JPH05296336A - Speed change controller of automatic transmission - Google Patents

Abstract

PURPOSE:To improve the reliability of the activation of an emergency shut-off valve in the breakdown in an electric system by providing a parking state judging means to judge a parking state from the operation history of a vehicle and a second emergency shut-off valve controlling means temporarily activating the emergency shut-off valve while the vehicle is in a parking state. CONSTITUTION:A speed change range is switched by electrically activating a speed change range setting hydraulic fluid passage switching valve based on the signal from a speed change range switching section. In the occurrence of abnormality in the speed change range setting hydraulic fluid passage switching valve or speed change range switching section, an emergency shut-off valve is activated to cut-off the communication between a hydraulic pressure source and the speed change range setting hydraulic fluid passage switching valve and forcibly make a transmission neutral. Even if both the speed change range setting hydraulic fluid passage switching valve and speed change range switching section are normal, when the parking state is judged from the operation history of a vehicle, the shut-off valve is temporary activated to confirm normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for an automatic transmission configured to electrically switch a shift range.

[0002]

2. Description of the Related Art Generally, a shift range of an automatic transmission for a vehicle is switched by manually operating a shift range setting oil passage switching valve provided in a hydraulic control section of the automatic transmission. However, Japanese Patent Publication No. 52-10178 discloses a structure in which the gear range switching oil passage switching valve is electrically controlled to switch the gear range. In such a gear shift range that is electrically controlled and has no mechanical link mechanism, there is a possibility that the desired gear shift range cannot be achieved due to a failure of the electric system or the like. As a countermeasure against this, an emergency shutoff valve that forcibly turns the automatic transmission to the neutral state by shutting off the hydraulic pressure from the hydraulic power source to the shift range setting oil passage switching valve when the desired shift range cannot be set is provided. I am trying. However, unless there is a failure in the electrical system, the emergency shutoff valve will not operate for a long period of time.Therefore, if you want to force a neutral state due to a failure in the electrical system, etc. Shut-off valve may be difficult to move. Therefore, a method of confirming the normal operation of the emergency shutoff valve while preventing the foreign matter from being caught in the emergency shutoff valve by temporarily operating the emergency shutoff valve only when the vehicle is stopped and when there is no failure in the electrical system Can be considered.

[0003]

However, if the emergency shut-off valve is actuated when the vehicle is stopped to cause a failure in the neutral state, it may be difficult to start on the road.
It was difficult to confirm normal operation. In view of the above problems, the present invention makes it possible to confirm the normal operation of the emergency cutoff valve only when the driver intends to park the vehicle, and to confirm the normal operation, and to operate the emergency cutoff valve when the electric system fails. The purpose is to increase the reliability of.

[0004]

As shown in FIG. 1, a shift control device for an automatic transmission according to the present invention includes a hydraulic pressure source, a shift range setting oil passage switching valve communicating with the hydraulic pressure source, a hydraulic pressure source and a shift speed. An emergency shutoff valve that can disconnect the communication with the oil passage switching valve for range setting to put the automatic transmission in a neutral state and a signal that electrically operates the oil passage switching valve for gear range setting A shift control device for an automatic transmission, comprising: a shift range switching unit; and an emergency shutoff valve control unit that operates an emergency shutoff valve when the shift range setting oil passage switching valve or the shift range switching unit is abnormal, and a vehicle Operation history detecting means for detecting the operation history of the vehicle, a parking state determining means for determining the parking state from the operation history of the vehicle, and a second emergency shutoff valve control for temporarily operating the emergency shutoff valve in the parking state. And means.

[0005]

In the shift control device for an automatic transmission according to the present invention, the shift range is switched by electrically operating the shift range setting oil passage switching valve based on a signal from the shift range switching section. When there is an abnormality in the shift range setting oil passage switching valve or the shift range switching section, the emergency shutoff valve operates to shut off the communication between the hydraulic power source and the shift range setting oil passage switching valve to force the automatic transmission. Make it neutral. Even when both the shift range setting oil passage switching valve and the shift range switching unit are normal, the emergency shutoff valve is temporarily operated when the parking state is determined from the operation history of the vehicle.

[0006]

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings in order to more specifically clarify the present invention.

FIG. 2 is a system configuration diagram of the first embodiment of the present invention. 10 is an automatic transmission, 20 is a hydraulic control unit of the automatic transmission 10, 30 is a shift control unit of the automatic transmission 10, and 40 is an automatic transmission. 3 illustrates a range control unit of the transmission.

