JPS61291229A - Controller for continuously variable transmission - Google Patents

Abstract

PURPOSE:To prevent the generation of error by carrying out initialization after an actuator for speed change is once operated to the position where a speed- change standard position sensor is switched, when the actuator is already shifted to the signal correcting position. CONSTITUTION:A speed-change standard position sensor C which detects that a speed-change actuator B for controlling the speed change ratio of a continuously variable transmission A is at a prescribed signal correcting position is installed, and the speed-change instruction signal is corrected to the state corresponding to the signal correcting position on the basis of the output of the sensor C in a signal correcting means D. When the car speed on engine start which is detected by a car speed sensor E is below a prescribed value, an initializing means F compulsorily operates the actuator B for speed change to the signal correcting position. When the actuator B for speed change is at the signal correcting position, the actuator B for speed change is once shifted outside the signal correcting position by a resetting means G and shifted again to the signal correcting position.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a control device for a continuously variable transmission.

(b) Conventional technology As a conventional continuously variable transmission control device, for example,
There is one shown in Japanese Patent No. 8-180867. In other words, in the case of a control device that operates a speed change motor using a speed change command signal to control the speed change ratio, if noise is manually applied to the signal and an error occurs, this error is accumulated and the difference between the speed change command signal and the actual rotational position of the speed change motor is To prevent this, a speed change reference switch detects when the speed change motor reaches a predetermined rotational position, and when the speed change reference switch is activated, the speed change command is always issued by the activation signal. The signal is configured to be reset to a state corresponding to the rotational position of the variable speed motor. This results in
Accumulation of errors can be prevented.

(c) Problems to be solved by the invention For example, when the power of the vehicle is turned on and the settings are reset, if the speed change reference switch is already turned on, the speed change motor position at that time is set as the reference position. However, since there is a wide range in which the speed change reference switch is turned on, it is unclear whether the speed change motor is at a predetermined position (the position where the speed change reference switch switches from OFF to ON); This will cause an error in the initial setting position. The present invention aims to solve the above problems.

(d) Means for Solving the Problems In the present invention, if the shift actuator has already moved to the signal calibration position, the shift reference position sensor first operates the shift actuator to the position where it cannot be switched. The above problem is solved by making settings. That is, the control device for a continuously variable transmission according to the present invention includes a shift reference position sensor that detects that the shift actuator is at a predetermined signal calibration position, and a shift command signal (i.e., based on the signal from the shift reference position sensor). , a signal calibrating means for calibrating a signal commanding an operating state of the transmission actuator) to a state corresponding to a signal calibration position, a vehicle speed sensor for detecting the speed of the vehicle, and at least when the vehicle is powered on. Initial setting means for forcibly operating the shift actuator to a signal calibration position when the vehicle speed indicated by the signal from the vehicle speed sensor is less than or equal to a predetermined value under predetermined conditions; and the initial setting means starts operation. If the shift reference position sensor has already detected that the shift actuator is outside the signal calibration position, first move the shift actuator outside the signal calibration position and then move it back to the signal calibration position. and resetting means.

(e) If the shift actuator is already in the signal calibration position when the conditions for performing the initial setting are met, the shift actuator is operated by the resetting means until the shift reference position sensor is switched. Next, the speed change actuator moves in the direction of the signal calibration position, and when the speed change actuator enters the signal calibration position, the signal calibration means is activated and the signal is calibrated. The stiffness allows the state of the signal to be accurately calibrated for the position of the transmission actuator.

