JP3886181B2 - 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 relates to an improvement of a shift control device having a plurality of shift patterns and capable of switching between an automatic shift mode and a manual mode.
[0002]
[Prior art]
In a shift control device for an automatic transmission employed in a vehicle, in addition to an automatic shift mode that determines a gear position (speed ratio) according to driving conditions such as a vehicle speed VSP and a throttle opening TVO (or an accelerator opening), Similar to conventional manual transmissions, some are known to have a manual mode in which a predetermined gear ratio is set in accordance with a driver's speed change operation. For example, “Quarterly MOVE 1995” is known. As shown on pages 123 and 128 of "SPRING 01" (issued by Sanei Shobo on April 28, 1995), there is also known one that selectively switches between the automatic transmission mode and the manual mode with one shift lever.
[0003]
In addition to the shift positions of “P”, “R”, “N” and “D” of the normal shift switch, an UP and DOWN switch are provided in the shift switch as a manual mode of the automatic transmission, respectively, and the driver's shift lever The gear ratio is relatively changed in accordance with the operation of the above, and the conventional manual can be operated by operating the shift lever from the automatic transmission mode “D range” to the manual mode and operating to the UP or DOWN position. It is possible to set an arbitrary gear ratio as in the case of the transmission.
[0004]
When the shift lever is scanned to the “UP” side, an upshift is commanded to the automatic transmission. Similarly, when the shift lever is operated to the “DOWN” side, a downshift is commanded to the current gear ratio (or shift position). On the other hand, the gear ratio is relatively changed, and such shift control is hereinafter referred to as sequential shift. Note that “P”, “R”, and “N” indicate parking, reverse, and neutral shift positions, respectively.
[0005]
Moreover, as what has the above-mentioned manual modes, there is what is disclosed on pages 9-2 to 9-5 of “NSX Service Manual” (issued by Honda Motor Co., Ltd. in March 1995), In this method, the UP switch and the DOWN switch are provided in the handle column, and the sequential shift is performed as in the manual mode.
[0006]
In this manual mode, when the vehicle is stopped, it is automatically switched to the first speed, which is the maximum LOW gear ratio that can be set by the automatic transmission, and is set so that the driving force can be reliably obtained when starting again. For example, as shown in FIG. 8, when the driver stops while operating at the 4th speed without operating the shift lever, after downshifting from the 4th speed to the 2nd speed in sequence. When the vehicle is stopped, it is downshifted to the first speed, which is the lowest LOW gear ratio, to prepare for the next start.
[0007]
In order to prevent the drive wheels from slipping when starting on low μ roads such as snowy roads, the speed is changed from a speed ratio on the HI side with respect to the maximum LOW speed ratio (for example, the first speed) that can be set by the automatic transmission. An automatic transmission equipped with a so-called “snow pattern” is also known. For example, “New Vehicle Description (Y32-1)” (published by Nissan Motor Co., Ltd., June 1991), page C-25. There is something like this.
[0008]
This is provided with a shift pattern changeover switch for switching the shift pattern, and selects “normal pattern” and “snow pattern” to change the shift pattern in the automatic shift mode. In the automatic transmission mode (D range) in the normal pattern, the automatic transmission shifts between the first speed to the fifth speed according to the driving conditions such as the vehicle speed and the throttle opening based on a preset shift map. However, in the snow pattern, the speed is changed between the second speed or the third speed to the fifth speed on the basis of a shift map of a preset automatic speed change mode (Ds range), and the second speed, the third speed, etc. By starting from a predetermined gear ratio on the HI side, an excessive torque to the drive wheels is suppressed to prevent idling on a low μ road.
