JPS60206949A - Vehicle accelerator control device - Google Patents

Abstract

PURPOSE:To enhance the responsiveness of an engine upon abrupt acceleration, with the use of an accelerator control system in which a throttle valve is remotely controlled by means of a servo-system, by determining a desired value of throttle valve opening degree in accordance with the opening degree of the throttle valve and the increment of the throttle valve opening degree which correspond respectively to the operated amount and operating speed of an accelerator operating element. CONSTITUTION:There are provided an operated amount detecting means (a) for detecting the operated amount (l) of an accelerator operating element (b) and an operating speed detecting means (c) for detecting the operating speed DELTAl/DELTAt of the operating element (b), and the outputs thereof are delivered to a desired value converting means (d) in which a first characteristic giving the relationship between the operated amount and the throttle valve opening degree (theta) and a second characteristic giving the relationship between the operating speed DELTAl/DELTAt and the increment DELTAtheta of the throttle valve opening degree are set. Further, a throttle valve opening degree (theta) and an increment DELTAtheta of the throttle opening degree which correspond to the operated amount (l) and the operating speed DELTAl/DELTAt which are detected, and the sum of both values is issued as a desired value of throttle valve opening degree. A servo drive means (e) for a throttle valve (f) is controlled in accordance with this desired value.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention mechanically separates the accelerator operator and the throttle valve, and remotely controls the thrower I/LE valve via a servo system. This invention relates to a vehicle accelerator IT/11 control device.

(Prior art and its problems) Conventionally, as a vehicle accelerator control device in which an accelerator operator and a throttle valve are mechanically separated and the throttle valve is remotely controlled, for example, Japanese Patent Publication No. 58 258
53M publication is known, but in this one,
The throttle opening degree is simply controlled in a proportional manner in response to the amount of operation of the accelerator operator, and this poses problems such as difficulty in speed control during sudden acceleration or deceleration.

(Object of the Invention) An object of the present invention is to improve responsiveness during sudden acceleration or deceleration in a vehicle accelerator control device using this type of servo system.

(Configuration of the Invention) The configuration of the device of the present invention will be described with reference to the claim correspondence diagram in FIG.

Operation [j The detection means a detects the operation G (
Detect.

The operation speed detection means C detects the operation speed of the accelerator operator.

1" IIfJ conversion means d has a first characteristic that determines the relationship between the operation m° C. and the throttle 17i1 pawl θ, and a first characteristic that determines the relationship between the operation speed Δ2/Δt and the throttle valve distance increment. 2 characteristics are set, and considering the throttle opening θJjJ: and the throttle opening increment Δθ corresponding to the detected operation m℃ and operation speed Δ17/ΔE, respectively, The sum is output as the throttle opening target value.

The servo driving means e moves the throttle valve [rll!] so that the target throttle opening degree 1 and the actual throttle opening degree match. I control zuru.

(Explanation of Examples) FIG. 2 shows the hardware configuration of the device of the present invention.

In the figure, the pedal body 1 outputs an analog voltage signal APS corresponding to the operation ffi of the nonoxel valve.

The differentiating circuit 2 differentiates the )L number ΔPS to obtain an analog voltage signal D corresponding to the operating speed of the accelerator pedal.
Output ΔPS.

These signals APS and DAPS are taken into the microcomputer 4 through A/D conversion.

The microcomputer 4 outputs a throttle distance target value signal θ via the D/A converter 5.

The servo drive circuit 6 detects that the actual throttle opening value detected via the throttle potentiometer 7 matches the throttle opening target value given from the microcontroller 4 via the D/A converter 5. so that the servo motor 8
The opening and closing of the throttle valve 9 is controlled via the throttle valve 9.

FIG. 3 is a flowchart showing details of the system program executed by the microcomputer 4.

In the figure, when the program starts, initialization processing is first performed, and then the accelerator pedal operation ff1APs and the operation speed DAPS/fi are read (
Steps 100, 101).

Next, if the depression speed UDAPS is positive (including O),
It is determined that the accelerator pedal is depressed, and if the external force is negative, the accelerator pedal is returned and determined to be depressed (
Step 102).

If it is determined that the accelerator pedal is depressed, then the process of step (103) is executed.

In other words, IJ4 is stored in the memory of Microphone Computer 4.
As shown in the figure, there is a lack of accelerator pedal depression and L (Thursday 1).
] The first characteristic that determines the relationship between the throttle valve opening θ and the accelerator pedal depression force speed Δdeficiency/Δt
and the increment of throttle valve opening 〇 Determine which relationship is the second
The properties of -C are stored in the form of a function table.

