JPS6220725A - Accelerator controller for vehicle - Google Patents

Abstract

PURPOSE:To maintain the speed of a vehicle constant by controlling the opening of a throttle valve on the basis of target opening calculation characteristic and the relative operation of an accelerator operating chip selected in correspondence with the operating condition of the vehicle. CONSTITUTION:The operating amount of an accelerator operating chip is detected through a detecting means (a) then said amount is monitored to detect the operation of the accelerator operating chip in corresponding with constant speed travel through detecting means (b). The relative operating amount with reference to the detected operating amount is obtained through an operating means (c). Target opening calculation characteristic employing said relative operating amount as a variable has been set through a setting means (d) to detect the operating condition through a detecting means (e). Target opening calculation characteristic is selected on the basis of the detected operating condition. On the basis of the selected characteristic and the relative operating amount, target opening is obtained through an operating means (g) to control the throttle valve to the target level through a control means (h) turns to maintain the vehicle speed constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to an accelerator control device for a vehicle in which a throttle valve, which is mechanically disconnected from the 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. In the conventional device, in order to improve the acceleration of the vehicle, the opening of the throttle valve is adjusted according to the operation amount of the accelerator operator. The group was being controlled to grow.

However, in this conventional device, the vehicle speed fluctuates greatly due to subtle accelerator work, so there is a problem in that it is 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 purpose is to be able to increase control of the opening of the throttle valve in response to accelerator operation, and to maintain a constant vehicle speed. An object of the present invention is to provide an accelerator control device for a vehicle.

(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 port 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 as a constant speed driving operation.

Further, the relative operation amount of the accelerator operator is calculated by the relative accelerator operation amount calculating means C based on the detected operation amount of the accelerator operator at the time of detecting the constant speed driving operation.

Furthermore, a cubic curve target opening calculation characteristic in which the relative operation opening of the accelerator operator is used as a variable is set by characteristic setting means d, and detection regarding the driving state of the vehicle is detected by driving state detecting means e. There is.

When the constant speed driving operation of the accelerator operator is detected, one of the target opening degree calculation characteristics is selected by the characteristic selection means f depending on the driving state detected by the driving state detecting means C.

The target opening degree of the throttle valve is determined by the target opening calculation means q using the selection characteristics and the relative operation amount of the accelerator operator, and the throttle valve opening/opening control means adjusts the throttle valve to the target opening degree. The opening degree of the valve is controlled.

Note that the detection related to the driving state of the vehicle includes, for example, the detection of the vehicle speed, the detection of the gear ratio of the transmission, the detection of whether the clutch is disengaged, and the detection of whether the transmission is set to neutral. It is also possible to do this by combining them, roughly as if the clutch were disengaged and the transmission was in neutral.

(Description of Embodiments) Hereinafter, preferred embodiments of the apparatus according to the present invention will be described based on the drawings.

The accelerator pedal 10 in FIG. 2 is pivotally supported on a floor panel 12, and is biased counterclockwise in the figure by a return spring 14.

The accelerator pedal 10 is depressed by the driver, and the pedal stroke is detected by the accelerator potentiometer 16.

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

Further, the throttle valve 18 is driven to open and close by a motor 28, and its opening degree is detected by a throttle potentiometer 30.

The detection signal of this potentiometer 30 and the detection signal of the potentiometer 16 are given to the processing circuit 34 via A/D converters 30 and 32, respectively.
The throttle valve opening/closing control signal obtained is sent to the D/A converter 3.
6 to the motor driver 38.

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

In this embodiment, the driving state of the vehicle is detected by detecting the vehicle speed, and a detection signal from the vehicle speed sensor 40 that performs this detection is supplied to the processing circuit 34.

The above-mentioned processing circuit 34 is mainly composed of a microcomputer, and the processing procedure thereof will be shown in the third section below.
The operation of this embodiment will be explained using the flowchart shown in the figure.

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

First, it was sampled in the process two cycles ago, and the previous depression amount was sampled in the process one cycle ago! ! The accelerator pedal depression amount handled as , , is set as the previous depression 16 (step 100), and is also sampled in the process one cycle before to become the current depression amount! The accelerator pedal depression amount treated as o is the previous depression amount! 1 (step 102).

