JP2896142B2 - Vehicle throttle control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a throttle control device for a vehicle in which a rotation amount of a throttle operator is detected by an angle sensor and a throttle valve is rotated by an accumulator. is there.

(Background of the Invention) In an engine such as a motorcycle, when the intake negative pressure of the engine becomes excessive, or when a sliding portion of the throttle valve or a wire is frozen or bitten by sand or the like occurs, the throttle valve is opened. Return failure (stick) may occur.

Therefore, it is conceivable to detect the amount of rotation of the throttle operator with an angle sensor and rotate the throttle valve with an accumulator such as a servomotor. In this case, how to make the operation amount of the throttle operator correspond to the operation amount of the throttle valve becomes a problem. For example, it is desirable to be able to finely control the opening of the throttle valve or open and close it rapidly for engine start or rapid acceleration / deceleration, and when traveling at a constant speed, the speed increases due to changes in road surface gradient, road surface resistance, etc. It is desirable that the pressure does not fluctuate because the throttle operation becomes easy.

(Object of the Invention) The present invention has been made in view of such circumstances,
The correspondence between the throttle operation amount and the opening of the throttle valve can be changed, enabling delicate control of the throttle valve opening and rapid opening and closing, as well as suitable control even when traveling at a constant speed. It is an object of the present invention to provide a throttle control device for a vehicle.

(Constitution of the Invention) According to the present invention, an object of the present invention is to provide a throttle control device for a vehicle that detects an operation amount of a throttle operator with an angle sensor and controls a throttle valve in accordance with the operation amount using an accumulator. First memory means for storing the control characteristic of the throttle valve opening degree with respect to the operation amount of the throttle operator, and second memory means for storing the control characteristic of the engine speed or running speed with respect to the operation amount of the throttle operator. A mode selection means for selecting a control characteristic of the first memory means when the engine speed is lower than a certain engine speed, and a control characteristic of the second memory means when the engine speed is higher than the engine speed; When the control characteristic of the means is selected, the target value of the throttle valve opening is selected and the control characteristic of the second memory means is selected. And a calculating means for calculating a target value of the engine speed or the running speed when the throttle valve is opened and closed so as to make the throttle valve coincide with the target value.

Here, the mode selection means may be configured to select the control characteristic of the first memory means at the low speed stage of the transmission and select the control characteristic of the second memory means at the high speed stage.

(Embodiment) FIG. 1 is an overall conceptual diagram of one embodiment of the present invention, FIG. 2 and FIG. 3 are side and plan views of a four-wheeled all-terrain vehicle to which this embodiment is applied, FIG. FIG. 5 is a block diagram showing the operation of one embodiment of the present invention, FIG. 5 is an operation flowchart, FIG. 6 is a diagram showing a control characteristic A of the first memory means, and FIG. FIG.

2 and 3, reference numerals 10 and 10 denote front steering wheels with wide ultra-low pressure tires, 12 and 12 denote driving rear wheels with similar tires, and 14.
Is an engine mounted near the center of the vehicle body. The output of the engine 14 is transmitted to the rear wheels 12 by a drive shaft 16 shown in FIG. Steering handlebar 18 on the front of the upper body
However, a fuel tank 20 and a straddle-type operation seat 22 are sequentially disposed behind the fuel tank 20.

A carburetor 26 is attached to an intake pipe 24 connected to the engine 14. As shown in FIG. 1, the throttle valve 28 of the carburetor 26 has a servomotor as an actuator.
The rotation of 30 is transmitted via a reduction gear 32. That is, the throttle valve 28 is opened and closed by the motor 30.

A thumb throttle lever device 34 is mounted near the right grip 18a of the handlebar 18. This device 34
As shown in FIG. 1, a case 36 fixed to the handlebar 18 side and a support shaft 38 protruding downward from the case 36 are provided.
And a thumb throttle lever 40 as a throttle operator attached to the lower end of the support shaft 38, and an operation for detecting the amount of rotation of the thumb throttle lever 40 by being rotated by the thumb throttle lever 40 accommodated in the case 36. An angle sensor 42 as an amount detecting means. The thumb throttle lever 40 and the angle sensor 42 are provided with a return behavior in which a return direction of the lever 40, that is, a rotation end of the lever 40 is directed rearward, by a spring (not shown).

Reference numeral 44 denotes a mode selection manual switch attached to the case 36. This switch 44 is used when performing mode selection manually. Here, a switch 44 for selecting this mode is provided to facilitate understanding of the present invention. However, in the present invention, such a switch 44 is actually unnecessary because the mode selection is automatically performed as described later. It is.

In FIG. 1, the control device is an input interface 50,
CPU 52, output interface 54, ROM 56, and RAM 58
Having. The ROM 56 stores a control program for the CPU 52, and
M58 stores control characteristics A and B shown in FIGS. 6 and 7 in advance, and functions as first and second memory means.
Here, the characteristic A in FIG. 6 indicates that the throttle valve 28 with respect to the rotation amount θ of the thumb
Defines the degree of opening の. The characteristic B in FIG.
Defines the engine rotation speed N or the traveling speed V with respect to the rotation amount θ of the thumb throttle lever 40.

The following data is input to the CPU 52 via the input interface 50. That is, a signal indicating the rotation amount θ of the thumb throttle lever 40 output from the angle sensor 42, a fully closed signal a of the sensor 60 for detecting the fully closed position of the throttle valve 28, and CD
A signal indicating the engine speed n from the ignition signal of the ignition device 62 and a signal from a speed sensor 64 as speed detection means for detecting the rotation speed の of the rear wheel 12 are input to the CPU 52.
In this case, the CDI ignition device 62 has a function as speed detection means for detecting the engine speed n.

The CPU 52 of this control device performs the operation shown in FIG. 5 according to the program stored in the ROM 56. This operation has the function shown in FIG.

