JP3633128B2 - Shift control device for automatic transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift control device for an automatic transmission, and in particular, controls a time through a low speed stage through a low speed stage in which a neutral or one-way clutch acts during a power-on downshift as a value corresponding to a vehicle speed and an engine speed. The present invention relates to a shift control device for an automatic transmission capable of reducing shift shock by more appropriately controlling synchronization of engine speeds in various shifts.
[0002]
[Prior art]
The vehicle is provided with an automatic transmission or a manual transmission in order to convert the driving force of the mounted internal combustion engine as required according to the running conditions.
[0003]
In an automatic transmission (automatic transmission, AT), usually, a shift map including vehicle speed, throttle opening, and the like is set, and shift control is performed using this shift map.
[0004]
A shift control device for the automatic transmission is disclosed in JP-A-5-272629. A shift control device for an automatic transmission disclosed in this publication is a shift control device for an automatic transmission that includes a transmission mechanism. A shift switch that detects a shift position, a vehicle speed sensor that detects a vehicle speed, an engine And a control circuit for transmitting a shift instruction signal based on the shift switch signal from the shift switch, the vehicle speed signal from the vehicle speed sensor, or the throttle opening signal from the throttle sensor. When shifting to the side, the operation timing of the transmission mechanism is controlled by the vehicle speed signal from the vehicle speed sensor and the throttle opening signal from the throttle sensor to reduce the shift shock.
[0005]
[Problems to be solved by the invention]
By the way, in a conventional shift control device for an automatic transmission, at the time of downshifting, a neutral state is set, the engine speed is increased and synchronized, and then the clutch and brake of the gear stage to be shifted are engaged. . At this time, the neutral state time is controlled as a value corresponding to the vehicle speed.
[0006]
There is also a method using a low speed stage in which a one-way clutch acts instead of the neutral state described above.
[0007]
Further, as described in Japanese Patent Application Laid-Open No. 5-272629 described above, there is an apparatus that controls the time for which the neutral state (or the low speed stage at which the one-way clutch operates) as a value corresponding to the vehicle speed and the throttle opening.
[0008]
In other words, the time that elapses in the neutral state (or the low speed stage at which the one-way clutch acts) is a value corresponding to the difference in engine speed before and after the shift and the increase speed of the engine speed. As the vehicle speed is used.
[0009]
At this time, in the case of kickdown, since the accelerator pedal is depressed after shifting, the engine speed corresponds approximately to the vehicle speed. However, before shifting, the accelerator pedal is depressed or the accelerator pedal is depressed completely. In some cases, the engine speed takes various values within a certain range even at the same vehicle speed.
[0010]
As a result, when the vehicle speed is used as a substitute for the difference in engine speed before and after the shift, even if the shift shock can be reduced in a certain driving state, the shift shock cannot be reduced in all the driving states. There is a disadvantage that it is disadvantageous in practice.
[0011]
[Means for Solving the Problems]
Accordingly, in order to eliminate the above-described disadvantages, the present invention provides a shift control device for an automatic transmission having control means for controlling a low-speed stage transit time through a low-speed stage in which a neutral or one-way clutch acts during a power-on downshift. In this embodiment, a vehicle speed sensor for detecting the vehicle speed and an engine speed detecting means for detecting the engine speed are provided, and detection signals from the vehicle speed sensor and the engine speed detecting means are input, and the speed change from when the throttle is fully closed is provided. A vehicle speed table that sometimes has a maximum time value is set, and according to the difference between the actual engine speed detected by the engine speed detection means from the maximum time value of the vehicle speed table and the engine speed when the throttle is fully closed A function for subtracting the value and controlling to calculate the time through the low speed stage is added to the control means. And butterflies.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
By inventing as described above, at the time of power-on downshift, the time through the low speed stage through which the neutral or one-way clutch acts is set to the maximum time of the vehicle speed table that becomes the maximum time value at the time of shifting from when the throttle is fully closed. A value corresponding to the difference between the actual engine speed detected by the engine speed detection means and the engine speed when the throttle is fully closed is subtracted from the value, and control is performed to calculate the low-speed stage passing time. In shifting, the synchronization of engine speed is controlled more appropriately to reduce shift shock and control data is reduced.
[0013]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0014]
1 to 10 show an embodiment of the present invention. In FIG. 2, reference numeral 2 denotes an automatic transmission connected to an internal combustion engine (not shown) mounted on a vehicle (not shown).
