JPH10331966A - Control device for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the failure of an automatic transmission recognizable on the control device side. SOLUTION: A control device for an automatic transmission has a selected position detecting means 11 for detecting a selected position as a selected position selected by the intention of a driver, a shift pattern control means 12 for controlling a shift pattern of the automatic transmission according to the selected position detected by the selected position detecting means 11, 21 present position detecting means 13 for detecting a present selected position, a position coincidence judging means 14 for judging whether or not the selected position based on the driver's intention detected by the selected position detecting means coincides with the selected position detected by the present position detecting means 13, and a failure judging means 15 for judging the automatic transmission to be out of order when the position coincidence judging means 14 judges discordance of both selected positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, according to such an automatic transmission control device, when a lever operation of a select lever arranged in a driver's seat, for example, a lever operation from an N range to a D range,
Assuming that the select position in the automatic transmission has been selected to the D range as the driver's intention, this is detected,
Even if the driver does not perform the clutching engagement operation, the selection position is changed to the drive, and the engagement element of the automatic transmission is automatically operated so that the vehicle travels in the forward direction.

When the lever is operated from the N range to the R range, the select position in the automatic transmission is detected as being selected by the driver to be in the R range, and the selected position is detected. To automatically operate the fastening element of the automatic transmission so that the vehicle travels in the reverse direction. When the lever is operated from the D range or the R range to the N range, the select position of the automatic transmission is selected to the N range according to the driver's intention, and this is detected, and the selected position is changed to the N range. Manipulate the fastening element to achieve it.

[0004]

However, according to the above-described conventional automatic transmission control device, even if the driver operates the lever from the R range or the D range to the N range, for example, the automatic transmission is controlled. The fastening element in the automatic transmission remains open even though the fastening operation of the fastening element in the machine is not performed against the driver's intention or the lever is operated from the N range to the D range or the R range. There is a problem that these cannot be recognized as a driver.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent a fastening operation of a fastening element in an automatic transmission from being performed against a driver's intention or to prevent the automatic transmission from being operated. It is an object of the present invention to provide a control device for an automatic transmission capable of recognizing, as a driver, a case where the fastening element is left released.

[0006]

In order to achieve the above object, a control apparatus for an automatic transmission according to the first aspect of the present invention comprises:
Select position detecting means for detecting the select position as a select position selected by the driver's intention; shift pattern control means for controlling a shift pattern by the automatic transmission according to the select position detected by the select position detecting means; A current position detecting means for detecting a current select position by the automatic transmission; a select position as the driver's intention detected by the select position detecting means; and the select detected by the current position detecting means. Position match determining means for determining whether or not the positions match, and failure determining means for determining that the automatic transmission has failed when the two select positions do not match by the position match determining means. Have.

With this configuration, the selected position selected by the driver, which is detected by the selected position detecting means, matches the current selected position of the automatic transmission detected by the current position detecting means. It is determined by the position match determination means whether or not the automatic transmission is in the selected position. If the selected position does not match, it can be determined that the automatic transmission is out of order, and the automatic transmission is determined on the control device side. Can be reliably recognized.

In order to achieve the above object, a control apparatus for an automatic transmission according to a second aspect of the present invention is the control apparatus for an automatic transmission according to the first aspect, wherein the current position detecting means comprises: An acceleration change state from an acceleration sensor provided in the automatic transmission is detected as a shock due to engagement / release of a fastening element inside the automatic transmission, and a current select position is detected based on the detection result.

With this configuration, the current position detecting means detects a change in acceleration from an acceleration sensor provided in the automatic transmission as a shock caused by engagement / release of a fastening element inside the automatic transmission, and based on the detection result. As a result, the present select position is detected, and the same operation as the above-described operation of the first aspect can be achieved.

According to a third aspect of the present invention, there is provided a control apparatus for an automatic transmission according to the first or second aspect of the present invention. When the means determines that the automatic transmission has failed, a warning means for warning the failure of the automatic transmission is provided.

With this configuration, not only can the same function as the first aspect of the invention be achieved, but also the warning means can be provided, for example, on a display panel or a display lamp which is disposed in the driver's seat and displays a warning of the failure, This corresponds to an alarm buzzer or the like that notifies a failure by an alarm sound, and the driver can also recognize the failure of the automatic transmission.