That is, the CPU 52 is provided with an angle sensor 42 serving as an operation amount detection unit.
And the engine rotation speed n are read (FIG. 5,
Step 100), it is determined which mode is selected by the mode selecting means, in other words, whether to use the characteristic A in FIG. 6 or the characteristic B in FIG. 7 (step 102). In this embodiment, the mode is selected by the manual switch 44 as shown in FIG.
It is formed by software of the CPU 52. For example, the CPU 52 uses the characteristic A when the engine rotation speed n is lower than the constant speed N ₁ (for example, 1000 R.
And the output signal β is turned on and off.

The CPU 52 stores the characteristic A or B thus selected in the RAM 58.
And the target opening Θ or the target speed N of the throttle valve 28 is obtained. Steps 104 and 106 serve as calculation means for obtaining these target values. When controlling the traveling speed の of the vehicle instead of the target speed N, the target speed V may be obtained. When the target opening degree 求 め is obtained from the characteristic A, the drive circuit 66 sets the throttle valve 28 to the opening degree Θ.
(FIG. 1) to control the motor 30 (step 10
8). Then, the motor 30 is driven until the opening degree ス ロ ッ ト ル 'of the throttle valve 28 reaches the target opening degree 、, and if they coincide with each other, the process returns to the first step 100 and the above operations are repeated (step 110).
At this time, if the target opening Θ does not reach the target opening っ て も after a certain time or more, or if the sensor 60 for detecting the fully closed state of the throttle valve 28 continues to detect the fully closed state and the throttle valve 28 does not move from the fully closed state, etc. It is determined that there is an abnormality (step 112), and the engine is stopped (step 114). For example, the charging circuit of the CDI ignition circuit 62 is grounded by the switch 68 (FIG. 1). Then, the warning lamp 70 (FIG. 1) is turned on (step 116).

On the other hand, when the characteristic B is selected, the drive circuit 66 controls the motor 30 so as to reach the target speed N (V). For example, known PID control is performed (step 118). When the target speed N (V) is reached (step 120), the process returns to step 100 and the above operations are repeated. If there is an abnormality (step 122), the engine is stopped (A step 114), and the lamp 70 is turned on (A step 114). Step 116). In FIG. 4, the functions corresponding to the operation of the CPU 52 are given the step numbers in FIG. 5, and the functions corresponding to the sensors 42, 62, 64, the switches 44, etc. are given the numbers. The description will not be repeated.

In this embodiment, the case where the engine rotational speed N and the case where the traveling speed V is defined with respect to the rotation amount θ of the throttle lever 40 is described with the characteristic B, but the characteristics of the two speeds N and V are separately described. It goes without saying that it is also possible to select from three characteristics together with the characteristic A.

The determination of which characteristic A or B to use may be based on the characteristic A at the low speed stage of the transmission and the characteristic B at the high speed stage, instead of using the engine speed n.

Further, the characteristics A and B are not limited to the linear ones shown in FIGS. 6 and 7, but various things such as those using a quadratic curve and those using an upward or downward convex curve are of course possible. .

(Effect of the Invention) As described above, the invention of claim 1 stores in advance the characteristic (A) of the throttle valve opening degree and the characteristic (B) of the engine (or traveling) speed with respect to the throttle operation amount. When the engine speed is lower than a certain value, the characteristic (A) is selected. When the engine speed is higher than the predetermined value, the characteristic (B) is selected and controlled. When it is necessary to open or close quickly while controlling the vehicle speed, the characteristic (A) enables such control. When the vehicle runs at a certain speed or more, the vehicle can be controlled by the characteristic (B). Optimal throttle control becomes possible.

According to the second aspect of the invention, since the transmission is controlled by the characteristic (A) at the low speed and by the characteristic (B) at the high speed, the characteristic (A) can be mainly used at the time of idling or acceleration. Optimal throttle control becomes possible.

[Brief description of the drawings]

FIG. 1 is an overall conceptual diagram of one embodiment of the present invention, and FIGS.
FIG. 1 is a side view and a plan view of a four-wheeled off-road vehicle to which this embodiment is applied, FIG. 4 is a block diagram showing the operation of an embodiment of the present invention, FIG. 5 is an operation flowchart, and FIG. FIG. 7 shows a control characteristic A of the first memory means, and FIG. 7 shows a control characteristic B of the second memory means. 14 ... Engine, 28 ... Throttle valve, 30 ... Motor as accumulator, 40 ... Thumb throttle lever, 42 ... Angle sensor as operation amount detecting means, 44 ... Mode selection switch expressed by a switch for convenience 58 ... Characteristic A, RAM serving as first and second memory means for storing B, steps 104, 106,...

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F02D 9/00-11/10 F02D 41/00-45/00 395

Claims (2)

(57) [Claims] 1. A throttle control device for a vehicle which detects an operation amount of a throttle operator with an angle sensor and controls a throttle valve in accordance with the operation amount using an accumulator. First memory means for storing a control characteristic of a throttle valve opening degree, second memory means for storing a control characteristic of an engine speed or a running speed with respect to an operation amount of the throttle operator,
When the engine speed is lower than a certain value, the control characteristic of the first memory means is selected.
A mode selecting means for selecting a control characteristic of the memory means, and selecting a control value of the throttle valve opening and a control characteristic of the second memory means when the mode selecting means selects the control characteristic of the first memory means. Calculating means for obtaining a target value of the engine rotation speed or the running speed when the engine is turned on, and opening and closing the throttle valve so as to match the target value. 2. The mode selecting means selects a control characteristic of the first memory means at a low speed stage of the transmission, and selects a control characteristic of the second memory means at a high speed stage. 3. The throttle control device for a vehicle according to claim 1, wherein