JP2003294134A - Shift position detecting device of automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shift position detecting device that performs a display with assured safety even if a range position different from the actual range position is displayed because of a device failure or the like. <P>SOLUTION: In this device, an inhibitor switch detects the on/off statuses of a plurality of contacts. The device also includes a range position switch map setting part where a setting is made not to match a combination pattern when a contact outputs different statuses with the combination pattern of the on/off statuses of the plurality of contacts representing a parking range, out of combination patterns of the on/off statuses of the plurality of contacts representing a neutral range. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inhibitor switch that outputs a signal corresponding to a range position selected by a driver operating a shift lever.

[0002]

2. Description of the Related Art When a signal output from an inhibitor switch signal is input to an automatic transmission control unit (hereinafter referred to as ATCU), a shift position detecting device for an automatic transmission detects a range position based on the signal. Judge,
It is output to an indicator or the like. The inhibitor switch is composed of a plurality of contacts, and a member that responds to the movement of the shift lever operated by the driver selects a combination of these contacts, thereby determining the range position.

[0003]

As described above, in the case of selecting a combination of a plurality of contacts, if a signal different from the normal state is output due to a failure of the contacts, a signal that does not correspond to any range position is output. If there is, it will be judged as a failure,
If a signal corresponding to another range position matches, an incorrect display may occur, so even if an incorrect display occurs due to a contact failure, it will always be displayed on the safe side for the driver. There was a demand for such combinations.

The present invention has been made by paying attention to the problems of the prior art as described above. In a shift position detecting device for an automatic transmission, for example, a device malfunctions and a range position different from an actual range position is detected. It is an object of the present invention to provide a shift position detection device that displays a display with safety even if it is displayed.

[0005]

According to another aspect of the present invention, there is provided a shift lever range position selected by a driver's operation, at least an axle being fixed and a friction engaging element in an automatic transmission. , A reverse range representing a state in which the reverse gear is selected, a neutral range representing a state in which all friction engagement elements in the automatic transmission are released without fixing the axle, and a plurality of Inhibitor switch for detecting a drive range for selecting the forward gear according to the traveling situation, and control for calculating and outputting a display signal for displaying at least the selected range position based on a signal output from the inhibitor switch In a shift position detecting device for an automatic transmission including a controller, a plurality of inhibitor switches are provided. A switch for detecting the on / off state of a point, and when at least one contact of the combination patterns of the on / off states of a plurality of contacts representing at least the neutral range outputs a different state to the controller. A combination position and a range position switch map setting unit set so that the combination pattern of the on / off states of the plurality of contacts representing the parking range do not match are provided, and the control controller sets the contact positions detected by the inhibitor switch. The on / off status is compared with the combination pattern of the contact on / off status for each range position set in the range position switch map setting section, and when a matching combination pattern is searched, a match is found. Outputs the range position detection signal that represents the pattern It is characterized in.

According to a second aspect of the present invention, in the shift position detecting device for an automatic transmission according to the first aspect, the inhibitor switch is used to turn on / off the four contacts S1, S2, S3 and S4. As a switch for detection, a combination of the on / off states of the four contacts representing the neutral range is a combination of S1 and S2 in the on state and S3 and S4 in the off state, and the four contacts representing the parking range are on.・ A combination of off situations
It is characterized in that all the contacts S1 to S4 are in a combination of OFF states.

[0007]

In the range position detecting device for the automatic transmission according to the first aspect of the present invention, the range position switch map setting section provided in the control controller turns on at least a plurality of contacts representing the neutral range. Of the combination patterns of the off-states, the combination pattern when any one contact outputs different states and the combination pattern of the on-off states of the plurality of contacts representing the parking range are set so as not to match. There is. And in the controller,
The contact on / off status detected by the inhibitor switch is compared with the combination pattern of contact on / off status for each range position set in the range position switch map setting section, and a matching combination pattern is searched. Then, the range position detection signal representing the matched pattern is output. Therefore, when the driver selects the neutral range, even if any one contact outputs a different situation, it outputs a signal different from the parking range signal, so the neutral range is selected. Nevertheless, the parking range signal is never output. Therefore, it is possible to output the range position detection signal that the driver does not misunderstand.

