JPS61115735A - 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 making a stepless shift selectable to manual transmission according to the setting position of an input engine speed variable range setting device. CONSTITUTION:A stepless shift 2 makes a torque ratio shiftable in succession. A shift lever 6 is of a selecting device changing from a D range of automatic gear shifting to an M range of manual gear shifting and vice versa by means of manual operation. An input engine speed variable range setting device 3 outputs a signal corresponding to the setting position at the M range of the shift lever 6. A torque ratio controlling device 4 controls the torque ratio of the stepless shift 2 according to the setting position of the input engine speed variable range setting device 3. A torque ratio automatic setting device 5 automatically controls the torque ratio of the stepless shift 2 according to car driving conditions at the D range of the shift lever 6.

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 vehicle power transmission device equipped with a continuously variable transmission device automatically changes the torque ratio depending on vehicle running conditions.
It has a drive (D) range, which is a so-called automatic shift range, and a low (L) range, which is for engine braking. The torque ratio of the continuously variable transmission is automatically controlled to achieve the best fuel consumption speed, and the torque ratio of the continuously variable transmission is forcibly downshifted to provide engine braking in the L range. I'm letting you do it.

[Problems to be solved by the invention] However, in the vehicle power transmission device having the above configuration, D
In the case of a range, the gears automatically shift according to a predetermined pattern depending on the vehicle driving conditions, so the driver's intentions are not always fully reflected, and depending on the driver, the feeling provided may not be the best. . For example, when a vehicle is driving on a mountain road, gears are changed frequently as the accelerator pedal is turned on and off, reducing drivability.Furthermore, when accelerating for overtaking, the gear may upshift against the driver's will. Therefore, sufficient acceleration cannot be obtained. Further, only one or two predetermined engine brake patterns, which may be in the L range, can be selected, making it impossible to obtain engine braking appropriate for all driving conditions.

The present invention provides a range in which automatic shifting is possible using a switching means such as a shift lever, and an M range in which manual shifting is possible, and in the D range, the continuously variable transmission is automatically shifted according to vehicle driving conditions, In the M range, a predetermined position can be arbitrarily selected by the driver's operation, and at that position, the input rotation speed variable range setting means (for example, the input rotation speed variable range setting means for setting the input rotation speed variable range of the continuously variable transmission) Provided is a control device for a power transmission device for a vehicle, which is provided with a shift lever whose position can be arbitrarily selected, and which allows a continuously variable transmission to be manually shifted according to the set position of the input rotation speed variable range setting means. The purpose is to

[Means for Solving the Problems] The 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 the torque ratio. The first position and the second
a switching means for switching between a first position and a first position of the switching means; and when a first position of the switching means is selected, the torque ratio of the continuously variable transmission is automatically controlled from a maximum torque ratio to a minimum torque ratio of 1 to a torque ratio according to vehicle running conditions. an input rotation speed variable range setting means for arbitrarily setting the input rotation speed variable range of the continuously variable transmission by manual operation when the second position of the switching means is selected; and torque ratio control means for controlling the torque ratio of the continuously variable transmission according to vehicle running conditions within the input rotation speed variable range set by the input rotation speed variable range setting means.

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

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

口) Since the minimum input rotation speed can be set continuously, it is possible to drive as the driver intends in any driving condition. For example, when driving downhill, the minimum input rotation speed can be selected depending on the slope of the downhill slope, so that the engine braking effect desired by the driver can be obtained.

Similarly, an appropriate minimum input rotation speed can be selected when pitching or accelerating.

C) When starting, the vehicle can start with the maximum torque ratio regardless of human operation.

2) During engine braking The driver can apply smooth engine braking according to the vehicle speed simply by setting the minimum input rotation speed, and the torque ratio increases as the vehicle speed decreases.

e) When driving on mountain roads, etc., the minimum value of the input rotation speed can be manually set, so the torque ratio is selected according to the vehicle driving conditions such as vehicle speed, and the torque ratio can be adjusted according to changes in the vehicle driving conditions such as throttle opening. It has a good feel because the speed is controlled.

f) By sequentially changing the setting of the minimum value of the input rotation speed by human tlj operation, the torque ratio to the vehicle speed can be limited, so manual driving is possible, and at the same time, automatic shifting is also possible within the input rotation speed variable range set. It can be carried out.

