JP4529123B2 - Fault detection device for automatic transmission - Google Patents

Fault detection device for automatic transmission Download PDF

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JP4529123B2
JP4529123B2 JP2004164340A JP2004164340A JP4529123B2 JP 4529123 B2 JP4529123 B2 JP 4529123B2 JP 2004164340 A JP2004164340 A JP 2004164340A JP 2004164340 A JP2004164340 A JP 2004164340A JP 4529123 B2 JP4529123 B2 JP 4529123B2
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range
travel range
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failure
hydraulic pressure
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JP2005344805A (en
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章 高木
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Denso Corp
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Denso Corp
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Description

本発明は、自動変速機用故障検出装置に関する。   The present invention relates to a failure detection device for an automatic transmission.

運転者によるシフトセレクタの操作によって選択された走行レンジを検出するセレクタ検出手段が知られている（例えば、特許文献１参照）。セレクタ検出手段が検出した走行レンジを、例えばフロントパネル内に表示することにより、運転者に現在の走行レンジを知らせることができる。
特開２００３−２９４１３４号公報 A selector detection means for detecting a travel range selected by a driver operating a shift selector is known (see, for example, Patent Document 1). By displaying the travel range detected by the selector detection means on the front panel, for example, the driver can be informed of the current travel range.
JP 2003-294134 A

しかしながら、特許文献１では、セレクタ検出手段が故障し、運転者が選択した走行レンジとセレクタ検出手段が示す走行レンジとが異なっていても、セレクタ検出手段が示す走行レンジが運転者が選択した走行レンジとは異なる他の走行レンジと一致する場合は、レンジ検出の故障を検出できない。
本発明は上記問題を解決するためになされたものであり、運転者によるシフトセレクタの操作に応じたセレクタ検出信号が示す走行レンジと、摩擦要素に加わる液圧を検出する液圧検出信号が示す走行レンジとの不一致から、レンジ検出故障を検出する自動変速機用故障検出装置を提供することを目的とする。 However, in Patent Document 1, even if the selector detection unit fails and the travel range selected by the driver is different from the travel range indicated by the selector detection unit, the travel range indicated by the selector detection unit is the travel selected by the driver. If it coincides with another traveling range different from the range, a failure in range detection cannot be detected.
The present invention has been made to solve the above-described problem, and shows a traveling range indicated by a selector detection signal corresponding to a driver's operation of a shift selector and a hydraulic pressure detection signal for detecting a hydraulic pressure applied to the friction element. An object of the present invention is to provide a failure detection device for an automatic transmission that detects a range detection failure from a mismatch with a travel range.

請求項１から６記載の発明によると、走行レンジ検出手段により自動変速機の入力軸の回転数と出力軸の回転数との比から検出された走行レンジと、摩擦要素に加わる液圧を検出する液圧検出信号が示す走行レンジと、運転者によるシフトセレクタの操作に応じたセレクタ検出信号が示す走行レンジとの不一致により、レンジ検出故障が発生したことを検出できる。具体的には、走行レンジ検出手段が検した走行レンジと液圧検出信号が示す走行レンジとの不一致からレンジ検出故障を検出する。また、走行レンジ検出手段により検出された走行レンジと液圧検出信号が示す走行レンジとの不一致からレンジ検出故障が検出されなかった場合、セレクタ検出信号が示す走行レンジと液圧検出信号が示す走行レンジとの不一致からレンジ検出故障を検出する。
ここで、例えば車両が前進または後進しているときに、摩擦要素に加わる液圧の液圧検出信号が示す走行レンジと、運転者によるシフトセレクタの操作に応じたセレクタ検出信号が示す走行レンジとが一致せず、運転者がシフトセレクタを操作して選択した走行レンジと、車両が前進または後進している動きとが一致しないと、運転者が戸惑う恐れがある。 According to the first to sixth aspects of the present invention, the traveling range detected from the ratio between the rotational speed of the input shaft and the rotational speed of the output shaft of the automatic transmission by the traveling range detecting means and the hydraulic pressure applied to the friction element are detected. It is possible to detect that a range detection failure has occurred due to a mismatch between the travel range indicated by the hydraulic pressure detection signal and the travel range indicated by the selector detection signal corresponding to the operation of the shift selector by the driver. Specifically, a range detection failure is detected from a mismatch between the travel range detected by the travel range detection means and the travel range indicated by the hydraulic pressure detection signal. In addition, when a range detection failure is not detected due to a mismatch between the travel range detected by the travel range detection means and the travel range indicated by the hydraulic pressure detection signal, the travel indicated by the selector detection signal and the travel indicated by the hydraulic pressure detection signal are detected. A range detection failure is detected from a mismatch with the range.
Here, for example, when the vehicle is moving forward or backward, the travel range indicated by the hydraulic pressure detection signal of the hydraulic pressure applied to the friction element, and the travel range indicated by the selector detection signal corresponding to the operation of the shift selector by the driver If the driving range selected by the driver operating the shift selector does not match the movement of the vehicle moving forward or backward, the driver may be confused.

