JPH01211646A - Throttle controller of vehicle - Google Patents

Abstract

PURPOSE:To enable both the exact defect detection and running control by detecting a defect in a control system when the difference between the target speed and an actual speed is not less than the specified value and the condition of a throttle valve where it is not opened fully nor closed fully is maintained for a specified period. 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 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 the thumb throttle lever 40. When receiving the output from the switch 44, a CPU 52 reads out the characteristics A or B from the RAM 58 and determines the target opening of the throttle valve 28 or the target speed. A driving circuit 666 then controls the motor 30 to obtain the target value. Therefore, when the absolute difference between the target opening and the actual opening is kept over the specified value for the specified period in the selection of the characteristics A, or when the absolute difference between the target opening and the actual opening is over the specified value in the selection of the characteristics B, a defect is considered and the driving is the limited.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention detects an abnormality in a control system when the amount of rotation of a throttle operator is detected by an angle sensor and the throttle valve is rotated by an accumulator. The present invention relates to a throttle control device for a vehicle that detects and limits running.

(Background of the Invention) In engines such as motorcycles, when the engine intake negative pressure becomes excessive, when the throttle valve's sliding parts or wires are frozen, or when sand etc. has bitten in, the throttle valve Failure to return (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. However, in this case, since the throttle valve and the throttle operator are not mechanically interlocked by wires, links, etc., it is desirable to immediately restrict travel when an abnormality occurs in the throttle valve control system.

(Purpose of the Invention) The present invention has been made in view of the above circumstances, and is intended to prevent abnormalities from occurring in the throttle control system when the amount of rotation of the throttle operator is electrically detected and the throttle valve is driven by the accumulator. To provide a throttle control device for a vehicle that promptly detects the occurrence of a vehicle failure and restricts travel.

(Structure of the Invention) According to the present invention, this object is to provide a vehicle which detects the operation amount of a throttle operator with an angle sensor and controls the throttle valve using an accumulator so as to achieve a target speed corresponding to this operation amount. In the throttle control device, a difference determining means for determining whether the difference between the target speed and the actual speed is equal to or greater than a certain value, and a direction opening determining means for determining whether the throttle valve is in a position other than the fully closed or fully open position; and a time determining means for outputting an abnormal signal by determining that the throttle valve is in a position other than fully open and the above condition in which the difference is constant has continued for a certain period of time or more, and based on the abnormal signal, This is achieved by a vehicle throttle control device that is characterized by restricting travel.

(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 A diagram showing the control characteristic A, and a diagram $7 is a diagram showing the control characteristic B.

In Fig. 2.3, reference numeral 10.10 is a steering front wheel with wide ultra-low pressure tires, 12.12 is a driving rear wheel with 4 tires of the same type, and 14 is an engine mounted near the center of the vehicle body. The output of the engine 14 is the drive shaft 1 shown in FIG.
6 to the rear wheels 12. A horizontal handlebar 18 is provided at the front of the upper part of the vehicle body, and behind the handlebar 18, a firing tank 20 and a straddle-type driver's 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 added 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 amount of rotation 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).

Note that 44 is a manual switch for selecting characteristics attached to the case 36, and this switch 44 is used when manually selecting characteristics. Of course, this switch 44 is not necessary when this characteristic 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
AM58 stores in advance control characteristics A and B shown in FIG. 6.7. Characteristic A in FIG. 6 is used when starting the engine, and is the opening degree θ of the throttle valve 28 relative to the rotation amount O of the thumb throttle lever 40, which is the output of the angle sensor 42.
is defined using engine temperature T (To, T+...) as a parameter. Characteristic B in FIG. 7 is used during engine operation, and the thumb throttle lever 40
This defines the engine rotational speed N or traveling speed V with respect to the amount of rotation θ.

The following data is input to the CPU 52 via the input interface 50. That is, the engine rotational speed n detected from a signal indicating the rotation amount θ of the thumb throttle lever 40 outputted by the angle sensor 42, a signal indicating the engine temperature T detected by the engine temperature sensor 60, and an ignition signal from the CDI ignition device 62 is determined. The signal indicating and rear wheel l? A signal from a speed sensor 64 serving as a speed detection means for detecting the rotational speed H is input to the CPU 52. In this case, the CDI ignition device 62 functions as a speed detection means for detecting the engine rotation 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.

First, the CPU 52 uses the angle sensor 42 which is an operation amount detection means.
The output θ and the engine temperature T are read, and the time t for abnormality detection described later is initialized to O (FIG. 5, step 100). When the switch 44 is operated when starting the engine 14, the starting characteristic A is selected and the switch 44 is operated.
4 is restored and it is input that the engine 14 is running, selects running characteristic B (step 102).
. When inputting whether to start the engine or whether the engine is already running using the manual switch 44 as in this embodiment, the characteristic A or B to be used is determined by the output signal a of the switch 44. This characteristic selection means can be performed automatically, and in this case, the determination may be made based on the presence or absence of an ignition signal from the ignition device 62, for example.

If the engine 14 is stopped, the CPU 52 uses the RAM 5
The characteristic A is read from B, and the target opening e is determined from the characteristic A based on the engine temperature T detected by the sensor 60. In other words, since the optimum opening degree e (θ0, el...) for starting differs depending on the temperature T (T o, T1...), the opening degree θ for each temperature T is determined from the temporality A (step 104). . When the target opening e is determined by characteristic A, the drive circuit 66 is set so that the throttle valve 28 reaches this opening e.
(FIG. 1) to control the motor 30 (Step 1)
06). Then, the motor 30 is driven until the actual opening e' of the throttle valve 28 reaches the target opening e, and if they match, the process returns to the first step lOO and repeats the above operation (
Step 108).

At this time, if the target opening degree e is not reached even after a certain period of time has elapsed, it is determined that there is an abnormality, and the abnormality detection means II, step 110), stops the engine or applies the brakes to restrict travel (driving Limiting means, step 112)
. For example, the charging circuit of the CDI ignition circuit 62 is connected to the switch 68.
(Figure 1) to ground. Then, the warning lamp 70 (FIG. 1) is turned on (step 114).

This abnormality detection means n (, j step 110) is, for example, l
” The absolute value of the difference between the nominal opening θ and the actual opening e′ is a constant value 6
Since the above state continues (step 110a) for a certain period of time ε or more (step 110b), an abnormality is determined and the engine is stopped. In FIG. 5, each time the operation of the abnormality detection means II is repeated, 1 is added to the time t, and the duration t of this state is determined from this t (step 110c).

As the engine temperature T gradually rises, the optimal opening degree e based on characteristic A changes accordingly, so the throttle valve 28
The opening degree also changes automatically.

After the engine 14 has started and warmed up sufficiently, switch 4
4 is manually or automatically restored, the CPU 52 reads the characteristic B shown in FIG. 7 from the RAM 58 to determine the target engine speed N (step 116). In place of this target engine speed N, the target traveling speed of the vehicle ■
In this case, the characteristic B in Fig. 7 is the speed N
It goes without saying that a device indicating the speed V should be prepared instead.

The CPU 52 reads the engine speed n (or traveling speed H) (step 118), and then drives the motor 30 until the speed n(H) reaches the target speed N (V) (Steps 120 and 122). When the target speed N (V) is reached (step 122), the process returns to step 100 and repeats the above operations.

At this time, if there is an abnormality (abnormality detection means ■, step 12
4) Stop the engine and limit driving Step 112
), the lamp 70 is turned on (step 114).

This abnormality detection means I detects that the speed n(hi) is the target speed II'N
(V) (step 122), it is determined whether the difference (absolute value) between the two is greater than a constant value α, that is, whether 1n−Nl>α, and (difference determining means, step 124a),
If it is less than α, the process returns to step 118, and if it is more than α, it is determined whether the throttle valve 28 is in the fully open position or not (valve opening degree determining means, step 124b). If the throttle valve 28 is fully open, it means that you are climbing up a steep slope, and if it is fully closed, you are descending, so it is determined that there is no abnormality, and step 1
Return to 18. If it is neither fully open nor fully closed, this state is 7.
Step 124c) determines whether or not the duration has continued for the above period of time, and if the time is t≧γ, it is determined that there is an abnormality and the process goes to step 112; if the time is less than t, it is determined that there is no abnormality and 1 is added to t (step 124).
c) Return to step 118. When controlling the traveling speed V instead of the engine speed N, it goes without saying that it is determined in step 124a whether 1-vl>β.

Note that in FIG. 4, the functions corresponding to the operations of the CPU 52 are assigned the step numbers in FIG. 5, and the functions corresponding to the sensors 42, 62, 64, switches 44, etc. Do not repeat the explanation.

In this embodiment, the engine temperature T is detected and the target opening degree θ is determined using characteristic A at the time of starting, so the operation at the time of starting the engine is very simple, and it can be handled using the control program and the contents of the memory. , the configuration is simple because no mechanical configuration is required. Of course, the present invention may omit the use of characteristic A and control only by characteristic B.

Furthermore, as for characteristic B, in addition to the solid line shown in FIG.
It is also possible to memorize various characteristics as shown in `` and select and use one of them as appropriate. For example, characteristic B'' in Fig. 7 is suitable for sports driving where the engine output is high. According to characteristic B II, it is suitable for economical driving with improved economy.In this case, which characteristic to use depends on various operating conditions such as using a manual switch or changing gears of the transmission. You may decide accordingly.

(Effects of the Invention) As described above, the present invention stores in advance the control characteristic (B) of the engine (or traveling) speed with respect to the throttle operation amount, controls the throttle operation amount to indicate the speed, and controls the If the difference between the speed and the actual speed is above a certain level and the throttle valve is neither fully open nor fully closed for a certain period of time, it is assumed that there is an abnormality in the control system, so the abnormality must be detected reliably. It is possible to restrict driving.

[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, and FIG. 7 is a diagram showing the control characteristic B. 14 engine, 28... throttle valve, 30... motor as accumulator, 40...
Thumb throttle lever, 42...Angle sensor as operation amount detection means, 58
...RAM for storing characteristics A and B, 124a...difference discrimination means, 124b...valve opening degree discrimination means, 124c...time discrimination means. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Scope of Claims] A throttle control device for a vehicle that detects the operation amount of a throttle operator with an angle sensor and controls the throttle valve using an accumulator so that the throttle valve reaches a target speed corresponding to the operation amount, the target speed being controlled by an accumulator. a difference determining means for determining whether the difference between the speed and the actual speed is greater than a certain value; a valve opening determining means for determining whether the throttle valve is in a position other than fully closed or fully open; and time determination means for determining that a state in which the vehicle is at a position where the difference is greater than a certain value has continued for a certain period of time or more and outputs an abnormal signal, and the traveling is restricted based on the abnormal signal. A vehicle throttle control device.