JP3239562B2 - Control device for range switching valve in automatic transmission - Google Patents

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 a range switching valve in an automatic transmission.

[0002]

2. Description of the Related Art In an automatic transmission, selection of each traveling range of forward and backward traveling, a neutral range and a parking range is performed by switching a range switching valve (manual valve). The range switching valve is generally switched by manual operation of a shift lever. However, an automatic transmission having a configuration in which the switching is performed by electrical control has already been proposed.

[0003] Japanese Utility Model Publication No. Sho 62-20345 discloses an example of an automatic transmission in which a range switching valve is switched by a motor. This automatic transmission includes a range position sensor that detects an operation range position, and a contact switch type switching valve position sensor that detects a spool position of a range switching valve, and the spool position is an operation range position (= target range position). When it is determined that
A stop command is given to the motor.

[0004]

By the way, even if a stop command is given to the motor, the motor does not stop immediately, but the motor (strictly speaking, the entire drive system of the range switching valve including the motor) coasts. In some cases, the operating position of the range switching valve deviates from the appropriate range position, and the operating oil pressure cannot be properly switched.

The present invention has been made in view of such a conventional problem, and provides a stop command to a motor in consideration of a coasting portion of a drive system including the motor, so that the spool can be properly positioned. It is an object of the present invention to provide a control device for a range switching valve for an automatic transmission, which can surely position the control valve.

[0006]

Means for Solving the Problems of claims 1 invention, FIG. 1
2, a range position sensor for detecting a target range position from an operation range selected by an operation means, an actuator for switching an operation position of a range switching valve of an automatic transmission, and the range switching valve A contact switch type switching valve position sensor for detecting an actual operating position of the range change valve in an automatic transmission, wherein the actuator is stopped based on a target range position detected by the range position sensor. Setting means for setting a reference operating position for setting in association with an output of the switching valve position sensor,
Determining means for determining whether or not the actual operating position of the range switching valve detected by the switching valve position sensor has reached the reference operating position; timer means for measuring time; and the actuator having the actual operating position A drive command in a direction to be the reference operation position is given, and after the determination means determines that the actual operation position has reached the reference operation position, the actuator is kept in the same direction as the direction for a predetermined time based on the time measurement result of the time measurement means. Control means for giving a drive command in the direction or the reverse direction, and thereafter giving a stop command to the actuator ;
Actuator based on the output of the switching valve position sensor
Operating speed calculating means for calculating the operating speed of the actuator;
The predetermined time is set based on the operation speed of the router
The above problem is solved by providing a predetermined time setting means .

According to a second aspect of the present invention, in the first aspect of the invention, the reference operating position setting means sets the reference operating position to a switching valve position sensor corresponding to a range position before the target range position. The control means gives a drive command to the actuator in a direction in which the actual operation position becomes the reference operation position, and the actual operation position reaches the reference operation position by the determination means. After the determination is made, the above problem is solved by continuously giving a drive command in the same direction as the above direction to the actuator for a predetermined time based on the result of the timing by the timing means.

According to a third aspect of the present invention, in the first aspect of the invention, the reference operating position setting means sets the reference operating position in relation to an output of a switching valve position sensor corresponding to a target range position. The control means gives a drive command to the actuator in a direction in which the actual operating position becomes the reference operating position, and when the determining means determines that the actual operating position has reached the reference operating position. ,
The above object is achieved by providing a stop command to the actuator, and then providing a drive command in the direction opposite to the direction for a predetermined time to the actuator based on the result of the timing by the timing means.

[0009]

According to a fourth aspect of the present invention, there is provided a range position sensor for detecting a target range position from an operation range selected by an operation means, as shown in FIG.
An actuator for switching the operating position of the range switching valve of the automatic transmission, and a switching valve position detecting means including a linear sensor such as a potentiometer that outputs a signal corresponding to at least the actual operating position of the range switching valve, and
A predetermined amount of play is provided in the power transmission path between the actuator and the range switching valve, and the range switching valve is fixed at a plurality of range positions by a detent mechanism.
In a control device for a range switching valve in an automatic transmission having a configuration to be positioned, a reference operating position for stopping the actuator is output from the switching valve position detecting means based on a target range position detected by the range position sensor. Setting means for setting in association with
Determining means for determining whether the actual operating position of the range switching valve detected by the switching valve position detecting means has reached the reference operating position; time measuring means for measuring time; Gives a drive command in the direction to become the reference operation position, gives a stop command to the actuator when it is determined by the determination means that the actual operation position has reached the reference operation position, and then, based on the timing result of the timing means Control means for giving a stop command to the actuator after giving a drive command in the opposite direction to the actuator for a predetermined time, and the linear sensor at the time of stopping the range switching valve immediately before giving the drive command in the reverse direction to the actuator And the linear value when the range switching valve stops at the target range position due to the action of the detent mechanism. The present invention solves the above problem by providing overshoot amount detection means for detecting a difference from the output value of the power supply, and predetermined time setting means for setting the predetermined time based on the difference detected by the overshoot amount detection means. It is a solution.

The invention of claim 5 has a range position sensor for detecting a target range position from an operation range selected by the operation means, as shown in FIG.
An actuator for switching the operating position of the range switching valve of the automatic transmission, and a switching valve position detecting means for detecting the actual operating position of the range switching valve, comprising a power transmission channel between the actuator and the range switching valve. In a control device for a range switching valve in an automatic transmission in which a predetermined play amount is provided and the range switching valve is fixed and positioned at a plurality of range positions by a detent mechanism,
The switching valve position detecting means outputs a linear sensor such as a potentiometer that outputs a signal corresponding to the actual operating position of the range switching valve at least substantially continuously, and an ON / OFF signal corresponding to the actual operating position of the range switching valve. Setting means for setting a reference operation position for stopping the actuator in association with an output of the contact switch type sensor based on a target range position detected by the range position sensor. Determining means for determining whether the actual operating position of the range switching valve detected by the contact switch type sensor has reached the reference operating position; time measuring means for measuring time; A drive command in the direction where the position becomes the reference operation position is given, and the actual operation position is Control means for giving a drive command in the same direction or in the opposite direction to the direction for a predetermined time to the actuator based on the timing result of the timing means, and thereafter giving a stop command to the actuator, Means for learning a difference between the output value of the linear sensor at the operating position and the output value of the linear sensor when the range switching valve is stopped at the target range position by the action of the detent mechanism; and the predetermined time based on the difference. The above problem is solved by providing a predetermined time setting means for setting.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the reference operating position setting means sets the reference operating position to the switching valve position corresponding to a range position before the target range position. The control means gives a drive command to the actuator in a direction in which the actual operation position becomes the reference operation position, and the actual operation position is set to the reference operation position by the judgment means. After it is determined that has reached, by continuously giving a drive command in the same direction as the direction for a predetermined time to the actuator based on the timing result of the timing means,
The present invention has solved the above problem.

According to a seventh aspect of the present invention, in the fifth aspect of the invention, the reference operating position setting means relates the reference operating position to an output of the switching valve position detecting means corresponding to a target range position. The control means gives a drive command to the actuator in a direction in which the actual operation position becomes the reference operation position, and the judgment means judges that the actual operation position has reached the reference operation position. Then, a stop command is given to the actuator, and thereafter, a drive command in the direction opposite to the direction is given to the actuator for a predetermined time based on the result of the timing by the timing means, thereby solving the above-mentioned problem.

