JPH0337357A - Throttle opening degree detector - Google Patents

Abstract

PURPOSE:To improve the precision in the learning of a perfect closure standard value by judging each deflection on the closing side and opening side of a throttle valve for the perfect closure standard value at the detection value of the opening degree of the throttle valve and calculating and renewing the perfect closure standard value according to each deflection. CONSTITUTION:A throttle valve 2 arranged onto a throttle body 1 is opening/ closing-driven by the operation of an accelerator pedal 3, and opening/closing- controlled by a control unit 10 on the basis of the detection signal of a throttle opening degree sensor 6. In this case, in the control unit 10, the detection value of the throttle opening degree sensor 6 is compared by a means 11 with the value which is obtained by adding the perfect closure standard value and the allowable variation portion in the preceding time which are memorized in a means 14. Each deflection on the closure side and opening side of the throttle valve 2 for the perfect closure standard value is judged, and the perfect closure standard value is calculated and renewed and renewed according to each deflection. Therefore, the perfect closure of the throttle is judged always correctly by a means 12, and the throttle opening degree is set by a means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle opening detection device that uses a throttle opening sensor in a vehicle engine to detect the fully closed position of a throttle valve using software. , which learns and updates the fully closed reference value in the closing direction and opening direction of the throttle valve, respectively.

[Conventional technology]

Generally, various electronic controls are performed on vehicle engines, such as fast idle control when idling with a fully closed throttle, and fuel cut control when decelerating. For these various controls in the fully closed throttle state, a device is provided to detect the fully closed throttle position.

As a device for detecting the throttle fully closed position, there is a method of attaching an ON-OFF type idle switch to the valve shaft of the throttle valve and mechanically operating the switch at the fully closed position to detect the fully closed position. This method using a mechanical idle switch cannot correct or follow deviations in the fully closed position due to individual variations or aging. Therefore, a method has been proposed in which a throttle opening sensor is attached to the throttle valve, and the signal from the throttle opening sensor is electrically processed to learn and update the fully closed position and the fully closed position using software. There is.

Conventionally, regarding the detection device using computer software for the fully closed throttle position, for example, Japanese Patent Publication No. 63-1546
There is a prior art in Publication No. 7. Here, when the engine is first started, the throttle valve opening at that time is memorized as the minimum value,
Thereafter, each time a signal indicating that the opening is smaller than this is manually input, this voltage value is stored as a new fully closed position, and by comparing this memorized value with the current value detected by the throttle opening sensor, the throttle is fully closed. It has been shown to detect the closed position.

[Problem to be solved by the invention]

By the way, in the prior art mentioned above, the fully closed reference value (fully closed (n M )) is set only in the closing direction of the throttle opening.
will be updated, so it will be completely closed due to changes over time! ! If the standard value changes to the closing side, it can be tracked, but conversely, if the fully closed reference value changes to the open side due to temperature changes or dirt on the throttle body, it cannot be followed. Additionally, when the voltage signal of the throttle valve opening sensor changes, the voltage value itself is updated as the new fully closed reference f$ value, which increases the variation in the fully closed reference value and makes it difficult to perform various controls smoothly. .

The present invention has been made in view of the above, and its purpose is to enable learning of the fully closed reference value to follow not only the closing direction of the throttle valve but also the opening direction when the software detects a fully closed throttle. It is an object of the present invention to provide a throttle opening degree detection device that can perform processing and update in a manner that improves the degree of learning of a fully closed reference value and further suppresses fluctuations in the fully closed reference value.

[Means to solve the problem]

In order to achieve the above object, the throttle opening detection device of the present invention compares the fully closed reference value of the fully closed reference value storage means with the output of the throttle opening sensor, and determines the fully closed reference value according to the difference between the two. A throttle opening detection device that calculates and updates the throttle opening sensor determines the deviation between the closing and opening sides of the throttle valve with respect to the fully closed reference value of the output of the throttle opening sensor, and sets the fully closed standard according to each deviation. A throttle opening reference value calculation means is provided for calculating and updating the value.

[Operation] Based on the above configuration, the throttle opening reference value calculation means calculates a new fully closed reference value even when the fully closed reference value deviates not only to the closing side but also to the opening side of the throttle valve. Update the value of the storage means. As a result, the fully closed determination means and the throttle opening setting means can always accurately determine whether the throttle is fully closed and set the throttle opening by comparing the fully closed reference value and the output of the throttle opening sensor.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a throttle body of the engine intake system. A throttle valve 2 is provided on this throttle body 1 so as to be opened and closed by operating an accelerator pedal 3, and an idle control valve is provided in a bypass passage 4 for the throttle valve 2. 5 is provided. Further, a throttle opening sensor 6 is attached to the throttle valve 2, and the output signal of the throttle opening sensor B is manually processed by the control unit IO.

