JPH0689697B2 - Slot engine control device for vehicle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a throttle control device for opening a throttle valve of a vehicle engine according to a predetermined control characteristic that is not simply proportional to the depression amount of an accelerator pedal. Regarding

(Prior Art) Conventionally, as this type of device, instead of mechanically opening a throttle valve in conjunction with an accelerator pedal, an actuator such as a pulse motor is directly connected to a throttle valve, and the actuation of the actuator is controlled by the accelerator pedal. Open the throttle valve according to the desired valve opening characteristics by controlling it by the control circuit that inputs the signal from the accelerator detector that detects the depression amount and the signal from the throttle detector that detects the opening of the throttle valve. It is known that he was allowed to do so.

In addition, a mechanical interlocking mechanism that opens a rotating body that mechanically interlocks a throttle valve with an accelerator pedal to an accelerator opening that is proportional to a rotation angle, and an actuator that can reduce the opening of a throttle valve below the accelerator opening. It is also known that the actuator is equipped with and the actuator is actuated at the time of deceleration to forcibly close the throttle valve to improve fuel economy.

(Problems to be Solved by the Invention) By the way, in the latter prior art, the proportional characteristic of the rotating body and the throttle valve is set so that the accelerator opening is higher than a desired valve opening characteristic, and the actuator is set. The operation of the throttle valve is controlled by a control circuit for inputting a signal from the accelerator detector for detecting the depression amount of the accelerator pedal and a signal from the throttle detector as in the case of the former prior art, to open the throttle valve to a desired value. It is possible to open the valve according to the characteristics.

In this case, in order to ensure the control accuracy of the control circuit, both signals are detected so that the signal from the accelerator detector at the time when the throttle valve starts to be opened from the fully closed position and the signal from the throttle detector match. It is necessary to make a reference adjustment of the detector, but since both detectors are placed separately from each other in the vehicle compartment and the engine room, the adjustment work becomes troublesome, and when adjusting the amount of play of the accelerator pedal, both detectors must be adjusted. There is a problem that readjustment becomes necessary and maintenance becomes troublesome.

The present invention includes the above mechanical interlocking mechanism,
Focusing on the fact that the rotation angle of the rotating body becomes a parameter corresponding to the depression amount of the accelerator pedal, it is an object of the present invention to provide a device that solves the above problems by performing control according to the rotation angle of the rotating body. And

(Means for Solving Problems) In order to achieve the above object, the present invention opens a throttle valve of a vehicle engine to an accelerator opening degree proportional to a rotation angle of a rotating body mechanically interlocked with an accelerator pedal. A mechanical interlocking mechanism and an actuator capable of reducing the opening degree of the throttle valve to be equal to or smaller than the accelerator opening degree, wherein an accelerator detector that detects the rotation angle coaxially with the rotating body, and the throttle valve And a throttle detector for detecting the opening degree coaxially with the throttle opening degree of the throttle valve with the rotation angle of the rotating body as a parameter by a control circuit for inputting signals from the detectors. The actuator is operated so as to have the following predetermined opening.

(Operation) The depression position of the accelerator pedal when the throttle valve starts to open from the fully closed position changes depending on the play amount of the accelerator pedal, but the angular position of the rotating body is constant regardless of this play amount. Therefore, the reference adjustments of both detectors are performed so that the signals of the accelerator detector that detects the rotation angle of the rotating body and the throttle detector that detects the opening of the throttle valve match at the fully closed position of the throttle valve. For example, based on the signal from the accelerator detector, it is possible to accurately perform the opening control of the throttle valve via the actuator by the control circuit,
There is no need to readjust both detectors when adjusting the amount of play of the accelerator pedal.

Further, the rotating body can be arranged in the vicinity of the arrangement portion of the throttle valve, so that both detectors can be arranged in close proximity to each other, and the operation of the accelerator pedal at the time of reference adjustment of both detectors ( In the related art, it is not necessary to depress the accelerator pedal to the valve opening start position), which facilitates the adjustment work.

