JPH11351034A - Study control method for electronic throttle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate malfunction such as non-lift-down of idle rotation speed and non-achievement of a desired engine output, by setting output signal value to a minimum output value when the output signal value is below minimum initial value, and learning the output signal value as a maximum output value when the output signal value exceeds a maximum initial value. SOLUTION: In a routine of a target rotation speed calculation, when a voltage value VA read by an accelerator sensor is below idle recognition initial value, the voltage value VA is set as a recognition value I (S52, S54). Therefore, this idle recognition value I is updated (studied) to a voltage value lower than a set idle recognition initial value. On the contrary, the voltage value VA is lower than the idle recognition initial value and is higher than the previous recognition initial value, the read voltage value VA is set as a whole opening recognition value W (S52, S53, S55). Therefore, the whole opening recognition value W is learned to a voltage value higher than the set whole opening recognition initial value. An unstable operation state of rapid rising of engine rotation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a learning control method of an electronic throttle in an engine mounted on a work vehicle, for example.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 61-279743.
An electronic throttle which controls an opening degree of a throttle valve on the basis of an output signal output from an accelerator sensor corresponding to an operation position of an accelerator pedal is known, as disclosed in Japanese Patent Application Laid-Open No. H11-260,086. In such an electronic throttle, the initial value of each output signal for the fully closed operation position and the fully opened operation position of the accelerator pedal is set in order to avoid the influence of an error when the accelerator sensor is assembled to the accelerator pedal. The actual output value of the accelerator sensor is learned based on the initial value, and the value of the output signal of the fully closed operation position and the value of the output signal of the fully opened operation position are finally determined.

More specifically, as shown in FIG. 6, an initial value (hereinafter referred to as a fully-closed initial value) Ip with respect to a fully-closed operation position.
Is set on the low output voltage side, and the initial value (hereinafter referred to as the full open initial value) Wp for the fully open operation position is set on the high output voltage side. Then, after the accelerator pedal is assembled with the accelerator sensor, if the output voltage falls below the fully closed initial value, the output signal that falls below this value is stored as the output voltage at the fully closed operating position. When a lower output voltage is generated in the stored output voltage, the lower output voltage is stored, and the learned output voltage is sequentially updated and learned to the latest lower output voltage. On the other hand, when the output voltage for the fully open operation position is higher than the full open initial value, the output voltage is stored as the output voltage of the fully open operation position, and thereafter, when an output voltage exceeding the stored output voltage is generated. Are subjected to update learning at the output voltage.

[0004]

In the above configuration,
Depending on the state at the time of assembly, as shown by an arrow A or B in FIG. 6, the output signal of the accelerator sensor is set to a reference fully assembled initial value Ip indicating a range of an output signal at an assembly position (indicated by an arrow N). If it is biased to the side or the fully open initial value Wp side, a state where learning is not performed correctly occurs. That is, when the accelerator pedal is operated to the fully-closed operation position when the output voltage of the accelerator sensor at that time is larger than the set fully-closed initial value Ip, when the accelerator pedal is depressed toward the full-open initial value Wp side. , Fully closed initial value I
A state occurs in which no learning is performed at p. Similarly, in the case where the vehicle is biased toward the fully closed initial value Ip side, even if the accelerator pedal is operated to the fully open operating position, when the output voltage of the accelerator sensor is smaller than the fully open initial value Wp,
A state occurs in which learning is not performed with the fully open initial value Wp.

[0005] As described above, if the output voltage for the fully closed and fully opened operation positions is not learned, there is a problem that the idle speed of the engine does not decrease or a desired engine output cannot be obtained even when the engine is fully opened. occured.
An object of the present invention is to solve such a problem.

[0006]

In order to achieve such an object, the present application employs the following means. That is, in the electronic throttle learning control method according to the first aspect of the present invention, the value of the output signal of the accelerator operation position detecting means corresponding to the minimum operation position and the maximum operation position of the accelerator operation body is set to the minimum initial value. Learning based on the maximum initial value set below the minimum initial value,
When the output signal value falls below the minimum initial value, the output signal value is learned as the minimum output value, and when the output signal value exceeds the maximum initial value, the output signal value is learned as the maximum output value. It is a configuration to do.

