JP2789571B2 - Vehicle control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In the present invention, one of an engine rotation sensor for detecting rotation of an engine and an input shaft rotation sensor for detecting rotation of an input shaft of an automatic transmission is out of order. The present invention relates to a vehicular control device capable of performing self-diagnosis of a failure sensor when a failure is detected.

[Prior Art] As a conventional detector of this type, a detector described in Japanese Patent Application Laid-Open No. 63-1845 is known. The control device described in this publication uses an output shaft rotation sensor that detects rotation of an output shaft of an automatic transmission in addition to an engine rotation sensor and an input shaft rotation sensor. A failure has been detected in the rotation sensor and the input shaft rotation sensor.

That is, in a state where the automatic transmission is shifted to the gear position of the gear ratio Gr, the engine, which is calculated based on the output of each sensor, the rotation speeds of the input shaft and the output shaft are Ne, Ni, and No, respectively. If the sensor has not failed, Ne = Ni = Gr · No. However, if either the engine rotation sensor or the input shaft rotation sensor has failed, Ne ≠ Ni. At this time, if Ne = Gr · No, it is determined that the input shaft rotation sensor has failed, and if Ni = Gr · No, it is determined that the engine rotation sensor has failed.

[Problems to be Solved by the Invention] In the above control device, the speed ratio Gr of the automatic transmission is set.
When the automatic transmission is shifted to the neutral gear position, there is a problem that it is not possible to identify which of the engine rotation sensor and the input shaft rotation sensor has failed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and is capable of detecting a failure in an engine rotation sensor and an input shaft rotation sensor even when an automatic transmission is shifted to a neutral position. The purpose of the present invention is to provide a control device for use.

[Means for Solving the Problems] In order to achieve the above object, the invention described in claim 1 (hereinafter referred to as a first invention) has an engine as shown in FIG. An engine speed sensor 1 for detecting rotation, and an engine speed calculating means 2 for calculating an engine speed Ne ₁ based on the output of the engine speed sensor 1
An input shaft rotation sensor 3 for detecting rotation of an input shaft of an automatic transmission connected to the engine; and an input shaft rotation speed calculation for calculating a rotation speed Ni of the input shaft based on an output of the input shaft rotation sensor 3 Means 4, the engine speed Ne ₁ calculated by the engine speed calculating means 2 and the input shaft speed Ni calculated by the input shaft speed calculating means 4 are compared,
In the case where the two are different, the vehicle control device includes a failure determination unit 5 that determines that one of the engine rotation sensor 1 and the input shaft rotation sensor 3 has failed. Adjusting position detecting means 6 for detecting an adjusting position of the fuel adjusting means for adjusting the amount; and a rotational speed of the engine based on an output of the adjusting position detecting means 6 when a gear position of the automatic transmission is at a neutral position. Neutral time calculating means 7 for calculating Ne ₂ , and when the failure discriminating means 5 determines that a failure has occurred and the gear position of the automatic transmission is in the neutral position, the engine speed calculating means 2 calculates Engine RPM
One of Ne ₁ and the input shaft speed Ni calculated by the input shaft speed calculating means 4 is compared with the engine speed Ne ₂ calculated by the neutral time calculating means 7, and both are substantially equal. It is characterized by comprising a failure point identification means 8 for identifying a failure sensor among the engine rotation sensor 1 and the input shaft rotation sensor 3 depending on whether they are equal or not.

Further, as shown in FIG. 1 (B), the invention according to claim 2 (hereinafter referred to as a second invention) has an engine rotation sensor 1 and an engine rotation speed calculating means 2 as in the first invention. , Input shaft rotation sensor 3 and input shaft rotation speed calculation means 4, adjustment position detection means 6 and neutral time calculation means 7
It has.

Further, according to a second aspect of the present invention, when the gear position of the automatic transmission is a neutral position, the engine speed Ne ₁ calculated by the engine speed calculating means 2 and the input shaft speed calculating means 4 calculate the engine speed Ne _1. Input shaft speed
Ni and the engine speed Ne ₂ calculated by the neutral time calculating means 7 are compared with each other, and a sensor that outputs an output that is the basis of the rotational speed different from the rotational speed calculated by the neutral time calculating means 7 fails. A failure point determination means 9 for determining that a failure has occurred is provided.

