JP3218962B2 - Transmission control device for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for a continuously variable transmission, and more particularly to an improvement in a shift control device having a manual mode.

[0002]

2. Description of the Related Art Continuously variable transmissions used in vehicles include:
Conventionally, there are a belt type and a toroidal type. In these continuously variable transmission shift control devices, a target speed ratio i * is set according to a vehicle speed VSP and a throttle opening TVO (or an accelerator opening).
In addition to the automatic transmission mode for determining the gear ratio, there is known a vehicle equipped with a manual mode for setting a predetermined target gear ratio, similarly to a conventional manual transmission. Some are disclosed.

[0003] The target speed ratio of the continuously variable transmission is set according to the shift position of a shift lever.
The driver can select a desired gear ratio regardless of the throttle opening TVO.

As shown in FIG. 8, the manual mode of the automatic transmission is such that the selector switch 5A of the shift lever 5 is constituted by an "H" type gate, and the automatic mode is switched between the automatic shift mode and the manual mode. It is conventionally known that a changeover switch 13 and an UP switch 8 and a DOWN switch 9 that are operated in the manual mode are provided, and the target gear ratio is relatively changed according to the operation of the shift lever 5. When the shift lever 5 is operated from the shift mode "D" to the left in the figure, the manual mode changeover switch 13 is turned on from OFF, and the manual mode is changed to the manual mode similar to the conventional manual transmission. If the stroke is made to the “+” side, the UP switch 8 turns on and the upshift is commanded. That one, likewise the shift lever 5 "-" if caused to stroke to the side DOWN switch 9 O
When N is reached, a downshift is commanded to change the target gear ratio relative to the current gear ratio (or gear position). Such gear control is hereinafter referred to as a sequential shift. In the figure, "P", "R", and "N" indicate parking, reverse, and neutral, respectively.

[0005] In a shift control device for a continuously variable transmission capable of continuously changing the gear ratio, the above-described sequential shift can be easily realized as a manual mode in addition to the automatic shift mode. As shown in FIG. 9, when the number of gears GP in the manual mode is six, the target gear ratios i (1) to i (1) to i (i) are set in accordance with the gears GP.
(6) is set in advance, and the shift lever 5 shown in FIG.
The target gear ratio i (n) is sequentially switched relatively in accordance with the operation toward the “+” or “−” side. In the manual mode, operation can be performed in the same manner as the gear position of the conventional manual transmission according to the manually determined target gear ratio i (n).

[0006]

However, in the above-described transmission control apparatus for a continuously variable transmission, as shown in FIG. 8, the shift lever 5 is operated from the "D" range of the automatic transmission mode to the manual mode. Then, the manual mode changeover switch 13 is turned from OFF to ON to shift to the manual mode. At this point, the accelerator opening T
When the gear ratio i in the automatic transmission mode, which continuously changes in accordance with the VO and the vehicle speed VSP, does not match the gear position GP in the manual mode and is at point A in FIG. = 2) or 3rd speed (GP = 3), the downshift or the upshift is performed. However, since the direction of this shift is not uniquely determined by the driving state, it is difficult for the driver to learn. In addition, there is a problem that a sense of incongruity is given when the mode is switched, and when downshifting when switching from the automatic transmission mode to the manual mode, sudden engine braking may occur. There was a problem of giving uncomfortable feeling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and smoothly switches from the automatic transmission mode to the manual mode without giving the driver a feeling of discomfort or discomfort. It is an object of the present invention to provide a shift control device for a continuously variable transmission capable of easily learning shift characteristics.

[0008]

According to a first aspect of the present invention, as shown in FIG. 10, an automatic speed change control means 61 for setting a target speed ratio i * of a continuously variable transmission 60 in accordance with a vehicle speed and an engine load.
A manual shift control means 62 for setting the target gear ratio of the continuously variable transmission 60 to one of a plurality of predetermined gear steps GP based on a signal from a manual shift command means 63 operated by the driver. And a shift mode switching unit 64 for selectively shifting between the automatic shift control unit 61 and the manual shift control unit 62, wherein the shift mode switching unit 64 sets the target gear ratio. When switching from the automatic transmission control means 61 to the manual transmission control means 62, the gear stage GP set by the manual transmission control means 62 is changed to the gear ratio iR set by the automatic transmission control means 61.
And a switch initializing means 65 for setting the gear position closest to the gear position to the Hi side.

