JPS61115734A - 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 driving condition, by controlling a torque ratio of a stepless shift according to the setting position of a torque ratio controlling device with a torque ratio variable range setting device. CONSTITUTION:A stepless shift 2 makes a torque ratio shiftable in succession. A torque ratio variable range setting device 3 sets a torque ratio variable range to being stepless by means of manual operation. A torque ratio controlling device 4 controls a torque ratio of the stepless shift 2 according to the setting position of the torque ratio variable range setting device 3. According to a manual range setting position of the shift lever 6, a torque ratio variable range of a V-belt stepless transmission 21 is made selectable in an optional manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a control device for a vehicle power transmission device equipped with a continuously variable transmission.

[Prior Art] In the control of a vehicle power transmission system equipped with a conventional continuously variable transmission, there is a so-called automatic transmission D range that automatically changes the torque ratio according to the driving condition of the vehicle, and an engine brake. In the D range, for example, the torque ratio of the continuously variable transmission is automatically adjusted to achieve the engine's best fuel consumption speed according to the throttle opening, so as to perform optimal fuel efficiency control. is controlled. In addition, in the range, the torque ratio of the continuously variable transmission is forcibly downshifted to provide engine braking.

[Problems to be Solved by the Invention] However, the continuously variable transmission device having the above configuration automatically shifts gears in a certain predetermined pattern depending on the driving condition of the vehicle when in the D range. 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 driving on a mountain road, gears are shifted frequently as the accelerator is turned on and off, resulting in a poor feeling, and when accelerating for overtaking, the gears shift automatically against the driver's will. ,
Not getting 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.

The present invention provides a torque ratio variable range setting means that can continuously set the torque ratio variable range of a continuously variable transmission in a stepless or multi-step manner by manual operation. A control device for a power transmission device for a vehicle is provided with a shift lever that can select any torque ratio variable range in multiple stages, thereby making it possible to control a continuously variable transmission device according to the driver's will. The purpose is to provide.

[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. a torque ratio variable range setting means for arbitrarily setting the torque ratio variable range of the continuously variable transmission; and a torque ratio variable range setting means for setting the torque ratio variable range of the continuously variable transmission according to the setting position of the torque ratio variable range setting means and vehicle running conditions. and torque ratio control means for controlling the torque ratio control means.

[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.

The torque ratio variable range setting means arbitrarily sets the torque level by manual operation, and the torque ratio control means controls the torque ratio of the continuously variable transmission according to the setting position of the torque ratio variable range setting means. ) Manual gear shifting is possible according to the driver's preference.

Since the torque ratio variable range can be set continuously, it is possible to drive according to the driver's will in all driving conditions. For example, when driving downhill, the torque ratio can be selected depending on the gradient of the downhill slope, so the engine braking effect can be achieved as desired by the driver. Similarly, an appropriate torque ratio can be selected when climbing or accelerating.

C) When only the minimum torque ratio is limited, no matter what position the lever is in, the vehicle can always start with the maximum torque ratio.

2) By manually changing the set value of the minimum torque ratio in the variable torque ratio range from time to time, manual gear shifting is possible, and at the same time, automatic gear shifting is also possible within the set variable torque ratio range.

e) When the vehicle speed is high, engine braking is applied while maintaining the set minimum torque ratio, and when the vehicle speed decreases, coasting is performed.

f) When starting, by limiting the maximum torque ratio, an arbitrary torque ratio can be obtained, allowing smooth starting even when the friction coefficient of the road surface is low, such as on a snowy road.

g) When stopped, the maximum torque ratio can be controlled and the creep force can be adjusted.

H) Torque can be set when driving on mountain roads, etc.
Since it is possible to limit the speed change due to changes in throttle opening,
Good feeling.

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

1 to 6 show a first embodiment of a control device for a vehicle power transmission device according to the present invention.

FIG. 1 shows a first control device for a vehicle power transmission device according to the present invention.
FIG. 2 is a block diagram of an embodiment.

