JPH0679887B2 - Shift control device for toroidal type continuously variable transmission for vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a toroidal type continuously variable vehicle for operating a toroidal type continuously variable transmission based on gear shift control information such as throttle opening and vehicle speed. The present invention relates to a shift control device for a transmission.

[Conventional technology]

Generally, when a toroidal type continuously variable transmission is applied as a vehicle continuously variable transmission, when setting a gear ratio by gear change control information such as a throttle opening detection value and a vehicle speed detection value,
It is necessary to control so that the engine speed becomes lower as the throttle opening becomes smaller. Therefore, it is preferable to set the shift position of the toroidal type continuously variable transmission to the speed increasing side as the throttle opening becomes smaller.

Therefore, as a conventional shift control device for a toroidal continuously variable transmission for a vehicle, the shift position of the toroidal continuously variable transmission is set to an accelerating side in accordance with a decrease in the throttle opening based on the throttle opening detection signal. It is common to control so that

[Problems to be solved by the invention]

However, in the conventional shift control device for a toroidal continuously variable transmission for a vehicle, the shift position of the toroidal continuously variable transmission is controlled to be on the speed increasing side as the throttle opening becomes smaller. Therefore, if the throttle opening is set to "0" or minimum by releasing the accelerator pedal when going downhill, the gear shift position is controlled to the speed increasing side, and finally the overdrive position is reached and the engine braking is completely ineffective. There is a problem in that there is no safety condition and there is no choice but to use a lot of foot brakes, which is a safety issue. Also, in the case of mountain climbing with continuous sharp curves,
Since the accelerator pedal is returned before the curve, the gear shift position is controlled to the speed increasing side in this case as well, and the vehicle is in an accelerating state, and there is a problem that the cornering characteristics deteriorate and there is a danger.
In addition, when the accelerator pedal is depressed again in the latter half of cornering, the kickdown amount becomes too large, the time required for rising becomes long, and the responsiveness deteriorates.

In order to solve the above problems, a shift mechanism like a general automatic transmission may be provided with a fixed gear ratio “2” range, “1” range or “L” range in addition to a normal drive range. Although it is considered, in this case, each of the above problems can be solved to some extent, but since the gear ratio is fixed, there is no choice for the driver, and the gear ratio is not necessarily optimal for road and traffic conditions. The current situation is that it cannot be said that the range can be selected.

The present invention has been made in view of the problems of the above-mentioned conventional example, and when the shift mechanism is provided with a limit range for limiting the upper limit value of the shift to the speed increasing side other than the drive range, when the limit range is selected, In addition, it is an object of the present invention to provide a shift control device for a toroidal type continuously variable transmission for a vehicle, which can solve the problems of the above-mentioned conventional example by allowing the upper limit value on the speed increasing side to be arbitrarily selected. I am trying.

[Means for solving problems]

In order to solve the above problems, the present invention is based on shift control information from shift control information detecting means for detecting shift control information such as a throttle opening command signal, as shown in the basic configuration diagram of FIG. In a shift control device for a toroidal type continuously variable transmission for a vehicle that operates a toroidal type continuously variable transmission, a shift operation amount selecting means for selecting a shift operation amount based on the shift control information, and a speed increasing side. A shift position detector that detects a shift position of a shift mechanism that has at least a limit range that limits a shift position, and a limit that determines whether the shift mechanism is in the limit range based on a detection signal of the shift position detector. The range determining means, the upper limit selecting means for arbitrarily selecting the upper limit on the speed increasing side when the determination result of the limit range determining means is within the limit range, and the upper limit selecting means. The upper limit value correction means for comparing the upper limit value and the gear shift operation amount selected by the gear shift operation amount selection means, and correcting the gear shift operation amount to the upper limit value or less; A control means for controlling the toroidal type continuously variable transmission based on an operation amount.

[Action]

According to the present invention, when the limiting range for limiting the shift to the speed increasing side of the shift mechanism is selected, the upper limit value of the speed increasing side is arbitrarily selected by the upper limit value selecting means, and the upper limit of the speed increasing side thus selected is selected. Based on the value, the upper limit correction means corrects the shift operation amount selected by the shift operation amount selection means on the basis of the shift control information such as the throttle opening and vehicle speed detected by the shift control information detection means and increases the speed. The upper limit of the side is limited, and the continuously variable transmission is controlled by the control means based on the corrected shift operation amount, so that the driver can change the shifting operation of the toroidal type continuously variable transmission according to road conditions, traffic conditions, etc. You can choose.