Further, as shown in FIG. 10, the second invention comprises an automatic transmission control means 61 for setting a target transmission ratio i * of the continuously variable transmission 60 in accordance with a vehicle speed and an engine load, and A manual shift control unit 62 for setting a target gear ratio of the continuously variable transmission 60 to one of a plurality of predetermined shift stages GP based on a signal from the operated manual shift command unit 63; In a shift control device for a continuously variable transmission, comprising a shift mode switching means 64 for selectively switching between a control means 61 and a manual shift control means 62,
When the shift mode switching unit 64 switches the target gear ratio from the automatic shift control unit 61 to the manual shift control unit 62, the shift speed GP set by the manual shift control unit 62 is
Switching initialization means 6 which is closest to the speed ratio iR set by the automatic speed change control means 61 and which is set to a low gear.
5. A shift control device for a continuously variable transmission, comprising:

[0010]

According to the first aspect of the present invention, the target speed ratio i * of the continuously variable transmission can be switched between the automatic transmission control means and the manual transmission control means by the transmission mode switching means. In the shift mode, the target speed ratio i * of the continuously variable transmission is set almost continuously in accordance with the vehicle speed and the load of the engine. On the other hand, in the manual mode in which the manual shift control means is selected, the manual shift operated by the driver is performed. Based on a signal from the command means, the target speed ratio of the continuously variable transmission is set to one of a plurality of previously set shift speeds GP. When the speed change mode switching means switches from the automatic speed change control means to the manual speed change control means, the gear position GP set by the manual speed change control means is set closest to the speed ratio set by the automatic speed change control means, and Hi Since the shift speed is set on the side, the shift is always upshifted when switching from the automatic shift mode to the manual mode, so that the driver can easily learn the shift characteristics when switching the shift mode.

In the second invention, when the speed change mode switching means switches from the automatic speed change control means to the manual speed change control means, the gear stage GP set by the manual speed change control means is provided.
Is set to the gear position closest to the gear ratio set by the automatic gear shift control means and on the Low side, so that the shift operation is always downshifted when the automatic gear shift mode is switched to the manual mode, so that the driver can easily change the gear shift mode. The shift characteristics at the time of switching can be mastered.

[0012]

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

FIG. 1 shows a case where the continuously variable transmission 1 is constituted by a toroidal type continuously variable transmission 10 which continuously changes the gear ratio in accordance with the tilt angles of the two power rollers 18 and 20. The continuously variable transmission 1 includes a hydraulic control device 4 that controls the speed ratio of the continuously variable transmission 10 in accordance with a command from the shift control controller 2.

The continuously variable transmission 10 has a forward / reverse switching device 40 interposed between the engine and the torque converter 12, and has a hydraulic control device 4 supplied with hydraulic pressure from a hydraulic pump 84 to change the gear ratio i. Is what you do. The torque converter 12 is provided as a starting element. At a predetermined speed or higher, a lock-up (LU) clutch (not shown) operates, and the engine and the continuously variable transmission 1 are driven.
The 0 input shaft is directly connected.

The hydraulic control device 4 of the continuously variable transmission 1 has a step motor 61 driven by the shift control controller 2 mainly composed of a microcomputer.

The transmission control controller 2 is provided in the continuously variable transmission 10, the engine speed Ne and the throttle opening TVO input from the engine control controller 3, the selector position of the shift lever 5 from the selector switch 5 A, and the like. The input shaft rotation speed Nin and the output shaft rotation speed Nout (= vehicle speed VSP) from the input shaft rotation sensor 6 and the output shaft rotation sensor 7, respectively, are read, and a target gear ratio i * corresponding to the driving state of the vehicle is calculated. . The output shaft rotation sensor 7 functions as a vehicle speed sensor that detects the vehicle speed VSP.
The shift control controller 2 calculates the vehicle speed VSP by multiplying the output shaft rotation speed Nout by a predetermined constant.

The speed change controller 2 drives the step motor 61 of the hydraulic control device 4 based on the calculated target speed ratio i *, and controls the toroidal type continuously variable transmission 10.
The power rollers 18 and 20 are driven such that the tilt angles of the power rollers 18 and 20 coincide with the target speed ratio i *, and feedback control or the like is performed according to the actual speed ratio iR of the continuously variable transmission 10.

