JPH0427377B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a vehicle accelerator control device in which a throttle valve, which is mechanically disconnected from an accelerator operator, is controlled to open and close in response to the operation of the accelerator operator. It is.

<<Background of the Invention>> This type of device is known in Japanese Patent Application Laid-Open No. 59-58131, etc., and in order to improve the acceleration of a vehicle using the conventional device, the amount of opening of the throttle valve relative to the amount of operation of the accelerator operator is The increase was controlled.

However, in this case, the vehicle speed fluctuates greatly due to subtle accelerator work, making it difficult to drive the vehicle at a constant speed.

<<Object of the Invention>> The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide an accelerator control system that can easily maintain a constant vehicle speed even when the opening amount of the throttle valve is controlled to increase in response to accelerator work. The goal is to provide equipment.

<<Configuration of the Invention>> In order to achieve the above object, an apparatus according to the present invention is configured as shown in FIG.

In the figure, the operation amount of the accelerator operator is detected by the accelerator operation amount detection means a, and by monitoring the detected operation amount, the operation of the accelerator operator corresponding to constant speed driving of the vehicle is detected as the accelerator operation for constant speed driving. The operation is detected by means b as a constant speed driving operation.

In addition, the relative operation amount of the accelerator operator based on the detected operation amount of the accelerator operator at the time of detecting the constant speed driving operation is calculated by the relative accelerator operation amount calculation means C, and based on the relative operation amount, In a region where the value of the relative accelerator operation amount is small, the increase or decrease in the target throttle valve opening is small, and when the relative operation amount increases to a certain extent, the increase or decrease in the target throttle valve opening relative to this increases. The amount of change in the valve opening of the throttle valve is calculated based on the relative operation amount-throttle valve target opening characteristic, and the target opening is determined by the target opening calculation means d.

Further, the throttle valve is controlled to open and close to the target opening degree by the throttle valve opening and closing control means e.

<<Description of Embodiments>> Preferred embodiments of the apparatus according to the present invention will be described below based on the drawings.

The accelerator pedal 10 in Fig. 2 is the floor panel 1.
2, and a return spring 14
is biased counterclockwise in the figure.

The accelerator pedal 10 is depressed by the driver, and its depression amount (stroke l)
is detected by the accelerator potentiometer 16.

The throttle valve 18, which is mechanically disconnected from the accelerator pedal 10, is provided in a throttle chamber 20, and its rotating shaft 22 is biased in the closing direction by a return spring 26 via a lever 24. ing.

Furthermore, the opening and closing of the throttle valve 18 is driven by the motor 2.
8, and its opening degree is detected by a throttle potentiometer 29.

The detection signal of this potentiometer 29 and the detection signal of the potentiometer 16 are given to a processing circuit 34 via A/D converters 30 and 32, respectively, and the throttle valve opening/closing signal obtained by the processing circuit 34 is The control signal is provided to a motor driver 38 via a D/A converter 36.

The motor 28 is driven and controlled by the motor driver 38, and the throttle valve 18 is thereby controlled to open and close in response to the operation of the accelerator pedal 10.

Here, the processing circuit 34 is mainly composed of a microcomputer, and the operation of this embodiment will be explained below using the flowchart of FIG. 3 showing its processing procedure.

The process shown in the flowchart of FIG. 3 is activated at predetermined intervals by an operating system (not shown), and during the process, the accelerator pedal depression amount (l) is sampled.

First, the accelerator pedal depression amount that was sampled in the process two cycles ago and treated as the previous depression amount _l1 in the process one cycle ago is set as the previous depression amount _l2 (step 100), and also sampled in the process one cycle ago. The accelerator pedal depression amount, which was treated as the current depression amount _l0 , is set as the previous depression amount _l1 (step 102).

Then, the current accelerator pedal depression amount is sampled and read as the current depression amount _l0 (step 106).

