JPH05306635A - Throttle valve control device of engine - Google Patents

Abstract

PURPOSE:To ensure drivability in response to system fuel by comparing a plurality of throttle valve opening degrees with each other just before engine condition is transferred from an idling time to an off-idling time, and setting the throttle valve opening degree judged larger at the time of idling time. CONSTITUTION:The whole of a device is provided with a first member 3 which is interlocked to an accelerator 1, a second member 7 following the first member 3 while being interlocked to a throttle valve 10, and a third member 15 driven by a motor 8. In this case, a throttle valve 10 is set to a first opening degree while maintaining a prescribed interval between the first member 3 and the second member 7 at the idling time. On the other hand, at the off-idling time, the throttle valve 10 is set to a second opening degree according to an accelerator opening degree by a sensor 5. Just before the engine condition is transferred from the idling time to the off-idling time, the first opening degree is compared with the second opening degree. As a result, when it is judged that the value of the first opening degree is larger than that of the second opening degree, the first opening degree is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine throttle valve control device, and more particularly to an engine throttle valve control device configured to control a throttle valve opening degree according to an accelerator opening degree through the control device. ..

[0002]

2. Description of the Related Art Conventionally, it has been known to perform a throttle valve opening control according to an accelerator opening (hereinafter referred to as a throttle valve control), which is performed depending on an engine operating condition. Various proposals have been made for implementing such optimum control. By the way, for throttle valve control,
A bypass valve that performs a control function that sets the idle speed, a dashpot that functions to absorb and absorb the sudden movement of the accelerator, an actuator that performs a vehicle speed control function such as auto cruise, and a second throttle that performs traction control. A valve control means or the like is usually required, but a configuration including all of the above components is very large.

Then, for example, Japanese Patent Laid-Open No. 64-41625.
A first proposal has been made to perform throttle valve control according to the accelerator opening degree and to cope with an abnormality occurrence as in Japanese Patent Publication No. JP-A-2003-242977. According to the proposal, a throttle valve opening / closing shaft for opening / closing a throttle valve is provided. While transmitting the rotation amount according to the accelerator opening, the motor output shaft is connected to this opening / closing shaft via an electromagnetic clutch, and the opening / closing control of the throttle valve is based on the rotation control of the motor under the control of the control device. While controlling the opening of the throttle valve, the output of the engine is sharply reduced when an abnormality such as a system failure occurs in the control state of the control device or each control device.

Further, in the throttle valve control, in order to cope with a system failure of the electric control system, it is also necessary to have a structure in which the accelerator pedal and the throttle valve can be mechanically connected at the time of the failure, so that the accelerator opening degree is conventionally used. Another proposal has been made in which a restricting means is provided so that the throttle is not controlled to be opened. However, in order to perform the idle speed control function based on the rotation control of the motor under the control of the control device, delicate control of the motor is required in the range close to the idle speed. In the proposal, since the throttle valve control is performed via the electromagnetic clutch, there is a problem that it is difficult or impossible to implement. Further, according to the second proposal, since the control in the opening direction cannot be performed, there is a problem that, for example, only the control in the closing direction can be performed during the traction control, and the function is halved.

Therefore, the first urging force that urges the accelerator in the returning direction is obtained in conjunction with the accelerator, and
A first member having a restricting portion, and a second member that is arranged to interlock with the throttle valve and follow the restricting portion.
Driven by a member and a motor connected to the control device,
In addition, a third member that restricts the second member from the opening direction side of the throttle valve and a second biasing force that causes the second member to follow the third member are provided, and the first member and the second member
The present applicant has proposed a configuration in which the first throttle valve opening is set while maintaining a predetermined interval between members, while the second throttle valve opening is set according to the accelerator opening during off-idling, and the present applicant has proposed the above problem. The points have been resolved.

According to the proposal, the first member is maintained while maintaining a predetermined distance between the first member and the second member during idling.
The throttle valve opening is set so that it is possible to cope with load fluctuations that occur when an air conditioner, a power steering device, etc. are used during idling.

