JPH0128263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an automatic shift control device, particularly an automatic shift control device for automobiles, etc., which performs shift judgment processing while referring to a shift pattern prepared in advance. Alternatively, the present invention relates to an automatic shift control device that is capable of downshifting and then automatically returning to shift processing based on a shift pattern.

Conventionally, automatic shift control devices for automobiles equipped with automatic transmission devices have been used to prepare shift patterns (shift diagrams) in advance, perform shift judgment processing while referring to the shift patterns, and automatically shift gears in accordance with the judgment results. Arrangements for controlling devices are known.

However, cars with this type of automatic gear shift control system shift gears regardless of the driver's intention, so if, for example, the car in front gets too close,
When engine braking is used based on the driver's will to avoid danger, the range is switched from D (drive) range to S (second) range, or from S (second) range to L (low) range. The operations had to be complicated. Further, after changing the range as described above, if it is desired to return to normal automatic gear shifting, it is necessary to switch to the D range again, which similarly makes the operation complicated.

The present invention aims to solve the above points,
Allowing the driver to change gears based on his/her will within a range that does not interfere with the driving conditions of the vehicle such as engine characteristics, allowing the driver to change gears based on the driver's will according to the actual driving conditions, and eliminating the complexity of switching operations as described above. The purpose is to reduce the Therefore, the automatic shift control device of the present invention performs a shift process while referring to a shift pattern that is prepared in advance using vehicle speed data and engine load as parameters and is composed of a shift up line and a shift down line that is biased toward the lower speed side than the shift up line. In an automatic shift control device, there is a manual shift instruction switch that instructs to shift up or down, and a manual shift permission range that extends from a predetermined value lower than the shift down line of the shift pattern to a predetermined value higher than the shift up line of the shift pattern. furthermore, when a shift-up instruction is issued from the manual shift instruction switch, the vehicle speed and engine load are within the manual shift permission range stored in the memory means, and furthermore, on the high speed side When the shift-up line is excluded from the upper limit of the shift-up line, the vehicle speed and engine load are changed to When within the manual shift permission range stored in the storage means, excluding the range from the lower limit of the low speed side to the shift down line, downshift is performed in response to the downshift instruction. , After performing the upshift or downshift,
The present invention is characterized in that it is configured to automatically return to shift processing based on a shift pattern.

According to this invention, when an instruction to shift up or down is issued from a manual shift instruction switch, the upshift or downshift is performed in accordance with the instruction under predetermined conditions, giving priority to automatic shift processing based on a shift pattern. , and then automatically returns to that shift process.

In addition, the above conditions include not only whether the vehicle speed and engine load depend on the manual shifting permission range, which extends the shift pattern by a predetermined value to the low speed side and high speed side, but also when an instruction to shift up is given. , it is determined whether the shift does not belong to the range from the upper limit on the high speed side to the shift up line (hereinafter referred to as the first region), and if it falls within the first region even if it is within the manual shifting permission range, the shift up line is determined. Works to not allow shift up. For this reason,
Conventionally, if a shift-up command is issued from a manual shift instruction switch immediately after a shift-up, the shift-up will be performed again, the transmission will be placed in a high gear, and high engine torque will be required, and as a result, the engine output will not be able to follow suit.
There has been a problem that the engine speed decreases, causing strong knocking or engine stall in the worst case, but according to the present invention, immediately after automatic upshifting, the vehicle speed and engine load are reduced to the first level.
Even if a shift-up instruction is issued from the manual shift instruction switch in the state in which the shift-up is within the range, the shift-up will not be performed, so the above-mentioned problem is solved.