〔Example〕

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

2 to 5 are views showing an embodiment of the present invention.

First, the configuration will be described. In FIG. 2, T is a toroidal type continuously variable transmission as a continuously variable transmission, and C is a control device.

In the toroidal continuously variable transmission T, an input disk 2 and an output disk 3 are coaxially and pivotally mounted in a housing 1. The input disk 2 and the output disk 3 have the same shape and are arranged in line symmetry, and their opposing surfaces cooperate with each other to form a toroidal surface so as to have a semicircular shape when viewed in an axial cross section. Then, a pair of power rollers 4 and 5 are tiltably disposed in a toroidal cavity formed by the toroidal surfaces of the input disk 2 and the output disk 3, and these power rollers are in contact with both disks 2 and 3, respectively. In this case, the power rollers 4,5 are rotatably attached to the trunnions 6 and 7 and tiltably supported about a pivot axis O which is the center of the toroidal surfaces of the input disk 2 and the output disk 3.

A viscous material having a large friction resistance is interposed on the contact surfaces of the input disks 2 and the output disks 3 with the power rollers 4 and 5, and the rotational force input to the input disks 2 is transferred to the power rollers 4 and 5. To the output disc 3, and the change of the transmission ratio, that is, the speed change ratio causes the trunnions 6 and 7 to move to the pivot shaft OO.
Tilting angle θ of power rollers 4 and 5
Is done by changing. The movement of the trunnions 6 and 7 in this case is performed by hydraulic cylinders 9a to 9d provided at both ends of the trunnions 6 and 7, spool control valve 10 controlling hydraulic pressure supply to these hydraulic cylinders 9a to 9d, and trunnion 6, respectively. It is controlled by a moving mechanism 12 formed by a precess cam 11 formed integrally.

The spool control valve 10 includes a valve body 10e having an inlet port to which the fluid supply pipe 10a is connected, an outlet port to which the distribution pipes 10b and 10c are connected, and a discharge port to which the fluid discharge pipe 10d is connected, The valve body 10e has a spool 10f which is slidable in the vertical direction, and the valve body 10e is mounted on the outer surface of the housing 1 of the continuously variable transmission T.
It is arranged so as to be slidable in the vertical direction by being urged upwardly by and rotating a transmission means 13 such as a screw parallel to the column.

The spool 10f is engaged with the cam surface of the recess cam 11 via the engagement roller 10i, and is moved up and down according to the rotation of the trunnion 6. The trunnion 6, the precess cam 11 and the spool 10f constitute a mechanical feedback means.

Further, the distribution pipe 10c is connected to the fluid pressure cylinders 9a and 9d, and the distribution pipe 10b is connected to the fluid pressure cylinders 9b and 9c.

Then, the spool control valve 10 connects the valve body 10e to the pulse motor 12 via a transmission means 13 such as a screw that converts a rotational force into a linear driving force, and the valve body 10e is rotated according to the rotation of the pulse motor 12. Is controlled by moving up and down against the return spring 10h.

Reference numeral 14 is a vehicle speed detector configured of, for example, a tacho generator that detects the number of revolutions of the output disk 3 and outputs a detection signal corresponding to the vehicle speed.

Further, 15 is a throttle opening detector configured by, for example, a potentiometer that outputs a detection signal U corresponding to the throttle opening, 16 is a brake switch as a braking state detecting means, 17 is a powerful economy mode selection switch, 18
Outputs the detection signal S corresponding to the shift position of the shift mechanism SM having at least the drive range "D" for normal traveling, the limit range "L" in which the upper limit value of the speed increasing side is set, and the neutral range "N" Shift position detector, 19U and 19D
Is an upper limit value setting switch for setting the upper limit value of the speed increasing side of the power rollers 4 and 5 arranged on the instrument panel of the driver's seat, and 20A and 20D are the power roller 4 arranged close to the precess cam 11. It is a limit position detector that detects a speed increase side limit position and a deceleration side limit position. Here, the brake switch 16 is attached in association with a brake pedal (not shown), and has a logical value "0" in a non-braking state where the brake pedal is not depressed, and a logical value in a braking state where the brake pedal is depressed. Output the braking detection signal of "1".

The control device C is provided with an input amplifier 21, a gear shift operation amount selection means 22, a limit range determination means 23, an upper limit value selection means, to which analog detection signals of various detection signals are supplied as gear shift control information serving as a reference for gear ratio selection. 24, an upper limit correction means 25, a control means 26 and a prohibition means 27.

The specific configuration of the control device C is as shown in FIG.
The input amplifier 21, the shift operation amount selection means 22, the shift operation amount selection means 22, the limit range determination means 23, the upper limit value selection means 24, the upper limit value correction means 25, the control means 26 and the prohibition means 27.
And the pulse motor 12
And a pulse distribution circuit 29 for driving the.

The input amplifier 21 supplies the throttle opening detection signal U from the throttle opening detector 15 and the detection signal V from the vehicle speed detector 14 of the toroidal type continuously variable transmission T, which serve as a reference for selecting the gear ratio, as the shift control information. Then, these are amplified to a predetermined value and output.

The microcomputer 28 is an interface circuit, for example.
30, the arithmetic processing unit 31, and the storage unit 32 are included at least, and predetermined arithmetic processing is executed based on an input signal supplied to the interface circuit 30 to shift the shift mechanism SM to the drive range "D". While operating, a predetermined calculation is performed based on the throttle opening detection signal U and the vehicle speed detection signal V to calculate the operation amount of the pulse motor 12, and this is output to the pulse distribution circuit 27 to drive the pulse motor 12. As a result, the power rollers 4 and 5 are tilt-driven in the range from the maximum deceleration position to the maximum acceleration position, and when the shift mechanism SM is shifted to the limit range “L”, the upper limit value setting switches 19U, 19D The upper limit position on the speed-increasing side of the power rollers 4 and 5 is set according to the output of, and the power rollers 4 and 5 are tilted within the range between the upper limit position and the maximum deceleration position.

The interface circuit 30 has an A / D conversion function and a D / A conversion function, and on its input side, a braking detection signal B from the brake switch 16, a selection signal M from the powerful economy mode selection switch 17, and a shift position detector. The shift position detection signal S from 18, the output signal OA of the input amplifier 21, the output signals LSU and LSD of the upper limit value setting switches 19U and 19D, and the power roller 4,
Detection signals AL and B of speed-up and deceleration-side limit detectors 20A and 20D that detect speed-up and deceleration-side limit positions of 5 respectively
L is supplied, and the output side is connected to the display device DP arranged on the instrument panel of the driver's seat and the pulse distribution circuit 29 for driving the pulse motor 12.

The arithmetic processing unit 31 executes arithmetic processing in accordance with a predetermined processing program stored in advance in the storage unit 32 based on the input signal supplied to the interface circuit 30, and finally, the trunnion 6 of the toroidal type continuously variable transmission T, The drive control signal CS of the pulse motor 12 that drives 7 is output.

The storage device 32 stores a processing program necessary for the arithmetic processing of the arithmetic processing device 31, and also the arithmetic processing device 31.
Stores various constants required in the process of step 1 and shift control information-shift operation amount conversion table described later, and
The processing results of the processing steps of the arithmetic processing unit 31 are sequentially stored.

Next, the processing procedure of the arithmetic processing unit 31 will be described with reference to FIG.

That is, when the power is turned on, first, initialization is performed in step, and then various detection signals from the input amplifier 21 and shift position detection signal S etc. are read as shift control information, and then the process proceeds to step to shift control information. Select a predetermined shift control information-shift operation amount conversion storage table stored in advance in the storage device 32 in order to calculate the shift operation amount to be controlled to a predetermined gear ratio based on, and refer to the selected storage table. Then, the target motion amount Ln is calculated and stored in the motion amount storage area of the storage device 32.

Next, the process proceeds to step, and it is determined based on the shift position detection signal from the shift position detector 18 whether or not the shift mechanism SM is shifted to the limit range "L". If the determination result is that it is shifted to the limit range "L", the process proceeds to step, the current speed-up side upper limit value is displayed on the display device DP, and then the process proceeds to step to set the upper limit value setting switch. It is determined whether the 19U is in the on state. If the determination result is on, the process proceeds to step to change the upper limit value Li of the target operation amount Ln to the speed increasing side, and if it is off, the process proceeds to step and the upper limit setting switch 19D is turned on. Or not. When the determination result is the ON state, the process proceeds to step and the upper limit value Li of the target operation amount Ln is changed to the deceleration side. Then, when the step and the determination result of the step are the upper limit value setting switch 19D is in the off state, it is determined whether the target operation amount Ln calculated in the step moves to step or less than the upper limit value Li, Ln ≦
When it is Li, it is determined that it is within the set range and the process proceeds to the step described later. When Ln> Li, the process proceeds to the step and the value of the target operation amount Ln is corrected to the upper limit value Li and then the step is performed. Move to.

On the other hand, if the determination result of the step is that the shift mechanism SM is shifted to a range other than the limited range “L”, the process proceeds to step to release the upper limit value Li,
Set the upper limit default value Li for handling the next "L" range selection, and then move to step.

In this step, the shift mechanism SM drives the drive range "D" based on the shift position detection signal S from the shift position detector 18.
It is determined whether or not it has been shifted to. When the result of the determination is that the shift mechanism SM is shifted to a range other than the drive range "D", the process directly shifts to the step described later, waits for a predetermined time t, and then returns to the step, which is the drive range "D". Occasionally, the process moves to step.

In this step, the shift operation amount Ln calculated in the above step or the corrected shift operation amount Ln (=
Li) absolute value | Ln |
Select the drive speed of. That is, the absolute value of motion amount | Ln |
Is output to the pulse motor 12 as described later when the operation amount of the trunnions 6 and 7 per shift operation, that is, the tilt angle change amount of the power rollers 4 and 5 is larger than a predetermined set value Lk, such as during kickdown. Select a high-speed drive pulse interval that shortens the drive pulse interval.For example, if the preset operation amount Lk is less than or equal to the preset operation amount Ls during general acceleration / deceleration and is greater than the set operation amount Ls, the medium speed that drives at the normal speed When the driving pulse interval is set and is less than or equal to the set operation amount Ls, a large low-speed driving pulse interval is selected so as to drive the pulse motor 12 at a low speed, and these are stored in the storage device 32.
After being stored in the drive pulse interval storage area, the shift processing from step is performed.

In step, the current position P _p of the pulse motor 12 is read from the storage device 32, the operation amount Ln is added to this to calculate the target position P _o , and this is stored in the current position storage area of the storage device 32. Further, the number of operation pulses of the pulse motor 12 is calculated based on the operation amount L stored in the operation amount storage area, this is temporarily stored in a predetermined storage area of the storage device 32, and further formed in the predetermined storage area of the storage device 32. Operation pulse counter 32a
Is loaded with the number of operating pulses, and then the distribution counter in the pulse distribution circuit 29 is reset.

Then, the process shifts to the step, the braking detection signal from the brake switch 16 is read, and it is determined whether or not the braking state is in accordance with whether or not this is the logical value "1". If the result of the determination is that it is in the braking state, the process proceeds to step and it is determined whether or not the operation amount of the pulse motor 12 calculated in the step is on the speed increasing side. At this time, when the operation amount of the pulse motor 12 is on the speed increasing side, the process directly proceeds to the step described later and waits for a predetermined time t and then returns to the step to maintain the operation amount of the pulse motor 12 on the current condition or on the deceleration side. When there is a certain time, the process moves to the step.

In this step, the operation pulse calculated in the above step is output to the pulse distribution circuit 29.

Then, the process proceeds to step, and the operation direction of the trunnions 6 and 7 is determined, and when this is the speed increasing direction, the process proceeds to step.

In this step, the power rollers 4 and 5 reach the limit position on the speed increasing side by reading the detection signal AL from the speed increasing side limit detector 20A and determining whether or not this is the logical value "1". If it is before reaching the limit position, the process proceeds to step.

In this step, the operation pulse number counter 32a is counted down by "1" and the operation pulse number counter 32a is counted down.
By determining whether the count value of 32a is zero, it is determined whether the operation of the pulse motor 12 is completed.
At this time, when the operation of the pulse motor 12 is not completed, the process returns to the step, and the next drive pulse CS is output so that the pulse interval selected in the step is obtained,
When the operation of the pulse motor 12 is completed, the process shifts to step, waits for a delay time of about 1/5 of the operation time required for the series of processes, and then returns to step.

Further, when the step determination result is to operate the trunnions 6 and 7 in the deceleration direction, the process proceeds to step and the detection signal BL of the deceleration side limit detector 20D is read,
It is determined whether or not the trunnions 6 and 7 have reached the limit position on the deceleration side.If the trunnions 6 and 7 have not reached the limit position, go to the step. Emergency stop and then move to step.

Furthermore, when the determination result of the step reaches the limit position, the process shifts to the step.

Here, the processing of step corresponds to the shift operation amount selection means 22, the processing of step corresponds to the limit range determination means 23, the processing of steps ~ and the upper limit value setting switch 19U,
19D corresponds to the upper limit value selecting means 24, the processing of step corresponds to the upper limit value correcting means 25, and steps ,.
The processing of 1 corresponds to the control means 26, and the processing of step corresponds to the prohibition means 27.

Next, the operation of the above embodiment will be described. Now, assuming that the vehicle is in a stopped state and the ignition switch is in an off state, the arithmetic processing unit of the control unit C is in this state.
The processing of FIG. 4 is not executed at 31, and the toroidal type continuously variable transmission T does not perform the gear shifting operation.

When the ignition switch is turned on in this stopped state, the processing shown in FIG. 4 is executed by the arithmetic processing unit 31 and initialization is first performed in step. At this time, the shift mechanism SM is set to the neutral range “N”. Assuming that the engine is idling and the shift position detection signal S representing the shift is output from the shift position detector 18, in this state, the engine is idling and the clutch is in the off state. Since the engine torque is not transmitted to the input disk 2 of T, in the arithmetic processing unit 31 of the controller C, the vehicle speed is zero in the process of FIG.
After returning to the step, the continuously variable transmission T is held at the maximum deceleration position.

From this state, operate the shift mechanism SM to select the drive range "D", depress the accelerator pedal, put the clutch in the half-clutch state, and put the vehicle in the normal slow start state. The signal S, the powerful economy mode selection signal P, the throttle opening detection signal U by depressing the accelerator pedal, and the rotation speed detection signal V of the output disk 3 of the continuously variable transmission T are read, and these are subjected to speed change control. Storage device as information
The data is temporarily stored in 32 predetermined storage areas.

Next, based on the shift control information stored in the storage device 32, a predetermined shift control information-shift operation amount conversion storage table is selected, and the trunnion is referred to with reference to the selected storage table.
The target shift operation amount Ln for controlling the tilt angle θ of the power rollers 4 and 5 by moving 6 and 7 is calculated. (Step).

Then, from step to step, step to step, and because the vehicle is in a slow start state, it is necessary to perform high-gear control, and it is necessary to shift to overdrive quickly. Therefore, the target operation amount Ln is a preset operation. It becomes larger than the quantity set value L _k . Therefore, by selecting the drive pulse interval PW _H for driving the pulse motor 12 at high speed in step, and stores this in the pulse interval storage area.

Next, in step 32, the target position P _o is calculated from the sum of the motion amount L _n and the current position P _p, and this is calculated in the storage device 32.
In addition to storing the current position information in the current position storage area, the number of pulses to be output to the pulse motor 12 is calculated based on the operation amount Ln, and is then preset in the counter 32a formed in the storage device 32, and the pulse distribution is performed. Circuit 29
Reset the counter in.

Next, it is determined whether or not the brake pedal is in the braking state (step), the vehicle is in the starting state, and the brake pedal is not in the depressed state, which means the non-braking state.
The pulse drive signal CS is output to the pulse distribution circuit 29 so as to move to the step and operate the pulse motor 12.

Next, in a step, it is determined whether the power rollers 4 and 5 are in the tilting direction, that is, whether the continuously variable transmission T is on the speed increasing side or the speed reducing side. When the speed increasing side is reached, the speed increasing side limit position is reached. It is determined whether or not (step), and if it is before the speed increasing side limit operation position, the process proceeds to step and the counter 32a is counted down by "1", and then it is determined whether or not the operation of the pulse motor 12 is completed. Judgment is made by judging whether the count content of is 0 or not.
Since 32a has just been set, the process returns to the step, the pulse interval is the above-described operation is repeated so that the drive pulse interval PW _H. As a result, short pulse interval PW _H
Since the pulse motor 12 is driven by, the rotation speed of the pulse motor 12 becomes high.

Then, when the count value of the counter 32a becomes zero, it is determined in step that the operation of the pulse motor 12 has ended, the process proceeds to step, and after waiting for a predetermined time, returns to step.