In this embodiment, a control device 1 for a vehicle power transmission device according to the present invention includes a continuously variable transmission device 2 that can continuously change the torque ratio, and a continuously variable transmission device 2 that can continuously change the torque ratio. It consists of a ratio variable range setting means 3 and a torque ratio control means 4 that controls the torque ratio of the continuously variable transmission @2 according to the setting position of the torque ratio variable range setting means 3.

In this embodiment, the continuously variable transmission 2 is a V-belt continuously variable transmission 21, and the V-belt continuously variable transmission 21 has an input shaft 2.
2. An output shaft 23 arranged parallel to the input shaft 22, a fixed flange 24a provided on the input shaft 22 and integrally formed with the input shaft 22, and a movable flange that slides on the input shaft 22 in the axial direction. V-belt type continuously variable transmission 2 with 24b
1 input member, a fixed flange 25 provided on the output shaft 23 and integrally formed with the output shaft 23.
a and a movable flange 25b that slides on the output shaft 23 in the axial direction. The belt 26 controls the interval between the V-shaped grooves 24A and 25A of the input pulley 24 and the output pulley 25 so that the torque ratio can be varied steplessly.

The torque ratio variable range setting means 3 includes parking (P), reverse (R), neutral (N), and manual (M).
The manual (M) setting position of the shift lever 6 is from old GH to L.
It is capable of reciprocating sliding up to OW, and the movement of the shift lever 6 at the manual setting position is transmitted to a potentiometer 31, and has a minimum torque ratio sensor 32 that detects the minimum torque ratio (Tmin) based on the potential difference of this potentiometer 31. . 5 and 6 are diagrams showing the relationship between the shift lever stroke and the minimum torque ratio.
The figure shows the case where the minimum torque ratio is set steplessly with respect to the shift lever stroke, and FIG. 6 shows the case where the minimum torque ratio is set steplessly with respect to the shift lever stroke.

The torque ratio control means 4 inputs the minimum torque ratio (Tmin) signal from the minimum torque ratio sensor 32 and the output pulley rotation speed (No) from the output pulley rotation speed sensor 41, and controls the set rotation speed of the input pulley. The engine speed (NE) signal from the engine speed sensor 42A and the throttle opening (θTH) from the throttle opening sensor 42B are calculated.
signal, the table rotation speed (NO) from the table rotation speed setting device 44 which sets a predetermined table rotation speed (Nt) in response to the cooling water temperature (Tv) signal from the cooling water temperature sensor 42C, and the set rotation speed. A target rotation speed setting device 45 that sets the set rotation speed as the target rotation speed when the set rotation speed is larger than the table rotation speed, and sets the table rotation speed as the target rotation speed when it is smaller, and a target rotation speed and input pulley rotation. The input pulley rotation speed (Ni) from the number sensor 43 is compared, and when the rotation speed difference is larger than a predetermined value, a downshift signal is output that increases the torque ratio of the V-belt continuously variable transmission 21, and the rotation When the difference in the number of revolutions is smaller than zero, an upshift signal is output that reduces the torque ratio of the V-belt continuously variable transmission 21, and when the difference in the number of revolutions is greater than zero and less than a predetermined value, an upshift signal is output that reduces the torque ratio of the V-belt continuously variable transmission 21. A shift signal generator 46A outputs a signal to maintain the torque ratio at the current torque ratio, and the interval between the V-shaped grooves 24A and 25A of the input pulley 24 and the output pulley 25 is controlled according to the output signal of the shift signal generator 46A. and a pulley controller 47.

FIG. 2 shows an operation flowchart of the first embodiment of the vehicle power transmission device of the present invention.

Turn the starter key ON and start the engine (10
1), perform initial value setting (102), input the shift position signal of the shift lever 6 (103), input the throttle opening (θ■11) from the throttle opening sensor 42B (104), and detect the input pulley rotation speed. Input the input pulley rotation speed (Ni) from the device 43 (105) and the output pulley rotation speed (No. 105) from the output pulley rotation speed detection device @41.
) 106), input the minimum torque ratio from the torque ratio variable range setting means 3 107), and judge whether the shift position of the shift lever 6 is P, R, N, or M 108
), when in the P range, performs the P range control subroutine (109), and then returns to (103). When in R range, perform N range control subroutine (
110), then returns to (103), and when in N range,
Executes the N range control subroutine (111),
After that, the process returns to (103), and when the M range is selected, the M range control subroutine is executed (112), and then (1
Return to 03).