Here, the transmission control controller 2 is configured as shown in FIG.
As shown in the figure, a CPU 50 for performing arithmetic processing is mainly used, and a RAM 51 and a ROM 52 are provided as storage means.
Further, the A / D converter 53 reads the throttle opening TVO from the engine control controller 3, the engine speed Ne from the engine control controller 3, and the input / output shaft speeds Nin and Nout (= VS) of the continuously variable transmission 10.
P), a digital I / O 5 for reading signals from the counter 54, the selector switch 5A of the shift lever 5, etc.
5, and a digital I / O 56 for driving the step motor 61 of the hydraulic control device 4.

Here, the ROM of the shift control controller 2
A plurality of shift maps corresponding to two shift modes, an automatic shift mode and a manual mode, are stored in advance in the storage means such as 52, and in order to correspond to these shift modes, the shift lever 5 of the conventional example is used. As in FIG.
Equipped with "H" type gate, "D" in automatic shift mode
In addition to the range, a manual mode changeover switch 13 is provided as shift mode changeover means for selecting one of automatic shift and manual mode.

In the manual mode of the selector switch 5A, there are provided an UP switch 8 and a DOWN switch 9 for sequentially changing the gear stage GP in accordance with the operation of the shift lever 5 in the front-rear direction (vertical direction in the figure). Have.

The gear position in the manual mode is set in advance by the shift controller 2 in the same manner as in the above-described conventional example.
The shift map in the manual mode is shown in FIG. 9 in the same manner as in FIG.
The predetermined target gear ratios i (1) to i (6) are set in accordance with the target gear ratios i to n, respectively, and these target gear ratios i (n) decrease to the Hi side, that is, the gear ratios decrease as the gear position increases. It is set as follows.

On the other hand, when the shift lever 5 selects the "D" range automatic transmission mode, the throttle opening TVO (or the accelerator opening) indicating the engine load is displayed in the same manner as the conventional transmission control device for a continuously variable transmission. The target speed ratio i * is determined based on a speed map (not shown) corresponding to the vehicle speed VSP and the vehicle speed VSP.

Here, the outline of the control in this embodiment is as follows. As shown in FIG. 3, the transmission control controller 2 receives the signal Nin of the input shaft speed sensor 6 or the engine speed Ne from the engine controller 3 and the output shaft. The vehicle speed VSP based on the signal Nout from the rotation sensor 7, the throttle opening TVO from the throttle opening sensor 30 of the engine control controller 3, the shift mode detected from the manual mode changeover switch 13 of the selector switch 5A, and the UP switch 8 of the selector switch 5A Alternatively, it receives a signal from the DOWN switch 9 and outputs a predetermined pulse to the step motor 61 of the continuously variable transmission 1.

Next, an example of the control performed by the transmission control controller 2 will be described with reference to the flowcharts of FIGS. Each flowchart is executed at predetermined time intervals, for example, at every 10 msec.

In step S1 of FIG. 4, data is read from various sensors to detect the driving state of the vehicle.
The engine speed Ne and the throttle opening TVO are read from the engine control controller 3, and the input shaft speed Nin, the output shaft speed Nout (vehicle speed VSP) and the signal from the selector switch 5A of the shift lever 5 are transmitted from the continuously variable transmission 1. Read.

In step S2, a signal from the manual mode changeover switch 13 of the selector switch 5A is read to determine whether the current shift position is in the manual mode or the automatic shift mode "D".
In step S3, if the shift lever 5 is in the manual mode in which the shift lever 5 is operated to the left in the figure, the process proceeds to step S3. If the shift lever 5 is in the automatic shift mode, the process proceeds to step S4. The target gear ratio i * is set.

The shift control in the manual mode performed in step S3 is performed based on the flowchart of steps S10 to S16 shown in FIG. 5. Hereinafter, the shift control in the manual mode will be described in detail.

First, in step S10, it is determined whether or not the signal from the manual mode changeover switch 13 has been changed from OFF to ON by operating the shift lever 5, and when switching to the manual mode in which this signal has been changed to ON. If there is, the process proceeds to step S11, and an initialization process at the time of switching from the automatic shift mode to the manual mode is performed as described later.

Then, in step S12, the UP switch 8
Is changed from OFF to ON (the rising edge of the signal), and if the UP switch 8 is changed to ON, the process proceeds to step S13, where 1 is added to the current gear stage GP to increase by one stage. shift.