[0009]
[Problems to be solved by the invention]
However, in the conventional automatic transmission described above, the shifting operation is performed using a single shift map in the manual mode. Therefore, when the shift pattern is set to the snow pattern and the mode is shifted to the manual mode, the automatic transmission is automatically performed while the vehicle is stopped. Downshifted to 1st gear. For this reason, it is necessary for the driver to set the second speed to the third speed by operating the shift lever to the UP side every time the vehicle restarts, and the shift operation on a low μ road such as a snowy road becomes complicated, In addition, if this upshift operation is not performed, the drive wheel may run idle on a low μ road because it starts from the first speed that is the lowest LOW speed ratio while selecting a snow pattern. In some cases, drivability may be reduced.
[0010]
Therefore, the present invention has been made in view of the above problems, and when the snow pattern is selected in the manual mode of the automatic transmission that automatically downshifts to the LOW side when the vehicle is stopped, the snow pattern is set. Another object of the present invention is to provide a shift control device for an automatic transmission that can start from the lowest LOW gear ratio.
[0011]
[Means for Solving the Problems]
As shown in FIG. 9, according to the first aspect of the present invention, the shift mode switching means 50 for selectively switching between the automatic shift mode and the manual mode of the automatic transmission 10 and the shift pattern of the automatic shift mode according to the driving conditions. Automatic shift pattern setting means 51 that sets a predetermined normal shift pattern and a snow shift pattern in which travel at the lowest LOW speed ratio with respect to the normal shift pattern is set, and the automatic shift pattern setting means. A shift control device for an automatic transmission comprising shift pattern switching means 52 for selecting one of the normal shift pattern and the snow shift pattern;
When the vehicle stop state determination unit 53 for determining the vehicle stop state and the shift mode switching unit select the manual mode and the stop state determination unit determines the stop state, the vehicle shifts down to the LOW side gear ratio. Start preparation means 54, and when the shift pattern switching means 52 has selected the normal shift pattern, this start preparation means downshifts to the maximum LOW speed ratio set in the normal shift pattern, When the snow shift pattern is selected, the downshift to the maximum LOW speed ratio set in the snow shift pattern and the driver selects the maximum LOW speed ratio set in the normal shift pattern by the shift operation. A downshift to the lowest LOW gear ratio set in the normal shift pattern is prohibited .
[0012]
The second aspect of the present invention, in the first aspect of the present invention, the normal shift pattern is set as the shift pattern for the normal running, the snow shift pattern, Ru is set as the shift pattern for the low μ road.
[0013]
In a third aspect based on the second aspect, the maximum LOW speed ratio set by the snow shift pattern is set to be higher than the maximum LOW speed ratio that can be set by the automatic transmission .
[0014]
According to a fourth aspect of the present invention, there is provided a shift mode switching for selectively switching between an automatic shift mode of an automatic transmission that shifts in a predetermined shift pattern according to a driving condition and a manual mode that shifts according to a driver's driving operation. Means 50, a shift pattern switching means 52 for selecting at least one of a normal shift pattern for normal driving and a snow shift pattern for low μ road driving, and the snow shift pattern is selected by the shift pattern switching means 52. A shift control device for an automatic transmission comprising start preparation means 54 for starting from a gear ratio on the HI side with respect to a maximum LOW gear ratio that can be set by the automatic transmission.
When the shift mode switching means 50 selects the manual mode, the start preparation means 54 is higher than the maximum LOW speed ratio that can be selected in the manual mode when the shift pattern switching means 52 selects the snow shift pattern. Starting from the side , even if the driver selects the maximum LOW transmission ratio set in the normal transmission pattern by the shift operation, the downshift to the maximum LOW transmission ratio set in the normal transmission pattern is prohibited. .
[0016]
【The invention's effect】
Accordingly, a first aspect of the present invention, when riding in manual mode, at the time of restarting after stopping can start from the lowest LOW gear ratio set in snow pattern, as in the conventional example, in the manual mode of snow pattern There is no need to upshift to 2nd speed every time you start again after decelerating and stopping, reducing complicated shift operations and improving the operability of manual mode with multiple shift turns, , when traveling in the manual mode in the conventional example, when the driver forgets that the snow pattern, but there are cases where you start first speed causing slipping of the driving wheel at low μ road, select It is possible to start from the lowest LOW gear ratio according to the changed gear shift pattern, improving the operability and drivability of the automatic transmission with multiple gear shift patterns and manual mode. Rukoto is to become possible.