On the other hand, when a downshift is instructed, even if it is within the manual shift permission range, if it falls within the range from the lower limit of the low speed side to the downshift line (hereinafter referred to as the second region), the downshift will be performed. Work not to allow. For this reason, conventionally, if a downshift command is issued from the manual shift instruction switch immediately after a downshift, the downshift will be performed again, resulting in sudden engine braking and a problem that deteriorates drivability. However, according to the present invention, immediately after automatic downshifting based on the shift pattern, the vehicle speed,
Even if a manual downshift command is issued from the manual shift command switch while the engine load is in the second range, the downshift will not be performed, so the above-mentioned problem is solved.

The present invention will be described below with reference to the drawings.

Fig. 1 shows the configuration of an embodiment of an automatic transmission control device according to the present invention, Fig. 2 shows a flowchart for explaining its processing operation, and Fig. 3 shows an example of a pattern consisting of a shift pattern and a manual pattern. .

In FIG. 1, 1 is a transmission control device including a microcomputer, 2 is a key switch, 3 is a vehicle speed sensor, 4 is a shift lever switch including at least a D range and an L range, and 5 is a shift instruction for instructing upshifting and downshifting. Switch,
6 is a throttle opening sensor which is an example of engine load detection means, 7 is an automatic transmission, and 8 is a solenoid which, in combination with another solenoid 9 and the driving state, determines, for example, the speed range of 1st to 3rd speeds. Each represents something to be decided.

In such a configuration, when the key switch 2 is turned on, the power supplied by the stabilized power supply circuit is applied to the microcomputer, and the microcomputer starts processing as shown in FIG.

First, after passing through a start step 101, an initialization step 102 is executed to reset a flag F, which will be described later.

Next, a vehicle speed calculation step 103 is executed to calculate the vehicle speed based on the vehicle speed signal from the vehicle speed sensor 3.

Next, a θ acquisition step 104 is executed to acquire the throttle opening signal from the throttle opening sensor 6.

Next, execute shift lever L determination step 105,
It is determined whether the range position of the shift lever switch 4 is the L range. If it is determined that the shift lever is in the L range, a known shift lever L processing step 106 is executed, a shift pattern prepared in advance is read out from the storage unit separately from the shift pattern, and then step 107 is executed. On the other hand,
If it is determined that it is not in the L range, the process moves directly to step 107.

In step 107, the vehicle speed calculated in the vehicle speed calculation step 103 and the vehicle speed calculated in the step 103 are calculated.
The throttle opening taken in step 104 corresponds to the manual pattern (2→
1), (1→2), (3→2), (2→3), that is, the line (2→
1) and the line (1→2), or the range surrounded by the line (3→2) and the line (2→3). To be more specific, the above vehicle speed and throttle opening are connected by line (2→1) and line (1).
→2) or the area surrounded by lines (3→2) and (2→3) is determined.

If the vehicle speed and throttle opening are within the manual shift permission range, then step 108 is executed.
It is determined whether a shift up instruction has been issued by the shift instruction switch 5. When it is determined that a shift up instruction has been given, a shift determination step 109 is executed, and a speed area obtained by shifting up one speed from the speed area immediately before the shift up instruction is determined as a new shift position, and then step 110 is executed. Flag F is set, then solenoid output step 111 is executed, and the shift judgment step described above is executed.
The solenoid drive signal corresponding to the shift position determined in step 109 is sent to solenoid 8 and solenoid 9.
Output to. However, a shift up instruction given when the vehicle speed belongs to range A surrounded by line 1 → 2 and line (1 → 2) or range B surrounded by line 2 → 3 and line (2 → 3) , and the current shift position is maintained.

On the other hand, if it is determined in step 108 that a shift-up instruction has not been issued, then step 112 is executed to determine whether a shift-down instruction has been issued by the shift instruction switch 5.

When it is determined that a downshift instruction has been issued, a shift determination step 113 is executed, and a speed area obtained by downshifting by one speed from the speed area immediately before the downshift instruction is determined as a new shift position.
Next, execute step 110 to set flag F,
Next, a solenoid output step 111 is executed, and a solenoid drive signal corresponding to the shift position determined in the shift determination step 113 is sent to the solenoid 8.
and output to solenoid 9. However, line (2→
1) and line 2 → 1, or line (3
A downshift instruction issued when the vehicle speed falls within the range D surrounded by →2) and line 3→2 is invalidated, and the current shift position is maintained.

