JPS61115736A - Control unit of power transmission system for vehicles - Google Patents

Abstract

PURPOSE:To make a car drivable as a driver's intention even against every car driving condition, by making a stepless shift controllable according to a driver's intention by means of manual operation. CONSTITUTION:A V-belt stepless transmission 21 constitutes a stepless shift 2 capable of shifting a torque ratio to being stepless. An input engine speed variable range setting device 3, being operated by a driver, optionally sets an input engine speed variable range of the stepless shift 2. A torque ratio controlling device 4 properly controls a torque ratio of the V-belt stepless transmission 21. According to an M range setting position of a shift lever, the input engine speed variable range in the V-belt stepless transmission 21 is made settable in an optional manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a vehicle power transmission device equipped with a continuously variable transmission.

[Prior Art] Conventionally, a control device for a vehicle power transmission device equipped with a continuously variable transmission has a drive (D) which is a so-called automatic transmission range that automatically changes the torque ratio according to vehicle running conditions.
range and low (L) range for engine braking.
In the D range, for example, in order to perform the best fuel efficiency control, the torque ratio of the continuously variable transmission is changed from the maximum torque ratio to the minimum torque ratio to achieve the best fuel economy rotation speed of the engine according to the throttle opening. In the L range, the torque ratio of the continuously variable transmission is forcibly downshifted to provide engine braking.

[Problems to be Solved by the Invention] However, in the case of the vehicle power transmission device having the above configuration, in the case of the D range, the gears are automatically shifted in a certain predetermined pattern depending on the vehicle driving conditions, so that the driver's It does not necessarily fully reflect the driver's intentions, and depending on the driver, the feeling provided may not be the best.

For example, when a vehicle is driving on a mountain road, the accelerator pedal is turned on and off, resulting in frequent gear changes that reduce drivability, and when accelerating for overtaking, upshifting occurs against the driver's will, so it is difficult to I can't get enough acceleration. Also, in the case of the L range, only one predetermined engine braking pattern can be selected, and it is not possible to obtain engine braking appropriate for all driving conditions.

An object of the present invention is to provide a control device for a power transmission device for a vehicle that enables driving according to the driver's will because the continuously variable transmission can be controlled according to the driver's will by manual operation. .

[Means for Solving the Problems] A control device for a vehicle power transmission device of the present invention is a vehicle power transmission device equipped with a continuously variable transmission device that can continuously change a torque ratio. signals from an input rotation speed variable range setting means for arbitrarily setting the input rotation speed variable range of the continuously variable transmission; and a detection means for detecting vehicle running conditions within the input rotation speed variable range set by human operation. The present invention further includes a torque ratio control means for appropriately controlling the torque ratio of the continuously variable transmission according to the above.

[Operations and Effects of the Invention] With the above configuration, the control device for a vehicle power transmission device of the present invention has the following operations and effects.

b) Manual gear shifting is possible according to the driver's will.

Since the input rotation speed variable range can be set steplessly, the vehicle can be driven according to the driver's will under all vehicle driving conditions. For example, when driving downhill, the input rotation speed can be selected depending on the gradient of the downhill slope, so that the engine braking effect can be achieved as desired by the driver. Similarly, an appropriate input rotation speed can be selected when pitching or accelerating.

c) When starting, the vehicle can start with the maximum torque ratio regardless of the setting position of the input rotation speed variable range setting means.

2) During engine braking, the driver can obtain a smooth engine braking condition according to the vehicle speed by simply setting the minimum value of the input rotation speed, and the torque ratio increases as the vehicle speed decreases.

e) When the vehicle is traveling on mountain roads, etc., the minimum value of the input rotation speed can be set using the input rotation speed variable range setting means, so the torque ratio can be selected according to the vehicle speed, and the speed change in response to changes in throttle opening is restricted, allowing the driver f) By sequentially changing the setting of the minimum value of the input rotation speed using the input rotation speed variable range setting means, the torque ratio to the vehicle speed can be limited, making it possible to drive manually, and at the same time Automatic gear shifting is also possible within the input rotation speed variable range.

[Embodiment] A control device for a vehicle power transmission device according to the present invention will be described based on an embodiment shown in the drawings.