[0007]

However, from the setting state based on the first throttle valve opening during idling described above, the accelerator operation is performed to shift to the off-idling state, and the second throttle valve depending on the accelerator opening. When the air conditioner, the power steering device, etc. are in the operating state when shifting to the state of setting the opening degree, the first throttle valve opening degree during idling is the second throttle valve opening degree during off idling. May be larger than

In this case, when the second throttle valve opening at the time of off-idle is set according to the operation of opening the accelerator, the throttle valve opening is rather reduced contrary to the operation of opening the accelerator. As a result, it was found that drivability deteriorates as if the driver feels a tingling sensation immediately after starting the vehicle. On the other hand, even when the first throttle valve opening during idling is set to a relatively large value for a long period of time, such as during warm-up operation in winter, the off-idle operation is performed depending on the accelerator opening operation. It has been found that when the setting is changed to the setting of the throttle valve opening degree, a reverse rotation phenomenon occurs in which the throttle valve opening degree is rather reduced contrary to the operation of opening the accelerator and the drivability is deteriorated.

Therefore, the engine throttle valve control device of the present invention has been made in view of the above problems, and its purpose is to simplify the configuration of the entire device and prevent system failure. (EN) Provided is a throttle valve control device for an engine, which is capable of coping with the throttle valve opening / closing control in accordance with an idle / idle operation state of the engine so as not to deteriorate drivability.

[0010]

[Means for Solving the Problems] and

In order to solve the above problems and achieve the object, the present invention has the following constitutions. That is, a first urging force that interlocks with the accelerator and urges the accelerator in the returning direction, and has a first member having a restricting portion, and a second member that interlocks with the throttle valve and follows the restricting portion, An engine provided with a third member that is driven by a motor connected to the control device and that restricts the second member from the opening direction side of the throttle valve, and a second biasing force that causes the second member to follow the third member. A throttle valve control device, which has a first
A first control means for setting the first throttle valve opening while maintaining a predetermined distance between the member and the second member;
Second control means for setting a second throttle valve opening degree according to the accelerator opening degree, and comparison means for comparing the first throttle valve opening degree and the second throttle valve opening degree immediately before shifting from idling to off-idling And the second,
When it is determined that the first throttle valve opening is larger than the throttle valve opening, the setting state is set by the first control means so that the engine speed decreases when shifting from the idle state to the off idle state. To prevent the deterioration of drivability.

Preferably, the first control means is used until the second throttle valve opening degree becomes larger than the first throttle valve opening degree before the shift to the off-idle state when shifting from the idle state to the off-idle state. By holding the set state, the engine speed is prevented from decreasing when the engine shifts from the idle state to the off-idle state, and the drivability is prevented from decreasing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, FIG. 1 is a model diagram of a throttle valve control device for an engine, all of which are shown in a plan view, and all the parts such as the up-down direction described below are based on this figure, and the actual direction is They do not necessarily match. Note that FIG. 1 is proposed by the applicant of the present application.

In the figure, the accelerator pedal 1 is provided so that an operating force can be transmitted to the first member 3 via a link mechanism or the like, and the first member 3 is provided so as to be movable in the vertical direction in the figure. .. Further, an accelerator idle switch 2 is provided in the middle of the link mechanism connected to the accelerator pedal 1 described above, and the idle state in which the accelerator is not operated can be detected by detecting the switch. A return spring 4 is stretched between the first member 3 and the vehicle body. The first member 3 constantly urges the first member in a direction in which the throttle valve 10 is closed and an electric output signal corresponding to the opening degree of the accelerator pedal 1. In order to obtain the above, the detection unit of the accelerator opening sensor 5 provided on the vehicle body side is provided.
The first member 3 is further provided with a fast idle thermostat 6 so as to achieve idle up in cold weather.

