JP3656004B2 - Failure detection device for hydraulic pressure detection device - Google Patents

Failure detection device for hydraulic pressure detection device Download PDF

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Publication number
JP3656004B2
JP3656004B2 JP7497799A JP7497799A JP3656004B2 JP 3656004 B2 JP3656004 B2 JP 3656004B2 JP 7497799 A JP7497799 A JP 7497799A JP 7497799 A JP7497799 A JP 7497799A JP 3656004 B2 JP3656004 B2 JP 3656004B2
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JP
Japan
Prior art keywords
hydraulic pressure
detection
failure diagnosis
solenoid valve
pressure detection
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP7497799A
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Japanese (ja)
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JP2000266176A (en
Inventor
要 末広
弘之 湯浅
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株式会社日立製作所
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actual hydraulic pressure applied to each friction engagement element in a direct-acting automatic transmission that performs a shift by controlling a supply hydraulic pressure to each friction engagement element (clutch, brake) to a target hydraulic pressure by each solenoid valve. The present invention relates to a failure diagnosis device for diagnosing a failure in a hydraulic pressure detection device (hydraulic sensor or hydraulic switch) used for detecting a fault.
[0002]
[Prior art]
In recent years, automatic transmissions for vehicles, which do not use a one-way clutch, have been attracting attention by performing hydraulic control to simultaneously engage and disengage at least two friction engagement elements. Shifting is performed by controlling the supply hydraulic pressure to each friction engagement element to the target hydraulic pressure by each solenoid valve.
[0003]
Here, a hydraulic pressure sensor (or a hydraulic switch) is used as a hydraulic pressure detection device to detect the actual hydraulic pressure to each friction engagement element for feedback control and the like. It is necessary to diagnose the failure of the hydraulic sensor (or hydraulic switch).
[0004]
As a failure diagnosis device for a hydraulic sensor in an automatic transmission, particularly for a belt-type continuously variable transmission, as shown in JP-A-6-213316, the output of the hydraulic sensor regardless of the change in the target hydraulic pressure. When the motor does not change for a predetermined period, the slip state of the transmission belt of the belt type continuously variable transmission is detected, and when no slip has occurred, there is one that diagnoses a failure of the hydraulic sensor.
[0005]
However, this is because the failure diagnosis of the hydraulic sensor is limited to the belt type continuously variable transmission, and it is necessary to monitor the slip state of the belt.
[0006]
[Problems to be solved by the invention]
Under the circumstances, the present invention compares the target hydraulic pressure with the actual hydraulic pressure in order to perform failure diagnosis of the hydraulic pressure detection device in the direct-acting automatic transmission, and based on the difference, for example, the target hydraulic pressure Even if the actual oil pressure does not change and the difference is large, it is diagnosed that the oil pressure detection device is malfunctioning. Even if the solenoid valve operates normally even if it is mixed, the oil pressure is not properly controlled. Therefore, the failure diagnosis is performed after the oil pressure is properly controlled, thereby improving the accuracy of the failure diagnosis. The purpose is to let you.
[0007]
[Means for Solving the Problems]
The present invention relates to an oil pressure detection used for detecting an actual oil pressure to each friction engagement element in an automatic transmission that performs a shift by controlling a supply oil pressure to each friction engagement element to a target oil pressure by each solenoid valve. It is assumed that this is a failure diagnosis device for diagnosing device failures.
[0008]
Here, in the first invention, as shown in FIG. 1A, after the power is turned on, the first solenoid valve detects the end of the engagement / release operation of each friction engagement element (initial operation end detection). And a means (diagnosis permitting means) for permitting failure diagnosis of each hydraulic pressure detection device after completion of the first fastening / release operation.
[0009]
Further, in the second invention, as shown in FIG. 1B, after the power is turned on, a means for detecting the selection from the stop range to the traveling range (select detection means) and a predetermined solenoid at the time of detection of the selection A means for precharging by actuating a valve (precharge means) and a means for permitting a failure diagnosis of a corresponding hydraulic pressure detecting device after the precharge (diagnosis permitting means) are provided. .
[0010]
The hydraulic pressure detection device to be diagnosed is generally a hydraulic pressure sensor, but may be a hydraulic pressure switch.
Further, as a failure diagnosis method, failure diagnosis is generally performed based on the difference between the target hydraulic pressure and the actual hydraulic pressure.
[0011]
【The invention's effect】
According to the first invention, after the power is turned on, after the first engagement / release operation of each frictional engagement element by each solenoid valve, the failure diagnosis of each hydraulic pressure detection device is permitted, whereby the second engagement operation. Since the influence of air is removed, the accuracy of failure diagnosis can be improved.
