JPH0613260B2 - Controller for continuously variable transmission - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a control device for a continuously variable transmission.

(B) Conventional Technology As a conventional control device for a continuously variable transmission, for example, Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent Publication No. 8-180867. That is, in the case of a control device that operates the shift motor by the shift command signal to control the gear ratio, when noise is input to the signal and an error occurs, the error is accumulated and the shift command signal and the actual rotational position of the shift motor are increased. To prevent this, the gear shift reference switch detects that the gear shift motor has reached a predetermined rotational position, and when the gear shift reference switch operates, the gear shift command is always issued by the operation signal. It is configured to reset the signal to a state corresponding to the rotational position of the variable speed motor. This allows
Accumulation of errors can be prevented.

(C) Problems to be solved by the invention For example, when the power supply of the vehicle is turned on and the set value is set, if the shift reference switch is already turned on, the shift motor at that time is set. The position is set as the reference position. However, since there is a width in the area where the gear shift reference switch is on, it is unknown whether the gear shift motor is at a predetermined position (the position where the gear shift reference switch is switched from off to on). There is an error in the default position. The present invention aims to solve the above problems.

(D) Means for Solving the Problems In the present invention, when the gear shift actuator has already moved to the signal calibration position, the gear shift actuator is operated once until the gear shift reference position sensor switches. By making the setting, the above problem is solved. That is, the control device for a continuously variable transmission according to the present invention detects a shift reference position sensor for detecting that the shift actuator is in a predetermined signal calibration position, and a shift command signal (that is, a shift command signal based on a signal from the shift reference position sensor). , A signal calibrating means for calibrating the signal indicating the operating state of the speed change actuator) to a state corresponding to the signal calibration position,
When the vehicle speed sensor for detecting the speed of the vehicle and the computer including at least the time when the power source of the vehicle is turned on is reset and the vehicle speed indicated by the signal from the vehicle speed sensor is equal to or less than a predetermined value. Initial setting means for forcibly operating the shift actuator to the signal calibration position, and when the shift reference position sensor detects that the shift actuator is already in the signal calibration position when the initial setting means starts operating. Has a resetting means for moving the shift actuator once outside the signal calibration position and then again to the signal calibration position.

(E) Action When the condition for the initial setting is satisfied, and the gear shift actuator is already in the signal calibration position, the gear shift actuator is operated by the resetting means until the gear shift reference position sensor is switched. Then, the shift actuator moves toward the signal calibration position, and when the shift actuator enters the signal calibration position, the signal calibration position is activated and signal calibration is performed. This ensures that the state of the signal with respect to the position of the shift actuator is accurately calibrated.

(F) Embodiment FIG. 2 shows a power transmission mechanism of a continuously variable transmission whose speed is controlled by the control device of the present invention. In this continuously variable transmission, by engaging the forward clutch 4 or the reverse clutch 24, the rotation of the input shaft 2 is driven by the drive pulley 6, the V-belt 50,
It can be transmitted to the output shafts 76 and 78 via the driven pulley 51 and the like. This continuously variable transmission includes an input shaft 2, a forward clutch 4, a drive pulley 6, a drive shaft 8 and an oil pump 1.
0, drive gear 12, driven gear 14, rotary wheel 16, oil sump 18, pitot tube 20, counter shaft 22, reverse clutch 2
4, gears 26, 28, 30, 32 and 34, piston chambers 36 and 38, fixed conical plate 40, drive pulley cylinder chamber 42, movable conical plate 44, rotating trough 46, oil sump 4
7, Pitot tube 48, V-belt 50, driven pulley 51, driven shaft 52, fixed conical plate 54, driven pulley cylinder chamber 5
6, a spring 57, a movable conical plate 58, a gear 60, a ring gear 62, a differential case 64, pinion gears 66 and 68, a differential device 70, side gears 72 and 74, and output shafts 76 and 78, Detailed description of these is omitted. Regarding the structure of the part of which description is omitted, Japanese Patent Laid-Open No.
-75840 "Hydraulic automatic clutch control device"
It is described in.