Next, the amount of change in the amount of accelerator pedal depression (current amount of change) L ₀ from the time of processing one cycle ago is calculated by subtracting the previous amount of depression L ₁ that has also been set from the amount of current depression L ₀ that has already been set ( Step 108), and the previous depression amount that has already been set.
The amount of change (previous amount _of change) L ₁ in the amount of accelerator pedal depression from the time of processing two cycles ago to the time of processing one cycle ago is determined by subtracting the amount of depression L 2 from the previous time from l ₁ (step 110). ).

Further, when it is determined using these changes L ₀ and L ₁ that the accelerator pedal 10 is being operated in the depression direction continuously from the processing two cycles ago (affirmative determination in step 112, Step 11
4), or when it is subsequently determined that the return operation is in progress (negative determination in step 112, negative determination in step 116).
Then, the reference depression amount l ₀₀ is subtracted from the current depression amount l ₀ to determine the relative depression amount L of the accelerator pedal 10 with respect to the reference depression amount l ₀₀ (step 118).

Then, using this relative depression amount L, the valve opening change amount θθ corresponding to the relative depression amount L is determined from the cubic curve characteristic 200 (prepared in the form of a map) shown in FIG. 120), the valve opening degree change amount θθ is added to the previous valve opening degree target value _θ1 , thereby calculating the valve opening degree target value _θ0 of the throttle valve 18 (step 122).

Also, the upper limit value θh and lower limit value θl of this valve opening target value θ ₀
are determined from the characteristics 202h and 202l in FIG. 5 (steps 124 and 126), and the target valve opening value θ ₀ is compared with them (steps 128 and 13).
0).

At that time, if the valve opening target value θ ₀ exceeds the upper limit value θh (affirmative determination in step 128),
Alternatively, when the value is below the lower limit θl (affirmative determination in step 130), the valve opening target value _θ0 is limited to these values θh and θl (steps 132 and 13).
4) When the valve opening target value θ ₀ is between these values θh and θl, it is left unchanged (step 136).

When the target valve opening value θ ₀ of the throttle valve 12 is obtained in this way, the actual opening value θr of the throttle valve 18 is obtained.
is read (step 138), and the deviation ε of the actual valve opening θr from the target value θ ₀ of the valve opening is calculated (step 140).

Furthermore, using this control deviation ε, characteristic 2 in Fig. 6 is obtained.
04 (prepared in the form of a map) (step 142), and the valve opening control amount Δθ is given to the motor driver 38 via the D/A converter 36. (Step 14
4).

As a result, the opening degree of the throttle valve 18 is controlled in a direction that matches the valve opening degree target value θ ₀ .

As described above, when the accelerator pedal 10 is being operated continuously in the depressing direction or the returning direction, the vehicle is accelerating or decelerating and the driver has no intention of maintaining the speed of the vehicle constant. The throttle valve 18 is controlled to open or close by pressing or releasing the accelerator pedal 10, and the vehicle is accelerated or decelerated.

For this reason, for example, in FIG. 7, when the accelerator pedal 10 is continuously depressed from operating point A, the throttle valve is controlled to open according to characteristic 206 in the figure, and the vehicle is accelerated during that time.

Next, a case where accelerator work is performed to maintain the current vehicle speed will be explained.

In this embodiment, when the accelerator pedal 10 is operated to stop and maintained at that position (negative determination in step 112 in FIG. 3, affirmative determination in step 116), the operating direction of the accelerator pedal 10 is the depression direction. If there is a switch to the return direction (negative determination at step 112, positive determination at step 116), or vice versa (affirmative determination at step 112, negative determination at step 114) It is determined that a constant speed driving operation has been performed in which the accelerator pedal 10 is not being continuously operated in the depressing direction or the returning direction.

In those cases, the accelerator pedal depression amount at that time (previous depression amount l ₁ ) is set as the reference depression amount l ₀₀ (step 146).

