No. 085 and Publication No. 60-212641, there are systems that change the throttle opening/closing speed depending on the deviation between the target throttle distance and the current throttle distance.

In this technique, the opening/closing speed is changed by changing the driving pulse rate of the stepping motor. However, there is an upper limit to the drive pulse rate, and if it is increased too much, the stepping motor will step out.

In addition, as another conventional technique, Utility Model Application No. 60-82538
As described in the above publication, there is also known a system that switches from a 1-2 phase excitation system to a 2-phase excitation system when idling and when the accelerator is operated. However, in this technique, since the 1-2 phase excitation is limited to the idle time, there is a problem that the accuracy is insufficient with only the 2-phase excitation when controlling such as auto drive during steady running.

The present invention aims to solve the above-mentioned problems of the conventional technology, and by changing the rotational angle resolution of the throttle valve between steady state and transient state, the responsiveness and followability of the throttle distance control to the target value can be improved. It is an object of the present invention to provide a throttle valve control device that achieves both of the following.

[Means for Solving the Problems] The present invention, which has been made to solve the above problems, as shown in FIG. M3 and this throttle valve M
3, a stepping motor M4 that adjusts the speed of the internal combustion engine M1, and an operating state detection means M that detects the operating state of the internal combustion engine M1.
5; a control means M6 for controlling the stepping motor M4 based on the operating state from the operating state detecting means M5; a transient state determining means M7 for determining whether or not an operation is required in a transient state; and a transient state determining means M7 provided in the control means M6;
1 of the stepping motor M4 compared to when it is not determined to be a transient state.
The present invention is characterized in that it includes resolution changing means M8 for increasing the distance between the throttle valves M3 per stem.

[Function] According to the configuration of the present invention, the control means M6 controls the driving of the stepping motor M4 based on the operating state output from the operating state detecting means M5, and sets the speed of the throttle valve M3 to UPJ. In this control, the operating state from the operating state detecting means is also manually inputted to the transient state determining means M7, and based on the operating state, the above-mentioned throttle valve M3
It is determined whether the transient state requires high-speed operation.

When it is determined that the transient state is present based on the determination result of the transient state determining means M7, the resolution changing means M8 provided in the control means M6 causes the stepping motor to Control is performed to increase the distance between throttle valve M3 per step of M4.

In other words, in the case of a transient state, it is determined that a high speed of the throttle valve 3 is required, and the resolution of the valve distance per step is coarsened, and in other cases, the resolution of the rotation per step is Angular resolution is finely controlled.

[Example code] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing a throttle valve provided in an intake pipe of an engine and peripheral devices that open and close the throttle valve. As shown in the figure, a throttle valve 3 is provided on the upstream side of the surge tank in the intake pipe 1 of the engine, and this throttle valve 3 is driven to open and close by a stepping motor 5, which will be described later. is detected by the throttle position sensor 7.

As shown in FIG.
It is a phase motor, fixed to an output shaft 11, and equipped with a rotor 15 having a large number of small teeth 13 on the outer periphery, and eight large teeth 19 around which a winding 17 is wound on the inner periphery. The stator 23 has each large tooth 19 and four small teeth 21.

This stepping motor 5 is connected to an electronic control device 30 which will be described later.
It is driven by the control of 1.
- It is performed by selecting two-phase excitation and two-phase excitation.

That is, the driving state of the stepping motor 5 by the 1-2 phase dynamic magnetism is determined by each driving pulse signal IP to 11[) in FIG.
The rotor is shown moving 150 steps under human power.

Now, the first drive pulse signal IP is applied to the stepping motor 5.
is manually applied, the first phase IS of the stepping motor 5
is excited. As a result, the rotor 15 advances by 178 tooth pitches from the position before the first drive pulse signal IP. Subsequently, when the second drive pulse signal 2P is manually applied, the first phase 1S and the second phase 2S are excited, and the small teeth 1 of the rotor 15 are excited.
The sidewalk position No. 3 is stepped by 1/8 tooth pitch from the position after the manual input of the first drive pulse signal 1P.

Furthermore, when the third drive pulse signal 3P is manually applied, the first
The phase IS is de-energized and the second phase 2S becomes excited, and the rotor 15 further advances by 1/8 tooth pinch. Subsequently, when the fourth drive pulse signal 4P is manually applied, the second phase 2S and the third phase 3S are excited, and the rotor 15 moves by a 1/8 tooth pitch. When each drive pulse signal IP to 4P is manually applied to the stepping motor 5 in this way,
The rotor 15 advances in steps of 178 teeth.