FIG. 3 shows a hydraulic control device for a continuously variable transmission. The hydraulic control device for a continuously variable transmission includes an oil pump 10, a line pressure regulating valve 102, a manual valve 104, a shift control valve 106,
Clutch complete engagement control valve 108, speed change motor (step motor) 110 (speed change actuator), speed change control mechanism 112, throttle valve 114, starting valve 11
6, start adjustment valve 118, maximum gear ratio holding valve 120,
It has a reverse inhibitor valve 122, a lubrication valve 124, a tank 130, etc., which are connected to each other as shown in the drawing, and also the piston chamber 3 of the forward clutch 4.
6, the piston chamber 38 of the reverse clutch 24, the drive pulley cylinder chamber 42, the driven pulley cylinder chamber 56, and the Pitot tubes 20 and 48 are also connected. Detailed description of these valves and the like will be omitted. The parts of which description is omitted are described in the above-mentioned Japanese Patent Laid-Open No. 59-75840.

FIG. 4 shows a step motor 110 (shift actuator).
3 shows a shift control device 300 that controls the operation of the force motor 224. The shift control device 300 includes an input interface 311, a CPU (central processing unit) 313, a reference pulse generator 312, and a ROM (read only memory) 3.
14, a RAM (random access memory) 315, a non-volatile memory 322, and an output interface 316, which are connected by an address bus 319 and a data bus 320.
Reference numeral 0 indicates an engine speed sensor 301, a vehicle speed sensor 302, a throttle opening sensor 303, a shift position switch 304, a shift reference switch 298 (shift reference position sensor), an engine cooling water temperature sensor 306,
The signals from the brake sensor 307 and the start pressure detection pressure sensor 321 are input to the step motor 110.
Also, signals are output to the force motor 224, but detailed description thereof will be omitted. Note that the configuration of the part of which description is omitted is described in the above-mentioned Japanese Patent Laid-Open No. 59-758.
No. 40 publication.

FIG. 5 shows the initialization routine 1000. The initialization routine 1000 is executed prior to the force motor control routine 500 shown in FIG. 6, the complete engagement control routine 600 shown in FIG. 7, and the step motor control routine 700 shown in FIG. First, it is determined whether the initial flag Fi is set (step 1002). The initial flag Fi is cleared at the time of starting with the ignition switch turned on. When the initial flag Fi is not set, the vehicle speed V is read (1004 in the same figure), and then the read vehicle speed V is read.
Is below a predetermined small vehicle speed value V _A (for example, 10 km / h) (1006), and if V ≦ V _A , it is determined whether the shift reference switch 298 is ON ( Ibid. 1008). When the shift reference switch 298 is off, the step motor drive signal is moved in the downshift direction (step 1010). Then down flag Fd
Is set (step 1012) and a step motor drive signal is output (step 1014). As a result, the step motor 11
When the gear ratio is 0, the gear ratio rotates in the larger direction. When the shift reference switch 298 is turned on by the rotation of the step motor 110, steps 1008 to 1016 are performed.
Then, it is determined whether or not the down flag Fd is set, and if it is set, the initial flag Fi is set in step 1018. After step 1018, the routine proceeds to step 501 of the force motor control routine 500 shown in FIG. The gear shift reference switch 298 is on from the beginning, and steps 1008 to 1
If the down flag Fd is not set when proceeding to 016, the step motor drive signal is moved in the upshift direction (at step 1020), and the step motor 110 is once moved to a position where the shift reference switch 298 is turned off. After setting the down flag Fd in step 1012, the process proceeds to step 1018 in the same manner as described above. Therefore, the initial flag Fi is set at the position where the shift reference switch 298 is turned from ON to OFF, and step 501
We will proceed below.

When the initial flag Fi is set, the routine proceeds from step 1002 directly to step 501 from the next routine.

If V> V _A when the process proceeds to step 1006 before the initial flag Fi is set, the initial flag Fi is immediately set at step 1018, and the process proceeds to step 501. Therefore, even if the initial flag Fi is cleared due to an improper operation, noise, or the like while traveling at a vehicle speed of _VA or higher, it is prevented from proceeding from step 1006 to step 1008 and thereafter. That is, the stepping motor 110 is not driven for initialization.