According to a fourth aspect of the present invention, there is provided an automatic transmission control apparatus according to the first or second or third aspect. The current position detecting means is directly attached to the automatic transmission or built in a control device, and the control device is directly attached to the automatic transmission.

With this configuration, it is possible to not only achieve the same operation as that of the first aspect of the present invention, but also to easily detect a shock due to engagement / disengagement of a fastening element inside the automatic transmission, and to realize an automatic transmission. The accuracy of the failure determination can be improved. Further, by directly attaching the control device provided with the acceleration sensor to the automatic transmission, a harness between the acceleration sensor and the control device becomes unnecessary, and the product cost can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for an automatic transmission according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram corresponding to claims in a control device for an automatic transmission according to the present invention, and FIG. 2 is an explanatory diagram showing a schematic configuration of a control device for the automatic transmission.

Referring to FIG. 1, a control device 10 for an automatic transmission
Is a select position detecting means 11 for detecting a select position as a select position selected by the driver's intention;
1, a shift pattern control means 12 for controlling a shift pattern by the automatic transmission according to the select position detected by step 1, a current position detecting means 13 for detecting a current select position by the automatic transmission, and a select position detecting means 11. Position match determination means 14 for determining whether or not the select position as the driver's intention detected by the driver and the select position detected by the current position detection means 13 match; When the two select positions are not matched by the determination means 14, a failure determination means 15 for determining that the automatic transmission has failed, and a failure determination means 15 for determining that the automatic transmission has failed,
When the warning means 16 for warning the failure of the automatic transmission and the failure determination means 15 determine that the automatic transmission has failed, the current select position of the automatic transmission is changed to the select position opposite to the current select position. And a control means 17 for controlling the shift pattern control means 12 so as to change to

In FIG. 2, a control device 23 of the automatic transmission 22 mounted on the engine 21 is provided with a select position signal for detecting a select position signal for changing the select position in response to a lever operation of a select lever disposed in the driver's seat. A select position signal detecting unit 24 serving as the detecting unit 11 and a shift control for changing a select position of the automatic transmission 22 in accordance with the select position signal, that is, controlling a fastening operation or a release operation of a fastening element inside the automatic transmission. A mechanical control unit 25, which is a shift pattern control unit 12 that outputs a command signal, and an acceleration change state from an acceleration sensor 26 attached to the automatic transmission 22 is used as a shock due to the engagement / release of a fastening element inside the automatic transmission. Detected, and based on this detection result, the current select position The current position detector 27, which is a current position detector 13 for detecting the current position, controls the entire control device 23, and selects the position related to the lever operation detected by the select position signal detector 24, and the current position. It is determined whether or not the current select position matches the current select position detected by the detection unit 27. Based on the determination result, the automatic transmission 22
And a control unit 28 for determining whether or not is normal. Note that the position match determination unit 14, the failure determination unit 15, and the control unit 17 shown in FIG. 1 correspond to the control unit 28 shown in FIG.

In the driver's seat, a warning lamp (not shown) for notifying the driver of a failure of the automatic transmission 22 is provided. The warning lamp is controlled to be turned on by the control unit 28.

The select position signal detecting section 24
Is to detect a select position intended by the driver according to a select position signal by a driver's lever operation.

The current position detecting section 27 detects a G change (acceleration change) to be described later from the detection value from the acceleration sensor 26, and based on the G change, selects the current select position (neutral) of the automatic transmission 22. ,
Drive or reverse).

As a method of detecting the G change by the current position detector 27, the current detection value (G READ) is subtracted from the previous maximum detection value (G MAX) by the acceleration sensor 26 as shown in FIG. When the calculated value exceeds the positive detection threshold value (G PLUS), the positive G
It can be recognized that a change has been detected.

As shown in FIG. 3B, the current position detection unit 27 calculates the current detection value (G MIN) from the previous minimum detection value (G MIN) of the acceleration sensor 26.
READ), and the calculated value becomes the negative detection threshold (G
MINS), it can be recognized that a negative G change has been detected.

FIG. 4 is an explanatory diagram simply showing a G change detecting operation by the current position detecting section 27 when the automatic transmission 22 performs a normal clutching operation.

The current position detection section 27 is provided when the select lever is operated from neutral (N range) to drive (D range) or when the lever is operated from reverse (R range) to neutral (N range). When a normal clutching operation is performed in the automatic transmission 22, a positive G change as shown in FIG. 4A can be detected.