On the other hand, in step S14, it is determined whether the DOWN switch 9 has been changed from OFF to ON by operating the shift lever 5 (the rising edge of the signal). If the DOWN switch 9 has been changed to ON, the process proceeds to step S15. Proceeding to the process, 1 is subtracted from the current shift stage GP to shift down one stage.

Although not shown, the minimum value of the gear stage GP is regulated to 1 and the maximum value thereof is regulated to 6.

When the gear stage GP is determined, step S1 is executed.
In step 6, the target speed ratio i * is set to a value corresponding to the gear stage GP, and the process returns to the main routine of FIG. 4. In step S5 of FIG. 4, the actual speed ratio iR of the continuously variable transmission 10 is set to the target speed. The actuator such as the step motor 61 is driven so as to match the ratio i *.

Next, the initialization processing at the time of mode switching performed in step S11 will be described in detail with reference to the flowchart of FIG.

First, in step S20, a variable n for controlling the gear stage GP is reset to 0, and then in step S2
1 adds 1 to the variable n.

In step S22, it is determined whether the target speed ratio i (n) corresponding to the variable n is equal to or less than the current actual speed ratio iR.

If the target gear ratio i (n) corresponding to the variable n is equal to or less than the actual gear ratio iR, the process proceeds to step S24, and the gear stage GP is set to the current variable n. Here, the actual speed ratio iR is the ratio between the input shaft speed Nin and the output shaft speed Nout, and is constantly monitored.

On the other hand, if not, step S2
The process proceeds to 3 to determine whether or not the variable n is the maximum value 6 of the gear stage GP. If the variable n is the maximum value 6, the process proceeds to step S24.
To step S if the variable n is less than the maximum value 6.
Returning to 21, the target speed ratio i (n) of the gear stage GP in the manual mode and the actual speed ratio iR are sequentially compared from the first speed.

When the mode is switched to the manual mode, the actual speed ratio iR is changed to the lowest gear (1st gear).
Speed) to the Hi gear (6th speed),
Gear ratio i set in automatic gear mode (= actual gear ratio i
R), the shift stage GP closest to the Hi side (the gear ratio is small)
Upshifting.

Therefore, the gear ratio i at the point A in FIG.
When the shift lever 5 is operated to the left in FIG. 8 and the manual mode changeover switch 13 is changed from OFF to ON while the vehicle is traveling in the automatic shift mode, the manual mode closest to the gear ratio i of the automatic shift mode is set. Is always upshifted toward the gear stage GP, so that the shift direction does not become unstable when the shift mode is switched as in the conventional example, and the driver can easily change the shift characteristics at the time of this mode switch. It can be mastered, and when switching from the automatic transmission mode to the manual mode, the shift is always upshifted, so that it is possible to prevent the engine brake unintended by the driver and to switch the mode smoothly, The operability of the continuously variable transmission equipped with the manual mode is greatly improved without giving any discomfort or discomfort. Is the is possible to.

FIG. 7 shows a second embodiment, in which the initialization processing at the time of shifting the speed change mode of the first embodiment is performed on the downshift side, and other configurations are the same as those of the first embodiment. Is the same as

FIG. 7 is a flowchart showing a subroutine of the switching initialization process performed in step S11 of the flowchart shown in FIG. 6 of the first embodiment.

In steps S30 to S34, contrary to the first embodiment, the actual speed ratio iR set in the automatic speed change mode is changed from the highest Hi speed of the speed stage GP (sixth speed) to Lo.
Comparing sequentially to the w-side gear stage, when switching from the automatic gearshift mode to the manual mode, downshifting to the low-side (larger gear ratio) gear stage GP closest to the gear ratio i in the automatic gearshift mode is performed. Things.

Also in this case, similarly to the first embodiment, when the mode is switched to the manual mode, the downshift is always performed, so that the driver can easily learn the shift characteristics at the time of the switching. If the user is familiar with downshifting when switching the shift mode, switching from the automatic shift mode to the manual mode can be used as an engine brake. Operability can be improved.

In the above-described embodiment, an example in which the manual mode changeover switch 13, the UP switch 8, and the DOWN switch 9 are operated in accordance with the displacement of the shift lever 5 is shown. Alternatively, they may be arranged on an instrument panel or the like.

Further, an example in which the continuously variable transmission 10 is of a toroidal type is shown, but it is not shown, but it may be of a belt type or the like. There is no limitation, and any number of gears can be set.

