JPH0635846B2 - Remote control device for vehicle throttle valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is for a vehicle in which a throttle valve that is not mechanically connected to an accelerator operator is remotely operated according to the operation amount of the accelerator operator. The present invention relates to a throttle valve remote control device.

<< Background of the Invention >> As this type of device, a device disclosed in Japanese Patent Laid-Open No. 59-58131 has been proposed, and the position of the accelerator operator (referred to as an operation amount) is an absolute displacement amount by a potentiometer or the like. Has been detected as.

Then, the throttle valve operation amount corresponding to the detected operation amount of the accelerator operator is obtained from the preset accelerator operation amount-throttle valve operation amount characteristic, and the opening of the throttle valve can be remotely controlled according to the operation amount. Has been adjusted.

However, in the past, the driver does not apply a load to the accelerator operator (referred to as a no-operation state).
And the accelerator operation amount detector must be attached so that the detected accelerator operation amount at that time matches.
Therefore, there has been a problem that the mounting requires a lot of labor and time.

<Purpose of the Invention> The present invention has been made in view of the above conventional problems,
The purpose thereof is to facilitate the work of attaching the device for detecting the operation amount of the accelerator operator and to improve the efficiency thereof.

<< Structure of the Invention >> In order to achieve the above object, the present invention provides an accelerator operation amount detection means for detecting an operation amount of an accelerator operator and a minimum accelerator operation amount as shown in FIG. A plurality of detected accelerator operation amount-throttle valve operation amount characteristics are set, characteristic setting means, minimum value storage means for storing the minimum value of the detected accelerator operation amount from the start of operation, and minimum detected accelerator operation amount. Characteristic selecting means for selecting the accelerator operation amount-throttle valve operation amount characteristic corresponding to the value, and the throttle valve operation amount corresponding to the detected accelerator operation amount is obtained from the selected accelerator operation amount-throttle valve operation amount characteristic. A throttle valve operation amount calculation means and throttle valve drive means for driving the throttle valve in accordance with the slot valve operation amount calculated by the throttle valve operation amount calculation means. It is characterized by including.

<Operation> With the above configuration, a plurality of detected accelerator operation amounts −
A throttle valve operation amount characteristic is prepared in advance, the minimum operation amount of the accelerator operator is stored, a characteristic corresponding to the minimum value is selected, and the throttle valve operation amount is obtained from this characteristic.

<< Description of Embodiments >> Preferred embodiments of an apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 2, the depression amount (operation amount) of the accelerator pedal 10 is detected by the potentiometer 12, and the detected accelerator operation amount 200 is sent to the microcomputer 16 provided in the control signal generation unit 14 to the A / D converter 1.
8 is supplied.

An accelerator operation amount-throttle valve operation amount characteristic is preset in the microcomputer 16 and the throttle valve operation amount 202 obtained from this characteristic is supplied to the motor driver 22.

Then, the motor driver 22 uses this throttle valve operation amount 2
02, the servomotor 24 can be drive-controlled, and the opening degree of the throttle valve 26 is remotely controlled by the servomotor 24.

As described above, in the device of the present embodiment, the accelerator pedal 10 and the throttle valve 26 are not mechanically connected, and are calculated from the accelerator operation amount-throttle valve operation amount characteristic based on the depression amount of the accelerator pedal 10. The throttle valve 26 is remotely operated according to the throttle valve operation amount 202.

FIG. 3 shows the configuration of the mounting portion of the accelerator pedal 10, and the bracket 28 in the same figure is a floor 30 in front of the driver's seat.
It is installed upright.

An upper portion of the bracket 28 is rotatably supported by an intermediate portion of an accelerator lever 32 having a substantially V shape.

Further, the accelerator pedal 10 is fixed to the front end portion of the accelerator lever 32.

Further, a tension spring 34 is stretched between the rear end portion of the accelerator lever 32 and the floor 30.
The potentiometer 12 including a sliding resistor is mounted between the floor 2 and the floor 30.