The current position detecting section 27 performs a normal clutching operation in the automatic transmission 22 when the select lever is operated from neutral to reverse or when the drive is operated from neutral to lever. In this case, a negative G change as shown in FIG. 4B can be detected.

FIG. 5 is a graph showing G by the current position detector 27 when the automatic transmission 22 performs an abnormal clutching operation.
It is explanatory drawing which shows a change detection operation simply.

If the automatic transmission 22 does not perform a normal clutching operation in spite of the fact that the select lever has been operated from neutral to drive or reverse, the current position detector 27 will be described with reference to FIG. No G change is detected as shown in a).

If the automatic transmission 22 does not perform a normal clutching operation in spite of the fact that the select lever is operated from the neutral position to the drive position, the current position detecting section 27 will be described with reference to FIG. A negative G change as shown in FIG. Also, the current position detection unit 27
Detects a positive G change as shown in FIG. 5 (c) if the automatic transmission 22 does not perform a normal clutching operation despite the lever operation from neutral to reverse.

5D. If the automatic transmission 22 does not perform a normal clutching operation in spite of the fact that the lever has been operated from drive or reverse to neutral, the current position detector 27 will be switched to FIG. As shown, no G change is detected.

If the automatic transmission 22 does not perform a normal clutching operation in spite of the fact that the lever is operated from the drive to the neutral position, the current position detecting section 27 will be in the correct position as shown in FIG. Side G change is detected.
Further, if the automatic transmission 22 does not perform a normal clutching operation in spite of the fact that the lever operation has been performed from reverse to neutral, the current position detector 27 will be described with reference to FIG.
A negative G change as shown in (f) is detected.

As described above, the current position detector 27 detects the current select position of the automatic transmission 22 by detecting a change in G as shown in FIGS.

The control unit 28 determines whether or not the selected position by the driver's lever operation matches the current selected position. Based on the result of the determination, whether or not the automatic transmission 22 is normal is determined. Is to recognize. [Table 1] is a failure determination table for determining whether or not the automatic transmission 22 has failed.

[Table 1]

This failure determination table is stored in a memory (not shown) inside the control unit 28 and has five failure determination routes from “0” to “4”.

Further, each failure determination route includes a positive G change flag indicating whether a positive G change has been detected and a negative G change flag indicating whether a negative G change has been detected. And a failure recognition flag indicating whether or not the failure of the automatic transmission 22 has been recognized.

According to this failure determination table, when a positive G change is detected, the positive G change flag is set to "1", and when a negative G change is detected, the negative G change flag is set to "1". "And a failure determination flag (FAIL FLA
G) is set to "1".

The failure determination route "0" indicates an initial state when the engine is started, and the failure determination route is set to "0". In this initial state,
The previous maximum detection value (G MAX), previous minimum detection value (G MIN), and current detection value (GREAD) are cleared, and the failure determination flag is set to “0”.

The failure determination route "1" indicates a state where the select lever is operated from neutral to the drive. When the positive side G change flag is "0", the failure determination flag is set to "1". And when the positive-side G change flag is “1”, the failure determination flag is set to “0”.

The failure determination route "2" indicates a state where the select lever is operated from neutral to reverse. When the negative G change flag is "0", the failure determination flag is set to "1". , And when the negative G change flag is “1”, the failure determination flag is set to “0”.

The failure determination route "3" indicates a state in which the select lever is operated from the drive to the neutral position. When the negative G change flag is "0", the failure determination flag is set to "1". , The failure determination flag is set to “1”, and when the negative change flag is “1”, the failure determination flag is set to “0”.

The failure determination route "4" indicates a state where the select lever is operated from reverse to neutral. When the positive side G change flag is "0", the failure determination flag is set to "1". And when the positive-side G change flag is “1”, the failure determination flag is set to “0”.

Next, the operation of the control device for an automatic transmission according to the embodiment of the present invention in the transmission failure determination processing will be described. 6 and 7 are flowcharts showing the processing operation of the control unit 28 in the transmission failure detection processing.

This transmission failure detection processing is performed when the select position is not actually changed on the automatic transmission side even though the select position is changed by operating the select lever disposed in the driver's seat. This is a process for warning a driver of a failure of the transmission.

