JPH04276143A - Throttle valve controller for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control device for an internal combustion engine, and more particularly, to a throttle valve control device for an internal combustion engine that can prevent the throttle valve from closing more than a target opening during deceleration during deceleration operation. Regarding equipment.

0002

2. Description of the Related Art Some internal combustion engines for vehicles are equipped with a throttle valve control device that forcibly controls opening and closing of a throttle valve during a specific operation.

This throttle valve control device uses a single valve opening/closing motor to open and close the throttle valve during specific operations, such as fast idle control, idle speed control, and dashpot control to prevent sudden closing of the throttle valve. There is something to control. That is, FIG.
As shown, an intake passage 204 communicating with the internal combustion engine 202
A throttle valve 208 fixed to the throttle shaft 206 is disposed inside the throttle shaft 206, and a throttle sensor 210 is provided at one end of the throttle shaft 206 to detect the opening/closing state of the throttle valve 208, that is, the throttle opening degree. A throttle guide 212 is connected to the other end, an accelerator wire 214 connected to an accelerator pedal (not shown) is connected to one side of the throttle guide 212, and a valve is connected to the other end of the throttle guide 212. An opening/closing motor (DC motor) 216 is provided. This valve opening/closing motor 216 has an idle switch 2 at its tip that detects whether or not the internal combustion engine 202 is in idle operation and turns it on and off by the operation of the throttle guide 212.
18, and a throttle position sensor 220 is built in to detect the position of the throttle valve 208 by the valve opening/closing motor 216.

The throttle sensor 210, valve opening/closing motor 216, idle switch 218, and throttle position sensor 220 are connected to a control means 222. This control means 222 includes the throttle sensor 2
10 etc., the valve opening/closing motor 216 is driven and controlled, and the throttle valve 208
It opens and closes the door properly.

[0005] Such a throttle valve control device is disclosed in, for example, Japanese Patent Laid-Open No. 64-69724. The device described in this publication focuses on the fact that the stem on the dashpot side and the lever on the throttle valve side are in contact with each other below the throttle valve's set opening, and the dashpot is equipped with an idle-up function. It is.

[0006]

[Problems to be Solved by the Invention] By the way, a throttle valve control device that controls the opening and closing of a throttle valve using a valve opening/closing motor does not have a throttle position sensor (the position of the motor, that is, the position of the fully open accelerator). In some cases, a throttle sensor (throttle opening) is used to detect the position of the valve opening/closing motor.
Since the position of the valve opening/closing motor cannot be obtained as information only when the idle switch is on, and in order to perform dashpot control during deceleration operation, The throttle valve must be opened when the idle switch is on and the vehicle speed > 0), but the idle switch must be turned on once to detect the deceleration state, so the throttle valve opens as shown in Figure 7. In other words, in Figure 7, when the engine speed is decelerated from 4000 rpm in 2nd gear, the target opening during deceleration during deceleration operation is set to 4 degrees. However, when transitioning from steady operation to deceleration operation, the throttle opening once drops to the idle opening (2 degrees), resulting in a problem such as deterioration of exhaust gas.

Further, as shown in FIG. 6, when a throttle position sensor is built into the valve opening/closing motor, the structure of the valve opening/closing motor becomes complicated, which is disadvantageous in terms of cost.

[0008]

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an idle switch that detects whether or not the internal combustion engine is idling and turns it on and off, and specifies the internal combustion engine. In a throttle valve control device for an internal combustion engine, which is provided with a valve opening/closing motor that controls the opening and closing of the throttle valve during operation, an acceleration operation in which the throttle valve is opened more than a target opening during deceleration set from an idling opening to the opening side. and a deceleration operation in which the throttle valve is closed from a throttle opening larger than the target opening during deceleration to the target opening during deceleration. The present invention is characterized in that a control means is provided for driving and controlling the valve opening/closing motor to prevent the valve from closing more than the target opening degree during deceleration.

