JPS6125932A - Throttle-valve controller for internal-combustion engine for car - Google Patents

Abstract

PURPOSE:To simplify mechanism and improve control accuracy by operating dash-pot action by deceleration-correcting the control speed determined by a throttle-valve opening-degree control amount setting means when the throttle- valve opening-degree becomes below a prescribed value in engine deceleration. CONSTITUTION:The position of an accelerating pedal A is detected by a detection means B, and an throttle valve C is drive-controlled by a driving means E through a throttle-valve opening-degree control-amount setting means D on the basis of the above-described detected value. A setting means H for setting the standard throttle-valve opening-degree theta1 and a detection means H for detecting the actual throttle-valve opening-degree theta are installed, and the output signals are input into a comparison means I. If theta<theta1 when a deceleration judging means G judges the deceleration of an engine, the control speed set by the setting means D is deceleration-corrected by a deceleration means J. Further, when the cut-off of a clutch K is detected by a detecting means L, develeration correction is released by a deceleration releasing means M.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a throttle valve control device for a vehicle internal combustion engine, and particularly to a device that electronically controls the opening and closing of a throttle valve in response to the accelerator pedal position during deceleration control. Regarding improvements.

(Prior art) Mechanical deceleration control of a throttle valve provided in the intake passage of a vehicle internal combustion engine has been known for a long time.
As shown in the figure. This device connects an accelerator pedal 1 to an accelerator tram 3 with an accelerator wire 2, converts the operation amount of the accelerator pedal 1 into a rotation angle of an accelerator drum 3, and converts the accelerator drum 3 into a throttle valve 5 provided in an intake passage 4. It is attached to the support shaft 6 and controls the opening of the throttle valve 5. The throttle valve opening acts on a part of the accelerator drum 3 in the closing direction, and is configured so as to contact the dashpot 7 near the fully closed position.

In this case, the dashbot 7 has one end of a piston 9 that can slide within the cylinder 8 abut a part of the accelerator drum 3, and the piston 9 is provided with an orifice 9a that communicates with the oil chambers 8a and 8b on both sides thereof. .

Therefore, when a part of the accelerator drum 3 comes into contact with the piston 9 near the fully closed throttle valve 5, the piston 9 moves, but the speed of movement becomes slow due to the throttling action of the orifice 9a.
The closing speed of the throttle valve 5 is reduced. This prevents engine suction negative pressure from becoming excessive during deceleration. If the intake negative pressure becomes excessive during deceleration, the fuel adhering to the walls of the intake passage will vaporize and be sucked into the combustion chamber in large quantities, and the density of the intake air will also decrease, enriching the air-fuel mixture and increasing the amount of H(J, li) in the exhaust gas. This prevents problems such as increased heat, misfire and afterburn, and unpleasant so-called jerky vibrations due to torsional vibrations caused by torque fluctuations.

On the other hand, as opposed to the mechanical throttle valve control device, an electronic throttle valve control device disclosed in, for example, Japanese Patent Laid-Open No. 138235/1980 is known. This device detects the movement of the accelerator pedal as the driver's intention, processes this electronically, and operates the actuator for controlling the throttle valve.There is a mechanical connection between the accelerator pedal and the throttle valve. This excludes linkage.

<Problems to be Solved by the Invention> However, according to the above-mentioned mechanical throttle valve control device, there is variation in the timing of dashpot operation depending on the mounting position of the dashpot, and its installation on site is delicate and difficult. Furthermore, the cushioning effect of the dashpot is
Since it depends on the restriction resistance of the oil flow through the orifice 9a between them, there is a disadvantage that the viscous resistance of the oil changes depending on the temperature, and the characteristics of the Dason Yubosoto effect change.

In addition, according to the electronic throttle valve control device, the dashpot action is created on software, but the mechanical type also works when the throttle valve is slowly closing when the dashbot is operating, that is, during deceleration. When the clutch is disengaged, the throttle valve is activated even though no load is applied to the engine, so the engine speed increases, resulting in inconveniences such as deterioration of fuel efficiency and drivability.

In view of the above-mentioned disadvantages of the conventional art, the present invention provides a throttle valve device in which a dashpot function is incorporated into an electronically controlled throttle valve control device, and when the clutch is disengaged, the dashpot function is canceled and the throttle valve is quickly closed. The purpose is to

<Means for Solving the Problems> To this end, in the present invention, as shown in FIG. In an electronically controlled throttle valve control device in which a throttle valve C is driven by a driving means via a throttle valve opening θ, a throttle valve opening θ detection means F, a means G for determining engine deceleration, and a reference throttle valve opening θ, setting Means H and means I that compare the reference throttle valve opening θ and the detected throttle valve opening θ, when the throttle valve opening θ is in a deceleration state and the throttle valve opening θ is less than or equal to the reference throttle valve opening 01. means J for decelerating the speed controlled by the throttle valve opening control amount setting means; means for detecting disengagement of the clutch; and means for canceling the deceleration correction by the deceleration compensating means when clutch disengagement is detected. M is provided.

