JP2000291483A - Device for specifying defective throttle sensor in electronic throttle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify an abnormal throttle sensor, on the basis of information of revolutions of an internal combustion engine other than a throttle sensor. SOLUTION: A device 10 for specifying a defective throttle sensor in an electronic throttle is provided with a revolution detecting sensor 2 for detecting a number of revolutions NE of an internal combustion engine 1, a throttle sensor 4 for detecting a throttle opening VTA1 of a throttle valve 3, and a control unit 8 for determining the abnormality of the throttle sensor on the basis of the revolution NE of the internal combustion engine 1 and the throttle opening VTA1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for identifying a defective throttle sensor in an electronic throttle.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
If the difference between the signal output from the throttle sensor and the signal output from the second throttle sensor is larger than a predetermined value, the throttle sensor that outputs the output signal having the larger value among the output signals is normal. Is disclosed.

[0003] As a malfunction of the throttle sensor, it is conceivable that the sliding resistance constituting the throttle sensor is disconnected. Generally, when the sliding resistance is broken, the resistance value of the sliding resistance increases, and the signal output from the throttle sensor decreases.

[0004]

However, as an abnormality of the throttle sensor, for example, there is an abnormality such that a sliding portion of a sliding resistor is fixed at a portion having a low resistance value.

In view of the above problems, the present invention provides an apparatus for identifying a defective throttle sensor in an electronic throttle based on information other than the throttle sensor, such as the number of revolutions of an internal combustion engine, for identifying an abnormal throttle sensor. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION An apparatus for identifying a defective throttle sensor in an electronic throttle according to the present invention detects a rotational speed of an internal combustion engine and a throttle opening of the throttle valve. A throttle sensor, and a control unit for determining an abnormality of the throttle sensor based on the rotation speed of the internal combustion engine and the throttle opening are provided, whereby the object is achieved.

An apparatus for identifying a defective throttle sensor in the electronic throttle includes an intake air amount sensor for detecting an amount of air taken in by the internal combustion engine, and the control unit controls the number of revolutions of the internal combustion engine and the air amount. And an abnormality of the throttle sensor may be determined based on the throttle opening.

The operation will be described below.

In the device for identifying a defective throttle sensor in an electronic throttle according to the present invention, abnormality of the throttle sensor is determined based on the rotation speed of the internal combustion engine and the throttle opening. For example, the time variation of the rotational speed of the internal combustion engine is often proportional to the time variation of the throttle opening. Therefore, if the difference between the time variation of the rotational speed of the internal combustion engine and the time variation of the throttle opening is within a predetermined value, it is determined that the throttle sensor that has detected the throttle opening is normal.

In the device for identifying a defective throttle sensor in an electronic throttle according to the present invention, the abnormality of the throttle sensor may be determined based on the rotational speed of the internal combustion engine, the air amount, and the throttle opening. For example, the intake air amount is estimated from the rotation speed of the internal combustion engine and the throttle opening, and if the difference between the estimated air amount and the actually detected air amount is within a predetermined value, the throttle opening is detected. It is determined that the throttle sensor is normal.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

Hereinafter, an apparatus for specifying a defective throttle sensor according to the embodiment will be described with reference to FIG.

FIG. 1 is a diagram showing an apparatus 10 for specifying a defective throttle sensor according to the embodiment.

An apparatus 10 for identifying a defective throttle sensor shown in FIG. 1 includes a rotational speed detecting sensor 2 for detecting the rotational speed of the internal combustion engine 1 and a first for detecting a first throttle opening VTA1 of the throttle valve 3. A throttle sensor 4;
A second throttle sensor 5 for detecting a second throttle opening degree VTA2 of the throttle valve 3, a drive unit 6 for driving the throttle valve 3, an intake air amount sensor 7 for detecting an amount of air taken by the internal combustion engine 1, and a drive And a control unit 8 for controlling the unit 6. Note that the control unit 8 may be a CPU or the like.

Apparatus 10 for identifying defective throttle sensor
Can determine whether or not the throttle sensor is abnormal based on the number of revolutions of the internal combustion engine or the like.

The operation of the apparatus 10 for identifying a defective throttle sensor will be described below with reference to FIG.

FIG. 2 is a diagram showing an example of the operation of the device 10 for identifying a defective throttle sensor.