そこで請求項２記載の発明によると、前進レンジおよび後進レンジで係合する摩擦要素に加わる液圧を液圧検出手段が検出するので、故障検出手段は車両が前進または後進するときのレンジ検出故障を検出し、レンジ故障に対応した処理を行うことができる。
請求項３記載の発明によると、故障検出手段は、走行レンジ検出手段が検出した走行レンジと液圧検出信号が示す走行レンジとが不一致であった場合、液圧検出手段の故障と判定する。また、故障検出手段は、走行レンジ検出手段により検出された走行レンジと液圧検出信号に基づいて検出された走行レンジとが一致し、液圧検出信号に基づいて検出された走行レンジとセレクタ検出信号に基づいて検出される走行レンジとが不一致であった場合、セレクタ検出手段の故障であると判定できる。 Therefore, according to the second aspect of the invention, since the forward range and the hydraulic pressure of the hydraulic pressure applied to the friction element engages the reverse range detection means detects, fault detecting means range detection when the vehicle moves forward or backward A failure can be detected and processing corresponding to the range failure can be performed.
According to a third aspect of the present invention, the failure detecting means determines that the hydraulic pressure detecting means has failed when the traveling range detected by the traveling range detecting means does not match the traveling range indicated by the hydraulic pressure detection signal. In addition, the failure detection means is configured such that the travel range detected by the travel range detection means matches the travel range detected based on the hydraulic pressure detection signal, and the travel range detected based on the hydraulic pressure detection signal and the selector detection. If the travel range detected based on the signal does not match, it can be determined that the selector detection means is out of order.

請求項４および５記載の発明によると、運転者は警告手段によりレンジ検出故障の発生を知ることができる。
請求項６記載の発明によると、液圧検出手段は、摩擦要素の係合または解放によりオフ信号またはオン信号を出力する液圧スイッチであるから、液圧検出手段の構成が簡単である。 According to the inventions of claims 4 and 5, the driver can know the occurrence of the range detection failure by the warning means.
According to the sixth aspect of the present invention, since the hydraulic pressure detecting means is a hydraulic pressure switch that outputs an off signal or an on signal by engagement or release of the friction element, the configuration of the hydraulic pressure detecting means is simple.

以下、本発明の実施の形態を図に基づいて説明する。
本発明の自動変速機用故障検出装置の一実施形態を図１に示す。本実施形態においては、図２に示す係合関係にしたがって変速が制御される。図２から図４において示す走行レンジは次の意味である。Ｐレンジはパーキングレンジ、Ｒレンジは後進レンジ、Ｐ−ＲレンジはＰとＲとの中間位置、Ｎレンジはニュートラルレンジ、Ｒ−ＮレンジはＲとＮとの中間位置、Ｄレンジは前進レンジ、Ｎ−ＤレンジはＮとＤとの中間位置を示している。また、図２において○は、後述する油圧スイッチ４０がオン、つまり摩擦要素が係合していることを表し、図３および図４において○は、後述する端子Ｓ１、Ｓ２、Ｓ３の出力がオンであることを表している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
One embodiment of a failure detection apparatus for an automatic transmission according to the present invention is shown in FIG. In the present embodiment, the shift is controlled according to the engagement relationship shown in FIG. The travel range shown in FIGS. 2 to 4 has the following meaning. P range is parking range, R range is reverse range, P-R range is intermediate position between P and R, N range is neutral range, RN range is intermediate position between R and N, D range is forward range, The ND range indicates an intermediate position between N and D. 2 indicates that a hydraulic switch 40, which will be described later, is turned on, that is, a friction element is engaged. In FIGS. 3 and 4, the output of terminals S1, S2, S3, which will be described later, is ON. It represents that.

図１において、リバースクラッチ（Ｒ／Ｃ）１、ローリバースブレーキ（ＬＲ／Ｂ）２、ロークラッチ（Ｌ／Ｃ）３、２−４ブレーキ（２−４／Ｂ）４、ハイクラッチ（Ｈ／Ｃ）５は油圧により係合または解放される摩擦要素であり、シフトレバー３０によりＤレンジまたはＲレンジが選択されたときに係合する（図２参照）。符号１１〜１５は、各摩擦要素に加わる油圧を切り換える制御手段である。制御手段１１〜１５は、例えば、電磁弁と、電磁弁の指示圧により油路を切り換えるスプール弁とで構成される。マニュアル弁２０は、運転者が操作して手動で走行レンジを選択するシフトセレクタとしてのシフトレバー３０とワイヤ等で機械的に連結している。シフトレバー３０により走行レンジが切り換わると、マニュアル弁２０は、走行レンジに応じて変位し、制御手段１１〜１５に供給する油圧をライン圧またはドレイン２２の油圧に切り換える。油圧スイッチ４０は、各摩擦要素に加わる油圧の検出信号を、設定した検出油圧を閾値としてオン、オフ信号で出力する。液圧検出手段としての油圧スイッチ４０は、各摩擦要素に加わる油圧が係合油圧の場合はオンになり、解放油圧の場合はオフになる。   In FIG. 1, reverse clutch (R / C) 1, low reverse brake (LR / B) 2, low clutch (L / C) 3, 2-4 brake (2-4 / B) 4, high clutch (H / C) 5 is a friction element that is engaged or released by hydraulic pressure, and is engaged when the D range or R range is selected by the shift lever 30 (see FIG. 2). Reference numerals 11 to 15 are control means for switching the hydraulic pressure applied to each friction element. The control means 11-15 are comprised by the solenoid valve and the spool valve which switches an oil path with the instruction | indication pressure of an electromagnetic valve, for example. The manual valve 20 is mechanically connected by a wire or the like to a shift lever 30 as a shift selector that is operated by a driver and manually selects a travel range. When the travel range is switched by the shift lever 30, the manual valve 20 is displaced according to the travel range, and the hydraulic pressure supplied to the control means 11 to 15 is switched to the line pressure or the drain 22 hydraulic pressure. The hydraulic switch 40 outputs an oil pressure detection signal applied to each friction element as an ON / OFF signal using the set oil pressure as a threshold value. The hydraulic pressure switch 40 as the hydraulic pressure detecting means is turned on when the hydraulic pressure applied to each friction element is the engagement hydraulic pressure, and turned off when the hydraulic pressure is applied to the release hydraulic pressure.

セレクタ検出手段としてのインヒビタスイッチ５０は、シフトレバー３０とワイヤで機械的に連結された可動部５２と、可動部５２と接触する端子Ｓ１、Ｓ２、Ｓ３とを有している。可動部５２がシフトレバー３０の操作に応じて変位すると、可動部５２と接触する端子Ｓ１、Ｓ２、Ｓ３の組み合わせが変化する。これにより、インヒビタスイッチ５０は、図３に示すように、シフトレバー３０により選択された走行レンジに応じたセレクタ検出信号を端子Ｓ１、Ｓ２、Ｓ３から出力する。   The inhibitor switch 50 as the selector detecting means has a movable part 52 mechanically connected to the shift lever 30 by a wire, and terminals S1, S2, and S3 that come into contact with the movable part 52. When the movable portion 52 is displaced according to the operation of the shift lever 30, the combination of the terminals S1, S2, and S3 that come into contact with the movable portion 52 changes. Thereby, the inhibitor switch 50 outputs a selector detection signal corresponding to the travel range selected by the shift lever 30 from the terminals S1, S2, and S3, as shown in FIG.