On the other hand, the driving state of the stepping motor 5 by two-phase excitation is shown by the stepping state of the rotor 15 under human power with each drive pulse signal IP to 3P in FIG. When the first drive pulse signal IP is manually applied to the stepping motor 5, the first phase IS and the second phase 2S are excited, and the rotor 15 moves 1/1 tooth pitch step from the position before the first drive pulse signal IP. proceed. Subsequently, when the second drive pulse signal 2P is manually applied, the second phase 2S and the third phase 3S are excited and the rotor 1
The position of the small tooth No. 5 is advanced by 1/4 tooth pitch from the position after manual input of the first drive pulse signal IP. Furthermore, when the third drive pulse signal 3P is manually applied, the third phase 3S and the fourth phase 4S
is excited, and the rotor 15 position further advances by 1/4 tooth pitch. When each of the drive pulse signals IP to 3P is manually applied to the stepping motor 5 in this way, the rotor 15 is 1/4
Step forward step by step.

Therefore, in 1-2 phase excitation control, the drive pulse signal is stepped by 1/8 tooth every time the drive pulse signal is manually applied, and driving is performed with fine rotation angle resolution, whereas in 2-phase excitation control,
Although the rotation angle resolution is coarse by stepping by 1/4 tooth, the drive is performed at high speed.

The electronic control device 30 that drives the stepping motor 5 is
As shown in FIG. 2, the well-known CPU 31, ROM 32, R
It is mainly composed of a one-chip microcomputer equipped with an AM33, and further sends a vehicle speed signal from a vehicle speed sensor 41, a throttle distance signal from a throttle position sensor 7, a signal corresponding to the amount of depression from an accelerator sensor 43, etc. to a CPU 31. It includes a human-powered boat 34 that converts into a processable digital signal, a motor drive circuit 35 that converts a signal output from the CPU 31 into a drive signal for the stepping motor 5, and the like.

This electronic control device 30 reads each signal and map from the above-mentioned sensor, performs arithmetic processing according to a predetermined program, and controls the driving of the stepping motor 5. This control processing is performed according to the flowchart shown in FIG. explain. First, the first step 100 reads various data such as the vehicle speed sensor 41 and the accelerator sensor 43.

In the next step 105, based on the above various data,
Then, the target throttle distance θ0 is calculated using a predetermined map and calculation formula. In the following step 110, the current throttle distance θ is determined based on the output signal of the throttle position sensor 7. In the next step 115,
The above target throttle distance θQ and the above throttle/torque distance θ
0 (=100-01) is calculated for the deviation, and in the subsequent step 120, it is determined whether the deviation Δθ is less than or equal to the determination 1θa. When an affirmative determination is made in this step 120, that is, when it is determined that the current throttle angle θ is in a steady state with no significant difference from the target throttle angle θ0, the process advances to step 125; The number of driving steps of the stepping motor 5 corresponding to the above deviation is calculated. This calculated value is converted into a pulse signal for 1-2 phase excitation control in the subsequent step 130, and a drive output due to the 2-phase excitation is output to the motor drive circuit 35.

As a result, the stepping motor δ is driven by 1-2 phase excitation control, and the throttle valve 3 is driven precisely with respect to the target throttle distance θ0.

On the other hand, when a negative determination is made in step 120, that is, the current throttle distance θ and the target throttle distance θ0
When it is determined that the one-offset difference 80 is a large transient state, the process proceeds to step 135, where the number of driving steps of the stepping motor 5 corresponding to the deviation difference Δθ is calculated. This calculated value is converted into a pulse signal for two-phase excitation control in the subsequent step 140, and the drive signal is output to the motor drive circuit 35. Thereby, the stepping motor 5 is driven and controlled at high speed by two-phase excitation.

Next, the outline of the processing according to the above flowchart and its features will be explained using the time chart shown in FIG. 7. In FIG. 7, the vertical axis represents the throttle distance θ, and the present embodiment is shown using an actual LEA, and the conventional example is also shown using the dash-dot line B and the dash-dot line C. First, in this embodiment shown by the solid line A, at time to, the throttle distance θ is in a fully closed state, and when B0 is set as the target throttle distance at this time, the deviation Δθ is Direct θa or more. In such a state, 2 until time t1
Phase excitation is performed (steps 120.135.140)
. Subsequently, at time t2, when the deviation becomes less than θa,
Switched to 1-2 phase excitation (step 120.12
5.130). As a result, the throttle-to-throttle distance θ increases at a slow rate, and at time t2, the target throttle distance θ
Matches 0.

According to this embodiment, in the case of a transient state in which there is a large deviation Δθ0 between the throttle distance θ and the target throttle distance θ0, the throttle valve 3 per step of the stepping motor 5 On the other hand, when a steady state close to the target throttle angle θ0 is reached, the resolution per step of the stepping motor 5 is finely controlled, thereby achieving both speed and accuracy. Can be done.