[0014]

According to the first aspect of the present invention, after it is determined that the actual operating position of the range switching valve has reached the reference operating position via the contact switch type switching valve position sensor by driving the actuator, the actuator is actuated for a predetermined time. Is driven and stopped. In other words, after passing through the reference operation position, the actuator is controlled based on the timing result of the timing means, so by setting the operation time of the actuator according to the degree of coasting of the actuator and the range switching valve, Although the system is a simple system using a contact switch type sensor, the position of the range switching valve can be accurately controlled . In addition, the operating speed of the actuator may vary
(Temperature, battery voltage, load, etc.)
The operating speed of the actuator beforehand
It is calculated based on the output of the location sensor. And that
Actuator after detecting the reference operation position according to the operation speed
The operation time (predetermined time) is set.

Further, in the invention of claim 2, the reference operation position in claim 1 is set to a range position before the target, and the time when the actual operation position of the range switching valve reaches the reference operation position is defined as a starting point. Then, the actuator is driven and stopped for a predetermined time. In this case, if the operation time of the actuator after passing the reference operation position is set in consideration of the coasting amount, the position of the range switching valve can be accurately controlled.

According to the third aspect of the present invention, the reference operating position in the first aspect is set to the target range position itself, and the actuator is temporarily stopped when the actual operating position of the range switching valve reaches the reference operating position. Can be Then, after that, the actuator is driven and stopped in the opposite direction for a predetermined time. In this case, if the operation time of the actuator is set so as to return from the appropriate range position by the amount of the overshoot, the position of the range switching valve can be accurately controlled.

[0017]

According to the fourth aspect of the present invention, when a range switching valve position sensor combined with a linear sensor is provided, when the operating position of the range switching valve enters the target range position by the action of the detent mechanism, the linear switching valve is moved to the target range position. Utilizing the fact that the output of the sensor temporarily stops, the amount of overshoot is grasped more accurately.

More specifically, when the operating position of the range switching valve reaches the recognition range of the target range position by driving the actuator, the play of the power transmission path between the actuator and the range switching valve is activated by the action of the detent mechanism. The range switching valve is self-propelled in the range of the amount, and the range switching valve moves rapidly. After self-running, the range switching valve hardly operates until the play amount is reduced again.
In other words, even if the actuator is moving (in this case, it is driven and moving and in some cases it is moving by inertia) only for a certain time after the self-propelling (the time until the amount of play is reduced), And the range switching valve is in a stopped state. The position at this time is an appropriate target range position, and is hereinafter also referred to as a “detent position”. Thereafter, when the actuator further moves due to inertial force or the like, the above-mentioned play amount is reduced, and the range switching valve starts moving again. This state is an overshoot state where the target range position has been excessively exceeded.

By the way, it is very difficult to stop the range switching valve at the above-mentioned detent position just by operating the actuator once, for a drive system which moves with a large inertial force. Then, in the invention of claim 5,
The range switching valve is stopped at a position once passing the target range position, and the actuator is reversed from that position to return the position of the range switching valve to a position where the detent mechanism stops with a click (detent position).

That is, according to the fourth aspect of the present invention, when the actual operating position of the range switching valve reaches the reference operating position (the detection value of the switching valve position detecting means is changed to the reference operating state (a state where a remarkable change is recognized, For example, at the time when the position becomes a position where the self-propelled state is reached), the range switching valve is once operated to a position slightly beyond the target range position by stopping the actuator.

Next, the range switching valve stopped at the excessive position is returned to the detent position (target range position) by driving the actuator in the reverse direction. In this case, the amount of overshoot is determined by the output value of the linear sensor immediately before driving the actuator in the reverse direction (the detent position, that is, the output value corresponding to the position where the target range position has been stopped too far) and the detent position. A "predetermined time" is set so as to detect the difference from the output value of the linear sensor (output value corresponding to the detent position) when the switching valve is momentarily stopped, and to return the range switching valve by this overshoot amount based on this difference. Is set, and the actuator is driven in the reverse direction for that time. The range switching valve in the overshoot state moves immediately following the movement of the actuator when the actuator is reversed. Then, the range switching valve returns to the detent position which is the target range position by the movement of the actuator.

According to the fifth aspect of the present invention, the correspondence between the output of the linear sensor and the output of the contact switch type sensor is learned by the learning means to prepare for the failure of the linear sensor. Specifically, an interval (position difference) between a reference operation position and a detent position when the actuator is controlled based on an output of a contact switch type sensor is converted into an output value of a linear sensor in advance and recognized.

That is, the position of the "reference operation position" is confirmed with reference to the detent position. Normally, the relationship between the ON / OFF position of the contact switch type sensor and the output of the linear sensor is different for each automobile, but by performing this learning, the difference is confirmed. Next, based on the interval (difference) between the reference operation position and the detent position converted as the output value of the linear sensor, the operation time (predetermined time) of the actuator when controlling the actuator using the reference operation position is set. .

Usually, the actuator is controlled on the basis of the output of the linear sensor capable of finely knowing the position of the range switching valve (the control method in this case is not limited), but when the linear sensor fails, The actuator is controlled based on the output of the contact switch type sensor. That is, after the actual operation position of the range switching valve reaches the reference operation position, the actuator is driven and stopped for a predetermined time set in advance. Thus, the position of the range switching valve can be accurately controlled only by the output of the contact switch type sensor without depending on the output of the linear sensor. It is a well-known fact that the probability of a contact switch sensor failing is generally lower than the failure of a linear sensor.

[0026] Further, the invention of claim 6, in which the claim 2 for claim 1 was performed for the limited to the same effect to claim 5, the reference operating position, is set in front of the range position of the target Starting from the time when the actual operation position of the range switching valve reaches the reference operation position, the actuator is driven and stopped for a predetermined time set thereafter. In this case, since the operation time of the actuator after passing the reference operation position is set based on the learning value of the linear sensor, a range comparable to the case where the actuator is controlled using the output of the linear sensor is used. Control of the switching valve can be performed.

[0027] Further, the invention of claim 7, in which the claim 3 according to aspect 1 was performed for the limited to the same effect to claim 5, the reference operating position are set in the range position itself of the target, the When the actual operating position of the range switching valve reaches the reference operating position, the actuator is stopped. Then, thereafter, the actuator is driven and stopped in the opposite direction to that of the actuator for a predetermined time set in advance. Also in this case, since the operation time in the reverse direction of the actuator after being stopped is set based on the learning value of the linear sensor, it is inferior to the case where the actuator is controlled using the output of the linear sensor. The control of the range switching valve without the pressure can be performed.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

Each of the embodiments described below has a feature in the manner of controlling the range switching valve, and the mechanical configuration is partially excluded (except for the type of switching valve position sensor described later). It is common to almost all. Therefore, for convenience of explanation, first, a mechanical configuration common to each embodiment will be described, and then the control contents of each embodiment will be individually described.

[Mechanical Structure Common to Each Embodiment] FIG. 5 shows an electric control system for driving the range switching valve of the automatic transmission, and FIG. 6 shows an outline of the range switching valve and its driving system.

First, the driving system will be described with reference to FIG. The range switching valve 30 is of a spool valve type,
The range switching valve 30 is supplied with a line hydraulic pressure, which is a basic hydraulic pressure for controlling the automatic transmission. The range switching valve 30 switches the port by operating the spool 30a in the axial direction, and controls engagement and release of a friction engagement device (not shown) for setting each shift range.

The range switching valve 30 is driven by a DC motor (actuator) 50. A control shaft 32 connects the motor 50 and the range switching valve 30.
6 is fixed. The worm wheel 56 is provided with a worm 5 provided on the drive shaft 52 of the motor 50.
4 are engaged. Therefore, the rotational driving force of the motor 50 is transmitted to the control shaft 32 at a reduced speed due to the engagement between the worm 54 and the worm wheel 56.

The rotation of the control shaft 32 is performed through the rotation of a detent lever 36 fixed on the shaft.
It is transmitted as a force for moving the spool 30a of the range switching valve 30 in the axial direction. The worm wheel 56
In the vicinity of the switching valve position sensor (switching valve position detecting means) such as a variable resistor or a contact switch capable of detecting the rotational position of the worm wheel 56, that is, the switching position (operating position) of the range switching valve 30. 22
Is arranged.