故障検出手段である制御装置（以下、ＥＣＵという）６０は、制御プログラムを記憶したＲＯＭまたはＥＥＰＲＯＭ等のメモリ、制御プログラムを実行するＣＰＵ等を有している。ＥＣＵ６０は、油圧スイッチ４０の油圧検出信号およびインヒビタスイッチ５０のセレクタ検出信号を入力している。ＥＣＵ６０は、油圧スイッチ４０の油圧検出信号から、図２に示す係合関係に基づいて各摩擦要素の係合状態を判定し、摩擦要素の係合状態が示す走行レンジを検出する。また、ＥＣＵ６０は、インヒビタスイッチ５０のセレクタ検出信号から、図３に示すセレクタ検出信号と走行レンジとの対応関係に基づいてシフトレバー３０により選択された走行レンジを検出する。ＥＣＵ６０は、インヒビタスイッチ５０のセレクタ検出信号から検出した走行レンジを例えばフロントパネルに表示し、運転者に現在の走行レンジを知らせる。 Controller (hereinafter, ECU hereinafter) is a fault detection means 60, a memory of ROM or EEPROM or the like for storing a control program, and a CPU or the like executing the control program. The ECU 60 inputs a hydraulic pressure detection signal of the hydraulic switch 40 and a selector detection signal of the inhibitor switch 50. The ECU 60 determines the engagement state of each friction element from the oil pressure detection signal of the hydraulic switch 40 based on the engagement relationship shown in FIG. 2, and detects the travel range indicated by the engagement state of the friction element. Further, the ECU 60 detects the travel range selected by the shift lever 30 from the selector detection signal of the inhibitor switch 50 based on the correspondence relationship between the selector detection signal and the travel range shown in FIG. The ECU 60 displays the travel range detected from the selector detection signal of the inhibitor switch 50 on the front panel, for example, and informs the driver of the current travel range.

次に、ＥＣＵ６０が実行する制御プログラムのうち、故障検出ルーチンについて説明する。故障検出ルーチンは、タイマ割り込み等により実行される。
まず、自動変速機の入力軸の回転数と出力軸の回転数との比から、自動変速機が実際に選択している走行レンジを検出する（ステップ１００）。次に、油圧スイッチ４０の油圧検出信号から図２に基づいて走行レンジを検出する。ステップ１００で検出した走行レンジと、ステップ１０２において検出した走行レンジとが不一致であれば、油圧スイッチ４０の故障と判定し、ステップ１０６において油圧スイッチ故障警告灯７０（図１参照）を点灯して本ルーチンを終了する。 Next, a failure detection routine in the control program executed by the ECU 60 will be described. The failure detection routine is executed by a timer interrupt or the like.
First, the travel range actually selected by the automatic transmission is detected from the ratio between the rotation speed of the input shaft and the rotation speed of the output shaft of the automatic transmission (step 100). Next, the travel range is detected from the hydraulic pressure detection signal of the hydraulic switch 40 based on FIG. If the travel range detected in step 100 and the travel range detected in step 102 do not match, it is determined that the hydraulic switch 40 has failed. In step 106, the hydraulic switch failure warning lamp 70 (see FIG. 1) is turned on. This routine ends.

ステップ１００で検出した走行レンジと、ステップ１０２において検出した走行レンジとが一致すれば油圧スイッチ４０は正常であると判定し、次のステップ１０８において、インヒビタスイッチ５０のセレクタ検出信号から、図３に基づいて走行レンジを検出する。
ここで、例えばインヒビタスイッチ５０の端子Ｓ１とＥＣＵ６０との結線が断線していると、図４に示すように、端子Ｓ１の出力はシフトレバー３０により選択された走行レンジに関わらずオフになる。したがって、運転者がシフトレバー３０でＤレンジを選択した場合、図４に示すようにインヒビタスイッチ５０のセレクタ検出信号はＲ−Ｎレンジが選択されたことを示し、図２に示すように油圧スイッチ４０の油圧検出信号はＤレンジが選択されたことを示す。 If the travel range detected in step 100 matches the travel range detected in step 102, it is determined that the hydraulic switch 40 is normal. In the next step 108, from the selector detection signal of the inhibitor switch 50, FIG. Based on this, the travel range is detected.
Here, for example, if the connection between the terminal S1 of the inhibitor switch 50 and the ECU 60 is disconnected, the output of the terminal S1 is turned off regardless of the travel range selected by the shift lever 30, as shown in FIG. Therefore, when the driver selects the D range with the shift lever 30, the selector detection signal of the inhibitor switch 50 indicates that the RN range has been selected as shown in FIG. 4, and the hydraulic switch as shown in FIG. A hydraulic pressure detection signal of 40 indicates that the D range has been selected.

