JP2008019945A - Control system for vehicular automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To respond to demand of quick acceleration or the like according to driver's needs in a vehicular automatic transmission provided with a twin clutch type transmission. <P>SOLUTION: When a step skip shift down switch 15 at a steering wheel 12 is operated, shift down skipping two steps like from seventh speed to fourth speed, from sixth speed to third speed, is executed. In a case of present seventh speed travel, engine speed at a time of shifting from a present operation condition to the fourth speed is estimated. If the engine speed is higher than a predetermined engine speed, control of shift down skipping two steps is canceled even if the step skip shift down switch 15 is operated, or indication 30 not permitting the operation is displayed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control system for a vehicular automatic transmission, and more particularly to a control system for a vehicular automatic transmission that employs a twin clutch transmission having two clutches.

  In today's automobiles, automatic transmissions that automate shifting operations are widespread, but automatic transmissions that perform shifting by operating a mechanical clutch with an actuator are known.

  Patent document 1 is disclosing the automatic transmission provided with two clutches. The twin clutch transmission includes a clutch on each of two coaxially arranged input shafts, and a plurality of speed change gears arranged between the input shaft and the output shaft. Shifting is possible by controlling engagement and disengagement of the second clutch. In particular, for example, when the first clutch is engaged and the second clutch is released, the gear of the gear stage that will be selected next is pre-engaged on the input shaft side related to the second clutch. Thus, when the clutch to be fastened is switched from the first clutch to the second clutch, substantially simultaneous gear shifting becomes possible. Therefore, the twin-clutch transmission can be said to be a transmission that matches the preference of a driver who likes sports driving because quick shifting is possible.

JP 2005-233330 A

  In a twin-clutch transmission, for example, an odd-numbered transmission gear is typically provided on the first input shaft associated with the first clutch, and an even-numbered transmission gear is provided on the second input shaft associated with the second clutch. Therefore, the shift control for upshifting and downshifting is performed by shifting one step at a time. For example, shift-up is performed from 1st speed to 2nd speed, 2nd speed to 3rd speed, and 5th speed to 4th speed, 4th speed to 3rd speed, and 3rd speed to 2nd speed are performed in shift down.

  In an automatic transmission consisting of a combination of a torque converter and a planetary gear, which is most popular in Japan, an automatic transmission mode in which all shifting operations relating to forward movement are entrusted to the transmission control unit, and a manual for performing the shifting operation according to the driver's instructions Many vehicles are equipped with a shift mode. In the manual shift mode, for example, the driver can operate the shift lever to shift up and down one step at a time. For example, a driver who likes sports driving can quickly execute multiple downshifts by selecting the manual mode and quickly operating the shift lever multiple times when overtaking on a highway or starting up at a corner. You may enjoy acceleration using engine speed that generates large torque.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a control system capable of meeting demands such as rapid acceleration according to the needs of a driver in an automatic transmission for a vehicle equipped with a twin clutch transmission.

According to the present invention, the above technical problem is
A plurality of first and second clutches related to the first and second input shafts to which engine driving force is input, and a plurality of portions disposed between the first and second input shafts and the output shaft. In a control system for an automatic transmission for a vehicle having a twin clutch transmission having a transmission gear of a stage,
Gear stage selection means operated by the driver to select a desired gear stage;
Manual shift basic control means for executing a shift one speed at a speed selected by operation of the gear selection means;
There is provided a control system for an automatic transmission for a vehicle, comprising: a step-shift control unit that executes a shift of one step or a plurality of steps when a predetermined operation of the gear step selection unit is detected. Is achieved.

  According to the control system for an automatic transmission for a vehicle of the present invention, for example, when it is desired to perform overtaking acceleration during high-speed traveling, it is possible to immediately perform a shift by using a step-shift control means. It can be accelerated using the engine speed.