Various signals such as a vehicle speed signal, a throttle opening signal, a brake signal, an engine water temperature signal, and a pattern select signal, and a range signal from the range control unit 40 are input to the shift control unit 30 so that the hydraulic control unit 20 operates. The automatic transmission 1 outputs signals to the solenoid valves S1, S2, SLu.
Automatic switching to 0 gears is performed. A signal is also output to the solenoid valve S3 to control the emergency cutoff valve 60 described later.

The range control unit 40 includes a contact signal of a push button type range select switch 45 and a hydraulic pressure control unit 20.
ON from the ignition key 46 for detecting the detection signal of the manual valve position sensor 59 for detecting the position of the manual valve 50 of FIG.
The OFF signal is input, and the signal is output to the shift control unit 30, the manual valve actuation ECU 44, the range indicator 43, and the voice navigation ECU 41.

The manual valve actuation ECU 44 outputs an actuation signal to a manual valve actuation motor 58 for actuating the manual valve 50 based on the range signal input from the range controller 40. The range indicator 43 is provided on the instrument panel or the like on the front of the driver's seat, and the corresponding display portion is turned on based on the range signal output from the range control unit 40. Further, the voice navigation ECU 41 has a function of receiving a signal from the range control unit 40 and issuing a voice from the speaker 42 to warn the driver when various components fail or return to normal.

FIG. 3 is an example of a hydraulic system diagram of the hydraulic control unit 20, wherein 50 is a manual valve and 60 is an emergency shutoff valve.

A line pressure Pl, which is a basic hydraulic pressure for various controls, is obtained by pumping an oil pump 1 from an oil sump 2 and pressurizing the generated hydraulic pressure to regulate the hydraulic pressure with a regulator valve 3. , The oil cooler 5, and the oil passage 7.

A manual valve 50, which is conventionally known as an oil passage switching valve for setting the range of the automatic transmission 10, is a spool valve, and has ports 53, 54, 56 on one end side and a proximal end side. The port 51 has a friction engagement device 11 such as a clutch or a brake of the automatic transmission 10.
Is connected to a plurality of shift valves 21 that control engagement and disengagement. Further, the line pressure Pl is supplied to the central port 52, and the drain port 55 is further provided at the distal end and the proximal end.
57 is provided. The spool of the manual valve 50 is moved in the axial direction by a manual valve operating motor 58 that operates based on a signal from the manual valve operating ECU 44.

The emergency shutoff valve 60 provided in the oil passage for supplying the line pressure Pl to the manual valve 50 is a line to the manual valve 50 when an abnormality occurs in the manual valve 50 or the like and the desired range cannot be set. The supply of the pressure Pl is cut off. The emergency shutoff valve 60 is a spool valve like the manual valve 50, and has a spool 61 having three lands, a spring 62 for urging the spool 61 to the right in FIG. 2, and a signal pressure chamber 68. is doing. While the oil passage 7 is connected to the input port 66,
The output port 64 has a port 52 of the manual valve 50.
Is connected to the oil passage 9. An oil passage 8 that branches from the oil passage 7 and has an orifice 6 is connected to the port 63 and communicates with the signal pressure chamber 68.

A solenoid valve S3, which operates by receiving a signal from the shift control unit 30, is provided between the orifice 6 on the oil passage 8 and the port 63. Solenoid valve S3
When not energized, the drain port (not shown) of the solenoid valve S3 is closed and the signal pressure chamber 68 of the emergency cutoff valve 60 is closed.
The line pressure Pl acts on the spool 61 to bring the spool 61 into the state shown in the upper side of FIG. Working condition). When the solenoid valve S3 is energized, the drain port of the solenoid valve S3 is opened and the oil pressure is discharged from the oil passage 8. Therefore, the line pressure Pl does not act on the signal pressure chamber 68 of the emergency cutoff valve 60, and the spool 61 is 2, the spool 61 closes the input port 66 and outputs the output port 64 to the drain port 6.
7, and the line pressure Pl is discharged from the oil passage 9 (the emergency shutoff valve 60 is operating).

A hydraulic switch 70 is provided on the oil passage 9 and is turned on when the line pressure Pl is supplied to the oil passage 9.
N, when not supplied, switched to OFF.

Next, the operation of the shift control device of the first embodiment of the present invention having the above-mentioned structure will be described.

The line pressure Pl pumped up from the oil sump 2 by the oil pump 1 and regulated by the regulator valve 3 is sent to the torque converter 4 and further sent from the torque converter 4 to the oil cooler 5. Further, the line pressure Pl enters the input port 66 of the emergency shutoff valve 60 through the oil passage 7.