G> Automatic gear shifting can be performed by selecting the automatic torque ratio setting means.

h) The speed change pattern of the input speed variable range setting means and the torque ratio automatic setting means can be switched and set. For example, the input speed variable range setting means can be set to the maximum dynamic cover turn, and the speed change pattern of the torque ratio automatic setting means can be set. You can set the best fuel efficiency pattern.

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

In this actual example, the control device @ 1 of the vehicle power transmission device of the present invention includes a continuously variable transmission @ 2 that can continuously change the torque ratio, and a control device @ 2 that can be manually changed to the first position (automatic transmission). The shift lever 6, which is a switching means for switching between the D range and the second position (M range for manual shifting), and the M shift lever &
Input rotation speed variable range setting means 3 outputs a signal (minimum input rotation speed signal in this embodiment) according to the set position in the range, and continuously variable speed according to the setting position of input rotation speed variable range setting means 3 It consists of a torque ratio control means 4 that controls the torque ratio of the device 2, and an automatic torque ratio setting means 5 that automatically controls the torque ratio of the continuously variable transmission in accordance with vehicle running conditions in the D range of the shift lever 6.

In this embodiment, the continuously variable transmission 12 has a V-belt type continuously variable transmission 21, and the V-belt type continuously variable transmission 21 has an input shaft 2.
2. An output shaft 23 parallel to the input shaft 22, a fixed 7 lange 24a provided on the input shaft 22 and integrally molded with the input shaft 22, and a movable shaft that slides on the input shaft 22 in the axial direction. V-belt type continuously variable transmission 1f with flange 24b
A V-belt type having an input coupler 24 which is an input member of the i21, a fixed 7 lange 25a which is provided on the output shaft 23 and integrally formed with the output shaft 23, and a movable flange 25b which slides on the output shaft 23 in the axial direction. It consists of an output pulley 25, which is an output member of the continuously variable transmission 21, and a belt 26 stretched between the input pulley 24 and the output pulley 25. The interval between the V-shaped grooves 24A and 25A of the pulley 25 is controlled.

A shift lever 6, which is a switching means, has a parking (P) range, a reverse (R) range, a neutral (N) range, a drive (D) range, and a manual (M) range. Shift lever 6 manual (M
) The set position can be slid back and forth from HIGH to LOW, and an input rotation speed variable range setting means 3 is provided that outputs a signal corresponding to the set position. This input rotation speed variable range setting means 3 transmits the movement of the shift lever 6 to the potentiometer 31.
The minimum input rotation speed detection device 32 detects the minimum input rotation speed in the input rotation speed variable range based on the potential difference between the two.

6 and 7 are diagrams showing the relationship between the shift lever stroke and the set minimum input rotation speed, and FIG. 6 shows the case where the set minimum input rotation speed is set steplessly with respect to the shift lever stroke. 7 shows a case where the set minimum input rotation speed is set in multiple stages with respect to the shift lever stroke. The torque ratio control means 4 uses the minimum rotation speed (Nmin) signal from the minimum rotation speed detection device 32 The table rotates in response to the engine speed (NE') signal from the engine speed sensor 41A, the throttle opening (θTH) signal from the throttle opening sensor 41B, and the coolant temperature (Tw> signal from the coolant temperature sensor 41C). The target rotation speed setting device 43 inputs the table rotation speed (Nt) signal from the table rotation speed setting device 42 which sets the number (Nt > signal, and compares each signal to set the target rotation speed. The input pulley rotation speed (Ni >) from the input pulley rotation speed sensor 44A is compared with the input pulley rotation speed (Ni > It outputs a downshift signal that increases the torque ratio of the step-change transmission 21, and when the rotation speed difference is smaller than zero, it outputs an upshift signal that decreases the torque ratio of the V-belt continuously variable transmission 21, and increases the rotation speed. A shift signal generator 45A that outputs a signal to maintain the torque ratio of the V-belt continuously variable transmission 21 at the current torque ratio when the difference is greater than zero and less than a predetermined value; and the shift signal generator 45A.
The input pulley 24 and the output pulley 2
The pulley controller 46 controls the interval between the V-shaped grooves 24A and 125A.

