JPH09303538A - Continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vehicle to travel according to a speed change pattern suitable for a travel mode by reading a gear ratio from a memory means, upon a driver's instruction regarding a shift-up or a shift-down operation, operating an actuator so as to correspond to the gear ratio, and changing the gear ratio of a continuously variable transmission. SOLUTION: A continuously variable transmission 12 is formed to have a hydraulic actuator 45 of a secondary pulley 41 fed with line pressure from a primary regulator valve 82 at all times, and the hydraulic actuator 45 generates such a belt clamping force as depending on applied torque. On the other hand, a linear solenoid valve is controlled on the basis of a speed change signal SG4 sent from a control part 206 to a speed change solenoid 403, thereby generating control hydraulic pressure. In addition, hydraulic pressure applied under the control of a ratio control valve with the control hydraulic pressure is fed to the hydraulic actuator 43 of a primary actuator 43, thereby determining the gear ratio of the continuously variable transmission 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission.

[0002]

2. Description of the Related Art Conventionally, a V-belt type continuously variable transmission (CV
In a continuously variable transmission equipped with T), a V-belt is stretched between a primary pulley and a secondary pulley, and the intervals between the "V" -shaped grooves of the primary pulley and the secondary pulley are changed. By changing the effective diameter of the primary pulley and the secondary pulley,
It is designed to perform gear shifting with a stepless gear ratio. In addition,
In this case, the gear ratio is a value obtained by dividing the rotation speed of the primary pulley by the rotation speed of the secondary pulley.

In a continuously variable transmission capable of selecting between the continuously variable transmission mode and the continuously variable transmission mode, when the continuously variable transmission mode is selected, the primary pulley of the primary pulley is made to correspond to the engine load. The target rotation speed is set, and the gear ratio is changed so that the target rotation speed is achieved. Further, when the stepped shift mode is selected, the driver operates a shift lever or the like to sequentially select a plurality of preset shift stages, and a gear ratio set corresponding to each shift stage is selected. It is possible to drive the vehicle in a gear shift pattern.

Therefore, a stepped speed change step and a speed change ratio corresponding to the stepped speed change step are preset and stored in a storage device as a speed change table. Then, when shifting from the continuously variable shift mode to the continuously variable shift mode, the gear ratio is once (temporarily) fixed to the value when the continuously variable shift mode was selected, and the driver operates the shift lever or the like. When an upshift or downshift stepwise gear shift instruction is given, a predetermined gear stage and gear ratio of the gear shift table are selected.

[0005]

However, in the above-mentioned conventional continuously variable transmission, since the stepped gears and the gear ratios are set in advance, the traveling states of urban areas, mountainous areas, highways, etc. In some cases, the vehicle may not be able to travel in a gear shift pattern according to the driver's preference.

That is, since the vehicle is allowed to run at the preset stepped gears and gear ratios, the gear shift pattern itself cannot be changed. The present invention solves the problems of the conventional continuously variable transmission,
To provide a continuously variable transmission capable of traveling a vehicle in a gearshift pattern suitable for a traveling state, changing gearshift specifications, and allowing the vehicle to travel in a gearshift pattern according to a driver's preference. With the goal.

[0007]

To this end, in a continuously variable transmission according to the present invention, a continuously variable transmission that changes gears at a continuously variable transmission ratio, and an actuator that changes the gear ratio of the continuously variable transmission. A stepped shift instruction means for instructing a stepped shift of an upshift and a downshift, a stepped speed change step, and a storage means for storing a gear ratio corresponding to the stepped speed change step; Actuator operating means for reading out a gear ratio from the storage means based on an instruction from the gear instructing means and operating the actuator corresponding to the gear ratio;
It has an input means and a gear ratio setting means for setting a gear ratio corresponding to each stepped gear based on the operation of the input means.

