JPH01211644A - Throttle controller of vehicle - Google Patents

Abstract

PURPOSE:To enable running at constant speed if the angle of slope or the surface resistance may change by storing the control characteristics of an engine speed with respect to the control variable of a throttle valve more than the specified value. CONSTITUTION:A RAM 58 stores both the control characteristics A which determines the revolution speed or the running speed of an engine 14 with respect to the amount of turn of a thumb throttle lever 40, that is, the output of an angle sensor 42. The return of the lever 40 to a position within the speci fied area is considered as a play B and no target value is set for such return within the play area B. When a CPU 52 reads the output of the angle sensor 42 to determine that the position of the lever 40 is out of the play area B, the CPU 52 sets a target engine speed or a target running speed. A driving circuit 66 then controls a motor 30 to obtain the target value. Therefore, when the angle of slope or the surface resistance of the road may change, a vehicle may run at a constant speed.

Description

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

(Background of the Invention) In engines such as motorcycles, when the intake negative pressure of the engine becomes excessive, or when the sliding parts and wires of the throttle valve are frozen or sand is bitten, the throttle valve returns. Defects (stick) may occur.

Therefore, the amount of operation of the throttle operator is detected by an angle sensor, the engine speed or traveling speed is set based on this amount of operation, and the throttle valve is rotated by an accumulator such as a servo motor to reach this speed. It is possible that

However, when the target speed is set using the throttle operator in this manner, a load is constantly applied to the accumulator when the speed does not decelerate to the target speed indicated by the return position of the throttle operator.

In other words, when the actual speed becomes higher than the target speed corresponding to this return position, for example when exiting the plane or applying engine braking to decelerate, the accumulator continues to operate in the direction of closing the throttle valve, and during this time A large load continues to be applied to the accumulator. This condition can also occur when the engine speed is set with the throttle operator and the idle adjustment of the throttle valve is improper. That is, this is a case where the idle speed is set higher than the minimum set speed based on the throttle operation amount.

If the target speed is set using the throttle operator in this way, an excessive load will continue to be applied to the accumulator.
For example, when using a motor, a large current exceeding its rating may flow through the motor for a long time, potentially damaging the motor.
There was a problem. Furthermore, there was a risk that excessive force would be applied to the bearings and the bearings would be damaged.

(Object of the Invention) The present invention was made in view of the above circumstances, and when a target speed is set with the throttle operator and the accumulator is used to drive the throttle valve to achieve this speed, the accumulator It is an object of the present invention to provide a throttle control device for a vehicle that does not apply an excessive load and prevents excessive force from being applied to an accumulator, a throttle valve bearing, etc.

(Structure of the Invention) According to the present invention, the purpose is to detect the operation amount of the throttle operator, which has been given a return habit, with an angle sensor, set the speed of the vehicle based on this operation amount, and reach the speed. In a vehicle throttle control device in which opening and closing of a throttle valve is controlled by an accumulator, a play range in which no speed setting is performed is provided on the return position side of the throttle operator, and within this play range, the throttle valve is set to an idling position. This is achieved by means of a vehicle throttle control device which is characterized in that it controls.

(Embodiment) Fig. 1 is an overall conceptual diagram of an embodiment of the present invention, Fig. 82 and 3
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 3 is a diagram showing control characteristics A. FIG.

In Fig. 2.3, reference numeral 1O110 is a steering front wheel with wide ultra-low pressure tires, 12.12 is a driving rear wheel 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 behind the steering handlebar 18, a firing tank 20 and a straddle-type normal rotation seat 22 are sequentially arranged.

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 thumb throttle lever attached to the lower end of the support shaft 38. 40, and an angle sensor 42 housed in the case 36 and rotated by the thumb throttle lever 40 to detect the operation amount of the thumb throttle lever 40. The thumb throttle lever 40 and the angle sensor 42 are provided with a return behavior in which the return direction of the lever 40, that is, the rotation end of the lever 40 is directed rearward by a spring (not shown).

In Figure S1, 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 AM 58 stores in advance the control characteristic A shown in FIG. Characteristic A in FIG. 6 defines the engine rotational speed N or traveling speed V with respect to the operation amount θ of the thumb throttle lever 40, but it is a constant value from the return position (fully closed position) of the lever 40 to 00. This range is defined as play range B, and target speed N (V) is not set for this play range B.