In the electronic throttle learning control method according to the present invention, the output signal value of the accelerator operation position detecting means corresponding to the minimum operation position and the maximum operation position of the accelerator operation body is set to a minimum initial value. Learning based on the value and the maximum initial value set below the minimum initial value.When the value of the output signal falls below the minimum initial value, the value of the output signal is learned as the minimum output value, and output is performed. When the value of the signal exceeds the maximum initial value, the value of the output signal is learned as the maximum output value, and when the difference between the minimum output value and the maximum output value is smaller than a predetermined value, a predetermined target rotation speed is obtained. Thus, the throttle valve is controlled as described above.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application is an electronic throttle for controlling the opening of a throttle valve of an internal combustion engine in accordance with an output signal of an accelerator operation position detecting means for detecting an operation position of an accelerator operation body. In the electronic throttle learning control method of learning the value of the output signal of the case where the operation position of the accelerator operation body is the minimum and the case where the operation position of the accelerator operation body is the maximum, the operation position of the accelerator operation body Set the minimum initial value for the output signal when it is minimum, set the maximum initial value for the output signal when the operating position of the accelerator operation body is maximum to a value below the minimum initial value, and operate the accelerator operation body As a result, when an output signal lower than the minimum initial value is generated, the value of the output signal is learned as the minimum output value when the operating position of the accelerator operation body is the minimum, and the access An electronic throttle characterized in that, when an output signal exceeding a maximum initial value is generated by operating the operating body, the value of the output signal is learned as a maximum output value when the operating position of the accelerator operating body is at a maximum. Is a learning control method.

According to a second aspect of the present invention, there is provided an electronic throttle for controlling an opening of a throttle valve of an internal combustion engine in accordance with an output signal of an accelerator operation position detecting means for detecting an operation position of an accelerator operation body. An electronic throttle learning control method for learning the value of an output signal when the operating position of an accelerator operating body is a minimum and a maximum when the operating position of an accelerator operating body is a minimum. By setting the minimum initial value for the output signal in a certain case, setting the maximum initial value for the output signal when the operating position of the accelerator operation body is the maximum to a value below the minimum initial value, and operating the accelerator operation body When an output signal lower than the minimum initial value is generated, the value of the output signal is learned as the minimum output value when the operating position of the accelerator operation body is the minimum, and the accelerator When an output signal exceeding the maximum initial value is generated by operating the crop, the value of the output signal is learned as the maximum output value when the operating position of the accelerator operation body is maximum, and the learned minimum output value and An electronic throttle learning control method characterized by controlling a throttle valve so as to reach a predetermined target rotational speed when a difference from a maximum output value is smaller than a predetermined value.

According to such a configuration, the minimum initial value is set to be larger than the maximum initial value, and when the value of the output signal falls below the minimum initial value, the minimum output value is learned, and the value of the output signal becomes maximum. Since the maximum output value is learned when the initial value is exceeded, the output signal of the accelerator operation position detecting means is always output even if the position of the accelerator operation position detecting means with respect to the accelerator operation body is shifted from the reference position. Learning of the minimum output value and the maximum output value can be performed.

When the difference between the learned minimum output value and the maximum output value is less than a predetermined value, the engine speed is set to a predetermined target rotational speed, in other words, it depends on the output signal of the accelerator operating position detecting means. If the throttle valve is configured to be controlled without changing, the transition from the learned minimum output value to the maximum output value prevents the throttle valve from being opened and closed rapidly. Therefore, it is possible to avoid that the throttle valve is fully opened instantaneously and the engine is operated at a high output, so that safety can be improved.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of the electronic throttle. The electronic throttle is the accelerator pedal 1 which is the accelerator operation body
, An throttle sensor 4 for detecting the opening of a throttle valve 3 of an engine (not shown), a voltage signal as an output signal from the accelerator sensor 2 and a throttle. An electronic control unit 5 that processes an opening signal output from the sensor 4 and an actuator 6 that controls the opening of the throttle valve 3 by a drive signal output from the electronic control unit 5 are provided. The accelerator sensor 2 is interlocked with the operation of the accelerator pedal 1 so that when the accelerator pedal 1 is depressed, a voltage signal corresponding to the depression amount, that is, the operation position is output.