The automatic torque ratio setting means 5 is activated by the driver selectively switching the shift lever 6 to the (D) range, and receives the engine speed (NE) signal from the engine speed sensor 41A;
The throttle opening (e) from the throttle opening sensor 41B
TH) signal, the cooling water temperature from the cooling water temperature sensor 41C (T
w) Signal, input pulley rotation speed (Ni) signal from input pulley rotation speed sensor 44A, output pulley rotation speed sensor 44
Input the output pulley rotation speed (Nb > signal from 3,
It has an automatic torque ratio setting control device 51 that outputs an output signal to the pulley controller 46 to automatically control the torque ratio of the V-belt continuously variable transmission 21 within a variable range of input rotation speed set by the driver. .

FIG. 2 shows the first control device of the vehicle power transmission device of the present invention.
゛Showing the operation flowchart of the embodiment, operate the engine with the starter key ONL (101), perform initial value setting (102), and input the shift position signal of the shift lever 6.103), from the throttle opening sensor 41B. Please enter the throttle opening (eTH) 10
4) Input the pulley rotation speed (Ni) from the input pulley rotation speed sensor 44A. 105) Input the minimum rotation speed (Nmin) from the input rotation speed variable range setting means 3. 1oe) Shift position of the shift lever. 107) When in the P range, perform the P range control subroutine (
108), and then returns to (103). When in R range, execute R range control subroutine (109)
), then returns to (103), performs the N range control subroutine when in the N range (110), then returns to (103), performs the D range control subroutine when in the D range (111), and then (10)
Returns to step 3), executes the M range control subroutine when in M range (112), and then returns to step (103).

FIG. 3 shows the first control device of the vehicle power transmission device of the present invention.
The embodiment shows an N range subroutine.

From the D range table best fuel efficiency data (Fig. 11), extract the target rotation speed (best fuel efficiency data) of the input coupler 24 corresponding to the throttle opening (eTH).121)
Next, (target rotation speed) - (input pulley rotation speed) = 8 is H
<Determine whether A, O≦A≦H, or A<O. 122>
When H (hysteresis) < A, the pulley controller 46
123) to downshift the V-belt continuously variable transmission. When O≦A≦H,
Output a signal to the pulley controller 4G to maintain the current torque ratio 124) to maintain the V-belt type continuously variable transmission at the current torque ratio. When Ago, pulley controller 4
125) to upshift the V-belt continuously variable transmission. 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 shifting. The scope is determined.

Figure 11 is a diagram showing the relationship between the table rotation speed and the throttle opening in the D range.This table rotation speed is determined to obtain the best fuel efficiency or the maximum power. be.

FIG. 4 shows the first control device of the vehicle power transmission device of the present invention.
The P and R range subroutines of the embodiment are shown.

The P, R range subroutine outputs a signal to maintain the maximum torque ratio (131) and maintains the V-belt continuously variable transmission at the maximum torque ratio.

FIG. 5 shows the first control device of the vehicle power transmission device of the present invention.
The M range subroutine of the embodiment is shown.

From the M range table (Fig. 12), the throttle opening (e
Pull out the input booley rotation speed corresponding to TH) 14
1), (minimum set rotation speed) - (table rotation speed) - B should be determined when B<O is 8≧0.142), When 3<Q, set the table rotation speed (Nt') as the target rotation speed. 143
), then (target rotation speed) - (input pulley rotation speed > -
144) When H<C, a downshift signal should be output to the pulley controller 46. 145) V-belt type continuously variable transmission Downshift aircraft 21. When C is O, an upshift signal is output to the pulley controller 46 (146), and the V-belt continuously variable transmission 21 is upshifted.