[Operation] In the first invention, the engine speed Ne ₁ calculated by the engine speed calculation means 2 and the input shaft speed Ni calculated by the input shaft speed calculation means 4 are input to the failure determination means 5. Is done. Failure determination means 5, when the engine speed Ne ₁ and the input shaft rotational speed Ni are different, determines that any of the sensors has failed.

If the failure determination means 5 determines that a failure has occurred and the gear position of the automatic transmission is a neutral position, the failure location identification means 8
, The engine speed sensor one and one of the input shaft rotational speed Ni and the engine rotational speed Ne _1, compared with the engine speed Ne ₂ calculated by the neutral operation means 7, depending on whether substantially equal both 1 and the input shaft rotation sensor 3 to identify a failure sensor.

That is, when Ne ₁ and Ne ₂ are compared, if Ne ₁ ≒ Ne ₂ (symbol を indicates almost equal), the input shaft rotation sensor 3 is specified as a failure sensor, and If Ne ₁ ≠ Ne ₂ (the symbol ≠ indicates that they are not equal), it is specified that the engine rotation sensor 1 is a failure sensor.

On the other hand, when comparing Ni and Ne ₂ , if Ni ≒ Ne ₂ , it is specified that the engine rotation sensor 1 is a failure sensor, and if Ni 2Ne ₂ , the input shaft rotation sensor 3 is Identify the sensor as a failure sensor.

In the second invention, when the gear position of the automatic transmission is in the neutral position, the failure point determination unit 9 compares the engine speed Ne ₁ and the input shaft rotational speed Ni, the engine rotational speed Ne ₂ respectively .

If Ne ₁ ≠ Ne ₂ , it is determined that the engine rotation sensor 1 has failed, and if Ni ≠ Ne ₂ , the input shaft rotation sensor 3
Is determined to have failed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a block diagram showing a schematic configuration of the vehicle control device according to the first invention. First, a vehicle to be controlled by the control device shown in FIG. 1 will be described. This vehicle includes an engine 11, a clutch 12, and an automatic transmission 13, and the rotation of an output shaft 11a of the engine 11 is automatically transmitted via the clutch 12. The rotation of the output shaft 13b of the automatic transmission 13 is transmitted to the wheels 17 via the axle 14 by being transmitted to the input shaft 13a of the transmission 13.

In addition, a stepping motor (fuel adjusting means) 16 is provided for adjusting the amount of fuel supplied to the engine 11, and the amount of fuel supplied is adjusted according to the rotational position of the stepping motor 16. Here, when the load on the engine 11 is no load, for example, when the clutch 12 is disengaged, or when the gear position of the automatic transmission 13 is at the neutral position, the rotation speed of the engine 11 and the fuel supply amount Has a specific correspondence. Therefore, when there is no load, the rotational speed of the engine is specified by the rotational position of the stepping motor 16. This correspondence is measured in advance.

Further, the clutch 12 is provided with a clutch operation mechanism 17 for performing an on-off operation, and the automatic transmission 13 is provided with a gear position operation mechanism 18 for changing a gear position. .

Next, the control device will be described. The control device includes a microcomputer (hereinafter abbreviated as a microcomputer) 19. The microcomputer 19 receives a clutch signal C indicating the connected / disconnected state of the clutch 12 from the clutch operating mechanism 17 and a gear position signal G indicating the gear position from the gear position operating mechanism 18, and receives signals from various sensors. Each signal is input.

Sensors that output signals to the microcomputer 19 include an engine rotation sensor 20 (hereinafter, referred to as a Ne sensor), an input shaft rotation sensor (hereinafter, referred to as a Ni sensor) 21, and an output shaft rotation sensor (hereinafter, referred to as a No sensor). .) 22 and a rotational position sensor (adjustment position detecting means) including a potentiometer and the like
There are 23. Of course, there are sensors other than these, but they are omitted here. The engine rotation sensor 20 is an engine
The signals S ₁ indicating the rotation of an output shaft 11a of 11, the input shaft rotation sensor 21 signals S ₂ indicating the rotation of the input shaft 13a of the automatic transmission 13
The output shaft rotation sensor 22 is the output shaft 13b of the automatic transmission 13.
The signal S ₃ indicating the rotation of the further rotational position sensor 23 and outputs a signal S ₄ indicating the rotational position of the stepping motor 16, respectively microcomputer 19.