[0015]
The automatic transmission 2 includes an input shaft 4 connected to an output shaft (not shown) of an internal combustion engine, a fluid torque converter 6, and a drive wheel of a vehicle on an output shaft 10 according to some speed change characteristics from the torque converter 6. And a gear transmission mechanism 12 that outputs a driving force for driving the motor.
[0016]
The gear transmission mechanism 12 includes a transmission that achieves, for example, three forward speeds and one reverse speed.
[0017]
The one-way clutch (not shown), the clutch (not shown), and the brake (not shown) of the gear transmission mechanism 12 of the automatic transmission 2 have a configuration in which hydraulic pressure is selectively supplied or discharged by an automatic transmission hydraulic control means (not shown). Therefore, switching setting is performed between three forward speeds and one reverse speed.
[0018]
The automatic transmission hydraulic pressure control means is controlled by first and second shift solenoids 14 and 16 for the gear transmission mechanism 12.
[0019]
Then, a control means 18 for communicating with the first and second shift solenoids 14 and 16 is provided, and the control means 18 controls the first and second shift solenoids 14 and 16 according to a predetermined condition.
[0020]
Further, as shown in FIGS. 3 and 4, the control means (ECU) 18 includes a throttle sensor 20, a vehicle speed sensor 22 for detecting the vehicle speed, an engine speed detecting means 24 for detecting the engine speed, and a shift. A switch 26 is connected.
[0021]
Further, as shown in FIG. 3, the control means 18 includes a shift speed calculation means 28 that communicates with the shift switch 26, the throttle sensor 20, and the vehicle speed sensor 22, and a shift detection means 30 that communicates with the shift speed calculation means 28. A power-on detection means 32 communicated with the throttle sensor 20, a shift timing control means 34 communicated with the shift detection means 30, the vehicle speed sensor 22, the engine speed detection means 24, and the power-on detection means 32; The hour timing control means 34 and the shift speed calculation means 28 are in communication with each other, and the shift solenoid control means 36 is in communication with the first and second shift solenoids 14 and 16.
[0022]
The control means 18 controls a first speed set time T, which is a low speed stage time through which the neutral or one-way clutch acts during a power-on downshift, for example, a low speed stage passing through the first speed.
[0023]
The control means 18 has a function of inputting the detection signals of the vehicle speed sensor 22 and the engine speed detection means 24 and setting the first speed setting time T, which is the low-speed passage time, based on the vehicle speed and the engine speed. It is set as the structure provided additionally.
[0024]
More specifically, the control means 18 sets a vehicle speed table that is a time maximum value at the time of shifting from when the throttle is fully closed, and according to the difference between the time maximum value of this vehicle speed table and the engine speed when the throttle is fully closed. The first speed setting time T, which is the low-speed stage passing time, is calculated by subtracting the calculated value.
[0025]
The first speed setting time T can be set as a map of the vehicle speed and the engine speed. Here, a method for reducing the number of data will be described.
[0026]
That is, the engine speed NeIDL when the throttle is fully closed is searched from the vehicle speed table of FIG. 8, and the engine speed NeIDL when the throttle is fully closed is subtracted from the actual engine speed Ne to obtain the engine speed difference ΔNe. The engine speed difference correction time _TΔNe is searched from the _TΔNe table of FIG. 9, and the first speed set time maximum value T _MAX is searched from the vehicle speed table of FIG.
[0027]
This first speed set time maximum value T _MAX is the elapsed time of the low speed stage in which the neutral or one-way clutch acts in the case of downshift due to depression of the accelerator pedal from the throttle fully closed state. Accordingly, when the engine speed at the time of shifting determination is equal when the throttle is fully closed, the value to be subtracted is zero (0).
[0028]
Further, the control means 18 sets a time minimum value in the vehicle speed table, and controls to limit the lower limit value of the first speed setting time T which is the low speed stage passing time.
[0029]
That is, searches the first speed setting Time Min _{T MIN} from the vehicle speed table in FIG. 10, when the first speed setting time T is less than the minimum value _{T MIN} 1 speed setting time, the first speed setting Time Min _{T MIN} 1 Used as the speed setting time T.
[0030]
Further calculates a first speed setting time the maximum value T _MAX of the engine rotational speed difference correction time T △ _Ne first speed setting time serving time via the low speed stage by subtracting T.
