JPH01211643A - 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. 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 the thumb throttle lever 40. When the switch 44 is returned and a CPU 52 receives data that the engine is running, the CPU 52 reads out the characteristics B from the RAM 58 and determines the target engine speed or the target running speed. A driving circuit 66 then controls the motor 30 to obtain the target value. There fore, 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 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 the engine of an e-motorcycle, etc., when the intake negative pressure of the engine becomes excessive, or when the sliding part of the throttle valve or wire is frozen or sand is stuck, etc. Throttle 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. Conventional throttle control has been performed by mechanically transmitting the movement of a throttle operator to a throttle valve via a wire, link, or the like. When this throttle control is electrically controlled as described above, the throttle valve is controlled to follow the operation amount of the throttle operator. However, if such a control method is adopted, the running speed will fluctuate greatly, especially when driving in places where the road surface gradient or road resistance changes greatly, such as when driving on rough terrain or work vehicles. 7) There was a problem that the operation became troublesome.

(Purpose of the Invention) The present invention was made in view of the above circumstances, and is intended to solve the problem when driving conditions change significantly when the amount of rotation of the throttle operator is electrically detected and the throttle valve is driven by an accumulator. To provide a throttle control device for a vehicle that can easily run a vehicle at a low speed and greatly facilitate throttle operation.

(Structure of the Invention) According to the present invention, this object is to detect the operation amount of the throttle operator, which has a habit of returning to the direction of closing the throttle valve, with an angle sensor, and to respond to this operation amount using an accumulator. A throttle control device for a vehicle that controls a throttle valve using a throttle control device, which determines a target speed for a manipulated variable of a throttle operator based on control characteristics, and controls a throttle valve opening degree so as to reach the target speed. This is accomplished by the vehicle's throttle control device.

(Embodiment) Fig. 1 is an overall conceptual diagram of an embodiment of the present invention, Fig. 2 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 A diagram showing the control characteristic A, and FIG. S7 is a diagram showing the control characteristic B.

In Figure 2.3, reference numeral 10. TO is the steering front wheel with wide ultra-low pressure tires, 12.12 is the driving rear wheel with similar tires, and 14 is the 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 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 characteristic selection attached to the case 36, and this switch 44 is used when manually selecting a characteristic. 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. Here, characteristic A in FIG. 6 is used when starting the engine, and is the opening degree θ of the throttle valve 28 with respect to the rotation DNo of the thumb throttle lever 40, which is the output of the angle sensor 42.
is defined using engine temperature T (To, T1...) as a parameter. Characteristic B in FIG. 7 is used during engine operation, and the thumb throttle lever 40
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. A signal indicating the rotational speed of the rear wheel 12 and a signal of the speed sensor 64 serving as speed detection means for detecting the rotational speed of the rear wheel 12 are 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 mV shown in FIG.

First, CPtJ52 is the angle sensor 4 which is the operation amount detection means.
2 and the engine temperature T are read (FIG. 5, step 100). If the switch 44 is operated at the time of starting the engine 14, the starting characteristic A is selected, and if the switch 44 returns and it is input that the engine 14 is running, the running characteristic B is selected ( 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 α of the switch 44. This special selection means can also 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 8, and the target opening degree θ 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 θ (eo, 01...) for starting differs depending on the temperature T (To, TI...), each temperature T
The opening degree e for is determined from the temporality A (step 10
4). When the target opening e is determined based on characteristic A, the motor 30 is controlled by the drive circuit 66 (FIG. 1) so that the throttle valve 28 reaches this opening e (step 106).
). Then, the motor 30 is driven until the opening degree e' of the throttle valve 28 reaches the target opening degree e, and if they match, the process returns to the first step 100 and the above operation is repeated (step 1
08). At this time, if the target opening degree e is not reached even after a certain period of time, it is determined that there is an abnormality (Step 110)
, the engine is stopped (step 112). For example, CD
The charging circuit of I ignition circuit 62 is grounded by switch 68 (FIG. 1). Then, the warning lamp 70 (FIG. 1) is turned on (step 114).

As the engine temperature T gradually increases, the optimum opening degree θ according to 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 vehicle's target traveling speed V
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, and if there is an abnormality (step 122).
) The engine is stopped (Step 112), and the lamp 70 is turned on (Step 114).

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 e is determined using the 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 such as those indicated by `` 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'I, it is suitable for economical driving with improved economy.In this case, which characteristic to use depends on various factors such as engine temperature and transmission gear, in addition to using a manual switch. It may be determined using operating conditions.

(Effects of the Invention) As described above, the present invention stores the control characteristic (B) of the engine (or traveling) speed with respect to the throttle operation amount in advance, and controls the throttle operation amount so that it indicates the speed. , it can always run 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.

[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 an accumulator, 40...
thumb throttle lever, 42... angle sensor as operation amount detection means, 58...
...RAM that stores characteristics A and B. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Scope of Claims] A vehicle that detects the operation amount of a throttle operator that has a habit of returning to the closing direction of the throttle valve using an angle sensor, and controls the throttle valve in accordance with this operation amount using an accumulator. A throttle control device for a vehicle, characterized in that the throttle control device determines a target speed for a manipulated variable of a throttle operator based on control characteristics, and controls a throttle valve opening degree so as to reach the target speed.