The microcomputer 19 determines the rotation speed Ne of the output shaft 11a based on the output signals S ₁ , S ₂ , S ₃ , and S ₄ of the sensors 20, 21, 22, and 23.
₁ , the rotation speed Ni of the input shaft 13a, the rotation speed No of the output shaft 13b, the load of the engine 11, and the like are calculated, and the rotation position of the stepping motor 16, that is, the fuel supply amount, the on-off state of the clutch 12, the automatic transmission 13 Gear position is determined appropriately.

Further, the microcomputer 19 makes a self-diagnosis of a failure of the engine rotation sensor 19 and the input shaft rotation sensor 21 as follows.
In this case, the self-diagnosis is performed separately when the automatic transmission 13 is shifted to a gear position other than the neutral position and when the automatic transmission 13 is shifted to the neutral position.

When the automatic transmission 13 is shifted to any gear position other than the neutral position, the operation is performed in the same manner as in the above-described related art. That is, the gear ratio of the automatic transmission 13 is Gr
If the sensors 20, 21, and 22 do not fail, then Ne ₁ = Ni = Gr · No. However, if one of the sensors 20 and 21 has failed, Ne ≠ Ni. At this time, by comparing _{one of} the rotation speeds Ne ₁ and Ni with the rotation speed Gr · No, the sensor
Which of 20, 21 has failed is specified. For example, if Ne ₁ = Gr · No, it is specified that the Ne sensor 20 is normal and the Ni sensor 21 has failed.

If Ni = Gr · No, it is specified that the Ni sensor 21 is normal and the Ne sensor 20 has failed.

On the other hand, when the automatic transmission 13 is shifted to the neutral position, the rotation speed Gr · No cannot be used. Therefore, in the control device of the present invention, the rotational position sensor 23
Engine based on the input signal S ₄ when no load from
Calculates the 11 rotation speed Ne ₂ of the sensor by the rotation speed Ne ₂
Which of 20, 21 is out of order is specified.

That is, when Ne ₁ ≠ Ni and the gear position of the automatic transmission 13 is the neutral position, the microcomputer 19 determines the engine speed Ne ₂ based on the output signal S ₄ of the rotation position sensor 23.
Is calculated. The engine speed Ne ₂ and the engine speed N
The failure sensor is specified by comparing the value of the e ₁ or the input shaft speed Ni. For example, if Ne ₂ ≒ Ne ₁ , it is specified that the engine rotation sensor 20 is normal and the input shaft rotation sensor 21 has failed. If Ne ₂ ≒ Ni, it is specified that the input shaft rotation sensor 21 is normal and the engine rotation sensor 20 has failed.

The above-mentioned fault sensor is specified in accordance with the flowchart shown in FIG.

In the flowchart shown in FIG. 3, after the start of the program, it is first determined in step 101 whether or not the clutch 12 is in the engaged state. If the clutch 12 is in the disconnected state, the failure determination of the sensors 20 and 21 is not performed.

On the other hand, if the clutch 12 is in the engaged state, it is determined whether Ne ₁ = Ni (step 102).

If Ne ₁ = Ni, it is determined that there is no failure, and the program ends.

If Ne ₁ ≠ Ni, in step 103 the automatic transmission
It is determined whether the thirteenth gear position is the neutral position.

If it is not the neutral position, the rotational speed Gr · No is calculated (step 104), and then it is determined in step 105 whether Ni = Gr · No.

If Ni = Gr · No, Ne sensor 2 of sensors 20 and 21
0 is identified as having failed (step 106), and the program ends.

If Ni ≠ Gr · No, the Ni sensor 21 is specified as a failure sensor (step 107), and the program ends.

On the other hand, in the determination of step 103, the automatic transmission 13
When the gear position is in the neutral position, the rotation position sensor
It calculates the engine rotational speed Ne ₂ based on the output signal S ₄ of 23 (step 108). Next, in step 109, Ne ₁
And Ne ₂ are substantially equal to each other. In this case, if | Ne ₁ −Ne ₂ | ≦ α, it is determined that Ne ₁ ≒ Ne ₂ . Tolerance α is the engine speed calculated from the output signal S ₄ of the rotational position sensor 23 Ne
Accuracy of the correspondence between ₂ and the actual engine speed, and N
It is a very small amount that is determined in consideration of a difference or the like that should be regarded as a failure between e ₁ and Ne ₂ .

If Ne ₁ ≒ Ne ₂ , the Ni sensor 21 is specified as a failure sensor (step 110), and the program ends.