  In a preferred embodiment of the present invention, the gear stage selecting means shifts down to a first gear stage or a plurality of gear stages and a second gear to shift down the gear stage. And a second gear stage selecting means is constituted by a switch. Therefore, it is possible to accelerate under a downshift such as a one-step jump only by operating a switch that is easy to operate.

  In an embodiment of the present invention, when the switch of the second gear stage selection means is operated, a shift down control restriction that permits downshifting to one or more shift speeds only when a predetermined condition is satisfied. Have means. According to this, meaningless downshifting can be regulated, for example, even when the engine speed at the time of downshifting becomes a torque peak and the accelerator is depressed, acceleration due to an increase in torque cannot be expected. Execution of downshifting to one or more shift stages can be restricted.

  In the embodiment of the present invention, a determination means for determining whether or not the current operating state can be detected and shifting down to one or a plurality of shift speeds can be permitted, and a result of the determination means is obtained. It further has display means for visually recognizing the driver. According to this, since the driver can know in advance whether or not the shift down control of one or more stages is executed by viewing the display means, the driver's expectation and one or more stages can be determined. Execution of the jump downshift control can be made coincident, and thus safety can be ensured.

  Other objects and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 3 are diagrams showing an outline of a twin clutch transmission as an automatic transmission incorporated in a vehicle equipped with a high-speed engine (typically a rotary engine). It is a figure which shows the related structure. Referring to these drawings, reference numeral 1 denotes a twin clutch transmission, and first and second input shafts 3 and 4 are coaxially arranged in a housing 2 of the transmission 1. 4, first and second clutches 5 and 6 are disposed. An output shaft 7 is disposed in the housing 2 in parallel with the first and second input shafts 3 and 4.

  Between the first input shaft 3 and the output shaft 7 related to the first clutch 5, gears D1, D3, and D5 of the first, third, and fifth gears are disposed. . On the other hand, gears D2 and D4 of the second speed and the fourth speed are arranged between the second input shaft 4 and the output shaft 7 related to the second clutch 6, and will be described later. As described above, the first and second clutches 5 and 6 are selectively engaged to execute a forward five-speed shift. This forward five-stage transmission is merely an example. For example, first, third, fifth, and seventh speed change gears are arranged between the first input shaft 3 and the output shaft 7. In addition, by arranging transmission gears of the second speed, the fourth speed, and the sixth speed between the second input shaft 4 and the output shaft 7, it is possible to execute a forward seven-speed shift. Reference numeral 8 shown in FIG. 1 and the like is a synchro mechanism.

  The engagement and disengagement of the first and second clutches 5 and 6 and the engagement and disengagement of the transmission gears D1 to D5 are performed by a plurality of actuators (not shown), and the operation of these actuators is controlled by electronic control described later. . FIG. 2 shows a state where the third speed gear stage (D3) is selected as an example. At the third speed (D3), the first clutch 5 is engaged and the second clutch 6 is released. In this state, the engine driving force is input from the first clutch 5 and the first input shaft 3 to the third speed gear D3, and is shifted by the third speed gear D3 and output from the output shaft 7. In the state where the third speed gear stage (D3) is selected, the second clutch 6 is in a released state, and the second input shaft 4 is in an idling state.

  FIG. 3 shows a state where the fourth speed (D4) is selected. At the fourth speed (D4), unlike the third speed (D3), the second clutch 6 is engaged and the first clutch 5 is released. Therefore, the engine driving force is input to the fourth speed gear D4 from the second clutch 6 and the second input shaft 4, and is shifted by the fourth speed gear D4 and output from the output shaft 7. In the state where the fourth speed gear stage (D4) is selected, the first clutch 5 is in a released state, and the first input shaft 3 is in an idle state.

  For example, the twin clutch transmission 1 engages the transmission gear D2 or D4 associated with the second input shaft 4 in the idling state when the first clutch 5 is engaged and the second clutch 6 is released. Since the gears can be engaged in advance to prepare for the next shift, the instantaneous shift can be performed by switching the clutches 6 and 7.