[0012]
According to the second invention, after the power is turned on, when a selection from the stop range to the travel range is detected, a predetermined solenoid valve is operated to perform pre-diagnosis for failure diagnosis. By permitting failure diagnosis of the hydraulic pressure detection device, the influence of air can be positively removed by precharging, so that the accuracy of failure diagnosis can be improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 2 is a system diagram of an automatic transmission for a vehicle to which a failure diagnosis device for a hydraulic pressure detection device according to the present invention is applied. The output torque of an engine 1 mounted on a vehicle (not shown) is driven via the automatic transmission 2. Transmitted to the wheel.
[0014]
The automatic transmission 2 has a configuration in which a shift is performed by controlling the supply of working hydraulic pressure to a friction engagement element such as a clutch and a brake by a solenoid valve unit 3, and specifically, as shown in FIG. As described above, the output torque of the engine is input via the torque converter T / C, and includes a front planetary gear set 83 and a rear planetary gear set 84, and as a friction engagement element, a reverse clutch R / C, High clutch H / C, band brake B / B, low & reverse brake L & R / B, forward clutch FWD / C. In FIG. 3, reference numeral 81 denotes an input shaft of the transmission, 82 denotes an output shaft of the transmission, Ne denotes an engine rotational speed, Nt denotes a turbine rotational speed, and No denotes an output shaft rotational speed.
[0015]
In the above configuration, as shown in FIG. 4, the reverse clutch R / C, the high clutch H / C, the band brake B / B, the low & reverse brake L & R / B, and the forward clutch FWD / C are engaged and released. For example, during the upshift from the 3rd speed to the 4th speed, the forward clutch FWD / C is disengaged and the band brake B / B is engaged at the same time. That is, the automatic transmission 2 is configured to execute a shift (so-called clutch-to-clutch shift) in which at least two friction engagement elements are simultaneously engaged and released by hydraulic control without using a one-way clutch. ing.
[0016]
Therefore, as shown in FIG. 5, for each friction engagement element 20, a solenoid valve 30 connected to a line pressure (source pressure) source and a drain is provided, and the opening or opening time of each solenoid valve 30 ( By controlling the duty), the hydraulic pressure applied to each friction engagement element 20 is controlled. In addition, a hydraulic pressure sensor 50 is provided for each friction engagement element 20, and the actual hydraulic pressure to each friction engagement element 20 can be detected.
[0017]
The control unit 4 that controls the solenoid valve unit 3 (each solenoid valve 30) stores a table indicating the correlation between the drive current of each solenoid valve 30 and the hydraulic pressure. When the target hydraulic pressure is calculated, the target hydraulic pressure is calculated. Is obtained by table conversion, and the drive current of each solenoid valve 30 is controlled.
[0018]
In the engagement control of the frictional engagement element such as the clutch, as shown in FIG. 6, first, after precharging and making the frictional engagement element invalid stroke until just before the contact, the working oil pressure is generated to the extent that the engagement force is generated. The return pressure (critical pressure) is maintained, and thereafter the hydraulic pressure is controlled so that the engagement of the friction engagement element proceeds at a predetermined timing.
[0019]
Here, even if the correlation between the solenoid valve drive current and the actually obtained oil pressure changes due to changes in temperature conditions, the control unit 4 uses the actual oil pressure detection result to accurately control the target oil pressure. Based on this, the control characteristic of the solenoid valve is corrected, and FIG. 7 shows a flow chart of the shift control including such correction.
[0020]
The flowchart of FIG. 7 shows a routine executed for one solenoid valve, and the same processing is performed individually for the other solenoid valves.
[0021]
In step 1 (denoted as S1 in the figure, the same applies hereinafter), the target hydraulic pressure at the time of shifting is calculated.
In step 2, a drive current corresponding to the target hydraulic pressure is obtained based on a table indicating a correlation between the target hydraulic pressure and the drive current.
[0022]
In step 3, the drive current is supplied to the solenoid valve to perform hydraulic control.
In step 4, the detection result of the hydraulic sensor that detects the actual hydraulic pressure controlled by the solenoid valve is read.
[0023]
In step 5, a correction for rewriting the table indicating the correlation between the target hydraulic pressure and the drive current is executed from the detected correlation between the actual hydraulic pressure and the drive current, and from the next time onward, based on the rewritten table. To determine the drive current.
[0024]
For example, when the actual oil pressure is lower than the target oil pressure, the table is rewritten so that the oil pressure corresponding to the drive current is uniformly reduced. Instead of rewriting the conversion table, a correction value for the drive current may be set, and the drive current may be corrected with the correction value in the next shift using the same solenoid valve. The conversion table may be rewritten. This is substantially synonymous with the correction of the drive current described above.
