JPH02188635A - Electronic controlling throttle valve control device - Google Patents

Abstract

PURPOSE:To prevent fastening of a throttle valve at the time of cooling engine by providing a throttle valve adjusting means which is operated when a key switch is set off or an accessory is set and returns a throttle valve totally closed by means of a returning spring to an opening condition a little. CONSTITUTION:A motor actuator 11 is integrally connected to one end of a rotational shaft 10a of a throttle valve 10, while a throttle opening sensor 10 is provided on the other end of the rotational shaft 10a. The motor actuator 11 is driven and controlled by a control unit 14 according to an output signal 121 or an acclerator opening signal 120, etc., of the opening sensor 12. The throttle valve 10 is entirely closed by means of a returning spring 11b when a key switch 13 is set OFF or an accessory is set. The throttle valve 15 is a little returned to an opening condition by means of a throttle valve adjusting means 15. The adjusting means 15 is composed of a solenoid which attracts a movable element 15b against a returning spring 15c with the electric supply to a coil 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a throttle valve control device that has excellent opening/closing control performance of a throttle valve that adjusts the output of an internal combustion engine.

(Prior Art) Conventionally, as a throttle valve control device for electronic control that controls the opening and closing of the intake air amount to an internal combustion engine and adjusts the output of the internal combustion engine, the one shown in FIG. 9 has been known. There is.

That is, as shown in the figure, the throttle valve 1 disposed in the intake pipe 7 is controlled to open and close according to the amount of depression of the accelerator pedal (not shown), but this type of throttle valve 1 is not designed for electronic control. , a motor drive signal 5a from the control unit 4 based on the human power signal 3 from the throttle valve opening sensor 2, etc.

5b is sent out, thereby driving the motor actuator 5 against the biasing force of the return spring 6 to control the opening and closing of the throttle valve 1.

Further, this throttle valve 1 is connected to a motor actuator 5.
When OFF, the return action of the biasing force of the return spring 6 brings it into a fully closed state.

Thus, when the engine is stopped, the motor actuator 5 is turned off and the throttle valve 1 is fully closed to be in a standby state for restarting the engine.

(Problem to be Solved by the Invention) By the way, blow-by gas and gum contained in gasoline adhere to the area around the throttle valve 1 due to engine blowback, so when the engine is stopped, the throttle valve 1 is The gummy substance adhering to the surrounding area solidifies (see the x mark in FIG. 8(a)).

Therefore, the outer peripheral portion 1a of the throttle valve 1 in the fully closed state
Due to the gum solidified between the wall surface 7a of the intake pipe 7 and the intake pipe 7, there is a problem in that the throttle valve 1 does not open when the engine is started in cold weather.

Of course, even in the above case, if the throttle valve 1 is opened with a strong force, the sticking state due to the gum will be released, and the opening and closing of the throttle valve 1 can then be smoothly controlled. However, it is not possible to release the sticky state caused by the gum unless a motor actuator with a higher output than usual is used, and the motor actuator and the like are also subject to high wear and tear.

In order to solve the above-mentioned problems, the throttle valve 1 is kept slightly open rather than completely closed until the engine is stopped and restarted. It is necessary to prevent the motor actuator 5 from becoming stuck to the wall surface 7a of the intake pipe 7, but in this case, the motor actuator 5 is a return spring that urges the throttle valve 1 to the fully closed state even when the engine is stopped. Pull the throttle valve l to the desired opening degree against the urging force of 6,
Since it is necessary to operate to restore the current state and maintain this state, there are problems in terms of complexity of control method, control reliability, cost, etc.

This invention was made in view of the above-mentioned circumstances, and its purpose is to achieve a fully closed state when the engine is stopped without using a throttle valve opening/closing drive mechanism, that is, a motor actuator and a return spring. An object of the present invention is to provide an electronically controlled throttle valve control device that can slightly open a throttle valve and has excellent throttle valve opening/closing control performance during engine starting.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention controls the opening and closing of the intake air amount to the internal combustion engine to adjust the output of the internal combustion engine, and when the engine is stopped, the output is adjusted by a return spring. a throttle valve that is in a fully closed state; a motor actuator that drives the rotating shaft of the throttle valve; a throttle valve opening sensor that detects the opening of the two-constant throttle valve; and an opening sensor that detects the opening of the throttle valve. A control unit for electronic control that sends a drive signal to the motor actuator based on a degree signal etc. to control the degree of opening of the throttle valve; The throttle valve, which is in the operating state and fully closed by the return spring, is pushed back and adjusted to a slightly open state, and when the key switch is set to start or the ignition is set, the throttle valve is in the inactive state, and the throttle valve is opened and closed by the motor actuator. and a throttle valve adjustment control means that can be controlled by a return spring.