[0009]

[Operation] According to the configuration of the present invention, the control means controls the acceleration operation in which the throttle valve is opened more than the target opening degree during deceleration set from the idle opening degree to the opening side, and the throttle valve opening larger than the target opening degree during deceleration. In order to prevent the throttle valve from operating closer than the target opening during deceleration after a predetermined waiting time has elapsed from the start of at least one of the deceleration operation in which the throttle valve is closed from the opening to the target opening during deceleration. The valve opening/closing motor is controlled for a predetermined driving time. As a result, during deceleration operation, the throttle valve is opened more than the target opening degree during deceleration, so the throttle valve does not close more than the target opening degree during deceleration, and therefore the dashpot function can be properly performed. It is possible to prevent deterioration of emissions and occurrence of engine stall.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail and specifically below with reference to the drawings. 1 to 5 show embodiments of this invention. In FIG. 1, 2 is an internal combustion engine, 4 is an internal combustion engine, and 4 is an internal combustion engine.
1 is a throttle control device, 6 is an intake passage, and 8 is a throttle valve. This throttle valve 8 is fixed to a throttle shaft 10. A throttle sensor 12 is provided at one end of the throttle shaft 10 . Further, a throttle guide 14 is connected to the other end of the throttle shaft 10. A throttle wire 16 connected to an accelerator pedal (not shown) is attached to one side of the throttle guide 14. Further, on the other side of the throttle guide 14, a valve opening/closing motor 16 is arranged.

The valve opening/closing motor 16 controls the opening/closing of the throttle valve 8 when the internal combustion engine 2 is operating in a particular manner, for example during deceleration operation. This valve opening/closing motor 16 includes an idle switch 1 that detects whether or not the internal combustion engine 2 is in idling operation based on the opening/closing state of the throttle valve 8 depending on the operating state of the throttle opening 14 and turns on/off the engine.
8 is provided at the tip.

The throttle sensor 12, the valve opening/closing motor 16, and the idle switch 16 are controlled by a control means (EC
U)20 has been contacted. Further, this control means 20 is connected to a cooling water temperature sensor 22, a vehicle speed sensor 24, and the like.

This control means 20 operates during acceleration operation in which the throttle valve 8 is opened more than the target opening degree during deceleration set to the opening side from the idle opening degree, and during deceleration from the throttle opening degree larger than the target opening degree during deceleration. After a predetermined standby time has elapsed from the start of at least one of the deceleration operation in which the throttle valve 8 is closed to the target opening side, the valve opening/closing valve is used to prevent the throttle valve 8 from closing more than the target opening during deceleration. It drives and controls the motor 16.

More specifically, as shown in FIG. 3, the control means is operated at an accelerating rate when the idle switch 18 is turned from on to off (shown in position a), and then the idle switch 1
During deceleration operation in which valve 8 changes from off to on (indicated by position b), when the predetermined standby time (VWT) has elapsed from the start of this deceleration operation (position b) (position c), the valve opening/closing motor 1
6 is the predetermined driving time (TTW) from position c to position d.
T) is actuated to operate the throttle valve 8 toward the opening side.

Further, the control means 20, as shown in FIG.
Idle switch 18 goes from on to off (indicated by position e)
When the acceleration operation is started, after the predetermined standby time (VWT) from position e to f has elapsed, the valve opening/closing motor 16 is operated for a predetermined drive time (TTW) from the deceleration operation h to position i.
T) is controlled and the throttle valve 8 is activated during deceleration operation.
This prevents the valve from closing more than the target opening degree during deceleration.

Furthermore, in this control means 20, FIG.
As shown in FIG. 2, the drive time (TTWT) of the valve opening/closing motor 16 can be changed depending on the cooling water temperature (THW) state.

Next, control of the throttle valve 8 during deceleration operation will be explained based on the flow chart of FIG. 2 and the time chart of FIG. 3.

In the control means 20, when the internal combustion engine 2 starts operating and the program starts (step 102), first, the idle switch 18 is turned on and off, the vehicle speed is detected from the vehicle speed sensor 24, and the vehicle speed is detected from the cooling water temperature sensor 22. Cooling water temperature, etc. are input.

Then, it is determined whether the idle switch 18 has been switched from on to off (step 106).

When the idle switch 18 turns from on to off and step 106 becomes YES (position a in FIG. 3), the throttle opening just before the idle switch 18 turns off is lower than the target opening during deceleration. It is determined whether or not it is smaller (step 108).

[0021] If YES in this step 108,
It is determined that the vehicle is accelerating. Then, the idle switch 18 is turned on from off (position b in Fig. 3), that is, deceleration operation starts, and from this deceleration operation, a predetermined standby time (V
WT) (position c in Figure 3), the valve opening/closing motor 16 is energized for a predetermined driving time (TTWT) (sec) (from position c to position d in Figure 3) to open the throttle valve 8 (step 110), and end (step 1
12).