In another continuously variable transmission according to the present invention, further, there is provided an appropriate gear ratio setting means for keeping each gear ratio set by the gear ratio setting means within an appropriate range. In still another continuously variable transmission according to the present invention, the appropriate gear ratio setting means further compares the gear ratios of adjacent gears among the gear ratios set by the gear ratio setting means.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram of a continuously variable transmission according to an embodiment of the present invention. In the figure, 12 is a continuously variable transmission that performs gear shifting at a continuously variable transmission ratio, 43 is a hydraulic actuator as an actuator that changes the gear ratio of the continuously variable transmission 12, and 252
Is a RAM as a storage means, 254 is an actuator operating means for operating the hydraulic actuator 43, 30
Reference numeral 1 is a shift lever as stepped gear shift instruction means, 452 is an operation panel as input means, and 460 is a gear ratio setting means.

FIG. 2 is a schematic diagram of the continuously variable transmission according to the embodiment of the present invention. In the figure, reference numeral 11 denotes a continuously variable transmission, which comprises a V-belt type continuously variable transmission 12, a forward / reverse mode switching device 13, a torque converter 16, a counter shaft 17, and a differential device 19. Have. Then, the torque converter 1
6 is the engine output shaft 20 through the front cover 27.
A pump impeller 21 which is connected to the engine 10 and is rotated by an engine (not shown), a turbine runner 23 which is connected to the input shaft 22, a stator 26 which is supported by the case 10 through a one-way clutch 25, the front cover 27 and the input shaft 22. And a lock-up clutch 15 disposed between and.

Reference numeral 30 denotes a damper spring disposed between the lockup clutch plate 15a and the input shaft 22, and 31 denotes an oil pump which is connected to the pump impeller 21 and is driven by the rotation of the engine. Is. The continuously variable transmission 12 includes a primary shaft 32.
Fixed sheave 33 fixed to the primary shaft 32 and a movable sheave 35 slidably mounted on the primary shaft 32, a primary pulley 36, a fixed sheave 39 fixed to a secondary shaft 37, and the secondary shaft. It has a secondary pulley 41 composed of a movable sheave 40 slidably arranged with respect to 37, and a metallic V belt 42 stretched between the primary pulley 36 and the secondary pulley 41.

Further, on the back surface of the movable sheave 35 of the primary pulley 36, a hydraulic actuator 43 having a double piston structure and a movable sheave 40 of the secondary pulley 41 are provided.
The hydraulic actuators 45 having a single-piston structure are arranged on the back surface of each. The hydraulic actuator 43 on the primary pulley 36 side includes a cylinder member 46 and a reaction force support member 47 fixed to the primary shaft 32, and a tubular member 4 fixed to the movable sheave 35.
9 and the piston member 50. Further, the cylindrical member 49, the reaction force support member 47, and the back surface of the movable sheave 35 form a first hydraulic chamber 51, and the cylinder member 46 and the piston member 50 form a second hydraulic chamber 52.

In this case, the first hydraulic chamber 51 and the second hydraulic chamber 51
The hydraulic chambers 52 are communicated with each other through the communication holes 47a, and the axial force generated when the hydraulic pressure is applied is the hydraulic actuator 45 on the secondary pulley 41 side.
It is twice as much. On the other hand, the hydraulic actuator 45 on the secondary pulley 41 side has a reaction force support member 53 fixed to the secondary shaft 37, and a tubular member 55 fixed to the back surface of the movable sheave 40. Further, the reaction force support member 53 and the tubular member 55 form a hydraulic chamber 56. A spring 57 for preloading is arranged between the movable sheave 40 and the reaction force support member 53 to urge the movable sheave 40 toward the fixed sheave 39.

The forward / reverse mode switching device 13 is
It comprises a double pinion planetary gear 60 for switching between forward and reverse, a reverse brake B ₁ , a first clutch C ₁ , a second clutch C ₂ and a one-way clutch F. And
The first clutch C ₁ and the one-way clutch F are arranged in series, and the first clutch C ₁ and the one-way clutch F and the second clutch C ₁ are provided between the input shaft 22 and the fixed sheave 33 of the primary pulley 36. Clutch C ₂ of the above is disposed in parallel.