(Function) With the above configuration, the throttle valve, which is fully closed when the engine is stopped, can be operated without using a motor actuator and a return spring, which are the opening/closing drive mechanism of the throttle valve, that is, through the throttle valve adjustment control means. It can be adjusted to a slightly open state.

Furthermore, when the engine is started, the throttle valve adjustment control means is immediately released to a non-operating state, and the motor actuator and return spring are operated normally to control opening and closing of the throttle valve.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic basic configuration diagram of an embodiment of the present invention, and as shown in the figure, this device includes at least a throttle valve 10 that adjusts the intake air amount to an internal combustion engine, and a rotation shaft of the throttle valve 10. A motor actuator 11 integrally connected to the rotating shaft 10a of the throttle valve 10
A control unit that sends a drive current 122 to the motor actuator 11 based on a throttle valve opening sensor 12 provided at the other end, a human power signal 121 from the throttle valve opening sensor 12, an accelerator opening signal 120 (θr), etc. The unit 14 and the throttle valve 10 are the key switch 13
The throttle valve adjustment control means 15 pushes back the throttle valve 10, which is fully closed by a return spring llb, to a slightly open state when the controller is turned off or accessories are set.

The motor actuator 11 drives the rotating shaft 10a via a gear lla to open and close the throttle valve 10.

Further, the specific configuration of the throttle valve adjustment control means 15 is as follows:
It is structured as follows.

That is, as shown in FIG. 2, the movable element 15b is formed of a solenoid that is electromagnetically attracted into the coil 15a against the biasing force of the return spring 15c when the coil 15a is energized (FIG. 2(a)).

Furthermore, when the coil 15a is de-energized, the movable element 15b is moved from the coil 15 by the biasing force of the return spring 15c.
It protrudes outside a ((b) in the same figure).

For this reason, the lever 15 attached to the rotating shaft 10a
d is pushed back via the protruding mover 15b when the power is not energized, so that the throttle valve 10 is slightly opened (FIGS. 2(b) and 3(b)).

Since the movable element 15b is drawn into the coil 15a when energized, the throttle valve 10 can be controlled to open and close by the motor actuator 11 and the return spring Ilb (FIGS. 2(a) and 3(b)).

Further, in this type of throttle valve control device, as shown in FIG.
It is constructed with an idling control means 16 provided with an idling control valve 16b at a.

Therefore, the opening/closing control operation of the throttle valve based on FIG. 5 will be explained with reference to the flowchart shown in FIG.

When the key switch 13 is set and the opening/closing control operation of the throttle valve 1O starts, it is determined whether the engine is running (step 301), that is, the key switch 13 is turned on, but the engine is not running. state (key switch 13 is simply set, or when setting accessories), or key switch 13 is set when setting ignition or start, and the engine is running. It is judged whether

If it is determined that the engine is not running, the solenoid 15 is turned off (step 30).
2). That is, since the coil 15a is de-energized, the movable element 15b urged by the return spring 15c presses the throttle valve 10 to slightly open it.

Further, if it is determined in step 301 that the engine is running, the solenoid 15 is turned on (step 303). That is, since the coil 15a is energized, the movable element 15b is drawn into the coil 15a by electromagnetic attraction against the urging force of the return spring 15c.

As a result, the throttle valve 10 becomes openable and closable by the motor actuator 11 and return spring llb, and enters the idle control state (step 304).
).

Next, it is determined whether or not the drive wheels are moving (step 305), and if it is determined that they are not moving, the process returns to step 301 after idling control. Furthermore, when it is determined that the engine is running, throttle valve opening control is performed. Note that the above determination is made based on the signal 123 from the crank angle sensor 17.

Therefore, the operation of the entire control system in this embodiment is as follows:
The flowchart 1 shown in FIG. 6 is as shown in FIG.

First, when the key switch 13 is turned on (step 40
1), solenoid 15 is turned on (step 402)
, the slightly open state of the throttle valve 10 is released and the throttle valve 10 is brought into a fully closed state (step 403).

Then, when the engine is started (step 404),
Idle rotation speed control is performed (step 405).