The detent lever 36 has a fan shape, and a plurality of uneven portions 36a are formed on the outer periphery thereof. A roller 38 provided at an end of a detent spring 38 is provided for one of the concave and convex portions 36a.
a is engaged. Thus, a detent mechanism 34 for determining the rotational position of the control shaft 32, that is, the plurality of range switching positions of the range switching valve 30 is configured.

FIG. 7 shows an enlarged view of the engagement between the end of the control shaft 32 and the boss 58 of the worm wheel 56. As is apparent from this figure, the end of the control shaft 32 is formed in a rectangular cross section, and this portion is inserted into the boss 58. The engaging portion is provided with a predetermined play amount δ with respect to the direction of rotation transmission therebetween. That is, this play amount δ is provided in a power transmission path between the motor 50 and the range switching valve 30, and the rotational force of the worm wheel 56 accompanying the driving of the motor 50 reduces the play amount δ. It will be transmitted to the control shaft 32 later.

By the rotation of the control shaft 32, the range switching valve 30 is switched through the detent lever 36 as described above. At this time, in each range position of the range switching valve 30, the operation of the roller 38a of the detent spring 38 repeating the operation of climbing over one convex portion of the concave / convex portion 36a of the detent lever 36 and engaging with the adjacent concave portion is repeated.

Therefore, the roller 38a is moved to the uneven portion 36a.
During a period from one convex portion to a concave portion, the control shaft 32 is controlled by the control shaft 32 based on the elastic force of the detent spring 38 irrespective of the driving of the motor 50.
The vehicle runs within the range of the play amount δ. Immediately after the self-propelled operation, until the play amount δ is reduced again by the rotation of the worm wheel 56 driven by the motor 50, the rotation amount of the control shaft 32, that is, the operation amount of the range switching valve 30 is almost zero. It does not change.

The position at which the range switching valve 30 is stopped by the operation of the detent mechanism 34 is referred to herein as a "detent position".

Next, the structure of the electric control system is shown in FIGS.
This will be described with reference to FIG. In FIG. 5, a range selection switch (corresponding to a range position sensor) 10 is
When the driver operates a lever (operating means) to select a shift range of the automatic transmission AT, a signal corresponding to a target range position is output, which is switched in accordance with the operated position. As the range selection switch 10, a switch directly operated by a driver may be used.

In FIG. 5, the range control unit 20 (S
A microcomputer is used for the BW control unit). This microcomputer is a read-only memory (ROM) storing programs necessary for various software processes for switching the shift range of the automatic transmission AT, and executes the programs. And a writable memory (RAM) capable of temporarily storing variables and the like necessary for the program.

The range control unit 20 receives a signal a from the range selection switch 10 and a signal b from a switching valve position sensor 22 for detecting the operating position of a range switching valve 30 provided on the automatic transmission AT. Entered together.
Further, a drive signal c corresponding to a signal from the range selection switch 10 is output from the range control unit 20 to a drive circuit of the motor 50.

Next, the switching valve position sensor 22 for detecting the operating position of the range switching valve 30 will be described.

As the switching valve position sensor 22, a contact switch type sensor or a linear sensor, or both of them as necessary are used. The contact switch type sensor is ON / OF according to the range position of the range switching valve 30.
It outputs the F signal. The linear sensor outputs a signal corresponding to the actual operating position of the range switching valve 30 almost continuously, and is composed of a rotary potentiometer or the like.

FIG. 8 shows an example of the structure of a contact switch type sensor.

This contact switch type sensor uses a neutral start switch (contact switch), and includes a substrate 42 provided with a plurality of contact holes on its surface,
A switching lever 44 fixed on the control shaft 32 for transmitting power to the spool of the range switching valve 30 is provided. The switching lever 44 has a conductor 45 that comes into contact with each of the contact points I to I. Therefore, when the switching lever 44 rotates along the surface of the substrate 42 by the rotation of the control shaft 32, the contact points I to I are selectively connected by the conductor 45.

FIG. 9 shows the state of connection of the contacts 1 to 4 according to the turning position of the switching lever 44, that is, the range position of the range switching valve 30. As is apparent from this drawing, in the parking (P) range, the contact A and the contact B and the contact C and the contact D are in a connected state, respectively, and the neutral (N)
In the range, the contact A and the contact B and the contact C and the contact are in a connected state, respectively. In the other reverse (R) range, drive (D) range, second (2) range, and low (L) range, only the contact C and one of the contact holes are connected. Is not connected.

As described above, the contacts I to I are selectively connected in accordance with the rotational position of the control shaft 32, and are turned on when connected.
Outputs an OFF signal when not connected. Hereinafter, a set of the contact C and the contacts D to R corresponding to each range is simply referred to as a “contact switch (SW) of a certain range”.

On the other hand, a rotary potentiometer used as a linear sensor detects the rotation angle of the control shaft 32 as a voltage change. Since the detection signal output from the linear sensor is an analog signal, it is converted into a digital signal by the A / D converter 24 shown in FIG.

In this case, the detection voltage of the potentiometer when the shift range is switched is set so as to increase in the order of L range → 2 range → D range → N range → R range → P range.

As described above, at each range position, when the range switching valve 30 self-runs within the range of the play amount δ by the function of the detent mechanism 34, the position sensor 2
2 instantaneously greatly changes. After this self-propelled,
Until the time when the play amount δ is reduced again based on the driving of the motor 50, the voltage value of the position sensor 22 hardly changes and becomes flat.

Next, the control contents of each embodiment will be described individually.

[First Embodiment] See FIGS. 10 and 11. The first embodiment is an embodiment of the first and second aspects of the present invention, and uses at least a contact switch type sensor as the switching valve position sensor 22. Further, the range control unit 20 has the following functions (1) to (4).

As shown in FIG. 10, of the output signals of the contact switch type sensor, the range before the target range position specified by the range selection switch 10 (X range)
A function for setting a point at which a signal of a contact switch corresponding to a position changes from ON to OFF as a reference operation position for stop control of the motor 50.

According to the output of the contact switch type sensor,
The function to judge whether the range switching valve has reached the reference operation position set in. That is, a function of determining whether the signal of the contact switch in the range before the target has changed from ON to OFF.

A function of measuring an elapsed time after the above judgment is made (after reaching the reference operation position).

As shown in FIG. 10, a drive command is given to the motor 50 so that the actual operating position of the range switching valve 30 becomes the target range position. To the motor 50 for a predetermined time T _0.
Function to give a stop command to

Next, the control flow of the range switching valve in this embodiment will be described with reference to the flowchart of FIG.

When this control starts, step S1 is executed.
At 01, it is determined whether or not the motor control is being performed. If the motor control is not being performed, the flag FR =
0, the flag FX = 0, and the timer is turned off.

Here, the flag FR is set to “X before the target”.
A flag indicating that the contact switch of the range has been turned from ON to OFF and the timer has been started. " The flag FX is a flag indicating that "the motor is being controlled and the contact switch of the X range immediately before the target is once turned on".

If the motor is being controlled, step S101
Then, the process proceeds to step S103, and it is determined whether the flag FR = 1. Initially, the flag FR is not 1, so the process proceeds to step S104. Then, it is determined whether or not the range position detected by the switching valve position sensor is the X range before the target.

If the X range has not been reached, step S
Proceeding to 105, it is determined whether the flag FX = 1. If the flag FX is not 1, the process proceeds to EXIT and exits from this control flow.