[0017]
According to a second aspect of the present invention, when the shift pattern in the automatic shift mode is set from a normal pattern for normal driving and a snow shift pattern for low-μ road driving, and the snow pattern is selected, the vehicle is also stopped in the manual mode. Therefore, the operability and drivability of the automatic transmission having the snow shift pattern and the manual mode can be improved.
[0018]
In the third aspect of the invention, since the maximum LOW speed ratio is set to be higher than the maximum LOW speed ratio that can be set by the automatic transmission in the snow speed pattern in both the automatic speed mode and the manual mode, This makes it possible to smoothly restart the vehicle after stopping on the road, and to improve the operability and drivability of the automatic transmission having the snow shift pattern and the manual mode.
[0019]
In the fourth aspect of the invention, in the manual mode of the snow shift pattern, the HI side gear ratio becomes the maximum LOW gear ratio than the maximum LOW gear ratio that can be set by the automatic transmission, and the vehicle stops on a low μ road such as a snowy road. The subsequent re-start can be performed smoothly, and the operability and drivability of the automatic transmission having the snow shift pattern and the manual mode can be improved.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0022]
FIG. 1 shows an automatic transmission mode that automatically changes a gear ratio (or a gear position, the same applies hereinafter) according to a driving state of a vehicle, in addition to a plurality of transmission patterns of a normal pattern and a snow pattern, and a driver's operation 1 shows an automatic transmission device having a manual mode in which an arbitrary transmission gear ratio can be selected, and an automatic transmission 10 connected to the engine 11 changes the transmission gear ratio in accordance with a command from the transmission control controller 1. Therefore, here, the automatic transmission 10 is configured with the fourth speed, and the shift is performed to the shift stage according to the GEAR position commanded from the shift controller 1.
[0023]
The shift control controller 1 is mainly composed of a microcomputer. As shown in FIG. 1, a signal from the shift switch 2 corresponding to the operation of the shift lever 3 operated by the driver, and the conventional example, as shown in FIG. In response to a signal from a shift pattern changeover switch 8 that selectively switches between a normal pattern that is a shift pattern for normal driving and a snow pattern that is suitable for driving on a low μ road such as a snowy road, a plurality of such patterns are described. A shift map corresponding to the driver's operation is selected from the shift map, and further, a vehicle speed VS is read from the vehicle speed sensor 7 and a throttle valve opening TVO (not shown) is read from the throttle opening sensor 6 as vehicle driving conditions. Then, a gear ratio is set based on the selected shift map, and a command is sent to the automatic transmission 10.
[0024]
Here, in the storage means (not shown) of the shift controller 1, shift maps for the automatic shift mode and the manual mode are set as described later, corresponding to the two shift patterns of the normal pattern and the snow pattern. .
[0025]
In order to select these shift modes, the selector switch 2 of the shift lever 3 is provided with an “H” type gate as shown in FIG. 1, and in addition to the “D” range which is an automatic shift mode, An UP switch 4 ("+" in the figure) and a DOWN switch 5 ("-" in the figure) for shifting are provided. By operating the shift lever 3 from the D range position in FIG. The mode is switched from the automatic transmission mode to the manual mode.
[0026]
In this manual mode, the gear position is sequentially changed in accordance with the stroke of the shift lever 3 in the front-rear direction (vertical direction in FIG. 1). When the shift lever 3 is operated to the “+” side, When the shift lever 3 is operated to the “−” side, the automatic transmission 10 is instructed to downshift from the current shift stage. .
[0027]
Further, a shift pattern changeover switch 8 is provided for switching the shift pattern, and by operating this switch 8, a normal pattern for normal driving and a snow pattern for low μ road are set alternatively. Is done.
