JPH03206327A - Throttle valve control device of engine - Google Patents

Abstract

PURPOSE:To eliminate a sticking phenomenon of a throttle valve by providing an electric motor for driving a throttle lever in the direction of closing the throttle valve against a spring and reversely driving the electric motor for a predetermined time, when a predetermined throttle opening corresponding to an accelerator step-in amount is not obtained. CONSTITUTION:In the case of a throttle valve 2 frozen during stopping of an engine in a cold district or the like, a throttle lever 4 is placed in no follow-up action while only a rotary unit 7 rotates against a spring 15 even when an accelerator pedal 17 is strongly pressed down by a driver. When a throttle valve sticking condition, as mentioned, is detected by a control unit 22 being based on output signals of an accelerator sensor 18 and a throttle opening sensor 19, an electric motor 6 is reversely driven for a predetermined time. In this way, the throttle valve 2 is forcedly opened by tension of the spring 15 and torque of the electric motor 6 by rotating a reduction gear 9 through a prime moving gear 5 in the reverse direction to the normal time and by driving the throttle lever 4 through a link plate 12 similarly in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a throttle valve control device for an engine, and more particularly to a throttle valve control device for controlling the output of an automobile engine using an electronically controlled actuator.

[Prior Art] Automotive engines have been known in which the opening and closing of the throttle valve is controlled by an electronically controlled actuator instead of mechanically opening and closing the throttle valve in conjunction with the accelerator pedal. For example, in the method described in Japanese Patent Publication No. 58-25853, an actuator such as a pulse motor is directly connected to a throttle valve, and the output signal of an accelerator sensor that detects the amount of depression of the accelerator pedal and the opening degree of the throttle valve are detected. The actuator is controlled by a control circuit inputting the output signal of the throttle opening sensor to open the throttle valve with desired opening characteristics. However, if an attempt is made to open and close the throttle valve completely by electronic control, problems arise such as the configuration of the control circuit becoming complicated. Therefore, devices that use both a mechanical interlocking mechanism and an electronically controlled actuator have been proposed. For example, what is described in JP-A-63-167036 includes a mechanical interlocking mechanism that opens the throttle valve at an accelerator opening proportional to the rotation angle of a rotating body that is mechanically interlocked with the accelerator pedal; and an actuator capable of reducing the opening degree to below the accelerator opening degree, the opening degree of the throttle valve is controlled according to a desired opening characteristic below the accelerator opening degree, and the actuator is actuated during deceleration to reduce the throttle valve opening degree. The valve is forced to close. Furthermore, in the device described in Japanese Patent Publication No. 54-2449, a control lever (throttle lever) connected to a throttle valve and biased by a spring so as to be engaged with an accelerator means is moved against the biasing force of the spring. It is equipped with a servo motor that drives the throttle valve in the closing direction, and when there is no difference in rotational speed between the driving wheels and driven wheels, the throttle valve is controlled mechanically in conjunction with accelerator operation, and the driving wheels and driven wheels are When a difference in rotational speed occurs, the servo motor is operated to drive the throttle lever in the throttle valve closing direction to prevent the drive wheels from idling.

[Problem to be Solved by the Invention] By the way, the latter prior art described above, that is,
-As disclosed in Japanese Patent Publication No. 167036, Japanese Patent Publication No. 54-2449, etc., the opening of a throttle valve driven by a mechanical interlocking mechanism is controlled to be less than the accelerator opening by an electronic control actuator. In the , a spring is used to lock the throttle lever to the accelerator means, and for this reason, for example, when the engine is stopped, gum-like substances may adhere between the rotating shaft of the throttle valve and the bearing, or If the throttle valve freezes while the vehicle is stopped and a large torque is required to open the throttle valve, apply a torque to the throttle valve that exceeds the locking force of the spring even if the accelerator pedal is depressed. There is a problem that the throttle valve will not open if the throttle valve cannot be opened. Furthermore, if the locking force of the spring is increased to make it easier to open the throttle valve, a large actuator will be required to overcome this locking force, which will increase costs. There are problems such as an increase in power consumption.

This invention was made to solve the above problems, and even if the locking force of the spring that locks the throttle lever to the accelerator means is small, the throttle valve becomes difficult to open due to freezing etc. An object of the present invention is to obtain a throttle valve control device for an engine that can sometimes apply a large torque to a throttle valve.

[Means for Solving the Problems] A throttle valve control device for an engine according to the present invention controls a throttle lever, which is biased by a spring so as to be engaged with an accelerator, against the biasing force of the spring to control the throttle valve. A vehicle equipped with an electric motor driven in a closing direction, a throttle opening sensor that detects the opening of a throttle valve, an accelerator sensor that detects the amount of depression of an accelerator pedal,
Upon receiving the detection signals from the throttle opening sensor and the accelerator sensor, if the throttle valve opening corresponding to the amount of depression of the accelerator pedal cannot be obtained, a reversing drive means is activated to drive the throttle valve in the opening direction in the reverse direction using the electric motor for a predetermined period of time. It was established.