Following the initialization routine 1000, a force motor control routine 500 shown in FIG. 6 and a complete engagement control routine 600 shown in FIG. 7 are executed, which are the same as those in the above-mentioned JP-A-59-75840. Therefore, detailed description will be omitted.

Following the complete engagement control routine 600, the step motor control routine 700 shown in FIG. 8 is executed. In the above-described initial setting routine 1000, the process first proceeds to step 1008 → step 1016 → step 1018 when the shift reference switch 298 is off in the previous routine and the shift reference switch 298 is turned on in this routine ( That is, when the stepping motor 110 reaches the rotational position where the shift reference switch 298, which is the signal calibration position, is turned on). In this case, in the step motor control routine 700, step 77
8 → step 779 → step 780 or step 7
The sequence proceeds from 13 → step 715 → step 717, and the pulse number N _A of the step motor 110 is always set to zero.
The pulse number N _A corresponds to the rotational position of the step motor 110, and N _A = 0 corresponds to when the step motor 110 is at the signal calibration position. That is, the signal of the step motor 110 is calibrated. Since the contents of the step motor control routine 700 are the same as those in the above-mentioned Japanese Patent Laid-Open No. 59-75840, except for the following points, further description will be omitted. The difference from the one disclosed in the above publication is that the actual pulse number N _A is stored in the non-volatile memory 322. As a result, even when the power supply is temporarily turned off, the data of the pulse number N _A immediately before the power supply is turned off is taken out, so that the rotational position of the step motor 110 is not changed. Does not happen.

When the shift reference switch 298 is already turned on when the condition for the initial setting is performed as described above, the step motor drive signal is moved in the upshift direction, and the step motor 110 is once turned off. Move to the position (step 1008 → 1016 →
1020), followed by initialization. As a result, the initial flag Fi is set at the position where the shift reference switch 298 is changed from OFF to ON, and the step motor 110
The signal is calibrated. Therefore, the initial setting is always performed at the position where the gear shift reference switch 298 is turned from OFF to ON, and the other gear shift reference switch 298 is not performed at the ON position. Therefore, an error occurs at the time of the initial setting. The occurrence of such a problem is prevented.

(G) Effect of the Invention As described above, according to the present invention, when the shift actuator is already in the signal calibration position when the conditions for initial setting are reached, once the shift actuator is moved out of the signal calibration position. Since it is moved and then moved to the signal calibration position again, it is possible to reliably prevent the occurrence of an error at the time of initialization.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between components of the present invention, FIG. 2 is a sectional view of a V-belt type continuously variable transmission, FIG. 3 is a diagram showing an entire control device of the continuously variable transmission, and FIG. Shows a shift control device, FIG. 5 shows an initial setting routine, FIG. 6 shows a force motor control routine, FIG. 7 shows a complete engagement control routine, and FIG. 8 shows a step motor control. It is a figure which shows a routine. 110 ... Step motor (shift actuator), 29
8 ... Shift reference switch (shift reference position sensor), 30
2 ... Vehicle speed sensor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihisa Anbo 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Masaki Nakano 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A control device for a continuously variable transmission, comprising: a gear shift actuator that operates in response to a predetermined gear shift command signal from a computer; and a gear ratio that is continuously controlled according to an operating state of the gear shift actuator. A gear shift reference position sensor that detects that the actuator is at a predetermined signal calibration position, and signal calibration means that calibrates the gear shift command signal to a state corresponding to the signal calibration position based on the signal from the gear shift reference position sensor, When the vehicle speed sensor for detecting the speed of the vehicle and the computer including at least the time when the power source of the vehicle is turned on is reset and the vehicle speed indicating the signal from the vehicle speed sensor is equal to or less than a predetermined value. The initial setting means for forcibly operating the speed change actuator to the signal calibration position and the initial setting means have started operation. If the gear shift reference position sensor detects that the gear shift actuator is already in the signal calibration position at this time, move the gear shift actuator outside the signal calibration position and then move it again to the signal calibration position. A control device for a continuously variable transmission, comprising: setting means;