In step S10, the control unit 8 controls the first throttle opening VTA1 detected by the first throttle sensor 4, the second throttle opening VTA2 detected by the second throttle sensor 5, and the intake air amount sensor 7. The detected intake air amount GN and the rotation speed NE of the internal combustion engine 1 detected by the rotation speed detection sensor 2 are received. For example, the first throttle opening VTA1, the second throttle opening VTA1,
The throttle opening VTA2, the intake air amount GN, and the rotational speed NE may be sequentially stored in a ring memory of the control unit 8.

In step S20, the control unit 8 determines whether or not the condition "| first throttle opening degree VTA1-second throttle opening degree VTA2 | ≤K" is satisfied. When the above condition is satisfied, the control unit 8 regards the first throttle sensor 4 and the second throttle sensor 5 as normal, and ends the process of specifying the defective throttle sensor.

If the above condition is not satisfied, the control unit 8
Deems that at least one of the first throttle sensor 4 and the second throttle sensor 5 is abnormal, and the process proceeds to step S30. Here, K is a predetermined value.

In step S30, the control unit 8 estimates an estimated intake air amount VE1 from the rotational speed NE and the first throttle opening VTA1. For example, the control unit 8 may have a table for instructing an estimated intake air amount corresponding to the relationship between the rotation speed and the throttle opening degree. Control unit 8
After estimating the estimated intake air amount VE1, it is determined whether the condition “| estimated intake air amount VE1−intake air amount GN | <G” is satisfied. Here, G is a predetermined value.

If the condition “| estimated intake air amount VE1−intake air amount GN | <G” is satisfied, the process proceeds to step S
Proceeding to 40, the throttle valve is controlled using the first throttle sensor 4. In this case, the control unit 8 determines that the second throttle sensor 5 is defective.

If the condition “| estimated intake air amount VE1−intake air amount GN | <G” is not satisfied, the process proceeds to step S50. In step S50, the control unit 8 estimates the estimated intake air amount VE2 from the rotational speed NE and the second throttle opening VTA2. The control unit 8 sets the estimated intake air amount VE
After estimating 2, it is determined whether or not the condition “| estimated intake air amount VE2−intake air amount GN | <G” is satisfied.
The method for estimating the estimated intake air amount VE2 is as follows:
It may be the same as that used in 20.

If the condition “| estimated intake air amount VE2−intake air amount GN | <G” is satisfied, the process proceeds to step S
Proceeding to 60, the throttle valve is controlled using the second throttle sensor 5. In this case, the control unit 8 determines that the first throttle sensor 4 is defective.

If the condition “| estimated intake air amount VE2−intake air amount GN | <G” is not satisfied, the process proceeds to step S70, and fail-safe control is performed.

As described above, in steps S30 and S50, a defective throttle sensor can be specified. Step S40 and step S6
As indicated by 0, control of the throttle valve is continued using the throttle sensor determined to be normal.

In this embodiment, steps S30 to S30 are performed.
Instead of step S70, step S11 shown in FIG.
0 to step S190 may be executed.

FIG. 3 is a diagram showing another example of the operation of the device 10 for specifying a defective throttle sensor.

In step S110, the control unit 8 determines whether or not the vehicle equipped with the device 10 for specifying a defective throttle sensor is traveling on a slope. For example, the device 10 for identifying a defective throttle sensor may include an inclination sensor that detects the inclination of the vehicle. If the vehicle is traveling on a slope, the process proceeds to step S120, where fail-safe control is performed. That is, it is not determined whether the throttle sensor is abnormal. The disturbance “slope” is added, and the correlation between the time change amount of the rotational speed NE and the time change amount of the throttle opening may be reduced. For this reason, there is a possibility that the reliability of the determination result as to whether or not the throttle sensor is abnormal is reduced. If the vehicle is not traveling on a slope, the process proceeds to step S130.

In step S130, control unit 8 determines whether or not the transmission provided in the vehicle has shifted up. For example, the device 10 for specifying a defective throttle sensor may have a detection unit for detecting an upshift. If the transmission has shifted up, the process proceeds to step S140, and fail-safe control is performed.
That is, it is not determined whether the throttle sensor is abnormal. A disturbance called “shift up” is applied, and there is a possibility that the correlation between the time change amount of the rotational speed NE and the time change amount of the throttle opening may be reduced. For this reason, there is a possibility that the reliability of the determination result as to whether or not the throttle sensor is abnormal is reduced. If the transmission has not been shifted up, the process proceeds to step S150.