FIG. 3 shows the first control device of the vehicle power transmission device of the present invention.
The P, R, N range subroutine of the embodiment is shown.

The P, R, N range subroutine outputs a signal to maintain the maximum torque ratio (121), and (1) maintains the torque ratio of the belt type continuously variable transmission at a maximum of 1 to the torque ratio.

FIG. 4 shows the first control device of the vehicle power transmission device of the present invention.
The N range subroutine of the embodiment is shown. Shift lever 6
Calculate the set input rotation speed from the set minimum torque ratio and the output pulley rotation speed (NO) from the output pulley rotation speed detection device 41 (131), which corresponds to the throttle opening from the M range table (Figure 7). Determine the table rotation speed of the coupler (132), (set input rotation speed)
- (Table rotation speed) = Judge whether A is A>O or A≦O133), When A≦0, set the table rotation speed as the target rotation speed134), When Ago, set force rotation speed as the target rotation speed. number. Here, while driving at high speed with a small torque ratio, if the set minimum torque ratio set by the driver's downshift operation is large, the target set input rotation speed may exceed the engine's allowable rotation speed. This may cause the engine to overrun. Therefore, the set input rotation speed is compared with the maximum value of the target rotation speed set near the allowable engine rotation speed, and the difference (set input rotation speed) - (maximum value of the target rotation speed) = C is Coo? To judge whether it is C50 139), if C50, set the input rotation speed as the target rotation speed 141), if C>O, set the maximum value of the target rotation speed as the target rotation speed 140), and if the target rotation speed is Engine overrun is prevented by ensuring that the engine speed does not exceed the allowable engine speed. Next, (target rotation speed) - (
Input pulley rotation speed) -8 is H<B or B<0 or O≦B≦
135) to determine if H<B, output a downshift signal to the pulley controller 47 136) to downshift the V-belt type continuously variable transmission 21. When Boo, an upshift signal is output to the pulley controller 47 (137), and the V-belt type continuously variable transmission 21 is upshifted. When O≦B≦H, a signal to maintain the current torque ratio (i) is output to the pulley controller 47 (138), and the current torque ratio of belt bottom continuously variable speed g% 21 is maintained. Here, H means a predetermined value to provide hysteresis, and in order to prevent the feeling from worsening due to frequent repetition of upshifts and downshifts, the current torque ratio is maintained without changing gears. The scope of maintenance is determined.

FIG. 7 is a diagram showing the relationship between the table rotation speed and the throttle opening, and the table rotation speed is determined to obtain the best fuel efficiency or the maximum power.

FIG. 8.9 shows a second embodiment of the control device for a vehicle power transmission device according to the present invention.

The torque underground setting means 3 is provided with a minimum torque ratio sensor 32 that detects the minimum torque ratio Hmin) based on the potential difference of the potentiometer 31, and the torque ratio control means 4 is configured to detect the engine speed (NE) from the engine speed sensor 42A.
) signal, the throttle opening (θTH) signal from the throttle opening sensor 42B, the cooling water temperature (Tw) signal from the cooling water temperature sensor 42C, and the table rotation speed (Fig. 7) determined in advance, and the output. A table torque ratio setting device 48 that calculates a table torque ratio (IT) by comparing the output pulley rotation speed (NO) signal from the pulley rotation speed sensor 41, and a table torque ratio from the table torque ratio setting device 48. (1t) Signal and minimum torque ratio sensor 3
Input the minimum torque ratio (Tmin) signal from 2 and
A target torque ratio setting device 49 that sets the minimum torque ratio as the target torque ratio when the ratio of the table torque ratio to the minimum torque ratio is 1 or less, and sets the table torque ratio as the target torque ratio when the ratio is greater than 1; and the current torque ratio (i) from the current torque ratio sensor 42, and when the ratio is smaller than a predetermined value smaller than 1, V
Outputs a downshift signal that increases the torque ratio of the belt type continuously variable transmission 21, and outputs an upshift signal that decreases the torque ratio of the V-belt type continuously variable transmission 21 when the ratio is 1 or more, It consists of a shift signal generator 46A that outputs a signal to maintain the torque ratio of the V-belt type continuously variable transmission 21 at the current torque ratio (i) when the value is greater than or equal to a predetermined value and smaller than 1, and the pulley controller 47.