On the other hand, if the X range has been reached, the process proceeds from step S104 to step S106, where a flag F indicating that the contact switch of the X range is ON is set.
Set X = 1 and proceed to EXIT. From the next time, while the contact switch of the X range is ON, Step S104 → S10
Continue with 6.

Then, the X-range contact switch is turned off.
, The process proceeds from step S104 to step S105. At this point, since the flag FX = 1, the determination in step S105 is YES. If the determination in step S105 is YES, it means that the signal of the X-range contact switch shown in FIG. 10 has been changed from ON to OFF. That is, it means that the range switching valve 30 has reached the reference operation position. In this case, the process proceeds to step S108, the timer is started, and the flag FR indicating that the timer has been started is set to "1".

From the next time, since the flag FR = 1,
The determination in step S103 is YES, and step S1
Go to 09. In step S109, the count time of the timer is determined whether it is ₀ or greater than the predetermined time T, the process proceeds directly to EXIT the you become a predetermined time, the routine proceeds to step S110 When turned a predetermined time, the motor 50
A stop command is issued to end the motor control, proceed to EXIT, and exit from this control flow.

Next, the contents of the control will be described as a series of flows. When the motor 50 is driven, the operating position of the range switching valve 30 reaches the range position (X) before the target, and the contact switch of that range position Is turned on, the process proceeds in steps S101 → S103 → S104 → S106, and a flag FX indicating that the flag is turned on is set to 1. From this state, the range switching valve further moves, and the signal of the contact switch at the X range position before the target changes from ON to O.
When it becomes FF, step S104 → S105 → S108
The process proceeds, and a timer for measuring the predetermined time T0 is started. And the signal of the contact switch of X range is ON
→ from getting to OFF, where the drive to continue the motor for a predetermined period of time T _0, the predetermined time T ₀ has elapsed, the motor 5
Stop 0.

That is, after passing through the reference operation position, the motor 50 is driven based on the result of the time measurement by the time measurement means. Therefore, the operation time T _{0 of the} motor 50 depends on the degree of coasting of the motor 50 and the range switching valve 30. Is set, the position of the range switching valve 30 can be accurately controlled.

[Second Embodiment] See FIGS. 12 and 13. The second embodiment is an embodiment of the first and third aspects of the present invention, and uses at least a contact switch type sensor as the switching valve position sensor 22. Further, the range control unit 20 has the following functions (1) to (4).

As shown in FIG. 12, among the output signals of the contact switch type sensor, the signal of the contact switch corresponding to the target range position (here, the Y range position) specified by the range selection switch 10 changes from OFF to ON. A function of setting a certain point as a reference operation position for stop control of the motor 50.

A function for determining whether or not the actual output of the contact switch type sensor has reached the reference operation position set in the above. That is, a function of determining whether the signal of the contact switch of the target range among the contact switch type sensors has changed from OFF to ON.

A function for measuring the time after the above judgment is made (after reaching the reference operation position).

As shown in FIG. 12, a drive command is given to the motor 50 in the direction in which the actual operating position of the range switching valve 30 becomes the target range position, and when it is determined that a stop command is given to the motor 50, Thereafter, based on the result of the time measurement, the motor 50 is rotated in reverse after a lapse of T ₁ , and a stop command is issued to the motor 50 when a predetermined time T _{0 has} elapsed from the start of the reverse rotation.

Next, the control flow of the range switching valve in this embodiment will be described with reference to the flowchart of FIG.

Here, the target range is assumed to be "Y range". Further, T ₁ is the "stop the motor 50 by the contact switch of the target Y range is turned ON, the time until the start of reverse rotation of the motor 50 '. This time T ₁ is set to a value substantially equal to the time from when a stop command is issued to the motor 50 until the motor is actually stopped. T ₀ is “time from the start of reverse rotation of the motor 50 to the stop of the motor 50 (end of motor control)”.
It is. Further, FY is "flag indicating that in motor control, a temporarily stopped at Y range position in T within _one hour."

When this control starts, step S2
At 01, it is determined whether or not the motor control is being performed. If motor control is not being performed, the flag FY =
Set to 0, turn off the timer, and proceed to EXIT.

If the motor is being controlled, step S201
Then, the process proceeds to step S203 to determine whether or not the range position detected by the switching valve position sensor 22 is the target Y range. Whether or not the Y range has been reached is determined based on whether or not the contact switch of the Y range has been turned ON. If it has not reached the Y range, proceed to EXIT and exit from this control flow.

If the Y range has been reached, step S204
To determine whether or not the flag FY = 1. In the first process after reaching the Y range, the flag FY is not 1, so the process proceeds to step S205, the timer is started, the motor 50 is temporarily stopped, and the flag FY is set to 1. Therefore, as apparent from FIG. 12, when the Y-range contact switch is turned from OFF to ON, the timer is started and the motor 50 is stopped.

In the next process, since the flag FY = 1, the process proceeds from step S204 to step S206,
The count value of the timer to determine whether above T _1. Among from the timer start has not yet passed T ₁ times, the process proceeds to step S207, leave it to stop the motor 50. Actually, the time T ₁ is set to a time at which the motor 50 will surely stop after a stop command is issued to the motor 50. Therefore, the motor 50 stops after the time T ₁ elapses. ing.

Then, after the elapse of T ₁ time, step S
Proceeding to 208, it is determined whether the timer count value is equal to or less than T ₁ + T ₀ . At the time when T ₁ hour has passed, step S
Since the determination at 208 is YES, the process proceeds to step S209, and the motor 50 is driven in a direction opposite to the above direction.

Unless the time T ₁ + T ₀ has elapsed from the start of the timer, steps S204 → S206 → S208
→ The process proceeds in the order of S209, and the reverse rotation of the motor 50 is continued. Then, after a lapse of T ₁ + T ₀ time from the start of the timer, that is, after a lapse of T ₀ time from the start of reverse rotation of the motor 50, the process proceeds to step S 210, a stop command of the motor 50 is issued, and the motor control is terminated. Proceed to EXIT and exit from this control flow.

A description will be given as a series of flows.
Is driven, the operating position of the range switching valve 30 reaches the target range position (Y), and when the contact switch at that range position is turned from OFF to ON, steps S203 to S are performed.
The process proceeds from S204 to S205, the timer is started, the motor 50 is temporarily stopped, and the flag FY indicating that the Y-range position has been reached is set to "1".

Then, the range switching valve 30 actually stops at a position where the range switching valve 30 overshoots from an appropriate target range position due to coasting of the drive system. Wait time T ₁ that would reliably motor stops the generation of the stop command of the motor 50 has elapsed, when the time T ₁ has elapsed, the step S204
The process proceeds in the order of → S206 → S208 → S209, and the reverse rotation of the motor 50 starts. Then, after performing the reverse rotation driving for the time T ₀ , the motor 50 is stopped, and the motor control is terminated.

That is, the time when the ON signal of the contact switch at the target range position is detected (the time when the reference operation position is reached).
Then, a stop command is once issued to the motor 50, and thereafter, the motor is reversely rotated for a predetermined time in order to return the position of the range switching valve by the amount of overshoot. In this example,
By setting the predetermined time T ₀ so as to return the overshoot, the position of the range switching valve 30 can be accurately controlled.

[Third Embodiment] See FIGS. 14 to 18. The third embodiment is an embodiment of the first to third aspects of the present invention.

As shown in FIG. 15, the DC motor 50 reaches a certain speed in a short time, but its speed changes depending on conditions such as temperature, battery voltage, and load. In FIG. 15, the motor speed changes as indicated by a solid line under a certain condition, but changes as indicated by a dotted line under another condition, resulting in a difference in the motor speed. Therefore, it is not possible to cope with an actual change in the motor speed only by setting the operation time T ₀ of the motor 50 to a fixed time as described above.