1 to 7 show a first embodiment of a control device for a vehicle power transmission device according to the present invention.

The control device 1 of the vehicle power transmission device includes a V-belt type continuously variable transmission 21 which is a continuously variable transmission 2 that can change the torque ratio steplessly, and an input of the continuously variable transmission 2 operated by the driver. It is provided with input rotation speed variable range setting means 3 for arbitrarily setting the rotation speed variable range, and torque ratio control means 4 for appropriately controlling the torque ratio of the V-belt type continuously variable transmission 21.

The V-belt type continuously variable transmission 21 includes an input shaft 22, an output shaft 23 arranged parallel to the input shaft 22, a fixed flange 24a and a movable flange 2 that are integrally formed with the input shaft 22.
4b, and an input pulley 24 which is an input member of the belt type continuously variable transmission 1121; Consisting of an output pulley 25 which is an output member, and a belt 26 stretched between the input pulley 24 and the output pulley 25, the input pulley 24 has a 7-shaped groove 248 and the output pulley 25 has a V-shaped groove. Groove 25A
By controlling the interval between the two, the torque ratio can be made steplessly variable.

The input rotation speed variable range setting means 3 includes shift levers 6 and M having respective setting positions consisting of a parking (P) range, a reverse (R) range, a neutral (N) range, and a manual (M) range which is a manual shift range. The M range of the shift lever 6 is installed in the range and outputs a signal indicating the minimum rotation speed (Niin) <Fig. 5.6) in the input rotation speed variable range from any set old gh to Low. Potentiometer 3 that responds to movement within
1, and a minimum rotation speed detection device 32 that detects the minimum rotation speed (N m1n) based on the electrical signal of the potentiometer 31.
It consists of 5 and 6 are diagrams showing the relationship between the shift lever stroke and the set minimum rotation speed, and FIG. 5 shows the case where the set minimum rotation speed is set steplessly with respect to the shift lever stroke. FIG. 6 shows a case where the set minimum rotation speed is set in multiple stages with respect to the shift lever stroke.

The torque ratio control means 4 uses the engine speed (NE) from the engine speed sensor 41A and the throttle opening sensor 4.
A table rotation speed setting device 41 that determines the table rotation speed (Nt) in advance in accordance with vehicle running conditions such as the throttle opening (θTH) from the cooling water temperature sensor 41C and the cooling water temperature (Tw) from the cooling water temperature sensor 41C; The set minimum rotation speed (Nmin) signal from the number detection device 32 and the table rotation speed (Nt) from the table rotation speed setting device 41 are input, and the table rotation speed (Nt) and the set minimum rotation speed (N m1n) are input.
When the set minimum rotation speed (N 1llin) is greater than or equal to the table rotation speed (Nt), the set minimum rotation speed (N
m1n) is the target rotation speed, and the set minimum rotation speed (Nmin
) is smaller than the table rotation speed (Nt), a target rotation speed setting device 43 that sets the table rotation speed as the target rotation speed;
The target rotation speed and the input pulley rotation speed (Ni) from the input pulley rotation speed sensor 42 are compared, and if the rotation speed difference [(target rotation speed) - (input pulley rotation speed)] is larger than a predetermined value, ■ A downshift signal is output that increases the torque ratio of the belt type continuously variable transmission 21, and when the rotation speed difference [(target rotation speed) - (input pulley rotation speed)] is smaller than zero, ■ Belt type continuously variable transmission 21, and when the rotational speed difference [(target rotational speed) - (input pulley rotational speed)] is greater than or equal to zero and less than a predetermined value, A shift signal generator 45A that outputs a maintenance signal to maintain the torque ratio at the current torque ratio, and a V-shaped groove 2 of the input pulley 24 and output pulley 25 in response to the output signal of the shift signal generator 45A.
Pulley controller 46 that controls the interval between 4A and 25A
It consists of

The operation of this embodiment will be explained based on FIGS. 2 to 6.

FIG. 2 shows an operation flowchart of this embodiment.