[0025]
According to the above configuration, since the control characteristics are corrected for each solenoid valve and hydraulic control is performed, it is possible to perform hydraulic control that is not affected by temperature conditions and variations for each solenoid valve.
[0026]
Next, a failure diagnosis device for a hydraulic pressure detection device (hydraulic sensor) according to the present invention will be described with reference to a flowchart of FIG. 8 showing a first embodiment of failure diagnosis performed by the control unit 4.
[0027]
The flowchart in FIG. 8 shows a routine executed for one hydraulic sensor, and the same processing is performed individually for the other hydraulic sensors.
[0028]
In step 11, it is determined whether or not an ignition key switch which is a power switch is ON.
In step 12, whether or not the first engagement / release operation (initial operation) of the first friction engagement element after power-on by the solenoid valve corresponding to the first hydraulic sensor to be diagnosed is completed, that is, the solenoid valve is operated once ( It is determined whether or not (ON → OFF) has ended. This is determined from the command signal. This part corresponds to the initial operation end detection means.
[0029]
If the initial fastening / release operation is not completed, it is considered that there is an influence of air mixing, and the failure diagnosis of the hydraulic sensor is not performed.
If the initial fastening / release operation is completed, it is considered that the influence of air mixing has been removed, the failure diagnosis of the hydraulic sensor is permitted, and the routine proceeds to step 13. This part corresponds to the diagnosis permission means.
[0030]
In step 13, a failure diagnosis of the hydraulic sensor is performed. Specifically, the target oil pressure is compared with the actual oil pressure. Based on the difference, for example, the target oil pressure has changed, but the actual oil pressure does not change and the difference is large. Diagnose.
[0031]
That is, as shown in FIG. 9, since there is a possibility that proper hydraulic pressure control may not be performed due to air mixing into the hydraulic system until the first engagement / release operation is completed, failure diagnosis is prohibited, Failure diagnosis is permitted after the first time. From the second time onward, the influence of air is removed, so that the accuracy of failure diagnosis can be improved.
[0032]
FIG. 10 shows a flowchart of the second embodiment of failure diagnosis.
In step 21, it is determined whether or not an ignition key switch which is a power switch is ON. If it is ON, the process proceeds to step 22.
[0033]
In step 22, the selection from the stop range (N) after the power is turned on to the travel range (D) is detected, and if the N → D selection is detected, the process proceeds to step 23. This part corresponds to the selection detection means.
[0034]
In step 23, the solenoid valve is operated to perform pre-diagnosis for failure diagnosis. That is, a certain level of hydraulic pressure is supplied to the hydraulic system to eliminate the influence of air. This portion corresponds to play charge means.
[0035]
In step 24, it is determined whether or not the precharge is completed. When the precharge is completed, failure diagnosis of the hydraulic sensor is permitted and the process proceeds to step 25. This part corresponds to the diagnosis permission means.
[0036]
In step 25, failure diagnosis of the hydraulic sensor is performed. Specifically, the target oil pressure is compared with the actual oil pressure. Based on the difference, for example, the target oil pressure has changed, but the actual oil pressure does not change and the difference is large. Diagnose.
[0037]
In this way, when N → D select is detected after the power is turned on, a predetermined solenoid valve is operated to perform pre-diagnosis for fault diagnosis, and after this pre-charge, fault diagnosis of the corresponding hydraulic pressure detection device is permitted. By doing so, the influence of air can be positively removed by precharging, and the accuracy of failure diagnosis can be improved.
[0038]
In the above embodiment, the case where the diagnosis target hydraulic pressure detection device is a hydraulic pressure sensor whose output continuously changes in accordance with the actual hydraulic pressure has been described, but a predetermined threshold value is set in accordance with the actual hydraulic pressure. The present invention is also applicable to a hydraulic switch whose output is turned ON / OFF.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing the configuration of the present invention. FIG. 2 is a system diagram of an automatic transmission for a vehicle. FIG. 3 is a detailed configuration diagram of the automatic transmission. FIG. 5 is a diagram showing a state of shifting according to a combination of states. FIG. 5 is a hydraulic circuit diagram for each friction engagement element. FIG. 6 is a time chart showing a state of hydraulic control at the time of shifting. Flowchart showing first embodiment of failure diagnosis [FIG. 9] Time chart showing diagnosis permission timing [FIG. 10] Flowchart showing second embodiment of failure diagnosis [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Automatic transmission 3 Solenoid valve unit 4 Control unit 20 Friction engagement element 30 Solenoid valve 50 Hydraulic sensor