An accelerator full-open switch 36 is mounted on the floor 30 on the front side of the bracket 28. The accelerator full-close switch 36 is not operated by depressing the accelerator pedal 10 and is pulled by a tension spring 34 to a limit position. When the vehicle is returned to the surroundings, it is driven on, and the non-operation state of the accelerator pedal 10 is detected.

Further, the switching signal 2 of the accelerator fully closed switch 36
04 is supplied to the microcomputer 16 of the control signal generator 14 as shown in FIG.

This microcomputer 16 detects the accelerator operation amount 2
It is possible to store a minimum value of 00.

Further, a plurality of detected accelerator operation amount-throttle valve operation amount characteristics are set in the memory, which are represented by characteristics A, B, C, D and E in FIG.

Further, a characteristic corresponding to the minimum value can be selected from these. Therefore, the microcomputer 16 can obtain the throttle valve operation amount 202 corresponding to the detected accelerator operation amount 200 from the selected characteristic.

The detection of the minimum value is ended when the non-operation state of the accelerator pedal 10 is detected by the switching signal 204.

Further, the microcomputer 16 detects the detected accelerator operation amount 200 (the output voltage of the potentiometer 12 is normally 0 V when there is no operation, so the detected accelerator operation amount 200 at this time is also referred to as an initial error hereinafter).
Can be held and stored, and the accelerator operation amount 200 can be calibrated by subtracting the stored and held initial error from the detected accelerator operation amount 200 after the non-operation state is detected.

Then, the detected accelerator operation amount 200 for which this calibration is performed
The throttle valve operation amount 202 corresponding to is calculated from the accelerator operation amount-throttle valve operation amount characteristic.

In the present embodiment, as understood from FIG. 2, a valve opening detection potentiometer 38 for detecting the opening of the throttle valve 26 by detecting the drive amount of the servo motor 24 is provided, and the detection signal thereof is the same. The feedback signal for controlling the opening is supplied to the microcomputer 16 via the A / D converter 40.

This embodiment has the above-mentioned structure, and its operation will be described below in the fourth embodiment.
It will be described with reference to the flowcharts of FIGS.

Here, the case where the accelerator pedal 10 is in the non-operation state and the case where the accelerator pedal 10 is in the operation state at the start of operation will be sequentially described.

First, a case where the accelerator pedal is in a non-operation state at the start of driving will be described.

The process of FIG. 4 is started at the time of starting the operation of the vehicle, that is, when the ignition switch is operated to the accessory position or the ON position, and the first step (300)
Then, it is determined whether or not a minimum value limit detection end flag, which will be described later, is set.

At the start of this operation, the minimum value limit detection end flag is not set, and therefore this step (30
In 0), a negative determination is made and the process proceeds to the first step (301) in FIG.

In steps (301) to (303), the minimum value Vmin of the detected accelerator operation amount 200 is stored. Since the minimum value Vmin is 1 volt or less when the accelerator pedal 10 is not operated, the process proceeds to step (305). .

In this step (305), the detected accelerator operation amount at that time is stored as the stored value ASSTUT, and then in step (306), the characteristic A shown in FIG. 8 is selected.

When the characteristic A is selected in this way, step (31
The process proceeds to 5), and in this step (315), it is determined whether or not a throttle storage flag described later is set. When the operation is started, the flag is not set, so that a negative determination is made in step (315) and the process proceeds to step (316).

In step (316), the throttle valve opening when the accelerator pedal 10 is not operated is a digital amount (AFBAD).
The throttle valve opening converted into a digital value is converted into a value AFBSU in the next step (317).
It is stored as T.

Then, in step (318), the above step (317)
The throttle storage flag indicating the end of the processing operation of is set, and the routine proceeds to step (319).

In this step (319), the accelerator fully closed switch 36
Is determined to be in the ON state. In this case, the accelerator pedal 10 is in the non-operated state, so a positive determination is made, and in the next step (320), the minimum value limit detection indicating the end is completed. The value limit detection end flag is set and the process proceeds to step (324) in FIG.