(F) Embodiment FIG. 2 shows a power transmission mechanism of a continuously variable transmission whose speed change is controlled by the control device of the present invention. In this continuously variable transmission, the rotation of the human power shaft 2 is controlled by the drive pulley 6, the 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 consists of an input shaft 2, a forward clutch 4, a drive pulley 6, a drive shaft 8, and an oil pump 1.
0, driving gear 12, driven gear 14, rotating groove 16, oil pool 18, pitot tube 20, subshaft 22, reverse clutch 2
4, gears 26.28.3o, 32 and 34, piston chambers 36 and 38, fixed conical plate 40, drive pulley cylinder chamber 42, movable conical plate 44, rotating groove 46, oil pool 4
7, pitot tube 48, belt 50, driven pulley 51, driven shaft 52, fixed conical plate 54, driven pulley cylinder chamber 5
6, spring 57, movable conical plate 58, gear 60, ring gear 62, differential case 64, binion gears 66 and 68, differential device 70, side gears 72 and 74, and output shafts 76 and 78. A detailed explanation will be omitted. The structure of the parts whose explanation is omitted is described in Japanese Patent Application Laid-Open No. 59-1981 filed by the present applicant.
-75840 Publication “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 this continuously variable transmission includes an oil pump 10,
Line pressure regulating valve! 02, manual valve 104, speed change control valve 106, clutch complete engagement control well 108, speed change motor (
step motor) 110 (speed change actuator), speed change control mechanism 112, throttle valve 114, starting valve 116, start adjustment valve 118, maximum speed ratio holding valve 1
20, reverse inhibitor valve 122, lubrication valve 124,
It has a tank 130, etc., which are connected to each other as shown in the figure, and a piston chamber 36 of the forward clutch 4, a piston chamber 38 of the reverse clutch 24, a driving pulley cylinder chamber 42, and a driven pulley cylinder chamber. 56 and also connected to the pitot tubes 20 and 48. A detailed explanation of these valves and the like will be omitted. It should be noted that portions whose explanation is omitted are described in the above-mentioned Japanese Patent Application Laid-Open No. 59-75840.

Step motor 110 (speed change actuator) is shown in Fig. 4.
and a speed change control device 300 that controls the operation of the force motor 224. The speed change 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 nonvolatile memory 322, and an output interface 316, which are connected by an address bus 319 and a data bus 320.
00 includes 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), and an engine coolant temperature sensor 306.
, the signals from the brake sensor 307 and the start pressure detection pressure sensor 321 are input, and the step motor 11
0 and the force motor 224, detailed explanation of these will be omitted. Note that the structure of the parts whose explanation is omitted is described in the above-mentioned Japanese Patent Application Laid-Open No. 59-75.
It is described in Publication No. 840.

FIG. 5 shows an initial setting routine 1000.

Note that this initial setting 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 Fj is set (step 10.02). initial flag Fi
is cleared when starting the engine when the ignition switch is turned on. If the initial flag Fi is not set, the vehicle speed V is read (1004), and then the read vehicle speed V is set to a predetermined small vehicle speed value VA (for example, 10 km).
1006), V
If ≦VA, it is determined whether the shift reference switch 298 is on (step 1008). When the shift reference switch 298 is off, the step motor drive signal is moved in the downshift direction (1010). Next, the down flag Fd is set (1012) and a step motor drive signal is output (1014). This causes the step motor 110 to rotate in a direction with a higher gear ratio. When the speed change reference switch 298 is turned on by the rotation of the step motor 110, the process proceeds from step 1008 to step 1016, where it is determined whether the down flag Fd is set, and if it is set, the initial flag Fi is set at step 1018. Set. After step 1018, the process proceeds to step 501 of the Z ausmotor control routine 500 shown in FIG. Note that if the shift reference switch 298 is on from the beginning and the down flag Fd is not set when proceeding from step 1008 to step 1016, the step motor drive signal is moved in the upshift direction (step 1020). Once the step motor 110 is moved to the position where the speed change reference switch 298 is turned off, the down flag Fd is set to step 1.
After setting at 012, proceed to step 10°1 in the same manner as above.
Proceed to step 8. Therefore, the initial flag Fi is set at the position where the shift reference switch 298 changes from off to on.
The process proceeds to step 501 and subsequent steps.

Once the initial flag Fi is set, the next routine will proceed directly from step 1002 to step 501.

Further, if V>vA when proceeding to step 1006 in a state before the initial flag Fi is set, the initial flag Fi is immediately set in step 1018, and the process proceeds to step 501.