このように、油圧スイッチ４０の油圧検出信号と、インヒビタスイッチ５０のセレクタ検出信号とからそれぞれ検出する走行レンジが不一致であれば、ステップ１１０からステップ１１２に移行し、インヒビタスイッチ故障警告灯７０（図１参照）を点灯する。
ステップ１１０において、油圧スイッチ４０の油圧検出信号と、インヒビタスイッチ５０のセレクタ検出信号とからそれぞれ検出する走行レンジが一致すると判定すると、本ルーチンを終了する。 Thus, if the travel ranges detected from the hydraulic pressure detection signal of the hydraulic switch 40 and the selector detection signal of the inhibitor switch 50 do not match, the routine proceeds from step 110 to step 112, where the inhibitor switch failure warning lamp 70 (FIG. 1) is lit.
If it is determined in step 110 that the travel ranges detected from the hydraulic pressure detection signal of the hydraulic switch 40 and the selector detection signal of the inhibitor switch 50 match, this routine ends.

以上説明した上記実施形態では、実際に自動変速機が選択している走行レンジと、油圧スイッチ４０の油圧検出信号により検出する走行レンジとを照合することにより、走行レンジが不一致であれば、油圧スイッチ４０の故障、つまりレンジ検出故障を検出できる。また、油圧スイッチ４０が正常であり、油圧スイッチ４０の油圧検出信号により検出する走行レンジと、インヒビタスイッチ５０のセレクタ検出信号により検出する走行レンジとを照合することにより、走行レンジが不一致であれば、インヒビタスイッチ５０の故障、つまりレンジ検出故障を検出できる。   In the above-described embodiment, if the travel range does not match by comparing the travel range actually selected by the automatic transmission with the travel range detected by the hydraulic pressure detection signal of the hydraulic switch 40, the hydraulic pressure A failure of the switch 40, that is, a range detection failure can be detected. Further, if the travel range does not match by comparing the travel range detected by the hydraulic pressure detection signal of the hydraulic switch 40 with the travel range detected by the selector detection signal of the inhibitor switch 50, the hydraulic switch 40 is normal. The failure of the inhibitor switch 50, that is, the range detection failure can be detected.

（他の実施形態）
上記実施形態に対し、油圧スイッチ４０の故障を検出せず、油圧スイッチ４０の油圧検出信号から検出する走行レンジと、インヒビタスイッチ５０のセレクタ検出信号から検出する走行レンジとが不一致であれば、レンジ検出故障を検出して警告灯を点灯してもよい。また、警告灯を点灯する代わりに警告音を鳴らしてもよい。また、油圧スイッチ４０の油圧検出信号から検出する走行レンジと、インヒビタスイッチ５０のセレクタ検出信号から検出する走行レンジとが不一致であれば、警告灯を点灯するともに、制御手段１１〜１５を制御して摩擦要素を全て解放し、車両の走行を禁止してもよい。 (Other embodiments)
If the travel range detected from the hydraulic pressure detection signal of the hydraulic switch 40 and the travel range detected from the selector detection signal of the inhibitor switch 50 do not detect the failure of the hydraulic switch 40 and does not detect the failure of the hydraulic switch 40, the range A detection failure may be detected and a warning light may be turned on. Moreover, you may sound a warning sound instead of lighting a warning lamp. If the travel range detected from the hydraulic pressure detection signal of the hydraulic switch 40 and the travel range detected from the selector detection signal of the inhibitor switch 50 do not match, the warning light is turned on and the control means 11-15 are controlled. All the friction elements may be released to prohibit the vehicle from traveling.

