JPH07127723A - Controller for range switch valve in automatic transmission - Google Patents

Abstract

PURPOSE:To simply and surely prevent a range switch valve from deviating from its appropriate action position due to coasting travel by stop controlling an actuator by taking coasting travel of a drive system including the actuator into consideration when the range switch valve is driven by the actuator. CONSTITUTION:Selection of respective traveling ranges of advance/retreat and respective ranges of neutral or parking in an automatic transmission AT is performed by switching of a range switch valve (manual valve). The range switch valve is driven by a motor 50. The motor 50 is stop controlled by a range control part 20, when a target range position detected from an operation range position by a range position sensor 10 and an action position of the range switch valve detected by a switch valve position sensor 22 coinside with each other. In this case, after the real action position of the range switch valve reaches a datum action position, the motor 50 is so controlled as to be driven for prescribed peviod of time and stopped according to the result of prescribed time measurement.

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 of forward and backward traveling ranges, a neutral range and a parking range is performed by switching a range switching valve (manual valve). This range switching valve has generally been switched by a manual operation of a shift lever, but an automatic transmission having a configuration in which this is electrically controlled has already been proposed.

Japanese Utility Model Publication No. 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
It is designed to give a stop command to the motor.

[0004]

By the way, even if a stop command is given to the motor, the motor does not stop immediately, but by coasting of the motor (strictly speaking, the entire drive system of the range switching valve including the motor), There are cases where the operating position of the range switching valve deviates from the proper range position and the operating hydraulic pressure cannot be properly switched.

The present invention has been made in view of such a conventional problem, and gives a stop command to a motor in consideration of a coasting amount of a drive system including the motor, thereby spooling the spool at an appropriate position. It is an object of the present invention to provide a control device for a range switching valve for an automatic transmission, which is capable of reliably positioning.

[0006]

The invention according to claim 1 is based on FIG.
As shown in the summary thereof, a range position sensor for detecting a target range position from an operation range selected by an operating means, an actuator for switching an operating position of a range switching valve of an automatic transmission, and an actual operation of the range switching valve. In a control device for a range switching valve in an automatic transmission including a contact switch type switching valve position sensor for detecting a position, for stopping the actuator based on a target range position detected by the range position sensor. Setting means for setting a reference operating position in association with the output of the switching valve position sensor, and determining whether the actual operating position of the range switching valve detected by the switching valve position sensor has reached the reference operating position. The determining means, the time measuring means for measuring time, and the actual movement of the actuator. After the drive command is given in the direction in which the position becomes the reference operation position, and the determination means determines that the actual operation position has reached the reference operation position, the actuator is driven in the direction for a predetermined time based on the time measurement result of the time measurement means. The above-described problem is solved by providing a control unit that gives a drive command in the same direction or in the opposite direction and then gives a stop command to the actuator.

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 operating position becomes the reference operating position, and the determining means causes the actual operating position to reach the reference operating position. After the determination is made, the above problem is solved by continuously giving the actuator a drive command in the same direction as the direction for a predetermined time based on the time measurement result of the time measurement means.

According to a third aspect of the invention, in the first aspect of the invention, the reference operating position setting means relates the reference operating position to the output of the switching valve position sensor corresponding to the 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 problem is solved by giving a stop command to the actuator and then giving a drive command in the opposite direction to the direction for a predetermined time to the actuator based on the time measurement result of the time measuring means.

Further, the invention of claim 4 is, in the control device for a range switching valve in an automatic transmission according to any one of claims 1 to 3, the gist of which is shown in FIG. The above problem is solved by providing operation speed calculation means for calculating the operation speed of the actuator based on the output of the position sensor and predetermined time setting means for setting the predetermined time based on the operation speed of the actuator. It was done.

Further, 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 including at least a linear sensor such as a potentiometer for substantially continuously outputting a signal according to the actual operating position of the range switching valve,
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 configured to be positioned, based on a target range position detected by the range position sensor, a reference operation position for stopping the actuator is output by the switching valve position detecting means. Setting means to be set in association with
Judging means for judging whether or not the actual operating position of the range switching valve detected by the switching valve position detecting means has reached the reference operating position, timing means for measuring time, and the actuator for the actual operating position. Gives a drive command in the direction of becoming 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 time measurement result of the time measurement 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 opposite direction to the actuator Output value and the linear sensor when the range switching valve stops at the target range position due to the action of the detent mechanism. By providing an overshoot amount detecting means for detecting a difference from the output value of the counter and a predetermined time setting means for setting the predetermined time based on the difference detected by the overshoot amount detecting means, Is the solution.

Further, the invention of claim 6 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 are provided, and a power transmission path between the actuator and the range switching valve is provided. In a control device for a range switching valve in an automatic transmission, which is provided with a predetermined amount of play, and the range switching valve is fixed / 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 which 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. And a reference switch position for stopping the actuator, based on a target range position detected by the range position sensor, and setting the reference operation position in association with the output of the contact switch sensor. A judgment means for judging whether or not the actual operating position of the range switching valve detected by the contact switch type sensor has reached the reference operating position, a clocking means for measuring time, and the actual operation for the actuator. A drive command in the direction in which the position becomes the reference operation position is given, and the actual operation position is changed to the reference operation position by the judgment means. After it is determined that the control means has given a drive command in the same direction or in the opposite direction to the actuator for a predetermined time based on the time measurement result of the time measurement means, and then a control means for giving a stop command to the actuator, and the reference. Means for learning the 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 stops at the target range position due to the action of the detent mechanism, and the predetermined time period based on the difference. The above problem is solved by providing a predetermined time setting means for setting.