Therefore, even if the initial flag Fi is cleared due to inappropriate operation, noise, etc. while the vehicle is running at a speed higher than V^, the initial flag Fi is cleared from step 1006 to step 1.
Proceeding to 008 and below is prevented. That is, the step motor 110 is not driven for initial setting.

Following the initial setting routine 1000, a force motor control routine 500 shown in FIG. 6 and a complete engagement control routine 600 shown in FIG. Therefore, detailed explanation will be omitted.

Following the complete engagement control routine 600, a step motor control routine 700 shown in FIG. 8 is executed. In the initial setting routine 1000 described above, the process of first proceeding from step 1008 to step 1016 to step 1018 is 1. This is a case where the speed change reference switch 298 was off in the previous routine, and the speed change reference switch 298 was turned on in the current routine (that is, the step motor 110
(This is when the shift reference switch 298, which is the signal calibration position, reaches the rotational position where it is turned on). In this case, in step motor control routine 700, step 7
78→Step 779→Step 780, or Step 713→Step 715→Step 717, and the number of pulses NA of the step motor 110 is always set to 0. The pulse number NA corresponds to the rotational position of the step motor 110, and NA=0 corresponds to when the step motor 110 is in the signal calibration position. That is,
Calibration of the step motor 110 signal is performed. In addition,
Regarding the contents of the step motor control routine 700,
Since it is the same as the above-mentioned Japanese Patent Laid-Open No. 59-75840 except for the following points, further explanation will be omitted. The difference from that described in the above publication is that the actual pulse number NA is stored in the nonvolatile memory 322. As a result, even if the power is temporarily turned off, when the power is turned on, the data of the number of pulses NA immediately before turning off is retrieved, so that fluctuations in the rotational position of the step motor 110 can be prevented. Does not occur.

If the shift reference switch 298 is already on when the condition for performing the initial setting as described above is reached, the step motor drive signal is moved in the upshift direction, and the step motor 110 is once shifted until the shift reference switch 298 is turned off. position (step 1008→1016→
1020), then initialization is performed. As a result, the initial flag Fi is set at the position where the speed change reference switch 298 changes from off to on, and the step motor 110
Calibration of the signal is performed. Therefore, the initial setting is always performed at the position where the shift reference switch 298 changes from off to on, and is never performed at any other position where the shift reference switch 298 is turned on, resulting in an error at the time of initial setting. This will prevent this problem from occurring.

(G) As described in detail, according to the present invention, if the shift actuator is already in the signal calibration position when the conditions for initial setting are met, the shift actuator is once moved outside the signal calibration position. Since the sensor is moved to the position for signal calibration and then moved again to the signal calibration position, it is possible to reliably prevent errors from occurring at the time of initial setting.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between the constituent elements of the present invention, Fig. 2 is a sectional view of a V-belt type continuously variable transmission, Fig. 3 is a diagram showing the entire control device of the continuously variable transmission, and Fig. 4 5 shows the initial setting routine, FIG. 6 shows the force motor control routine, FIG. 7 shows the complete engagement control routine, and FIG. 8 shows the step motor control routine. It is a diagram showing a routine. 110...step motor (speed change actuator),
298...Shift reference switch (shift reference position sensor) 302...Vehicle speed sensor.

Claims (1)

[Scope of Claims] A control device for a continuously variable transmission, which has a speed change actuator operated by a predetermined speed change command signal, and whose speed ratio is continuously controlled according to the operating state of the speed change actuator, comprising: a shift reference position sensor that detects that the vehicle is at a predetermined signal calibration position; a signal calibration means that calibrates a shift command signal to a state corresponding to the signal calibration position based on a signal from the shift reference position sensor; A vehicle speed sensor that detects speed and a shift actuator for signal calibration when the vehicle speed indicated by a signal from the vehicle speed sensor is less than or equal to a predetermined value under predetermined conditions, including at least when the vehicle is powered on. If the shift reference position sensor detects that the shift actuator is already in the signal calibration position when the initial setting means starts operating, the shift actuator is A control device for a continuously variable transmission, comprising a reset means for moving the transmission outside the signal calibration position and then moving it back to the signal calibration position.