JP2583051B2 - Control device for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a control device for a continuously variable transmission for a vehicle, and more particularly, to a control device for a continuously variable transmission capable of selecting and learning an acceleration pattern of a vehicle according to a driver's preference.

[Prior art]

In general, the shift characteristics of the belt-type continuously variable transmission are uniquely determined mechanically by a profile of a shift cam or electronically using a preset table. For example, in the region where the throttle opening is small, the increase in the engine speed is suppressed and the shift is promoted to promote the fuel economy, and in the region where the throttle opening is large, the engine speed is promoted and the output is prioritized. It can be considered. At the time of acceleration, the acceleration, speed, connection time, and the like at each rising point in the acceleration pattern are weighted and set as a manufacturer standard pattern, and optimal acceleration can be performed based on the acceleration pattern. By the way, in the belt-type continuously variable transmission, even if the ideal shift pattern as described above is determined, it does not always match the driving preference of all drivers. Once the shift pattern has been set, there is no room to change it during driver operation. From this,
It is desired to make the shift pattern variable. Therefore, in the related art, regarding a variable speed change pattern in a continuously variable transmission, for example, there is a prior art disclosed in Japanese Patent Application Laid-Open No. Sho 60-14648, and it has been shown that a speed change pattern is selected in relation to the weight of a vehicle. ing. In an automatic transmission, there has been proposed a control device in which a plurality of different shift patterns are stored in each card, and a desired shift pattern can be read from an appropriate card and selected. 179558).

[Problems to be solved by the invention]

Meanwhile, among the above prior arts, the method according to the former technology is based on a method in which the shift range is uniformly shifted to the low speed side or the high speed side in relation to the load weight of the vehicle. In this regard, the driving habit of the driver is not a simple change of the shift range uniformly, and this change cannot adapt to the driver's driving preference. Also, the acceleration pattern was set uniformly, but this also depends on the driver's preference, and one of multiple drivers using the same vehicle cares about acceleration performance,
If another person is concerned about noise or the like, or even if the same driver wants to change the acceleration pattern in accordance with traffic congestion, high-speed driving, or driving on rough roads, he cannot respond to the request. Further, in the method according to the latter technique, although the shift pattern can be selected, since the selected shift pattern is limited to the shift pattern stored in the magnetic guard in advance, the selected shift pattern is limited. The pattern is further adapted to the driver's preferences. For this reason, it is not possible to respond to a request to change the acceleration pattern as in the former technique. Therefore, the present invention provides a control device for a continuously variable transmission that can select an acceleration pattern of a vehicle according to a driver's preference, and can learn and change the selected acceleration pattern to better suit the preference. With the goal.

[Means for solving the problems]

As means for achieving this object, the present invention provides a target gear ratio calculating means for calculating a target gear ratio based on signals from a throttle opening sensor and a secondary pulley rotation speed sensor,
Actual speed ratio calculating means for calculating the actual speed ratio based on signals from the primary pulley speed sensor and the secondary pulley speed sensor, and speed speed calculating for calculating the speed based on a deviation and a coefficient between the target speed ratio and the actual speed ratio. Means for selecting a standard acceleration pattern stored in advance or a learned acceleration pattern learned and stored in accordance with a keyboard input, and said throttle opening. Acceleration determining means for determining when the vehicle is accelerating based on a signal from the sensor; and when the acceleration determining means determines acceleration, the acceleration pattern selected by the acceleration pattern switching means is input, and a coefficient of a shift speed corresponding to the acceleration pattern is calculated. An acceleration pattern calculating means for sequentially calculating and outputting to the shift speed calculating means; and the selected acceleration pattern In the case of the learning acceleration pattern, the operation is turned on / off according to the keyboard input, and at the time of the operation, the acceleration pattern selected by the acceleration pattern switching means is changed according to the keyboard input, and this is changed to the selected learning acceleration pattern. Learning means for storing as

[Action]

According to the control device for a continuously variable transmission having such a configuration, the acceleration pattern switching means selects the standard acceleration pattern or the learning acceleration pattern by keyboard input. Here, when the throttle opening increases, the acceleration determining means determines whether the vehicle is accelerating, and based on this determination, the acceleration pattern calculating means inputs the acceleration pattern selected by the acceleration pattern switching means. Then, the acceleration pattern calculating means sequentially calculates a coefficient of the shift speed according to the input acceleration pattern and outputs the coefficient to the shift speed calculating means. The shifting speed is forced. Here, when the operation of the learning means is turned on by a keyboard input, the learning means changes the acceleration pattern selected by the acceleration pattern switching means in accordance with the keyboard input, and stores this as a learning acceleration pattern.