Turn the starter key ON, start the engine <10
1), Set the initial value (102), Input the set position (shift position) signal of the shift lever 6.103L Enter the engine speed (NE
), throttle opening (θT) from throttle opening sensor 41B, cooling water temperature from cooling water temperature sensor 41C (
Input the vehicle running conditions such as Tw) 104) and the input pulley rotation speed (Ni) from the input pulley rotation speed sensor 42.
105), and the set minimum rotation speed (Nmin) from the minimum rotation speed sensor 32 of the input rotation speed variable range setting means 3.
106), and set whether the shift position is P range, R range, N range, or M range.
07), when in the P range, executes the P range control subroutine (108), and then returns to (103).

When in the R range, perform the R range control subroutine (109), then return to (103), and when in the N range, perform the N range control subroutine (110).
), then returns to (103), executes the M range control subroutine when in M range (111), and then returns to (103). .

FIG. 3 shows the P, R, N range subroutine.

Output a signal to maintain the maximum torque ratio (121), and (1) maintain the belt type continuously variable transmission at the maximum torque ratio.

FIG. 4 shows the M range subrange.

From the M range table shown in Fig. 10, the input pulley rotation speed (
Nt)131), (minimum set rotation speed) - (
132) When A<0, set the table rotation speed as the target rotation speed.133) When A≧O, set minimum rotation speed. The number is set as the target rotation speed (138). Next, (target rotation speed) - (input pulley rotation speed) = 8, is H<8, B<O, 0≦B≦
134) When H<8, a downshift signal should be output to the pulley controller 46.13
5) Downshift the V-belt valor stage gear ta21. When Boo, an upshift signal is output to the pulley controller 46. 136) The V-belt continuously variable transmission 21 is upshifted. When 0≦B≦H, a signal for maintaining the current torque ratio is output to the pulley controller 46 (137), and the V-belt type continuously variable transmission 21 is maintained at the current torque ratio. Here, H means a predetermined value for setting hysteresis, which is the range within which the current torque is maintained without changing gears in order to prevent the feeling from becoming worse due to frequent repetition of upshifts and downshifts. has been established.

7 to 9 show a second embodiment of a control device for a vehicle power transmission device according to the present invention.

FIG. 7 shows a block diagram of this embodiment.

The torque ratio control means 4 uses the engine speed (NE) from the engine speed sensor 41^ and the throttle opening sensor 4.
The table rotation speed (NO and the output from the output pulley rotation speed sensor 44 Pulley rotation speed (No.
) and a table torque ratio calculation device 47 that calculates the table torque ratio (it), and a minimum rotation speed detection device 3.
The minimum rotation speed (Nmin) from 2 and the output pulley rotation speed (NO) from the output pulley rotation speed sensor 44 are input to calculate the set torque ratio, and the set torque ratio and the table from the table torque ratio calculation device 47 are input. input the torque ratio (it), and when the ratio of the table torque ratio (;1) to the set torque ratio is less than 1, the set torque ratio is set as the target torque ratio, and the ratio of the table torque ratio (it) to the set torque ratio is set as the target torque ratio. A target torque ratio setting device 48 that sets the table torque ratio (it) as the target torque ratio when it is larger than 1, and the target torque ratio from the target torque ratio setting device 48 and the input boolean rotation of the V-belt continuously variable transmission 21. Input the current torque ratio (i) from the current torque ratio sensor 49 that detects the current torque ratio (i) from the output pulley rotation speed (No) and the target torque ratio of the current torque ratio (i). When the ratio is smaller than a predetermined value smaller than 1, a downshift signal is output that increases the torque ratio of the V-belt continuously variable transmission 21, and when the ratio is 1 or more, the torque ratio of the V-belt continuously variable transmission 21 is output. outputs an upshift signal that decreases the current torque ratio (
1) Shift signal generator that outputs a maintenance signal to maintain
45B, and the pulley controller 46.

FIG. 8 shows an operation flowchart of this embodiment.