When O≦C≦H, a signal is output to the pulley controller 46 to maintain the current torque ratio U>147), and the V-belt continuously variable transmission 21 is maintained at the current torque ratio. (14
When B≧0 in 2), the set minimum rotational speed is set as the target rotational speed (147), and the process then proceeds to (144). 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 shifting. The scope is determined.

Figures 8, 9, and 10 show a second embodiment of the control device for a vehicle power transmission device according to the present invention.

(The same functional objects as in the first embodiment are indicated by the same numbers.) In this embodiment, the input rotation speed variable range setting means 3 is a minimum rotation speed detection device that detects the minimum rotation speed (Nmin) by the potential difference of the potentiometer 31. 32, inputs the minimum rotation speed (Nmin) signal from the minimum rotation speed detection device 32 and the output pulley rotation speed (NO) signal from the output pulley rotation speed sensor 4413, calculates the set torque ratio, and A table determined corresponding to the engine speed (NE) signal from the rotation speed sensor 41A, the throttle opening (eTH) signal from the throttle opening sensor 413, and the coolant temperature (Tw) signal from the coolant temperature sensor 41Q. The table torque ratio (it) signal from the table torque ratio setting device 47, which calculates the table torque ratio (it) by inputting the rotation speed (Nt) and the output pulley rotation speed (NO), and the set torque ratio are input. When the ratio of the table torque ratio to the set torque ratio is less than 1, the set 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.
8 and ■ Input pulley rotation speed of belt bottom continuously variable transmission 21 (
The current torque ratio (i) from the current torque ratio sensor 49 that detects the current torque ratio (1) from the output pulley rotation 1 (No) and the current torque ratio (i) are input, and the target torque of the current torque ratio is input. When the ratio to 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 the ratio is 1.
When the ratio is greater than a predetermined value, an upshift signal is output that reduces the torque ratio of the V-belt continuously variable transmission 21, and when the ratio is greater than a predetermined value and less than 1, the V-belt continuously variable transmission 2
The shift signal generator 45B includes a shift signal generator 45B that outputs a signal for maintaining the torque ratio of 1 to the current torque ratio (i), and the pulley controller 46.

FIG. 9 shows the second control device of the vehicle power transmission device of the present invention.
1 shows a flowchart of an example.

Turn the starter key ONL to start the engine (301
), set the initial value 302), shift lever 6
303), input the throttle opening (eTH) from the throttle opening sensor 41B, 304), input the input pulley rotation speed (Ni>) from the input coupler rotation speed sensor 44A. 305), input the output pulley rotation speed (No.) from the output pulley rotation speed sensor 443. 306)
, the input rotation speed variable range setting means 3 sets the minimum rotation speed (Nm
307), please enter the shift position of shift lever 6 (P, R, N, D, or M). 30
8) When in P range, execute P range control subroutine (309) and then return 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 (3
11), then returns to (302) and when in D range,
Executes the D range control subroutine (312)
, then returns to (302), performs the M range control subroutine when in M range (313), and then returns to (302).
303).

FIG. 10 shows an M range subroutine of a second embodiment of the control device for a vehicle power transmission device of the present invention.

Calculate the current torque ratio (i) from the input pulley rotation speed (Ni) from the input pulley rotation speed sensor 44A and the output pulley rotation speed (NO) from the output pulley rotation speed sensor 4413.311), set minimum rotation speed and output Calculate the set torque ratio from the pulley rotation speed (NO). 312)
Read the table rotation speed (Nt) corresponding to the throttle opening (θTH) from the M range table rotation speed (Figure 12) and calculate the table 1-luke ratio (i) from the table rotation speed and output pulley rotation speed. 313), Determine whether (table torque ratio)/(set torque ratio) - D is D>1 or D≦1.314), When D≦1, set the set torque ratio as the target torque ratio.315), Next Determine whether (current torque ratio)/(target torque ratio) = E is × (coefficient for hysteresis)>E, E≧1, or ×≦E≦1. 316
), when X>E, a downshift signal is output to the pulley controller 46. 317) The V-belt continuously variable transmission 21 is downshifted. When X≦E<1, a signal is output to the pulley controller 46 to maintain the current torque ratio <r> (318), and the V-belt continuously variable transmission 21 is maintained at the current 1-luke ratio. When E≧1, output an upshift signal to the pulley controller 46. 319)
', V-belt bottom continuously variable transmission t1121 is upshifted. In (314), when D>1, set the table torque ratio to the target torque ratio (320), then (316)
). Here, X means a coefficient for hysteresis, which determines the range within which the current torque ratio is maintained without changing gears in order to prevent the feeling from becoming worse due to frequent repetition of upshifts and downshifts. ing.

