JPH054609Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shift control device for an automatic transmission that performs appropriate shift control when driving in traffic jams in urban areas or the like.

[Conventional technology]

Conventional automatic transmission shift control devices, for example, manually operate a pattern changeover switch to create an economy driving pattern in which the shifting point is in a relatively low vehicle speed region, and a power driving pattern in which the shifting point is in a relatively high vehicle speed region. There is one that allows you to select a pattern. When the economy driving pattern is selected, the automatic transmission shifts at relatively low vehicle speeds, allowing smooth and easy driving over a wide range of areas from city streets to expressways. Furthermore, when the power driving pattern is selected, the gears are shifted in a relatively high vehicle speed range, allowing smooth driving on mountain roads and the like that require large amounts of power and engine braking.

On the other hand, in Japanese Unexamined Patent Publication No. 59-200849, it is determined whether or not the driving is in a traffic jam based on the distribution state of instantaneous vehicle speed within a set time, and the shift pattern of the automatic transmission is adjusted according to the driver's decision. There have been proposals for automatic switching without manual operation.

[The problem that the idea aims to solve]

However, in these shift control devices, the shift point in the driving pattern differs depending on the amount of accelerator depression, so when driving in traffic congestion such as in urban areas where starting and stopping are repeated, downshifting and downshifting due to accelerator depression are difficult. Shifting up as the accelerator is released is repeated,
There was a problem that the driver felt uncomfortable.

In addition, in the former transmission control device, the selection between the economy driving pattern and the power driving pattern was performed by manual operation of a pattern changeover switch, so when to change the speed change pattern depends on the speed change pattern. This requires the driver's recognition and is troublesome as it requires manual operation.

In addition, in the latter shift control device, although the shift pattern is automatically switched depending on whether or not the vehicle is driving in traffic jams, it is necessary to perform statistical processing based on the instantaneous vehicle speed distribution state at the time of this decision. Specifically, complex calculations are performed to determine the average instantaneous vehicle speed within a set time, kurtosis α ₁ , and skewness α ₂ , so it takes time to determine whether or not the vehicle is driving in traffic jams. There were concerns that it would not be possible to select a shift pattern suitable for the ever-changing driving conditions without delay. In addition, statistical processing requires a large number of samples, which requires a large memory to store vehicle speed data sampled within a predetermined period of time, which inevitably leads to further complexity in the equipment. It was hot.

This invention prevents frequent gear changes caused by accelerator operation even when driving in traffic jams in urban areas, and makes it possible to quickly determine whether or not driving is in urban areas without complicating the device. The object of the present invention is to obtain a speed change control device for an automatic transmission.

[Means to solve the problem]

In order to solve the above problem, in the present invention, as shown in the block correspondence diagram of FIG. 1, the position of the select lever of the automatic transmission is detected in the electronically controlled automatic transmission 105 that can arbitrarily change the gear used. and a vehicle speed determining means 100 that detects the vehicle speed at predetermined time intervals and outputs a signal indicating whether the vehicle speed is greater or less than a set value.
and a timer or counter 1 which receives the signal and increases the value when the vehicle speed is lower than the set value, and decreases the value when the vehicle speed is higher than the set value.
02; shift pattern storage means 103 for storing a first shift pattern and a second shift pattern having different shift characteristics from the first shift pattern; The first or second shift pattern in the shift pattern storage means 103 is selected according to the value of the counter 102, and the automatic transmission 10
and a shift control means 104 for controlling the first shift, and the shift control means 104 determines that the vehicle is traveling in the suburbs when the value of the timer or counter 102 is less than a predetermined value, and The second shift pattern is selected, and when the value of the timer or counter 102 is greater than or equal to a predetermined value, it is determined that the vehicle is running in a city area and the second shift pattern is selected. There is.

[Effect]

The timer or counter 102 increases the value when the vehicle speed is lower than the set value, and decreases it when the vehicle speed is higher than the set value, and the shift control means 104 controls the timer or counter 102 so that the value is set to a predetermined value. If the value is less than the predetermined value, it is determined that the vehicle is driving in the suburbs and the first shift pattern is selected, and if the value of the timer or counter is greater than or equal to a predetermined value, it is determined that the vehicle is driving in the city. Then, a second shift pattern having different shift characteristics from the first shift pattern is selected, and the shift of the automatic transmission is controlled at the shift point of the selected shift pattern.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

2 to 5 are diagrams showing a first embodiment of the present invention.

1 is a microcomputer, which includes a CPU (Central Processing Unit) 2 as a speed change control means, a RAM (Random Access Memory) 3 as a shift pattern storage means, a ROM (Read Only Memory) 4,
It has an input/output control circuit 5 and a timer 11.

RAM3 stores an urban area pattern corresponding to the second shift pattern as shown in Figure 3a, and a third shift pattern.
A suburban pattern corresponding to the first shift pattern as shown in FIG. b is stored. Here, the urban pattern is set so that the shift point is in a relatively high vehicle speed range and does not change much depending on the throttle opening, and the hysteresis between the shift up point and the shift down point is large.