Turn the starter key ONL, start the engine (3
01), Set the initial value 302), Input the setting position (shift position) signal of the shift lever 6 303)
, the engine speed from the engine speed sensor 41A (
, NE), the vehicle running conditions such as the throttle opening (θTH) from the throttle opening sensor 41B, and the cooling water temperature (Tw) from the cooling water temperature sensor 41C (304), and the input pulley from the input pulley rotation speed sensor 42. Number of rotations (N
Please enter i) 305. ), output pulley rotation speed sensor 4
Please input the output pulley rotation speed (NO) from 4 (306).
, the minimum rotation speed sensor 3 of the input rotation speed variable range setting means 3
Please enter the set minimum rotation speed (N m1n) from 2 307
), set whether the shift position is P range, R range, N range, or M range (308), and when in P range, execute the P range control subroutine (309).
, then returns to (303). When in the R range, performs the R range control subroutine (310), then returns to (303), and when in the N range, performs the N range control subroutine (311), then (303)
When the M range is selected, the M range control subroutine is executed (312), and then the process returns to <303).

FIG. 9 shows the M range subroutine of this embodiment.

Input pulley rotation speed (Ni) and output pulley rotation speed (NO)
Calculate the current torque ratio (i) from 331), calculate the set torque ratio from the set minimum rotation speed and output pulley rotation speed.332), calculate the table rotation corresponding to the throttle opening from the M range table shown in Fig. 10. Read the number and calculate the table torque ratio (it) from the output pulley rotation speed.
Calculate 333) , (Table torque ratio) / (Set torque ratio) = Judge whether C is C50 or C>1 3
34), When C50, set the torque ratio as the target torque ratio. 335) When C>1, set the table torque ratio as the target torque ratio (336), then (current torque ratio)/(target torque ratio) = C is X>D, D≧1, or X≦D<1
337) and output a downshift signal to the pulley controller 46 when X>D. 338) to downshift the V-belt type continuously variable transmission 21. When D≧1, an upshift signal is output to the pulley controller 46 (339), and the V-belt continuously variable transmission 21 is upshifted.

When X≦D<1, a signal for maintaining the current torque ratio is output to the pulley controller 46 (340), and the V-belt type continuously variable transmission 21 is maintained at the current torque ratio.

Here, X means a hysteresis coefficient, and in order to prevent the feeling from worsening due to frequent upshifts and downshifts, the range in which the current torque ratio is maintained without shifting is determined. There is.

As described above, the present invention allows the input rotational speed variable range of the V-belt type continuously variable transmission 21 to be arbitrarily set according to the M range setting position of the shift lever.

For example, if you select the 8 points shown in Figure 6 using the shift lever,
Is the input port/rotation speed variable range input rotation speed N1 to N? The range is set to . Shifting within the range of the input rotational speed N1 to N2 is performed automatically according to the speed change number preset according to the M range table.

If the minimum rotation speed of the input rotation speed variable range is set to increase sequentially, and the shift lever is operated sequentially from the side with the higher minimum rotation speed to the side with the lower minimum rotation speed, the V-belt continuously variable transmission will be activated. 21 manual shifting is possible. Also, if you select the shift lever to the side with the lower minimum rotation speed,
It is possible to perform automatic gear change according to the degree of depression of the accelerator pedal, like a normal V-belt type continuously variable transmission 21.

[Brief explanation of drawings]

FIG. 1 shows a first control device for a vehicle power transmission device according to the present invention.
A block diagram of an embodiment, FIG. 2 is an operation flowchart of a first embodiment of a control device for a vehicle power transmission device of the present invention, and FIG. 3 is a first embodiment of a control device for a vehicle power transmission device of the present invention. 4 shows the M range subroutine of the first embodiment of the control device for the vehicle power transmission device of the present invention, and FIGS. 5 and 6 show the vehicle power transmission device of the present invention. 7 is a block diagram of the second embodiment of the control device for a vehicle power transmission device of the present invention, and FIG. 8 is a graph showing the relationship between the shift lever stroke and the set minimum rotation speed of the control device of the present invention. FIG. 9 is an operation flowchart of a second embodiment of a control device for a power transmission device according to the present invention, and FIG.
The figure is a graph showing the relationship between the throttle opening degree and the table rotation speed, which is the M range table of the control device for the vehicle power transmission device of the present invention.