On the other hand, if it is determined in step 112 that a downshift instruction has not been given, then step 114 is executed to determine whether flag F is set. If it is determined that flag F is not set, then shift determination step 115 is executed. In this shift judgment step 115, shift patterns prepared in advance in the storage section (lines 2→1, 1→2, 3 in the pattern diagram in FIG. 3) are selected.
→2, 2→3) is accessed using the throttle opening θ taken in step 104, and the corresponding vehicle speed data ( The output shaft rotation speed data) is read out, and the vehicle speed calculated in the vehicle speed calculation step 103, the vehicle speed data, and the vehicle speed calculated in the vehicle speed calculation step 103 in the previous program execution are read out. It is determined whether the vehicle speed value corresponding to the above read vehicle speed data is included between the vehicle speed value and the current vehicle speed value, and it is determined whether to shift up, downshift, or maintain the current shift position. . Here, the above lines 2→1, 1→2, 3→2, 2→3 are respectively from 2nd speed to 1st speed, from 1st speed to 2nd speed,
This is a shift line that determines upshifting or downshifting from 3rd speed to 2nd speed and from 2nd speed to 3rd speed.

Next, step 116 is executed to reset flag F, and then step 111 is executed to output the solenoid drive signal corresponding to the shift position determined in shift determination step 115 to solenoid 8 and solenoid 9.

On the other hand, if it is determined in step 114 that flag F is set, then solenoid output step 111 is executed, and the shift position corresponding to the shift position determined in shift determination step 109 or shift determination step 113 is executed. Still outputs the solenoid drive signal.

If it is determined in step 107 that the vehicle speed is not within the manual shift permission range, then in step 117 it is determined whether or not the flag F is set, and it is determined that the flag F has been reset. Once determined, a shift determination is made in step 115 based on the shift pattern, as described above. On the other hand, in step 117 above, the flag F
If it is determined that the manual pattern is set, a shift determination is made based on the manual pattern.

Next, the processing operation of this embodiment will be specifically explained.

When the vehicle is in a normal driving state, that is, when the D range is selected by the shift lever switch 4 and the shift instruction switch 5 is not operated, the vehicle speed and throttle opening are within the manual shift permission range. Step 103
A closed loop consisting of step 104, step 105, step 107, step 108, step 112, step 114, step 115, step 116, and step 111 is repeatedly executed, while the vehicle speed and throttle opening are within the manual shift permission range. If not, step 103, step 104 and step
A closed loop consisting of step 105, step 107, step 117, step 115, step 116, and step 111 is repeatedly executed. Therefore, a shift judgment is made based on the shift pattern 2→1, 1→2, 3→2, 2→3 in FIG. 3, and a solenoid drive signal corresponding to the determined shift position is output to solenoid 8 and solenoid 9. Then, the shift position of the automatic transmission 7 is determined.

In this normal driving state, when a shift up instruction is issued by the shift instruction switch 5, if the vehicle speed and throttle opening at the time of this instruction are within the manual shift permission range, step 109 is executed to change the current shift position. A shift position upshifted by one speed is determined, and then in step 110 flag F is set, and a solenoid drive signal corresponding to the shift position determined as described above is output to solenoid 8 and solenoid 9. however,
When the vehicle speed and throttle opening belong to range A or B, the shift up instruction is invalidated and the current shift position is maintained. Therefore, even if a shift-up command is issued from the shift instruction switch 5 immediately after a shift-up, when the vehicle speed and engine load are in range A or B, the shift-up will not be performed, and the engine output as described above will not reach the required torque. This solves the problem of a drop in engine speed due to inability to follow the same conditions, and enables smooth gear changes.