[0028]
Next, an example of the control performed by the speed change controller 1 is shown in the flowchart of FIG. 2 and will be described in detail with reference to this flowchart. This flowchart is executed every predetermined time, for example, every 10 msec.
[0029]
First, in step S1, the shift mode selected by the driver from the signal of the selector switch 2 is read. In FIG. 1, when the shift lever 3 is in the “D” position, the automatic shift mode is set, and when the shift lever 3 is on the “+” or “−” side, the manual mode is set for performing manual shift.
[0030]
Next, in step S2, the signal of the shift pattern changeover switch 8 is read to set one shift pattern of a normal pattern for normal travel and a snow pattern for low μ road travel.
[0031]
In step S3, it is determined whether or not the shift mode read in step S1 is the manual mode. If the shift mode is the manual mode, the process proceeds to step S4 to select a shift map for the manual mode. If so, the process proceeds to step S7 and subsequent steps.
[0032]
If the shift mode is the manual mode, it is determined in step S4 whether or not the shift pattern read in step 2 is a snow pattern. If it is a snow pattern, the process proceeds to step S5, as shown in FIG. The shift map in the manual mode (M1s, M2s to M4 range) of the snow pattern is selected. On the other hand, if the shift pattern is a normal pattern, the process proceeds to step S6, and as shown in FIG. 5, a shift map of the normal pattern manual mode (M1 to M4 range) is selected.
[0033]
If it is determined in step S3 that the shift mode is the automatic shift mode, it is determined in step S7 whether or not the shift pattern read in step 2 is a snow pattern. Then, as shown in FIG. 3, a shift map in the automatic shift mode (Ds range) of the snow pattern is selected.
[0034]
On the other hand, in the case of the normal pattern, the process proceeds to step S9, and as shown in FIG. 4, a normal mode manual mode (hereinafter referred to as D range) shift map is selected.
[0035]
Thus, after selecting a preset shift map from the shift mode corresponding to the position of the shift lever 3 and the shift pattern corresponding to the shift pattern switch 8, the throttle opening TVO and the vehicle speed VSP are set in the automatic shift mode. Set the corresponding gear.
[0036]
Here, each shift map will be described. First, the shift pattern in the automatic shift mode (D range) of the normal pattern in FIG. 3 is conventionally used, and the upshift line indicated by the solid line in the figure is It is set to upshift from the 1st speed, which is the highest LOW speed ratio that can be set by the automatic transmission, to the 4th speed, which is the highest HI speed ratio, according to the vehicle speed. If so, the upshift is sequentially performed from the first speed to the fourth speed as the vehicle speed increases.
[0037]
Similarly, the downshift line indicated by the broken line in the figure is also set according to the vehicle speed VSP and the throttle opening TVO, and if the vehicle is running at the 4th speed and then decelerating with the throttle closed, it stops. A downshift is performed from the fourth speed to the first speed.
[0038]
With respect to the normal pattern D range, in the snow pattern automatic shift mode (Ds range) shown in FIG. 4, from the shift map of the D range shown in FIG. The shift range is changed from 2nd to 4th by removing the downshift line from 1st to 1st. Like the previous example, the lowest LOW speed ratio is 2nd, and start and acceleration on low μ roads. Is to be performed smoothly.
[0039]
On the other hand, a normal pattern and a snow pattern corresponding to the above-described shift pattern are also set in the shift map in the manual mode, and the shift pattern of the normal pattern (M1 to M4 range) is shown in FIG. 5 and the snow pattern (M1s, M2s to M4 range). ) Is shown in FIG.
[0040]
In the manual mode of the normal pattern in FIG. 5, an upshift line from 1st speed to 4th speed and a downshift line from 3rd speed to 1st speed are set according to the vehicle speed, respectively (A) to (D) in the figure. As shown in FIG. 4, manual shifting is performed by setting the M1, M2, M3, and M4 ranges, respectively, and turning on the UP switch 4 or the DOWN switch 5 with the shift lever 3.