Normally, when the manual valve 50 is operating normally, the emergency shutoff valve 60 is not operating, so the state shown in the upper side of FIG. 2 is obtained. That is, the solenoid valve S3 is de-energized, the drain port of the solenoid valve S3 is closed, the line pressure Pl is applied to the signal pressure chamber 68, and the input port 66 and the output port 64 are connected.

The line pressure Pl output from the output port 64 passes through the oil passage 9 and enters the port 52 of the manual valve 50. The manual valve 50 operates on the basis of the operation signal from the manual valve operation ECU 44 as described above, and the spool moves in the axial direction by the manual valve operation motor 58 so that the line pressure Pl is routed according to each range. It is switching.

The line pressure Pl selectively output from the ports 53, 54, 56, 51 of the manual valve 50 according to each range is controlled by the solenoid valves S1, S2, SLu based on the signal from the shift control unit 30. As is well known, a friction engagement device 11 such as a clutch or a brake of the automatic transmission 10 is passed through a plurality of operating shift valves 21.
Is engaged and disengaged to set each shift speed of the automatic transmission 10.

When a failure occurs in the manual valve 50 or the electric system and the contact signal of the range select switch 45 and the detection signal of the manual valve position sensor 59 are different, that is, when the desired shift range cannot be set,
As described above, by energizing the solenoid valve S3, the emergency shutoff valve 60 is operated to the state shown in the lower side of FIG. 2, and the supply of the line pressure Pl to the manual valve 50 is shut off to shut down the automatic transmission 10. Force a neutral state.
Then, from the range control unit 40, the voice navigation EC
A signal is output to U41 to warn the driver through the speaker 42.

However, if the emergency shutoff valve 60 is not operated for a long period of time, it will not operate when it must be operated due to foreign matter being caught in the valve. Therefore, even when the manual valve 50 is operating normally. , Operate the emergency shutoff valve 60. Therefore, when the driver parks with the intention of parking, that is, when the ignition key 46 is turned off for a certain period of time and then the ignition key is turned on, the emergency shutoff valve 60 is normally operated by operating as described above during the parking range. Check the operation.
At this time, when the line pressure Pl is supplied to the oil passage 9 and the hydraulic switch 70 is turned on even though the solenoid valve S3 is energized to operate the emergency shutoff valve 60, the emergency switch is turned on. Since the shutoff valve 60 does not operate and has a failure, the driver is warned by the speaker 42.

On the contrary, after activating the emergency shutoff valve 60,
Although the solenoid valve S3 is de-energized to deactivate it, if the line pressure Pl is not supplied to the oil passage 9 and the hydraulic switch is off, the emergency shutoff valve 60 fails on the operating side. Since it means that the driver is doing so, the driver is warned by the speaker 42.

Next, the control contents of the first embodiment of the present invention will be explained based on the flow charts of FIGS. 4 and 5.

First, data and flags are initialized to read necessary data, and the process proceeds to step 1.

In step 1, it is judged whether the ignition key 46 is ON or OFF in order to judge whether the engine is operating or stopped. When it is determined that the engine is running and the ignition key 46 is ON, the routine proceeds to step 2.

At step 2, it is judged whether the flag Fg is 1 or 0. The flag Fg has been set to 1 in step 3 described later if the ignition key 46 was previously turned on, and reset to 0 in step 7 described later if it was previously turned off. If the engine has been running for a while and the flag Fg is determined to be 1, the process proceeds to step 9 in FIG.

When it is determined in step 1 that the engine is stopped and the ignition key 46 is off, the process proceeds to step 6.

At step 6, it is judged whether the flag Fg is 1 or 0. If the flag Fg is determined to be 1, it means that the engine was previously operating and the engine has just been stopped. Therefore, the process proceeds to step 7, and the flag Fg is set.
Is reset to 0, the count of the engine OFF timer Tgoff is started, and the control is ended. Engine OF
The F timer Tgoff is a timer that measures the stop time of the engine.

If the flag Fg is judged to be 0 in step 6, the engine has been stopped for a while and the control is ended.

If the flag Fg is judged to be 0 in step 2, it means that the engine has been stopped before and the engine has just been started. Therefore, the process proceeds to step 3 and the flag Fg is set to 1 and step 4 Proceed to.