In this step (324), the potentiometer 12
The detected accelerator operation amount 200 detected in 1) and the valve opening of the throttle valve 26 detected by the valve opening detection potentiometer 38 are converted into digital values.

In the next step (326), the accelerator pedal 10
Detected accelerator operation amount 200 when no operation state is detected
(ASTSUT), detected throttle operation amount (AFBSU
T) is an initial error, and the accelerator pedal depression amount 200 (ASTAD) and throttle valve opening (AFB) after the detection are detected.
AD), which is used to calibrate the accelerator pedal depression amount and throttle valve opening.

Then, in step (328), the above step (326)
The throttle valve operation amount 202 corresponding to the accelerator pedal depression amount calibrated in (1) is searched from the accelerator operation amount-throttle valve operation amount characteristic on the memory table.

If the throttle valve operation amount 202 corresponding to the accelerator pedal depression amount is not stored in this table, interpolation processing is performed to obtain the throttle valve operation amount 202.

Further, in step (330), the above step (328)
The actual throttle valve opening corresponding to the throttle valve operation amount 202 which is the target value for the throttle valve opening control (the one that has been calibrated in step 326 A
The deviation (AST-AFB) of FB) is obtained, and in the final step (332), the throttle valve operation amount 202 having a value corresponding to this deviation is given to the motor drive 22 as the control target value Δθ.

Next, the operation of the apparatus of this embodiment performed according to the above processing will be described with reference to FIGS.

At the start of operation when the ignition switch is operated to the accessory position or the on position and the power supply voltage is supplied to the apparatus of this embodiment, the accelerator pedal 10 is generally not operated and the accelerator pedal 10 is not depressed. To be done.

When the accelerator pedal 10 is not depressed as described above, the accelerator full-close switch 36 is turned on as shown in FIGS. 6 and 7.

At this time, if there is an error in the attachment of the potentiometer 12 and the valve opening detection potentiometer 38, the sixth
As can be seen from FIGS. 7 and 7, although the accelerator pedal 10 is in the non-operated state, the initial errors x and y are generated in the potentiometer 12 and the valve opening detection potentiometer 38, respectively. ing.

These initial errors x and y are determined by the steps (30
3) and (317) are stored respectively for the calibration process in the step (326).

When these initial errors x and y are stored, the accelerator pedal depression amount and the throttle valve opening degree taken after that are calibrated by these (step 326), and the opening degree of the throttle valve 26 is controlled by them.

That is, by using the accelerator pedal depression amount (AST ^* ) calibrated in step (326), the accelerator operation amount-
From the throttle valve operation amount characteristic, the throttle valve operation amount (20
2 (AST) is obtained as the target value (step 32
8), the deviation (AST-AFB) of the throttle valve opening calibrated in step (326) from this target value is obtained, and the throttle valve operation amount 202 (Δ
θ) is supplied to the motor driver 22 and the throttle valve 2
6 is operated to the target opening position.

As described above, when the accelerator pedal 10 is not depressed at the start of operation, the operation position and the detected accelerator operation amount 200 are accurately corresponded, but the accelerator pedal 10 is not always operated at the start of operation. It is not a state.

Therefore, a case where the accelerator pedal 10 is operated at the start of operation (at the start of operation of the device) will be described next.

In this case, one of the five characteristics A to E corresponding to the learned minimum value Vmin of the accelerator operation amount is selected as described below, and the selected characteristics correspond to the preset allowable error. Amount of play (eg 0.5 ± 0.1V, below,
A calibration process of the detected accelerator operation amount is performed at the initial setting value) V ₀ , and this process is continued until the accelerator pedal 10 is in the non-operation state.

First, at the start of operation, the learning end flag is not set, and therefore the process proceeds from step (300) to step (301).

In steps (301) to (303), the minimum value of the detected accelerator operation amount 200 is stored.