The ROM 4 stores an execution program shown in the flowchart described later.

6 is a vehicle speed sensor that outputs a signal indicating whether the detected vehicle speed is higher or lower than a set value at predetermined time intervals, and 7 is a throttle opening that detects the throttle opening during a period corresponding to the running load of the vehicle. A sensor 8 is a select position switch serving as select position detecting means for detecting the position of a select lever 10 of the automatic transmission 9.

Here, the value of the timer 11 is increased or decreased in accordance with a signal input from the vehicle speed sensor 6.

4 and 5 are flowcharts showing the above-mentioned execution program.

In the flowchart of FIG. 4, first, the signal from the select position switch 8, that is, the current position of the select lever 10 is read. If the selection position is other than the D range, a shift pattern for each range is selected, and if the selection position is the D range, a shift pattern is selected based on the flowchart of FIG. 5, which will be described later.

Next, the control details regarding the selection of the shift pattern in FIG. 4 will be explained with reference to the flowchart in FIG. 5.

In the routine executed every predetermined time _T0 in the figure, after detecting the traveling vehicle speed V, it is compared with the set vehicle speed _V0 , and if the traveling vehicle speed V is a low vehicle speed below the set vehicle speed _V0 , the low vehicle speed is detected. Set the use flag F to 1 and return. Note that when the traveling vehicle speed V exceeds the set vehicle speed _V0 , F=0 (initial value).

Next, in a routine that is executed every predetermined time period _T1 that is longer than _T0 , it is first determined whether the flag F is 1 or not.

When the flag F is 1, the flag F is set to an initial value of 0, and then the value of the shift pattern selection flag P is determined according to the value T of the timer 11. Here, when T>0, P=1, and when T≦0, P=0 is set, and furthermore, the value T of the timer 11 is set to a predetermined value T _SET
is set to

When the flag F is 0, the value of the timer 11 is subtracted to T=T-1, and then the flag P is determined according to the T. When T≧0, the flag P is not changed from the previous value, while when T<0, the flag P is set to 0 and the value T of the timer 11 is
is set to 0.

Regardless of the flag F, if the flag P is 1, the urban pattern is selected; if the flag P is 0, the suburban pattern is selected, and the routine returns.

Next, the operation of this embodiment will be explained.

When the traveling speed V of the vehicle becomes a low vehicle speed below the set vehicle speed _V0 , the flag P is determined according to the value T of the timer 11 as described above, but if T≦0 at the previous determination If T>0, the suburban pattern is selected, and if T>0, the urban pattern is selected. Therefore, the vehicle speed
When the vehicle shifts to low speed after traveling at a high vehicle speed exceeding V ₀ , the shift pattern will not be changed from the suburban pattern to the city pattern unless the low vehicle speed is detected for a period of 2T ₀ .

Further, when the vehicle running speed V becomes a high vehicle speed, the value T of the timer 11 is subtracted, and when T≧0, the previously selected shift pattern is maintained, while when T<0, The suburban pattern is selected. Therefore, even when the vehicle shifts to high speed driving, the shift pattern is not changed from the urban pattern to the suburban pattern until the timer 11 is decremented and T<0.

As described above, in this embodiment, when it is determined that the vehicle is driving in the city, the shift pattern of the automatic transmission is compared so that the shift point is in a relatively high vehicle speed range and the dependence on the throttle opening is Because the structure was configured to change to a smaller urban area pattern,
Even when driving in traffic jams, where forwarding and stopping are repeated, downshifts caused by pressing down on the accelerator pedal and upshifts caused by releasing the accelerator pedal are less likely to occur, allowing the vehicle to run smoothly.

In addition, the urban area pattern in this example is
Since the hysteresis between the shift up point and the shift down point is set to be large, and the setting is such that both upshifting and downshifting are difficult to occur, the above-mentioned effect is more pronounced.

Furthermore, in this embodiment, when the vehicle transitions from high vehicle speed to low vehicle speed, the shift pattern is not changed unless low vehicle speed is detected for a period of time _2T0 .
Even when moving from low speed driving to high speed driving,
Since the shift pattern is configured not to be changed until the timer T is decremented and becomes negative, the shift pattern may be changed frequently even if the vehicle running speed V fluctuates around the set vehicle speed _V0 . can be prevented.

Further, since the determination of city driving is automatically switched according to the value T of the timer, the hassle of manual operation is eliminated.

In addition, to determine whether or not the city driving condition is
Since it is performed based on the timer value T itself, there is no need for complex calculations for statistical processing.
The determination can be made quickly, and the device does not become complicated due to the statistical processing.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 8.

The main configuration of this embodiment is as shown in FIG.
In place of the timer 11, a counter 12 whose value increases or decreases in accordance with the signal from the vehicle speed sensor 6 is provided, and the control details related to the selection of the speed change pattern have been changed to those shown in the flowchart of FIG.