  With reference to FIG. 4, the shift control of the twin clutch transmission 1 is performed by a shift control unit 10 constituted by a CPU or the like, and the shift control unit 10 is left to a shift lever 11 (FIG. 5) entrusted to the operation of the driver. In addition, signals from the upshift switch 13, the downshift switch 15 and the step jump downshift switch 15 (FIG. 6) installed on the handle 12 are input.

  Referring to FIG. 5, the shift lever 11 has a D range, a 2nd speed range, and an L range related to forward movement in addition to reverse (R) and neutral (N). For example, when set to the D range, A transmission gear is set according to the operating state quantity such as the accelerator opening (automatic transmission mode). In this automatic shift mode, for example, when the D range is selected, the upshift is executed step by step from the first speed to the second speed, the second speed to the third speed at the time of upshifting, and from the fifth speed to the fourth speed at the time of downshifting. Shift down is performed step by step, such as from 4th speed to 3rd speed (FIG. 7).

  When the shift lever 11 shifts from the D range to the left side through the gate 16, the shift control is switched from the automatic shift mode to the manual shift mode. This manual shift mode has two control modes. In the first basic control mode, when the driver linearly shifts the shift lever 11 to the + side once, a one-stage upshift is executed. Conversely, when the shift lever 11 is linearly shifted once to the-side, a one-stage downshift is executed. In this basic control mode, for example, when it is desired to shift down from the fifth speed to the third speed by two steps, the driver may shift the shift lever 11 to the-side twice.

  In addition to the basic manual shift control described above, in the second control mode of the manual shift mode, if the driver operates the above-described step jump shift down switch 15 in the forward five-stage transmission 1 of the embodiment, As shown in FIG. 8, a two-step jump downshift from the fifth speed to the second speed and from the fourth speed to the first speed is executed. For example, in the case of a forward seven-speed transmission, a downshift of two steps is executed from the seventh speed to the fourth speed, from the sixth speed to the third speed, and from the fifth speed to the second speed (FIG. 9).

  Referring to FIG. 4, in order to execute the control of the transmission 1 described above, the shift control unit 10 includes a shift lever 11, a shift up switch 12, a shift down switch 13, and a step jump shift down switch 15. In addition to the signals, signals from the vehicle speed sensor 20, the accelerator opening sensor 21, the engine load sensor 22, and the brake switch 23 are input. The transmission control unit 10 generates a transmission control signal based on these signals, supplies a clutch engagement signal or a release signal to the first and second clutches 5 and 6, and also transmits the transmission gears D1 to D5. A shift signal is supplied to the transmission mechanism.

  The shift control unit 10 includes a clutch sensor 24 that detects the states of the first and second clutches 5 and 6, and a shaft sensor 25 that detects the rotation states of the first and second input shafts 3 and 4 and the output shaft 7. A signal from the shift sensor 26 that detects the position of the shift lever 11 is input, and the state of the transmission 1 is detected based on these signals, and feedback control is always performed.

  FIG. 10 is a graph showing the relationship between vehicle speed and engine speed in a vehicle equipped with a rotary engine, and the torque characteristics of the rotary engine are as shown in FIG. As can be understood from the torque curve of FIG. 11, the torque peak of this rotary engine is about 7000 revolutions (rpm).

  For example, when traveling at a constant speed of about 130 km / h at the 7th speed, as can be seen from the graph of FIG. 10, the engine speed is about 3000 rpm. At this time, the speed is switched to the manual shift mode and 2 for overtaking acceleration. By operating the step-shift down switch 15, a two-step shift down from the speed to the fourth speed is performed, and by depressing the accelerator, the engine can be accelerated using a rotation region where a large torque is generated. By the way, in 4th speed, it is about 5300 rpm at about 130 Km / h (FIGS. 10 and 11).

  As described above, the two-step jumping down has been described as the first embodiment, but the two-step jumping up can be executed based on the same concept. That is, when one of the two downshift switches 15 and 15 is used as a two-stage jump-up switch and this two-stage jump-up switch is operated, for example, the first to fourth speed, You may make it perform the upshift control of 2 steps | paragraphs like speed to 5 speed.