According to a seventh aspect of the present invention, in the sixth 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. It is set in relation to the output of the detection means, and 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 determination means determines the actual operation position as the reference operation position. After it is determined that, the drive command in the same direction as the direction is continuously given to the actuator for a predetermined time based on the timing result of the timing means,
This is a solution to the above problem.

According to an eighth aspect of the invention, in the sixth aspect of the invention, the reference operating position setting means relates the reference operating position to the output of the switching valve position detecting means corresponding to the 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 the determining means determines that the actual operating position has reached the reference operating position. In this case, the above-mentioned problem is solved by giving a stop command to the actuator and then giving a drive command in the opposite direction to the direction for a predetermined time to the actuator based on the time measurement result of the time measuring means.

[0014]

According to the first aspect of the invention, the actuator is driven for a predetermined time after it is determined that the actual operating position of the range switching valve has reached the reference operating position through the contact switch type switching valve position sensor. Is driven and stopped. That is, 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 or range switching valve, The position of the range switching valve can be accurately controlled even though it is a simple system using a contact switch type sensor.

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

Further, in the invention of claim 3, the reference operation position in claim 1 is set to the target range position itself, and when the actual operation position of the range switching valve reaches the reference operation position, the actuator is temporarily stopped. To be Then, thereafter, the actuator is driven in the opposite direction to that for a predetermined time and stopped. In this case, the position of the range switching valve can be accurately controlled by setting the operating time of the actuator so as to return the overshoot from the proper range position.

Further, in the invention of claim 4, the operating speed of the actuator is changed in advance in view of the fact that the operating speed of the actuator varies depending on various conditions (temperature, battery voltage, load, etc.). Is calculated based on the output of the switching valve position sensor. Then, the operation time (predetermined time) of the actuator after detection of the reference operation position is set according to the operation speed.

Further, according to the invention of claim 5, when the range switching valve position sensor including the 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 sensor is operated. The output of is temporarily stopped, and the overshoot amount 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 detent mechanism acts to allow play in the power transmission path between the actuator and the range switching valve. The range switching valve is self-propelled within the range of quantity, and the range switching valve moves rapidly. After self-propelled, 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 may be driven to move or may be moving due to inertia) for a certain period of time after self-propelled (until the amount of play is blocked). (Including), the range switching valve is in a stopped state. The position at this time is an appropriate target range position, and is also referred to as “detent position” hereinafter. After that, when the actuator further moves due to inertial force or the like, the play amount described above is blocked, and the range switching valve starts to move again. This state is an overshoot state in which the target range position has been exceeded.

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

That is, according to the fifth aspect of the invention, when the actual operating position of the range switching valve reaches the reference operating position (the detected value of the switching valve position detecting means is in the reference operating state (a state in which a remarkable change is recognized, For example, when the position (including the concept of the above-described self-propelled state) is included), the actuator is stopped to once operate the range switching valve to a position slightly overshooting the target range position.

Next, the range switching valve stopped at the excessive position is returned to the detent position (target range position) side by driving the actuator in the reverse direction. In this case, this overshoot amount is set at the detent position with the output value of the linear sensor immediately before the actuator is driven in the reverse direction (the detent position, that is, the output value corresponding to the position where the target range position has been exceeded and stopped). Detected as a difference from the output value of the linear sensor (output value corresponding to the detent position) when the switching valve stops for a moment, and based on this difference, return the range switching valve by this overshoot amount for a "predetermined time". Is set, and the actuator is driven in the reverse direction for that time. When the actuator is reversely rotated, the range switching valve in the overshoot state immediately follows the movement of the actuator. 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 invention of claim 6, the learning means learns the correspondence between the output of the linear sensor and the output of the contact switch type sensor, and prepares for the failure of the linear sensor. Specifically, the interval (positional difference) between the reference operation position and the detent position when the actuator is controlled by relying on the output of the contact switch sensor is previously converted into the output value of the linear sensor and recognized.

That is, it is confirmed where the "reference operation position" is based on the detent position. Normally, there is a deviation in the relationship between the ON / OFF position of the contact switch type sensor and the output of the linear sensor for each vehicle, but the deviation is confirmed by performing this learning. Then, 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 the actuator is controlled using the reference operation position is set. .

Then, the actuator is usually controlled based on the output of the linear sensor capable of knowing the position of the range switching valve in detail (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 operating position of the range switching valve reaches the reference operating position, the actuator is driven and stopped for the predetermined time set previously. As a result, 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 contact switch type sensor generally has a lower probability of failure than the linear sensor fails.

Further, the invention of claim 7 is the same as claim 2 with respect to claim 1, but is applied to claim 6, wherein the reference operation position is set to a range position before the target. The starting point is the time point when the actual operating position of the range switching valve reaches the reference operating position, and the actuator is driven and stopped for a predetermined time thereafter. In this case, since the operating time of the actuator after passing the reference operating position is set based on the learning value of the linear sensor, the range is comparable to that when the actuator is controlled using the output of the linear sensor. The switching valve can be controlled.

Further, the invention of claim 8 is the same as claim 3 with respect to claim 1, but is applied to claim 6, wherein the reference operation position is set to the target range position itself. The actuator is temporarily stopped when the actual operating position of the range switching valve reaches the reference operating position. Then, thereafter, the actuator is driven in the opposite direction to that for a predetermined time set in advance and stopped. Also in this case, since the operation time of the actuator in the reverse direction after it is once stopped is set based on the learning value of the linear sensor, it is comparable to the case where the actuator is controlled using the output of the linear sensor. It is possible to control a range switching valve that does not exist.

[0028]

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

Each of the embodiments described below is characterized by the way of controlling the range switching valve, and the mechanical structure is partially excluded (excluding the type of the switching valve position sensor described later). It is common to almost all. Therefore, for convenience of explanation, first, the mechanical configuration common to each embodiment will be described, and then the control contents of each embodiment will be individually described.

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

First, the drive system will be described with reference to FIG. The range switching valve 30 is of a spool valve type,
A line hydraulic pressure, which is a basic hydraulic pressure for controlling the automatic transmission, is supplied to the range switching valve 30. By operating the spool 30a in the axial direction, the range switching valve 30 switches ports to control 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, and the worm wheel 5 is mounted on the control shaft 32.
6 is fixed. For the worm wheel 56, the worm 5 mounted on the drive shaft 52 of the motor 50
4 is in mesh. Therefore, the rotational driving force of the motor 50 is transmitted to the control shaft 32 after being decelerated by the engagement of the worm 54 and the worm wheel 56.

The rotation of the control shaft 32 is achieved by the rotation of the 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
A switch 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 near 22
Are arranged.

The detent lever 36 is fan-shaped and has a plurality of concave and convex portions 36a on its outer circumference. The roller 38 provided at the end of the detent spring 38 is fitted into one of the concave and convex portions 36a.
a is engaged. This constitutes a detent mechanism 34 that determines the rotational position of the control shaft 32, that is, the plurality of range switching positions of the range switching valve 30.

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

The rotation of the control shaft 32 switches the range switching valve 30 through the detent lever 36 as described above. At this time, at each range position of the range switching valve 30, the operation of the roller 38a of the detent spring 38 overcoming one convex portion of the concave and convex portion 36a of the detent lever 36 and engaging with the adjacent concave portion is repeated.

Therefore, the roller 38a is formed in the uneven portion 36a.
Of the control shaft 32 regardless of the drive of the motor 50, due to the elastic force of the detent spring 38, from the time when the control shaft 32 passes through one convex portion to the concave portion.
The vehicle is self-propelled within the range of the play amount δ. Note that the rotation amount of the control shaft 32, that is, the operation amount of the range switching valve 30 is almost constant immediately after this self-propelled operation until the play amount δ is reduced again by the rotation of the worm wheel 56 driven by the motor 50. It does not change.

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

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

Further, in FIG. 5, the range control unit 20 (S
A microcomputer is used for the BW control unit), and this microcomputer executes a read-only memory (ROM) that stores a program necessary for various software processes for switching the shift range of the automatic transmission AT. It mainly comprises a central processing unit (CPU), a writable memory (RAM) capable of temporarily storing variables necessary for a program, and the like.

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 the range switching valve 30 provided on the automatic transmission AT side. Input together.
Further, the range control unit 20 outputs a drive signal c corresponding to the signal from the range selection switch 10 to the 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 are used as required. 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 substantially continuously, and is composed of a rotary potentiometer or the like.

FIG. 8 shows an example of the structure of the 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 points on its surface,
A switching lever 44 fixed on a 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 contact point i. Therefore, when the switching lever 44 rotates along the surface of the substrate 42 due to the rotation of the control shaft 32, the contact points i to i are selectively connected by the conductor 45.

FIG. 9 shows a connection state of the contact points i to i depending on the rotational 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 point A and the contact point B, and the contact point C and the contact point D are in the connected state, and the neutral (N)
In the range, contact point a and contact point b and contact point c and contact point f are in the connected state, respectively. In the other reverse (R) range, drive (D) range, second (2) range, and low (L) range, only contact C and one of the contact holes are connected, and Is not connected to.

In this way, the contact points i to i are selectively connected according to the rotational position of the control shaft 32, and are turned on at the time of connection.
Signal, OFF signal is output when not connected. Hereinafter, the set of the contact C and the contact D 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 this linear sensor is an analog signal, it is input to the range control unit 20 after being converted into a digital signal by the A / D converter 24 shown in FIG.

In this case, the detection voltage of the potentiometer at the time of switching the shift range is set 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 is self-propelled in the range of the play amount δ by the function of the detent mechanism 34, the position sensor 2
The voltage value of 2 greatly changes instantaneously. After this self-run,
The voltage value of the position sensor 22 is almost unchanged and becomes flat until the amount of play δ is reduced again based on the driving of the motor 50.

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

[First Embodiment] ... See FIGS. 10 and 11. The first embodiment is an embodiment of the invention of claims 1 and 2, and at least a contact switch type sensor is used as the switching valve position sensor 22. The range control unit 20 also has the following functions.

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

By the output of the contact switch type sensor,
A function to determine whether the range switching valve has reached the standard operating position set in. That is, a function of determining whether or not the signal of the contact switch in the range before the target has changed from ON to OFF.

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

As shown in FIG. 10, the motor 50 is given a drive command in the direction in which the actual operating position of the range switching valve 30 becomes the target range position. Is continuously given a drive command in the same direction as the above direction for a predetermined time T ₀ , and then the motor 50
A 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 flow chart of FIG.

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

Here, the flag FR is "X in front of the target.
It indicates that the range contact switch is turned from ON to OFF and the timer has been started. " Further, the flag FX is a flag "indicating that the contact switch of the X range before the target is once turned on during motor control".

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

If the X range is not reached, step S
In step 105, it is determined whether the flag FX = 1. If the flag FX = 1 is not satisfied, the process proceeds to EXIT and the control flow is exited.

On the other hand, when the X range is reached, the process proceeds from step S104 to step S106, where the flag F indicating that the X range contact switch is ON.
Set X = 1 and proceed to EXIT. From the next time onward, while the X range contact switch is ON, steps S104 → S10
Go to 6.

Then, the X range contact switch is turned off.
If so, the process proceeds from step S104 to step S105. Since the flag FX = 1 at this point, the determination in step S105 is YES. If the determination in step S105 is YES, it means that the signal of the contact switch in the X range shown in FIG. 10 is turned on → 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 on, since the flag FR = 1,
The determination in step S103 becomes YES, and step S1
Go to 09. In step S109, it is determined whether or not the count time of the timer is equal to or longer than the predetermined time T ₀ , and if the predetermined time is not reached, the process directly proceeds to EXIT, and when the predetermined time is reached, the process proceeds to step S110 and the motor 50
A stop command is issued to end the motor control, proceed to EXIT, and exit from this control flow.

Explaining the content of the control as a series of flows, the driving position of the range switching valve 30 reaches the target range position (X) by driving the motor 50, and the contact switch at that range position is reached. When is turned on, the process proceeds from step S101 → S103 → S104 → S106, and the flag FX indicating that it is turned on is set to 1. From that state, the range selector valve moves further, and the signal from the contact switch at the X range position in front of the target changes from ON to O.
If it becomes FF, steps S104 → S105 → S108
Then, the processing advances, and a timer for measuring the predetermined time T0 is started. And the signal of the X range contact switch is turned 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 time measurement result of the time measuring means, so that 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. By setting, 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 inventions of claims 1 and 3, and at least a contact switch type sensor is used as the switching valve position sensor 22. The range control unit 20 also has the following functions.

As shown in FIG. 12, of 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) designated by the range selection switch 10 changes from OFF to ON. A function of setting the point as a reference operation position for stop control of the motor 50.

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

A function of measuring the time after the 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. After that, the motor 50 is reversely rotated after a lapse of T ₁ time, and a stop command is given to the motor 50 after a lapse of a predetermined time T ₀ from the start of the reverse rotation, based on the time measurement result.

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 the "Y range". Further, T ₁ is “the time from when the motor 50 is stopped by turning on the contact switch of the target Y range to when the reverse rotation of the motor 50 is started”. This time T ₁ is set to a value approximately equal to the time from when a stop command is issued to the motor 50 until when the motor actually stops. Further, T ₀ is “the time from the start of the reverse rotation of the motor 50 to the stop of the motor 50 (end of motor control)”
Is. Further, FY is a "flag indicating that the motor is being controlled and is once stopped at the Y range position within T ₁ time".

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

If the motor is being controlled, step S201.
From step S203, it is determined 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 is reached is determined by whether or not the Y range contact switch is turned on. If it has not reached the Y range, it proceeds to EXIT and exits from this control flow.

When the Y range is reached, step S204
Then, it is determined whether the flag FY = 1 or not. In the first process after reaching the Y range, since the flag FY = 1 is not set, the process proceeds to step S205, the timer is started, the motor 50 is temporarily stopped, and the flag FY = 1 is set. Therefore, as is apparent from FIG. 12, when the contact switch of the Y range is turned from OFF to ON, the timer is started and the motor 50 is stopped.

In the next processing, since the flag FY = 1, the process proceeds from step S204 to step S206.
It is determined whether the count value of the timer is T ₁ or more. If the time T ₁ has not elapsed from the timer start, the process proceeds to step S207 and the motor 50 is kept stopped. Actually, this T ₁ time is set to a time at which the motor 50 will surely stop after the stop command is issued to the motor 50, so the motor 50 stops at the stage when this T ₁ time has elapsed. ing.

Then, when T ₁ time has passed, step S
In step 208, it is determined whether or not the timer count value is T ₁ + T ₀ or less. When T ₁ time has passed, step S
Since the determination of 208 is YES, the process proceeds to step S209, and the motor 50 is driven in the direction opposite to the above direction.

Before the time T ₁ + T ₀ elapses from the timer start, steps S204 → S206 → S208
→ The process proceeds in the order of S209, and the reverse rotation of the motor 50 is continued. Then, after the lapse of T ₁ + T ₀ hours from starting the timer, i.e. after the lapse T ₀ hours from the start of the reverse rotation of the motor 50, the process proceeds to step S210, issues a stop command of the motor 50, and terminates the motor control, Proceed to EXIT and exit this control flow.

Explaining as a series of flow, the motor 50
When the operating position of the range switching valve 30 reaches the target range position (Y) by driving, and the contact switch at that range position is turned from OFF to ON, steps S203 to S
The process proceeds from 204 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 it overshoots from the proper target range position due to coasting of the drive system. Waiting until the time T ₁ which will stop the motor surely from the generation of the stop command of the motor 50 elapses, and when the time T ₁ elapses, step S204
→ S206 → S208 → S209, and the reverse rotation of the motor 50 starts. Then, after the reverse rotation is driven for T ₀ time, the motor 50 is stopped and the motor control is ended.

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 that the overshoot amount is returned, 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 invention of claim 4.

The DC motor 50 reaches a constant speed in a short time as shown in FIG. 15, but the speed changes depending on the conditions such as temperature, battery voltage, and load. In FIG. 15, under certain conditions, the motor speed changes as shown by the solid line, but under other conditions it changes as shown by the dotted line, resulting in a difference in motor speed. Therefore, it is not possible to deal with the actual change of the motor speed only by deciding the operation time T ₀ of the motor 50 to a constant time as described above.

Therefore, in the third embodiment, the motor speed is detected and the operating time T _{0 of the} motor is set in accordance with the motor speed, so that the change in the speed can be dealt with. Here, the motor speed is, for example, as shown in FIG. 14, the rotation angle between the contact switches of a certain range (here, the rotation angle θ _RN between the contact switches of the N range and the R range is shown as an example), and The angle is calculated from the time when the control shaft 32 rotates.

Specifically, as shown in FIG. 16, for example, the signal of the contact switch in the range (X) in front of the target is ON.
→ Measure the time T ₂ from the time of turning off to the time when the signal of the contact switch of the target range (Y) turns from off to 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 known by dividing θ _YX by T ₂ . Then, according to the operating speed of the motor 50, the operating time T of the motor 50
Decide ₀ .

The third embodiment is characterized in that the operating time of the motor 50 is determined, and a contact switch type sensor is used as at least the switching valve position sensor 22. The range controller 20 has a function of calculating the operating speed of the motor 50 based on the output of the contact switch type sensor, and a function of setting the operating time T0 of the motor 50 based on the operating 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 operating 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 is based on the contents of FIG.

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

If the motor is being controlled, step S301.
From step S303, it is determined whether or not the range position detected by the switching valve position sensor 22 is the range X in front of the target. This judgment is made by the signal of the contact switch in the range (X) in front of the target. If the detection range position has reached the X range, this step S30
When the determination result in 3 is YES, the process proceeds to step S304, the flag FR0 = 1 is set, 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".

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

From the next time onward, the flag FR0 = 0,
The determination in step S305 is NO, and step S30
Go 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 the Y range has not been reached, the process proceeds to step S302. If the Y range has been reached, the determination in step S308 is YES, the process proceeds to step S309, and it is determined whether the flag FR2 = 0.

When this step S309 is first passed, the flag FR2 = 0, so the determination in this step S309 becomes YES, the flow proceeds to step S310, where the current count value of the timer is set to T ₂ . This time T
₂ is the time taken from when the X range contact switch is turned ON to when it is turned OFF until when the Y range contact switch is turned ON. Then, the flag FR2 = 1 is set, and the time T
₂ and the known rotation angle θ _YX between the contacts, the motor speed θ _YX / T ₂ is calculated, and based on the motor speed, the following equation T ₀ = (T ₂ / θ _YX ) × K (however, , K is a coefficient), the operating time T ₀ of the motor 50 is calculated and learned.
Also, the timer used to measure the time T ₂ here is turned off, after which it proceeds to EXIT and exits this control flow.

Then, the time T learned in this control flow is
_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 is previously prepared.
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 more accurately.

In the above description, the motor speed between the contact switch in the range immediately before the target and the contact switch in the target range is related to the learning control according to the control flow of the second embodiment shown in FIG. Although the case of detection is shown, the motor 50
When the control 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 of the target front range and the target front range is set. Detected and time T according to the detection speed
You may decide ₀ .

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

[Fourth Embodiment] See FIGS. 19 and 20. The fourth embodiment is an embodiment of the invention of claim 5, and at least a linear sensor (potentiometer in this case) is used as the switching valve position sensor 22. The output of the potentiometer becomes as shown in FIG. 19 when the R range is shifted to the N range, for example.

As described above, when the motor 50 is driven and the range switching valve 30 is moved, when the proximity of the proper range position is reached, the range switching valve 30 is operated by the action of the detent mechanism 34 to reduce the play amount of the drive system. Self-propelled in the range, the output value of the potentiometer changes rapidly. After self-propelled, the range switching valve 30 hardly operates until the play amount is reduced again. At this time, the range switching valve is in 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-running is detected. Then, the motor 50 further moves due to inertial force or the like, the play amount described above is blocked, the range switching valve 30 starts to move again, and stops in an overshoot state slightly overshooting from the proper range position.

Actually, when a stop command is given to the motor 50 at the stage of detecting the free-running, the motor 50 stops in such an overshooting state. Therefore, it is necessary to reverse the motor 50 by the amount of the overshoot and return the range switching valve 30 to the proper range position (detent position) side.

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 unit 20 has the following functions 1 to.

As shown in FIG. 19, a function of setting a reference operation 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 of judging whether or not the self-running state set in the above is set in the target range recognition range by the output of the potentiometer. In the self-propelled state, the potentiometer output changes abruptly. Therefore, when the amount of change (d / dt) U of the potentiometer output value per time exceeds a predetermined value α, it is determined to be self-propelled.

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

As shown in FIG. 19, the motor 50 is given a drive command in the direction in which the actual operating position of the range switching valve 30 becomes the target range position, and when it is judged that a stop command is once given to the motor 50. After that, the motor 50 is reversely rotated after a lapse of T ₁ time, and a stop command is given to the motor 50 after a lapse of a predetermined time T ₀ from the start of the reverse rotation, based on the time measurement result.

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

A function of setting the operation time T ₀ from the start of the reverse rotation of the motor 50 to the stop thereof 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
In 01, it is determined whether or not the motor is being controlled. If the motor is not being controlled, the process proceeds to EXIT and the control flow is exited.

If the motor is being controlled, step S401.
From step S402, it is determined whether or not the flag FR1 = 1. Here, the flag FR1 is a "flag that indicates that the motor is temporarily stopped by detecting self-running at a stage beyond the target range.

Since the flag FR1 = 0 before the detection of the free-running, the determination in step S402 is NO, and the flow advances to step S403. In step S403, it is determined whether the range switching valve 30 is in the self-propelled state beyond the target range. Judgment whether or not it is self-propelled,
(D / dt) It depends on whether or not U> α. Until the self-running state is detected, the process proceeds to EXIT, and when the self-running state is detected,
It proceeds to step S404. Then, the timer is started here, the flag FR1 indicating that the self-propelled state is detected is set to "1", and the motor 50 is once stopped.

In the next processing, since the flag FR1 = 1, the determination in step S402 is YES, the flow proceeds to step S405, and it is determined whether or not T ₁ time has elapsed from the timer start. If T ₁ time has not elapsed since the timer started, the process proceeds to EXIT. This T ₁ time is set to a time at which the motor 50 will surely stop after the stop command is issued to the motor 50.

Then, after the lapse of T ₁ time, the determination in step S405 becomes YES, the flow proceeds to step S406, and it is determined here whether or not the flag FR0 = 0 indicating that the motor is in reverse rotation. When you pass here for the first time, flag FR0 =
Since it is 0, the determination result is YES and step S
In step 407, the motor 50 is started to rotate in the reverse direction, and the flag FR0 = 1 is set. Also, the overshoot amount ΔUo is calculated, and based on this value, the operating time of the motor after the reverse rotation of the motor is started from the following equation T ₀ = ΔUo × K ₁ + C (where K ₁ and C are constants) T
Calculate ₀ .

In this case, the overshoot amount is obtained by subtracting the output value of the potentiometer immediately before starting the reverse rotation of the motor and the potentiometer output value at the detent position. 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 small (flat) after the self-running detection. Then, this time, the process proceeds to EXIT and exits from this control flow.

At the next time, since the flag FR0 = 1, the judgment in step S406 becomes NO, and the flow advances to step S408. Here, from timer start to T ₁ +
It is determined whether T ₀ time has elapsed. When the time T ₁ has elapsed, the determination in step S408 is NO, so E
Go to XIT.

When the time T ₁ + T ₀ has not elapsed, EXI
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
Then, the process proceeds to step S409, where the motor 50
Stop, the motor control is terminated, and the flag FR0
= 0, flag FR1 = 0, the timer is turned off, and EX
Go 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.

Although the timing for temporarily stopping the motor 50 is set at the time of detecting the free-running in this embodiment,
When a contact switch type sensor (neutral start switch or the like) is provided as the switching valve position sensor, the motor is stopped based on the signal of the contact switch type sensor as in the second embodiment, instead of the self-running detection. Of course, the timing may be set. However, the detection of the overshoot amount depends on the potentiometer output even in that case.

[Fifth Embodiment] -See Figs. 21 to 25. The fifth embodiment is the embodiment of claims 6 to 8, and as the switching valve position sensor 22, at least a potentiometer which is a linear sensor is provided, and in addition thereto, a contact switch type sensor is also provided.

In normal times, the motor 50 is controlled based on the output of the potentiometer capable of accurately detecting the position of the range switching valve 30, but the potentiometer output and the contact switch are provided in preparation for the potentiometer failure. The correspondence relationship between the outputs of the expression sensors is learned in advance. By carrying out this learning, there is a deviation in the relationship between the ON / OFF position of the contact switch type sensor and the output of the potentiometer for each vehicle, but this deviation 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, the signal of the contact switch of the target front range as shown in FIG. 21 or 23 is turned ON →
When the range switch valve stops at the target range position due to the output value of the potentiometer corresponding to the A position where it becomes OFF, or the B position where the signal of the contact switch of the target range turns from OFF to ON), and 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, the function to check in advance where the "reference operation position" is when the motor is controlled according to the output of the contact switch type sensor with the detent position as the reference.

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

Next, the content of the learning process of the correspondence relationship 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 ... Arbitrary 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 ... ON / OFF of the contact on the P range side of the X range
Position U _XL ... Contact ON / OFF on the L range side of the X range
Position U _X ... X range detent position U _XPO ... _{Difference between} X range detent position and P range side contact ON / OFF position U _XLO ... Between X range detent position and L range side contact ON / OFF position difference

When this control starts, step S5
In 01, it is determined whether or not the shift passes 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 process proceeds to step S503 to determine whether the shift is to the P range side. Since there are two shift directions, that is, the P range side → L range side and the L range side → P range side, 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 side to the L range side. FIG. 22 shows the potentiometer output when the P range is actually shifted to the N range direction via the R range. And the signal of the contact switch are shown. Moreover, 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 flow advances from step S503 to step S504 to set P
In the case of shifting from the range side to the L range side, step S5
It progresses from 03 to step S512.

If the shift is to the P range side and the process proceeds to step S504, it is determined here whether the flag FLXL = 0. Since FLXL = 0 at the beginning, the determination in step S504 is YES, and step S504
Proceeding to 505, the output value of the potentiometer at that time 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.
The difference with _X is set as U _XLO . The detent position in this case is a value when the potentiometer output value becomes momentarily flat after self-propelled by the action of the detent mechanism as described above, and is detected in advance. Step S
After 505, proceed to EXIT and 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 process proceeds to step S506, where the contact switch for the X range is turned ON → OFF during the shift. To confirm. If the determination in step S506 is NO, then step S506
Proceeding to 507, flag FLXP = 0, flag FLXL
= 0 and proceed to EXIT. This flow is the flow after completely passing through the X range position.

The signal of the X range contact switch is turned ON → O
When it becomes FF, from step S506 to step S506
Proceed to 508, where it is confirmed whether or not the shift is to the P range side. Then, in the case of shifting to the P range side, the process proceeds to step S509, and in the case of shifting to the L range side, proceeds to step S511.

In the case of proceeding to step S509, it is judged 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 been completed yet. , YES, step S5
Proceeding to step 10, the potentiometer output value U at that time is set as U _XP as shown in FIG. Then, the flag FL
With XP = 1, the difference between U _XP and detent position U _X is U
_{Put XPO} and proceed to EXIT.

That is, in the above flow, FIG.
As is the case when shifting from the L range side to the P range side,
Range contact switch from OFF to ON position (contact L level
The potentiometer output corresponding to
_XLON → OFF position (contact P range side)
U for the potentiometer output corresponding to the end position)_XPage
To learn. Also U_XLAnd detent position U_XDifference from U
_XLOLearn as U _XPAnd detent position U_XDifference from
U_XPOTo learn as.

The same applies to the other 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 when shifting from the L range side to the P range side.

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.
In 512, it is determined whether or not the flag FLXP = 0, and if the determination is YES, the process proceeds to step S510.
If no, go to EXIT. If the process has proceeded to step S508, the process proceeds from step S508 to step S508.
In step 511, it is determined whether the flag FLXL = 0, and if the determination is YES, the process proceeds to step S505.
If no, go to EXIT. Then, through the above processing, U _XP , U _XL , U _XPO , and U _XLO are _similarly learned.

Next, according to the values learned in the above processing,
The process of obtaining the operating time T ₀ of the motor 50 is shown in
This will be described with reference to the flowchart of FIG.

Here, it is assumed that the range in front of the target is X, the target range is Y, and the signal of the contact switch and the output of the potentiometer in each range 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 side, the process proceeds to step S602,
In the case of shifting 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-mentioned reference operation position. When the starting point is A, that is, when the ON → OFF point of the contact switch in the range before the target is set as the starting point, step S60
3, the operating time T _{0 of the} motor is obtained from the functional expression T ₀ = f (U _XL −U _Y ) and learned. Then, in this case, when the potentiometer fails, this time T ₀ is used to execute the motor control shown in FIG. 11 of the first embodiment.

When the starting point is B, that is, when the OFF → ON point of the contact switch in the target range is set as the starting point, the process proceeds to step S604, and the motor operating time T ₀ is calculated by the functional expression T ₀ = f (U _YP- U _Y ) and learn this. Then, in this case, when the potentiometer fails, the motor control shown in FIG. 13 of the second embodiment is executed using this time T ₀ .

On the other hand, if the shift direction is from the L range side to the P range side, the flow advances to step S605 to check the position of the starting point. As shown in FIG. 23, when the starting point is A, the process proceeds to step S606, the operating time T _{0 of the} motor is obtained from the functional expression T ₀ = f (U _XP −U _Y ), and this is learned. Then, in this case, when the potentiometer fails, this time T ₀ is used to execute the motor control shown in FIG. 11 of the first embodiment.

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

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

In this way, 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 invention of claim 1, after the range switching valve has passed the reference operation position,
Since the actuator is controlled based on the timing result of the timing means, it is possible to realize accurate range switching even with a simple system using a contact switch type sensor as the switching valve position sensor.

Further, according to the invention of claim 2, after the range switching valve has passed the reference operation position set to the range position before the target, the actuator is controlled based on the time measurement result of the time measuring means. As long as the operating time of the actuator after passing the reference operating position is set in consideration of the coasting amount, it is a simple system that uses a contact switch type sensor as the switching valve position sensor, but realizes accurate range switching. be able to.

According to the third aspect of the 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 operated for a time based on the time measurement result of the time measuring means. By reversing, the position of the range switching valve is returned to the proper range position.Therefore, if the operating time of the actuator is set so as to return the range switching valve by the amount of overshoot from the proper position, the switching valve Although it is a simple system that uses a contact switch type sensor as a position sensor, it is possible to realize accurate range switching.

Further, according to the invention of claim 4, since the operating time of the actuator is set in consideration of the operating speed of the actuator, even when the operating speed of the actuator varies depending on conditions such as temperature and load, The position of the range switching valve can be accurately controlled without being affected by them.

Further, according to the invention of claim 5, the linear sensor directly detects the overshoot amount of the range switching valve from the proper range position, and the actuator is reversely rotated for a time corresponding to the overshoot amount. Since the position shift of the range switching valve is corrected, the position of the range switching valve can be controlled more accurately.

Further, according to the invention of claim 6, normally, the position of the range switching valve can be controlled more accurately by utilizing the output of the linear sensor, and even if the linear sensor fails, the contact switch type sensor By using the output, the position of the range switching valve can be appropriately controlled.

According to the invention of claim 7, when the linear sensor fails, the same control as that of the invention of claim 2 can be performed.

According to the invention of claim 8, when the linear sensor fails, the same control as that of the invention of claim 3 can be performed.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing the gist of the invention of claim 4;

FIG. 3 is a block diagram showing the gist of the invention of claim 5.

FIG. 4 is a block diagram showing the gist of the invention of claims 6-8.

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 its drive system in each embodiment of the present invention.

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

FIG. 8 is a diagram showing the 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 sensor.

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

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

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

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

FIG. 14 is a diagram showing a relationship between a contact switch and a rotation angle, which is used for explaining a third embodiment of the present invention.

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

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

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

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

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

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

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

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

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

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

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

[Explanation of symbols]

 10 ... Range selection switch (range position sensor) 20 ... Range control unit 22 ... Switching valve position sensor 30 ... Range switching valve 34 ... Detent mechanism 50 ... Motor (actuator) δ ... Play amount

Claims (8)

[Claims] 1. A range position sensor for detecting a target range position from an operation range selected by an operating means, an actuator for switching the operating position of a range switching valve of an automatic transmission, and an actual operating position of the range switching valve. In a control device for a range switching valve in an automatic transmission including a contact switch type switching valve position sensor, a reference operating position for stopping the actuator based on a target range position detected by the range position sensor. And a 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. , A time measuring means for measuring time, and the actual operating position on the actuator. After the drive command in the direction of the reference operation position is given and the judgment means determines that the actual operation position has reached the reference operation position, the actuator is synchronized with the direction for a predetermined time based on the time measurement result of the time measurement means. Direction or reverse drive command is given,
A control device for a range switching valve in an automatic transmission, comprising: a control unit that gives a stop command to the actuator thereafter. 2. The reference operation position setting means sets the reference operation position in relation to the output of a switching valve position sensor corresponding to a range position before the target range position, The means gives a drive command to the actuator in a direction in which the actual operating position becomes the reference operating position, and after the determining means determines that the actual operating position has reached the reference operating position, the timing result of the timing means is measured. 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 is continuously given to the actuator for a predetermined time based on the above. 3. The reference operation position setting means sets the reference operation position in relation to the output of a switching valve position sensor corresponding to a target range position, and the control means sets the actuator to the actuator. A drive command in a direction in which the actual operation position becomes the reference operation position is given, and when the judgment means judges that the actual operation position has reached the reference operation position, a stop command is given to the actuator, and then the timing means The control device for a range switching valve in an automatic transmission according to claim 1, wherein the actuator is given a drive command in a direction opposite to the direction for a predetermined time based on a result of timing. 4. A control device for a range switching valve in an automatic transmission according to claim 1, further comprising: an operating speed calculation for calculating an operating speed of an actuator based on an output of the switching valve position sensor. And a predetermined time setting means for setting the predetermined time based on the operating speed of the actuator. 5. A range position sensor for detecting a target range position from an operating range selected by an operating means, an actuator for switching the operating position of a range switching valve of an automatic transmission, and at least an actual operating position of the range switching valve. A switching valve position detecting means including a linear sensor such as a potentiometer that outputs a corresponding signal substantially continuously, and a predetermined play amount is provided in the power transmission path between the actuator and the range switching valve, and A range switching valve control device in an automatic transmission having a structure in which a range switching valve is fixed and positioned at a plurality of range positions by a detent mechanism, wherein the actuator is stopped based on a target range position detected by the range position sensor. The reference operation position for the switching valve position detection means Setting means associated with the output, determining means for determining whether or not the actual operating position of the range switching valve detected by the switching valve position detecting means has reached the reference operating position, and timing for measuring time Means for giving a drive command in a direction in which the actual operation position becomes a reference operation position to the actuator, and giving 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, After that, based on the time measurement result of the time measurement means, after giving a drive command in the opposite direction to the actuator for a predetermined time based on the time measurement result, a control means for giving a stop command to the actuator; The output value of the linear sensor when the range switching valve is stopped,
Overshoot amount detecting means for detecting a difference from 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 above-mentioned difference based on the difference detected by the overshoot amount detecting means. A control device for a range switching valve in an automatic transmission, comprising: a predetermined time setting means for setting a predetermined time. 6. A range position sensor for detecting a target range position from an operation range selected by an operating means, an actuator for switching the operating position of a range switching valve of an automatic transmission, and an actual operating position of the range switching valve. And a switching valve position detecting means for controlling the range switching valve, wherein 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 and positioned at a plurality of range positions by the detent mechanism. In the control device for the range switching valve in the automatic transmission having the structure described above, the switching valve position detecting means is a linear sensor such as a potentiometer that outputs a signal according to the actual operating position of the range switching valve at least substantially continuously, and a range. Contact switch sensor that outputs an ON / OFF signal according to the actual operating position of the switching valve Further comprising: setting means for setting a reference operation position for stopping the actuator in association with an output of the contact switch sensor based on a target range position detected by the range position sensor; Judgment means for judging whether or not the actual operating position of the range switching valve detected by the sensor has reached the reference operating position, time measuring means for measuring time, and the actuator having the actual operating position as the reference operating position. After the driving command is given in the following direction and the judgment means determines that the actual operation position has reached the reference operation position, the actuator is driven in the same direction or in the opposite direction for a predetermined time based on the time measurement result of the time measurement means. Drive command of
After that, the difference between the output value of the linear sensor at the reference operation position and the output value of the linear sensor when the range switching valve is stopped at the target range position due to the action of the detent mechanism is controlled by a control unit that gives a stop command to the actuator. A control device for a range switching valve in an automatic transmission, comprising: a learning means; and a predetermined time setting means for setting the predetermined time based on the difference. 7. The reference operating position setting means sets the reference operating position in relation to the output of the switching valve position detecting means corresponding to the range position before the target range position, The control means gives the actuator a drive command in a direction in which the actual operating position becomes the reference operating position, and after the determining means determines that the actual operating position has reached the reference operating position, 7. The control device for a range switching valve in an automatic transmission according to claim 6, wherein a drive command in the same direction as the direction is continuously given to the actuator for a predetermined time based on the result of time measurement. 8. The reference operation position setting means sets the reference operation position in relation to the output of the switching valve position detection means corresponding to a target range position, and the control means comprises: A drive command is given to the actuator in a direction in which the actual operation position becomes the reference operation position, and when the determination means determines that the actual operation position has reached the reference operation position, the actuator is given a stop command and then the timekeeping 7. The control device for a range switching valve in an automatic transmission according to claim 6, wherein the actuator is given a drive command in a direction opposite to the direction for a predetermined time based on the result of time measurement by the means.