In FIG. 7, the routine executed every predetermined time T ₀ is the same as that in FIG. 5, that is, the first embodiment.

Next, in a routine executed every predetermined time period _T1 longer than _T0 , it is determined whether the low vehicle speed detection flag F is 1 or 0.

When the flag F is 1, a predetermined amount _C1 is added to the value C of the counter 12, but when C exceeds the upper limit _L1 , C= _L1 is set. And flag F
Return to 0.

When the flag F is 0, a predetermined amount _C2 is subtracted from the value C _{of the counter 12, but when C is less than the lower limit L0, C=L0 is} set.

Subsequently, no matter what flag F is, counter 1
2 value C is compared with a first predetermined value _S1 .

Here, if C≧S ₁ , the shift pattern selection flag P is set to 1 and the city pattern is selected.
On the other hand, if C<S ₁ , the value of counter C is
is compared with a predetermined value S ₀ , and if C≧S ₀ , the flag P
is not changed from the previous value, and if C<S ₀ , the flag P is set to 0 and the suburban pattern is selected. Then, this routine returns.

Next, the operation of this embodiment will be explained with reference to FIG.

When the traveling speed V of the vehicle is a high vehicle speed exceeding the set vehicle speed _V0 , the flag F is 0 and the counter 1
2 is subtracted by a predetermined value C ₀ every predetermined time T ₁ .

When the traveling speed V of the vehicle becomes a low vehicle speed below the set vehicle speed _V0 , the flag F becomes 1 and the counter 1
2 is added with a predetermined value C ₁ every predetermined time T ₁ . When the value C of the counter 12 becomes equal to or greater than the first predetermined value S1, the flag P becomes ₁ and the urban pattern is selected as the shift pattern of the automatic transmission.

Thereafter, even if the vehicle continues to drive at a low speed and the value C of the counter 12 falls below the first predetermined value _S1 , the flag P remains at its previous value as long as it does not fall below the second predetermined value _S0 . . In other words, the shift pattern remains the city pattern.

When the vehicle continues to travel at a low speed and the value C of the counter 12 falls below the second predetermined value S0, the flag P becomes ₀ and the shift pattern is changed from the urban pattern to the suburban pattern.

The effects of this embodiment are similar to those of the first embodiment.

[Effect of idea]

As described above, according to the present invention, when the value of the timer or counter is less than a predetermined value, the shift control means determines that the vehicle is traveling in the suburbs and sets the first shift pattern. is selected, and if the value of the timer or counter is equal to or greater than a predetermined value, it is determined that the vehicle is driving in the city, and a second shift pattern having different shift characteristics from the first shift pattern is selected. , the automatic transmission's gear shift is controlled at the shift point of the selected shift pattern, so even when driving in traffic jams where starting and stopping are repeated, the automatic transmission can shift down and accelerate when the accelerator pedal is depressed, without the need for troublesome manual operations. Shift-up due to foot release is less likely to occur, and the vehicle can run smoothly. Furthermore, since the determination as to whether or not the vehicle is in an urban driving state is made based on the value of the timer or counter itself, there is no need for complex calculations, and the determination can be made quickly. This eliminates the need for complicated equipment.

[Brief explanation of the drawing]

Fig. 1 is a diagram corresponding to the claims of the present invention, Fig. 2 is a conceptual diagram showing the configuration of the first embodiment of the invention, Fig. 3 is a diagram showing the shift pattern of the first embodiment, Figs. 6 is a conceptual diagram showing the configuration of the second embodiment of the present invention. FIG. 7 is a flow chart showing the control details of the second embodiment. The figure is a time chart showing the operation of the second embodiment. 2...CPU (shift control means), 3...RAM (shift pattern storage means), 6...vehicle speed sensor (vehicle speed determination means), 8...select position switch (select position detection means), 9...automatic shift Machine, 11
...Timer, 12...Counter.

Claims (1)

[Scope of Claim for Utility Model Registration] An electronically controlled automatic transmission that can arbitrarily change the gear used, comprising: select position detection means for detecting the position of a select lever of the automatic transmission; vehicle speed determination means for outputting a signal indicating whether the vehicle speed is greater than or less than a set value; a timer or counter that stores a first shift pattern and a second shift pattern having different shift characteristics from the first shift pattern; a shift control means that selects the first or second shift pattern in the shift pattern storage means according to the value of a timer or counter, and controls the shift of the automatic transmission at a shift point of the selected shift pattern; The shift control means determines that the vehicle is traveling in the suburbs and selects the first shift pattern when the value of the timer or counter is less than a predetermined value. A shift control device for an automatic transmission, wherein the shift control device for an automatic transmission is characterized in that the second shift pattern is selected by determining that the vehicle is traveling in an urban area when the shift pattern is equal to or greater than a predetermined value.