  In the shift control system of the first embodiment, means for restricting a two-step jump shift is provided. For example, the regulating means calculates and calculates the engine speed when it is assumed that a two-step jump downshift is executed, and when this engine speed is close to the engine speed at which a torque peak occurs, in other words, If it is predicted that the engine generated torque is unlikely to increase in response to depression of the accelerator even if the step-down shift down is executed, control for ignoring the operation of the step-up shift down switch 15 is performed.

  In other words, the two-step jump shift restricting means always determines the engine speed when a two-step jump is performed based on the current vehicle speed, the currently selected shift speed, and, if necessary, the current engine speed. ,Predict. For example, when the two-stage jump downshift switch 15 is operated and the predicted engine speed is smaller than a predetermined threshold value, two-stage jump down control is executed, while the predicted engine speed is set to a predetermined value. When the value is larger than the threshold value, the shift-down control skipping two steps is canceled. Similarly, in the case of this two-step jump upshift control, if it is predicted that the engine speed will be, for example, an engine speed lower than 1000 rpm when the two-step jump upshift is executed, the driver temporarily shifts by two steps. This may be canceled by operating the up switch.

  In addition to the two-step jump shift restricting means, it is preferable to display whether or not the current operation state is an operation state in which a two-step jump shift is permitted. For example, the driver can know in advance that even if the two-step jump downshift switch 15 is operated, for example, by viewing the display that the driving state is incapable of executing the two-step jump downshift. As a representative example, a display in the case of downshift will be described. As this display, a two-step jump down-down disapproval lamp 30 such as a red lamp (see FIG. 4) when the two-step jump down is not permitted. ) Is turned on, and it is meaningless to operate the two-step jump down switch 15, that is, to let the driver recognize through the eyes that it is in an operating state where the two-step jump down is not performed. Good. Another display method is to turn on the two-step jump downshift permission lamp 31 such as a blue lamp when in an operating state in which two-step jump downshift is permitted (FIG. 4). The red lamp 30 may be turned on when the vehicle is in an operation state in which it cannot be performed. In addition, when the driver operates the two-step jump downshift switch 15 in spite of the display indicating that the driving state is not permitted to allow the two-step jump downshift, for example, the buzzer 32 (FIG. 4) is sounded with a sound. Preferably, the driver is alerted and / or the driver is alerted by visual means such as blinking the red lamp 30 to make the driver aware of the fact that the two-step jump down was not performed.

  As the arrangement position of the red lamp 30 and / or the blue lamp 31, the instrument panel 33 (FIG. 6) positioned in front of the handle 12 may be set. The shift down switch 15 may be colored by being incorporated in the operation units 15 and 15. According to this, when the driver tries to operate the two-step jump downshift, the operation part of the downshift switches 15 and 15 is seen, and if this is colored in red, for example, the two-step jump downshift described above is performed. You can know if you are in an unauthorized driving state. Of course, the two-stage jump-down switch 15, 15 has, for example, two red and blue lamps built in, and when the two-stage jump-down is not permitted, the color is changed to red. May be colored blue when in a permitted operating state. In addition, when the operation section of the two-step jump down switch 15 is red (indicating an operation state in which the two-step jump down is not permitted), the driver operates the two-step jump down shift. You may make it switch the red lamp incorporated in the operation part of switch 15 from lighting display to blinking display. Needless to say, the red lamp 30 and the blue lamp 31 include LEDs.

  When the driver sees a lamp indicating that the driving state does not permit the two-step jump downshift, or hears a buzzer sound when operating the two-step jump downshift switch 15, the driver If the downshift control is not executed, instead of this, in order to downshift by itself, the shift lever 11 is immediately shifted to the negative side to accelerate using a transmission gear that is one step lower, or The-side shift will be performed twice and acceleration will be performed using a gear that is two steps lower.