Further, in the double pinion planetary gear 60, the sun gear S is on the input shaft 22, the carrier CR supporting the first pinion P ₁ and the second pinion P ₂ is on the fixed sheave 33 of the primary pulley 36, and the ring gear. R is connected to each of the reverse brakes B ₁ . The large gear 61 and the small gear 62 are fixed to the counter shaft 17, and the large gear 61 and the gear 63 fixed to the secondary shaft 37 mesh with each other.
The small gear 62 and the gear 65 of the differential device 19 are brought into mesh with each other.

The differential device 19 includes a differential case 76 to which the gear 65 is fixed, and the differential case 7
6 has a differential gear 66 supported by 6 and left and right side gears 67, 69, and the rotation transmitted to the differential case 76 via the gear 65 is differentiated by the differential gear 66 and the side gears 67, 69 to produce left and right axles. 70,
71 is transmitted. In addition, 200 is an engine speed sensor, 201 is an input shaft speed sensor, and 202 is a vehicle speed sensor.

Next, the hydraulic circuit of the continuously variable transmission 11 having the above construction will be described. FIG. 3 is a hydraulic circuit diagram of the continuously variable transmission according to the embodiment of the present invention. In the figure, 3
1 is an oil pump, 80 is an oil pump control valve, 81 is a solenoid valve for the control valve,
Reference numeral 82 is a primary regulator valve, 83 is a secondary regulator valve, 85 is a line pressure control linear solenoid valve, and 86 is a solenoid valve modulator valve.

Numeral 87 is a manual valve. The manual valve 87 is operated by a driver so that the hydraulic pressure of the line pressure port 1 is changed to the port 2 as shown in the table in the figure.
Or it can be switched to 3. 89 is a modulator valve, 90 is a C2 control valve, 91 is a duty control solenoid valve, and C1 is the first clutch C.
₁ hydraulic servo (Fig. 2), C2 is the second clutch C ₂ of the hydraulic servo, B1 is reverse brake B ₁ of the hydraulic servo 100 is an accumulator for the hydraulic servo B1,
Reference numeral 101 is an accumulator for the hydraulic servo C1.

Further, 102 is a ratio control valve for controlling the gear ratio, 103 is a linear solenoid valve for adjusting the control hydraulic pressure supplied to the ratio control valve 102, 43 is a hydraulic actuator on the primary pulley 36 side, and 45 is a hydraulic actuator. Is a hydraulic actuator on the secondary pulley 41 side. Further, 16 is a torque converter, 105 is a lockup control valve,
106 is a lock-up relay valve, 107 is a linear solenoid valve for lock-up control, and 109 is a cooler.

Next, the control device of the continuously variable transmission 11 having the above-mentioned structure will be described. FIG. 4 is a block diagram of a control device for a continuously variable transmission according to an embodiment of the present invention, and FIG. 5 is a schematic diagram of a speed selecting device according to an embodiment of the present invention. In the figure, reference numeral 206 denotes a control unit (E
CU), and the control unit 206 is provided with an engine speed sensor 200 for detecting an engine speed, a rotation speed of the primary pulley 36 (FIG. 2), that is, a rotation speed of the input shaft 22 (hereinafter referred to as “input shaft rotation speed”). The input shaft rotation speed sensor 201, the rotation speed of the secondary pulley 41, that is, the vehicle speed sensor 202 that detects the vehicle speed, the accelerator depression amount, that is, the accelerator sensor 203 that detects the throttle opening, and the position sensor 205. Are connected respectively.

The control unit 206 includes a ROM 25
1 and a RAM 252 are built in, and the ROM 25
1 stores a control program or the like, and the RAM 252
The gear ratio and the gear ratio corresponding to the gear ratio are set in advance and stored as a gear change table. In this case, the shift table can be rewritten as needed. Therefore, the control unit 20
6, a display panel 451 including a liquid crystal display,
An operation panel 452 including keys, switches and the like is connected.

By the way, in the present embodiment, the speed selecting device comprises a shift lever 301 as shown in FIG.
By operating the shift lever 301, each switch (not shown) constituting the position sensor 205 is turned on / off. Then, by moving the shift lever 301 in the continuously variable transmission mode guide groove 302, the shift lever 301 can be set at the parking range position P, the reverse traveling range position R, the neutral range position N, the forward traveling range position D and the low range position L. When the shift lever 301 is placed at the forward drive range position D, the continuously variable transmission mode is selected.