The electronic control unit 5 is mainly composed of a microcomputer 5a, and has two analog / digital converters (hereinafter referred to as A / D converters) 5b,
5c, a memory 5d for battery backup, a digital / analog converter (hereinafter referred to as a D / A converter) 5e, and a drive circuit 5f. One of A
The / D converter 5b is connected to the accelerator sensor 2, the other A / D converter 5c is connected to the throttle sensor 4, and each is connected to the microcomputer 5a. The memory 5d stores an idle recognition initial value Io as a set minimum initial value and a fully open recognition initial value W as a maximum initial value.
o is stored, and the idle recognition value I, which is the minimum output value learned from the accelerator sensor 2, and the fully open recognition value W, which is the maximum output value, are stored. The idle recognition initial value Io is set for an output signal when the operating position of the accelerator pedal 1 is at a minimum, and the fully open recognition initial value Wo is
The output signal when the operation position of the accelerator pedal 1 is at the maximum is set to a value lower than the idle recognition initial value Io. Each of the A / D converters 5b and 5c converts an input voltage signal into digital data and outputs the digital data to the microcomputer 5a.

The electronic control unit 5 includes an accelerator pedal 1
Is operated by operating the accelerator pedal 1 to accurately detect the operating position of the accelerator pedal 1 without being affected by errors when the accelerator sensor 2 is assembled.
When the output signal falls below the value, the value of the output signal is learned as the idle recognition value I when the operating position of the accelerator pedal 1 is at a minimum, and the idle recognition initial value Io is exceeded by operating the accelerator pedal 1. When an output signal exceeding the full open recognition initial value Wo is generated, the value of the output signal is learned as a fully open recognition value when the operating position of the accelerator pedal 1 is at the maximum.

In addition, in order to improve safety in controlling the throttle valve 3, if the difference between the learned minimum output value and the learned maximum output value is smaller than a predetermined value, a predetermined target rotation speed set in advance is set. It is programmed to control the throttle valve 3 so as to be a number. The schematic configuration of the program for the learning control of the electronic throttle is as shown in FIGS. This program is repeatedly executed after the ignition switch is turned on.

In the main routine shown in FIG. 2, in step S1, the battery (not shown) is removed for inspection or the like, and the power supply of the electronic control unit 5 is completely cut off and then turned on again (power-on reset). It is determined whether or not. In step S2, the idle recognition initial value Io is set to the idle recognition value I of the accelerator sensor 2, and the fully open recognition initial value Wo is set to the fully open recognition value W. In step S3, as described later, the voltage value _VA of the voltage signal of the accelerator sensor 2 is read, and the read voltage value _VA , idle target rotation speed N _IDLE , and maximum target rotation speed N _MAX are read.
, The target rotation speed N _SET is calculated. Step S
In step 4, other controls for controlling the throttle valve 3 corresponding to the operated accelerator pedal 1, for example, processing of an output signal from the throttle sensor 4, processing for generating a drive signal for the actuator 6, and the like are executed. I do.

In this main routine, in order to eliminate the inconvenience when the power supply voltage supplied to the accelerator sensor 2 and the electronic control unit 5 does not reach a predetermined voltage value after the ignition switch is turned on. The following control may be added. That is, since the rise of the voltage supplied from the battery after the ignition switch is turned on is lower than the normal voltage value,
At the time of the rise, the output voltage of the accelerator sensor 2 becomes low, so that an erroneous output signal is output. When signal processing is performed by the electronic control unit 5 in a state where power is not established by such an output signal, further erroneous processing is performed in the calculation of the target rotation speed N _SET , and normal control of the throttle valve 3 is difficult. It may be.

In order to solve the above-mentioned problems,
As a power source for the accelerator sensor 2 and the electronic control unit 5, it is determined whether or not the supplied voltage value has reached a predetermined voltage value. If the voltage value has been reached, it is determined that the power source has been established. The configuration is such that the calculation of the target rotation speed N _SET is not performed. Similarly, when the main switch is configured to execute the main routine when the ignition switch is not turned on, the state of the ignition switch is determined.If the ignition switch is turned on, the above-described power supply establishing step is executed. If it is off, the memory backup may be executed in the low power consumption mode.