If Ne ₁ ≠ Ne ₂ , the Ne sensor 20 is specified as a failure sensor (step 111), and the program ends.

As described above, the above-described control device includes the stepping motor
Calculates the engine rotational speed Ne ₂ from 16 rotational position of a comparison between the engine speed Ne ₁ calculated based on the output of the rotation speed Ne ₂ and the engine rotation sensor 20, whereby the engine speed sensor 20 input shaft The automatic transmission is used to identify which of the rotation sensors 21 is out of order.
Even when the 16 gear positions are the neutral positions, the failure sensor can be specified effectively.

Next, the control device according to the second invention will be described. The overall configuration is the same as that shown in FIG. However, in the control device according to the second invention, after the control device according to the first invention determines whether Ne ₁ = Ne ₂ , it determines whether the control device is at the neutral position. On the other hand, it is first determined whether or not the vehicle is in the neutral position. If the vehicle is in the neutral position, Ne ₂ is constantly calculated, and Ne ₂ is compared with Ne ₁ and Ni.

The details will be described with reference to the flowchart shown in FIG. 4. In step 201, it is first determined whether the clutch 12 is in the engaged state. If the clutch 12 is in the disconnected state, the program is terminated without performing the failure diagnosis.

Automatic transmission when clutch 12 is connected
It is determined whether the thirteenth gear position is the neutral position (step 202).

If it is not the neutral position, it is determined in step 203 whether Ne ₁ = Ni.

If Ne ₁ = Ni, the program ends assuming that the sensors 20 and 21 have no failure.

If Ne ₁ ≠ Ni, the failure sensor is determined in the same manner as in the above-described embodiment. That is, after Gr.No is calculated in step 204, Gr.N
It is determined whether or not o and Ni are equal (step 205).
If Ni = Gr · No, it is determined that the Ne sensor 20 has failed (step 206), and if No ≠ Gr · No, it is determined that the Ni sensor 21 has failed. (Step 207).

On the other hand, if the determination in step 202 is affirmative, that is, if the gear position of the automatic transmission 13 is the neutral position, in step 208, the output signal S of the rotational position sensor 23 is output.
₄ , the engine speed Ne ₂ is calculated. Next, in step 209, the engine speed Ne _2, whether the engine speed Ne ₁ based on the output signals S ₁ of the engine rotation sensor 20 are approximately equal or not.

Note that whether or not Ne 判断 Ne ₂ is determined by the first
This is performed in the same manner as in the embodiment according to the invention.

If Ne ₁ ≠ Ne _2, it is determined that the Ne sensor 20 has failed (step 210), and the program ends.

If Ne ₁ ≒ Ne ₂ , in step 211, the rotation speed Ni
There whether substantially equal to the rotation speed Ne ₂ is determined.

If Ni ≠ Ne _2, it is determined that the Ni sensor 21 has failed (step 212), and the program ends. Of course, if Ni ≒ Ne ₂ , it is determined that neither the Ne sensor 20 nor the Ni sensor 21 has failed.

Thus, also in the control device according to the second invention,
Calculates the rotation speed Ne ₂ of the engine 11 from the rotational position of the stepping motor 16, this between the rotation speed Ne ₂ and the rotational speed Ne ₁ and the rotational speed Ni compared, the rotational speed of the underlying different from the rotation speed Ne ₂ Output since the sensor which outputs the signals S ₁ or S ₂ is determined faulty sensors, also the gear position of the automatic transmission 13 is a case where the neutral position, either fails of the sensor 20, 21 Can be determined effectively.

It should be noted that the present invention is not limited to the above-described embodiment, but can be appropriately changed without departing from the scope of the invention.

For example, step 109 of the flowchart shown in FIG.
In, it is determined whether Ne ₁ ≒ Ne ₂ or not.
Whether the Ni ≒ Ne ₂ may be determined. In such a determination, when the determination is affirmative, it is determined that the Ne sensor 20 has failed, and when the determination is negative, it is determined that the Ni sensor 21 has failed.

Further, although the stepping motor 16 is used as the fuel adjusting means, other actuators may of course be used.

In addition, although the rotational position of the stepping motor 16 is detected as the fuel adjustment position, a control rod moved by the stepping motor 16 (adjusts the fuel injection amount of the diesel engine fuel injection pump.)
May be detected.