The control unit IO receives the output α of the throttle opening sensor B.
Throttle opening standard value calculation means If, fully closed judgment means 12. It has a throttle opening setting means 13.

The throttle opening reference value calculation means 11 calculates the previous fully closed reference value αff1i stored in the fully closed reference value storage means 14.
The output α of the throttle opening sensor 6 is compared with the value α5ined which is the sum of n and the allowable change amount d. Then, when the fully closed reference value αmIn deviates to the closing side of the throttle valve 2 and the condition is αa+In, when the output α of the throttle opening sensor 6 is continuously measured by MQ rotation 1, a predetermined constant n A new totally closed reference value αsin is calculated by weighted averaging, and this value is stored in the totally closed reference t$ value storage means 14. In addition, in the case of the condition αa+1n≦α≦α−1n+d,
It is determined that the fully closed reference value αsin has deviated to the opening side of the throttle valve 2, and in this case, the frequency is measured and the most frequent value is weighted and averaged using a predetermined constant m to set a new fully closed value. A reference value αin is calculated. This value is also stored, and in this way, when the fully closed reference value αsin changes either toward the closing side or the opening side of the throttle valve 2, the fully closed reference value α■in is updated.

The fully closed determination means 12 uses the output α of the throttle opening sensor B.
is compared with the value obtained by adding the allowable change amount d to the fully closed base intermediate value α-1n, and when α≦αmIn+d, it is determined that the throttle is fully closed. This fully closed signal is then manually inputted to, for example, a fast idle control means 15, which outputs a predetermined fast idle signal to the idle control valve 5 during idle.

The throttle opening setting means 13 determines the fully closed reference value α of the fully closed reference value storage means I4 from the output α of the throttle opening sensor B.
By subtracting win, the throttle opening degree αr is calculated as follows.

α'-α-αmin Then, the value of this throttle opening αr is determined by the various control means 1
6 is now man-powered.

Next, the operation of the groove bottom throttle opening detection device will be described using the flowchart shown in FIG.

First, when the ignition switch (not shown) is turned on, the routine shown in FIG.
is compared with the output α. When starting the engine, the throttle valve 2 is normally in a fully closed state, but the initial value αI is set to a sufficiently large value (
Therefore, normally, the output α of the throttle opening sensor B becomes sufficiently smaller than the initial value αI before proceeding to step 5102. Step 51
02, it is compared with α-In+d, but if there is no previous fully closed reference value αmIn, it is set to αwinξαl, so the process advances to steps 8103 and 5104. If it is the first time, in step 5105, the output α of the throttle opening sensor B is added to the previous value αX, the counter M is reset, and the flow proceeds to steps 5106 and 8107. From the second time onward, the process advances from step 8104 to step 5toe, where the counter M is incremented and the count continues to be incremented.

Once the times have been measured, step 8107 to step 5toe
Then, the fully closed reference value α is determined by weighted averaging using a predetermined constant n.
-1n is calculated and the memory is updated.

In this way, when starting the engine, the actual value is changed to the fully closed reference value α−.
In is set quickly.

Note that the output α of the throttle opening sensor B is the initial value α! If larger, step 5IOI to step 510
The process proceeds to step 9, where the initial value α1 is entered into the previous value αX, and the counter M is reset to maintain the initial state.

On the other hand, at this time, in the throttle fully closed determination routine shown in FIG. 2(b), in step 8201, the throttle opening sensor B
The outputs α of are compared. Therefore, before updating the fully closed reference value α■in, α■1n 4α! After the update, the relationship is always α5ined 'aα based on the fully closed reference value α-1p, and the process proceeds to step 5202, where it is determined that the throttle is fully closed and various controls such as fast idle are performed.

During operation after starting the engine, each time the throttle valve 2 returns to the fully closed position, step 8 of the routine in FIG. 2(a) is performed.
At 102.5LQ8, the fully closed reference value αsin is checked based on the output α of the throttle opening sensor 6. If the fully closed reference value αsin deviates to the closing side of the throttle valve 2 as at time tl in FIG.
Only when the output α of the same throttle opening sensor 6 is continuously outputted MQ times by toe, 5toy, and stog, the completely closed base intermediate value a min is updated to the closing side by weighted average. For this reason, the totally closed group'? 'l Ii
a Q sin follows this deviation and iE is accurately set.

On the other hand, due to dirt etc. on the throttle valve 2, α■1n≦α≦α
m1ned, when the open group single chain αll1n shifts to the open side as at time tl in FIG. 3, step 5103
The process then proceeds to step 5tto, where the amount of deviation i is calculated.

Here, as shown in step 3114, an address N is written in the RAM work area for each shift amount l.