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

Input pulley rotation speed (Ni) and output pulley rotation speed (NO)
The current torque ratio (1) is calculated from (301).

If the set minimum torque ratio selected by the driver is larger than the maximum allowable torque ratio that can be achieved at the current vehicle speed, the input pulley rotation speed will exceed the engine's allowable rotation speed.
There is a danger that the engine will overrun. Therefore,
Calculate the maximum allowable torque ratio that can be achieved at the current vehicle speed from the output pulley rotation speed (NO) and the maximum allowable input pulley rotation speed that is set around the engine's allowable rotation speed (302), M
Read the table rotation speed corresponding to the throttle opening from the range table, and calculate the table torque ratio (it) from the output pulley rotation speed. 303), (Table torque ratio) / (Minimum set torque ratio) = D is 1≧ To judge whether D or D>1 304), when 1≧D, to judge whether (minimum set torque ratio)/(maximum allowable torque ratio) = F is F>1 or F≦1 310), When F≦1, the set minimum torque ratio is set as the target torque ratio 312), when F>1, the maximum allowable torque ratio is set as the target torque ratio 311), and the maximum allowable torque ratio that the target torque ratio can take at the current vehicle speed. The engine overrun is prevented by preventing the hecapulley rotation speed from exceeding the engine's allowable rotation speed. When D>1, set the table torque ratio as the target torque ratio and set it as 3.
05), (current torque ratio)/(target torque ratio) = E is,
Please judge whether X>E, X≦E<1 or E≧1306),
〉At the time of Snake, a downshift signal is output to the pulley controller 47. 307), ■ The belt type continuously variable transmission 21 is downshifted. When X≦E<1, a signal to maintain the current torque ratio (i) should be output to the pre-controller 47.3
08), ■ Maintain the current torque ratio of the belt type continuously variable transmission 21. Pulley controller 4 when E≧1
(309) to cause the belt type continuously variable transmission 21 to upshift. Here, X means a coefficient for hysteresis, and in order to prevent the shift from upshift 1 to downshift from being repeated frequently and worsening the feeling, the range within which the current torque ratio is maintained without shifting. has been established.

As described above, the present invention allows the torque ratio variable range of the belt bottom continuously variable transmission lever 21 to be arbitrarily selected depending on the M range setting position of the shift lever.

For example, when eight points shown in FIG. 6 are selected using the shift lever, the torque ratio variable range is set to the range of torque ratios T1 to T2. Shifting within the range of torque ratios T1 to T2 is performed by J shifting according to a shift line predetermined according to the M range table. If the minimum torque ratio side of the torque ratio variable range is set to increase sequentially as shown in the figure, by operating the shift lever sequentially from the side with a large minimum torque ratio to the side with a small minimum torque ratio, Manual gear shifting with a step-shifting feel is possible.

Furthermore, by selecting the shift lever to the side with the smaller minimum torque ratio, it becomes possible to automatically shift gears according to the degree of depression of the accelerator, similar to normal continuously variable transmission. Also, if the maximum torque ratio side of the torque ratio variable range is decreased (Part A in Figure 6)
, it becomes possible to start with low torque, making it suitable for starting on snowy roads.

[Brief explanation of drawings]

FIG. 1 shows a first control device for a vehicle power transmission device according to the present invention.
2 is a flowchart of the first embodiment of the present invention, and FIG. 3 is a block diagram of the first embodiment of the present invention.
N range subroutine, FIG. 4 is the N range subroutine of the first embodiment of the present invention, FIGS. 5 and 6 are graphs showing the relationship between the shift lever stroke and set torque ratio of the present invention, and FIG. 7 is the N range subroutine of the first embodiment of the present invention. FIG. 8 is a graph showing the relationship between M range table rotation speed and throttle opening.
A block diagram of the embodiment, FIG. 9 is a block diagram of the second embodiment of the present invention.
This is a range subroutine.