[Effects of the Invention] As described above, in the vehicular control device of the first invention, the engine speed is calculated from the adjustment position of the fuel adjusting means, and is based on the engine speed and the output of the engine speed sensor. Since the engine speed and the input shaft speed based on the output of the input shaft speed sensor are compared with each other, even when the gear position of the automatic transmission is in the neutral position, the engine speed sensor and the input speed are compared. The effect is obtained that it is possible to specify which of the shaft rotation sensors is the failure sensor.

Also in the vehicle control device of the second invention, the engine speed based on the adjustment position of the fuel adjusting means, the engine speed based on the output of the engine speed sensor, and the input shaft speed based on the output of the input shaft speed sensor As in the case of the control device of the first invention, even if the gear position of the automatic transmission is in the neutral position, either of the engine rotation sensor or the input shaft rotation sensor fails. Can be determined.

[Brief description of the drawings]

FIG. 1A is a block diagram corresponding to the invention described in claim 1, and FIG. 1B is a block diagram corresponding to claim 2.
2 is a block diagram corresponding to the invention described in the section, FIG. 2 is a diagram showing a schematic configuration of an embodiment of the first invention, and FIG. 3 is a flowchart for specifying a fault sensor in the embodiment shown in FIG. FIG. 4 is a view showing a flowchart for determining a failure sensor according to the embodiment of the second invention. DESCRIPTION OF SYMBOLS 1 ... Engine rotation sensor, 2 ... Engine rotation speed calculation means, 3 ... Input shaft rotation sensor, 4 ... Input shaft rotation speed calculation means, 5 ... Failure determination means, 6 ... Adjustment position detection means, 7 ... Neutral operation means, 8.
9: failure location determination means, 11: engine, 13: automatic transmission, 13a: input shaft, 16: stepping motor (fuel adjustment means), 19:
... microcomputer, 20 ... engine rotation sensor,
21 ... input shaft rotation sensor, 23 ... rotation position sensor (adjustment position detection means).

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16H 59:46

Claims (2)

(57) [Claims] 1. An engine speed sensor for detecting engine speed, an engine speed calculation means for calculating the engine speed based on the output of the engine speed sensor, and an input shaft of an automatic transmission connected to the engine. An input shaft rotation sensor that detects the rotation of the input shaft rotation sensor; an input shaft rotation speed calculation unit that calculates the rotation speed of the input shaft based on the output of the input shaft rotation sensor; and an engine rotation speed calculated by the engine rotation speed calculation unit. Failure determination means for comparing the input shaft rotation number calculated by the input shaft rotation number calculation means with each other, and determining that one of the engine rotation sensor and the input shaft rotation sensor has failed if the two are different. An adjustment position detection unit that detects an adjustment position of a fuel adjustment unit that adjusts a fuel supply amount to the engine; and A neutral time calculating means for calculating a rotational speed of the engine based on an output of the adjustment position detecting means when a gear position of the dynamic transmission is at a neutral position; When the gear position of the transmission is the neutral position, one of the engine speed calculated by the engine speed calculating means and the input shaft speed calculated by the input shaft speed calculating means, Comparing the engine speed calculated by the neutral time calculation means with a failure location specifying means for specifying a failure sensor of the engine rotation sensor and the input shaft rotation sensor based on whether or not the two are substantially equal to each other; A control device for a vehicle, comprising: 2. An engine speed sensor for detecting engine speed, an engine speed calculating means for calculating the engine speed based on the output of the engine speed sensor, and an input shaft of an automatic transmission connected to the engine. A control device for a vehicle, comprising: an input shaft rotation sensor for detecting rotation of the motor; and an input shaft rotation speed calculating means for calculating a rotation speed of the input shaft based on an output of the input shaft rotation sensor. Adjusting position detecting means for detecting an adjusting position of the fuel adjusting means for adjusting the supply amount; and, when a gear position of the automatic transmission is a neutral position, the engine speed based on an output of the adjusting position detecting means. Neutral calculating means for calculating, when the gear position of the automatic transmission is a neutral position,
The engine speed calculated by the engine speed calculating means and the input shaft speed calculated by the input shaft speed calculating means are compared with the engine speed calculated by the neutral time calculating means, respectively. A control device for a vehicle, comprising: a failure point determination unit that determines that a sensor that outputs an output serving as a basis of a rotation speed different from the rotation speed calculated by the time calculation unit has failed.