[Operation 1] In this invention, when the throttle valve does not open in response to the amount of depression of the accelerator pedal due to freezing etc., the electric motor is reversely driven in the throttle valve opening direction for a predetermined period of time, and the resulting torque is applied to the biasing force of the spring. By applying force to the throttle valve, a large torque is applied to the throttle valve, causing the throttle to open.

[Example] Examples will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention applied to a throttle valve control device having a slip prevention mechanism during driving of an automobile similar to that described in the above-mentioned Japanese Patent Publication No. 54-2449.

In this embodiment, a throttle valve (2) is provided in the air intake pipe (1) of the engine, and a throttle lever (4) is fixedly attached to one end of the valve shaft (3) of the throttle valve (2). ing. A driving gear (5) is disposed coaxially with the valve shaft (3), and the output shaft of an electric motor (6) fixed to the air suction pipe (1) is drivingly connected to this driving gear (5). ing. Further, a plate-shaped rotating body (7) is rotatably provided on the valve shaft (3). A gear shaft (8) is fixed on this rotating body (7) at a position away from the shaft center, and a reduction gear that is driven by meshing with the driving gear (5) is attached to the gear shaft (8). (9) is rotatably arranged. Further, a connecting pin (IO) is fixed to the outer edge of this reduction gear (9), while a throttle lever (4)
A link pin (11) is also fixed to the end of the link, and the reduction gear (9) and throttle lever (4) are rotatably connected to the respective link pins (10) and (11). They are interconnected by plates (l2). and,
As shown in Figure 2 (cross-sectional view taken along the line ■-■ in Figure I), the throttle lever (4) is provided with a rotation range limiting window (4a) that extends a predetermined distance in the circumferential direction, and A stopper pin (l3) is installed corresponding to the rotation range limiting window (4a).
) is permanently installed. One end of the rotation range limiting window (4a) comes into contact with the stopper pin (l3), thereby limiting the rotation range of the throttle lever (4) with respect to the rotating body (7).

One end of a return spring (l4) is held on the side surface of the rotating body (7). This return spring (l4
) is held at its other end on the air intake pipe (1) side, thereby applying torque to the rotating body (7) in the direction of returning the throttle valve (2) to the closed position. It is applied to the valve stem (3) via the stopper pin (13) and the throttle lever (4). Also,
One end of another spring (15) is held on the side of the rotating body (7) opposite to the side holding the return spring (14). This spring (15) is held at the other end by the throttle lever (4), thereby
The throttle lever (4) is biased in the direction of contacting the stopper pin (l3) (in the direction opposite to the arrow A in Fig. 2) to lock the throttle lever (4) to the rotating body (7). are doing.

An accelerator wire (16) is hung in a groove (7a) on the outer periphery of the rotating body (7), and the other end of this accelerator wire (16) is connected to an accelerator pedal (17). When the accelerator pedal (17) is depressed, the rotating body (7) rotates against the spring force of the return spring (l4), opening the throttle valve (2) via the reduction gear (9) and throttle lever (4). Rotate the valve stem (3) in the direction.

An accelerator sensor (18) that detects the amount of depression of the accelerator pedal (l7) is attached to the accelerator pedal (l7) operated by the driver. In addition, the throttle valve (
A throttle opening sensor (19) for detecting the opening of the throttle valve (2) is attached to the valve shaft (3) of 2).

Furthermore, the automobile (not shown) is provided with a driving wheel speed sensor (20) that detects the rotational speed of the driving wheels and a driven wheel speed sensor (2l) that detects the rotational speed of the driven wheels. Input the respective output signals of the speed sensor (20), the driven wheel speed sensor (2l), the accelerator sensor (l8) and the throttle opening sensor (l9),
A control unit (22) is provided that performs predetermined arithmetic processing in response to the input information to drive and control the electric motor (6).

The operation of the apparatus of this embodiment configured as above will be explained.

When the driver depresses the accelerator pedal (17), the accelerator wire (l6) causes the accelerator pedal (l7) to
) rotates against the return spring (l4), and as a result, the reduction gear (9) rotates against the return spring (l4).
), link plate (1 2), throttle lever (4),
The throttle valve (2) rotates integrally via the valve shaft (3). Furthermore, when the amount of depression of the accelerator pedal (17) is reduced, the rotating body (7) is
) rotates in the opposite direction, resulting in the throttle valve (2) rotating towards the closed position. When there is no difference in rotational speed between the driving wheels and the driven wheels, press the accelerator pedal (1) in this way.
The throttle valve (2) is opened and closed in conjunction with the operation of step 7).