Next, the second member 7 interlocks with the throttle valve 10 to open and close the throttle valve 10. The second member 7 moves upward in the drawing to open the throttle valve 10, while moving downward. And the closing portion 3 of the first member 3
The control in the idle state is performed in a state where the space E is maintained between a and the regulation portion 7a of the second member 7 as illustrated. The second member 7 is regulated when it moves in the closing direction by an adjustable closing limiter 13, while the rod spring 14 stretched between the third member 15 and the second member 7 The member 15 and the member 15 are brought into contact with each other as shown. Further, the opening of the throttle valve 10 can be detected by a throttle opening sensor 11, and the throttle switch 12
Enables motion detection.

On the other hand, the third member 15 is connected to a motor 8 which is connected to a control device which will be described later, and by driving the third member 15 in the vertical direction as shown in the figure, the third member 15 is driven. The opening / closing control of the throttle valve 10 is performed by vertically moving the second member 7 that is in the contact state. Further, a motor spring 9 is further stretched between the vehicle bodies on the third member 15 and urges the third member 15 so as to always move upward, so that the motor 8 is driven when the system fails. When the stop is forcedly stopped, the restricting portion 7a of the second member 7 which is in contact with the third member 15 becomes the restricting portion 3 of the first member 3.
The throttle valve 10 and the accelerator pedal 1 are mechanically connected to each other by a direct contact with a so as to prevent a situation in which the vehicle cannot be moved. This is called a limp mode. After this, the system failure can be repaired by allowing operation to a repair shop.

FIG. 2 is a block diagram of FIG. 1 and shows the system of the limp mode at the time of system failure. In this figure, when the system fails, the motor 8
When the driving of the second member is forcibly stopped, the third member 15 and the second member 15
As a result of "= mechanical drive system =" being formed between the accelerator pedal 1 and the throttle valve 10 in a relationship where the member 7 and the first member 3 are in direct contact with each other as described above, the limp mode can be supported. ..

Further, during normal operation, it can be controlled by "= electronic control system =" formed between the accelerator pedal 1 and the throttle valve 10. For this purpose, the electronic control system connects the ECU 101 with the accelerator opening sensor 5, the throttle opening sensor 11, the accelerator idle switch 2, and the throttle fast switch 12, as well as the EGI controller 102 and the backup circuit 105. The throttle valve 1 via the third member 15.
The motor drive circuit 108 for opening and closing 0 is backed up. While the throttle valve opening control according to the accelerator opening at the time of normal operation is performed by the electronic control system having the above configuration, when an abnormality occurs in each sensor, switch, motor, CPU, etc., the backup circuit 105 acts. The motor drive is stopped so that the limp mode can be entered.

Next, FIG. 3 shows an example of a circuit configuration of the motor drive circuit 108 connected to the ECU. The above-mentioned throttle valve is finely driven in a range of 0 to 5 degrees for shifting from the idle state to the off idle state. On the other hand, the circuit configuration is for driving the motor in a large range up to a range of 90 degrees until the throttle valve is fully opened. In this figure, the ECU 101 described in FIG. 2 turns on / off the idle control output via the signal line 106 to the gate element 11
6 and 117, a 10-bit digital signal for driving the motor 8 in a predetermined manner can be transmitted to the digital-analog converter (D / A) 107 via the signal line 120. This D / A107
Is connected to two types of dividing resistors via an operational amplifier 111.

For this reason, for example, the resistance value of 2 is 10 KΩ.
The first resistors 112 and 113 are connected in series and grounded, while the second resistor 114 having a resistance value of 8 KΩ and the third resistor 115 having a resistance value of 2 KΩ are connected in series and grounded. .. The first analog switch 118 and the second analog switch 11 are connected from the middle tap of the resistor connected in this way.
The signal line connected to 9 is wired. on the other hand,
The first analog switch 118 is wired between the elements 116 and 117 described above, and the second analog switch 119 is wired to the element 117, and the output of each analog switch is connected to the signal line 110. It is configured to obtain a motor drive output which is an opening / closing control signal of the throttle valve 10.