Claims (1)

[Scope of Claims] 1) In a vehicle power transmission system equipped with a continuously variable transmission capable of continuously changing the torque ratio, by manual operation,
Torque ratio variable range setting means for arbitrarily setting a torque ratio variable range of the continuously variable transmission, and controlling the torque ratio of the continuously variable transmission according to a setting position of the torque ratio variable range setting means and vehicle running conditions. 1. A control device for a vehicle power transmission device, comprising: a torque ratio control means for controlling a torque ratio. 2) The vehicle power transmission system according to claim 1, wherein in the torque ratio variable speed range of the continuously variable transmission set by manual operation, the minimum torque ratio increases sequentially. Control device. 3) The torque ratio variable range setting means outputs a signal indicating the minimum torque ratio in any set torque ratio variable range, and the torque ratio control means outputs a signal indicating the minimum torque ratio from the torque ratio variable range setting means. a set input rotation speed calculation device that inputs the signal and the output member rotation speed of the continuously variable transmission and calculates a set rotation speed of the input member of the continuously variable transmission; A target rotation speed setting device that compares the table rotation speed and the set rotation speed, and when the set rotation speed is larger than the table rotation speed, the set rotation speed is set as the target rotation speed, and when it is smaller than the table rotation speed, the table rotation speed is set as the target rotation speed. , the target rotational speed and the input member rotational speed are compared, and when the rotational speed difference [(target rotational speed) - (input member rotational speed)] is larger than a predetermined value, the torque ratio of the continuously variable transmission is increased. A shift signal is output, and when the rotation speed difference [(target rotation speed) - (input member rotation speed)] is smaller than zero, an upshift signal is output that reduces the torque ratio of the continuously variable transmission, and the rotation speed difference is [(Target rotation speed)
- (input member rotation speed)] is greater than or equal to zero and less than a predetermined value, a shift signal generator outputs a signal to maintain the torque ratio of the continuously variable transmission at the current torque ratio, and an output signal of the shift signal generator is provided. 3. The control device for a power transmission device for a vehicle according to claim 1, further comprising a controller that controls the torque ratio between the input and output members accordingly. 4) The torque ratio variable range setting means outputs a signal indicating the minimum torque ratio in any set torque ratio variable range, and the torque ratio control means detects the current torque ratio of the continuously variable transmission. A torque ratio detection device, a table torque ratio calculation device that calculates a table torque ratio by inputting a table rotation speed preset corresponding to the throttle opening and an output member rotation speed of the continuously variable transmission; input the ratio and the minimum torque ratio, and when the ratio of the table torque ratio to the minimum torque ratio is 1 or less, the minimum torque ratio is set as the target torque ratio, and when the ratio is greater than 1, the table torque ratio is set as the target torque ratio. A target torque ratio setting device inputs the current torque ratio and the target torque ratio, and determines that the ratio of the current torque ratio to the target torque ratio is 1.
When the ratio is smaller than a predetermined value, a downshift signal is output that increases the torque ratio of the continuously variable transmission; when the ratio is 1 or more, an upshift signal is output that decreases the torque ratio of the continuously variable transmission; is greater than or equal to a predetermined value and 1
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 smaller than the current torque ratio; and a shift signal generator that controls the torque ratio between the input and output members in accordance with the output signal of the shift signal generator. A control device for a vehicle power transmission device according to claim 1 or 2, comprising a controller. 5) The continuously variable transmission is a V-belt type continuously variable transmission consisting of an input pulley, an output pulley, and a V-belt stretched between the two pulleys, and the controller adjusts the torque ratio steplessly. 5. The control device for a power transmission device for a vehicle according to claim 3, wherein the control device for a power transmission device for a vehicle is characterized in that the interval between the V-shaped grooves of the input pulley and the output pulley is controlled so as to be variable.