[0031]
Next, the operation will be described along the flowchart for main control of the shift control device of the automatic transmission of FIG.
[0032]
When the main control program of the shift control device of the automatic transmission starts (100), the signal from the shift switch 26 is captured (102) and the detection signal from the vehicle speed sensor 22 is captured (104). A detection signal is captured (106), and a detection signal from the engine speed detection means 24 is captured (108).
[0033]
Then, the shift stage is calculated (110) from the shift switch 26, the throttle sensor 20 and the vehicle speed sensor 22 according to the shift diagram (shift map) of the shift stage calculation means 28, and the shift from the third speed to the second speed is performed. That is, it is determined whether or not it is a downshift (112). If this determination (112) is YES, the process proceeds to determination (114) whether or not the power is on, and the determination (112) is If NO, the process proceeds to solenoid output setting (122) described later.
[0034]
If the determination whether the power is on (114) is YES, the first speed set time T is calculated (116), and then the first speed set time T is determined. The process proceeds to (118), and if the determination (114) as to whether or not the power is on is NO, the process proceeds to the solenoid output setting (122).
[0035]
If the determination (118) as to whether or not the first speed setting time T has elapsed is NO, the first speed setting (120) is performed, the solenoid output setting (122) is performed, and the shift switch (SW) 26 described above is set. If the determination (118) of whether or not the first-speed setting time T has elapsed is YES (YES), after the solenoid output setting (122) is performed, the shift switch described above is returned. The process returns to the process (102) for taking in the signal from H.26.
[0036]
Here, a description will be given along the flowchart for calculating the first speed setting time of the shift control device of the automatic transmission of FIG.
[0037]
When the first speed set time calculation program starts (200), the engine speed NeIDL when the throttle is fully closed is searched from the vehicle speed table of FIG. 8 (202), and the engine speed when the throttle is fully closed is determined from the actual engine speed Ne. The engine speed difference ΔNe is obtained by subtracting the number NeIDL (204).
[0038]
Then, the engine speed difference correction time _TΔNe is searched from the TΔ _Ne table in FIG. 9 (206), and the first speed set time maximum value T _MAX is searched from the vehicle speed table in FIG. The setting time minimum value _TMIN is searched (210).
[0039]
Further, the engine rotational speed difference correction time from the first speed setting time the maximum value _{T MAX} T △ _Ne subtracts seeking first speed set time T (212), the first speed setting time T is less than the minimum value _{T MIN} 1 speed setting time It is determined whether or not (214).
[0040]
If this determination (214) is YES, the first speed setting time minimum value _TMIN is set to the first speed setting time T, then the first speed setting time calculation program is ended (218), and the determination (214) is NO In this case, the first speed set time calculation program is directly ended (218).
[0041]
As a result, during a power-on downshift, it is possible to control the time through the first speed, which is the low speed stage at which the neutral or one-way clutch acts, as a value according to the vehicle speed and the engine speed, and the accelerator from the throttle fully closed state can be controlled. The engine speed synchronization can be controlled more properly in various shifts such as pedal depression, accelerator pedal depression from the throttle opening just before shifting, and the intermediate state between them, and shift shock is reliably reduced. Can do.
[0042]
Further, since it can be dealt with only by changing the program in the control means 18, there is no possibility that the configuration will be complicated, it is easy to manufacture, the cost can be kept low, and it is economically advantageous. is there.
[0043]
Further, the control means 18 is set to the first speed by subtracting a value corresponding to the difference between the engine speed when the throttle is fully closed and the time maximum value of the vehicle speed table, which is the maximum time when shifting from the fully closed throttle. Since the control is performed so as to calculate the time T, the control data can be reduced, which is practically advantageous.
[0044]
Furthermore, the control means 18 is configured to control the limit value of the first speed setting time T by setting the time minimum value in the vehicle speed table, thereby preventing the transit time from becoming extremely short. can do.
[0045]
The present invention is not limited to the above-described embodiments, and various application modifications are possible.