[0041]
Each of the shift ranges M1 to M4 can be set between the downshift line and the upshift line. As shown in FIG. 5A, in the M1 range, between the vehicle speed = 0 and the upshift line. The first speed can be used, and the downshift from the second speed to the first speed is carried out when the vehicle speed is below the downshift line set to vehicle speed> 0 km / h as shown in (B).
[0042]
In this normal pattern manual mode, the driver can set an arbitrary gear position within the usable range of each range M1 to M4, and when the driver decelerates and stops without performing a shift operation, the above-mentioned conventional example is described. As described above, the shift is automatically performed to the first speed according to each downshift line, and the next start is smoothly performed.
[0043]
As shown in FIG. 6, the manual mode of the snow pattern used on a low μ road is the M1s range in which the M1 and M2 ranges of the normal pattern are changed and the upshift lines and downshift lines of the first and second speeds are changed. The M2s range is the same, and the 3rd and 4th speed M3 and M4 ranges are the same.
[0044]
In the snow pattern (Ds range) in the automatic transmission mode, the maximum transmission speed ratio to be set is set to the second speed, and the same transmission ratio is set to the maximum transmission ratio in the manual mode. Set the vehicle speed to 0 km / h. In other words, even when the vehicle is stopped, the maximum LOW speed ratio becomes the second speed, and the vehicle can start from the second speed that is the same as the Ds range.
[0045]
On the other hand, in the M2s range, the downshift line from the 2nd speed to the 1st speed is set to the vehicle speed = 0 km / h, and as described above, when the vehicle is decelerated and stopped, it is always downshifted to the 2nd speed and down to the 1st speed. Shifting can be prohibited.
[0046]
Thus, the manual mode shift map is set corresponding to two shift patterns of normal and snow, respectively. In the snow pattern manual mode, the maximum LOW speed ratio to be set is the same as the automatic shift mode Ds range of the snow pattern. Therefore, even when the vehicle is decelerated and stopped in the snow pattern manual mode, downshifting to the first speed is prohibited as shown in FIG. 7, and the snow pattern shifts from the second speed to the fourth speed even in the manual mode. It becomes a range.
[0047]
Therefore, unlike the conventional example, it is no longer necessary to perform an upshift operation to the second speed every time the vehicle starts again after decelerating and stopping in the snow pattern manual mode. In the conventional example, when driving in the manual mode, if the driver forgets that he / she is in a snow pattern, he / she starts from the first speed and the driving wheels on the low μ road Although there was a case where idling occurred, the automatic transmission 10 can be set so that the maximum LOW speed ratio in the manual mode in the snow pattern is set to be the same as the maximum LOW speed ratio in the automatic speed change mode as in the present embodiment. Because the downshift to the maximum LOW speed ratio (= 1st speed) is prohibited, the driver can select either the automatic shift mode or the manual shift mode. Can be performed starting from the lowest LOW gear ratio corresponding to the selected shift pattern is the is possible to improve the operability and the operation of the automatic transmission equipped with a snow pattern and manual mode.
[0048]
In the above embodiment, the maximum LOW speed ratio of the snow pattern is set to the second speed, but it may be set to the third speed. In addition to the normal and snow, the speed change pattern includes many speed change patterns such as a par pattern. In some cases, a manual mode shift map can be set for each shift pattern.
[0049]
Although an example in which the manual mode UP switch 4 and the DOWN switch 5 are operated in accordance with the displacement of the shift lever 3 has been shown, these switches are not shown in the figure, but they are used for a steering wheel, a steering column, an instrument panel, or the like. It can also be arranged.
[0050]
Moreover, although the case where the automatic transmission device 1 is configured by the stepped automatic transmission 10 is shown in the above embodiment, the same operation and effect can be achieved even when the automatic transmission is configured by a V-belt type or a toroidal type. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram of an automatic transmission apparatus showing an embodiment of the present invention.