The general configuration of the routine for calculating the target rotational speed is as follows.
As shown in FIG. In step S51, the voltage value _VA of the output signal of the accelerator sensor 2 is read from the digital data output from the A / D converter 5b. In step S52, it is determined whether or not the read voltage value _VA is lower than the idle opening recognition value I. Step S
At 53, it is determined whether or not the read voltage value _VA exceeds the full open recognition value W. In step S54, the idle recognition value I is set with the read voltage value _VA . In step S55, the voltage value V _{A obtained} by reading the full open recognition value W
Set with. In step S56, it is determined whether or not the fully open recognition value W exceeds the idle recognition value I. In step S57, a target rotation speed N _SET is calculated based on the following equation. N _SET = N _IDLE + {( _VA− I) / (WI)} (N _MAX −N _IDLE ) (1)

In step S58, the target rotation speed N _SET is set to the idle target rotation speed N _IDLE . In such a configuration, when the accelerator sensor 2 is assembled to the accelerator pedal 1 and the power is connected to the electronic control unit 5 and the ignition switch is first turned on, the control proceeds to steps S1, S2, SS3, and S4, The idle recognition initial value Io and the fully open recognition initial value Wo stored in the memory 5d
Is set to the idling recognition value I and the full-opening recognition value W, respectively, the target rotation speed N _SET is set, and another control for controlling the throttle valve 3 is executed. It learns I and the fully open recognition value W. When the ignition switch is turned on next time, since the power-on reset is not performed, the control proceeds to steps S1, S3, and S4, and the target rotation speed N _{SET is} calculated based on the previously learned idle recognition value I and the fully-open recognition value W. Is calculated.

[0021] In routine for calculating the target rotational speed N _SET in step S3, to perform the learning control of an idle recognition value I of the accelerator sensor 2 is fully opened recognition value W before calculating the target rotational speed N _SET. That is, when the voltage value _VA read by the accelerator sensor 2 is lower than the idle recognition initial value Io (determined as true in step S52),
As shown in FIG. 4, step S54 is executed to set the read voltage value _VA as the idling recognition value I. Therefore, at this point, the idle recognition value I is updated (learned) to a voltage value lower than the set idle recognition initial value Io. On the other hand, the voltage value _VA is lower than the idle recognition initial value Io, and the fully open recognition initial value Wo
If it exceeds, the control proceeds from step S51 → S52 → S
The process proceeds from 53 to S55, and the read voltage value _VA is set as the fully open recognition value W. For this reason, the full open recognition value W is updated to a voltage value higher than the set full open recognition initial value Wo (learning).
Is what is done. Thus, steps S52 → S5
4 and steps S52 → S53 → S55 are repeatedly executed, whereby learning of the idle recognition value I and the fully open recognition value W is accurately performed. When the read voltage value _VA is equal to or greater than the idling recognition value I and equal to or less than the full-open recognition value W, the read voltage value _VA exists between the idle recognition value I and the full-open recognition value W. , Do not learn.

Thereafter, the fully open recognition value W becomes equal to the idle recognition value I.
Is greater than the control, the control proceeds from step S56 to step S5.
Run 7 calculates a target rotational speed N _SET, controls the opening of the throttle valve 3 so that the target speed N _{S ET.} On the other hand, when the fully open recognition value is equal to or less than the W idle recognition value I, that is, the idle recognition value I and the fully open recognition value
If the idle recognition value I is larger than the full-open recognition value W, the operation position of the accelerator pedal 1 cannot be accurately detected, and the control proceeds to step S5.
The process proceeds from S6 to S58, and the target rotation speed N _SET is set to the idle target rotation speed N _IDLE to prevent the engine rotation speed from becoming unstable due to the operation of the accelerator pedal 1.

As described above, by setting the fully open recognition initial value Wo smaller than the idle recognition initial value Io,
When the accelerator sensor 2 is assembled, the idling recognition value I and the full-open recognition value W can be accurately learned even if it deviates from the reference position. Therefore, the operating position of the accelerator pedal 1 can be accurately detected even if the accuracy of the assembling is rough, so that the assembling work efficiency can be improved.

In the above-described control, in order to prevent the engine from changing from the idling operation state to the operation state in which the throttle valve 3 is fully opened when the idling recognition value I and the fully open recognition value W are learned at the approaching position. The determination condition of step S56 may be set as follows. That is, as shown in FIG. 5, the minimum accelerator allowable opening A _IWDE which is the minimum operating position of the accelerator pedal 1 is set, and the fully open recognition value W becomes a value exceeding a predetermined range from the idle recognition value I. Is the judgment condition. W> I + A _WIDE (2)

By comparing the idle recognition value I after learning with the full-open recognition value W, when the learned full-open recognition value W approaches the idle recognition value I, the full-open recognition value W Minimum permissible accelerator opening A from recognition value I
_If it is not _farther than _IWDE , target speed N _SET
Is set, and the throttle valve 3 is controlled without depending on the voltage value _VA of the output signal of the accelerator sensor 2. That is, in this case, the control proceeds to step S58 to set the target rotation speed N _SET to the idle target rotation speed N _IDLE irrespective of the operating position of the accelerator pedal 1,
This is for controlling the throttle valve 3.