In the above configuration, after the digital data which is the opening / closing control signal of the throttle valve 10 from the ECU 101 is converted into the analog value via the D / A 107,
It is amplified by the operational amplifier 111 and enters into two types of dividing resistors, and two types of output voltage, large and small, are obtained. This output voltage is input to each of the analog switches 118 and 119. When the idle control output sent through the signal line 106 is off, the first analog switch 118 is turned on and is output as an off idle signal, and the throttle As the opening / closing control of the valve 10, the motor is driven in a large range up to a range of 90 degrees until the throttle valve is fully opened.

When the idle control output is on, the second analog switch 119 is turned on and outputs as an idle signal to shift the throttle valve 10 from idle to off idle, for example, in a range of 0 to 5 degrees. To drive. That is, when the digital data which is the opening / closing control signal of the throttle valve 10 is set to 10 bits, 1
There is a resolution of 024, but the second analog switch 119
When is on, the throttle valve 10 has a resolution of 1024.
It becomes possible to drive finely in the range of 0 to 5 degrees, which shifts from the idle state to the off idle state.

On the other hand, when the first analog switch 118 is turned on, the throttle valve 10 has a resolution of 1024.
The opening / closing control can be performed within a range of 90 degrees until the throttle valve is fully opened. As a result, during normal driving,
The throttle valve 10 can be controlled in basic units divided into 1024 in the range of 90 degrees from full closing to maximum opening, while 0 to 5 shifting from idling to off idling.
It becomes possible to perform control in a finer basic unit in which the range of about 10 degrees is divided into 1024, and it is also possible to perform engine idle control to a rotational speed within an error range of about 20 RPM, for example.

Next, FIG. 4 is a control flow chart in an idle state of the engine, showing an example of control.
In the figure, after the engine is started, the engine is shifted to the idle mode, and in step S1, abnormality detection of each sensor, switch, motor and other electronic control system is executed, and step S1 is executed.
If the fail determination is made in step 2 and there is an erroneous operation or erroneous detection, the process goes to the fail mode in step S3 and the transition process is stopped. On the other hand, if there is no fail determination, the process proceeds to the next step S5 and the accelerator pedal 1
Is operated to determine whether the throttle switch 12 is turned on. If it is turned on, the process proceeds to step S6, and whether the external throttle control input input to the ECU 101 is larger than the previous throttle control output (>) If it is determined that the external throttle control input is smaller than the previous throttle control output, the process proceeds to step S8.

In step S7, the previous throttle control output before the throttle switch is turned on is set to the throttle control output, and then the process proceeds to step S13. The throttle control output is stored as the throttle opening and then to step S14. The latched state of the digital data to the advance D / A 107 is released, and the digital data based on the throttle opening stored in step S13 is latched,
Return (step S15).

On the other hand, if it is determined in step S5 that the throttle switch is not turned on, the process proceeds to step S8, in which the external throttle control input for making the optimum idle state is input to the ECU 101 to set the control throttle opening. It After this, in step S9, the actual accelerator opening and the control throttle actual opening are calculated, and then in step S10, the actual accelerator opening and the control throttle actual opening are compared and the actual accelerator opening is performed. Degree> control throttle actual opening degree, the process proceeds to step S12. In step S12, the external throttle control input is set to the throttle control output, and the process proceeds to step S13 to execute the above-mentioned storage.

Further, in step S10, if accelerator actual opening <control throttle actual opening, then step S10.
After proceeding to step 11 to eliminate the effect of the actual accelerator opening on the throttle opening by multiplying the value of the actual accelerator opening by 90%, the throttle control output based on this result is set, and the procedure proceeds to step S13 and the transition step. Execute S. The above-described steps S and S are repeatedly executed to prevent the occurrence of a reverse rotation phenomenon in which the throttle valve opening is rather reduced contrary to the operation of opening the accelerator to prevent the drivability from being deteriorated. ..