In step 4, it is judged whether the engine OFF timer Tgoff is T0 or more. Engine O
If the FF timer Tgoff is determined to be T0 or more,
Since it can be determined that the engine has been stopped by the driver, the operation proceeds to step 5 to allow the operation of the emergency shutoff valve 60, the flag Fa is set to 1, and the operation proceeds to step 9 of FIG. The flag Fa is a flag that is set to 1 when the operation of the emergency shutoff valve 60 is permitted.

If it is determined in step 4 that the engine OFF timer Tgoff is not equal to or greater than T0, it can be determined that the engine has not been stopped by the driver, and the flag Fa is left as it is to proceed to step 9 in FIG.

In step 9, it is determined whether the flag Fn is 1 or 0. For the flag Fn, the emergency shutoff valve 60 was previously O
If it is N, it is set to 1 in step 13 described later, and if it was previously OFF, it is reset to 0 in step 18 described later. If the emergency shutoff valve 60 has been turned off and the flag Fn has been determined to be 0, the routine proceeds to step 10.

In step 10, it is determined whether the hydraulic switch 70 is ON or OFF. The hydraulic switch 70 is O when the emergency cutoff valve 60 is operated to cut off the oil passage 9.
In the FF, when the emergency shutoff valve 60 is not operated and the oil passage 9 is not shut off, it is ON. If the flag Fn is judged to be 0 in step 9 and the hydraulic switch is judged to be ON in step 10, it means that the emergency shutoff valve 60 is normal, so the routine proceeds to step 11.

In step 11, it is determined whether the select range is the parking range. If it is determined to be in the parking range, the process proceeds to step 12.

At step 12, it is judged whether the flag Fa is 1 or 0. If the flag Fa is determined to be 1, the operation of the emergency cutoff valve 60 is permitted, and therefore the routine proceeds to step 13, where the emergency cutoff valve 60 is turned on to operate the emergency cutoff valve 60. Also, the count of the emergency shutoff valve ON timer Tnon is started, and the flag Fn is set to 1.
To end the control. Emergency shutoff valve ON timer T
non is a timer that measures the operating time of the emergency shutoff valve 60.

In steps 11 and 12, the flag Fa is set to 0 when the select range is other than the parking range.
If it is determined that the control ends.

In step 9, the emergency shutoff valve 60 is turned off.
When it is determined that the flag Fn is 1 in N, the process proceeds to step 17.

In step 17, it is determined whether the hydraulic switch 70 is ON or OFF. If the flag Fn is judged to be 1 in step 9 and the hydraulic switch 70 is judged to be off in step 16, it means that the emergency cutoff valve 60 is operating normally and cuts off the oil passage 9. Then, the emergency shutoff valve 60 is turned off, the count of the emergency shutoff valve OFF timer Tnoff is started, the flag Fn is reset to 0, and the flag F is reset.
a is reset to 0, and the control ends. Emergency shutoff valve OF
The F timer Tnoff is a timer for measuring the non-operation time of the emergency shutoff valve 60.

On the contrary, in step 9, the flag Fn is judged to be 1 and in step 17, the hydraulic switch 70 is turned off.
If it is determined to be F, the process proceeds to step 19.

In step 19, it is judged whether the emergency shutoff valve ON timer Tnon is T2 or more. If the emergency shutoff valve ON timer Tnon is determined to be T2 or more, it means that the emergency shutoff valve 60 has a malfunction on the non-operating side. Therefore, the process proceeds to step 20, the range switching is prohibited, and the driver is warned. Then, the routine proceeds to step 21, where fail control of the emergency cutoff valve 60 is performed and the control is terminated.

If it is determined in step 19 that the emergency shutoff valve ON timer Tnon is T2 or less, the control is terminated.

When the flag Fn is judged to be 0 in step 9 and the hydraulic switch is judged to be off in step 10, the routine proceeds to step 14.

In step 14, the emergency shutoff valve is turned off.
It is determined whether the timer Tnoff is T2 or more. If the emergency shutoff valve OFF timer Tnoff is judged to be T2 or more, it means that the emergency shutoff valve 60 has a malfunction on the operating side. Therefore, the routine proceeds to step 15, and the driver is warned that the vehicle cannot run, and the routine proceeds to step 16. Then, the fail release control of the emergency shutoff valve 60 is performed, and the control is ended.

In step 14, the emergency shutoff valve is turned off.
When it is determined that the timer Tnoff is T2 or less, the control ends.

As described above, in the first embodiment of the present invention, the determination of the parking state can be made by detecting whether the engine stop time is a predetermined time or longer.