Then, the valve opening target value θ ₀ corresponding to the reference depression amount l ₀₀ is set as the previous valve opening target value θ ₁ (step 104).

Then, in the processing from the next cycle onwards, the relative depression amount L to the accelerator pedal depression amount (l ₀₀ ) is calculated, so the depression amount (l ₀₀ )
The opening and closing of the throttle valve 18 is controlled based on the operation of the accelerator pedal 10.

Here, as can be understood from the above-mentioned FIG. 4, the characteristic 200 is a cubic curve, and therefore, in a region where the value of the relative depression amount L is small, the increase or decrease in the throttle valve opening relative to this is small. Moreover, when the relative depression amount L increases to a certain extent, the increase/decrease in the throttle valve opening relative to this increases.
Note that the same effect can be obtained even if the cubic characteristic is approximated by three straight lines, as shown by the dotted line in FIG.

Therefore, once the accelerator work for maintaining the vehicle speed is performed, the opening/closing control gain of the throttle valve opening is reduced in the region where the value of the relative depression amount L is small, so that the accelerator pedal 10 is kept at a substantially constant position. If the vehicle speed is maintained at a constant value, excessive fluctuations in vehicle speed are prevented, and therefore the vehicle speed is maintained constant.

Even in this case, when the accelerator pedal 10 is operated beyond a certain level, the throttle valve 18 is opened and closed to a large extent, so that sufficient acceleration and deceleration force of the vehicle can be obtained.

For example, in FIG. 7, when the vehicle is accelerated to the operating point B and the accelerator is operated to maintain the vehicle speed, the characteristic 20 centered around the stable operating point B.
8, the throttle valve 18 is controlled to open and close, thereby making it possible to sufficiently accelerate the vehicle.
It is also possible to maintain the vehicle speed at that time.

As explained above, according to this embodiment, the opening/closing control gain of the throttle valve 18 in response to the operation of the accelerator pedal 10 is suppressed when accelerator work for maintaining vehicle speed is detected, so that the vehicle speed can be increased while ensuring good vehicle acceleration performance. can be maintained constant.

<<Effects of the Invention>> As described above, according to the present invention, it is possible to easily maintain a constant vehicle speed even when the engine output is controlled to change significantly in response to accelerator work.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to the claims, FIG. 2 is a configuration explanatory diagram of a preferred embodiment of the device according to the present invention, FIG. 3 is a flowchart explaining the operation of the embodiment in FIG. 2, and FIGS. 6 and 7 are characteristic diagrams for explaining the operation of the embodiment in FIG. 2. a...Accelerator operation amount detection means, b...Accelerator operation detection means for constant speed driving, c...Relative accelerator operation amount calculation means, d...Target opening degree calculation means, e...
... Throttle valve opening/closing control means, 10... Accelerator pedal, 16... Potentiometer, 18... Throttle valve, 28... Motor, 30... Potentiometer, 34... Processing circuit, 38... Motor driver.

Claims (1)

[Scope of Claims] 1. Accelerator operation amount detection means for detecting the operation amount of the accelerator operator; Accelerator operation detection means for constant speed driving that detects the operation of the accelerator operator for constant speed driving by monitoring the detected operation amount; , a relative accelerator operation amount calculating means for calculating a relative operation amount of an accelerator operator based on the detected operation amount when detecting an operation for constant speed running, and a throttle valve corresponding to the relative accelerator operation amount in a region where the value of the relative accelerator operation amount is small. The accelerator is adjusted according to the cubic relative operation amount-throttle valve target opening characteristic such that when the increase or decrease in the target opening is small and the relative accelerator operation amount increases to a certain extent, the increase or decrease in the throttle valve target opening increases. Target opening calculating means for calculating the amount of change in valve opening of the throttle valve based on the relative operation amount of the operator to obtain a target opening; Throttle valve opening/closing control means for controlling the opening of the throttle valve to the target opening. An accelerator control device comprising: