JPH09203450A - Electromagnetic solenoid control device and toroidal type continuously variable transmission used it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To driving-control the position of a sleeve delicately by setting the half of front and rear even number values of odd number values as respective duty control values, outputting a set duty setting value alternately, and duty driving-controlling an electromagnetic solenoid. SOLUTION: When an integer n is an odd number, an output signal duty corresponding to (n+1)/2 and an output signal duty B corresponding to (n-1)/2 are decided (Step 6), and the output signal duty A and the output signal duty B are alternately outputted to an electromagnetic solenoid for operating a solenoid valve (Steps 7, 8). It is returned to a main control routine (Step 9). The position of the sleeve is controlled with high resolution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic solenoid control device and a toroidal type continuously variable transmission using the same.

[0002]

2. Description of the Related Art Generally, a toroidal type continuously variable transmission includes a toroidal transmission unit 1 as shown in FIG. The toroidal transmission unit 1 of the toroidal type continuously variable transmission continuously rotates the input disk 2 in response to a change in the tilt angle with respect to the input disk 2 and the output disk 3, and the disks 2 and 3, which are arranged to face each other. A pair of power rollers 4 (only one of which is shown) that changes speed and transmits to the output disk 3, and a pair of trunnions 6 (only one of which supports the power roller 4 rotatably and can be tilted about a tilt shaft 5). (Illustration).

Normally, the trunnion 6 is in the neutral position at a certain gear ratio. That is, the trunnion 6 is at a position where the rotation center line A-A of the input disk 2 and the output disc 3 and the rotation center line BB of the power roller 4 intersect (= neutral position).
It is in. Gear shifting is performed by displacing the trunnion 6 from the neutral position in the axial direction of the tilt shaft 5. When the trunnion 6 is displaced in the tilt axis direction, the trunnion 6 is tilted around the tilt axis 5 in a direction and at a speed corresponding to the displacement direction and the displacement amount, and the trunnion 6 is moved to the input disk 2 and the power roller 4. Radius drawn by the contact points of the output disk 3 and the power roller 4
Gear shifting is performed by changing the ratio with the radius drawn by the contact point with.

In the toroidal type continuously variable transmission, for example, the tilting drive of the power roller 4 is performed by the control valve 10.
The control valve 10 is driven by an electromagnetic solenoid control device, and various types are known in the related art. For example, as shown in FIG. 2, the control valve 10 is slidably arranged in a hole formed in the valve case 12. A sleeve 11, a spool 13 slidably inserted into the sleeve 11, a recess cam 18 that displaces the spool 13 in the axial direction by moving integrally with the trunnion 6, and a relative displacement between the spool 13 and the sleeve 11 in the axial direction. As a result, the hydraulic pressure is supplied or discharged to displace the trunnion 6 in the tilt axis 5 direction, the hydraulic cylinder 8 and the solenoid valve 21 and solenoid valve 21 which are operated to supply hydraulic oil for axially displacing the sleeve 11. In order to operate, the electromagnetic solenoid 19 for electromagnetically driving the solenoid valve 21 and a control signal according to the target gear ratio are sent to the electromagnetic solenoid 19. It is equipped with a controller 20.

The spool 13 is slidably arranged in the sleeve 11, and a return spring 16 is provided between the sleeve 11 and the spool 13. The return spring 16 is in contact with one end of the spool 13, the spool 13 is biased to the right by a spring force, and the other end of the spool 13 is in contact with one end of a lever 17 pivotally attached to the other end of the lever 17. Is in contact with a precess cam 18 attached to the tip of the tilting shaft 5. Therefore, the spool 13
The trunnion 6 is displaced in the axial direction of the tilt shaft 5, or is displaced in the axial direction by rotating around the tilt shaft 5.

The electromagnetic solenoid 19 electromagnetically drives the solenoid valve 21, and the opening / closing drive of the solenoid valve 21 controls the magnitude of the hydraulic pressure acting on the end portion of the sleeve 11.
The solenoid valve 21 controls the magnitude of the pressure Ps acting on the left end of the sleeve 11 based on the output signal from the controller 20. The spool 13 is connected to a trunnion 6 supporting the power roller 4 via a precess cam 18,
It is held at a position corresponding to the combined value of the tilt angle of the trunnion 6 and the displacement in the direction of the tilt shaft 5. The solenoid valve 21 is
The pressure Ps acting on the left end of the sleeve 11 is output based on a signal from the controller 20, the sleeve 11 is pushed rightward by the action of the pressure Ps, and the sleeve 11 is pushed leftward by the return spring 15 to 11
The sleeve 11 is controlled at a position where the forces applied to the parts are balanced. Therefore, when hydraulic pressure acts on the left end of the sleeve 11 via the solenoid valve 21 driven by the electromagnetic solenoid 19, the sleeve 11 causes the hydraulic pressure Ps and the return spring 15 to move.
Move to a position where the forces of are balanced.