In order to clarify the effect of the above embodiment, a comparison is made with a single excitation method according to the prior art. First, in the case of only two-phase excitation control shown by the - dotted chain line B, the throttle distance θ is
Although the target throttle distance θ0 is approached at high speed from time to, the target throttle distance θ0 is exceeded (B1) or the target throttle distance θ0 is not reached (B2), etc., when the target throttle distance θQ is reached. There are things I don't do. on the other hand,
In the case of 1-2 phase excitation shown by the two-dot chain line C, the target throttle angle θ0 matches, but the time until matching is t4.
It takes a long time. Therefore, this embodiment does not have such problems and has excellent effects as described above.

In addition, in this embodiment, since it is executed not only during idling but also in all running states during steady driving, 1-2 phase excitation is performed even when the steady state continues for a long time such as in auto drive. This enables highly accurate control and provides stable driving.

Furthermore, since the drive signal for the stepping motor 5 is only switched in two stages, the drive pulse rate will not be increased too much, and there will be no problem of the stepping motor 5 adjusting.

FIGS. 8 and 9 are according to the second embodiment. A deceleration mechanism 50 is provided between the stepping motor 5 and the throttle valve 3 as a resolution changing means.

The speed reduction mechanism 50 is externally fitted onto the output shaft δa of the stepping motor 5, and receives the spring force from the lever spring 51 and the solenoid 52.
a sleeve 53 that is slidably movable by electromagnetic force and has a clutch plate 53a at one end; a gear 54a that is rotatably fitted on the sleeve 53;
A gear 54b that meshes with this gear 54a, a gear 54c that is rotationally driven integrally with this gear 54b, and a gear 55 that meshes with this gear 54c and is fixed to the shaft of the throttle valve 3. and further includes a sleeve 53
A gear 56a rotatably supported by the gear 56a, a gear 56b meshing with the gear 56a, and a gear 56c meshing with the gear 56b and rotating integrally with the gear 55. There is.

In the above configuration, when the solenoid 52 is energized by outputting a speed ratio up signal (speed ratio=output shaft speed/input shaft speed) from the electronic control device 30, the Kurasochi plate 53a is activated by the spring of the spring 51. The sleeve 53 is attracted against the force, and the clutch plate 53a is connected to the gear 54a. Thereby, the driving force of the stepping motor 5 is transmitted to the throttle valve 3 via the gear 54a → gear 54b → gear 54c → gear 55, and the throttle valve 3 is rotationally driven. According to this drive path, the speed ratio is larger than in the case described later, and the throttle valve 3 is driven in a state where the rotation angle resolution per one step of the stepping motor 5 is large.

On the other hand, when the speed ratio down signal is output from the electronic control device 30 and the energization to the solenoid 52 is stopped, the clutch plate 53a slides integrally with the sleeve 53 due to the biasing force of the spring 51 and is connected to the gear 56a. Connected. Thereby, the driving force of the stepping motor 5 is transmitted to the throttle valve 3 via the gear 56a → gear 56b → gear 56c → gear 55, and the throttle valve 3 is rotationally driven. In this drive path, the speed ratio is smaller than in the case described above, and therefore the resolution per step of the stepping motor 5 is smaller.

In this way, the gear ratio adjustment changes depending on the presence or absence of a command signal to the solenoid 52 of the speed reduction mechanism 50, and the resolution of the throttle valve per step of the stepping motor 5 changes.

The main control process using this speed reduction mechanism 50 is performed according to the flowchart shown in FIG. In this process, steps 200 to 220 are similar to steps 100 to 120 in the flowchart of FIG. Therefore, if it is determined in step 220 that the deviation Δθ is less than or equal to the determination value θa and the steady state is determined, step 2
25, a speed ratio down signal is output. On the other hand, if the deviation is greater than or equal to the determination value 8a and it is determined that the transient state is present, the process advances to step 230, and a speed ratio up signal is output.

In the following step 235, the number of driving pulses of the stepping motor 5 corresponding to the deviation Δθ calculated in the step 215 is calculated, and in the next step 240, the stepping motor 5 is drive-controlled by two-phase excitation. . Therefore, in step 220 and step 22δ or step 230 of the above processing, the speed ratio is switched between two types via the reduction mechanism 50, and the rotational angular resolution of the throttle valve 3 is switched.

Moreover, it is also possible to set continuous fine resolution by using a continuously variable transmission mechanism 60 shown in FIG. 10 instead of the speed reduction mechanism 50 described above.