In FIG. 6, when the control unit 28 detects the lever operation by the select lever, the select position signal detecting unit 24 reads the select position by the lever operation, that is, the present range (step S1), and the previous range is set. It is determined whether it is neutral (step S2). The previous range corresponds to the select position immediately before the lever operation.

If the previous range is neutral, it is determined whether or not the current range read in step S1 is neutral (step S3). If the current range is not neutral, it is determined whether the current range is reverse (step S4). If the range is reverse this time, it is determined that the lever has been operated from neutral to reverse, the failure determination route is set to “2” (step S5), the select timer is cleared, and the timer is started ( Step S6).
It is assumed that the select timer is inside the control unit 28.

Next, after the timer starts, the current detection value from the acceleration sensor 26 is read by the current position detection unit 27 (step S7), and the maximum detection value read by the current position detection unit 27 as the previous data (step S7). G
MAX) and the minimum detection value (G MIN) are cleared (step S8), and the routine shifts to B shown in FIG.

If the current range is not reverse in step S4, it is determined that the lever has been operated from the neutral to the drive, and the failure determination route is set to "1" (step S9), and the process proceeds to step S6. I do.

If the previous range is not neutral at step S2, it is determined whether the previous range is reverse (step S10). If the previous range is reverse, it is determined whether the current range is neutral (step S11). If the range is neutral this time, it is determined that the lever operation has been performed from reverse to neutral, the failure determination route is set to “4” (step S12), and the process proceeds to step S6.

If the previous range is not reverse at step S10, it is determined that the previous range is drive, and it is determined whether the current range is neutral (step S13). If the range is neutral this time, it is determined that the lever operation has been performed from drive to neutral, and the failure determination route is set to "3" (step S1).
4) The process proceeds to step S6.

If the current range is neutral in step S3, it is determined whether or not the select timer has elapsed for one second or more (step S15). If the select timer has elapsed for one second or more, the select timer is stopped (step S16), and the process proceeds to A shown in FIG.

If the select timer has not elapsed for one second or more in step S15, the current detection value from the acceleration sensor 26 is read by the current position detection unit 27, and the current detection value is compared with the previous maximum detection value. If the current detection value is smaller than the previous minimum detection value, the current detection value is updated as the minimum detection value (step S17). Move to B shown.

If the current range is not neutral in step S11, it is determined that the vehicle is in the drive mode, and the process proceeds to step S15. If the current range is not neutral in step S13, it is determined that the vehicle is driving, and the process proceeds to step S15.

In A shown in FIG. 7, the control device determines whether the failure determination route is set to "0" (step S18). If the failure determination route is not “0”, the failure determination flag (FAIL) is determined based on the failure determination table currently set and the G change currently detected.
-FLAG) (step S19), and it is determined whether or not the currently set failure determination flag is "1" (step S20). If the failure determination flag is "1", a failure warning lamp arranged in the driver's seat is lit to display the failure of the automatic transmission to the driver (step S2).
1), the failure determination route is set to “0” (step S2)
2) After performing another control operation (step S23), the processing operation ends.

If the failure determination route is "0" in step S18, or if the failure determination flag is "0" in step S20, it is determined that the clutching operation of the automatic transmission is normal. Then, the failure determination route is set to "0" (step S24), and the process proceeds to step S23.

According to the above-described embodiment, it is determined whether or not the select position operated by the select lever and the current select position that is being operated by the actual automatic transmission match. If the detected select positions do not match, it is determined that the automatic transmission has failed, and the warning display lamp is illuminated. Abnormality can be recognized.

In the above-described embodiment,
Although the control device 23 is mounted separately from the automatic transmission 22, the control device 23 having the acceleration sensor 26 built therein may be directly mounted on the automatic transmission 22 as shown in FIG. Is the automatic transmission 22 and the control device 2
It is very economical without the need for a harness between three.

[0055]

As described above, according to the control apparatus for an automatic transmission according to the first aspect of the present invention, the select position selected by the driver, which is detected by the select position detecting means, The position matching determining means determines whether or not the current select position of the automatic transmission detected by the current position detecting means matches. If the selected position does not match, the automatic transmission Can be determined as having failed, and the control device can reliably recognize the failure of the automatic transmission.

According to the control device for an automatic transmission according to the second aspect of the present invention, the current position detecting means can detect a change in acceleration from an acceleration sensor provided in the automatic transmission by a fastening element inside the automatic transmission. Is detected as a shock due to the engagement / release of the control signal, and the current select position is detected based on the detection result, so that the same effect as the effect of the first aspect of the present invention can be obtained.