In the electromagnetic solenoid control device for the control valve 10, the controller 20 sends an output signal to the electromagnetic solenoid 19 of the solenoid valve 21 according to the target gear ratio. That is, as shown in the process flow chart of FIG. 3, the electromagnetic solenoid control is started, and the target gear ratio e ₀ is calculated based on the gear shift information in the main routine (step 21). When the target gear ratio e ₀ is calculated, the controller 20 calculates the duty according to the calculated target gear ratio e ₀ (step 22). When the duty is calculated,
The calculated duty is output to the solenoid valve 19 (step 23). Next, the electromagnetic solenoid control returns to the start of the main routine again (step 24).

Next, the operation of the toroidal type continuously variable transmission during shifting will be described. Hereinafter, the case of shifting to the deceleration side will be described with reference to FIG. (1) Signal from controller 20 causes solenoid valve 19
Is actuated, the pressure Ps acts on the left end of the sleeve 11 through the conduit 14, and the sleeve 11 moves to the right of the state of FIG. The relative position between the sleeve 11 and the spool 13 changes, the communication path between the Pd circuit and the PL circuit is opened, and the line pressure PL is supplied from the hydraulic pressure source to the deceleration side cylinder chamber 8b through the conduit 9b. The communication path with the drain circuit is opened, and the hydraulic pressure in the acceleration side cylinder chamber 8a is drained to the tank through the pipe line 9a. As a result, (Pd circuit hydraulic pressure)> (Pu circuit hydraulic pressure), and the trunnion 6 moves downward. Offset. At this time, the power roller 4 starts tilting in the direction of arrow down about the tilting shaft 5 by the side slip force. (2) As the power roller 4 tilts, the spool 1
3 is shifted to the right in FIG. 2 by a combined value of the displacement of the power roller 4 in the tilt axis direction and the tilt angle, and the communication path between the Pd circuit and the PL circuit and the communication path between the Pu circuit and the drain circuit are reduced. Then, when the relative position between the sleeve 11 and the spool 13 is in the neutral state, Pd and Pu become equal. (3) However, since the power roller 4 is still offset in the tilt axis direction in the above state, the power roller 4 continues tilting due to the side slip force. As a result, the spool 13 moves to the right of the neutral position with respect to the sleeve 11, and conversely, the communication passage between the Pd circuit and the drain and the communication passage between the Pu circuit and the PL circuit are opened, (the hydraulic pressure of the Pd circuit) < (P
(the hydraulic pressure of the u circuit), the trunnion 6 is displaced upward, the displacement in the tilt axis direction of the power roller 4 is reduced, and the side slip force is weakened accordingly, and the tilt speed is reduced. (4) As the trunnion 6 reciprocates up and down about the neutral position, the amplitude becomes smaller, the displacement of the power roller 4 in the tilt axis direction is zero, and the position of the spool 13 is neutral with respect to the sleeve 11. The shift ends when is reached.

Conventionally, there is a linear pulse motor disclosed in Japanese Patent Application Laid-Open No. 63-11058 which increases the resolution. The linear pulse motor increases the operating resolution of the scale by mounting the fine movement mechanism in two stages on the scale. In addition, Japanese Unexamined Patent Publication
In the hydraulic control device for an automatic transmission disclosed in Japanese Patent Laid-Open No. 21063, while the clutch mechanism is operating, the pressure reducing means reduces the hydraulic pressure to a low set value, and the duty is controlled to adjust the clutch pressure. After the operation is completed, the hydraulic shock is reduced to reduce the shift shock.
Furthermore, the variable displacement pump / motor displacement control device disclosed in Japanese Utility Model Laid-Open No. 2-131091 enables high-speed control and high resolution of the variable displacement pump at the same time.