First, in step (301), the detected accelerator operation amount 200 is converted into a digital amount AST and read.

In the next step (302), the detected accelerator operation amount 2
It is determined whether 00 is smaller than the minimum value Vmin.

When it is determined in step (302) that the detected accelerator operation amount 200 is smaller than the minimum value Vmin, this operation amount is stored as a new minimum value Vmin in the next step (303).

In steps (304) to (314), the minimum value Vmin
Any of the characteristics A to E corresponding to is selected.

That is, when the minimum value Vmin is Vmin <1, step (30
The process proceeds to step 5), the minimum value Vmin is stored, and the characteristic A is selected in the next step (306).

When the minimum value Vmin is between 1 and Vmin2, step (3
07), the initial setting value V ₀ is stored, and the characteristic B is selected in the next step (308).

When the minimum value Vmin is in the range of 2 ≦ Vmin <3, the process proceeds to step (309), the initial setting value V ₀ is stored, and the characteristic C is selected in the next step (310).

When the minimum value Vmin is 3 ≦ Vmin <4V, step (31
The process proceeds to 1), the initial setting value V ₀ is stored, and the characteristic D is selected in the next step (312).

When the minimum value Vmin is 4 ≦ Vmin, the routine proceeds to step (313), where the initial setting value V ₀ is stored and the characteristic E is selected at the next step (314).

In this way, the characteristic is selected, and the characteristic is utilized in the calculation of the target throttle valve opening in step (328).

Next, the operation of the apparatus of this embodiment performed according to the above processing will be described with reference to FIG.

When a detected accelerator operation amount 200, for example, 4V, which is an abnormal value at the start of operation, is output, as can be understood from the characteristic E, the engine has a constant rotation speed (for example, 20 when no load is applied).
00 rpm), and the accelerator pedal 10
Even if you step on, the engine speed will be constant and the engine will not overrun.

Further, when the accelerator pedal 10 is depressed at the start of operation and the characteristic E is selected, the detected accelerator operation amount 200 decreases when the depression amount is reduced, and the minimum value Vmin
Also decreases. Therefore, the characteristic shifts from E to D.

When the characteristic D is selected, the throttle valve is operated in the opening direction when the detected accelerator operation amount is stepped to 4V or more.

When the depression amount of the accelerator pedal 10 is further reduced, the characteristic shifts from D to C.

When the characteristic C is selected, the throttle valve is operated in the opening direction only when the detected accelerator operation amount 200 becomes 3 V or more. When the depression amount further decreases, the characteristic B is entered.

When this characteristic B is selected, the throttle valve is operated in the opening direction when the detected accelerator operation amount is 1 V or more.

When the accelerator pedal 10 is in the non-operated state, the characteristic shifts from B to A.

When the characteristic A is selected, the throttle valve 26 is not opened even if the accelerator pedal 10 is operated from its non-operated position to the position corresponding to the initial setting value V ₀ .

As described above, according to this embodiment, the deviation of the detected accelerator operation amount 200 at that time from the normal operation amount corresponding to the mechanically non-operated position of the accelerator pedal 10 is obtained, and the subsequent accelerator is calculated from the deviation. Pedal operation amount 20
Since the calibration for 0 is performed, the accelerator pedal 10
Even if there is a mounting error or a detection error in the potentiometer 12 that detects the stepping amount of those, those errors are automatically absorbed.

Therefore, the labor and time required for mounting the potentiometer 12 can be significantly reduced, and it is possible to use a sensor having a large detection error.

Further, even when the non-operation detection position of the accelerator pedal 10 becomes different due to aging, the detection error is similarly absorbed, and therefore the maintenance thereof becomes extremely easy.

Further, when the potentiometer 12 deteriorates and the detected accelerator operation amount 200 having an abnormal value is output at the time of starting the operation, it corresponds to the depression amount of the accelerator pedal 10 by the madder based on the detected accelerator operation amount 200. Since the throttle valve operation amount characteristic is selected and the throttle valve 26 is controlled to the opening position corresponding to the selected characteristic,
The engine is not accidentally laced, so there is no significant overrun burden on the engine.