Thus, when the pulse motor 12 is rotated by a predetermined amount by the drive pulse signal CS, the spool control valve 10 is lowered against the return spring 10h in response to the rotation, and the fluid supply pipe is moved in response to the movement. The 10a and the distribution pipe 10b are communicated with each other, whereby hydraulic oil is supplied to the hydraulic cylinders 9b and 9c, and the trunnions 6 and 7 move up and down by a predetermined amount. The movement of the trunnions 6 and 7 causes the power rollers 4 and 5 to start tilting toward the speed increasing side. Since the trunnions 6 and 7 also rotate with the tilting of the power rollers 4 and 5, the precess cam 11 rotates and the control valve roller 10i descends, and the spool 10f descends accordingly. Then, when the power rollers 4 and 5 rotate to the predetermined tilt angle θ position, the distribution pipes 10b and 10c and the fluid supply pipe 10a are cut off by the spool 10f, and the movement of the trunnions 6 and 7 is stopped. However, since the movement positions of the trunnions 6 and 7 are displaced from the neutral position, the power rollers 4 and 5 are further tilted in the speed increasing direction, and in this state, the spool 10f is further lowered. Because
The fluid supply pipe 10a and the distribution pipe 10c communicate with each other so that the hydraulic cylinder 9a
And 9d will be supplied with working fluid.
6 and 7 move up and down in the opposite direction. And trunnion
When 6, 7 return to the predetermined neutral position, the tilting of the power rollers 4, 5 is stopped, and eventually the mechanical feedback means is formed by the trunnion 6, the precess cam 11 and the spool 10f. The tilt angle θ is controlled according to the operating position selected by the valve body 10e.

In addition, when the vehicle is suddenly started, it is necessary to rotate the engine to high speed with low control, so the target operation amount Ln is selected according to the throttle opening at that time, and the pulse operation is selected according to the throttle opening. the motor 12 selects the drive pulse interval for driving at a low speed (or intermediate speed) PW _S (or PW _M), which was stored in the pulse interval storage area, in the shift control process in and after step, driving the pulse motor 12 The pulse interval of the drive control signal CS is longer than that in the slow start state, and a relatively slow shift operation is performed.

Furthermore, when the starting state shifts to a relatively high speed traveling state, the value of the target operation amount Ln at that time becomes relatively small, so the drive pulse interval PW _S for driving the pulse motor 12 at a low speed in step. The drive pulse interval PW _H (or PW _S , PW _M ) in the pulse interval storage area.
Instead, it is updated and stored.

Therefore, in the shift control process after the step, the pulse interval of the drive control signal CS for driving the pulse motor 12 becomes long, and the power rollers 4 and 5 are tilted by a predetermined amount by performing a relatively slow shift operation. So in this case,
The riding comfort is secured by sacrificing some responsiveness and suppressing engine speed fluctuation and torque fluctuation.

When the vehicle is traveling on a long downhill from the traveling state and engine braking is required, the shift mechanism SM is shifted from the drive range "D" to the limit range "L". As a result, the shift position detection signal S corresponding to the limited range is output from the shift position detector 18, so in the process of FIG. 4, the process moves from step to step, and the upper limit value Li at that time, that is, the default value (for example, (2nd and 5th speed) is displayed on the display device DP arranged in the driver's seat.

If more engine braking is required in this state, the driver turns on the upper limit value setting switch 19D at hand to move to the step after step and step to shift the upper limit value Li to the deceleration side. Reduce. The change of the upper limit value Li to the deceleration side in this case continuously decreases while pressing the upper limit value setting switch 19D, and the reduced value is displayed on the display device DP, and the upper limit value desired by the driver. Li
Is displayed on the display device DP, the upper limit setting switch 19
By setting D to the off state, the desired upper limit value Li can be selected, and the action of the engine brake can be adjusted accordingly. In addition, in order to change the upper limit value Li to the speed increasing side, the upper limit value setting switch 19D is turned on, and the upper limit value Li is sequentially turned on while it remains in the on state.
Increases to the speed increasing side.

Then, during and after selecting the desired upper limit value Li, it is determined in step whether or not the target shift operation amount Ln calculated in step is equal to or less than the upper limit value Li. When the value is less than or equal to the upper limit value Li, the target shift operation amount Ln at that time is maintained as it is, and the shift process according to the target operation amount Ln is performed after the step, and when the target shift operation amount Ln exceeds the upper limit value Li, After shifting to step and correcting the target shift operation amount Ln to the upper limit value Li, the shift processing after step is performed. As a result, the value of the shift operation amount Ln is limited so as to control the power rollers 4 and 5 within the range between the maximum deceleration position and the speed increasing side upper limit position. The gear shift operation can be performed within the range shown by the diagonal lines, and a desired engine braking force can be obtained.

Also, when traveling uphill with continuous sharp curves,
Similar to the above, by shifting the shift mechanism SM to the limit range "L", the upper limit value on the speed increasing side can be arbitrarily selected, and it is calculated in step by releasing the accelerator pedal immediately before the curve. Even if the shift operation amount Ln becomes a value corresponding to the maximum acceleration position, since the shift operation amount Ln is corrected to the acceleration side upper limit value Li, it is possible to suppress deterioration of the cornering characteristics, It is possible to improve the responsiveness by reducing the kickdown amount when the vehicle is in the re-acceleration state at the cornering end portion.

Further, when the accelerator pedal and the brake pedal are frequently stepped on, such as when driving in an urban area where traffic is congested, by shifting the shift mechanism SM to the limited range "L" as described above, It is possible to prevent the necessary shift to the speed increasing side.

Further, when the accelerator pedal is released from the cruising state and the brake pedal is depressed to shift to the braking state, the braking detection signal B of the brake switch 16 becomes a logical value "1" accordingly. To the step, and when the pulse motor operation amount calculated in the step at that time is on the speed increasing side,
The process directly shifts to step without performing step and shift control, waits for a predetermined time τ, and then returns to step.

As described above, when the brake pedal is depressed while the vehicle is traveling to shift to the braking state, the driving of the pulse motor 12 to the speed increasing side is prohibited. Therefore, as shown by the symbol a in FIG. 6, the power rollers 4 and 5 of the continuously variable transmission T are in contact with the intermediate positions of the input disk 2 and the output disk 3, respectively, so that the power transmission is approximately the third speed of the automatic transmission. Assuming that the gear is in the corresponding shift position, depressing the brake pedal prohibits the shift operation to the speed-increasing side.
The gear ratio is fixed, which causes the engine brake to act, which causes the vehicle speed to decrease and the engine speed to decrease accordingly.

Then, the operation amount of the pulse motor 12 calculated in step at the point b where the throttle opening becomes “0” is the power roller 4,
Since the value is such that 5 is tilted to the deceleration side, the process moves from step to step and the pulse motor 12 is driven to tilt the power rollers 4 and 5 to the maximum deceleration position side. After that, when the power rollers 4 and 5 reach the maximum deceleration position, the maximum deceleration position detector 20D is turned on, the process moves from step to step, the drive of the pulse motor 12 is stopped, and this maximum deceleration position is maintained. To do.

On the other hand, when the brake pedal is released and the accelerator pedal is depressed again to shift to the acceleration state at the time point indicated by reference character c in FIG. 6 in the braking state where the gear ratio is fixed, Since the throttle opening becomes large, the target operation amount Ln calculated at the step becomes small according to the acceleration state, the operation amount of the pulse motor 12 calculated at the step becomes the deceleration side, and the braking detection of the brake switch 16 is made. Since the signal has the logical value "0", the process moves from step to step, and the pulse motor 12 is driven to the deceleration side to drive the power roller 4,
5 is tilted to the deceleration side, the drive torque is increased to shift to the acceleration state, and then the power rollers 4 and 5 are tilted to the acceleration side as the vehicle speed increases.

When shifting from this braking state to the acceleration state, tilting of the power rollers 4 and 5 to the acceleration side is prohibited, so the kick dow amount for shifting to the acceleration state is reduced, and the responsiveness is improved accordingly. Can be improved.

In the above embodiment, the case where the upper limit value selection means 24 selects the upper limit value with the upper limit value setting switches 19U, 19D has been described, but the present invention is not limited to this, and the variable resistor, the rotary switch, etc. The selection mechanism of can be applied, and when these are applied, when the shift mechanism SM is shifted to the limit range “L” during urban driving, the upper limit value Li is immediately set to the previous set value. Since it is set, sudden engine braking may act, and in order to avoid this, when shifting to the limit range "L",
It is preferable to once set the upper limit value Li to a predetermined set value on the speed increasing side and then change it to the upper limit value Li selected by the selection mechanism.