As a result, when the engine enters deceleration and the throttle valve opening becomes less than θ1, the control speed determined by the throttle valve opening control amount setting means is decelerated and the dashpot effect is activated. When the clutch is disengaged, the deceleration correction is canceled and the throttle valve is quickly closed to the opening determined by the normal throttle valve opening control amount setting means.

<Example> Embodiments of the present invention will be described below based on the drawings.

In this embodiment, the electronically controlled throttle valve control means is configured using feedback control, and this is shown in FIG.

In the figure, the accelerator position detecting means as a sensor is specifically an accelerator sensor 10 that detects the accelerator opening such as a potentiometer attached to the accelerator pedal, and the throttle valve opening θ detecting means is connected to the intake passage 12. A throttle sensor 15 detects the rotation angle of a step motor (actuator) 14 that rotationally drives a throttle valve 13 installed in the throttle valve 13, and a clutch sensor 16 that detects clutch disengagement is actuated by movement of a clutch pedal. The clutch sensor 16 is designed to output a clutch disengagement signal when the clutch pedal is slightly depressed (when the clutch is not yet completely disengaged).

Accelerator sensor 10. Detection signals from the clutch sensor 16 and throttle sensor 15 are sent to the control unit 17.
and its output signal is output to the step motor 14.

The control unit 17 is constituted by two microcomputers 17A and 17B each including an input/output processing device, a central processing unit, a memory, and the like. 1st
The microcomputer 17A includes each means shown in FIG. 3, and the second microcomputer 17B includes a throttle valve drive means E that outputs drive pulses for the step motor 14 in accordance with instructions from the first microcomputer 17A. is included.

The embodiment of the first microcomputer shown in FIG.
Based on the detection signal of the accelerator position detection means B, a target value θ0 is set by the throttle valve opening target value detection means D1, and the target value θ is set. and the actual throttle valve opening θ outputted by the throttle valve opening θ detecting means F are compared in the comparing means D2 and the deviation is taken, and based on the deviation, the throttle valve opening control amount setting means D3 adjusts the throttle. Calculate and set the control amount of the valve opening.

Next, the operation of this configuration will be explained using the program flow shown in FIG. Although not shown, this flow is activated by the operating system at predetermined time intervals or in synchronization with engine rotation.

At Sl, the position of the accelerator pedal is read based on the detection signal from the accelerator sensor 10.

In S2, the target value θ of the opening degree of the throttle valve 13 corresponding to the accelerator position is determined from the map a stored in the ROM of the microcomputer 17A. Search for.

In S3, RO is activated based on the signal from the throttle sensor 15.
Detected value θ of throttle valve 13 opening from map b stored in M
Load.

In S4, the target value θ is determined in the comparison means D2. and detected value θ
Calculate the deviation Δθ from

In S5, the absolute value 1Δθ1 of the deviation Δθ and the predetermined value Δθ
0, and if 1Δθ1≧ΔθC, the process proceeds to S6, but if 1Δθ1 - Δθ0, the process proceeds to S7, and a hold command signal is output in the same way as the rotation command - with the number of steps 0. This is because if Δθ is a small value within a predetermined range, the throttle valve opening is not controlled to increase or decrease but is set as a dead zone to prevent instability due to hypersensitivity of control.

In S6, the target value θ. Since the deviation Δθ between the detected value θ and the detected value θ is large, the step motor 14 is
The number of steps, that is, the rotating operation angle of the throttle valve is determined based on the deviation ΔθΦ value. (For example, it is determined by searching the map C stored in the ROM based on Δθ or by calculation.) In S8, the step period P+ (see FIG. 5) for normal control of the step motor 14 is set. The operation of setting the number of steps and the step period P (ie, the control M) functions as a throttle valve opening control amount setting means. Here, the step period P can also be referred to as the throttle valve opening control speed.

In S9, the target value θ. It is determined whether the deviation Δθ between the detected value θ and the detected value θ is positive or negative. If it is negative, it is the target value θ. Since the actual throttle valve opening must be decreased toward the engine speed, this judgment functions as the engine deceleration judgment means G. The deceleration determination is not limited to this, and may be determined from the engine rotation speed, etc.

At 510, the deviation Δθ is positive and the target value θ. Since the throttle valve opening degree θ must be increased toward , a command to rotate the step motor 14 in the normal direction is output.

In Sll, when the deviation Δθ is negative, in order to decrease the throttle valve opening θ toward the target value θ0, the step 7 motor 1 is activated.
Outputs a command to reverse 4. The engine is therefore decelerated at this stage.