(Embodiment) With reference to FIG. 1, (1) shows an intake passage of a vehicle engine, (2) shows a throttle valve provided in the passage (1), and the vicinity of an arrangement portion of the throttle valve (2). In addition, a rotating body (5) composed of a drum around which a wire (4) connected to an accelerator pedal (3) is wound so that its rotation axis (5a) is parallel to the valve axis (2a) of the throttle valve (2). And a rotation angle (hereinafter referred to as θa) of the rotating body (5) by a mechanical interlocking mechanism (6) axially installed on the rotating body and the slot valve (2) provided between the rotating body (5).
The valve can be opened at an accelerator opening (hereinafter referred to as θb) proportional to

The interlocking mechanism (6) is connected to a first lever (7) integrated with the rotating body (5) and the valve shaft (2a) connected to the first lever (7) via a link (8). The second lever (9) pivotally supported and the coil spring (1
Connection plate (1) fixed to the valve shaft (2a) connected via
1) and, when the accelerator pedal (3) is stepped on, the rotating body (5) passes through the wire (4) against the return spring (5b) in the counterclockwise direction in the drawing. This rotation is caused by the first lever (7), the link (8), the second lever (9) and the coil spring (1).
0) and is transmitted to the connecting plate (11) to rotate the throttle valve (2) counterclockwise to the opening side in the drawing against the return spring (2b).

The connecting plate (11) has a stopper piece (11
In a), the return spring (2b) is applied to the second lever (9) by the tightening force of the coil spring (10) in the counterclockwise direction.
It is adapted to be locked by a stronger force, and in the past, the connecting plate (11) was always allowed to rotate counterclockwise integrally with the second lever (9).

Here, the proportional relationship between θa and θb is determined by the lever ratio between the first lever (7) and the second lever (9), and in the illustrated case, the lever ratio is 1: 1 and the proportional relationship of θa = θb is shown. It was approved.

In the drawing, (12) is a lever (11) formed on the connecting plate (11).
b) shows a third lever pivotally supported at the end of the valve shaft (2a) so as to engage in the clockwise direction, and the third lever (12) is mounted on the output shaft of the actuator (13) composed of a pulse motor. It is made rotatable via the fourth lever (14) and the link (15).

According to this, even if the throttle valve (2) is opened to θb by the interlocking mechanism (6), the actuator (13) causes the third lever (12) to move the third lever (12) to the lever portion (11b).
When the connecting plate (11) is rotated clockwise with the coil spring (10) being wound, the connecting plate (11) is rotated clockwise with respect to the second lever (9), that is, in the valve closing direction. The opening degree of the throttle valve (2) (hereinafter referred to as θth) is reduced to θb or less.

In the drawing, (16) shows a stopper for setting the minimum opening degree for engaging the fourth lever (14) and for restricting the operation in the opening direction.

Also, the rotary shaft (5a) of the rotating body (5) for detecting the θa.
Accelerator detector consisting of encoder connected to (17)
And the valve shaft (2a) of the throttle valve (2) to detect θth.
Slot detector consisting of an encoder coupled to (18)
And the signals from the detectors (17) and (18) and the signal from the negative pressure detector (19) for detecting the intake negative pressure of the engine (hereinafter referred to as P _B ) are input. A control circuit (20) composed of a micro computer is provided, and the operation of the actuator (13) is controlled by the control circuit (20).

By the way, depending on the type of engine, the optimum value of P _B (hereinafter
P _N ) is determined as shown by the line a in Fig. 4, for example, and this P _N
The approximate value of θth (hereinafter referred to as θ _N ) required to obtain is determined as shown in line b in the same figure, and the target value of Ne with respect to θa is also determined as shown in line c in the figure from the required characteristics of the engine. what is, it becomes possible to eventually improve θth as possible the fuel consumption by controlling the Surotsutoru valve (2) so as to theta _N corresponding to the target value of Ne corresponding to the .theta.a.

In this case, the relationship between θa and θ _N is as shown in FIG. 5, for example, and the control circuit (20) causes the actuator (1
It is necessary to operate 3) so that θth becomes θ _N equal to or less than θb.

FIG. 2 shows the overall program of the control circuit (20). The program is started every predetermined time (S ₁ ), then θth, θa, P _B are read and stored (S ₂ ), and then the slot control is performed. The subroutine (S ₃ ) and other control routines (S ₄ ) are executed and ended (S ₅ ), and FIG. 3 shows the details of the slot control subroutine of the program.

In this subroutine, first, S ₁ and S ₂ Metropolitan θ as θa parameters from Figure 4 characteristic writing the table in _N
And P _N are read, then it is determined in S ₃ whether θth is smaller than θb−Δθ, and if “YES” is determined here, S is determined.
Step ₄ is performed and it is determined whether or not θth exists in a certain range around θ _N, that is, θ _N −α ₁ <θ th <θ _N + α ₂ , and the determination result is “ and incremented in S ₅ compares the P _B and P _N if YES ", P _B> P if _N was incremented in S ₆ the actuator (13) to the closing direction, that is, the third lever Rotate the throttle valve (2) to the closing side via (12) Drive clockwise in Fig. 1 to decrease P _B (increase 1 P _B 1)
Is allowed, and P _B> P if _N was incremented in S ₇ the actuator (13) the opening direction, i.e., the first return Surotsutoru valve (2) on the opening side by the biasing force of the coil spring (10) In the figure, drive counterclockwise to increase P _B (decrease 1 P _B 1), P _B = P _N
At that point, proceed to S ₈ and proceed to the actuator (13).
To stop.