On the other hand, the control unit (22) detects that the driving wheel is idling and there is a difference in rotational speed with the driven wheel based on the output signals of the driving wheel speed sensor (20) and the driven wheel speed sensor (2l). At this time, the electric motor (6) is driven in the forward direction by a control signal from the control unit (22). This rotation of the electric motor (6) causes the reduction gear (9) to rotate in the direction of arrow B in FIG. 2 via the drive gear (5), thereby causing the link plate (l2) to
The throttle lever (4) is rotated in the direction of arrow A against the biasing force of the spring (15), and the throttle valve (2) is driven to the closing side.

As a result, the engine output is reduced, the drive torque of the drive wheels is reduced, and the wheels are prevented from spinning.

In addition, if the throttle valve (2) freezes while the engine is stopped in a cold region, etc., the driver may press the accelerator pedal (l7).
Even if you press down hard, only the rotating body (7) will hold the spring (l).
If the throttle lever (4) rotates in the direction opposite to arrow A in Fig. 2 against the biasing force of 5), the throttle lever (4) will rotate even though the accelerator pedal (l7) is depressed. (2) The accelerator sensor (l) indicates that the valve does not open.
8) and the throttle opening sensor (19), the control unit (22) detects the output signal, and in response to the control signal from the control unit (22), the electric motor (6)
) is driven in reverse for a predetermined period of time (for example, 1 second). As a result, the reduction gear (9) is driven via the drive gear (5) in the direction opposite to arrow B in FIG. 2, and the throttle lever (
4) is driven in the direction opposite to arrow A via the link plate (12), and torque in the opening direction is applied to the throttle valve (2). Therefore, at this time, the throttle lever (4
) is subjected to a large torque, which is the sum of the torque from the accelerator pedal (17) applied via the spring (l5) and the torque from the reverse drive of the electric motor (6), which causes the door to open due to freezing, etc. The throttle valve becomes difficult to open. Further, once the throttle valve (2) is opened in this way, it can be operated with a small torque, and since it is warmed by the engine after starting, it will not freeze again. Therefore, the electric motor (6) can be driven in reverse in a relatively short time.

Next, the operating procedure of the control unit (22) that controls the reverse drive of the electric motor (6) will be explained with reference to the flowchart shown in FIG.

The operation starts at the same time as the engine is started, and first, a detection signal of the accelerator pedal operation amount is read from the accelerator sensor (18) (step 10l).

Next, a detection signal of the throttle valve opening is read from the throttle opening sensor (l9) (step 102). Then, it is determined whether the throttle opening signal is a predetermined throttle opening signal corresponding to the accelerator sensor signal when the accelerator pedal (17) is operated, that is, the accelerator pedal (l7)
It is determined whether the throttle valve (2) is opened by the operation (step l03).

If the throttle valve (2) does not open, the electric motor (
6), a drive signal is output, and the drive is driven in reverse for a predetermined period of time (for example, 1 second) (step 104).

This operation is repeated until the throttle valve (2) is opened.

Then, the throttle opening signal is output from the accelerator pedal (l).
If it corresponds to the operation 7), then the electric motor (6) is prohibited from being driven in reverse until the engine is stopped (step l05).

As described above, the operation of controlling the reverse drive of the electric motor (6) is executed when the accelerator pedal (17) is first depressed after the engine is started, and once the throttle valve is opened, it does not operate until the engine is stopped.

[Effects of the Invention] As described above, according to the present invention, the throttle lever, which is connected to the throttle valve and urged by a spring so as to be engaged with the accelerator means, is moved in the throttle valve closing direction against the urging force of the spring. When a predetermined throttle opening corresponding to the amount of accelerator pedal depression cannot be obtained, the motor is driven in reverse for a predetermined period of time to apply torque in the opening direction to the throttle valve. Even if the locking force of the spring that locks the lever to the accelerator is small, a large torque is applied to the throttle valve when the throttle valve is difficult to open due to adhesion of gummy substances or freezing while the engine is stopped. In addition, the throttle valve can be opened easily.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of an embodiment of a throttle valve control device according to the present invention, Fig. 2 is a cross-sectional view taken along the line -■ in Fig. . In the figure, (2) is the throttle valve, (4) is the throttle lever, (6) is the electric motor, (7) is the rotating body, and (14) is the throttle lever.
is the return spring, (15) is the spring, (l7
) is the accelerator pedal, (l8) is the accelerator sensor, (1
9) is a throttle opening sensor, and (22) is a control unit.

Claims (1)

[Claims] (1) Throttle valve control for an engine equipped with an electric motor that drives a throttle lever connected to the throttle valve and biased by a spring to engage the accelerator means in the throttle valve closing direction against the biasing force of the spring. The device includes a throttle opening sensor that detects the opening of the throttle valve, an accelerator sensor that detects the amount of accelerator pedal depression, and a sensor that receives detection signals from these throttle opening sensors and accelerator sensors and responds to the amount of accelerator pedal depression. 1. A throttle valve control device for an engine, characterized in that a reversal drive means is provided for driving the throttle valve in the reverse direction in the opening direction for a predetermined period of time by the electric motor when the throttle valve opening cannot be obtained.