[0085] Therefore, in this third embodiment, it detects the motor speed, by setting the operation time T ₀ of the motor according to the motor speed, so that respond to changes in speed. Here, the motor speed is, for example, as shown in FIG. 14, the rotation angle between the contact switches in a certain range (here, the rotation angle θ _RN between the contact switches in the N range and the R range is shown as an example), The angle is calculated from the time during which the control shaft 32 rotates.

Specifically, as shown in FIG. 16, for example, the signal of the contact switch in the range (X) just before the target is turned on.
→ from been turned OFF, the signal of the contact switch of the target range (Y) measures the time T ₂ of the until OFF → ON. Since the angle θ _YX from the end of the X-range contact to the end of the Y-range contact is constant, the operating speed of the motor 50 can be determined by dividing θ _YX by T ₂ . The operation time T of the motor 50 is determined according to the operation speed of the motor 50.
Decide ₀ .

The third embodiment is characterized in that the operation time of the motor 50 is determined. A contact switch type sensor is used as at least the switching valve position sensor 22. Further, the range control unit 20 has a function of calculating the operation speed of the motor 50 based on the output of the contact switch type sensor and a function of setting the operation time T0 of the motor 50 based on the operation speed. The control flow of the motor 50 is the same as that of the first embodiment shown in FIG. 11 or the second embodiment shown in FIG. The example of FIG. 16 shows the contents according to the second embodiment.

Next, a processing flow for determining the operation time T ₀ of the motor 50, which is a feature of the third embodiment, will be described with reference to the flowchart of FIG.
However, this control flow complies with the contents of FIG.

When this control starts, step S3
At 01, it is determined whether or not the motor control is being performed. If the motor control is not being performed, the flag FR2 is set in step S302.
= 0, proceed to EXIT, and exit this control flow. Here, the flag FR2 is a "flag indicating that the contact switch of the target Y range is ON".

If the motor is being controlled, step S301
Then, the process proceeds to step S303, where it is determined whether or not the range position detected by the switching valve position sensor 22 is the range X before the target. This determination is made based on the signal of the contact switch in the range (X) before the target. If the detection range position has reached the X range, this step S30
The determination at Step 3 becomes YES, the process proceeds to Step S304, the flag FR0 is set to 1, and the process proceeds to Step S302.
The flag FR0 is a "flag indicating that the contact switch of the X range before the target is ON".

When the signal of the X-range contact switch changes from ON to OFF, the determination in step S303 is NO.
Then, the process proceeds to step S305, where the flag FR
It is determined whether 0 = 1. X range contact switch is O
When N → OFF, the flag FR0 = 1, so the determination in step S305 is YES, the process proceeds to step S306, the timer is started, and the flag F
It is assumed that R0 = 0. Next, in step S307, the flag FR2 is set to 0, and the process proceeds to EXIT.

From the next time, since the flag FR0 = 0,
If the determination in step S305 is NO, step S30
Proceed to 8. In this step S308, it is determined whether or not the range position detected by the switching valve position sensor has reached the target Y range. That is, it is determined whether or not the signal of the contact switch in the Y range is ON. If it has not reached the Y range, the process proceeds to step S302. If it has reached the Y range, the determination in step S308 is YES, and the flow advances to step S309 to determine whether or not the flag FR2 = 0.

[0093] Since first time through this step S309 is a flag FR2 = 0, is determined in this step S309 is YES, and the process proceeds to step S310, the place where the count value of the current timer and T _2. This time T
Reference numeral ₂ denotes a time required from the time when the contact switch in the X range is turned ON to OFF to the time when the contact switch in the Y range is turned OFF. Then, the flag FR2 is set to 1 and the time T
₂ and the rotation angle θ _YX between the contacts, which is known in advance, to calculate the motor speed θ _YX / T ₂ , and based on the motor speed, the following equation T ₀ = (T ₂ / θ _YX ) × K (where , K are coefficients), and the operating time T ₀ of the motor 50 is calculated and learned.
Further, the timer off using here to measure the time T _2, then the process proceeds to EXIT, exits the control flow.

The time T learned in this control flow
_The range switching valve 30 is controlled by executing the control flow shown in FIG. 13 using ₀ .

According to the third embodiment, the motor 50
Since the operation speed of the motor 50 is detected and the operation time of the motor 50 is determined according to the detected speed, the position of the range switching valve can be controlled with higher accuracy.

In the above description, since the learning control is performed in accordance with the control flow of the second embodiment shown in FIG. Although the case of detection is shown, the motor 50
Is performed by the control flow of the first embodiment shown in FIG. 11, for example, as shown in FIG. 18, the motor speed between the contact switches in the range two before the target and the range just before the target is set as shown in FIG. Detection, and time T according to the detection speed.
You may decide ₀ .

In the example of FIG. 18, the R range is turned from ON to OFF.
By measuring the time T ₂ of the up to N range OFF → ON calculate the motor speed from, based on this, the N range O
Motor 5 after passing N → OFF point (reference operating position)
0 operation time T ₀ is determined. In this case, the target range is the D range.

[Fourth Embodiment] See FIGS. 19 and 20. This fourth embodiment is an embodiment of the fifth aspect of the present invention, and uses at least a linear sensor (here, a potentiometer) as the switching valve position sensor 22. When the output of this potentiometer shifts from the R range to the N range, for example, it becomes as shown in FIG.

As described above, when the range switch valve 30 is moved by driving the motor 50 and reaches the vicinity of the appropriate range position, the operation of the detent mechanism 34 causes the range switch valve 30 to reduce the play amount of the drive system. Self-propelled in the range, the output value of the potentiometer changes rapidly. After self-running, the range switching valve 30 hardly operates until the play amount is reduced again. At this time, the range switching valve is at the detent position.

When the detent position is the target range position, a stop command is issued to the motor 50 at the stage when the self-propelled state is detected. Then, the motor 50 further moves due to inertia force and the like, and the play amount described above is reduced, and the range switching valve 30 starts to move again, and stops in an overshoot state that is slightly too far from the appropriate range position.

As a matter of fact, when a stop command is given to the motor 50 at the stage when the self-propelling is detected, the motor 50 stops in such an overshoot state. Accordingly, the motor 50 must be reversed by the amount of the overshoot to return the range switching valve 30 to the appropriate range position (detent position).

In the fourth embodiment, the degree of return is controlled by the operating time of the motor 50, and the operating time of the motor 50 is determined by the result of detecting the overshoot amount.

A specific description will be given.

In the fourth embodiment, the range control section 20 has the following functions.

As shown in FIG. 19, a function for setting a reference operating position for stopping the motor 50 based on the output of the potentiometer. Here, the reference operation position is a position where the vehicle is in a self-propelled state.

A function for judging whether or not the self-propelled state set in the above-mentioned range is obtained in the target range recognition range based on the output of the potentiometer. When the self-propelled state is entered, the potentiometer output changes abruptly. Therefore, if the amount of change (d / dt) U of the potentiometer output value per time exceeds a predetermined value α, it is determined that the vehicle is self-propelled.

A function for measuring the time after the above judgment is made (after reaching the reference operation position).

As shown in FIG. 19, a drive command is given to the motor 50 in the direction in which the actual operating position of the range switching valve 30 becomes the target range position, and when it is determined that a stop command has been given to the motor 50, Thereafter, based on the result of the time measurement, the motor 50 is rotated in reverse after a lapse of T ₁ , and a stop command is issued to the motor 50 when a predetermined time T _{0 has} elapsed from the start of the reverse rotation.

As shown in FIG. 19, the range switching valve 30 momentarily stops at the target range position (N range in the example of FIG. 19) due to the operation of the potentiometer output value and the detent mechanism 34 immediately before the reverse rotation of the motor 50 is started. Function to calculate the overshoot amount ΔUo, which is the difference from the potentiometer output value at that time.