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 outputted by the angle sensor 42 and C
The signal indicating the engine rotation speed n detected from the ignition signal of the DI ignition device 62 and the signal of the speed sensor 64 as a speed detection means for detecting the rotation speed h of the rear wheel 12 are CP
It is input to U52. In this case, the CDI ignition device 62 functions as a speed detection means for detecting the engine rotational speed n (see FIG. 4).

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.

First, the CPU 52 uses the angle sensor 42 which is an operation amount detection means.
The output θ of is read (Fig. 5, step 100), and the manipulated variable θ(1) at this time t is greater than a certain amount from the manipulated variable θ(1-1°) read a certain time ago (1-1+). If it has not changed (step 102), it remains on standby; if it has changed by a certain amount or more, it is determined whether the manipulated variable θ is smaller than 00 (step 104). That is, it is determined whether the position of the throttle lever 40 is within the play range B from the return (fully open) position to 00 shown in FIG.

0>OO, and if it is determined that it is outside the play range B, the CPU 52 reads out the characteristic A shown in FIG. 6 from the RAM 58 to determine the target engine speed N (step 106).

Instead of this target engine speed N, the target running speed of the vehicle may be found. In this case, it is of course necessary to prepare the characteristic A in FIG. 6 that indicates the running speed V instead of the engine speed N. It is. The CPU 52 reads the engine speed n (or traveling speed h) (step 108), and then drives the motor 30 until the speed n(h) reaches the target speed N (V) (steps 110 and 112). When the target speed N (V) is reached (step 112), the motor 30
is stopped (step 114), and the process returns to step 100 to repeat the above operations. At this time, if the target speed N (V) is not reached even after a certain period of time has elapsed, it is determined that there is an abnormality (step 116), and the engine is stopped (step 118). 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 120).

On the other hand, if the manipulated variable θ is less than 00 and within the play range B (step 104), the CPU 52 returns the throttle valve 28 to the fully closed (idling) position (step 122) and stops the motor 30. (Step 114
). The fully closed position of the throttle valve 28 can be detected by providing a position sensor on the motor 30 or a fully closed sensor on the carburetor 26.

Note that in FIG. 4, the functions corresponding to the operations of the CPU 52 are given the step numbers in FIG. do not have.

In addition to the solid line shown in FIG. 6, various characteristics such as those shown by A' and A'' may be stored as the characteristic A, and one of them may be appropriately selected and used. The characteristic A' shown in the figure is suitable for sport driving where the engine output is high, and the characteristic A'' is suitable for economical driving where the engine output is increased. In this case, which characteristic to use can be determined by setting with a manual switch or by using various operating conditions such as engine temperature and gear position of the transmission.

(Effects of the Invention) As described above, the present invention stores in advance the control characteristic (A) of the engine (or traveling) speed with respect to the throttle operation amount, and when the throttle operation amount is at a constant value, the throttle operation amount changes to the speed. Since the vehicle is controlled so as to show the following, the vehicle can always travel at a constant speed even if the slope changes or the road resistance changes. Therefore, it is very easy to drive, and is particularly suitable for vehicles for traveling on rough terrain, work vehicles, etc. In addition, when the amount of operation falls below a certain level, the throttle valve is held in the fully closed (idling) position, so even if the engine speed or traveling speed is high, no force is generated in the accumulator in the direction of closing the throttle valve, and the accumulator There is no risk of burning out due to overload, and no excessive force is applied to the bearings of the throttle valve drive system.

[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 3 is a diagram showing control characteristics A. FIG. 14... Engine, 28... Throttle valve, 30... Motor as an accumulator, 40...
Thumb throttle lever, 42... Angle sensor as operation amount detection means. 58...RAM that stores characteristic A. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] A vehicle in which the operating amount of a throttle operator that has been given a return habit is detected by an angle sensor, the speed of the vehicle is set based on this operating amount, and the opening and closing of the throttle valve is controlled by an accumulator to maintain this speed. A throttle control device for a vehicle, characterized in that a play range in which no speed setting is performed is provided on the return position side of the throttle operator, and a throttle valve is controlled to an idling position within this play range.