Since the feed back amount of the throttle valve opening control is similarly calibrated, the accuracy of the valve opening control is improved.

When the accelerator fully closed switch 36 is turned on (step 311), the minimum value limit detection process (step 30
1-303), characteristic selection processing (steps 304-31)
4) and throttle storage processing (steps 315 to 31)
Since 8) is finished and only the flowchart of FIG. 4 is executed, the processing speed of the entire operation is increased and other processing can be performed in parallel.

In this embodiment, the minimum value Vmin detected so far is
Although the five characteristics A to E are set according to the above, it is not limited to this, and it is needless to say that the characteristics may be smaller or larger than these.

Further, since the characteristics are stored in a linear form, the memory capacity thereof can be reduced by performing interpolation processing, and a large number of characteristics can be stored.

<< Advantages of the Invention >> As described above, according to the present invention, the subsequent detected accelerator operation amount is calibrated based on the detected accelerator operation amount when the accelerator operator is in the mechanical non-operation position. Even if there is a mounting error or a detection error in the accelerator operation amount detection means for detecting the operation amount of the accelerator operator, those errors are automatically absorbed.

Therefore, the labor and time required for mounting the accelerator operation amount detecting means can be significantly reduced, and it is possible to use a device having a large detection error.

Further, even when the non-operation detection position of the accelerator operator is changed due to aging, the detection error is similarly absorbed, and therefore the maintenance thereof is extremely easy.

Further, when the accelerator operation amount detection means deteriorates and an abnormal detected accelerator operation amount is output at the time of starting the operation, it corresponds to the depression amount of the accelerator operator by the driver based on the detected accelerator operation amount. The throttle valve manipulated variable characteristic is selected and the throttle valve is controlled to the opening position corresponding to the selected (blown) characteristic, so the engine is not accidentally raced and therefore the overrun There is no heavy burden on the engine.

Further, the characteristic is converged to a characteristic (normal characteristic) based on the minimum value among a plurality of characteristics set in advance according to the minimum value.

[Brief description of drawings]

FIG. 1 is a diagram of the device according to the present invention corresponding to claims, FIG. 2 is a diagram illustrating a configuration of a first embodiment of the device according to the present invention, and FIG. 3 is a diagram illustrating a configuration of an accelerator pedal mounting portion, FIG. FIG. 5 is a flow chart for explaining the operation of the apparatus shown in FIG. 2, FIG. 6 is an explanatory view for calibrating the accelerator operation amount, FIG. 7 is an explanatory view for calibrating the throttle valve operation amount, and FIG. It is explanatory drawing which shows the characteristic characteristic of an Example. 100: accelerator operator 102: accelerator operation amount detecting means 104: minimum value learning means 105: characteristic setting means 106: characteristic selecting means 108: throttle valve operation amount calculating means 110: throttle valve operating means 112 ... Throttle valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F02D 45/00 345 F 7536-3G

Claims (1)

[Claims] 1. An accelerator operation amount detecting means for detecting an operation amount of an accelerator operator, and a characteristic setting means for setting a plurality of detected accelerator operation amount-throttle valve operation amount characteristics according to a minimum value of the accelerator operation amount. And a minimum value storage means for storing a minimum value of the detected accelerator operation amount from the start of operation, and a characteristic selection for selecting the accelerator operation amount-throttle valve operation amount characteristic corresponding to the minimum value of the detected accelerator operation amount. Means, a throttle valve operation amount calculating means for obtaining a throttle valve corresponding to the detected accelerator operation amount from the selected accelerator operation amount-throttle valve operation amount characteristic, and a slot valve obtained by the throttle valve operation amount calculating means A throttle valve remote control means for a vehicle, comprising: a throttle valve drive means for driving a throttle valve according to an operation amount.