[0010]

However, in the toroidal type continuously variable transmission described above, the resolution of the gear ratio depends on the resolution of the signal output to the solenoid valve 21, but the device that outputs this signal, that is, the solenoid. The valve drive circuit is
A PWM control circuit is generally used because of its high reliability and low cost. However, general P
Since the resolution of the WM control circuit is about 1/100, the resolution of the gear ratio is limited to 1/100 or less, and finer shift control cannot be performed. Further, a PWM (pulse width modulation) control circuit with higher resolution is also known, but the PWM control circuit becomes expensive and the PW
The advantages of M control are diminished.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, even though the output signal from the solenoid valve drive circuit corresponding to a certain target gear ratio does not change with time. On the other hand, by changing the output signal from the solenoid valve drive circuit at a ratio corresponding to the target gear ratio, an electromagnetic solenoid control device that drives the solenoid valve with a resolution exceeding the resolution of the solenoid valve drive circuit is provided. Solenoid controller has a resolution of 1
An object of the present invention is to provide a toroidal type continuously variable transmission that can control a gear ratio with a higher resolution by using an inexpensive one of about / 100.

According to the present invention, in an electromagnetic solenoid control device for duty controlling an electromagnetic solenoid for operating a solenoid valve, an integer value from zero to twice the resolution of the electromagnetic solenoid is selected as a maximum value in accordance with a target control value, If the selected integer value is an even value, one half of the even value is output as the duty control value. If the selected integer value is an odd value, the even value before and after the odd value is output. One half is set as the duty control value, and 2 is set.
The present invention relates to an electromagnetic solenoid control device which alternately outputs two duty control values to control the duty of the electromagnetic solenoid.

Further, according to the present invention, the input disc and the output disc which are arranged to face each other, and the rotation of the input disc is steplessly changed according to the change of the tilt angle with respect to the both discs and transmitted to the output disc. Power roller,
The trunnion rotatably supporting the power roller and displaceable in the tilt axis direction, the hydraulic cylinder for displacing the trunnion in the tilt axis direction, the control valve for controlling the hydraulic pressure to the hydraulic cylinder, and the control valve are provided. The electromagnetic valve in the electromagnetic solenoid control device according to claim 1, further comprising a sleeve that sets a gear ratio, and a solenoid valve that is operated to supply hydraulic oil that displaces the sleeve to the control valve. The present invention relates to a toroidal type continuously variable transmission that is operated by the output of a solenoid.

Since the electromagnetic solenoid control device according to the present invention is constructed as described above, it is equivalent to using an electromagnetic solenoid having a high resolution by switching the output signal by the controller while using an electromagnetic solenoid having a low resolution. The effect of can be secured. Also,
In this toroidal type continuously variable transmission, the solenoid valve for controlling the supply of hydraulic oil is used by using the electromagnetic solenoid control device, and therefore, the inexpensive electromagnetic solenoid control device having a resolution of about 1/100 is used to change the gear ratio with a high resolution. Can be controlled.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electromagnetic solenoid control device according to the present invention and a toroidal type continuously variable transmission to which the same is applied will be described below with reference to the drawings. FIG. 1 is a process flow chart showing an embodiment of an electromagnetic solenoid control device.

The electromagnetic solenoid control device according to the present invention controls the duty control of the electromagnetic solenoid 19, and selects and selects an integer value from zero to twice the resolution of the electromagnetic solenoid 19 as the maximum value from the target control value. If the integer value is an even value, the half of the even value is duty
If the selected integer value is an odd value, one half of the even value before and after the odd value is set as the duty control value, and the set two du values are output.
The ty control value is alternately output and the electromagnetic solenoid 19 is du
ty drive control is performed.

Further, this electromagnetic solenoid control device can be applied to drive the solenoid valve 21 in the toroidal type continuously variable transmission shown in FIG. This toroidal-type continuously variable transmission continuously changes the rotation of the input disk 2 in response to changes in the tilt angle with respect to the input disk 2 and the output disk 3, and the disks 2 and 3 that are arranged opposite to each other, and outputs the rotation. The power roller 4 transmitted to the disk 3, the trunnion 6 rotatably supporting the power roller 4 in the tilting shaft 5 direction, and the hydraulic cylinder 8 for moving the piston 7 to displace the trunnion 6 in the tilting shaft 5 direction. (8a, 8b),
A control valve 10 that controls the hydraulic pressure to the hydraulic cylinder 8 and a solenoid valve 21 that is operated to supply hydraulic oil that displaces the control valve 10 to the control valve 10 are provided, and the solenoid valve 21 is controlled by the output of the electromagnetic solenoid 19. It is operated.

The operation of this electromagnetic solenoid controller will be described with reference to FIG. The electromagnetic solenoid control device of this embodiment is an embodiment applied to the electromagnetic solenoid 19 in a toroidal type continuously variable transmission, and has a resolution of 1 /
Resolution is 1/20 in 100 solenoid drive circuit
The gear ratio is controlled with a resolution equivalent to zero. When the target gear ratio e0 is determined by the vehicle speed, accelerator opening, engine speed, etc. in the main control routine (step 1), the controller 20 obtains an integer n from 0 to 200 according to the target gear ratio e0 (step 2). . Then, it is determined whether the integer n is even or odd (step 3),
If the integer n is an even number, the output signal duty corresponding to n / 2 is determined (step 4), and the output signal dut is determined.
y is output to the electromagnetic solenoid 19 which operates the solenoid valve 21 (step 5). Then, the process returns to the main control routine (step 9).

In the processing of step 3, the integer n
Is an odd number, the output signal dutyA corresponding to (n + 1) / 2 and the output signal d corresponding to (n-1) / 2
utyB is determined respectively (step 6), and the output signals dutyA and dutyB are alternately output to the electromagnetic solenoid 19 which operates the solenoid valve 21 (step 7,
8). Then, the process returns to the main control routine (step 9). Here, d of the output signals dutyA and dutyB
If the duty cycle is 20 msec, the first 20 mse
c is dutyA, and the next 20 msec is dutyB. Accordingly, the output pressure P of the solenoid valve 21 is also
Output pressure PA and PB are repeated every 20 msec.
The average output pressure during 0 msec becomes an intermediate pressure between PA and PB, that is, (PA + PB) / 2, and the position of the sleeve 11 is also controlled to an intermediate position between the positions corresponding to the output signals dutyA and dutyB.

As described above, this electromagnetic solenoid control device is equivalent to controlling the position of the sleeve 11 at a resolution of 1/200 with the drive circuit of the solenoid valve 21 having a resolution of 1/100. The control resolution of the gear ratio of the toroidal type continuously variable transmission can be controlled with a resolution of 1/200 which is higher.

[0021]

The electromagnetic solenoid control device according to the present invention and the toroidal type continuously variable transmission using the same have the following effects because they are configured as described above. That is, as described above, this electromagnetic solenoid control device duts half of the selected integer value to an even value.
y control value, and when it is an odd value, half of the even value before and after it is alternately output as the duty control value, and the electromagnetic solenoid is drive-controlled, so that the resolution is 1
Even if an inexpensive electromagnetic solenoid of about / 100 is used, it is possible to perform fine control with high accuracy equivalent to that when an electromagnetic solenoid having a higher resolution is used. Therefore, when this electromagnetic solenoid control device is applied to the electromagnetic solenoid that drives the solenoid valve that controls the sleeve in the toroidal type continuously variable transmission, the position of the sleeve that sets the gear ratio can be more finely controlled. Therefore, the gear ratio can be finely and precisely controlled, and the cost of the toroidal-type continuously variable transmission itself can be reduced.

[Brief description of drawings]

FIG. 1 is a process flow chart showing an embodiment of the operation of a toroidal type continuously variable transmission according to the present invention.

FIG. 2 is a schematic explanatory view showing a hydraulic control device in this toroidal type continuously variable transmission.

FIG. 3 is a process flow chart showing an operation of a conventional electromagnetic solenoid control device.

[Explanation of symbols]

 2 Input Disc 3 Output Disc 4 Power Roller 5 Tilt Shaft 6 Trunnion 8 Hydraulic Cylinder 10 Control Valve 11 Sleeve 19 Electromagnetic Solenoid 20 Controller 21 Solenoid Valve

Claims (2)

[Claims] 1. An electromagnetic solenoid control device for controlling the duty of an electromagnetic solenoid that operates a solenoid valve,
Depending on the target control value, an integer value from zero to twice the resolution of the electromagnetic solenoid is selected as the maximum value, and if the selected integer value is an even value, one half of the even value is used as the duty control value. If the selected integer value is an odd value, one half of the even value before and after the odd value is set as the duty control value, and the set two duts are output.
The y control value is alternately output to dut the electromagnetic solenoid.
An electromagnetic solenoid control device characterized by y-drive control. 2. An input disc and an output disc, which are arranged to face each other, and a power roller for transmitting the rotation of the input disc to the output disc by steplessly changing the rotation of the input disc in accordance with a change of a tilt angle with respect to the both discs. The trunnion rotatably supporting the power roller and displaceable in the tilt axis direction, the hydraulic cylinder for displacing the trunnion in the tilt axis direction, the control valve for controlling the hydraulic pressure to the hydraulic cylinder, and the control valve are provided. The electromagnetic valve in the electromagnetic solenoid control device according to claim 1, further comprising a sleeve that sets a gear ratio, and a solenoid valve that is operated to supply hydraulic oil that displaces the sleeve to the control valve. A toroidal type continuously variable transmission that is operated by the output of a solenoid.