According to the control device for an automatic transmission according to the third aspect of the present invention, not only can the same effect as the effect of the first aspect of the invention be exerted, but also the warning means is disposed, for example, in the driver's seat. In addition, it corresponds to a display panel or a display lamp for displaying a warning of the failure, an alarm buzzer for notifying the failure by an alarm sound, and the like, so that the driver can also recognize the failure of the automatic transmission.

According to the control device for an automatic transmission according to the fourth aspect of the present invention, not only can the same effect as the effect of the first aspect of the invention be obtained, but also the engagement / disengagement of the fastening element inside the automatic transmission. Can be easily detected, and the accuracy of the failure determination of the automatic transmission can be improved.
Further, by directly attaching the control device provided with the acceleration sensor to the automatic transmission, a harness between the acceleration sensor and the control device becomes unnecessary, and the product cost can be reduced. Harness between the acceleration sensor and the control device is not required, and the product cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to a claim in a control device for an automatic transmission according to the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of a control device for an automatic transmission according to the present invention.

FIG. 3A is an explanatory diagram of a positive-side G change of a current position detection unit in the embodiment. (B) is an explanatory diagram of a G change on the negative side of the current position detection unit in the embodiment.

FIG. 4 is an explanatory diagram simply showing a G change detection operation by a current position detection unit when the automatic transmission performs a normal clutching operation in the embodiment, and FIG.
Is lever operated from neutral to drive,
Or, a positive G change detected when the lever is operated from reverse to neutral, and (b) is detected when the lever is operated from neutral to reverse or when the lever is operated from drive to neutral. This is a negative G change.

FIG. 5 is an explanatory diagram briefly showing a G change detection operation by a current position detection unit when the automatic transmission according to the embodiment performs an abnormal clutching operation, wherein FIG. (B) is the negative G change detected when the lever is operated from neutral to drive, and (c) is the lever change from neutral to reverse. (D) is the G change detected when the lever is operated from drive or reverse to neutral, and (e) is the lever change from drive to neutral. (F) shows a negative G change detected when the lever is operated from reverse to neutral. A reduction.

FIG. 6 is a flowchart showing a processing operation of a control unit in a transmission failure detection process inside the control device of the automatic transmission according to the embodiment.

FIG. 7 is a flowchart showing a processing operation of a control unit in a transmission failure detection process inside the control device of the automatic transmission according to the embodiment.

FIG. 8 is an explanatory diagram showing another embodiment of the control device for the automatic transmission according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Control apparatus 11 Select position detection means 12 Shift pattern control means 13 Current position detection means 14 Position match determination means 15 Failure determination means 16 Warning means (warning display lamp) 17 Control means 22 Automatic transmission 23 Control device 24 Select position signal Detecting unit (select position detecting unit) 25 Mechanical control unit (shift pattern control unit) 26 Acceleration sensor 27 Current position detecting unit (current position detecting unit) 28 Control unit (position match determining unit, failure determining unit, control unit)

Claims (4)

[Claims] 1. A shift position detecting means for detecting a select position as a select position selected by a driver, and a shift for controlling a shift pattern by an automatic transmission according to the select position detected by the select position detecting means. Pattern control means, a current position detection means for detecting a current select position by the automatic transmission, a select position as the driver's intention detected by the select position detection means, and a current position detection means A position coincidence determining means for determining whether or not the detected select position is coincident with the automatic transmission; and a failure of the automatic transmission when the two select positions are not coincident by the position coincidence determining means. Failure determination means Control apparatus for an automatic transmission, characterized by. 2. The present position detecting means detects a change in acceleration from an acceleration sensor provided in the automatic transmission as a shock due to engagement / release of a fastening element inside the automatic transmission, and based on the detection result, The control device for an automatic transmission according to claim 1, wherein the control device detects the select position of the automatic transmission. 3. The apparatus according to claim 1, further comprising a warning unit that warns the failure of the automatic transmission when the failure determination unit determines that the automatic transmission has failed. Control device for automatic transmission. 4. The automatic transmission according to claim 1, wherein the current position detecting means is directly mounted on the automatic transmission or built in a control device, and the control device is directly mounted on the automatic transmission. Automatic transmission control device.