JPH01211642A - Throttle controller of vehicle - Google Patents

Abstract

PURPOSE:To enable optimum throttle valve control according to the running condition of a vehicle by selecting either the control characteristics of the throttle valve opening or the engine speed which are stored in advance with respect to the control variable of the throttle valve. CONSTITUTION:A RAM 58 stores both the control characteristics A which determines the opening of a throttle valve 28 according to the amount of turn of a thumb throttle lever 40, that is, to the output of an angle sensor 42 and the control characteristics B which determines the running speed range or the running speed of an engine 14 according to the amount of turn of a thumb throttle lever 40. Responding to the output signal of a manual switch 44 making the mode selection, a CPU 52 reads out the characteristics A or B from the RAM 58 and determines the target opening or the target speed of the throttle valve 28. A driving circuit 66 then controls the motor 30 to obtain the target value. Therefore, when precise control or quick control is made for the throttle valve is made, the characteristics A may be selected and when the constant speed running is executed, the characteristics B may be selected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle throttle control device that detects the amount of rotation of a throttle operator using an angle sensor and rotates a throttle valve using an accumulator. be.

(Background of the Invention) In engines such as motorcycles, when the intake negative pressure of the engine becomes excessive, or when the sliding parts or wires of the throttle valve are frozen or bitten with mortar, etc., the throttle valve Valve return failure (stick) may occur.

Therefore, it may be possible to detect the amount of rotation of the throttle operator using an angle sensor and rotate the throttle valve using an accumulator such as a servo motor. in this case,
The problem is how to make the amount of operation of the throttle operator correspond to the amount of operation of the throttle valve. For example, in order to start the engine or to accelerate or decelerate rapidly, it is desirable to be able to delicately control the opening of the throttle valve or to be able to open and close it rapidly.Also, while driving at a constant speed, the speed may increase due to changes in road surface slope, road resistance, etc. It is preferable that there is no fluctuation because throttle operation becomes easier.

(Objective of the Invention) The present invention was made in view of the above circumstances, and it is possible to change the correspondence between the throttle operation amount and the throttle valve opening, and it is possible to perform delicate control of the throttle valve opening and rapid control. It is an object of the present invention to provide a throttle control device for a vehicle that enables opening and closing as well as suitable control even when traveling at a constant speed.

(Structure of the Invention) According to the present invention, the object is to provide a vehicle throttle control device that detects the operation amount of a throttle operator with an angle sensor and controls the throttle valve to an opening corresponding to this operation amount using an accumulator. a first memory means for storing control characteristics of the throttle valve opening with respect to the operation amount of the throttle operator; and a first memory means storing control characteristics of the engine rotation speed or traveling speed with respect to the operation amount of the throttle operator; comprising a second memory means and a mode selection means;
This is achieved by a throttle control device for a vehicle, which controls the opening and closing of a throttle valve using one of the control characteristics selected by the mode selection means.

If the mode selection means is configured with a manual switch, the mode can be selected according to the driver's preference. The mode selection means automatically selects the control characteristic of the first memory means when the engine rotational speed or the running speed is less than a certain speed;
The control characteristics of the second memory means may be automatically selected when the speed is above a certain speed.

(Embodiment) Figure 1 is an overall conceptual diagram of an embodiment of the present invention, Figures 2 and 3 are
The figures are a side view and a plan view of a four-wheeled vehicle for traveling on rough terrain to which this embodiment is applied, FIG. 4 is a block diagram showing the operation of one embodiment of the present invention, FIG. 5 is an operation flowchart, and FIG. 6 is a FIG. 7 is a diagram showing the control characteristic A of the first memory means, and FIG. 7 is a diagram showing the control characteristic B of the second memory means.

In Fig. 2.3, symbols to and io are steering front wheels with wide ultra-low pressure tires, 12.12 are 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. A steering handlebar 18 is provided at the front of the upper part of the vehicle body, and a fuel tank 20 and a straddle-type driver's seat 22 are sequentially provided behind the steering handlebar 18.

A carburetor 26 is attached to an intake pipe 24 connected to the engine 14. The throttle valve 28 of this carburetor 26
As shown in FIG. 1, the rotation of a servo motor 30 serving as an actuator 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 attached near the right grip 18a of the handlebar 18. As shown in FIG. 1, this device 34 includes a case 36 fixed to the handlebar 18 side, a support shaft 38 projecting downward from the case 36, and a throttle operator attached to the lower end of the support shaft 38. a thumb throttle lever 40 as a
The angle sensor 42 is housed in the case 36 and rotated by the thumb throttle lever 40, and serves as an operation amount detection means for detecting the amount of rotation of the thumb throttle lever 40. The thumb throttle lever 40 and the angle sensor 42 are given a return behavior in which the return direction of the lever 40, that is, the pivoting end of the lever 40 is directed rearward by a spring (not shown).

Note that 44 is a manual switch for mode selection attached to the case 36, and this switch 44 is used when mode selection is performed manually. Of course, this switch 44 is unnecessary when this mode selection is performed automatically as described later.

In FIG. 1, the control device includes an input interface 50,
CPU52, output interface 54, ROM56,
and RAM58.

The ROM 56 stores a control program for the CPU 52, and the R
The AM58 stores the control characteristics A and B shown in FIG. 6.7 in advance and functions as first and second memory means. Here, characteristic A in FIG. 6 defines the opening degree e of the throttle valve 28 with respect to the rotation amount θ of the thumb throttle lever 40, which is the output of the angle sensor 42. Further, characteristic B in FIG. 7 defines the engine rotational speed N or traveling speed ■ 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 5o. That is, the engine rotation speed is determined from a signal indicating the rotation amount θ of the thumb throttle lever 4o outputted by the angle sensor 42, a fully closed signal α from the sensor 60 that detects the fully closed position of the throttle valve 28, and an ignition signal from the CDI ignition device 62. The signal indicating n and the signal of the speed sensor 64 as speed detection means for detecting the rotational speed h of the rear wheel 12 are
It is input to the CPU 52. In this case, the CDI ignition device 62
has a function as a speed detection means for detecting the engine rotational speed n.