Further, the shift lever 301 is moved to the stepped speed change mode guide groove 304 via the mode shift groove 303, and is moved in the stepped speed change mode guide groove 304 to instruct the stepped speed change. You can
When the shift lever 301 is placed at the upshift position +, the position sensor 205 sends an upshift gear shift instruction to the control unit 206, and the shift lever 301
Position downshift position-, position sensor 20
A downshift gear shift instruction is sent from 5 to the control unit 206.

Further, the control unit 206 includes a pump solenoid 381 for controlling the control valve solenoid valve 81 (FIG. 3), a line pressure solenoid 385 for controlling the line pressure control linear solenoid valve 85, Duty control solenoid valve 9
A C ₂ solenoid 391 for controlling the C.I. 1, a shift solenoid 403 for controlling the linear solenoid valve 103, and a lockup solenoid 407 for controlling the linear solenoid valve 107 are connected.

Next, the operation of the control device having the above construction will be described. First, when the rotation of the engine (not shown) is transmitted to the oil pump 31, the oil pump 31 generates a predetermined hydraulic pressure. In addition, the control unit 206
Sends a signal SG1 calculated based on the engine load to the line pressure solenoid 385, and causes the line pressure control linear solenoid valve 85 to generate a control hydraulic pressure. Then, when the control hydraulic pressure is sent to the primary regulator valve 82, the primary regulator valve 82 regulates the hydraulic pressure generated by the oil pump 31 into a line pressure.

When the driver selects the forward drive range or the low range in the continuously variable transmission mode and places the shift lever 301 at the forward drive range position D or the low range position L, the line pressure port 1 of the manual valve 87 is set.
Is supplied to the hydraulic servo C1 via the port 2, and the first clutch C ₁ is engaged. as a result,
The rotation of the engine output shaft 20 depends on the torque converter 16,
It is transmitted to the primary pulley 36 via the input shaft 22, the one-way clutch F, and the first clutch C _1, and is transmitted at a predetermined gear ratio in the continuously variable transmission 12 to be transmitted to the secondary pulley 41. The rotation of the secondary pulley 41 is transmitted to the left and right axles 70 and 71 via the counter shaft 17 and the differential device 19. When the forward drive range is selected, only the first clutch C ₁ is engaged via the one-way clutch F, so the engine brake does not operate during coasting.

When the low range is selected, the shift
It is positive that the lever 301 is in the low range position L.
Detected by the motion sensor 205, the control unit 206
La C _TwoThe duty signal SG3 is sent to the solenoid 391 for
Can be And the solenoid valve 9 for duty control
1 is controlled, C2 control valve 90 is switched
Is supplied to the hydraulic servo C2, and the first clutch
Chi C₁Second clutch C besides_TwoAre engaged.
As a result, the engine brake is activated during the coast
be able to.

When the driver selects the reverse drive range in the continuously variable transmission mode and places the shift lever 301 at the reverse drive range position R, the hydraulic pressure from the line pressure port 1 of the manual valve 87 passes through the port 3. Te is supplied to the hydraulic servo B1, the reverse brake B ₁ is engaged. At this time, the ring gear R of the double pinion planetary gear 60 is fixed, and the rotation input from the input shaft 22 to the sun gear S is output as the reverse rotation from the carrier CR and transmitted to the primary pulley 36.

By the way, in the continuously variable transmission 12, the hydraulic actuator 45 on the secondary pulley 41 side is provided.
The line pressure is constantly supplied from the primary regulator valve 82 to the hydraulic actuator 45, and the belt clamping force corresponding to the load torque is generated by the hydraulic actuator 45. On the other hand, from the control unit 206 to the shift solenoid 40
The linear solenoid valve 103 is controlled on the basis of the shift signal SG4 sent to the control valve 3, and control hydraulic pressure is generated. Then, the ratio control valve 102 is controlled by the control oil pressure, and the ratio control valve 1
The apply hydraulic pressure controlled by 02 is supplied to the hydraulic actuator 43 on the primary pulley 36 side. As a result, the gear ratio of the continuously variable transmission 12 is determined.