Then, when the shift up instruction is turned off, the judgment result of step 108 is reversed to "NO", the judgment result of step 112 is "NO", and step 114 is reversed.
The judgment result is ``YES'' because the flag F is set by executing step 110, and then step 111 is executed, and the solenoid output processing to maintain the shift position by the shift judgment step 109 described above is still performed. conduct.

Thereafter, when the vehicle speed and throttle opening are outside the manual shift range, the determination result at step 107 is reversed to "NO", and step 117 is then executed.

Since the flag F is in the set state, the determination result in step 117 is ``YES'', and then shift determination step 118 based on the manual pattern is executed. In this step 118, if the shift position determined by the shift determination step 109 described above is, for example, second gear, the vehicle speed and throttle opening are set to the line (2→1) shown in FIG.
When the line (2→3) is crossed to the left, it is determined to shift to first gear, and when the line (2→3) is crossed to the right, it is determined that the gear is to be shifted to third gear. If the determined shift position is the third speed, it is determined that the shift to the second speed is to be performed when the vehicle speed and the throttle opening exceed the line (3→2) shown in FIG. 3 to the left. After making a shift judgment in step 118, step 116 is then executed to reset flag F, and then solenoid output step 111 is executed to perform the shift judgment step described above.
A solenoid drive signal corresponding to the shift position determined in step 118 is output. Therefore, the automatic transmission 7 is shifted to the above shift position.

Then, the next time the program is executed, since the vehicle speed and throttle opening have just gone out of the manual shift range, the determination result at step 107 is "NO", and step 117 is then executed.
The result of this determination is "NO" since the flag F is in the reset state as a result of the execution of step 116, and therefore, a normal shift determination based on the shift pattern is executed in step 115. Thereafter, this shift determination step 115 is constantly executed until a shift up or down shift instruction is given, and the automatic transmission 7 is shifted in accordance with the shift position determined in step 115.

Note that if the vehicle speed and throttle opening do not belong to the manual shift permission range at the time when the above-mentioned shift up instruction is given, the step
Since the determination result in step 107 is "NO", the route on the step 108 side is not selected, and therefore the shift-up determination as described above is not made in step 109, and as a result, the shift-up instruction is not accepted. Here, the area outside the manual shift permission range includes the left side of the line (2 → 1) shown in Figure 3, the line (1 → 2) and the line (3 → 2).
and the right side of the line (2→3).

On the other hand, in normal driving conditions, when a downshift instruction is issued by the shift instruction switch 5, if the vehicle speed and throttle opening at the time of this instruction are within the manual shift permission range, step 113 is executed to change the current shift. A shift position is determined by downshifting the position by one speed, and then in step 110 flag F is set, and a solenoid drive signal corresponding to the shift position determined as above is output to solenoid 8 and solenoid 9. . However, when the vehicle speed falls within range C or D shown in FIG. 3, the downshift instruction is invalidated and the current shift position is maintained. Therefore, even if a downshift instruction is issued from the shift instruction switch 5 immediately after a downshift, when the vehicle speed and engine load are in ranges C or D, the downshift will not be performed, and the above-mentioned sudden engine braking will not occur. This can be prevented and drivability will not be impaired.

When the downshift instruction is turned off, the determination result in step 112 is reversed to "NO", and the determination result in step 114 is "YES" because flag F is set due to the execution of step 110.
Next, step 111 is executed, and solenoid output processing is still performed to maintain the shift position according to shift determination step 113 described above.

Thereafter, when the vehicle speed and throttle opening are outside the manual shift range, the determination result at step 107 is reversed to "NO", and step 117 is then executed.

Since the flag F is in the set state, the determination result in step 117 is ``YES'', and then shift determination step 118 based on the manual pattern is executed. In this step 118, if the shift position determined by the shift determination step 113 described above is, for example, first gear, the vehicle speed and throttle opening are set to the line (1→2) shown in FIG.
When the vehicle crosses to the right, it is determined to shift to 2nd gear.