【Example】

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1, an outline of a transmission system including a belt-type continuously variable transmission to which the present invention is applied will be described. An engine 1 is connected to a main shaft of a belt-type continuously variable transmission 4 via a clutch 2 and a forward / reverse switching device 3. Connect to 5. In the belt-type continuously variable transmission 4, a sub shaft 6 is arranged in parallel with a main shaft 5, a primary pulley 7 is provided on the main shaft 5, and a secondary pulley 8 is provided on the sub shaft 6. Hydraulic cylinder 9,1 on movable side
0 is attached, and the drive belt 11 is wound. Here, of the hydraulic cylinders, the primary cylinder 9
Is set to have a larger pressure receiving area than the secondary cylinder 10, and the primary pressure of the pulley 7,
By changing the ratio of the winding diameter to 8, the speed can be changed continuously. The sub shaft 6 is connected to an output shaft 13 via a set of reduction gears 12, and the output shaft 13 is configured to transmit power to drive wheels 16 via a final gear 14 and a differential gear 15. Next, the hydraulic control system of the belt-type continuously variable transmission 4 will be described.
And a line pressure oil passage 21 on the discharge side of the oil pump 20.
But the second cylinder 10, the line pressure control valve 22, and the shift control valve
23, and from the shift control valve 23 to the primary cylinder 9 via the oil passage 24. The line pressure oil passage 21 further communicates with a regulator 25, and an oil passage 26 with a constant regulator pressure from the regulator 25 communicates with solenoid valves 27 and 28 and a shift control valve 23. Each solenoid valves 27 and 28 discharge pressure turned on, for example, by the duty signal from the control unit 40, and outputs a regulator pressure P _R off,
Such a pulse-like control pressure is generated. The pulse-like control pressure from the solenoid valve 27 is applied to the accumulator 30.
Are averaged and act on the line pressure control valve 22. On the other hand, the control pressure of the pulse from the solenoid valve 28 acts on the shift control valve 23 as it is. In the figure, reference numeral 29 denotes a drain oil passage, 31 denotes an oil pan, and 32 denotes a chalk. Line pressure control valve 22 controls the line pressure P _L for speed ratio by control pressure from the solenoid valve 27. The shift control valve 23 operates between a refueling position connecting the line pressure oil passages 21 and 24 and a draining position draining the line pressure oil passage 24 according to a relationship between the regulator pressure and the control pressure from the solenoid valve 28. . Then, the operation state of the two positions is changed according to the duty ratio to control the flow rate Q of the oil supply or drainage to the primary cylinder 9, and the shift control is performed based on the relationship between the throttle opening and the engine speed. Next, the electronic control system will be described with reference to FIG.
The primary pulley 7, the secondary pulley 8, the rotation speed sensors 41, 42, 43 of the engine 1 and the throttle opening sensor 44,
Further, each signal from the keyboard unit 46 is input to a control unit 40 including a microcomputer. Then, the control unit 40 first inputs the rotation speed signals Np, Ns from the pulley rotation speed sensors 41, 42 to the actual speed ratio calculating means 51 in the speed change speed system, and obtains the actual speed ratio i by i = Np / Ns. Ask for. Further, the rotation speed signal Ns and the signal θ of the throttle opening sensor 44 are input to the target speed ratio calculating means 52, where the target speed ratio is is obtained from a table of Ns−θ based on the speed change pattern. The shift speed calculating means 53 calculates the shift speed di / dt using a predetermined coefficient k and di / dt = k (is-i) based on the actual speed ratio i and the actual speed ratio i. In the case of a negative value, it is input to the duty ratio signal generating means 54 as a signal for performing an upshift. Here, the duty ratio signal generating means 54 outputs the positive or negative shift speed di.
output signal duty ratio D according to / dt
8 to control the actual speed ratio i to gradually approach the target speed ratio is. Next, the line pressure control system will be described. The engine torque calculating means 55 obtains the engine torque T by a map search based on the signals Ne and θ from the engine speed sensor 43 and the throttle opening sensor 44. The required line pressure setting means 56 calculates the required line pressure PLu per unit torque based on the actual gear ratio i, and the target line pressure calculation means 57 calculates the target line pressure PL based on this and the engine torque T. The solenoid valve 27 is driven by the corresponding duty ratio D from the signal generating means 58 to control the line pressure to the target line pressure PL. Next, a learning control system of the acceleration pattern according to the present invention will be described. The acceleration determining means 60 determines acceleration based on the signal θ of the throttle opening sensor 44. At this time, if the learning mode on / off button 46a of the keyboard 46 is set to the normal mode of off, the acceleration pattern calculating means 61 Divides, for example, an acceleration section into a plurality of sections by an acceleration pattern as shown in FIG.
..., speeds a, b, ..., durations at, bt, ..., respectively, are weighted and stored in the RAM memory by the manufacturer's standard acceleration pattern map 62 previously stored in ROM or the like, and in advance by learning. Any one of the plurality of learned acceleration pattern maps 63 is input via an acceleration pattern switching means 64 described later, and the respective durations at, bt,
... acceleration to reach speeds a, b, ...
,... Corresponding to the shift speed di / dt = k (is = i). Based on this, the shift speed calculating means 53
Sets the shift speed di / dt of the acceleration. The learning acceleration pattern map 63 includes identification numbers of a plurality of drivers, and even in the case of one person, traveling in a city, traveling at high speed,
It is prepared as needed for each traveling pattern number such as dirt traveling. Now, the learning mode on / off button 46 of the keyboard section 46
When a is turned on and the driver's identification number and / or traveling pattern number is input from the numeric keypad, the corresponding acceleration pattern map 63
As well as its parameters (rise speed a.
The learning means 65 for rewriting the initial value of the weighting coefficient Wi of the acceleration... Acceleration is performed based on the selected learning acceleration pattern map 63. If the acceleration pattern is close to the driver's preference, the acceleration pattern is stored in the learning acceleration pattern map 63 as it is. On the other hand, when each pattern does not suit the driver's taste and wants a more rapid rise, press the button 46b of the keyboard section 46. learning means 65 by the signal, as shown by the schematic circuit of FIG. 4, the parameters a ,, at, b ,, respectively weighting factor ··· zt W _a1, W _a2, multiplied by the · · · W _z3 By changing the weighting coefficient of each parameter so as to increase or decrease the total 増 減 Wi by a predetermined amount, the stored initial value or previous learning value is rewritten. When this operation is repeated many times, the acceleration pattern in the learning acceleration pattern map 63 converges on the driver's preference. Thereafter, when the learning mode on / off button 46a is turned off with the keyboard unit 46 and a driver identification number or a running pattern number is input using the numeric keypad, the corresponding learning acceleration pattern map 63 is selected by the acceleration pattern switching unit 64, and the acceleration pattern is selected. The acceleration pattern calculation means 61 gives the coefficient k for each area to the shift speed calculation means 53 according to
Accelerate according to the driver's preference. When the identification number zero button 46d is pressed, the acceleration pattern switching means 64 selects the maker standard acceleration pattern map 62.