Therefore, in the characteristics shown in FIG. 4, in order to easily make fine speed adjustments, the rate of change in throttle opening corresponding to λ·1 of the amount of depression of the accelerator pedal is set to be small.

In addition, the characteristic shown in Fig. 5 is a characteristic in which the throttle valve opening becomes larger when the accelerator pedal is suddenly depressed to achieve a large acceleration, that is, the accelerator pedal depression speed Δl/Δt Increment Δ of throttle valve opening
It is set so that θ is in a proportional relationship.

The microcomputer utilizes the above function table and circles the basic throttle valve opening θ and the increment of the throttle valve opening by a table lookup method using APS and DAPS as direct or indirect arguments, respectively.

J), a well-known interpolation scheme is performed during this table lookup.

Next, the requested basic thrower valve opening degree θ and the throttle valve opening degree increment Δθ are added together to determine the throttle opening degree target value θ (step 104).

θ-θ+Δθ On the other hand, if it is determined in step (102) that the accelerator pedal has been released, the process in step (105) is executed.

In this process, in accordance with the characteristics shown in FIG. 4, only the basic thrower 1 health JPIit 1 degree .theta. is measured, and the complementary meter Q is similarly set to 1.

Next, the requested basic throttle valve opening θ is used as the throttle valve opening target value (step 10G).
〉.

Then step (104) or step (106)
The set throttle valve f7F] degree target value e is D7/
It is supplied to the servo drive circuit 6 via the Δ converter 5, and
The throttle valve 9 is controlled to [1 degree] via the nervo motor 8.

According to the above control, as shown in FIG.
The distance up to + is constant ffJI! +, and if an accelerator operation is performed in which the amount of depression increases rapidly from time 11 to [2, and after 11) time 12, the depression m is a constant value of 2, as shown in Fig. 7, time 11 to 1
2, the depression speed curve is trfed.

Here, as mentioned above, a proportional relationship is set between the depression speed Δl/Δt and the throttle opening increment Δθ.
As shown in FIG. 8, when the basic throttle valve opening θ and the increment Δθ of the throttle 61 degrees are increased or decreased by the process of step (103) described above, the throttle valve opening degree θ is increased or decreased. When the degree Lltri value θ is 1ho1, only while the accelerator pedal depression amount increases from 1lIl) to 1.2, a sharp upper back curve is drawn and the vehicle is accelerated to zero.

On the other hand, if the accelerator pedal is returned and pressed, the throttle opening is not incremented in the negative direction by the process of step (105), so the basic step shown in FIG. ] The deceleration operation will be performed according to the throttle valve opening characteristics.

In the above embodiment, the differential circuit 2' detects the depression speed of the c pedal, but the r-APS in the microcomputer 3 is
It goes without saying that it may be differentiated in terms of −.

Moreover, it is of course possible to add 0 to θ depending on the return speed of the accelerator pedal.

(Effects of the Invention) As is clear from the explanation of the above 7i:
For 1-, C follows the amount of depression of the accelerator pedal.
S1: It is possible to control the distance between the valves, and when a sudden depression operation is performed, it is possible to control the stroke valve by following the depression speed.
'i I: It is possible to improve acceleration and deceleration performance.

[Brief explanation of the drawing]

FIG. 1 is a claim correspondence diagram of the present invention, FIG. 2 is a block diagram showing the hardware configuration of the present invention, FIG. 3 is a flow diagram showing the system program III of the present invention, and FIG. Figure 15 is a graph showing the basic throttle valve opening characteristic, Figure 6 is a graph showing the incremental characteristic of throttle valve opening, and Figure 6 is an example of accelerator pedal depression 1'1 /J% J graph. Figure 7 corresponds to the operation in Figure 6. 1! '?
A graph showing the relationship between the pedaling speed and Fig. ε3 is Wi
It is a graph showing 1 mark 11/I for the thrower valve opening degree in 'f included J no Ik' + J3 J: return I). a... 1 to 6 operation is detection means b... accelerator operator C... operation speed detection means d... target value conversion means e... servo drive means f... Bentokuff Applicant: Nissan Motor Co., Ltd. Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure II (Notification of Compliance)

Claims (1)

[Claims] (1) Operation amount detection means for detecting the operation ■ of the accelerator operation; Operation stray electricity detection means for detecting the operation speed of the accelerator operation; A first characteristic that determines the relationship with the opening degree and a second characteristic that determines the relationship between the operation speed and the throttle valve rti 1 degree increment are set, and the detected operation fi (15 and Operation 1'l'
Determine the throttle opening J3 and the increment of the throttle opening corresponding to i1 degree, and calculate the sum of both as the throttle opening J3 and the throttle opening increment.
11 target value converting means for outputting as a vote value; II! characterized by comprising a driving means! Dual-purpose accelerator control device.