In this case, in the control unit 206, for example, based on the best fuel consumption power line capable of driving the engine with the best fuel consumption, the best fuel consumption primary pulley rotation corresponding to the throttle opening detected by the accelerator sensor 203. The number is calculated, and the best fuel consumption primary pulley rotation speed is set as the target rotation speed. Then, the actual input shaft rotational speed detected by the input shaft rotational speed sensor 201 is compared with the target rotational speed, and when the actual input shaft rotational speed is higher than the target rotational speed, the apply hydraulic pressure is increased. As a result, the effective diameter of the primary pulley 36 increases and the gear ratio of the continuously variable transmission 12 decreases,
Upshift shifting is performed. Further, when the actual input shaft rotation speed is lower than the target rotation speed, the apply hydraulic pressure is lowered. As a result, the effective diameter of the primary pulley 36 becomes smaller and the gear ratio of the continuously variable transmission 12 becomes larger,
Downshifting is performed.

When the stepped shift mode is selected while the forward drive range in the stepless shift mode is selected, the position sensor 205 causes the shift lever 301 to move to the stepped shift mode guide groove 304. It is detected that the stepped shift mode is detected, and the stepwise shift mode detection signal SG5 is sent to the control unit 206. When the position sensor 205 sends the stepped shift mode detection signal SG5, the control unit 206 determines that the stepless shift mode has changed to the stepped shift mode, and shifts from the stepless shift mode to the stepped shift mode. The transmission gear ratio at this time is calculated as the transmission transmission gear ratio α _M. Here, when the input shaft speed is N _I and the vehicle speed is N _O when shifting from the continuously variable transmission mode to the stepped transmission mode, α _M = N _I / N _O.

[0032] Then, the control unit 206, by setting the transition time speed ratio alpha _M to the gear ratio alpha of the target, to fix the gear ratio of the value of the transition time of the gear ratio alpha _M. next,
The control unit 206 determines whether or not there is a gear shift instruction in the stepped gear shift mode based on the gear shift operation detection signal SG6 sent from the position sensor 205, and if there is a gear shift instruction, an upshift gear shift instruction is issued. Determine if there was. In this case, when the shift lever 301 moved to the stepped speed change mode guide groove 304 is moved in the stepped speed change mode guide groove 304 and placed at the upshift position +, an upshift speed change instruction is given. If it is determined that the downshift position is −, it is determined that a downshift gear shift instruction has been issued.

Then, the driver operates the shift lever 301.
Is placed in the upshift position +, the control unit 206
When it is determined that the next higher gear is selected, the RAM 25
The speed change table stored in No. 2 is referred to, the speed change ratio of the first speed change step is read, and the speed change output is generated according to the speed change ratio. As a result, the effective diameter of the primary pulley 36 is increased, and upshifting is performed.

When the driver places the shift lever 301 in the downshift position-, the control unit 206 causes the 1
When it is determined that the lower gear is selected, the RAM 252 is selected.
The gear ratio of the one lower gear is read out by referring to the gear ratio table stored in, and a gear change output is generated according to the gear ratio. As a result, the effective diameter of the primary pulley 36 is reduced, and downshifting is performed.

If the difference between the shift gear ratio α _M and the gear ratio of the gear one level higher is small and falls within a predetermined range, the gear ratio of the gear one gear higher is selected. Similarly, when the difference between the shift gear ratio α _M and the gear ratio of the gear one step lower is small and falls within a predetermined range, the gear ratio of the gear one lower is selected. . By the way, as described above, the shift table stored in the RAM 252 includes a plurality of preset stepped gears and a gear ratio set corresponding to each of the stepped gears. Then, a shift pattern including a combination of the above-mentioned stepped shift stages and respective shift ratios is set for each shift specification mode and for each traveling state mode.