Here, the value of θth such that P _B = P _N is θ _N −α ₁ <θth <θ
_If α ₁ and α ₂ are set to, for example, about 8 ° so as to be surely included in the range of _N + α ₂ , and θth does not exist in this range, step S ₄ to S ₉ and θth is θ _N. Determine if it is larger, and if it is larger, proceed to S ₆ and actuate (13)
To the closing direction, and if smaller, to S ₇ to drive the actuator (13) in the opening direction to control the throttle valve (2) so that θth falls within the above range.

In this case, due to the adjustment error of the slot detector (18), θth
The detected value is smaller than the actual [theta] th, a θb and theta actual small value detection value than theta _{N-.alpha. 1} of [theta] th is [theta] th despite the is decreased to θb in a small area of the difference between _N There is a possibility that it will be shown. When doing so, the actuator (13) is driven in the opening direction by going from S ₄ to S ₉ and then to S ₇ , but the throttle valve (2) is driven by θb by the mechanical interlocking mechanism (6). Since the valve is not opened any more than the above, the detected value of θth will be θ even if the actuator (13) is driven in the opening direction.
It does not exceed _N- α _1, and if it is left as it is, the actuator (13) is continuously driven in the opening direction, and the third lever (12) is largely separated in the counterclockwise direction from the lever portion (11b) of the connecting plate (11). Then, after that, when the actuator (13) is driven in the closing direction by the accelerator operation, there is a delay in engagement of the third lever (12) with the lever portion (11b), and the responsiveness deteriorates.

However, the reference adjustment of both the detectors (17) and (18) is made so that the signals from the accelerator detector (17) and the throttle opening detector (18) coincide with each other when the throttle valve (2) is fully closed. That is, when θth becomes θb, the detected value of θth by the throttle detector (18) and the detected value of θb obtained from the detected value of θa by the accelerator detector (17) become almost equal, and the adjustment error If the deviation amount Δθ that allows for the play of the mechanical interlocking mechanism (6) is set to about 1 ° to 2 °, θth
When θ becomes θb, the detected value of θth surely becomes equal to or more than the detected value of θb minus Δθ, and accordingly, it is determined as “NO” in S ₃ and the process proceeds to S 6, and the actuator (13 ) Is driven in the closing direction and the above-mentioned problems do not occur.

(Effects of the Invention) As described above, according to the present invention, a detector that detects a rotation angle of a rotating body that is interlocked with an accelerator pedal and that is connected to a throttle valve through a mechanical interlocking mechanism is used as an accelerator detector. Unlike the conventional one that uses an accelerator detector that detects the amount of depression of the accelerator pedal, the accelerator detector and the slot detector can be arranged in close proximity, and both detectors can be operated independently of the play of the accelerator pedal. The adjustment work can be performed easily, and even if the reference adjustment of both detectors is not performed again when the play amount of the access pedal is adjusted, the opening degree of the throttle valve can be changed to the accelerator opening degree. The following predetermined opening can be accurately controlled, and the maintainability is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of the device of the present invention, and FIG. 2 is a flow chart showing an overall program by a control circuit.
FIG. 4 is a flow chart of the throttle control subroutine, FIG. 4 is a diagram showing required characteristics of the engine, and FIG. 5 is a diagram showing control characteristics of the throttle valve. (2) …… Slottle valve, (3) …… Accelerator pedal (5) …… Rotating body, (6) …… Mechanical interlocking mechanism (13) …… Actuator, (17) …… Accelerator detector (18) ...... Slottle detector, (20) ...... Control circuit

Claims (1)

[Claims] 1. A mechanical interlocking mechanism for opening a throttle valve of a vehicle engine to an accelerator opening proportional to a rotation angle of a rotating body mechanically interlocking with an accelerator pedal, and an opening of the throttle valve for opening the throttle valve. In what is provided with an actuator that can be reduced to an opening or less, an accelerator detector that detects the rotation angle coaxially with the rotating body, and a slot detector that detects the opening coaxially with the throttle valve. A control circuit for inputting signals from both detectors is used to operate the actuator so that the opening of the throttle valve becomes a predetermined opening below the accelerator opening by using the rotation angle of the rotor as a parameter. A vehicle engine throttle control device characterized by: