JP2000170891A - Initializing device of speed-change control device for continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a sensor and to shorten a time required for an initialization when the initialization for coinciding a command value of a motor for operating a speed-change control valve with a rotation position of the motor. SOLUTION: A motor rotation position M.step at the time of interception of a power source is memorized and at the time of inputting of the power source, a motor limitation driving quantity (M.step+Lo.Lim.Step+α) required for operating the motor from this position M.step to a hardware limitation position at the lowest speed speed-change ratio side is determined. Here, Lo.Lim.Step is defined as the motor driving quantity from a rotation position corresponding to the lowest speed speed- change ratio to the hardware limitation position at the lowest speed speed-change ratio side and α is defined as a room. During stopping immediately after inputting of the power source, the motor is operated from the rotation position M.step at the time of interception of the power source to the hardware limitation position at the lowest speed speed-change ratio side by commanding that the motor is operated by the above (M.step+Lo.Lim.Step+α). Thereafter, the motor is return operated to the position corresponding to the lowest speed speed-change ratio and a motor command value at this time is defined as 0 corresponding to the lowest speed speed-change ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change control device such as a V-belt type continuously variable transmission or a toroidal type continuously variable transmission, and more particularly to a speed change control device in which a speed change control valve corresponds to a speed ratio command. The present invention relates to an apparatus for initializing a motor command value, which is necessary for eliminating a discrepancy between a rotational position of a motor to be stroked to a position and a motor command value.

[0002]

2. Description of the Related Art Taking a V-belt type continuously variable transmission as an example of a continuously variable transmission, a shift control device thereof has a suitable target adapted to an operation state as described in Japanese Patent Publication No. 5-78457. A gear ratio is calculated, and a motor such as a step motor or a servomotor is rotated by a gear ratio command corresponding to the gear ratio to operate the gear shift control valve to a stroke position corresponding to the target gear ratio. With this operation, the speed change control valve generates and outputs a speed change control pressure corresponding to the target speed change ratio, and the continuously variable transmission is steplessly shifted toward the target speed change ratio in response to the speed change control pressure.

Incidentally, the command value to the motor may deviate from the actual motor rotational position, and in this case, accurate shift control is difficult. For this reason, in a transmission control device of a continuously variable transmission, it is customary to perform initialization for matching a motor command value to an actual motor rotation position. During stopping at the time of turning on, the motor is rotated in one direction, the rotation of the motor is stopped by detecting that the motor rotation position has reached the reference position by a switch, and at this time the motor command value corresponds to the reference position. A method of initializing to a value has been proposed.

However, in the above-described initialization method of the shift control device, a switch for detecting that the motor rotational position has reached the reference position is indispensable, and the cost is increased, and the switch is easily broken and cannot be initialized. Because of the problem that the probability is high, the applicant of the present application first disclosed in
No. 78063 has already proposed the following initialization device which enables the motor to be brought to the reference position without using a switch as described above.

[0005] The proposed technique is to operate the motor to a hardware limit position in one direction (a limit position on the lowest speed side) while the vehicle is stopped at the time of turning on the power of the transmission controller, and then to set a reference position in the other direction. Initialize the motor to return to the position (lowest speed position), and when the initialization operation of the motor is completed, initialize the command value to the motor as the command value corresponding to the reference position (lowest speed position). The motor command value to be initialized is initialized.

[0006]

By the way, when the power of the speed change controller is turned on, the motor is normally located at the position corresponding to the lowest speed ratio, but the speedless deceleration of the continuously variable transmission reaches the lowest speed ratio due to rapid deceleration. If the vehicle stops and the ignition switch is turned off and the transmission controller is cut off from the power supply, the shift will not proceed thereafter, and the motor will remain at the position corresponding to the high-speed gear ratio. When the power of the shift controller is turned on, the motor may be located at a position corresponding to the higher speed ratio than the position corresponding to the lowest speed ratio.

Therefore, when the motor is operated to the hardware limit position on the lowest speed side when the power of the speed change controller is turned on for the initialization operation of the motor, the motor is surely secured even in the above case. In order to operate the motor at the hardware limit position on the lowest speed side, it is necessary to give a command value large enough to make the motor full stroke.
For this reason, this is usually the case in most cases.However, if the motor is in a position corresponding to the lowest speed gear ratio when the power of the transmission controller is turned on, the motor will not operate due to an excessive command value. After being operated for a while, the operation command in the same direction continues to be input for a while and stops at the limit position, it takes a long time to initialize the motor, and it takes time to initialize the motor command value. I have confirmed that it causes problems.

According to a first aspect of the present invention, a motor rotation position at the time of power-off of a transmission controller is stored,
An object of the present invention is to solve the above problem by calculating a motor limit drive amount required for operating the motor to the hardware limit position based on the command and instructing the motor to operate.

A second object of the present invention is to propose an initialization apparatus capable of suitably determining the motor limit drive amount.

A third object of the present invention is to provide an initialization apparatus which reduces a stroke required for initializing a motor, thereby realizing quick initialization.

A fourth object of the present invention is to propose a technique for initializing a motor command value that is useful when the vehicle is running immediately after power-on of a transmission controller.

According to a fifth aspect of the present invention, in the case where the vehicle is running immediately after turning on the power to the speed change controller, when the stored value of the motor rotational position when the power to the speed change controller is turned off is not valid. It is an object of the present invention to propose an initialization technique for preventing the initialization control from being illegally performed.

According to a sixth aspect of the present invention, even when the stored value of the motor rotational position when the power of the transmission controller is turned off is not valid, the vehicle is stopped immediately after the power supply of the transmission controller is turned on. It is an object of the present invention to propose an initialization technique in which initialization control is not disabled.

[0014]

SUMMARY OF THE INVENTION To achieve these objects, an initialization apparatus for a transmission control apparatus for a continuously variable transmission according to a first aspect of the present invention is configured to rotate a motor by a command value corresponding to a target transmission ratio. In the case of a continuously variable transmission in which the control valve is operated and the speed is shifted by the shift control pressure output by the shift control valve in response to the operation, when the shift controller of the continuously variable transmission is disconnected from the power supply The rotational position of the motor is stored, and when the power of the transmission controller is turned on, the motor is operated to a hardware limit position in one direction based on the stored motor rotational position when the power is turned off. The motor limit drive amount required for the motor is calculated, and during a stop immediately after the power supply of the transmission controller is turned on, the motor is commanded to operate by the motor limit drive amount from the motor rotation position at the time when the power is turned off. After operating at the hardware limit position in one direction, the operation is returned from the hardware limit position in one direction to the reference position in the other direction, and the command value to the motor at the time when the initialization operation of the motor is completed is set to the reference value. A motor command value is initialized as a command value corresponding to a position.

According to a second aspect of the present invention, in the initialization apparatus of the transmission control device for a continuously variable transmission according to the first aspect of the present invention, the one-way hardware control unit is configured to store the motor limit drive amount from the stored motor rotation position at power-off. It is characterized in that a margin is added to the minimum motor drive amount up to the limit position to obtain the margin.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the one-way hardware limit position of the motor is a limit position on the lowest speed gear ratio side. The reference position of the motor is a motor rotation position corresponding to a lowest speed gear ratio.

According to a fourth aspect of the present invention, there is provided the initialization apparatus of the transmission control apparatus for a continuously variable transmission according to any one of the first to third aspects, wherein the motor is provided if the vehicle is running immediately after turning on the power of the transmission controller. Is initialized as the stored motor rotation position when the power is turned off.

According to a fifth aspect of the present invention, there is provided the initialization apparatus of the transmission control device for a continuously variable transmission, wherein the transmission controller according to the fourth aspect of the invention is configured such that when the stored value relating to the motor rotational position at the time of power-off is not valid. The above-mentioned initialization when the vehicle is running immediately after the power is turned on is prohibited.

According to a sixth aspect of the present invention, in the initialization apparatus of the transmission control device for the continuously variable transmission according to any one of the first to fifth aspects, the stored value relating to the motor rotation position when the power is shut off is not valid. In the case, the stored motor rotation position at power-off is replaced with the hardware limit position in the other direction to contribute to the initialization operation of the motor during a stop immediately after power-on of the transmission controller. It is a feature.

[0020]

According to the first aspect of the present invention, the transmission control device operates the transmission control valve by rotating the motor in accordance with a command value corresponding to the target transmission ratio, and uses the transmission control pressure output by the transmission control valve to control the continuously variable transmission. Is shifted toward the target gear ratio. In the first invention, the rotational position of the motor when the shift controller of the continuously variable transmission is cut off from the power source is stored, and when the power of the shift controller is turned on, the stored motor at the time of turning off the power is stored. Based on the rotational position, the motor limit drive amount required to operate the motor to the hardware limit position in one direction is calculated. Then, during a stop immediately after power-on of the transmission controller, the motor is commanded to operate by the motor limit drive amount from the motor rotation position at the time of power shutoff, and is operated to the one-way hardware limit position. The motor is returned from the one-way hardware limit position to the reference position in the other direction, and a command value to the motor when the initialization operation of the motor is completed is initialized as a command value corresponding to the reference position. I do.

Therefore, a switch for detecting that the motor drive position has reached the reference position is not required, and the failure of the switch does not cause a decrease in reliability or a disadvantage in cost. In addition, based on the stored motor rotation position when the power is turned off, the motor limit drive amount required to operate the motor at the hardware limit position in one direction is calculated, and the motor limit drive amount is commanded to the motor. Is operated at the hardware limit position in the above one direction,
The motor operation command for operating the motor to the one-way hardware limit position is always minimal, and as soon as the motor reaches the one-way hardware limit position, the motor is returned to the reference position in the other direction. As a result, the initialization operation of the motor can be completed in a short time, and the time required to initialize the motor command value can be reduced.

In the second invention, the motor limit drive amount is obtained by adding a margin to the stored minimum motor drive amount from the motor rotation position at the time of power-off to the one-way hardware limit position. Therefore, even if there is a slight deviation (step-out) between the motor operation command and the actual motor drive position, the above margin allows the motor to be reliably moved from the power-off position when the power of the transmission controller is turned on. Can be operated up to the one-way hardware limit position,
The initialization operation of the first invention can be further ensured.

In the third invention, the one-way hardware limit position of the motor is a limit position on the lowest speed ratio side, and the reference position of the motor is a motor rotation position corresponding to the lowest speed ratio. In the initialization operation, the motor is operated from the motor rotation position at the time of power-off to the limit position on the low speed gear ratio side, and then is returned to the motor rotation position corresponding to the lowest speed gear ratio in the direction of the high gear ratio. It will be. By the way, at the time of stopping to perform the initialization,
Since the gear ratio is usually near the lowest gear ratio,
According to the third aspect, the initialization operation stroke of the motor can be reduced, and the initialization can be completed promptly also in this regard.

In the fourth invention, if the vehicle is running immediately after the power of the transmission controller is turned on, the command value to the motor is initialized as the stored motor rotation position at the time of power-off. 3 Even if the vehicle cannot be initialized according to the invention, the motor command value can be initialized in a different manner even when the vehicle is running, and useful initialization is performed when the vehicle is running immediately after turning on the power of the transmission controller. Technology can be provided.

In the fifth invention, if the stored value relating to the motor rotational position at the time of power-off is not valid, the initialization is prohibited when the vehicle is running immediately after power-on of the transmission controller. In such a case, if the initialization operation during traveling as in the fourth aspect of the invention is performed, the initialization can be illegally performed, and the illegal initialization can be avoided.

In the sixth invention, when the stored value relating to the motor rotation position at the time of power-off is not valid, the stored motor rotation position at power-off is replaced with the hardware limit position in the other direction. Therefore, when the stored value of the motor rotational position when the power of the transmission controller is turned off is not valid, the power of the transmission controller is turned on. Immediately after the vehicle is stopped, the motor limit drive amount given to the motor during the initialization operation of the motor becomes the maximum value equivalent to the motor full stroke, and even in such a case, the one-way hardware is surely moved from the position at the time of power-off. The motor can be operated to the limit position, and the initialization operation of the motor can be ensured.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of an initialization device applied to a shift control device for a V-belt type continuously variable transmission. The V-belt type continuously variable transmission is a primary pulley as an input pulley to which engine rotation is input. 1 and a secondary pulley 2 as an output pulley for outputting rotation after shifting, and a V-belt 3 is wound around the primary pulley 1 and the secondary pulley 2 to form a transmission system. The V-belt type continuously variable transmission has two pulleys 1,
By changing the diameter of the winding arc of the V belt 3 with respect to 2, the transmission ratio between pulleys, that is, the gear ratio can be changed steplessly.

To enable such a continuously variable transmission, a ply
Mari pulley 1 faces pulley V
The movable flange 1b forming the groove can be displaced in the axial direction.
Similarly, the secondary pulley 2 is
The movable flange 2b that forms the pulley V groove facing the axis
It can be displaced in the direction. And on the movable flange 1b
The shift control pressure P in the direction toward the fixed flange 1a _SAct
And the movable flange 2b faces the fixed flange 2a.
Line pressure P in the direction_LAnd the shift control pressure P_SAnd Rye
Pressure P_LV bell for both pulleys 1 and 2 according to the pressure difference between
Step 3 continuously changing the winding arc diameter of step 3
Shall be performed.

Here, a line pressure control system for controlling the line pressure P _L will be described.
A pressure regulator valve 12 for adjusting the operating oil to the line pressure P _L , a pressure modifier valve 13 for supplying a modifier pressure P _m for line pressure control to the pressure regulator valve, and a pressure modifier valve 13. A line pressure solenoid 14 for controlling the valve 13 and a constant pressure P applied to the solenoid 14
_And a pilot valve 15 for supplying _C.

The pressure regulator valve 12, while leakage of hydraulic oil from the pressure source 11 to the circuit 16, also with a drain from the drain port 12 _a as required line pressure according to the modifier pressure P _m P _L Adjust the pressure. The pilot valve 15 is supplied to the line pressure solenoid 14 leaks oil into a constant pressure P _C from the circuit 16, the line pressure solenoid 14 in the duty pressure P _D corresponding to a constant pressure P _C in the drive duty D modifier valve 13 is applied.
The modifier valve 13 converts the leaked oil from the circuit 16 into a duty pressure P _D , that is, a modifier pressure P _m corresponding to the drive duty D of the line pressure solenoid 14, and applies this to the pressure regulator valve 12 to apply the line pressure P _L.
To the above control. Therefore, the line pressure P _L can be controlled by adjusting the drive duty D of the line pressure solenoid 14, the solenoid drive duty D is set to be determined this by controller 17.

Next, a shift control system will be described. The shift control system comprises a shift control valve 21 for determining a shift control pressure P _S , a shift link 22, and a step motor 23. The speed change link 22 has one end connected to the movable flange 1 b of the primary pulley 1.
The other end is connected to a shifter 24 which is displaced together with the other end so as to be displaceable by a step motor 23, and the both ends are pivotally connected to a spool 21 a of the speed change control valve 21. Here the shift control valve 21 is intended to produce a line pressure P _L to the shift circuit 26 and the pressure reduction control pressure P _S from the circuit 25, when it is raised in FIG spool 21a, the shift control pressure circuit 26 line pressure when increasing the speed change control pressure P _S in communication with the circuit 25, it is lowered in FIG spool 21a, the shift control pressure circuit 26
Was intended to reduce the shift control pressure P _S in communication with the drain port 21b, the stroke of the spool 21a shall be controlled via the speed change link 22 by a step motor 23. Then, the rotational position of the step motor 21 is
It is determined by the controller 17 as a shift controller, and the shift control described later is executed by this.

The controller 17 performs the line pressure control via the solenoid 14 and the shift control via the motor 23 as described above, as well as the shift control device shown in FIG. Initialization (to take the sign between them) shall also be performed. Therefore, the controller 17 includes a vehicle speed sensor 18 for detecting the vehicle speed VSP.
, A signal from a throttle opening sensor 19 for detecting an engine throttle opening TVO, a signal from an oil temperature sensor 20 for detecting a transmission working oil temperature TMP, and a parking brake switch that is turned on during the operation of the parking brake. 2
7 are input.

At the time of the above-mentioned initialization and shift control, the controller 17 performs these operations according to the control program shown in FIG. First, at step 31, the controller 17
Whether it is the first time since the power was turned on, that is, 1
It is determined whether it is the first time or not, and if it is the first time, at step 32, the motor rotational position stored value M · s at the time of the previous power-off is
It is determined whether or not the step is valid. For this determination, a general checksum-based determination method used for determining the normality of the backup RAM in the controller is adopted, and it is determined whether or not the motor rotation position storage value M · step is valid.

The stored value of the motor rotation position M · step
Sets the step motor command value A · step to M · step in the final step 49 in the program shown in FIG.
By keeping the set M · step = A · step even after the controller 17 is turned off, the motor rotation position memory value M · step can be obtained when the power is turned off last time. Can be used as the stored value of the motor rotation position M · step.

In step 31, it is determined that this is the first time after the power of the controller 17 is turned on.
If it is determined that p is valid, at step 33 the vehicle speed V
Whether the vehicle is traveling or stopped is determined based on whether the SP is equal to or greater than a small set value. If the vehicle is stationary, initialization is performed as follows.

First, at step 34, the transmission operating oil temperature TMP is read, and at step 35, the drive speed Step / Speed of the step motor 23 corresponding to the oil temperature TMP.
Determine d. Here, the driving speed S of the step motor 23
The above-described control of the stepping motor drive speed indicates that the step speed decreases as the temperature decreases, and the viscosity resistance of the shift control valve 21 increases as the oil temperature TMP decreases and the required driving force of the stepping motor 23 tends to increase. Offset, temperature T
, The required driving force of the step motor 23 is kept substantially the same.

Next, at step 36, an initialization counter Init.Count of the step motor 23 is set to 0.
Reset to. In step 37, the step motor 23 is driven one step at a time toward the lower speed ratio position and driven at the above-mentioned speed Step / Speed, and the initialization motor drive amount is incremented in step 38 by the initialization counter Init.・ Monitor by Count.

In step 39, the motor limit drive amount necessary for operating the step motor 23 from the motor rotation position at the time of the previous power-off to the limit position closer to the lowest speed ratio of the hardware limit shown in FIG. Is calculated as follows. That is, as shown in FIG. 3, the motor rotational position at the time of the previous power-off is shifted from the position corresponding to the lowest speed gear ratio toward the high speed gear ratio by an amount corresponding to the motor rotational position storage value M · step. To explain a certain case, the number of steps Lo · Lim representing the stroke amount between the motor rotation position memory value M · step and the motor limit position corresponding to the hardware limit position on the side closer to the lowest speed ratio and the lowest speed ratio. Add a margin α to the minimum motor drive amount that is the sum of Step and the motor limit drive amount (M · Step + Lo · Lim · S
step + α).

In step 39, further, the initialization counter Init / Count for monitoring the initialization motor drive amount toward the hardware limit position on the lowest speed ratio side.
Is the motor limit drive amount (M · s) determined as described above.
(Step + Lo · Lim · Step + α), it is determined whether or not the step motor 23 has reached the hardware limit position on the lowest speed ratio side from the motor rotation position at the time of the previous power-off, and reaches the position. Steps 37 and 38 are executed until the step motor 23 is moved to the hardware limit position on the lowest speed ratio side.

As described above, the step motor 23 is temporarily
When operated to the hardware limit position on the low speed gear ratio side,
Control proceeds to step 40, where the timer TM is incremented.
And the increment is tied in step 41.
The TM is a predetermined waiting time TM _SJudge that
Continue until By the way, in step 41
The TM is a predetermined waiting time TM_SJudge that
Then, the timer TM is reset to 0 in step 42
Timer TM determines that the step motor 23 is low.
After operating to the hardware limit position for the high speed gear ratio
The overtime is measured and the elapsed time is a predetermined waiting time TM_S
Is used to determine whether or not the time has reached. Stay
In step 41, the timer TM is set to a predetermined waiting time TM._STo
When it is determined that the state has reached
3 was moved to the lower limit gear ratio hardware limit position
After that, a predetermined waiting time TM_SWhen the time has elapsed,
In steps 43 to 46, the stepping motor 23 is shifted to the high speed side gear ratio.
Drive toward.

In step 43, the initialization counter Init / Count is reset to 0, and in step 4
In step 4, the stepping motor 23 is turned one step at a time in the direction of the high-speed side gear ratio and returned at the above-mentioned speed Step / Speed, and this initialization drive is incremented by the initialization counter Init / Count incremented in step 45 as shown in FIG. When the count value Lo · Lim · Step corresponding to the lowest speed ratio existing inside the hardware limit is reached as shown in, the process is continued until it is determined in step 46, and the step motor 23 is set to correspond to the lowest speed ratio. Return to the position and operate.

As described above, the initialization operation of the step motor 23 is performed. When the step motor 23 reaches the position corresponding to the lowest speed ratio, the control proceeds to step 47, where the control of the step motor 23 is performed. Command value As
Initialization is performed so that step is set to 0 corresponding to the lowest speed ratio. Thus, the step motor command value A · step matches the actual rotational position of the step motor 23, and it is possible to accurately perform the later-described shift control based on this.

The shift control is performed in step 48.
In this shift control, the controller 17 determines the vehicle speed V based on a map corresponding to the shift control characteristics shown in FIG.
The target input rotational speed _NiS is determined from the SP and the throttle opening TVO, and the step motor 23 corresponding to the input rotational speed _NiS is determined.
Is instructed to the motor 23 as the step motor command value A · step. Here the step motor 23
Is driven at the above-mentioned target rotation position at the above-mentioned speed Step / Speed, whereby the step motor 23 rotates the link 22 around the shifter 24 to stroke the speed change control valve spool 21a to the corresponding position. As a result, the shift control valve 21 changes the shift control pressure P _S, and the movable flanges 1b, 2b of the pulleys 1, 2 are displaced, so that the speed ratio becomes a speed ratio corresponding to the target input rotation speed _NiS. Speed control of the continuously variable transmission.

As the speed change progresses, the movable flange 1b of the primary pulley 1 rotates the speed change link 22 around the step motor 23 via the shifter 24 so as to return the speed change control valve spool 21a to the original stroke position. When the speed ratio reaches the speed ratio corresponding to the target input rotation speed _NiS , the speed change control ends, and the speed ratio can be maintained.

Although the controller 17 does not show the line pressure P _{L in} the control, the controller 17 performs the above-described transmission based on a map corresponding to a predetermined line pressure control characteristic defined by the transmission ratio and the throttle opening TVO. determined the line pressure P _L to be the target from the ratio and the throttle opening TVO, the line pressure solenoid 1 the drive duty D corresponding to this
Command 4 Here the solenoid 14 is applied to the modifier valve 13 and the duty pressure P _D and constant pressure P _C in accordance with the drive duty D from the pilot valve 15, modifier valve 13 modifier pressure P corresponding to the duty D the _m is applied to the pressure regulator valve 12, pressure regulator valve 12, pressure regulating hydraulic oil from the pressure source 11 to the line pressure P _L corresponding to the duty D. Or the line pressure P _L by is controlled along a predetermined line pressure control characteristics described above.

The initialization of the motor command value A · step as described above in steps 36 to 47 in FIG. 2 is performed in step 51 even if it is determined in step 31 that it is the second time after power-on. It is determined that the vehicle is stopped based on the vehicle speed VSP in step, and further executed in step 52 each time it is determined that the parking brake switch 27 is ON (the parking brake is being operated) and the minimum speed ratio is being selected. The motor command value initialization operation is performed. However, even if it is determined in step 51 that the vehicle is running,
If it is determined in step 52 that the parking brake is not operating or the minimum speed gear ratio is not selected, the gear shift control in step 48 is performed without performing any motor command value initialization operation. .

If it is determined in steps 32 and 51 that the vehicle is running, the command value A · step of the step motor 23 is changed to the previous value in step 53 whether or not the first time since the power is turned on. Motor command value A · s as motor rotation position memory value M · step at power-off
After the initialization of the step, the shift control in step 48 is performed.

If it is determined in step 32 that the motor rotational position stored value M · step at the previous power-off is not valid, the control is stopped here as long as it is determined in step 54 that the vehicle is traveling. In addition, it is assumed that the shift is not caused and the motor command value A · step is not initialized. Thus, when the vehicle is stopped, the motor rotational position memory value M · step is set to a value corresponding to the full stroke corresponding to the motor stroke between the motor rotational position corresponding to the lowest speed gear ratio and the motor rotational position corresponding to the highest speed gear ratio in step 55. After the step,
That is, after determining that the motor was at the motor rotation position corresponding to the highest speed gear ratio at the time of the previous power-off, step 36
To 47 as described above.
Initialize p.

In the above-described embodiment, the position of the step motor 23 when the controller 17 is turned off is stored as a motor rotation position storage value M · step when the power is turned off (step 49). The stored motor rotation position M at power-off is
The motor limit drive amount (M · step + Lo · Lim · St required to operate the step motor 23 to the hardware limit position on the lowest speed gear ratio side based on the step.
ep + α), and the stepping motor 23 is stopped during the stop immediately after the power is turned on, and the motor rotation position M · st when the power is turned off is determined.
ep to the above motor limit drive amount (M · step + Lo ·
(Lim · Step + α), and after operating at the minimum speed ratio side hardware limit position (steps 37 to 39), the lowest speed shift is performed from the hardware limit position in a direction to obtain a high speed ratio. The operation is returned to the position corresponding to the ratio (steps 44 to 46), and the command value A · step to the step motor 23 when the initialization operation of the step motor 23 is completed is set as the command value 0 corresponding to the lowest speed gear ratio. (Step 47) Since the motor command value A · step is initialized, the following operation and effect can be obtained.

In other words, a switch for detecting that the motor 23 has reached the reference position is not necessary for setting the step motor 23 to a position corresponding to the minimum speed ratio as a reference at the time of the above initialization. There is no loss of reliability or cost penalty due to failure. Further, the stored motor rotation position M · s at power-off is stored.
Based on the step, the motor limit drive amount (M · step + Lo · Lim · Step + α) required to operate the motor 23 to the hardware limit position on the lowest speed ratio side is calculated, and this is commanded to the motor 23. Since the motor is operated at the hardware limit position, a motor operation command (M · step + Lo · Lim · Step) for operating the motor 23 at the hardware limit position is provided.
+ Α) is always the minimum necessary, and as soon as the motor 23 reaches this hardware limit position, the motor 23 is returned to the reference position corresponding to the lowest speed ratio in the direction of the high speed gear ratio, and the motor 23 is initialized. The operation can be completed in a short time and the time required for initializing the motor command value can be reduced.

In particular, the motor limit drive amount (M · s)
As illustrated in FIG. 3, the motor rotation position (M · ste
p) to the lowest speed gear ratio side hardware limit position (Lo.
Lim · Step) to the minimum motor drive amount (M · s)
Step + Lo · Lim · Step) and the margin α are obtained (step 39), so that the motor command value A · st
Even if there is a slight deviation (step-out) between ep and the actual motor drive position, the motor 23 is surely moved from the power-off position (M · step) to the lowest speed ratio by the above margin α. Hardware limit position (Lo ・ Lim ・ Step)
, And the above-mentioned initialization action can be further ensured.

Further, the limit position when the motor 23 is set to the hardware limit position at the time of initialization is set to the limit position on the lowest speed ratio side, and thereafter, the reference position when the motor 23 is returned to the high speed ratio direction is set to the minimum speed change. Because the motor rotation position corresponding to the ratio, when the vehicle is stopped to perform the initialization,
In most cases, since the speed ratio is near the lowest speed ratio, the initialization operation stroke of the motor 23 can be reduced, and the initialization can be completed quickly also in this regard.

If the vehicle is running immediately after the power of the controller 17 is turned on (step 33), the command value A · step to the motor 23 is stored in the motor rotation position memory value M when the power is turned off.
Since the initialization is performed as a step (step 53), even when the vehicle is stopped immediately after the controller 17 is turned on and the vehicle cannot be used for the initialization, the motor command value A.step is initialized. It can be carried out.

By the way, if the motor rotation position storage value M · step at power-off is not valid (step 32),
Since the initialization (step 53) in the case where the vehicle is running immediately after turning on the power of the controller 17 is prohibited (step 54), in such a case, if the initialization operation during the running is forcibly performed, the initialization is performed. Such illegal initialization can be avoided while the illegalization is performed illegally.