.about.Nd is provided, and in step 5ttt, a counter N1 for each deviation amount 1 is incremented, and in this way, the frequency 1l11 is determined as to whether the deviation jli is the largest or not. Then, in step 8112, the output α of the throttle opening sensor 6 corresponding to the deviation amount i that has reached Nn times for the first time is selected, and based on this output α, the fully closed reference value α■In is calculated by weighted averaging in step 5113. , based on this, the throttle valve 2 is updated to the opening side. In this way, in this case, a large number of values of the output α of the throttle opening sensor 6 are taken in, and the fully closed reference value αl1 is determined more accurately from the frequency of the deviation 12Li.
In is updated. Also, based on this updated accurate fully closed reference value αsin, the throttle fully closed 1 shown in FIG. 2(b) is
A first determination is made.

On the other hand, while the engine is running, the throttle opening setting routine shown in FIG. The value of this throttle opening degree αr is manually input to each control system.

FIG. 4 is another flowchart for calculating the throttle fully closed reference value according to the present invention.

This 1 step 8402.5403.5404
Under the condition of amIn+daα, the counter N is always incremented and the fully closed reference value α-1 is set at step 5405.
It is divided based on the relationship between n and the output α of the throttle opening sensor 6. If αsin >α, step 8406
In step 5407, the same output a is measured N8 times in succession, and the weighted average is updated in step 5407. Also α5in
In the case of ed, the process proceeds from step 5405 to step 8408, and when the same output α is measured Nn times in succession, which is sufficiently greater than Ns times, it is updated by weighted averaging in step 5409. As well as the side
It is updated by the number of consecutive times the same output α of the throttle opening sensor B is output.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto.

〔Effect of the invention〕

As described above, according to the present invention, in software-based throttle fully closed detection using a throttle opening sensor, the fully closed reference value is updated not only on the closed side of the throttle valve but also on the open side by the sensor output. Therefore, the accuracy of the fully closed reference value is greatly improved. Therefore, the accuracy of each @ control during idling and deceleration, and calculation of the throttle opening degree can also be improved based on the throttle fully closed determination.

Furthermore, since the fully closed reference value is updated by measuring the frequency with respect to the deviation of the fully closed I&Y value on the opening side of the throttle valve, updating can be performed accurately.

Furthermore, if the fully closed reference value is updated for the deviation on the opening side of the throttle valve when the number of continuous outputs of the same sensor output is detected, a predetermined accuracy is ensured and the memory capacity of the RAM can be reduced.

Further, since the fully closed reference value is calculated by weighted average processing, it is preferable that there is little variation in the base value.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the throttle opening detection device of the present invention, and Fig. 2 (a) or C) shows the update of the throttle fully closed reference value, the fully closed t, 11 constant, and the throttle opening setting. FIG. 3 is a flowchart showing the operation of the control. FIG. 3 is a chart showing the relationship between the fully closed reference value and the throttle opening sensor output. FIG. 4 is a flowchart showing the operation of other controls. 2... Throttle valve, 6... Throttle opening sensor, IO... Control unit, 11... Throttle opening base and value calculation means, 12... Fully closed i111 means, 14.
・Totally closed heavy chain storage means

Claims (5)

[Claims] (1) In a throttle opening detection device that compares the fully closed reference value of the fully closed reference value storage means and the output of the throttle opening sensor, and calculates and updates the fully closed reference value according to the discrepancy between the two, the above-mentioned Throttle opening reference value calculation means that determines the deviation between the closing side and the opening side of the throttle valve with respect to the fully closed reference value of the output of the throttle opening sensor, and calculates and updates the fully closed reference value according to each deviation. A throttle opening detection device characterized by being provided. (2) When the output of the throttle opening sensor deviates from the fully closed reference value to the throttle valve closing side, the throttle opening reference value calculating means calculates that the output of the throttle opening sensor continues for a predetermined number of times. A new fully closed reference value is calculated by the weighted average of the output of the throttle opening sensor and the fully closed reference value. The throttle opening detection device according to claim 1, further comprising calculating a new fully closed reference value by a weighted average of the sensor output with the highest frequency of deviation and the fully closed reference value. . (3) The throttle opening reference value calculation means calculates the output of the throttle opening sensor even if the output of the throttle opening sensor deviates from the fully closed reference value on either the closing side or the opening side of the throttle valve. When the value becomes the same for a predetermined number of consecutive times, a fully closed reference value is calculated by a weighted average using the output of the throttle opening sensor, and the reference value for fully closed is calculated using a weighted average using the output of the throttle opening sensor. The throttle opening detection device according to claim 1, wherein the throttle opening detection device is configured to reduce the number of openings. (4) Claim (1) further comprising fully closed determination means for determining whether the throttle is fully closed by comparing the fully closed reference value stored in the fully closed reference value storage means with the output of the throttle opening sensor.
), (2) or (3). (5) The throttle opening is set based on the difference between the output of the throttle opening sensor and a fully closed reference value stored in the fully closed reference value storage means (1), (2), or (3).
) throttle opening detection device.