A function for setting the operation time T ₀ from the start of reverse rotation of the motor 50 to the stop based on the overshoot amount calculated above.

Next, the control flow of the range switching valve in this embodiment will be described with reference to the flowchart of FIG.

When this control starts, step S4
At 01, it is determined whether or not the motor control is being performed. If the motor control is not being performed, the process proceeds to EXIT and exits from this control flow.

If the motor is being controlled, step S401
Then, the process proceeds to step S402 to determine whether or not the flag FR1 = 1. Here, the flag FR1 is a "flag indicating that the motor is temporarily stopped when the self-propelling is detected at a stage beyond the range before the target."

Since the flag FR1 is 0 before the detection of the self-running, the determination in step S402 is NO, and the process proceeds to step S403. In this step S403, it is determined whether or not the range switching valve 30 is in the self-running state beyond the range before the target. To determine whether or not you are in a self-propelled state,
(D / dt) It is determined whether U> α. Proceed to EXIT until the self-propelled state is detected.
Proceed to step S404. Then, the timer is started, the flag FR1 indicating that the self-running state is detected is set to "1", and the motor 50 is temporarily stopped.

[0115] In the next round of processing, since a flag FR1 = 1, becomes YES is determined in step S402, the process proceeds to step S405, it is determined whether elapsed time T ₁ from the timer start. Of that from the timer start the elapse of a period of T ₁ hour, the process proceeds to EXIT. The time T ₁ is set to a time at which the motor 50 will surely stop after a stop command is issued to the motor 50.

When the time T ₁ has elapsed, the determination in step S405 becomes YES, and the flow advances to step S406, where it is determined whether or not the flag FR0 = 0 indicating that the motor is rotating in reverse. The first time you pass here, the flag FR0 =
0, the determination result is YES, and the
The routine proceeds to 407, where the motor 50 starts reverse rotation, and the flag FR0 = 1. Further, the overshoot amount ΔUo is calculated, and based on this value, the operation time of the motor from the start of reverse rotation of the motor is calculated from the following equation: T ₀ = ΔUo × K ₁ + C (where K ₁ and C are constants) T
Calculate ₀ .

The overshoot amount in this case is obtained by subtracting the output value of the potentiometer immediately before starting the reverse rotation of the motor from the output value of the potentiometer at the detent position. Note that the potentiometer output value at the detent position can be detected as a value at the time when the change in the potentiometer output value becomes minute (flat) after self-propelled detection. Then, this time, the program proceeds to EXIT and exits from this control flow.

In the next round, since the flag FR0 = 1, the determination in step S406 is NO, and the flow advances to step S408. Here, T ₁ +
It is determined whether or not the time T _{0 has} elapsed. Since at the time of the lapse of T ₁ times the determination in step S408 is NO E
Proceed to XIT.

EXI before the time of T ₁ + T ₀ elapses
Proceed to T and continue the reverse rotation of the motor. And T
₁ + When elapsed T ₀ hours, that is, when the elapsed T ₀ hours from the motor reverse rotation start, YES is determined in step S408
The process then proceeds to step S409, where the motor 50
Is stopped, the motor control ends, and the flag FR0
= 0, flag FR1 = 0, turn off the timer, EX
Proceed to IT.

In the fourth embodiment, since the reverse rotation time of the motor 50 is determined according to the detected overshoot amount ΔUo, the range switching valve 30 can be accurately returned to the detent position.

In this embodiment, the timing when the motor 50 is temporarily stopped is set at the time of self-running detection.
When a contact switch type sensor (neutral start switch or the like) is provided as a switching valve position sensor, the motor is stopped based on a signal from the contact switch type sensor as in the second embodiment, without using self-running detection. Of course, the timing may be set. However, the detection of the overshoot amount still depends on the potentiometer output.

[Fifth Embodiment] See FIGS. 21 to 25. The fifth embodiment is an embodiment according to claims 6 to 8, in which the switching valve position sensor 22 includes at least a potentiometer which is a linear sensor, and further includes a contact switch type sensor.

In normal operation, the motor 50 is controlled based on the output of a potentiometer capable of accurately detecting the position of the range switching valve 30. However, in preparation for a potentiometer failure, the output of the potentiometer and the contact switch are used. The correspondence between the outputs of the expression sensors is learned in advance. By performing this learning, the relationship between the ON / OFF position of the contact switch type sensor and the output of the potentiometer is different for each automobile, and this difference is detected.

As a function provided for the potentiometer fail, the fifth embodiment has the following functions.

The reference operation position described in the first embodiment or the second embodiment (for example, as shown in FIG. 21 or FIG. 23, the signal of the contact switch in the range before the target is ON →
The output value of the potentiometer corresponding to the position A at which the switch is turned off, or the position B at which the signal of the contact switch of the target range is turned from OFF to ON) and when the range switching valve stops at the target range position due to the action of the detent mechanism. A function to learn the difference from the potentiometer output value (potentiometer output value at the detent position). In other words, a function of confirming in advance where the “reference operation position” is when the motor is controlled based on the output of the contact switch type sensor based on the detent position.

Based on the result learned above, the first
The operating time T of the motor described in the embodiment or the second embodiment.
Function to set ₀ .

Next, the contents of the learning process of the correspondence between the output of the potentiometer and the output of the contact switch type sensor in this embodiment will be described with reference to the flowchart of FIG. The symbols used in this flowchart will be described in advance.

X range: Any range FLXP: Flag indicating that the position of the contact end on the P range side of the X range has been measured FLXL: Indicates that the position of the contact end on the L range side of the X range has been measured Flag U _XP … Contact ON / OFF on P range side of X range
Position U _XL … Contact ON / OFF on the L range side of the X range
Position U _X … _Detent position of X range U _XPO … Difference between detent position of X range and contact ON / OFF position of P range U _XLO … Difference between detent position of X range and contact ON / OFF position of L range difference

When this control starts, step S5
At 01, it is determined whether or not the shift is through the X range. YES
In the case of, the process proceeds to step S502, and it is determined whether or not the signal of the contact switch corresponding to the X range is ON. If it is ON, the flow advances to step S503 to determine whether or not the shift is to the P range side. There are two shift directions: P range side → L range side, L range side → P range side, so the shift direction is confirmed here.

FIG. 21 shows the relationship between the potentiometer output and the signal of the contact switch when shifting from the P range to the L range, and FIG. 22 shows the potentiometer output when actually shifting from the P range through the R range to the N range. And the signal of the contact switch. Also, FIG.
3 shows the relationship between the potentiometer output and the signal of the contact switch when shifting from the L range side to the P range side.

In the case of shifting from the L range side to the P range side, the process proceeds from step S503 to step S504, where P
If the shift is from the range side to the L range side, step S5
From 03, the process proceeds to step S512.

If the shift has been made to the P range and the process has proceeded to step S504, it is determined here whether or not the flag FLXL = 0. Since FLXL = 0 at first, the determination in step S504 is YES, and the
Proceeding to 505, where the output value of the potentiometer at that point is set to U _XL , as shown in FIG. Then, the flag FLXL = 1 is set, and U _XL and the detent position U are set.
Put the difference between _X and U _XLO . As described above, the detent position in this case is a value when the output value of the potentiometer becomes flat for a moment after self-propelled by the action of the detent mechanism, and is detected in advance. Step S
After 505, proceed to EXIT to exit this control flow.

If the contact switch corresponding to the X range is no longer ON, the determination in step S502 is NO, and the flow advances to step S506. Here, is the contact switch in the X range changed from ON to OFF during the shift? Check. If the determination in step S506 is NO, step S
Proceeding to 507, the flag FLXP = 0, the flag FLXL
= 0, and proceed to EXIT. This flow is a flow after completely passing through the X range position.