Claims (1)

[Scope of Claims] 1) In a vehicle power transmission system equipped with a continuously variable transmission capable of continuously changing a torque ratio, the input rotation speed variable range of the continuously variable transmission can be arbitrarily changed by manual operation. Appropriately control the torque ratio of the continuously variable transmission according to signals from a variable input rotational speed range setting means to be set and a detection means for detecting vehicle running conditions within the variable input rotational speed range set by manual operation. 1. A control device for a power transmission device for a vehicle, characterized in that a torque ratio control means is provided. 2) The vehicle power according to claim 1, wherein the input rotation speed variable range is provided such that the minimum rotation speed of the input rotation speed variable range increases sequentially. Transmission device control device. 3) The input rotation speed variable range setting means outputs a set minimum rotation speed signal of the input rotation speed variable range in any input rotation speed variable range set by manual operation, and the torque ratio control means: A table rotation speed signal predetermined in accordance with the vehicle running condition signal is compared with the set minimum rotation speed signal, and when the set minimum rotation speed signal is greater than or equal to the table rotation speed signal, the set minimum rotation speed signal is set as the target rotation. a target rotation speed setting device that uses a table rotation speed signal as a target rotation speed signal when a set minimum rotation speed signal is smaller than a table rotation speed signal; and an input member from the input member rotation speed sensor of the continuously variable transmission. The rotational speed signal and the target rotational speed signal are compared, and if the rotational speed difference [(target rotational speed) - (input member rotational speed)] between the input member rotational speed signal and the target rotational speed signal is larger than a predetermined value, the Outputs a downshift signal that increases the torque ratio of the continuously variable transmission, and the rotational speed difference [(target rotational speed) - (input member rotational speed)] between the input member rotational speed signal and the target rotational speed signal is smaller than zero. Sometimes, an upshift signal is output that reduces the torque ratio of the continuously variable transmission, and the rotation speed difference [(target rotation speed) - (input member rotation speed)] between the input member rotation speed signal and the target rotation speed signal is zero. and a shift signal generator that outputs a maintenance signal to maintain the torque ratio of the continuously variable transmission at the current torque ratio when the torque ratio is below a predetermined value; 2. The control device for a vehicle power transmission device according to claim 1, comprising a controller that controls a torque ratio between an input member and an output member. 4) The input rotation speed variable range setting means outputs a minimum input rotation speed signal in the input rotation speed variable range in an arbitrary input rotation speed variable range set by manual operation, and the torque ratio control means: The output member rotational speed signal from the output member rotational speed sensor of the continuously variable transmission device and the minimum input rotational speed signal are input, a set torque ratio is calculated, and the table rotational speed is predetermined according to the vehicle running conditions. A table torque ratio calculation device inputs the signal and the output member rotation speed signal and calculates the table torque ratio, and a table torque ratio calculation device inputs the table torque ratio signal and the set torque ratio signal, and calculates the ratio of the table torque ratio to the set torque ratio. A target torque ratio setting device that uses the set torque ratio as the target torque ratio when the ratio is 1 or less, and uses the table torque ratio as the target torque ratio when the ratio of the table torque ratio to the set torque ratio is greater than 1, and the current status of the continuously variable transmission device inputting the current torque ratio signal from the current torque ratio sensor that detects the torque ratio and the target torque ratio signal;
When the ratio of the current torque ratio to the target torque ratio is smaller than a predetermined value smaller than 1, a downshift signal is output that increases the torque ratio of the continuously variable transmission, and when the ratio of the current torque ratio to the target torque ratio is 1 or more, a downshift signal is output. Outputting an upshift signal to reduce the torque ratio of the continuously variable transmission, and maintaining the torque ratio of the continuously variable transmission at the current torque ratio when the ratio of the current torque ratio to the target torque ratio is greater than or equal to a predetermined value and smaller than 1. and a controller that controls the torque ratio between the input member and the output member of the continuously variable transmission according to the output signal of the shift signal generator. A control device for a vehicle power transmission device according to claim 1. 5) The continuously variable transmission device includes an input pulley, an output pulley, and a V-belt stretched between the input pulley and the output pulley, and the V-shaped groove spacing of the input pulley and output pulley is adjusted to the torque ratio. A control device for a vehicle power transmission device according to claim 3 or 4, characterized in that the control device is a V-belt type continuously variable transmission controlled by a control means and whose torque ratio is continuously variable. .