[0046]
For example, in the embodiment of the present invention, a vehicle speed table that is a time maximum value at the time of shifting from when the throttle is fully closed is set, and a value corresponding to the difference between the time maximum value of the vehicle speed table and the engine speed when the throttle is fully closed In order to calculate the first speed setting time T by subtracting the value, the value corresponding to the difference between the engine speed when the throttle is fully closed and the engine speed or the vehicle speed from the maximum time value in the vehicle speed table. It is also possible to adopt a configuration in which control is performed to calculate the first speed set time T, which is the low-speed stage passing time. In other words, in an internal combustion engine with a supercharger, there is a large difference in the speed of increase in engine speed after the accelerator pedal is depressed depending on the engine speed, so the value to be subtracted is the difference between the engine speed and the engine speed (vehicle speed). May be set as a value (a map between the engine speed difference and the engine speed), and as shown in FIG. 11 and FIG. 12, the area not to be searched does not increase, and more detailed setting is possible. .
[0047]
【The invention's effect】
As described above in detail, according to the present invention, in a shift control device for an automatic transmission having a control means for controlling a low-speed stage passing time through a low-speed stage where a neutral or one-way clutch acts during a power-on downshift, A vehicle speed sensor for detecting the vehicle speed and an engine speed detecting means for detecting the engine speed are provided, and detection signals from the vehicle speed sensor and the engine speed detecting means are input, and the time when shifting from when the throttle is fully closed Set the maximum vehicle speed table, and subtract the value corresponding to the difference between the actual engine speed detected by the engine speed detection means and the engine speed when the throttle is fully closed from the maximum time value of this vehicle speed table Since the control means is added to the control means to calculate the low-speed stage transit time, power-on down The time through the low speed stage where the neutral or one-way clutch operates can be controlled as a value according to the vehicle speed and the engine speed during In various shifts such as depression of the accelerator pedal from the opening and intermediate states thereof, the synchronization of the engine speed can be controlled more appropriately, the shift shock can be surely reduced, and the control means is Control for subtracting a value corresponding to the difference between the engine speed when the throttle is fully closed and calculating the first speed setting time from the maximum time value of the vehicle speed table that is the maximum time when shifting from when the throttle is fully closed As a result, the control data can be reduced. Further, since it can be dealt with only by changing the program in the control means, there is no possibility that the configuration will be complicated, the production is easy, the cost can be kept low, and it is economically advantageous. .
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between engine speed and vehicle speed according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of an automatic transmission.
FIG. 3 is a schematic block diagram of an automatic transmission.
FIG. 4 is a schematic system diagram of an automatic transmission.
FIG. 5 is a diagram showing a relationship between a gear position and first and second shift solenoids.
FIG. 6 is a flowchart for main control of a shift control device of an automatic transmission.
FIG. 7 is a flowchart for calculating a first speed setting time of the shift control device of the automatic transmission.
FIG. 8 is a diagram showing a vehicle speed table.
FIG. 9 is a diagram showing a TΔ _Ne table.
FIG. 10 is a diagram showing a vehicle speed table.
FIG. 11 is a diagram illustrating a TΔ _Ne table.
FIG. 12 is a diagram showing a relationship between a difference in engine speed and an engine speed or vehicle speed.
[Explanation of symbols]
2 Automatic transmission 4 Input shaft 6 Torque converter 8 Direct coupling clutch 10 Output shaft 12 Gear transmission mechanism 14 First shift solenoid 16 Second shift solenoid 18 Control means 20 Throttle sensor 22 Vehicle speed sensor 24 Engine speed detection means 26 Shift switch 28 Shifting Step calculation means 30 Shift detection means 32 Power-on detection means 34 Shift timing control means 36 Shift solenoid control means

Claims (2)

In a shift control device for an automatic transmission having a control means for controlling a low-speed passage time through a low-speed stage where a neutral or one-way clutch acts during a power-on downshift, a vehicle speed sensor for detecting the vehicle speed and an engine speed are provided. The engine speed detection means for detecting the engine speed is input, the detection signals of the vehicle speed sensor and the engine speed detection means are input , and a vehicle speed table is set which is the maximum time value when shifting from when the throttle is fully closed. To calculate the time through the low speed stage by subtracting a value corresponding to the difference between the actual engine speed detected by the engine speed detecting means and the engine speed when the throttle is fully closed from the maximum time value in the table. shift control device for an automatic transmission, characterized in that the function of controlling provided in addition to the control means. The shift of the automatic transmission according to claim 1, wherein the control means is a control means for setting a time minimum value in the vehicle speed table and limiting the lower limit value of the low-speed stage passing time. Control device.

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