Next, a second embodiment of the present invention will be described. Since the system configuration diagram of the second embodiment is basically the same as that of the first embodiment, the description of the system configuration diagram is omitted, and the control contents different from those of the first embodiment will be described below based on the flowcharts of FIGS. 5 and 6. Explain.

First, data and flags are initialized to read necessary data, and the process proceeds to step 30.

In step 30, it is judged whether the ignition key 46 is ON or OFF in order to judge whether the engine is operating or stopped. When it is determined that the engine is running and the ignition key 46 is ON, the routine proceeds to step 31.

In step 31, the flag Fg is 1 or 0.
Make a decision. Flag Fg is ignition key 46
If it was previously ON, it was set to 1 in step 32 described later, and if it was previously OFF, it was set to 0 in step 36 described later.
Has been reset to. If the flag Fg is determined to be 1 because the engine has been running for a while, step 9 in FIG.
Proceed to.

If it is determined in step 30 that the engine is stopped and the ignition key 46 is off, the process proceeds to step 33.

In step 33, the flag Fg is 1 or 0.
Make a decision. If the flag Fg is determined to be 1, it means that the engine was previously operating and the engine has just stopped, and therefore the routine proceeds to step 34.

In step 34, it is determined whether the select range is the parking range. If the select range is determined to be the parking range, it means that the driver has set the parking range and then stopped the engine. Therefore, it can be determined that the engine has been stopped by the driver, and the emergency shutoff valve 60 is activated. In order to permit, the process proceeds to step 35, sets the flag Fa to 1, proceeds to step 36, resets the flag Fg to 0, and ends the control.

On the contrary, if it is determined in step 34 that the select range is other than the parking range, it means that the engine was stopped before the driver set it to the parking range, so the engine was not stopped by the driver. Since it can be determined that the flag Fa remains as it is, step 3
6, the flag Fg is reset to 0 and the control ends.

When the flag Fg is judged to be 0 in step 33, the engine has been stopped for a while, and the control is ended.

If the flag Fg is judged to be 0 in step 31, it means that the engine has been stopped before and the engine has just been started.
2, the flag Fg is set to 1 and step 9 in FIG.
Proceed to.

Since step 9 and subsequent steps in FIG. 5 are the same as those in the first embodiment, the description thereof will be omitted.

As described above, in the second embodiment of the present invention, the determination of the parking state can be made by detecting whether or not the vehicle is in the parking range when the engine is stopped.

Although the embodiments of the present invention have been described in detail above, it goes without saying that the present invention is not limited to such specific examples, and within the scope of the claims. Various embodiments are intended to be included.

[0062]

As described above, according to the present invention, the operation history of the vehicle is detected, and when it is determined that the vehicle is in the parking state intended by the driver, the emergency shutoff valve is temporarily operated to perform the emergency operation. Since the normal operation of the shut-off valve is confirmed, even if the emergency shut-off valve fails while the normal operation is being confirmed and the automatic transmission becomes neutral and the vehicle remains parked, Therefore, there is no need to move and it is possible to confirm the normal operation of the emergency shutoff valve without affecting the own vehicle and other vehicles.

[Brief description of drawings]

[Figure 1] Claim correspondence diagram

FIG. 2 is a system configuration diagram of an embodiment of the present invention.

FIG. 3 is a hydraulic system diagram of the hydraulic control unit 20.

FIG. 4 is a flowchart of the first embodiment of the present invention.

FIG. 5 is a flowchart of first and second embodiments of the present invention.

FIG. 6 is a flowchart of the second embodiment of the present invention.

[Explanation of symbols]

 10 ... Automatic transmission 20 ... Hydraulic control unit 30 ... Shift control unit 40 ... Range control unit 50 ... Manual valve 60 ... Emergency shutoff valve

Claims (1)

[Claims] 1. An automatic transmission is set to a neutral state by cutting off communication between a hydraulic pressure source, a shift range setting oil passage switching valve communicating with the hydraulic pressure source, and the hydraulic pressure source and shift range setting oil passage switching valve. Emergency shutoff valve, a shift range switching unit that outputs a signal to electrically operate the shift range setting oil passage switching valve, and an abnormality in the shift range setting oil passage switching valve or shift range switching unit. In a shift control device for an automatic transmission including: an emergency shutoff valve control means for activating an emergency shutoff valve; an operation history detection means for detecting an operation history of a vehicle; and determining a parking state from an operation history of the vehicle. A shift control device for an automatic transmission, comprising: a parking state determination means; and a second emergency shutoff valve control means for temporarily activating an emergency shutoff valve when the vehicle is parked.