上記実施形態では、液圧検出手段として、摩擦要素に加わる油圧を所定油圧を閾値として係合側でオン、解放側でオフする油圧スイッチ４０を採用したが、油圧の変化に応じて出力レベルが変化する油圧センサを液圧検出手段としてもよい。
上記実施形態では、マニュアル弁２０は、シフトレバー３０とワイヤで機械的に連結しているが、シフトレバー３０で選択された走行レンジに応じて例えばモータ等により電気的にマニュアル弁２０を移動させる所謂シフトバイワイヤの構成でも、本発明を適用してレンジ検出故障を検出できる。 In the above-described embodiment, the hydraulic pressure switch 40 is used as the hydraulic pressure detection means. The hydraulic switch 40 is turned on on the engagement side and turned off on the release side with the predetermined hydraulic pressure as the threshold, but the output level varies depending on the change in the hydraulic pressure. The changing hydraulic pressure sensor may be used as the hydraulic pressure detecting means.
In the above embodiment, the manual valve 20 is mechanically connected to the shift lever 30 with a wire. However, the manual valve 20 is electrically moved by, for example, a motor or the like according to the travel range selected by the shift lever 30. Even in a so-called shift-by-wire configuration, a range detection failure can be detected by applying the present invention.

本発明の一実施形態による自動変速機用故障検出装置を示す構成図である。It is a block diagram which shows the failure detection apparatus for automatic transmission by one Embodiment of this invention. 各走行レンジにおける油圧スイッチのオン、オフと摩擦要素の係合状態との関係を示す説明図である。It is explanatory drawing which shows the relationship between ON / OFF of the hydraulic switch in each driving | running | working range, and the engagement state of a friction element. 油圧スイッチのオン、オフ状態と各走行レンジとの関係を示す説明図である。It is explanatory drawing which shows the relationship between the ON / OFF state of a hydraulic switch, and each driving | running | working range. 油圧スイッチの故障時における油圧スイッチのオン、オフ状態と各走行レンジとの関係を示す説明図である。It is explanatory drawing which shows the relationship between the ON / OFF state of a hydraulic switch at the time of a failure of a hydraulic switch, and each traveling range. 故障検出ルーチンを示すフローチャートである。It is a flowchart which shows a failure detection routine.

符号の説明Explanation of symbols

１ Ｒ／Ｃ（摩擦要素）、２ ＬＲ／Ｂ（摩擦要素）、３ Ｌ／Ｃ（摩擦要素）、４ ２−４／Ｂ（摩擦要素）、５ Ｈ／Ｃ（摩擦要素）、４０ 油圧スイッチ（液圧検出手段）、５０ インヒビタスイッチ（セレクタ検出手段）、６０ ＥＣＵ（故障検出手段）
1 R / C (friction element), 2 LR / B (friction element), 3 L / C (friction element), 4 2-4 / B (friction element), 5 H / C (friction element), 40 Hydraulic switch (hydraulic pressure detecting means), 50 inhibitor switch (selector detecting means) 60 ECU (fault detecting means)

Claims (6)