Claims (5)

  1. In an automatic transmission that controls the supply hydraulic pressure to each friction engagement element to a target hydraulic pressure by each solenoid valve and performs a shift, a failure of a hydraulic pressure detection device used to detect the actual hydraulic pressure to each friction engagement element is detected. A device for diagnosis,
    Means for detecting the end of engagement / release operation of each friction engagement element by each first solenoid valve after power-on;
    Means for allowing failure diagnosis of each hydraulic pressure detection device after completion of the first fastening / release operation;
    A fault diagnosis device for a hydraulic pressure detection device, comprising:
  2. In an automatic transmission that controls the supply hydraulic pressure to each friction engagement element to a target hydraulic pressure by each solenoid valve and performs a shift, a failure of a hydraulic pressure detection device used to detect the actual hydraulic pressure to each friction engagement element is detected. A device for diagnosis,
    A means for detecting a selection from the stop range to the travel range after turning on the power;
    Means for operating a predetermined solenoid valve to perform pre-charging upon detection of the select;
    Means for allowing failure diagnosis of the corresponding hydraulic pressure detection device after the precharge;
    A fault diagnosis device for a hydraulic pressure detection device, comprising:
  3. 3. The failure diagnosis device for a hydraulic pressure detection device according to claim 1, wherein the hydraulic pressure detection device to be diagnosed is a hydraulic pressure sensor.
  4. 3. The failure diagnosis device for a hydraulic pressure detection device according to claim 1, wherein the hydraulic pressure detection device to be diagnosed is a hydraulic pressure switch.
  5. The failure diagnosis device for a hydraulic pressure detection device according to any one of claims 1 to 4, wherein failure diagnosis is performed based on a difference between the target hydraulic pressure and the actual hydraulic pressure.
JP7497799A 1999-03-19 1999-03-19 Failure detection device for hydraulic pressure detection device Expired - Fee Related JP3656004B2 (en)

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Application Number Priority Date Filing Date Title
JP7497799A JP3656004B2 (en) 1999-03-19 1999-03-19 Failure detection device for hydraulic pressure detection device

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Application Number Priority Date Filing Date Title
JP7497799A JP3656004B2 (en) 1999-03-19 1999-03-19 Failure detection device for hydraulic pressure detection device

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Publication number Priority date Publication date Assignee Title
JP3560925B2 (en) 2001-04-12 2004-09-02 本田技研工業株式会社 Linear solenoid valve and abnormality detection device and method for hydraulic device using the same
JP4082272B2 (en) 2003-05-15 2008-04-30 トヨタ自動車株式会社 Abnormality judgment device for vehicle hydraulic control circuit
JP4529123B2 (en) * 2004-06-02 2010-08-25 株式会社デンソー Fault detection device for automatic transmission
JP2007057057A (en) * 2005-08-26 2007-03-08 Jatco Ltd Failure detector of automatic transmission
JP4853088B2 (en) * 2006-04-04 2012-01-11 井関農機株式会社 Tractor
JP4831187B2 (en) 2009-03-05 2011-12-07 トヨタ自動車株式会社 Automatic transmission abnormality detection device
KR101448752B1 (en) * 2012-11-26 2014-10-13 현대자동차 주식회사 Method and apparatus for diagnosing failure of an oil pressure sensor for hybrid vehicle
JP6006884B2 (en) * 2013-09-30 2016-10-12 ジヤトコ株式会社 Hydraulic switch failure judgment device
JP6124828B2 (en) * 2014-03-28 2017-05-10 ジヤトコ株式会社 Control device for vehicle transmission
CN105021382B (en) * 2014-06-06 2017-11-21 中国海洋石油总公司 Subsea production tree hydraulic valve performance on-line monitoring and diagnostic system and method
JP2018100674A (en) * 2015-03-23 2018-06-28 ジヤトコ株式会社 Controller of vehicular automatic transmission

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