Therefore, if the learning of the accelerator recognition value I and the full-open recognition value W is not completed, and if the two come close to each other by less than the minimum accelerator allowable opening A _WIDE , Since the target rotation speed N _SET is set to the idle target rotation speed N _IDLE , it is possible to prevent an unstable operation state in which the rotation of the engine rapidly rises. Therefore, it is possible to reliably prevent the vehicle from suddenly increasing in speed and becoming difficult to drive.

The present invention is not limited to the embodiment described above. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0028]

As described above, according to the first aspect of the present invention, the minimum initial value is set to be larger than the maximum initial value, and when the value of the output signal falls below the minimum initial value, the minimum output value is set. Since the value is learned and the maximum output value is learned when the value of the output signal exceeds the maximum initial value, even if the mounting position of the accelerator operation position detecting means with respect to the accelerator operation body is shifted from the normal position, The learning of the minimum output value and the maximum output value of the output signal of the accelerator operation position detecting means can be always performed.

According to the second aspect of the present invention, when the difference between the learned minimum output value and the maximum output value is smaller than a predetermined value, the throttle valve is set to a predetermined target rotational speed. If the control is performed, the throttle valve is not opened and closed suddenly by shifting from the learned minimum output value to the maximum output value. Therefore,
It is possible to avoid that the throttle valve is fully opened instantaneously and the internal combustion engine is operated at a high output, thereby improving safety.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a schematic control procedure of the embodiment.

FIG. 3 is a flowchart showing a schematic control procedure of the embodiment.

FIG. 4 is an operation explanatory view of the embodiment.

FIG. 5 is an operation explanatory view of a modification of the embodiment.

FIG. 6 is an operation explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Accelerator pedal 2 ... Accelerator sensor 3 ... Throttle valve 4 ... Throttle sensor 5 ... Electronic control device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidekazu Tanaka 2-1-1 Taoyuan, Ikeda-shi, Osaka Daihatsu Industry Co., Ltd. (72) Inventor Satoshi Hitomi 3744 Ooka, Numazu-shi, Shizuoka Kokusai Electric Co., Ltd. Inside

Claims (2)

[Claims] An electronic throttle for controlling an opening of a throttle valve of an internal combustion engine in accordance with an output signal of an accelerator operating position detecting means for detecting an operating position of an accelerator operating body, wherein the operating position of the accelerator operating body is minimum. A learning control method for an electronic throttle that learns the value of an output signal between a case and a maximum according to an operation position, wherein a minimum initial value for an output signal when an operation position of an accelerator operation body is a minimum is determined. Set the maximum initial value for the output signal when the operating position of the accelerator operation body is the maximum to a value below the minimum initial value, and operating the accelerator operation body generates an output signal below the minimum initial value. At that time, the value of the output signal is learned as the minimum output value when the operating position of the accelerator operation body is the minimum, and the maximum initial value is obtained by operating the accelerator operation body. A learning control method for an electronic throttle, wherein when an output signal exceeding a period value is generated, the value of the output signal is learned as a maximum output value when the operating position of the accelerator operation body is at a maximum. 2. An electronic throttle for controlling an opening of a throttle valve of an internal combustion engine in accordance with an output signal of an accelerator operating position detecting means for detecting an operating position of an accelerator operating body, wherein the operating position of the accelerator operating body is minimum. A learning control method for an electronic throttle that learns the value of an output signal between a case and a maximum according to an operation position, wherein a minimum initial value for an output signal when an operation position of an accelerator operation body is a minimum is determined. Set the maximum initial value for the output signal when the operating position of the accelerator operation body is the maximum to a value below the minimum initial value, and operating the accelerator operation body generates an output signal below the minimum initial value. At that time, the value of the output signal is learned as the minimum output value when the operating position of the accelerator operation body is the minimum, and the maximum initial value is obtained by operating the accelerator operation body. When an output signal exceeding the initial value occurs, the value of the output signal is learned as the maximum output value when the operating position of the accelerator operation body is at the maximum, and the difference between the learned minimum output value and the maximum output value is determined. A learning control method for an electronic throttle, wherein a throttle valve is controlled so as to reach a predetermined target rotation speed when the rotation speed falls below a predetermined value.