Therefore, by selecting the shift specification mode and the running state mode, it is possible to select the shift pattern suitable for the shift specification and the running state. Also,
It is also possible to make the shift pattern different between the upshift shift and the downshift shift. For example, in the present embodiment, as the shift specification mode, a standard specification mode having a standard shift pattern, a circuit specification mode having a shift pattern suitable for running the vehicle on a well-known circuit field, and a well-known sports car Sports car specification mode consisting of a gear shift pattern suitable for running
Also, there is an original specification mode consisting of a shift pattern that can be arbitrarily set by the driver, and the driver can select any shift specification mode among the standard specification mode, the circuit specification mode, the sports car specification mode and the original specification mode. Can be selected.

Then, as the traveling state mode of the standard specification mode, the urban mode including a shift pattern suitable for urban driving, the mountain mode including a shift pattern suitable for mountain traveling, and the shifting pattern suitable for highway traveling are selected. There is a highway mode, and the driver can select any driving mode among the city mode, the mountainous mode and the highway mode.

[0038] In addition, there are Suzuka mode, Fuji Speedway mode, Mizunami mode, etc. suitable for the driving condition of each circuit field as the driving condition modes of the circuit specification mode, and suitable for the driving condition of each vehicle as the sports car specification mode. There are a Ferrari mode, a Porsche mode, a launcher mode, etc., and the driver can select an arbitrary driving state mode.

Further, in the case of the original specification mode, the driver can set an arbitrary running state mode according to his / her preference. Then, in the standard specification mode, the circuit specification mode, and the sports car specification mode, for example, predetermined gear stages, for example, 4 to 8 gears, are preset for each running state mode, and gear ratios corresponding to the gear stages are set. Is also preset.

In the original specification mode, the driver can not only arbitrarily set the number of gears but also the gear ratio corresponding to each gear. In this case, the upshift gearshift and the downshift gearshift may have the same or different gearshift patterns. Therefore, the driver can drive the vehicle in a speed change pattern according to the speed change specification and the driver's preference.

Next, the operation of the continuously variable transmission 11 when setting the shift pattern will be described. FIG. 6 is a flowchart of a main routine showing the operation of the continuously variable transmission according to the embodiment of the present invention, and FIG. 7 is a view showing a display example of the display panel according to the embodiment of the present invention.

First, the driver operates the operation panel 452 (FIG. 4) to set a shift pattern,
The shift pattern setting screen 461 as shown in FIG. 7 is displayed on the display panel 451 and subsequently, an instruction as to whether or not to select the original specification mode is performed. The shift pattern setting screen 461 includes a shift specification mode display area AR1 for displaying the selected shift specification mode and a traveling state mode display area A for displaying the selected traveling state mode.
R2, a gear number display area AR3 for displaying the selected gear number, an update state display area AR4, R for displaying whether or not the gear shift pattern is being updated.
A memory storage state display area AR5 for displaying whether or not it is stored in the AM 252, a set gear ratio display area AR6 for displaying a set gear ratio, and a cursor display area for displaying a cursor position. AR7 and a gear stage display area AR8 for displaying each gear stage up to the selected number of gear stages.

Then, the control unit 206 determines whether or not there is an instruction to select the original specification mode, and if there is an instruction, immediately executes the shift speed input processing,
If there is no instruction, the mode input process is performed, and then the shift stage input process is performed. In the mode input process, the control unit 206 selects one of the gear shift specification modes from the standard specification mode, the circuit specification mode, and the sports car specification mode based on the operation of the operation panel 452 by the driver. One of the running state modes is selected from the gear shift specification modes. As a result, the selected gear change specification mode is displayed in the gear change specification mode display area AR1, and the selected traveling state mode is displayed in the traveling state mode display area AR.
2 are displayed respectively.

In the shift stage input process, the control unit 206 selects the shift stage number based on the operation of the operation panel 452 by the driver. As a result, the selected gear number is displayed in the gear number display area AR3, and each gear number up to the selected gear number is displayed in the gear display area AR8.
The gear ratio preset corresponding to each gear is displayed in the set gear ratio display area AR6.

Next, the gear ratio setting means 460 (FIG. 1) of the control unit 206 carries out a gear ratio setting process. At this time,
By operating the operation panel 452 by the driver, each gear ratio displayed in the set gear ratio display area AR6 can be stored in the RAM 252 as it is, and each displayed gear ratio can be changed to an arbitrary gear ratio. RAM 252
It can also be stored in.