And the current amount of accelerator pedal depression is this time K1
1o sampled and read (step 10
6), The amount of pressure this time! The amount of change (current amount of change) Lo in the amount of accelerator pedal depression from the time of processing one cycle before is calculated by subtracting the previous depression 1 from o (step 108).

Last time I stepped in again! ! , + is the amount of pressure from the previous time! 2
By subtracting , the maximum amount of change in the accelerator pedal depression (previous amount of change [1) that changed from the time of processing two cycles ago to the time of processing one cycle ago is determined (step 110).
.

Roughly using these changes Lo and L+, when it is determined that the accelerator pedal 10 is being operated in the depression direction continuously from the time of processing two cycles ago (affirmative determination in step 112, step 1] 4), or when it is subsequently determined that the return operation is in progress (negative determination in step 112, negative determination in step 116), the current depression amount i! , standard stepping i from o
, go.

is subtracted to determine the relative depression of the accelerator pedal 10 with respect to the reference depression i, eoo (step 118).

Then, using this relative depression ML from any of the 200 groups of cubic map characteristics shown in Fig. 4, the relative depression fJ
The valve opening change amount θθ corresponding to L is determined (step 1
20>, the target opening degree θ0 of the throttle valve 18 is calculated by adding the valve opening degree change amount θθ to the previous valve opening degree target value θ described above (step 122).

Also, the upper limit value θh and lower limit value θl of this target opening degree θa are the fifth
Characteristics 202h, 202. g (steps 124, 126) and the target opening degree θ0 is compared with them (steps 128, 130).

In this case, if the target opening degree θQ exceeds the upper limit value θh (affirmative determination in step 128) or is below the lower limit value θl (affirmative determination in step 130), the target opening degree θ0 are those values θh, θ! (Steps 132 and 134), and when the target opening degree θ0 is between these values θh and θβ, it is left unchanged (Step 136).

In this way, the target opening degree θ of the throttle valve 12 is determined. When obtained, the actual opening degree θr of the throttle valve "8" is read (
Step 138>, the deviation ε of the actual opening degree θ with respect to the target opening degree θ0 is calculated (step 140).

Furthermore, using this opening deviation ε, the map characteristic 20 shown in FIG.
4, the valve opening control amount Δθ is determined (step 142).
, a throttle valve opening/closing control signal corresponding to the valve opening control amount Δθ is sent to the motor driver 38 via the D/A converter 36.
(step 144).

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

As described above, when the accelerator pedal 10 is continuously operated in the depressing direction or the returning direction, the driver must have the intention to maintain the speed of the vehicle constant while the vehicle is accelerating or decelerating. 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.

Therefore, in FIG. 7, when the accelerator pedal 10 is continuously depressed from the operating point, the characteristic 20 in the same figure
6, the throttle valve 18 is controlled to open, and the vehicle is accelerated during this period.

Next, a case will be described in which a constant speed driving accelerator operation is performed to maintain the current vehicle speed.

In this embodiment, when the accelerator pedal 10 is operated to stop from the time before the previous processing and is maintained at that position (see FIG.
(negative determination in step 112, positive determination in step 116), if the operating direction of the accelerator pedal 10 switches from the depression direction to the return direction (step 11
2: positive determination, step 114: negative determination),
When the switching is reversed (negative determination in step 112, affirmative determination in step 116), it is determined that the accelerator operation for constant speed driving has been performed.

In those cases, the amount of accelerator pedal depression at that time (
The current depression amount (fo) is set as the reference depression amount 1oo, and the target opening degree θ0 obtained in the process one cycle before is set as the sprouting target opening degree θ1 (step 146).

And this time it's the stepping group! . From that reference depth m, eo
When the relative depression ff1L is obtained by subtracting o (step 148), the vehicle speed detected by the vehicle speed sensor 40 in FIG. 2 is read (step 15O).

Roughly using the vehicle speed, one of the characteristics is selected from the characteristic group 200 in FIG. 4 (step 152), and at this time, a characteristic whose gradient increases as the vehicle speed increases is selected.

Then, using the relative depression aL at that time, the valve opening change amount θ
θ is determined (step 154), and then the throttle valve 18 is controlled to open and close to the target opening θ0 using this valve opening change amount θθ (steps 122 to 144).

When the accelerator pedal for constant speed running is pressed as described above, the relative depression amount becomes O at that time, so the throttle valve 18 is temporarily stopped.

In the subsequent processing, the relative depression ff1L to the accelerator pedal depression 1 (foo) is determined, so the throttle valve 18 is controlled to open and close around the depression ff1 (, 5oo) in accordance with the operation of the accelerator pedal 10. Ru.

In this case, as can be understood from the above-mentioned Fig. 4, each characteristic of the 200 characteristic groups is cubic curve-like, and therefore, in the region where the value of the above-mentioned relative depression amount H is small, the throttle valve opening is adjusted accordingly. If the increase or decrease is small and the relative depression iL increases to a certain extent, the increase or decrease in the throttle valve opening relative to this increases.

Therefore, in a region where the value of relative depression IL is small, the opening/closing control gain of the throttle valve opening is reduced, and as a result, the accelerator pedal 10 is held at a substantially constant position.
Sensitive fluctuations in vehicle speed are prevented, and as a result, 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 for constant speed driving, the throttle valve 18 is controlled to open and close according to the characteristic 208 centered on the stable operating point B. While it is possible to sufficiently accelerate and decelerate the vehicle, it is also possible to maintain the vehicle speed at that time.

In this embodiment, a characteristic in which the amount of change in the amount of change in the valve opening degree θθ increases with respect to the relative depression iL as the vehicle speed increases is selected from the characteristic group 200, and the amount of change in the valve opening degree θθ is determined from the characteristic. Therefore, it is possible to perform even better acceleration and deceleration of the vehicle when driving at high speed.

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 constant speed driving is detected.
Good acceleration/deceleration performance of the vehicle can be ensured, and it is also possible to maintain a constant vehicle speed.

According to this embodiment, as the vehicle speed increases, the acceleration/deceleration performance of the vehicle is improved by the selection of the characteristics described above, so that the accelerator feeling when the vehicle is driven at high speeds is greatly enhanced.

(Effects of the Invention) As explained above, according to the present invention, it is possible to obtain sufficient vehicle acceleration/deceleration force while maintaining a constant vehicle speed, and to perform appropriate engine control according to the driving condition of the vehicle. becomes possible.

[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 shown in Fig. 2, Figs. , FIG. 6, and FIG. 7 are characteristic diagrams for explaining the operation of the embodiment shown in FIG. a-... Accelerator operation amount detection means b...
Constant speed driving accelerator operation detection means C...Relative accelerator operation amount calculation means d...Characteristic setting means e...Driving state detection means f...Characteristics Selection means 9... Target opening calculation means h... Throttle valve opening/closing control means 10... Accelerator pedal 16... Potentiometer 18... Throttle valve 28... Motor 30. ...Potentiometer 34...Processing circuit 38...Motor driver 40...Vehicle speed sensor Fig. 1 (Nukuguchi, V) - JLJ) Fig. 2 40 (!J* Seshio Fig. 4 Fig. 5 6″Figure 7

Claims (1)

[Claims] (1) An accelerator operation amount detection means for detecting the operation amount of the accelerator operator; an accelerator operation detection means for constant speed driving that detects an operation of the accelerator operator for constant speed driving by monitoring the detected operation amount; and constant speed driving. a relative accelerator operation amount calculation means for calculating a relative operation amount of an accelerator operator based on the detected operation amount at the time of detecting an operation; and a plurality of cubic curve targets in which the relative operation amount of the accelerator operator is used as a variable. a characteristic setting means in which an opening degree calculation characteristic is set; a driving state detecting means for detecting the driving state of the vehicle; and a driving state detecting means for detecting the driving state of the vehicle; a characteristic selection means for selecting a calculation characteristic; a target opening calculation means for calculating a target opening of the throttle valve using the selected target opening calculation characteristic and the relative operation amount of the accelerator operator; An accelerator control device for a vehicle, comprising: a throttle valve opening/closing control means for controlling the opening to a target opening.