  As described above, the control mode is switched from the automatic transmission mode to the manual transmission mode by shifting the shift lever 11 to the left from the D range (FIG. 5). The operation is merely an operation of lightly touching the shift lever 11 to shift to the negative side. Even if the control of the two-step jump downshift is canceled, the driver instantaneously moves the shift lever 11 in response to this cancellation. It can be operated and shifted down by one stage.

  FIG. 12 illustrates a modification. FIG. 12 relates to a vehicle equipped with a forward seven-stage transmission. Referring to the figure, a switch group 40 for manual shifting is disposed on the handle 12 as an example. The manual shift switch group 40 includes six shift stage selection switches 41 to 46 denoted by numerals 1 to 6. “1” of the first switch 41 means the first speed gear stage, and the first speed gear stage can be selected by pushing this. “2” of the second switch 42 means the second speed gear stage, and the second speed gear stage can be selected by pushing this. “3” of the third switch 43 means the third speed gear stage, and the third speed gear stage can be selected by pushing this. “4” of the fourth switch 44 means the fourth speed gear stage, and the fourth speed gear stage can be selected by pushing this. “5” of the fifth switch 45 means a fifth gear, and the fifth gear can be selected by pushing this. “6” of the sixth switch 46 means a sixth gear, and the sixth gear can be selected by pushing this switch.

  The switch group 40 is a gear that can be selected in the manual mode. For example, the switches 41 to 46 are colored by turning on the lamps built in the switches 41 to 46, so that the driver can select the gears that can be selected. Display is preferred. More specifically, for example, a blue lamp may be incorporated in each of the switches 41 to 46 so that the switch of the selectable shift stage is colored in blue, and conversely, each switch 41 to 46 has a red lamp. , And the currently selectable shift speeds may be indirectly displayed by causing the switch for the shift speeds that cannot be selected to be colored in red and not causing the driver to select a shift speed. Of course, each of the switches 41 to 46 has a built-in blue and red lamp so that the switch of the selectable shift stage is colored in blue and the switch of the non-selectable shift stage is colored in red. Good.

  When the driver pushes the switch of the selectable shift stage among the switches 41 to 46 included in the switch group 40, this signal is input to the shift control unit 10 described above to shift up to the selected shift stage. Alternatively, a downshift is performed.

  The red or blue display of the switch group 40 always calculates the engine speed that can be assumed when the shift control unit 10 is assumed to have shifted to each shift stage based on the current operating state, and Similarly, when the engine speed obtained by calculation is higher than a predetermined engine speed, a display indicating that the downshift to the gear position is not permitted is performed. For example, if the engine speed is, for example, higher than 6000 rpm when shifting to a gear position of 4 speed or less while currently traveling at high speed at 7 speed, the gear speed of 4 speed or less is changed. The red lamps of the stage switches 41 to 44 are turned on. Similarly, when the engine speed obtained by the calculation is lower than the predetermined engine speed, a display that prohibits the upshifting to the gear position is performed. For example, when the engine is currently running at the second speed and is shifted up to a shift speed of 4th speed or higher, the engine speed becomes lower than 1000 rpm. The red lamp of 46 switch is turned on.

  By preparing such a switch group 40, it is possible to shift to a desired gear stage by pushing selectable gear stage selection switches 41 to 46. For example, from the seventh speed to the fifth speed, the seventh speed From the first to the fourth speed, a one-step jump downshift and a two-step jump downshift can be executed by a single operation of the driver.

  Even in the second embodiment, for example, when the driver pushes an unselectable switch colored in red, the shift control unit 10 ignores the signal from the switch and executes the shift control. Needless to say, it is preferable to notify the driver by sound using the buzzer 32 described above that the shift control has been canceled. Further, the red lamp of the switch pushed by the driver is blinked for a predetermined time. Is preferred. As a result, it is possible to notify the driver that the switch operation currently performed by the driver has been canceled on the shift control unit 10 side.