Further, after the idle speed control is performed or the throttle valve opening/closing control is performed (after running), the engine is stopped (step 407), the key switch 13 is turned off in step 408, and then the solenoid is turned off in step 409. is turned OFF, the engine is stopped, and a slight opening degree of the throttle valve 10 when the throttle valve is fully closed is ensured (step 410).

Note that the calculation control for opening and closing the throttle valve 10 is performed as shown in FIG.

In order to make the throttle valve opening signal 121 equal to the throttle valve command opening signal 120, the control unit 14 uses the throttle valve command opening signal 120 outputted from a throttle valve command opening calculation section (not shown) to
A value obtained by multiplying the value obtained by subtracting the throttle valve opening signal 121 by the proportional gain KP, and a value obtained by multiplying the value obtained by integrating the above value by the integral gain Ki are obtained, and a total value of these is obtained, and further, The value of the throttle valve opening signal 121 is differentiated with respect to this total value, and the value multiplied by the differential gain KV is subtracted to obtain the drive value. Based on this drive value, a drive current is sent from the drive circuit section to drive the motor actuator. 11.

As described above, in this embodiment, the throttle valve 10, which is fully closed when the engine is stopped, is operated without using the motor actuator 11 and the return spring Ilb, which are the drive mechanism of the throttle valve 10 (the throttle valve adjustment control means 15, it can be adjusted to a slightly open state.

Furthermore, when starting the engine, the throttle valve control adjustment means is immediately released to a non-operating state, and the motor actuator and return spring can maintain the idle speed as usual, and furthermore, the opening and closing of the throttle valve can be controlled.

(Effects of the Invention) As explained above, according to the present invention, the throttle valve, which is activated when the key switch is turned off to stop the engine or when an accessory is set, is pushed back and is fully closed by the return spring. Throttle valve adjustment control that adjusts the throttle valve to a slightly open state, but remains inactive at the start setting value or ignition setting value of the key switch when the engine is running, and allows the opening and closing of the throttle valve to be adjusted by a motor actuator and a return spring. Since the structure is configured to include a means, the throttle valve, which is fully closed when the engine is stopped, can be slightly opened without using the throttle valve opening/closing drive mechanism, which is a motor actuator and a return spring. Since the throttle valve is not stuck even when the gum solidifies, it is possible to provide an electronically controlled throttle valve control device that has excellent throttle valve opening/closing control performance during engine startup.

In addition, the configuration does not use a motor actuator and a return spring, which are the opening/closing drive mechanism of the throttle valve, but instead uses a separate throttle valve adjustment control means to slightly open the throttle valve, which increases the complexity of the control system and increases the control efficiency. It has excellent effects in terms of reliability and cost.

[Brief explanation of the drawing]

Figure 1 is a schematic basic configuration diagram of this invention, Figure 2 (a
)(b) is an explanatory sectional view showing the operating state of the throttle valve adjustment control means, FIGS. 3(a) and 3(b) are explanatory plan views showing the operation of the throttle valve by the throttle valve adjustment control means, and FIG. 5 is a flowchart showing the operation of the invention, FIG. 6 is a flowchart showing the entire control system of the invention, and FIG. 7 is a diagram showing throttle valve control. 8(a) and 8(b) are plan views showing the external appearance of the throttle valve control device, and FIG. 9 is a schematic basic configuration diagram showing the conventional throttle valve control device. 10...Throttle valve 11...Motor actuator 12...Throttle valve opening sensor 13...Key switch 14...Control unit 15...Throttle valve adjustment control means Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. a throttle valve that controls the opening and closing of an intake air amount to an internal combustion engine to adjust the output of the internal combustion engine, and is fully closed by a return spring when the engine is stopped; a motor actuator that drives a rotating shaft of the throttle valve; a throttle valve opening sensor that detects the opening of the throttle valve; and an electronic device that sends a drive signal to the motor actuator based on the opening signal from the throttle valve opening sensor and controls the opening of the throttle valve. In a throttle valve control device equipped with a control unit for control, and when a key switch is turned off or an accessory is set, the throttle valve is activated and is fully closed by a return spring, and the throttle valve is pushed back and adjusted to a slightly open position. An electronically controlled throttle valve characterized by having a throttle valve adjustment control means which is inactive when a key switch is set to start or when an ignition is set, and which enables opening and closing of the throttle valve to be controlled by a motor actuator and a return spring. Control device.