The appropriate gear ratio setting means (not shown) of the control unit 206, when each displayed gear ratio is changed, does the gear ratio set corresponding to each gear position fall within an appropriate range? Determine whether Therefore, the appropriate gear ratio setting means corresponds to the minimum rotation speed that causes engine stall when the gear ratio is upshifted and downshifted at each set gear position. Is greater than the minimum gear ratio, and is smaller than the minimum gear ratio corresponding to the maximum rotation speed that causes the engine to overrevise.

In this case, whether or not the engine is stalled and whether or not the engine is over-revolved depends on the engine speed at that time. In the present embodiment,
The proper gear ratio setting means sets the gear ratios of two gear positions adjacent to each other among the set gear ratios to r and r, respectively.
When set to +1 and when performing upshifting, r /
It is determined whether the value of (r + 1) is within the proper range.

In order to prevent engine stalling, the minimum value of r / (r + 1) is set in order to prevent the driver from feeling a shift due to a small change in engine speed. Is set to the maximum value of r / (r + 1), and the gear ratio is set such that, for example, 0.55 <r / (r + 1) <0.8.

Therefore, the engine speed is 4000
If an upshift is instructed when the speed is [rmp], the engine speed will be 2200 to 3200 after the shift.
Changes to the value of [rmp]. Also, the engine speed is 1
If an upshift is instructed when the engine speed is 000 [rmp], the engine speed may become 550 [rmp].
Shifting can also be prohibited.

On the other hand, when a downshift is performed, the appropriate gear ratio setting means determines whether the value of (r + 1) / r falls within an appropriate range. The minimum value of r / (r + 1) is set in order to prevent the engine from being over-revolved, and the driver does not feel a shift due to a small change in the engine speed. The maximum value of r / (r + 1) is set, and the gear ratio is set so that, for example, 1 / 0.8 <r / (r + 1) <1 / 0.55.

Therefore, the engine speed is 3000
When the downshift is instructed when the speed is [rmp], the engine speed is 3750 to 5456 after the shift.
Changes to the value of [rmp]. Also, the engine speed is 4
If the downshift is instructed when the engine speed is 000 [rmp], the engine speed may become 7272 [rmp]. Therefore, when the engine speed is excessively high, the speed change may be prohibited. .

In this way, when the gear shift specification mode, the running state mode, and the number of gear stages are selected and the gear ratios corresponding to each gear stage are set, the control unit 206 causes the driver to operate the operation panel 452. The gear ratio storing process is performed based on the operation, and the set gear and gear ratio are set to the RA.
Store in M252. Next, the flowchart will be described. Step S1 The control unit 206 determines whether or not there is an instruction to select the original specification mode. If there is an instruction to select the original specification mode, the process proceeds to step S3, and if not, the process proceeds to step S2. In step S2 mode input processing is performed. In step S3, the shift speed input process is performed. In step S4, the gear ratio preset corresponding to the selected gear is displayed. In step S5, the gear ratio setting process is performed. In step S6, the gear ratio storing process is performed. In step S7, the gear ratio output process is performed.

Next, the mode input process subroutine in step S2 of FIG. 6 will be described. FIG. 8 is a flowchart of a subroutine of mode input processing according to the embodiment of the present invention. In step S2-1, the shift specification mode is output to the monitor. Step S2-2: Input the selected shift specification mode. Step S2-3 The running state mode is output to the monitor. Step S2-4 Input the selected traveling state mode.

Next, the subroutine of the gear ratio setting process in step S5 of FIG. 6 will be described. FIG. 9 is a flowchart of a subroutine of gear ratio setting processing according to the embodiment of the present invention. Step S5-1: Select a shift speed. Step S5-2: Input the set gear ratio. Step S5-3: It is judged whether or not the set gear ratio falls within an appropriate range. If the set gear ratio falls within the proper range, the process proceeds to step S5-4, and if not, the process returns to step S5-2. Step S5-4: It is judged whether or not the input of the gear ratio is completed. If the input of the gear ratio has been completed, the processing is terminated. If the input of the gear ratio has not been completed, step S5.
Return to -1.