The switching initialization process (step S2)
3. In S33), the actual gear ratio iR is compared with the gear ratio of each gear, but the same applies to the comparison with the target gear ratio i * set in the automatic gear shift mode.

[0047]

As described above, according to the first aspect of the present invention, when the shift mode switching means switches from the automatic shift control means to the manual shift control means, the shift speed GP set by the manual shift control means is changed to the automatic shift position. In order to set the gear ratio closest to the gear ratio set by the control means and to the gear position on the Hi side, the shift is always upshifted when switching from the automatic gearshift mode to the manual mode. Since the shift direction does not become indeterminate, the driver can easily learn the shift characteristics at the time of switching the shift mode, and since switching from the automatic shift mode to the manual mode is always upshifting, It is possible to smoothly switch modes while preventing engine braking that the driver does not intend, which makes the driver feel uncomfortable or uncomfortable Gone to give, it's becomes possible to significantly improve the operability of the continuously variable transmission having a manual mode.

Further, according to a second aspect of the present invention, when the shift mode switching means switches from the automatic shift control means to the manual shift control means, the shift stage GP set by the manual shift control means is provided.
Is set to the gear position closest to the gear ratio set by the automatic gear shift control means and on the Low side, so that the shift operation is always downshifted when the automatic gear shift mode is switched to the manual mode, so that the driver can easily change the gear shift mode. The shift characteristics at the time of switching can be mastered, and if the downshift at the time of switching the shift mode is mastered, the switching from the automatic shift mode to the manual mode can be used as an engine brake. Thus, the operability of the continuously variable transmission having the manual mode can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a block diagram showing details of a shift control controller.

FIG. 3 is a conceptual diagram of shift control in a manual mode.

FIG. 4 is a flowchart of a main routine showing an example of control performed by a shift control controller.

FIG. 5 is a flowchart of a subroutine showing an example of manual mode control.

FIG. 6 is a flowchart of a subroutine showing an example of a switching initialization process.

FIG. 7 is a flowchart of a subroutine showing an example of a switching initialization process according to the second embodiment.

FIG. 8 is a plan view of a shift lever of the continuously variable transmission provided with the manual mode.

FIG. 9 is a shift map in a manual mode of the continuously variable transmission, showing a relationship between a vehicle speed VSP and a target input shaft rotation speed.

FIG. 10 is a claim correspondence diagram corresponding to the first or second invention.

[Explanation of symbols]

 2 Transmission control controller 3 Engine control controller 4 Hydraulic control device 5 Shift lever 6 Input shaft rotation sensor 7 Output shaft rotation sensor 8 UP switch 9 DOWN switch 10 Continuously variable transmission 12 Torque converter 13 Manual mode changeover switch 18, 20 Power roller 40 Forward / reverse switching device 61 Step motor 84 Hydraulic pump 50 CPU 51 RAM 52 ROM 53 A / D 54 Counter 55, 56 Digital IO 60 Continuously variable transmission 61 Automatic shift control means 62 Manual shift control means 63 Manual shift command means 64 Shift mode Switching means 65 Switching initialization means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (2)

(57) [Claims] An automatic transmission control means for setting a target transmission ratio of a continuously variable transmission according to a vehicle speed and an engine load, and a continuously variable transmission based on a signal from a manual transmission instruction means operated by a driver. Manual shift control means for setting a target gear ratio of the engine to one of a plurality of preset gears; and shift mode switching means for selectively switching between the automatic shift control means and the manual shift control means. In the shift control device for a continuously variable transmission, when the shift mode switching means switches the target gear ratio from the automatic shift control means to the manual shift control means, the shift speed set by the manual shift control means is changed by the automatic shift control. A shift control device for a continuously variable transmission, comprising: a switching initialization device that sets the gear ratio closest to the gear ratio set by the device and to a Hi-gear shift speed. An automatic transmission control means for setting a target transmission ratio of the continuously variable transmission in accordance with a vehicle speed and an engine load; and a continuously variable transmission based on a signal from a manual transmission instruction means operated by a driver. Manual shift control means for setting a target gear ratio of the engine to one of a plurality of preset gears; and shift mode switching means for selectively switching between the automatic shift control means and the manual shift control means. In the shift control device for a continuously variable transmission, when the shift mode switching means switches the target gear ratio from the automatic shift control means to the manual shift control means, the shift speed set by the manual shift control means is changed by the automatic shift control. A shift initialization means for setting a gear ratio closest to the gear ratio set by the means and to a low gear position.