In addition, when the above determined shift position is 2nd gear, when the vehicle speed and throttle opening cross the line (2 → 1) to the left, the shift position is changed to 1st gear, and the line (2 → 3) is shifted to the right. If the speed exceeds , it is determined that the gears should be shifted to third gear. After making the shift judgment in step 118, step 116 is then executed to reset the flag F, and then solenoid output step 111 is executed to shift the shift position judged in the shift judgment step 118. Outputs the corresponding solenoid drive signal. Therefore, the automatic transmission is shifted to the above shift position.

Then, the next time the program is executed, since the vehicle speed and throttle opening have just gone out of the manual shift range, the determination result at step 107 is "NO", and step 117 is then executed.
The result of this determination is "NO" since the flag F is in the reset state as a result of the execution of step 116, and therefore, a normal shift determination based on the shift pattern is executed in step 115. Thereafter, this shift determination step 115 is constantly executed until a shift up or down shift instruction is given, and the automatic transmission 7 is shifted in accordance with the shift position determined in step 115.

Furthermore, if the vehicle speed and throttle opening do not belong to the manual shift permission range at the time when the above-mentioned downshift instruction is issued, the vehicle speed and throttle opening are changed when the above-mentioned shift up instruction is issued. The same process as when the manual shift does not belong to the manual shift permission range is executed, and as a result, the downshift instruction is not accepted.

As explained above, according to the automatic gear shift control device according to the present invention, it is possible to accept gear shifts based on the driver's intention as much as possible, and furthermore, it is possible to automatically return to processing in the normal driving state after that, so that the driver's It is possible to realize the intended driving, and the operation for that purpose can be performed extremely easily. In addition, even if a shift up or down shift is instructed from the manual shift instruction switch immediately after an automatic shift up or down shift, the gear shift will not be performed. It is possible to perform smooth gear changes without any reduction in speed. Further, when a downshift is instructed, sudden engine braking can be prevented from occurring, and drivability is not impaired.

Note that what detects the engine load is not limited to only the throttle sensor, but may also be a negative pressure sensor that detects the intake negative pressure of the engine.

[Brief explanation of drawings]

FIG. 1 shows the configuration of an embodiment of an automatic transmission control device according to the present invention, FIG. 2 is a flowchart for explaining its processing operation, and FIG. 3 is a pattern diagram consisting of a shift pattern and a manual pattern. 1... Speed change control device, 3... Vehicle speed sensor, 5...
...Shift instruction switch, 7...Automatic transmission, 2→
1, 1 → 2, 3 → 2, 2 → 3...Shift pattern, (2 → 1), (1 → 2), (3 → 2), (2 → 3)
...Manual pattern.

Claims (1)

[Scope of Claims] 1. Automatic shift control that performs shift processing while referring to a shift pattern that is prepared in advance using vehicle speed data and engine load as parameters and is composed of a shift up line and a shift down line that is biased toward lower speeds than the shift up line. The device includes a manual shift instruction switch that instructs upshifting or downshifting, and a range from a predetermined value lower than the shift-down line of the shift pattern to a predetermined value higher than the shift-up line of the shift pattern is stored in advance as a manual shift permission range. furthermore, when an instruction to shift up is issued from the manual shift instruction switch, the vehicle speed and engine load are within the manual shift permission range stored in the memory means and from the upper limit on the high speed side. When the vehicle falls within the range excluding the range up to the shift-up line, the vehicle speed and engine load are shifted up in response to the shift-up instruction, and when a shift-down instruction is issued from the manual shift instruction switch, the vehicle speed and engine load are stored in the storage means. is within the manual shift permission range stored in the manual shift range, excluding the range from the lower limit of the low speed side to the above shift down line, downshifts are performed in response to the above shift down instruction, and the upshift is performed. Or after performing a downshift,
An automatic shift control device characterized in that it is configured to automatically return to shift processing based on a shift pattern.