Next, when the control flow in the off idle mode is performed based on the control flow chart of FIG. 5, the mode is shifted to the run mode after the engine is started, and in step S21, the sensors, switches, motors and other electronic components are switched. When abnormality detection of the control system is performed and fail determination is performed in step S22, and there is a malfunction or erroneous detection, transition to the fail mode in step S23 and the transition processing is stopped. On the other hand, if there is no fail determination, the process proceeds to the next step S24, and it is determined whether or not the accelerator pedal 1 is operated, the throttle switch 12 is turned on, and the off-idle running state is first (first time). If the determination is made and it is the first time, the routine proceeds to step S25, where the ECU 101 sets the throttle opening to the throttle lower limit value and then proceeds to step S26. If it is determined in step S24 that the throttle switch 12 has not been turned on for the first time, step S24
In step 26, the external throttle control input is set to the control throttle opening.

Next, in step S27, whether the set control throttle opening is larger than the throttle lower limit value (>
Whether or not) is determined, and if it is larger, step S
On the other hand, if it is smaller, the process proceeds to step S34. In step S34, the throttle lower limit value is set to the throttle control output, and then the process proceeds to step S33. In step S33, the throttle control output is stored as the throttle opening degree, and then the process proceeds to step S35.
The latched state of the digital data to 107 is released, the digital data based on the throttle opening stored in step S33 is latched, and the process returns (step S36).

On the other hand, if it is determined in step S27 that the control throttle opening is larger than the throttle lower limit value, the process proceeds to step S28, and after the calculation of the actual accelerator opening and the actual control throttle opening is executed, step S30 Then, the actual accelerator opening and the actual control throttle opening are compared, and if the actual accelerator opening> the actual control throttle opening, the routine proceeds to step S32. In step S32, the external throttle control input is set to the throttle control output, and the process proceeds to step S33, and the above-mentioned storage is executed.

If it is determined in step S30 that the actual accelerator opening is less than the control throttle actual opening, step S30 is performed.
After proceeding to 31, the value of the actual accelerator opening is multiplied by 90% to eliminate the influence of the actual accelerator opening on the throttle opening, and then the throttle control output based on this result is set, and the routine proceeds to step S33, where the transition is executed. To do. The above-mentioned steps S and S are repeatedly executed to control the throttle valve opening, contrary to the operation of opening the accelerator.

As a result of the above control, it is possible to prevent the drivability from deteriorating during running at off-idle.

[0032]

As described above, according to the present invention, the structure of the entire apparatus can be simplified, a system failure can be dealt with, and the throttle valve opening / closing control according to the idle / idle operation status of the engine can be appropriately performed. It is possible to provide a throttle valve control device for an engine that does not deteriorate drivability.

[Brief description of drawings]

FIG. 1 is a model diagram of a throttle valve control device for an engine.

FIG. 2 is a block diagram of FIG. 1 and shows a system of a limp mode at a system failure.

FIG. 3 is a circuit configuration example of a motor drive circuit 108 connected to an ECU.

FIG. 4 is a control flow chart in an idle state of the engine.

FIG. 5 is a control flow chart in an off-idle state of the engine.

[Explanation of symbols]

 1 accelerator pedal, 3 1st member, 5 accelerator opening sensor, 7 2nd member, 8 motor, 10 throttle valve, 11 throttle opening sensor, 101 ECU.

Claims (2)

[Claims] 1. A first member having a restricting portion which obtains a first biasing force which is interlocked with an accelerator and biases the accelerator in a returning direction, and a second member which interlocks with a throttle valve and follows the restricting portion. And a third member that is driven by a motor connected to the control device to restrict the second member from the opening direction side of the throttle valve, and a second urging force that causes the second member to follow the third member. A throttle valve control device for an engine, comprising: first control means for setting a first throttle valve opening while maintaining a predetermined distance between the first member and the second member during idling; Second control means for setting a second throttle valve opening degree according to an accelerator opening degree; the first throttle valve opening degree and the second throttle valve immediately before shifting from the idle time to the off-idle time Comparing means for comparing the opening degree with the opening degree, and the comparing means determines that the first throttle valve opening degree is larger than the second throttle valve opening degree.
A throttle valve control device for an engine, wherein the setting is performed by a control means. 2. When transitioning from the idle state to the off-idle state, the first control means is used until the second throttle valve opening becomes larger than the first throttle valve opening before the transition. The throttle valve control device for an engine according to claim 1, wherein the setting is held.