At 512, the reference throttle valve opening θ1 set by the reference throttle valve opening θ1 setting means H and the detected value θ are compared in the comparing means I, and if the detected value θ is still larger than the reference value θ, Prioritizing the deceleration effect, the step motor 14 is continuously reversed for m (region M in FIG. 5).

As already mentioned, when θ≦θ1 and the detected value θ becomes sufficiently small, the deceleration effect becomes significant, the engine suction negative pressure increases, the mixture tends to become richer, and the so-called jerky vibrations of the vehicle tend to occur. . In this case, if the clutch disconnection detection means detects the clutch engagement state in step 313, the step period of the step motor 14 is increased to P2 in step S14, and the throttle valve opening control speed is reduced to prevent the above-mentioned problem from occurring. This function is the throttle valve opening control speed deceleration means J, and is the area N in FIG. 5 where the squeezing dashbot function is exhibited.

However, if it is found that the clutch is disengaged at S13, the throttle valve is open even though the engine is under no load, so there is a risk that the engine speed will jump, and to prevent this, the Dashbot function must be canceled. The throttle valve opening degree is quickly reduced by returning to the normal step cycle #J4p (0 area in FIG. 5). This function is the throttle valve opening control speed canceling means M.

The control commands for the forward/reverse direction of the step motor, the number of steps, and the step period obtained in this way are outputted to the step motor 14 via the throttle valve driving means E in S15, and the opening degree of the throttle valve 13 is controlled by the accelerator pedal. It will be controlled according to the position.

In the above embodiment, a step motor is used as the actuator of the throttle valve, but a DC servo motor may also be used. The DCC servo morph command information may be added so as to reduce the ratio.

Further, in the above embodiment, the target value θ is used as the throttle valve opening control amount setting means. A feed hack processing method has been exemplified in which the deviation between the detected value θ and the detected value θ is taken and the control is performed in a direction to eliminate it. However, when using the step motor 14 or the like as an actuator, the number of rotation pulses of the step motor can be incremented or decremented by a counter. By doing so, since the rotation angle of the step motor is known, open loop processing can be performed without feedback, and the present invention also includes such a control method.

The engine deceleration determining means may detect a decrease in the amount of accelerator pedal depression in addition to a decrease in the opening degree of the throttle valve.

<Effects of the Invention> As described above, according to the present invention, when detecting the accelerator pedal position and electrically controlling the throttle valve opening, the dashpot effect can be performed when the engine decelerates. Compared to the difficulty of mounting and adjusting the type throttle valve control device, this can be simplified, eliminating inter-individual slippage, and improving control accuracy. Furthermore, even if the clutch is disengaged in the dashbot action area, the dashpot action is immediately released, so the throttle valve is quickly closed, preventing unnecessary engine speed from rising, and improving fuel efficiency and drivability.

[Brief explanation of drawings]

Fig. 1 is a claim correspondence diagram showing the structure of the present invention, Fig. 2 is a block diagram showing one embodiment of the invention, Fig. 3 is a functional block diagram of the same embodiment, and Fig. 4 shows the operation of the same. FIG. 5 is a flowchart, FIG. 5 is a time chart illustrating throttle valve control characteristics based on the above embodiment, and FIG. 6 is a schematic diagram showing an example of a conventional mechanical throttle valve control device. B: Accelerator position detection means C113: Throttle valve D: Throttle valve opening control amount setting means E: Throttle valve driving means F: Throttle valve opening detection means G...
- Engine - deceleration judgment means H... Reference throttle valve opening setting means I... Comparison means J... Throttle valve opening control speed deceleration means K... Clutch... Clutch disengagement detection means 10.・・Accelerator sensor 1
5...Throttle sensor 16...Talasochi sensor 17...Control unit patent applicant Nissan Motor Co., Ltd. agent Patent attorney Fujio SasashimaFigure 6

Claims (1)

[Claims] An accelerator pedal position detection means, a means for setting an opening control amount of a throttle valve provided in an intake system based on a detected value of the detection means, and driving the throttle valve to an opening according to a control signal of the setting means. A throttle valve control device for a vehicle internal combustion engine, comprising: a throttle valve opening θ detection means; a means for determining engine deceleration; a reference throttle valve opening θ_1 setting means;
means for comparing the reference throttle valve opening θ_1 and the detected throttle valve opening θ; and a means for comparing the throttle valve opening θ_1 with the detected throttle valve opening θ; The present invention comprises means for decelerating and correcting the control speed of the throttle valve by the control amount setting means, means for detecting clutch disengagement, and means for canceling the deceleration correction by the deceleration compensating means when clutch disengagement is detected. A throttle valve control device for a vehicle internal combustion engine, characterized by: