JPS60198342A - Car accelerator controller - Google Patents

Abstract

PURPOSE:To achieve good acceleration feeling while to facilitate the fine speed regulation by selecting a characteristic suitable to the operating condition from the accelerator operating speed including the full-close of accelerator automatically then controlling the throttle valve opening automatically in accordance with said characteristic. CONSTITUTION:Accelerator operating amount detecting means A for detecting the operating amount of an accelerator member is provided to detect the accelerator operating speed through detecting means B on the basis of the output signal from said means A. Then it is compared with predetermined referential level in comparing means C to select specific function characteristic from memory means D storing the function characteristic between the accelerator member operating amount and the throttle valve opening through function characteristic selection means E in accordance with the comparison results. Here, the basic function characteristic is selected under full-close of accelerator. Then, in accordance with said function characteristic, the throttle opening corresponding with said operating amount is set through setting means F to open/close the throttle valve through throttle valve drive mechanism G while targeting the setting opening of throttle valve.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention makes it possible to obtain the engine throttle valve opening given in response to the driver's accelerator operation based on the functional characteristics depending on the operating state. The present invention relates to a vehicle accelerator control device.

Prior Art For example, the throttle valve of an internal combustion engine installed in a car is generally connected to the accelerator pedal via a wire mechanism.
), the opening degree of the throttle valve is fixedly determined. In other words,
When the accelerator operation amount is changed, the throttle valve opening will change according to a certain proportional characteristic determined by the coupling mechanism between the two, and the difference between the operation amount and the throttle valve opening will change. Functional relationships remain unchanged.

Here, how to set the above characteristics depends on the driving feeling when the car is driven by a human, such as the feeling of acceleration, ease of driving at low speeds in urban areas, or the level of fatigue associated with accelerator operation. If you select a characteristic that directly affects the size, for example, the throttle valve opening changes greatly depending on the amount of accelerator pedal operation, you will experience a good acceleration feeling, but it will also be difficult to drive at low speeds in the city. At times, extremely delicate accelerator operations are required, making driving difficult and tiring.

On the other hand, without going through the wire mechanism as mentioned above, the operating amount of the accelerator pedal is once converted into an electrical signal, and the servo motor is configured to drive the engine throttle valve according to the output. A valve control device is described in JP-A-51-188285, but this device can only accurately transmit the amount of operation of the accelerator pedal as the throttle valve opening, and the driver's unconscious It is not possible to naturally enhance the sense of acceleration during a normal operation, or to switch to a characteristic that is easy to make minute adjustments.

Purpose of the Invention This invention provides that when a driver desires a feeling of acceleration, the driver suddenly depresses the accelerator pedal unconsciously, and conversely, in situations where minute speed adjustments are required, such as when driving at low speeds, the driver depresses the accelerator pedal unconsciously. It was developed by focusing on the fact that the accelerator is operated slowly, and automatically selects the characteristics suitable for the situation based on the accelerator operating speed, eliminating the need for manual switching and eliminating discomfort during use. The objective is to improve the driving feeling by achieving both a sense of acceleration and ease of fine speed adjustment without causing any friction.

Summary of the Invention As shown in FIG. 1, the vehicle accelerator control device according to the present invention includes an accelerator operation amount detection means A that detects the operation amount of an accelerator member such as an accelerator pedal, and an accelerator operation amount detection means A that detects the operation amount of an accelerator member such as an accelerator pedal. an accelerator operation speed detection means B for detecting the accelerator operation speed; a comparison means C for comparing the accelerator operation speed with a predetermined reference value; and a memory storing a plurality of functional characteristics between the operation amount and the engine throttle valve opening. The function characteristics are sequentially selected in a predetermined order from among the plurality of stored function characteristics based on the determination result of the comparison means 0, and the accelerator operation precision detection means A outputs accelerator fully closed No. 1N. a function characteristic selection means E for selecting a basic function characteristic; a throttle valve opening setting method F for setting a throttle valve opening corresponding to the manipulated variable in accordance with the selected function characteristic; A throttle valve drive mechanism G that opens and closes the throttle valve with the target opening degree of the throttle valve set as a target, and a function characteristic emphasizing the sense of acceleration and ease of fine adjustment. As a result of sequentially selecting function characteristics suitable for the situation from among multiple characteristics, driving feeling such as acceleration feeling is improved, and furthermore, by returning to the basic function characteristics when the accelerator is fully opened, the feeling of discomfort is reduced. It is possible to drive naturally.

Embodiment FIG. 2 is a diagram showing an embodiment of the hardware configuration of the present invention, in which a potentiometer or the like is used to detect the amount of operation (depression amount) of the accelerator pedal operated by the driver. A stroke sensor 1 is provided so that an accelerator operation amount signal AP corresponding to the operation amount is read into the microcomputer 3 via an A/D converter λ. Further, the accelerator operation signal AP8 is differentiated by a differentiating circuit≠, and is similarly input as the accelerator operation speed DAP8 through the Φ converter 2t-. The microcomputer 3 determines the target opening degree of the engine throttle valve based on the operation amount signal APE and the operation speed signal DAPH in accordance with a program to be described later. The signal corresponding to this target opening is input to the servo drive circuit B via the gearbox S, and the servo drive circuit t compares the actual throttle valve opening detected by the throttle valve opening sensor 7 with the above-mentioned target. The servo motor ♂ is driven in forward and reverse directions according to the deviation from the opening, thereby making the throttle valve opening follow the target value.

Here, the target throttle valve opening degree is set in advance as an accelerator operation t1S AP8t-manual variable in accordance with a predetermined function characteristic, and is stored in the memory of the microcomputer 3 in the form of a function table. . A plurality of functional characteristics are set between the accelerator operation amount and the throttle valve opening, and specifically, three types of characteristics MOD/ as shown in the iJB diagram are set.

MODJ, MOD,? A function table corresponding to each is stored. Upper dpi characteristics MOD/-MOD,? , the throttle valve opening change rate in the low and medium load range is small.

The intermediate characteristic MODλ is selected as a characteristic that changes linearly from fully closed to fully open the throttle valve, similar to the connection by a wire mechanism. On the other hand, the characteristic MOD/ has a characteristic that the rate of change in the opening degree of the throttle valve is small in the low-medium load range, and therefore it is easy to make fine adjustments to the speed. Also, on the contrary, characteristic MOD,? The throttle valve opening has a large rate of change in the low to medium load range, and therefore has the characteristic of providing a good sense of acceleration.

Next, FIG. 4 is a flowchart showing the processing procedure for determining the throttle valve target opening degree based on the above-mentioned operation amount signal APE and operation speed signal DAP8.

To explain this in full detail, first (in step 1 of the AJ diagram, set the memory FMOI to t-/ so that the special @moDi is selected first, etc.P) initialize f. conduct. Note that the memo IJFMOD determines which of the three functional characteristics to select.
If the characteristic MOD / is FMOD-2, then the characteristic MO
If the DJ is FMOD course 3, characteristic MOD3 is selected.

In step λ, the accelerator operation amount signal APS and the accelerator operation speed signal DAP8 are read.

In step 3, the currently selected function characteristic is
/ is determined, and if NO, proceed to step 14'; if YIB, proceed to step S. In Step S and Step 6, it is determined whether the operating speed signal DAPS exceeds the reference value t+l or L2c (L/〉h2)t-, and if it exceeds the reference value L/, the characteristic MOD, ? ′
If fc exceeds the reference value J, 2'ii, the characteristic MODJ
In step 7, set the memory FMOD to select 'i. -Also, if the reference value L2f is not exceeded, the memory FMOD-/ is maintained. In step l above, it is determined whether the currently selected function characteristic is MOD, 2, and if NO, memory FMOD=,? Keep it Yl! ! If S, operation speed signal DAP8 with stepta
is the reference value L3 (however: t, /) L, y): c, λ) t
- Determine whether it has been exceeded.

If the reference value I, j'i is exceeded, the memory IJ FMODfi:l'-3J is set in step 10, and if it is not exceeded, the memory FMOD--2 is maintained.

In step 1/, it is determined whether the accelerator pedal operation phase is zero, that is, in a fully closed state. If YES)8, the step saw sets the memory FMopi"/J; if NO, the process directly proceeds to step 13. It is now determined which function characteristic to select, and the result is shown in the memory FMOD.

In steps 13 and /4C, the contents of memory FMOD are determined, and if memory FMOD=/, step ts
``'cvji, lIMODGcW characteristic MOD/'i, memory FMOD-2, register MODK characteristic MODJ'i in step 16, otherwise register MOD'f in step 17.

Functional characteristics are selected through the above procedure. Next, read the accelerator operation amount No. 16 APS in step 2/ of the diagram (B), and in step n, select the characteristic MOD selected as above.
The accelerator operation Jl signal ip read by using any function table of /~MODE and by interpolation calculation.
The throttle valve opening target value corresponding to s is determined, and the target value is outputted to the servo drive circuit t using the subsequent step force.

FIG. 5 shows an example of a specific running f-te pattern, with an accelerator operation amount signal AP and an accelerator operation speed signal DAPS.
, characteristic MOD/~MOD, 7. Next, based on this, the operation of this embodiment will be explained.

First, when starting from a fully closed accelerator state, characteristic MOD/ is selected. The characteristic MOD, / is necessary because it is easy to finely adjust the speed, and it makes driving easier, for example, when driving in traffic jams, and reduces fatigue. From this state, it accelerates relatively slowly,
When the manipulated variable signal DAl'll exceeds the reference value L2 at T, the characteristic MOD is selected, allowing normal or slightly better driving with a good sense of acceleration. For example, L2 is 1.2% opening/
l Omg.

While driving with the characteristic MODJ, if the operation speed summer signal DAPS completely exceeds the reference value L3 at T, the characteristic M
ODE is selected, resulting in a driving experience with a very good sense of acceleration. IJ3 is set to, for example, 2.4% opening/1 (jmB).

Thereafter, when the accelerator pedal is released and the accelerator is fully closed at T8, the function characteristic returns to the basic characteristic MOD/, and drivability suitable for, for example, cruising driving or the above-mentioned traffic jam driving is obtained.

Also, while driving with the characteristic MOD/, if the driver suddenly depresses the accelerator pedal to achieve a large acceleration, and the operating speed 1d DAPS exceeds the reference value Llt- (T4),
Immediately characteristic MOD,? If selected, it will be possible to drive with a very good sense of acceleration. L/ is, for example, a6% opening/10m5
is set to .

As described above, when a driver needs to make minute adjustments to speed, such as when driving in traffic jams, the driver will find the appropriate function characteristics, and when a feeling of acceleration is desired, the driver will find the appropriate function characteristics. The selection is made depending on how much the accelerator pedal is depressed, which is operated unconsciously, making it easier to drive and providing a driving feeling with a good sense of acceleration. Moreover, the return to the basic function characteristic MOD/ is always performed when the accelerator is fully closed, so there is no risk that the function characteristic will change unexpectedly and surprise the driver, and the function characteristic will be returned naturally without the feeling of one step difference. You can drive by feeling.

Next, in the embodiment shown in FIG. 6, when returning to the basic function characteristic MOD/ when the accelerator is fully open, the return is performed only when the accelerator is fully closed for a certain period of time τCr (for example, 1 second) or more. Specifically, the determination is made in step /l.

Therefore, for example, in a vehicle equipped with a manual transmission, the seventh
As shown in the driving pattern shown in the figure, even if the driver performs an upshift operation, the characteristic MOD may change depending on the short period of time when the accelerator is fully closed during the shift operation (usually it can be completed within 1 second). /, thereby avoiding the accompanying dulling of the sense of acceleration and deterioration of drivability.

Effects of the Invention As is clear from the above explanation, the vehicle accelerator control device according to the present invention does not involve an artificial switching operation, but rather a system in which the driver unconsciously operates the accelerator according to the situation. Based on the operating speed of the accelerator member that is operated suddenly, the function characteristics are selected, making it easy to drive at low speeds, providing an excellent sense of acceleration, and providing a natural driving feeling without any discomfort. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a configuration explanatory diagram showing an embodiment of the invention, FIG. 3 is a characteristic diagram showing an example of preset function characteristics, and FIG. 4 5 is a flowchart showing the processing procedure for determining the throttle valve target opening, FIG. 5 is a time chart showing an example of characteristic switching according to this processing procedure, and FIG. 6 is a flowchart showing the different processing procedures for determining the throttle valve target opening. The flowchart shown in FIG. 7 is a time chart showing an example of characteristic switching according to this processing procedure. /... Stroke sensor, 3... Microcomputer, l... Differential circuit, 6... Servo drive circuit, 7
... Throttle valve opening sensor, ... Servo motor.

Claims (2)

[Claims] (1) An accelerator operation amount detection means for detecting the operation Jl of the accelerator member, an accelerator operation speed detection means for detecting the entire accelerator operation speed from a change in the upper i operation amount, and an accelerator operation speed detection means for detecting the entire accelerator operation speed from the change in the upper i operation amount, and setting the upper b peer accelerator operation speed to a predetermined reference value. A comparison means to compare,
A storage means for storing a plurality of functional characteristics between the manipulated variable and the engine throttle valve opening, and a storage means for storing a plurality of functional characteristics between the manipulated variable and the engine throttle valve opening, and sequentially storing the functional characteristics in a predetermined order based on the judgment result of the comparison means from among the plurality of stored functional characteristics. function characteristic selection means for selecting a basic function characteristic when the accelerator operation amount detection means outputs accelerator fully closed No. 1d; A vehicle accelerator control device comprising a throttle valve opening degree setting means for setting a valve opening degree, and a throttle valve drive mechanism that drives the throttle valve to open and close with the set throttle valve opening degree as a target. (2) The vehicle according to claim 1, wherein the function characteristic selection means selects the basic function characteristic when the accelerator fully closed signal is continuously output for a predetermined period of time. accelerator control device.