According to the second aspect of the invention, the inhibitor switch is a switch for detecting the on / off state of the four contacts S1, S2, S3 and S4. As a result, 24 kinds of output signals can be expressed. At this time, turning on the four contacts that represent the neutral range
The combination of off-states is that S1 and S2 are on,
The combination of S3 and S4 is in the off state, and the combination of the on / off states of the four contacts representing the parking range is the combination of all the contacts S1 to S4 in the off state. This allows any one of the contacts S1 to S4 to be
Even if one of them is stuck in the off state or the on state, a signal different from the parking range is output in the neutral range. Therefore, it is possible to output the range position detection signal that the driver does not misunderstand.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A range position detecting device for an automatic transmission according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a system diagram showing a range position detecting device in an embodiment. In the figure, 1 is a shift lever operated by a driver to select a range position, 2 is an inhibitor switch for detecting the selected range position, 3 is an ATCU, and 4 is an indicator for displaying the current range position to the driver. is there.

The inhibitor switch 2 has four terminals S1.
~ S4, ground terminal GND, four terminals and ground terminal G
It is composed of a pin 2a extending over ND. The pin 2a slides on the terminals in conjunction with the shift lever 1 to create an on / off state of each terminal according to the selected range position. The on / off state of each terminal S1 to S4 is ATCU3.
To the ATCU, which outputs the signal corresponding to the range position.
Output to 3.

The ATCU 3 is provided with a range position switch map. When the output signal of the inhibitor switch signal is compared with the switch map and a matching combination pattern is searched for, a range position based on the matching pattern is searched. The signal is output to the indicator 4 to display the corresponding range position.

FIG. 2 is a range position switch map of the ATCU 3 in each range. In the figure, ○ indicates switch OFF and ● indicates switch ON.

In the P (parking) range, S1 to S4
All terminals are switched off. In the P-R (intermediate between parking and reverse) range, the terminals S1 to S3 are switched off and the terminal S4 is switched on. In the R (reverse) range, the S1 and S4 terminals are switch ON, S2 and
The S3 terminal is switched off. In the N-R (intermediate between neutral and reverse) range, the S1, S2 and S4 terminals are switched on and the S3 terminal is switched off. In N (neutral) range, S1 and S2 terminals are switch O
The N, S3 and S4 terminals are turned off. In the ND (intermediate between neutral and drive) range, the S1 to S3 terminals are switched on and the S4 terminal is switched off. D
In the (drive) range, all of the S1 to S4 terminals are switched on. In 3 ranges, S1 terminal is switch OF
The F and S2 to S4 terminals are turned on. In the 2 range, the S1 and S4 terminals are switched off and the S2 and S3 terminals are switched on. In the 2-1 (intermediate between 2 and 1) range, the S1, S2 and S4 terminals are switched off and the S3 terminal is switched on. In one range, the S1 and S3 terminals are switched on and the S2 and S4 terminals are switched off.

Next, the operation will be described. [In case of S1 terminal failure] FIG. 3 is a map showing a display signal input to the indicator 4 when the S1 terminal is stuck ON or OFF. The hatched portion in the figure represents a range in which a signal different from that in the normal state is output.

When the S1 terminal is stuck ON, the P range →
? (Therefore, it is judged as a failure and not displayed on the indicator), P-R range → R range, 3 range → D range,
Since the range is changed from the 2 range to the ND range and the 2-1 range to the 1 range, the driver is not misunderstood. When the N range is selected, the N range is displayed on the indicator.

When the S1 terminal is stuck OFF, the R range → PR range, NR range →? , N range →? , N
-D range-> 2 range, D range-> 3 range, 1 range-> 2-1 range, so there is no great misunderstanding to the driver. When the N range is selected, nothing is displayed on the indicator.

[In case of S2 terminal failure] In FIG. 4, the S2 terminal is ON.
Alternatively, it is a map showing a display signal input to the indicator 4 when the OFF state is fixed.

When the S2 terminal is stuck ON, the P range →
? , P-R range →? , R range → NR range 2-1
Range → 2 range, 1 range → ND range, so that the driver is not misunderstood. Also, N
When the range is selected, the indicator shows N range.

When the S2 terminal is stuck OFF, the N-R range → R range, the N range →? , N-D range → 1 range, D range →? 3 ranges →? Since the range is from 2 range to 2-1 range, there is no great misunderstanding to the driver.

[When the S3 terminal fails] In FIG. 5, the S3 terminal is ON.
Alternatively, it is a map showing a display signal input to the indicator 4 when the OFF state is fixed. If the S3 terminal is stuck ON, the P range → 2-1 range, P-R range →? , R
Range →? , NR range → D range, N range → N-
Since it is in the D range, it does not give a big misunderstanding to the driver.