Next, the subroutine of the gear ratio storing process in step S6 of FIG. 6 will be described. FIG. 10 is a flowchart of a subroutine of gear ratio storing processing according to the embodiment of the present invention. Step S6-1: Set the gear ratio to RAM 252
It is determined whether or not to store in (FIG. 1). To store the set gear ratio in the RAM 252, step S6-2
If not stored, the process ends. Step S6-2 The gear ratio is stored.

[0056]

As described in detail above, according to the present invention, in a continuously variable transmission, a continuously variable transmission that performs gear shifting at a continuously variable gear ratio and a gear ratio of the continuously variable transmission are provided. An actuator to be changed, a stepped speed change instruction means for instructing stepped speed change of upshift and downshift, a stepped speed change step, and a storage means storing a speed change ratio corresponding to the stepped speed change step. , Based on an instruction of the stepped gear shift instruction means, a gear ratio is read from the storage means, and the actuator is actuated to operate the actuator in accordance with the gear ratio, an input means, and an operation of the input means. And a gear ratio setting means for setting a gear ratio corresponding to each stepped gear.

In this case, when the driver gives an instruction for upshifting and downshifting, the gear ratio is read from the storage means, the actuator is operated in correspondence with the gear ratio, and the continuously variable transmission is operated. The gear ratio is changed. Therefore, since the gear ratio corresponding to each gear can be set, the driver can drive the vehicle in an appropriate gear shift pattern.

Further, it is possible to drive the vehicle in a shift pattern according to the driver's preference. Another continuously variable transmission according to the present invention further includes an appropriate gear ratio setting means for keeping each gear ratio set by the gear ratio setting means within an appropriate range. In this case, each set gear ratio falls within an appropriate range, so that it is possible to prevent the engine from causing an engine storm or causing an over-revolution.

In still another continuously variable transmission according to the present invention, the appropriate gear ratio setting means compares the gear ratios of adjacent gears among the gear ratios set by the gear ratio setting means. To do. In this case, it is possible to set each speed ratio set within an appropriate range according to the engine speed at the time of performing the upshift and the downshift.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram of a continuously variable transmission according to an embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram of the continuously variable transmission according to the embodiment of the present invention.

FIG. 4 is a block diagram of a control device for a continuously variable transmission according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a speed selecting device according to an embodiment of the present invention.

FIG. 6 is a flowchart of a main routine showing an operation of the continuously variable transmission according to the embodiment of the present invention.

FIG. 7 is a diagram showing a display example of a display panel in the embodiment of the present invention.

FIG. 8 is a flowchart of a subroutine of mode input processing according to the embodiment of the present invention.

FIG. 9 is a flowchart of a subroutine of gear ratio setting processing according to the embodiment of the present invention.

FIG. 10 is a flowchart of a subroutine of gear ratio storage processing according to the embodiment of the present invention.

[Explanation of symbols]

 11 continuously variable transmission 12 continuously variable transmission 43 hydraulic actuator 252 RAM 254 actuator operating means 301 shift lever 451 display panel 452 operation panel 460 gear ratio setting means

Claims (3)

[Claims] 1. A continuously variable transmission that performs gear shifting at a continuously variable transmission ratio, an actuator that changes the gear ratio of the continuously variable transmission, and a stepped transmission that directs stepped upshifting and downshifting. An instructing means, a stepped speed change step, and a storage means storing a speed change ratio corresponding to the stepped speed change step; and a speed change ratio read from the storage step based on an instruction from the stepped speed change instruction means, It has an actuator actuating means for actuating the actuator in accordance with the gear ratio, an input means, and a gear ratio setting means for setting a gear ratio corresponding to each stepped gear based on an operation of the input means. A continuously variable transmission characterized in that 2. The continuously variable transmission according to claim 1, further comprising an appropriate gear ratio setting unit for keeping each gear ratio set by the gear ratio setting unit within an appropriate range. 3. The continuously variable transmission according to claim 2, wherein the proper gear ratio setting means compares the gear ratios of adjacent gears among the gear ratios set by the gear ratio setting means.