The continuously variable transmission mechanism 60 is connected to the output shaft 5 of the stepping motor 5.
The input end pulley 61 provided at a and the input end pulley 61
a spring 62 that applies a spring force to the output side, an output pulley 63 connected to the shaft of the throttle valve 3, a transmission belt 64 passed between the input end pulley 61 and the output pulley 63, and the output side It is configured to include an electromagnetic actuator 65 that changes the pulley ratio of the pulley 63. In the above configuration, when a speed ratio down signal is input to the electromagnetic actuator 65, the width of the output pulley 63 is narrowed, and at the same time, the width of the input end pulley 61 is widened by the spring force of the spring 62, so that the speed ratio is increased. As a result, the rotation angle resolution of the throttle valve 3 becomes smaller, and conversely, the electromagnetic actuator 6 becomes smaller.
When the speed ratio amplifier signal is inputted manually at step 5, the width of the output pulley 63 is widened, and at the same time, the convergence of the input pulley 61 is narrowed against the force of the spring 62, so that the speed ratio increases. Therefore, the resolution of the speed control of the throttle valve 3 increases. In this way, the rotational angular resolution of the throttle valve 3 per step of the stepping motor 5 is changed by the command signal to the electromagnetic actuator 65.

The flowchart in FIG. 11 shows another embodiment in which the transient state is determined based on the amount of change Δθ0 in the target throttle distance θ0. In this process, after reading various data, the current target throttle distance θQ is calculated (step 3
00). After that, step 3 reads out the target throttle distance θQ calculated in the previous process from the stored value θOLD.
o5), the amount of change Δθ0 with respect to the current target throttle distance θ0 is calculated (step 310). After that, it is determined whether the deviation Δθ0 is less than the determination value Δθa (
Step 315), in the case of an affirmative judgment, that is, when it is judged that the steady state is established, the stepping motor 5 is driven with high resolution. In this case, the stepping motor 5 is driven at a low resolution (Step 325). Next, the current target throttle distance θQ is set to the stored value θOLD for the next calculation process (step 330), and the process ends.

The processing of this flowchart will be explained according to the time chart showing the target throttle-to-torque distance θ0 and its variation Δθ0 in FIG. In this case, the amount of change Δθ0 changes as indicated by a dashed line E. Then, the amount of change △θQ is -△O with respect to the judgment value ±△θa.
If it is in the region expressed by a<ΔDo<Δθa, that is, in the shaded region in the figure, it is determined to be a steady state, and if it is in any other region, it is determined to be a transient state. Therefore, in the above embodiment as well, the rotation angle resolution of the throttle valve 3 is switched, and the target throttle distance θ
Accurate control that follows zero will be executed.

Note that the determination values θa and Δθa for switching the excitation method of the throttle valve 3 interval control are as in the above embodiment.
In addition to a method of simplifying the configuration by setting it to a constant value, a method of changing it according to the target throttle distance θQ may be used, and in this case, control with high -layer accuracy can be performed.

[Effects of the Invention] As explained above, according to the present invention, by changing the rotational angle resolution of the throttle valve during steady running and during transient running, the quick response of the throttle valve during transient and the target throttle speed can be improved.・It is possible to simultaneously satisfy accurate follow-up performance to the torque distance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a configuring motor showing an example of the basic configuration of the present invention, FIGS. 4 and 5 are waveform diagrams showing the operation of a stepping motor, and FIG. 7 is a time chart showing the operation of the second embodiment, FIG. 8 is a schematic configuration diagram showing the deceleration mechanism and its peripheral equipment according to the second embodiment,
FIG. 9 is a flowchart of the second embodiment, FIG. 10 is a schematic configuration diagram showing a continuously variable transmission mechanism according to the third embodiment, and FIG.
FIG. 1 is a flowchart showing the fourth embodiment, and the 12th indentation is a time chart of the fourth embodiment. Ml... Internal combustion engine M2... Intake pipe M3... Throttle valve M4... Stepping motor M5...
Operating state detection means M6... Control means M7... Transient state determination means M8... Resolution changing means 1... Intake pipe 3... Throttle valve 5... Stepping motor 30... Electronic control device 50... Reduction mechanism 60
...Continuously variable transmission mechanism agent Patent attorney Tsutomu Sadate (and 2 others) 3P Figure 1 Figure 3 Figure 34 Figure 51 Figure 2 Figure 7 Figure g18 Me Figure

Claims (1)

[Scope of Claims] A throttle valve provided in an intake pipe of an internal combustion engine, a stepping motor that adjusts the throttle valve position, an operating state detection means for detecting an operating state of the internal combustion engine, and an operating state detection means for detecting the operating state of the internal combustion engine. A control means for controlling the stepping motor based on the operating state from the means and an operating state output from the operating state detecting means to determine whether or not the throttle valve is in a transient state requiring high-speed operation. and a transient state determining means provided in the control means, wherein when the transient state determining means determines that the transient state is present, the throttle valve per step of the stepping motor is increased more than when the transient state is not determined as the transient state. 1. A throttle valve control device comprising: resolution changing means for increasing the resolution.