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

That is, the CPU 5'2 reads the output θ of the angle sensor 42, which is the operation amount detection means, and the engine rotational speed n (FIG. 5, step 100), and determines which mode is selected by the mode selection means. Determine whether to use characteristic A in Figure 6 or characteristic B in Figure 7 (Step 1
02). When mode selection is performed using the manual switch 44 as in this embodiment, the determination is made based on the output signal β of the switch 44. This mode selection means can also be performed automatically, and in this case, for example, the engine rotation speed n is a constant speed N+ (for example, 1000R, P).

The CPU 52 may decide to use the characteristic A below M, and the characteristic B above that.

The CPU 52 converts the characteristic A or B selected in this way into R.
Read from AM58 and find the target opening e or target speed N of the throttle valve 28 (steps 104 and 106)
. Furthermore, when controlling the traveling speed of the vehicle instead of the target speed N, the target speed (2) may be determined. When the target opening degree θ is determined using characteristic A, the throttle valve 28 adjusts to this opening degree e.
The motor 3 is driven by the drive circuit 66 (FIG. 1) so that
0 (step 108). Then, the motor 30 is operated until the opening e' of the throttle valve 28 reaches the target opening e.
If they match, the process returns to the first step 100 and the above operations are repeated (step 110). At this time, if the target opening degree e is not reached even after a certain period of time has elapsed, or if the sensor 60 that detects the fully closed state of the throttle valve 28 continues to detect fully closed and the throttle valve 28 does not move from fully closed, etc. It is determined that there is an abnormality (step 112), and the engine is stopped (step 114). For example, the charging circuit of CDI ignition circuit 62 is grounded by switch 68 (FIG. 1). Then, the warning lamp 70 (Fig. 1) is turned on (step 11).
6).

On the other hand, when characteristic B is selected, the drive circuit 66 controls the motor 30 to achieve this target speed N (V).

For example, known PID control is performed (step 118). When the target speed N (V) is reached (step 120),
Return to step 100 and repeat the above operations, and if there is an abnormality (step 122), the engine will be stopped (step 114), and the lamp 70 will be turned on (step 116).
). In FIG. 4, the functions corresponding to the operations of the CPU 52 are given the step numbers in FIG.
Functions corresponding to 4, switch 44, etc. are numbered, and their explanations will not be repeated.

In this embodiment, the case where the engine rotational speed N is specified and the case where the traveling speed V is specified with respect to the rotation amount θ of the throttle lever 40 are explained in characteristic B, but the characteristics of both speeds N and V are separately determined. Of course, it is also possible to select from three characteristics in addition to characteristic A.

Further, the determination of which timing A or B to use is not limited to the manual switch 44 or the engine speed n; for example, characteristic A is used in a low gear of the transmission and characteristic B is used in a high gear. , various embodiments are possible, and the present invention includes such other embodiments.

Furthermore, the characteristics A and B are not limited to the linear ones shown in Figure 6.7, and of course can be made in various ways, such as using quadratic curves or curves that are convex upward or downward. .

(Effects of the Invention) As described above, the present invention stores in advance the characteristics (A) of the throttle valve opening degree and the characteristics CB) of the engine (or rather traveling) speed with respect to the throttle operation amount, and either Therefore, one of the control characteristics (A) can be used when performing subtle or sudden control of the throttle valve opening, such as when starting the engine or during sports driving. and when traveling at a constant speed, the other characteristic (B) can be used,
This has the effect of making it possible to perform optimal throttle control according to the driving conditions.

[Brief explanation of the drawing]

Figure 1 is an overall conceptual diagram of an embodiment of the present invention, Figures 2 and 3 are
The figures are a side view and a plan view of a four-wheeled vehicle for traveling on rough terrain to which this embodiment is applied, FIG. 4 is a block diagram showing the operation of one embodiment of the present invention, FIG. 5 is an operation flowchart, and FIG. 6 is a FIG. 7 is a diagram showing the control characteristic A of the first memory means, and FIG. 7 is a diagram showing the control characteristic B of the second memory means. 14... Engine, 28... Throttle valve, 30... Motor as an accumulator, 40...
Thumb throttle lever, 42...Angle sensor as operating amount detection means, 44.
...Manual switch as mode selection means, 58...
RAM as first and second memory means for storing characteristics A, B; Patent applicant Yamaha Motor Co., Ltd.

Claims (3)

[Claims] (1) In a vehicle throttle control device that detects the operation amount of a throttle operator with an angle sensor and controls the throttle valve to an opening corresponding to the operation amount using an accumulator, the a first memory means for storing a control characteristic of the throttle valve opening; a second memory means for storing a control characteristic of the engine rotation speed or traveling speed with respect to the operation amount of the throttle operator;
What is claimed is: 1. A throttle control device for a vehicle, comprising: mode selection means, and controlling opening/closing of a throttle valve using one of the control characteristics selected by the mode selection means. (2) The vehicle throttle control device according to claim 1, wherein the mode selection means is constituted by a manual switch. (3) The mode selection means selects the control characteristic of the first memory means below a certain engine rotation speed, and selects the control characteristic of the second memory means above the same engine rotation speed. A vehicle throttle control device according to claim 1.