Further, although the case where the brake switch is applied as the braking detection means has been described, the present invention is not limited to this, and a pressure sensor that detects the pressure of the master cylinder interlocked with the brake pedal can also be applied. It is only necessary to be able to detect the braking state due to the depression of the brake pedal.

Further, in the above embodiment, the case where the power rollers 4 and 5 of the toroidal type continuously variable transmission T are tilted by using the spool valve and the pulse motor has been described, but a DC motor is applied instead of the pulse motor. In this case, the rotation speed of the DC motor can be detected by a speed detector such as a tacho generator, and this can be compared with the rotation speed command value to control the rotation speed according to the operation amount. In addition, a screw is applied instead of the spool valve, and this is rotatably driven by a pulse motor or a DC motor to form a trunnion.
You may move 6,7.

Further, in place of the spool valve and the pulse motor, a directional control valve for controlling the working fluid for the hydraulic cylinders 9a to 9d of the toroidal type continuously variable transmission T is provided, and a tilting position for detecting the rotational positions of the trunnions 6 and 7 is provided. A turning angle detector may be provided, and the control device C may perform closed loop control of the directional control valve based on a detection signal from the tilting angle detector.

〔The invention's effect〕

As described above, according to the present invention, the shift mechanism is provided with a limit range capable of setting at least the upper limit value of the shift to the speed increasing side, and when shifting to this limit range, the speed increasing side upper limit position is arbitrarily set. Since the shift range is limited between the maximum deceleration position and the speed increasing side upper limit position, the engine braking on the downhill can be effectively applied and a sharp curve can be achieved. It is possible to improve responsiveness during acceleration at the end of cornering while maintaining cornering characteristics on consecutive uphill slopes, and it is also possible to select the optimum gear ratio range according to traffic conditions. Is obtained.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram showing an outline of the present invention, FIG. 2 is a schematic configuration diagram showing a first embodiment of the present invention, and FIG. 3 is a block diagram showing an example of a control device applicable to the present invention. FIG. 4 is a flowchart showing the processing procedure of the control device, and FIGS. 5 and 6 are graphs showing the relationship between the vehicle speed and the engine speed, respectively, using the shift position as a parameter for explaining the operation of the present invention. 1 ... Housing, 2 ... Input disc, 3 ... Output disc, 4,5 ... Power roller, 6,7 ... Trunnion, T
...... Toroidal type continuously variable transmission, C …… Control device, 10 ……
Spool control valve, 11 …… Precess cam, 12 …… Pulse motor, 14 …… Vehicle speed detector, 15 …… Throttle opening detector, 16 …… Brake switch, 18 …… Shift position detector, SM …… Shift mechanism , 19U, 19D …… Upper limit value setting switch, 21 …… Input amplifier, 22 …… Shift operation amount selection means, 23
...... Limit range determination means, 24 ...... Upper limit value selection means, 25 ...
... upper limit correction means, 26 ... control means, 27 ... prohibition means,
28 …… Microcomputer, 29 …… Pulse distribution circuit,
30 ... Interface circuit, 31 ... Arithmetic processing unit, 32 ...
…Storage device.

Claims (1)

[Claims] 1. A toroidal type continuously variable vehicle for performing a gear shifting operation by operating a toroidal type continuously variable transmission based on gear shift control information from gear shift control information detecting means for detecting gear shift control information such as a throttle opening command signal. In a shift control device for a transmission, a shift operation amount selecting means for selecting a shift operation amount based on the shift control information, and a shift position detecting means for detecting a shift position of a shift mechanism including at least a limiting range for limiting a speed increasing side shift position. A position detector, a limiting range determining means for determining whether or not the shift mechanism is in a limiting range based on a detection signal of the shift position detector, and a determination result of the limiting range determining means is in the limiting range. An upper limit value selecting means for arbitrarily selecting an upper limit value on the speed increasing side, an upper limit value selected by the upper limit value selecting means, and a shift operation amount selected by the shift operation amount selecting means. And an upper limit value correction unit that corrects the shift operation amount to be equal to or less than the upper limit value, and a control unit that controls the toroidal type continuously variable transmission based on the corrected shift operation amount from the upper limit value correction unit. A shift control device for a toroidal continuously variable transmission for a vehicle, which is characterized in that