【The invention's effect】

As described above, according to the present invention, a standard acceleration pattern or a learning acceleration pattern is selected by the acceleration pattern switching means by keyboard input, and when acceleration acceleration of the vehicle is determined by the acceleration determination means, according to the selected acceleration pattern. The shift speed coefficient of the continuously variable transmission is controlled in accordance with the selected acceleration pattern by sequentially calculating the coefficient of the changed shift speed by the acceleration pattern switching unit and outputting the calculated coefficient to the shift speed calculation unit. . That is, the acceleration pattern of the vehicle can be selected according to the driver's preference, and the vehicle can be driven with the selected acceleration pattern. Here, when the learning acceleration pattern is selected by the acceleration pattern switching means, when the operation of the learning means is turned on by keyboard input, the selected acceleration pattern is changed by the learning means in accordance with the keyboard input,
This is stored as the selected learning acceleration pattern.
That is, the selected acceleration pattern can be learned and changed so as to better suit the taste, and the selected acceleration pattern can be more adapted to the driver's taste.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a belt-type continuously variable transmission, FIG. 2 is a block diagram showing a configuration of an electronic control device, FIG. 3 is an acceleration pattern diagram, and FIG. 4 is a schematic circuit diagram for explaining the operation of the learning means. 4 Beld-type continuously variable transmission, 40 Control unit, 41
… Primal pulley rotation speed sensor, 42 …… Secondary pulley rotation speed sensor, 44 …… Throttle opening degree sensor, 46 ……
Keyboard section 53 Shift speed calculation means 62 Maker standard acceleration pattern map 63 Learning acceleration pattern map 64 Acceleration pattern switching means 65 Learning means.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display F16H 59:40 59:42

Claims (2)

(57) [Claims] 1. A target gear ratio calculating means for calculating a target gear ratio based on signals from a throttle opening sensor and a secondary pulley rotational speed sensor, and an actual gear ratio based on signals from a primary pulley rotational sensor and a secondary pulley rotational sensor. A continuously variable transmission control device having an actual gear ratio calculating means for calculating a gear speed based on a deviation and a coefficient between the target gear ratio and the actual gear ratio. Acceleration pattern switching means for selecting an acceleration pattern or a learned acceleration pattern learned and stored in response to a keyboard input; acceleration determination means for determining when the vehicle is accelerating based on a signal from the throttle opening sensor; When the judging means judges acceleration, the acceleration pattern selected by the acceleration pattern switching means is inputted, and the acceleration pattern is selected. An acceleration pattern calculation means for sequentially calculating the coefficients of the shift speed corresponding to the pattern to output to the transmission speed calculation means, the acceleration pattern learning acceleration pattern which is the selected case,
Learning means for turning on / off the operation according to the keyboard input, changing the acceleration pattern selected by the acceleration pattern switching means at the time of the operation in accordance with the keyboard input, and storing the change as the selected learning acceleration pattern; A control device for a continuously variable transmission, comprising: 2. The control device for a continuously variable transmission according to claim 1, wherein a plurality of said learning patterns are provided.