In step S150, the control unit 8 determines that the condition “| A (ΔNE / Δt) − (ΔVTA1 / Δt) | ≦
B ”is satisfied. Where A is
This is a predetermined value. B is a predetermined value. Condition "|
If A (ΔNE / Δt) − (ΔVTA1 / Δt) | ≦ B ”is satisfied, the process proceeds to step S160, and the throttle valve is controlled using the first throttle sensor 4. In this case, the control unit 8 determines that the second throttle sensor 5 is defective.

The condition "| A (ΔNE / Δt)-(ΔVTA
1 / Δt) | ≦ B ”, the process proceeds to step S170.

In step S170, the control unit 8 sets the condition "| A (ΔNE / Δt)-(ΔVTA2 / Δt) | ≤
B ”is satisfied. The condition “| A (Δ
NE / Δt) − (ΔVTA2 / Δt) | ≦ B ”, the process proceeds to step S180, and the throttle valve is controlled using the second throttle sensor 5. In this case, the control unit 8 determines that the first throttle sensor 4 is defective.

The condition "| A (ΔNE / Δt)-(ΔVTA
2 / Δt) | ≦ B ”, the process proceeds to step S190, and fail-safe control is performed.

As described above, in steps S150 and S170, a defective throttle sensor can be specified. Further, as shown in steps S160 and S180, the control of the throttle valve is continued using the throttle sensor determined to be normal.

Before step S10 shown in FIG.
First throttle sensor 4 and second throttle sensor 5
However, it may be determined whether there is an open and a short. For example, the condition “K1 ≦ first throttle opening V
When TA1 ≦ K2 ”is satisfied, the control unit 8
It is determined that the throttle sensor 4 is not open or short-circuited. Here, K1 is a predetermined value. K2 is a predetermined value. Similarly, the condition “K1 ≦ second
When the throttle opening degree VTA2 ≦ K2 ”is satisfied,
The control unit 8 determines that the second throttle sensor 5 is not open or short-circuited. If it is determined that the throttle sensor is open and short,
The controller 8 determines that the throttle sensor is defective.

Although the case where the throttle sensor is a dual system has been described above, the throttle sensor need not be a dual system in order to determine whether or not the throttle sensor is defective. For example, as shown in FIG.
0, step S50, and step S60 may not be performed. That is, the estimated intake air amount is obtained from the rotation speed of the internal combustion engine and the throttle opening, and the estimated intake air amount is compared with the intake air amount to determine whether the throttle sensor is defective. In step S10, it is sufficient that only necessary information is detected in later steps.

Steps S110 and S130 shown in FIG. 3 may not be performed. That is, it is possible to determine whether or not the throttle sensor is defective by comparing the time variation of the rotation speed of the internal combustion engine with the time variation of the throttle opening. In step S10 shown in FIG. 2, only necessary information needs to be detected in a later step.

[0039]

According to the present invention, an apparatus for specifying a defective throttle sensor in an electronic throttle is characterized in that the throttle sensor is abnormal based on a throttle opening detected by the throttle sensor and an amount that changes according to the actual throttle opening. Is determined. The amount that changes according to the actual throttle opening includes the number of revolutions of the internal combustion engine and the amount of intake air.

Since the abnormality of the throttle sensor is determined based on the amount that changes according to the actual throttle opening of the throttle valve, the determination accuracy is high.

[Brief description of the drawings]

FIG. 1 is a diagram showing a device 10 for specifying a defective throttle sensor according to an embodiment.

FIG. 2 is a diagram showing an example of an operation of the device 10 for specifying a defective throttle sensor.

FIG. 3 is a diagram showing another example of the operation of the device 10 for specifying a defective throttle sensor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 internal combustion engine 2 rotation speed detection sensor 3 throttle valve 4 first throttle sensor 5 second throttle sensor 6 drive unit 7 intake air flow sensor 8 control unit 10 device for identifying defective throttle sensor

Continued on the front page F-term (reference)

Claims (2)

[Claims] A rotation speed detection sensor for detecting a rotation speed of the internal combustion engine; a throttle sensor for detecting the throttle opening of the throttle valve; and a rotation speed sensor and a throttle opening based on the rotation speed of the internal combustion engine. An apparatus for identifying a defective throttle sensor in an electronic throttle, comprising: a control unit that determines an abnormality of a throttle sensor. 2. An apparatus for identifying a defective throttle sensor in the electronic throttle, comprising an intake air amount sensor for detecting an amount of air taken by the internal combustion engine, wherein the control unit is configured to: 2. The device according to claim 1, wherein an abnormality of the throttle sensor is determined based on an air amount and the throttle opening. 3.