The figure for demonstrating the structure of the twin clutch type transmission of 5 steps | paragraphs of forwards as an illustration of an Example. The figure for demonstrating the state which selected the 3rd speed gear stage in relation to FIG. The figure for demonstrating the state which selected the 4th speed gear stage in relation to FIG. 1 is an overall configuration diagram of a transmission control system according to an embodiment. FIG. The figure for demonstrating an example of the shift lever which can select automatic transmission mode and manual transmission mode. The figure which shows the example of arrangement | positioning of the two-step jump shift down switch provided in the handle | steering-wheel. The figure for demonstrating the upshift control of 1 step | paragraph performed by the basic control in an automatic transmission mode and a manual transmission mode, and a downshift control. The figure for demonstrating the two-step jump downshift performed by operating the two-step jump downshift switch in the manual shift mode in the forward five-stage transmission. The figure for demonstrating the two-step jump downshift performed by operating a two-step jump downshift switch in the manual transmission mode in the forward seven-stage transmission. The figure for demonstrating the change of an engine speed at the time of performing 2 steps | paragraphs and downshifting with the vehicle carrying a 7-speed transmission and a rotary engine. Torque curve of the mounted rotary engine. The figure for demonstrating the example which has arrange | positioned the gear stage selection switch group to the handle | steering-wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Twin clutch type transmission 3 1st input shaft 4 2nd input shaft 5 1st clutch 6 2nd clutch 7 Output shaft D1 1st speed gear D2 2nd speed gear D3 3rd speed gear D4 4th speed gear D5 5th speed gear 10 Shift control unit 11 Shift lever 12 Handle 13 Shift up switch 14 Shift down switch 15 Step jump shift down switch 30 Shift down non-permission lamp 31 Shift down permission lamp 32 Buzzer 40 Shift stage selection switch group 41 First 1st speed selection switch 42 2nd speed selection switch 43 3rd speed selection switch 44 4th speed selection switch 45 5th speed selection switch 46 6th speed selection switch

Claims (7)

A plurality of first and second clutches related to the first and second input shafts to which engine driving force is input, and a plurality of portions disposed between the first and second input shafts and the output shaft. In a control system for an automatic transmission for a vehicle having a twin clutch transmission having a transmission gear of a stage,
Gear stage selection means operated by the driver to select a desired gear stage;
Manual shift basic control means for executing a shift one speed at a speed selected by operation of the gear selection means;
A control system for an automatic transmission for a vehicle, comprising: a step-shifting control unit that executes a shift of one step or a plurality of steps when a predetermined operation of the gear stage selecting unit is detected. The gear stage selecting means includes first gear stage selecting means for shifting the shift stage one by one, and second gear stage selecting means for shifting down to one or a plurality of skipped gear stages,
The control system for an automatic transmission for a vehicle according to claim 1, wherein the second gear selection means is constituted by a switch.   The shift down control restricting means for permitting the downshift to the shift stage of one or more steps only when a predetermined condition is satisfied when the switch of the second gear stage selection means is operated. The vehicle automatic transmission control system described. A means for determining whether or not it is possible to detect the current operating state and permit downshifting to one or more skipped gears;
The control system for an automatic transmission for a vehicle according to claim 3, further comprising display means for allowing a driver to visually recognize a result of the determination means.   If the display means does not satisfy the predetermined condition, the driver is informed in advance that the downshift is not performed to the one or more stepped gears even if the driver operates the second gear selection means. The control system for an automatic transmission for a vehicle according to claim 4, further comprising a disapproval notifying means for notifying.   After notifying the driver that the downshift was not executed to the one or more gear shift stages when the driver operated the second gear stage selection means when the predetermined condition was not satisfied The control system for a vehicle automatic transmission according to claim 5, further comprising a notification unit.   The control system for an automatic transmission for a vehicle according to any one of claims 1 to 6, wherein the second gear stage selection means has a switch group associated with each gear stage.

Images