Figure 12 is a diagram showing the relationship between the table rotation speed and the throttle opening in the M range.This table rotation speed is determined to obtain the best fuel efficiency or the maximum power. be.

[Brief explanation of the drawing]

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 a 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 P and R range subroutines of the first embodiment of the control device for a vehicle power transmission device of the present invention, and FIG. 5 shows the P and R range subroutines of the control device for a vehicle power transmission device of the present invention M range subroutine of 1st embodiment, 6th
The figure is a graph showing the relationship between the stepless shift lever stroke and the variable set rotational speed range of the first embodiment of the control device for the vehicle power transmission device of the present invention. A graph showing the relationship between the multi-stage shift lever stroke and the set rotational speed variable range of the first embodiment of the control device, FIG. 8 is a block diagram of the second embodiment of the control device of the vehicle power transmission device of the present invention, FIG. 9 is a flowchart of the second embodiment of the control device for a vehicle power transmission device of the present invention;
0 is a graph showing the M range subroutine of the second embodiment of the control device for a vehicle power transmission device of the present invention, and FIG. 11 is a graph showing the D range table rotation speed of the control device for a vehicle power transmission device of the present invention. FIG. 12 is a graph showing the M range table rotation speed of the control tII device of the vehicle power transmission device of the present invention.

Claims (1)

[Claims] 1) In a vehicle power transmission system equipped with a continuously variable transmission capable of continuously changing the torque ratio, a switching means for switching between a first position and a second position by manual operation. and torque ratio automatic setting means for automatically controlling the torque ratio of the continuously variable transmission from a maximum torque ratio to a minimum torque ratio according to vehicle running conditions when the first position of the switching means is selected. , an input rotation speed variable range setting means for arbitrarily setting the input rotation speed variable range of the continuously variable transmission by manual operation when the second position of the switching means is selected; and the input rotation speed variable range setting means. 1. A control device for a power transmission device for a vehicle, comprising: a torque ratio control means for controlling a torque ratio of a continuously variable transmission according to vehicle running conditions within a set input rotation speed variable range. 2) The control device for a power transmission device for a vehicle according to claim 1, wherein automatic shift patterns are different between the first position and the second position of the switching means. 3) The automatic shift pattern in the first position of the switching means is a best fuel efficiency shift pattern, and the automatic shift pattern in the second position is a maximum power shift pattern. Control device for vehicle power transmission device. 4) The vehicle power transmission 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. Device control device. 5) The input rotation speed variable range setting means outputs a set minimum rotation speed signal of the input rotation speed variable range in an arbitrary 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 A downshift signal that increases the torque ratio of the continuously variable transmission is output, and the rotation speed difference between the input member rotation speed signal and the target rotation speed signal [(target rotation speed) - (
When the 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 between the input member rotation speed signal and the target rotation speed signal [(target rotation speed) - (input member rotation speed)] is greater than zero and less than a predetermined value, a shift signal generator outputs a maintenance signal to maintain the torque ratio of the continuously variable transmission at the current torque ratio; and an output of the shift signal generator. 2. The control device for a vehicle power transmission device according to claim 1, further comprising a controller that controls a torque ratio between an input member and an output member of the continuously variable transmission according to a signal. 6) 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 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 an automatic transmission for a vehicle according to claim 1. 7) 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 6, 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. .