The signal of the contact switch of the X range is changed from ON to O
If it is FF, the process proceeds from step S506 to step S506.
Proceeding to 508, it is checked whether the shift is to the P range side. If the shift is to the P range, the process proceeds to step S509. If the shift is to the L range, the process proceeds to step S511.

If the process has proceeded to step S509, it is determined whether or not the flag FLXP = 0 indicating that the position of the contact end on the P range side of the X range has already been measured, that is, whether or not the measurement has not yet been performed. If YES, step S5
Proceeding to 10, the potentiometer output value U at that time is set to U _XP as shown in FIG. Then, the flag FL
XP = 1, and the difference between U _XP and detent position U _X is represented by U
_Set to _XPO and proceed to EXIT.

That is, in the above flow, FIG.
As shown, when shifting from the L range to the P range,
OFF → ON position of the range contact switch (contact L level)
Potentiometer output corresponding to the
_XLLearning from ON to OFF position (P range side of contact)
Output the potentiometer output corresponding to_XPage
To learn. Also, U_XLAnd detent position U_XThe difference between
_XLOLearning as U _XPAnd detent position U_XAnd the difference
U_XPOLearn as.

Learning is similarly performed for another range Y.
By doing so, it is possible to grasp the correspondence between the ON / OFF position of the contact switch type sensor and the output of the potentiometer during the shift from the L range to the P range.

Similarly, in the case of shifting from the P range side to the L range side, the correspondence between the ON / OFF position of the contact switch type sensor and the output of the potentiometer can be grasped as shown in FIG. That is, when the process proceeds to step S503, the process proceeds from step S503 to step S503.
The process proceeds to 512, where it is determined whether the flag FLXP = 0 or not. If the determination is YES, the process proceeds to step S510.
If NO, proceed to EXIT. If the process has proceeded to step S508, the process proceeds from step S508 to step S508.
The process proceeds to 511, where it is determined whether the flag FLXL = 0 or not. If the determination is YES, the process proceeds to step S505.
If NO, proceed to EXIT. Then, U _XP , U _XL , U _XPO , and U _XLO are _similarly learned by the above processing.

Next, based on the values learned in the above processing,
FIG. 2 shows a process for obtaining the operation time T ₀ of the motor 50.
This will be described with reference to the flowchart of FIG.

Here, it is assumed that the range before the target is X, the target range is Y, and the signal of the contact switch in each range and the output of the potentiometer have the relationship shown in FIGS.

When the processing flow of FIG. 25 starts, the shift direction is confirmed in step S601. P range side →
If the shift is on the L range, the process proceeds to step S602,
If the shift is from the L range side to the P range side, step S6
Go to 05.

First, the case of shifting from the P range side to the L range side will be described with reference to FIG. In this case, the process proceeds to step S602, and the position of the starting point is confirmed. Here, the starting point is the above-described reference operation position. If the starting point is A, that is, if the starting point is the ON → OFF point of the contact switch in the range before the target, step S60
Proceeding to 3, the operation time T _{0 of the} motor is obtained from the function formula T ₀ = f (U _XL −U _Y ), and this is learned. In this case, when the potentiometer fails, the motor control shown in FIG. 11 of the first embodiment is executed using this time T ₀ .

If the starting point is B, that is, if the starting point is the OFF → ON point of the contact switch in the target range, the process proceeds to step S604, and the operation time T _{0 of the} motor is calculated by the function expression T ₀ = f (U _YP- U _Y ) and learn this. In this case, when the potentiometer has failed, this time using the T _0, executes the motor control shown in FIG. 13 of the second embodiment.

On the other hand, if the shift direction is from the L range to the P range, the flow advances to step S605 to check the position of the starting point. As shown in FIG. 23, if the starting point is A, then the process proceeds to step S606, the operation time T ₀ of the motor, calculated from the function equation _{T 0 = f (U XP -U} Y), to learn this. In this case, when the potentiometer fails, the motor control shown in FIG. 11 of the first embodiment is executed using this time T ₀ .

If the starting point is B, step S607
Then, the operation time T _{0 of the} motor is obtained from the function expression T ₀ = f (U _YL −U _Y ), and this is learned. In this case, when the potentiometer has failed, this time using the T _0, executes the motor control shown in FIG. 13 of the second embodiment.

Thereafter, the process proceeds to EXIT and exits from this flow.

As described above, by confirming the ON / OFF position of the contact switch type sensor in advance, the fail-safe of the potentiometer can be realized.

[0148]

As described above, according to the first aspect of the present invention, after the range switching valve has passed the reference operating position,
Since the actuator is controlled based on the timing result of the timing means, accurate range switching can be realized with a simple system using a contact switch type sensor as the switching valve position sensor . Also, actuator
Considering the operation speed of the actuator, the operation time of the actuator
Is set so that the operating speed of the actuator
Even if it fluctuates due to conditions such as loading,
To accurately control the position of the range switching valve without receiving
Can be.

According to the second aspect of the present invention, after the range switching valve has passed the reference operation position set at the range position before the target, the actuator is controlled based on the time measurement result of the time measurement means. As long as the operation time of the actuator after passing the reference operation position is set in consideration of the coasting amount, accurate range switching can be realized even with a simple system using a contact switch type sensor as the switching valve position sensor. be able to.

According to the third aspect of the present invention, the actuator is temporarily stopped when the range switching valve reaches the reference operating position on the target range, and then the actuator is stopped for a time based on the result of the time measurement by the time measuring means. Since the position of the range switching valve is returned to the proper range position by reversing the rotation, the switching valve can be set only by setting the operation time of the actuator so that the range switching valve is returned by the amount of overshoot from the proper position. Although the system is a simple system using a contact switch type sensor as the position sensor, accurate range switching can be realized.

[0151]

According to the fourth aspect of the present invention, the linear sensor directly detects the overshoot amount of the range switching valve from the appropriate range position, and reverses the actuator for a time corresponding to the overshoot amount. In order to correct the position shift of the range switching valve, the position of the range switching valve can be controlled more precisely.

According to the fifth aspect of the invention, normally, the position of the range switching valve can be controlled with higher accuracy by using the output of the linear sensor, and even if the linear sensor fails, the contact switch type sensor can be used. By using the output, the position of the range switching valve can be appropriately controlled.

According to the invention of claim 6 , when the linear sensor fails, the same control as in the invention of claim 2 can be performed.

Further, according to the invention of claim 7 , when the linear sensor fails, the same control as in the invention of claim 3 can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the gist of claims 1 to 3;

FIG. 2 is a block diagram showing the gist of the invention according to claims 1 to 3 ;

FIG. 3 is a block diagram showing the gist of the invention of claim 4 ;

FIG. 4 is a block diagram showing the gist of the invention of claims 5 to 7 ;

FIG. 5 is a configuration diagram showing an electric signal system of each embodiment of the present invention.

FIG. 6 is a perspective view showing an outline of a range switching valve for switching a shift range of an automatic transmission and a driving system thereof in each embodiment of the present invention.

FIG. 7 is a plan view showing an engagement portion between a control shaft and a worm wheel of the drive system.

FIG. 8 is a diagram showing a structure of a contact switch type sensor as a switching valve position sensor in each embodiment of the present invention.

FIG. 9 is a diagram showing a contact connection state for each range of the contact switch type sensor.

FIG. 10 is a time chart of a signal of a contact switch according to the first embodiment of the present invention.

FIG. 11 is a flowchart showing control contents of the first embodiment.

FIG. 12 is a time chart of a signal of a contact switch and a motor drive signal in a second embodiment of the present invention.

FIG. 13 is a flowchart showing control contents of the second embodiment.

FIG. 14 is a diagram illustrating a relationship between a contact switch and a rotation angle used for describing a third embodiment of the present invention.