When the stored value M.step of the motor rotational position at the time of power-off is not valid (step 3).
2) Also, in the motor initialization operation (steps 37 to 39) immediately after the controller 17 is turned on and the vehicle is stopped, the motor rotation position storage value M · ste when the power is turned off is set.
p is replaced by the hardware limit position on the side of the highest speed gear ratio (step 55) and the initialization operation (steps 37 to 3) is performed.
In order to perform 9), if the motor rotation position storage value M · step at power-off is not valid, the controller 1
7, the motor limit drive amount (M · step + Lo · Lim · St given to the motor 23 during the motor initialization operation (steps 37 to 39) during a stop immediately after the power is turned on.
ep + α) is the maximum value corresponding to the full stroke of the motor. In such a case, the motor 23 can be reliably operated from the position M · step at the time of power-off to the hardware limit position on the lowest speed ratio side. Can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a shift control device of a V-belt type continuously variable transmission including an initialization device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a program for initialization and shift control executed by a controller in the example.

FIG. 3 is a diagram illustrating a relationship between a gear ratio and a stroke of a step motor in the same example.

FIG. 4 is a shift control pattern diagram used for shifting in the same example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Primary pulley 1b Movable flange 2 Secondary pulley 2b Movable flange 3 V belt 11 Pressure source 12 Pressure regulator valve 13 Pressure modifier valve 14 Line pressure solenoid 15 Pilot valve 17 Controller (transmission controller) 18 Vehicle speed sensor 19 Throttle opening sensor 20 an oil temperature sensor 21 shift control valve 22 shift link 23 step motor 24 shifter 25 line pressure circuit 26 shift control pressure circuit 27 parking brake switch P _L line pressure P _S shift control pressure

Claims (6)

[Claims] A speed control valve is operated by rotating a motor according to a command value corresponding to a target speed ratio, and the speed is controlled by a speed control pressure output by the speed control valve in response to the operation. In the step-variable transmission, a rotational position of the motor when the shift controller of the continuously variable transmission is cut off from a power source is stored, and when the power of the shift controller is turned on, the stored motor at the time of turning off the power is stored. The motor limit drive amount required to operate the motor to the hardware limit position in one direction is calculated based on the rotational position, and the motor is turned off during a stop immediately after power-on of the transmission controller. Command from the current motor rotation position to operate by the motor limit drive amount to operate in the one-way hardware limit position, and then move from the one-way hardware limit position to the reference position in the other direction. Wherein the motor command value is initialized by setting a command value to the motor when the initialization operation of the motor is completed as a command value corresponding to the reference position. Initialization device for transmission control device for transmission. 2. The motor limit driving amount according to claim 1, wherein the marginal driving amount is obtained by adding a margin to the stored minimum motor driving amount from the motor rotation position at power-off to the one-way hardware limit position. An initialization apparatus for a shift control device for a continuously variable transmission, wherein the initialization device is configured as described above. 3. The motor according to claim 1, wherein the one-way hardware limit position of the motor is a limit position on the lowest speed gear ratio side, and the reference position of the motor is a motor rotation position corresponding to the lowest speed gear ratio. An initialization device for a shift control device for a continuously variable transmission, characterized in that: 4. The vehicle according to claim 1, wherein the vehicle is running immediately after power-on of the transmission controller.
An initialization device for a shift control device for a continuously variable transmission, wherein a command value to the motor is initialized as the stored motor rotation position when the power is turned off. 5. The apparatus according to claim 4, wherein when the stored value relating to the motor rotational position at the time of power-off is not valid, the initialization is prohibited when the vehicle is running immediately after power-on of the transmission. An initialization apparatus for a shift control device for a continuously variable transmission, wherein the initialization device is configured as described above. 6. The power supply according to claim 1, wherein the stored motor rotation position at power-off is not valid, and the stored motor rotation position at power-off is stored in the other direction. Characterized in that it is configured to contribute to the initialization operation of the motor during stoppage immediately after the power supply of the transmission controller is turned on.