Further, as shown in FIG. 4, the predetermined drive time (TTWT) (sec) of the valve opening/closing motor 16 is divided depending on the state of the cooling water temperature (THW), for example, with the border of zero temperature. If the temperature is below zero (-A
1), if the cooling water temperature is higher than zero (+A2
), the valve control motor 16 can be controlled more precisely.

Furthermore, as shown in FIG. 5, when the idle switch 18 goes from on to off (indicated by position e) during acceleration operation, after a predetermined standby time (VWT) has elapsed from position e, Control the drive of the valve opening/closing motor 16 for a predetermined driving time (TTWT) to the i position, and energize the valve opening/closing motor 16 so that the throttle valve 8 does not close more than the target opening during deceleration during deceleration operation. For example, since the throttle valve 8 is opened more than the target opening degree during deceleration, the throttle valve 8 will not be closed once more than the target opening degree during deceleration when the vehicle shifts to deceleration operation.

According to the control of the throttle valve 8 shown in FIG. 5, the valve opening/closing motor 16 is driven after a predetermined waiting time (VWT) has elapsed after the idle switch 18 is turned from on to off, so that the vehicle does not jump out. This can prevent problems from occurring.

As a result, during deceleration operation, the throttle valve 8 is opened more than the target opening degree during deceleration, so the throttle valve 8 does not close more than the target opening degree during deceleration, and therefore the dashpot function is not activated. This can be carried out appropriately and prevent the deterioration of emissions and the occurrence of engine stalls.

Furthermore, since there is no need to incorporate a throttle positioner sensor into the valve opening/closing motor 16, the configuration of the valve opening/closing motor 16 can be simplified and cost advantageous.

[0027]

Effects of the Invention As is clear from the above detailed description, according to the present invention, the acceleration operation in which the throttle valve is opened more than the target opening during deceleration set from the idle opening to the opening side, and the target opening during deceleration. After a predetermined waiting time has elapsed from the start of at least one of the deceleration operation in which the throttle valve is closed to the target opening during deceleration from a throttle opening larger than In order to prevent this, a control means is provided to drive and control the valve opening/closing motor for a predetermined drive time. During deceleration operation, the throttle valve is opened more than the target opening during deceleration, so the throttle valve opens less than the target opening during deceleration. The closing operation does not occur more than the opening degree, so the dashpot function can be properly performed, and deterioration of emissions and engine stalling can be prevented.

Furthermore, since there is no need to incorporate a throttle positioner sensor into the valve opening/closing motor, the configuration of the valve opening/closing motor can be simplified and cost advantageous.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a throttle control device.

FIG. 2 is a flowchart illustrating throttle valve control during deceleration operation.

FIG. 3 is a time chart illustrating drive control of a valve opening/closing motor during deceleration operation.

FIG. 4 is a relationship diagram between cooling water temperature and predetermined driving time.

FIG. 5 is a time chart illustrating drive control of the valve opening/closing motor during accelerated operation.

FIG. 6 is a system configuration diagram of a conventional throttle control device.

FIG. 7 is a diagram showing the relationship between engine speed, engine intake air, and throttle opening.

[Explanation of symbols]

2 Internal combustion engine 4 Throttle valve control device 8 Throttle valve 12 Throttle sensor 16 Valve opening/closing motor 18 Idle switch 20 Control means 22 Cooling water temperature sensor

Claims (1)

[Claims] 1. An internal combustion engine comprising an idle switch that detects whether or not the internal combustion engine is in idle operation and turns it on and off, and a valve opening/closing motor that controls opening and closing of the throttle valve during a specific operation of the internal combustion engine. In a throttle valve control device, an acceleration operation in which the throttle valve is opened more than a target opening during deceleration set from an idle opening to an opening side, and an opening from a throttle opening larger than the target opening during deceleration to the target opening during deceleration. After a predetermined standby time has elapsed from the start of at least one of the deceleration operation in which the throttle valve is closed on the opening side, the valve is opened and closed in order to prevent the throttle valve from operating closer than the target opening during deceleration. 1. A throttle valve control device for an internal combustion engine, comprising a control means for driving and controlling a motor.