FIG. 15 is a diagram showing a change in the rotation speed of a motor used for describing the third embodiment.

FIG. 16 is a time chart of a signal of a contact switch and a motor drive signal according to a third embodiment of the present invention.

FIG. 17 is a flowchart showing control contents of the third embodiment.

FIG. 18 is a time chart of a signal of a contact switch and a motor drive signal in a modification of the third embodiment.

FIG. 19 is a diagram showing a relationship between an output of a potentiometer and a motor drive signal according to a fourth embodiment of the present invention.

FIG. 20 is a flowchart showing learning processing contents of the fourth embodiment.

FIG. 21 is a diagram showing a relationship between an output of a potentiometer and a signal of a contact switch according to a fifth embodiment of the present invention.

FIG. 22 is a diagram showing a practical example of a relationship between an output of the potentiometer and a signal of a contact switch.

FIG. 23 is a diagram showing the relationship between the output of a potentiometer and the signal of a contact switch when the shift direction is changed.

FIG. 24 is a flowchart showing learning processing contents of the fifth embodiment.

FIG. 25 is a flowchart showing another learning processing content of the fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Range selection switch (range position sensor) 20 ... Range control part 22 ... Switching valve position sensor 30 ... Range switching valve 34 ... Detent mechanism 50 ... Motor (actuator) delta ... Play amount

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-194266 (JP, A) JP-A-5-99326 (JP, A) JP-A-5-106727 (JP, A) 203054 (JP, A) JP-A-63-168375 (JP, A) JP-A-62-41954 (JP, U) JP-A-57-143926 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (7)

(57) [Claims] 1. A range position sensor for detecting a target range position from an operation range selected by an operation means, an actuator for switching an operation position of a range switching valve of an automatic transmission, and detecting an actual operation position of the range switching valve. A contact switch type switching valve position sensor, comprising: a reference operating position for stopping the actuator based on a target range position detected by the range position sensor. Setting means for setting the value in association with the output of the switching valve position sensor, and determining means for determining whether the actual operating position of the range switching valve detected by the switching valve position sensor has reached the reference operating position. A time measuring means for measuring time; and the actual operating position on the actuator. A drive command in a direction to be the reference operation position is given, and after the determination means determines that the actual operation position has reached the reference operation position, the actuator is kept in the same direction as the direction for a predetermined time based on the time measurement result of the time measurement means. Direction or reverse drive command,
Then a control means for giving a stop command to the actuator, based on the output of the switching valve position sensor Actuator
Operating speed calculating means for calculating the operating speed of the eta; and the predetermined time based on the operating speed of the actuator.
A control device for a range switching valve in an automatic transmission , comprising: a predetermined time setting means for setting . 2. The control device according to claim 1, wherein the reference operation position setting means sets the reference operation position in relation to an output of a switching valve position sensor corresponding to a range position before the target range position. Means for giving a drive command to the actuator in a direction in which the actual operation position becomes the reference operation position, and after the judgment means judges that the actual operation position has reached the reference operation position, a timing result of the timing means 2. The control device for a range switching valve in an automatic transmission according to claim 1, wherein a drive command in the same direction as said direction is continuously given to the actuator for a predetermined time based on the following. 3. The reference operating position setting means sets the reference operating position in relation to an output of a switching valve position sensor corresponding to a target range position. A drive command in the direction in which the actual operation position becomes the reference operation position is given.When the judgment unit judges that the actual operation position has reached the reference operation position, a stop command is given to the actuator. 2. The control device for a range switching valve in an automatic transmission according to claim 1, wherein a drive command in a direction opposite to the direction is given to the actuator for a predetermined time based on a result of the timing. 4. An operation range selected by an operation means.
Position sensor that detects the target range position from the
And an actuator for switching the operating position of the range switching valve of the automatic transmission.
A signal corresponding to a tutor and at least an actual operating position of the range switching valve
Linear sensor such as a potentiometer that outputs
Comprising a switching valve position detecting means including a support, a power transmission through between the actuator and the range switching valve
A predetermined amount of play is provided on the road, and the range switching valve is
Automatic transmissions that are fixed and positioned at the same position
In the control device for the range switching valve, the target range detected by the range position sensor is set.
For stopping the actuator based on the position
The reference operating position is used as the output of the switching valve position detecting means.
Setting means for setting in association with each other, and a range detected by the switching valve position detecting means
Whether the actual operating position of the switching valve has reached the reference operating position
Judgment means for judging, time measuring means for measuring time, and the actual operation position of the actuator as a reference operation position
Drive command in the direction of
A When it is determined that the actual operating position reaches the reference operating position
A stop command is given to the actuator, and then the timer
The actuator for a predetermined time based on the timing result of
After giving a drive command in the direction opposite to the direction,
Control means for giving a stop command; and immediately before giving the drive command in the reverse direction to the actuator.
An output value of the linear sensor when the range switching valve is stopped,
By the action of the detent mechanism, the target range position
Output of the linear sensor when the range switching valve stops
Automatic transmission, wherein the overshoot detection means for detecting the difference between the value, and the predetermined time setting means for setting a pre-Symbol predetermined time based on the detected difference of said overshoot detection means, that the provided Control device for the range switching valve. 5. A range position sensor for detecting a target range position from the selected operation range by the operating means, and an actuator to switch the operating position of the range selector valve of the automatic transmission, the actual operating position location before Symbol range switching valve And a switching valve position detecting means for detecting a predetermined amount of play in a power transmission channel between the actuator and the range switching valve, and the range switching valve is fixed at a plurality of range positions by a detent mechanism. the control device of the range switching valve in the automatic transmission configured to be positioned, the previous SL switching valve position detecting means, at least substantially continuously
Output a signal according to the actual operating position of the range switching valve.
The linear sensor such as a tension meter and the actual
A contact switch that outputs an ON / OFF signal according to the operating position
Tsu and a switch-type sensor, further, the target lens detected by the range position sensor
For stopping the actuator based on the position
Reference operating position is related to the output of the contact switch type sensor
Setting means for attaching and setting, and range switching detected by the contact switch type sensor
It is determined whether the actual operating position of the valve has reached the reference operating position.
Determining means for interrupting, time measuring means for measuring time, and the actual operation position of the actuator as a reference operation position.
Drive command in the direction of
After it is determined that the working position has reached the reference operating position,
Predetermined time for the actuator based on the timing result of the timing means
Only to give a drive command in the same direction or the opposite direction to the above direction,
Then, control means for giving a stop command to the actuator, the output value of the linear sensor at the reference operation position and the
At the target range position, the
The output value of the linear sensor when the
A control device for a range switching valve in an automatic transmission, comprising: means for learning a difference between: and a predetermined time setting means for setting the predetermined time based on the difference . 6. The reference operating position setting means, wherein:
Move the operating position to the range position before the target range position.
Related to the output of the corresponding switching valve position detecting means.
The control means controls the actuator so that the actual operating position is
Gives a drive command in the direction in which
Judgment that the actual operating position has reached the reference operating position by means
After that, the actuator is actuated based on the timing result of the timing means.
A drive command in the same direction as the above direction for a predetermined time.
Controller of the range switching valve in automatic transmission according to claim 5, wherein one that confers more come. Setting means 7. The reference operating position is for setting the reference operating position, in relation to the output of the switching valve position detecting means for equivalent to the target range position location, said control means Gives a drive command to the actuator in the direction in which the actual operating position becomes the reference operating position, and when the determining means determines that the actual operating position has reached the reference operating position, gives a stop command to the actuator.
After, before Symbol controller of the range switching valve in the automatic transmission of the actuator to claim 5, wherein those may grant a drive command only the direction opposite the predetermined time based on counting results of the counting means.