FIG. 2 is a flowchart showing an example of control performed by a shift control controller.
FIG. 3 shows a normal range D range shift map according to vehicle speed and throttle opening.
FIG. 4 shows a Ds range shift map of a snow pattern according to vehicle speed and throttle opening.
FIG. 5 shows a shift map of an M range of a normal pattern according to the vehicle speed.
FIG. 6 shows a shift map of the Ms range of the snow pattern according to the vehicle speed.
FIG. 7 is a shift diagram showing the downshift timing at the time of deceleration stop in the manual range of the snow pattern.
FIG. 8 is a shift diagram showing a downshift timing at a deceleration stop in a manual range of a snow pattern.
FIG. 9 is a claim correspondence diagram corresponding to any one of the first to fifth inventions.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shift control controller 2 Selector switch 3 Shift lever 4 UP switch 5 DOWN switch 6 Throttle opening sensor 7 Vehicle speed sensor 8 Shift pattern switching switch 10 Automatic transmission 11 Engine 50 Shift mode switching means 51 Automatic shift pattern setting means 52 Shift pattern switching Means 53 Stop state determination means 54 Start preparation means 55 Manual mode shift pattern setting means

Claims (4)

Shift mode switching means for selectively switching between automatic shift mode and manual mode of the automatic transmission;
Automatic shift pattern setting in which the shift pattern of the automatic shift mode is set to a normal shift pattern that is predetermined according to driving conditions and a snow shift pattern in which traveling at the maximum LOW speed ratio is restricted with respect to the normal shift pattern Means,
A shift control device for an automatic transmission comprising: a shift pattern switching means for selecting one of a normal shift pattern and a snow shift pattern set in the automatic shift pattern setting means;
Stop state determination means for determining the stop state of the vehicle;
A start preparation means for downshifting to a LOW side gear ratio when the shift mode switching means selects a manual mode and the stop state determination means determines a stop state;
When the shift pattern switching means selects the normal shift pattern, the start preparation means downshifts to the maximum LOW speed ratio set in the normal shift pattern and selects the snow shift pattern. Downshifts to the maximum LOW transmission ratio set in the snow transmission pattern, and even if the driver selects the maximum LOW transmission ratio set in the normal transmission pattern by the shift operation, the maximum transmission speed set in the normal transmission pattern is set. A shift control device for an automatic transmission, wherein a downshift to a LOW gear ratio is prohibited .   2. The automatic transmission shift according to claim 1, wherein the normal shift pattern is set as a shift pattern for normal travel, and the snow shift pattern is set as a shift pattern for low μ road travel. Control device.   3. The shift control apparatus for an automatic transmission according to claim 2, wherein a maximum LOW transmission ratio set by the snow transmission pattern is set to be higher than a maximum LOW transmission ratio settable by the automatic transmission. . Shift mode switching means for selectively switching between an automatic shift mode of an automatic transmission that shifts in a predetermined shift pattern according to driving conditions and a manual mode that shifts according to a driving operation of the driver;
Shift pattern switching means for selecting at least one of a normal shift pattern for at least normal driving and a snow shift pattern for low μ road driving;
A shift control device for an automatic transmission comprising start preparation means for starting from a gear ratio on the HI side with respect to a maximum LOW gear ratio that can be set by the automatic transmission when a snow gear shift pattern is selected by the gear shift pattern switching means. In
When the shift mode switching means has selected the manual mode, the start preparation means has a shift on the HI side with respect to the maximum LOW speed ratio selectable in the manual mode if the shift pattern switching means has selected the snow shift pattern. Starting from the ratio , even if the driver selects the maximum LOW transmission ratio set in the normal transmission pattern by the shift operation, the downshift to the maximum LOW transmission ratio set in the normal transmission pattern is prohibited . A shift control apparatus for an automatic transmission.

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