複数の摩擦要素を係合および解放することにより変速を切り換える自動変速機の故障検出装置において、
前記自動変速機の入力軸の回転数と出力軸の回転数との比から走行レンジを検出する走行レンジ検出手段と、
前記摩擦要素に加わる液圧を検出し、液圧検出信号を出力する液圧検出手段と、
運転者によるシフトセレクタの操作に応じたセレクタ検出信号を出力するセレクタ検出手段と、
レンジ検出故障を検出する故障検出手段と、
を備え、
前記故障検出手段は、
前記走行レンジ検出手段が検出した走行レンジと前記液圧検出信号が示す走行レンジとの不一致からレンジ検出故障を検出し、
前記走行レンジ検出手段が検出した走行レンジと前記液圧検出信号が示す走行レンジとの不一致からレンジ検出故障が検出されなかった場合、前記セレクタ検出信号が示す走行レンジと前記液圧検出信号が示す走行レンジとの不一致からレンジ検出故障を検出することを特徴とする自動変速機用故障検出装置。 In an automatic transmission failure detection device that switches a shift by engaging and releasing a plurality of friction elements,
Travel range detection means for detecting a travel range from the ratio of the rotational speed of the input shaft and the rotational speed of the output shaft of the automatic transmission;
Fluid pressure detection means for detecting fluid pressure applied to the friction element and outputting a fluid pressure detection signal;
Selector detection means for outputting a selector detection signal according to the operation of the shift selector by the driver;
A fault detecting means for detecting the ovens detection failure,
Equipped with a,
The failure detection means includes
A range detection failure is detected from a mismatch between the travel range detected by the travel range detection means and the travel range indicated by the hydraulic pressure detection signal;
When a range detection failure is not detected due to a mismatch between the travel range detected by the travel range detection means and the travel range indicated by the fluid pressure detection signal, the travel range indicated by the selector detection signal and the fluid pressure detection signal indicate A fault detection device for an automatic transmission that detects a range detection fault from a mismatch with a running range . 前記液圧検出手段は、前進レンジおよび後進レンジで係合する摩擦要素に加わる液圧を検出することを特徴とする請求項１記載の自動変速機用故障検出装置。   The failure detection device for an automatic transmission according to claim 1, wherein the hydraulic pressure detection means detects a hydraulic pressure applied to a friction element engaged in a forward range and a reverse range. 前記故障検出手段は、
前記走行レンジ検出手段が検出した走行レンジと前記液圧検出信号が示す走行レンジとが不一致であった場合、前記液圧検出手段の故障と判定し、
前記走行レンジ検出手段が検出し走行レンジと前記液圧検出信号が示す走行レンジと、の不一致からレンジ故障が検出されなかった場合であって、前記液圧検出信号が示す走行レンジと、前記セレクタ検出信号が示す走行レンジとが不一致であった場合、前記セレクタ検出手段の故障と判定することを特徴とする請求項１または２記載の自動変速機用故障検出装置。 The failure detection means includes
When the travel range detected by the travel range detection means and the travel range indicated by the hydraulic pressure detection signal do not match, it is determined that the hydraulic pressure detection means has failed,
The range detected by the travel range detection means and the travel range indicated by the hydraulic pressure detection signal is not in accordance with a mismatch between the travel range and the travel range indicated by the hydraulic pressure detection signal. The failure detection device for an automatic transmission according to claim 1 or 2 , wherein if the travel range indicated by the detection signal is inconsistent, it is determined that the selector detection means has failed. 前記セレクタ検出手段の故障を知らせる警告手段を備えることを特徴とする請求項３記載の自動変速機用故障検出装置。   4. The failure detection device for an automatic transmission according to claim 3, further comprising warning means for notifying the failure of the selector detection means. 前記レンジ検出故障の発生を知らせる警告手段を備えることを特徴とする請求項１から３のいずれか一項記載の自動変速機用故障検出装置。   The automatic transmission failure detection device according to any one of claims 1 to 3, further comprising warning means for notifying the occurrence of the range detection failure. 前記液圧検出手段は、前記摩擦要素の係合または解放によりオフ信号またはオン信号を出力する液圧スイッチであることを特徴とする請求項１から５のいずれか一項記載の自動変速機用故障検出装置。
6. The automatic transmission for an automatic transmission according to claim 1, wherein the hydraulic pressure detecting means is a hydraulic pressure switch that outputs an off signal or an on signal when the friction element is engaged or released. Fault detection device.
JP2004164340A 2004-06-02 2004-06-02 Fault detection device for automatic transmission Expired - Fee Related JP4529123B2 (en)

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JP5335563B2 (en) * 2009-06-02 2013-11-06 本田技研工業株式会社 Hydraulic switch failure detection device
KR101472246B1 (en) * 2011-03-25 2014-12-11 닛산 지도우샤 가부시키가이샤 Control device for automatic transmission
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KR101923932B1 (en) * 2016-11-02 2018-11-30 현대자동차주식회사 Electronic transmission and method for displaying gear status using the same

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