When the S3 terminal is stuck OFF, the N-D range → N range, the D range → N-R range, the 3 range →
? 2 ranges →? 2-1 range → P range, 1 range →? Therefore, the driver will not be misunderstood. When the N range is selected, the N range is displayed on the indicator.

[When the S4 terminal fails] In FIG. 6, the S4 terminal is ON.
Alternatively, it is a map showing a display signal input to the indicator 4 when the OFF state is fixed.

When the S4 terminal is stuck ON, the P range →
P-R range, N range-> N-R range, N-D range-> D range, 2 range-> 3 range, 2-1 range->? ,
1 range →? Therefore, the driver will not be misunderstood.

When the S4 terminal is stuck OFF, the P-R range → P range, the R range →? , N-R range-> N range, D range-> N-D range, 3 range-> 2 range, there is no great misunderstanding to the driver.

As described above, the shift position detecting device for the automatic transmission according to the first embodiment does not correspond to any combination when the terminals S1 to S4 are fixed on or off. In the case of a combination, it is possible to prevent misunderstanding to the driver by judging that it is a failure, and even if it is displayed in the same combination as other range positions, the safety is always ensured. Only the displayed information can be displayed. In particular, even if any one of the contacts S1 to S4 is stuck in the off state or the on state,
In the neutral range, a signal different from that in the parking range is output. Therefore, even if the driver is in the neutral range, the driver will not misunderstand that it is the parking range, and the highly safe range position detection signal can be output.

[Brief description of drawings]

FIG. 1 is a system diagram showing a range position detecting device according to an embodiment.

FIG. 2 is a switch map of a display signal for displaying a range position calculated and output by the ATCU.

FIG. 3 is a map showing a display signal input to the indicator when the S1 terminal is stuck on or off.

FIG. 4 is a map showing a display signal input to the indicator when the S2 terminal is stuck ON or OFF.

FIG. 5 is a map showing a display signal input to the indicator when the S3 terminal is stuck on or off.

FIG. 6 is a map showing a display signal input to the indicator when the S4 terminal is fixed to ON or OFF.

[Explanation of symbols]

1 shift lever 2 inhibitor switch 2a pin 3 Automatic transmission control unit (ATCU) 4 indicators S1 to S4 terminals GND Ground terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuru Fujioka             No. 1-1 Yoshiwara Takaracho, Fuji City, Shizuoka Prefecture             Co-Trans Technology Co., Ltd. F term (reference) 3J552 MA01 NA01 PB03 PB10 QC01                       QC03 QC10 RA02 TA10 VA61W                       VA62W VA63W VA65W

Claims (2)

[Claims] 1. A parking range, which is a range position of a shift lever selected by a driver's operation, represents a state in which at least an axle is fixed and all frictional engagement elements in an automatic transmission are released, and a reverse gear. Is selected, the reverse range represents the selected state, the neutral range represents the state in which all frictional engagement elements in the automatic transmission are released without fixing the axle, and the drive range that selects multiple forward gears according to the driving situation. A shift position detection device for an automatic transmission, which includes: an inhibitor switch for detecting a signal, and a controller for calculating and outputting a display signal for displaying at least the range position selected based on a signal output from the inhibitor switch. In the device, the inhibitor switch is a switch that detects the on / off state of a plurality of contacts. However, among the combination patterns of ON / OFF states of at least a plurality of contacts representing the neutral range, a combination pattern when any one contact outputs a different status to the controller and a plurality of combinations representing the parking range. The range position switch map setting unit is set so as not to match the combination pattern of the contact on / off states of the contacts, and the controller controls the contact on / off states detected by the inhibitor switch and the range position switch. Compare with the combination pattern of the ON / OFF status of the contact for each range position set in the map setting section,
A shift position detecting device for an automatic transmission, which outputs a range position detection signal representing the matched pattern when a matching combination pattern is searched. 2. The shift position detecting device for an automatic transmission according to claim 1, wherein the inhibitor switches are S1, S2, S3 and S4.
A switch for detecting the on / off state of the four contacts, and the combination of the on / off states of the four contacts representing the neutral range is S3 when S1 and S2 are in the on state.
And S4 are in the off state combination, and the combination of the on / off states of the four contacts representing the parking range is a combination in which all the contacts of S1 to S4 are in the off state. Position detection device.