JPH1061755A - Control device of automatic transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an automatic transmission for a vehicle facilitating operation even in running by a gear shift of the lowest speed stage in a manual transmission mode. SOLUTION: By an engine brake control means 96, in a manual speed change mode, by applying an engine brake to act in the other gear stage except a 1-speed gear stage which is a transmission of the lowest speed of an automatic transmission 14, a strong engine brake caused by the 1-speed gear shift is prevented from acting in a vehicle. In the case of deciding a running condition using the 1-speed gear stage in the automatic transmission 14 by a lowest speed gear stage running decision means 98, and in the case of deciding a drive running condition of the vehicle by a drive running condition decision means 100, since a transmission to this 1-speed gear stage is permitted by a manual transmission control means 92, only at drive running time without acting of the engine brake, running of the vehicle can be made by large drive power by the 1-speed gear stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art When an automatic transmission mode is selected, an automatic transmission control means for automatically switching a gear position of an automatic transmission based on an actual running state of a vehicle from a preset shift diagram. When a manual shift mode is selected, there is known a control device for a vehicle automatic transmission including: a manual shift control unit that switches a gear position of the automatic transmission in response to an operation of a manual switching operation device. ing. For example, this is the control device for an automatic transmission described in Japanese Patent Application Laid-Open No. 6-286493. According to such an automatic transmission control device, the shift lever provided in the vicinity of the steering wheel is operated to the shift gate for manual shift to set the shift mode to the manual shift mode, and the shift lever is further moved to the upper upshift position. Alternatively, a desired gear position is selected by operating the shift position. According to such a control device, generally, even in an automatic transmission, a gear position according to a driver's preference can be selected, and shift response is enhanced, so that sports performance of the vehicle can be suitably obtained.

By the way, in the automatic transmission control device described above, when the manual mode is selected, generally, in order to enhance the sports performance of the vehicle, the selection is made in response to the operation of the manual switching operation device. In addition to fixing the set gear stage as it is, the engine brake is applied at each gear stage.

[0004]

However, for example, if the engine brake is applied in each gear when the manual mode is selected as described above, the engine braking operation in the lowest gear is too strong. Driving was difficult for the elderly. Such inconvenience is caused not only when the selected gear is fixed as it is in response to the operation of the manual switching operation device in the manual mode as described above, but also in the lower gear in the gear switching range. The same applies to the case where the shift range limited to the above range is selected in response to the operation of a predetermined operating body or switch. In particular, when the gear position of the automatic transmission is increased to, for example, five or more forward speeds in order to enhance the acceleration performance, such inconvenience is remarkable, and a strong driving force or an acceleration force during acceleration running of the vehicle is required. It has been difficult to simultaneously obtain an appropriate engine braking force during deceleration travel.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic transmission for a vehicle which can be easily driven even at the lowest gear in a manual shift mode. It is to provide a control device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is to provide an automatic transmission for a vehicle in which an engine brake at a lowest gear is deactivated. A minimum-gear-speed travel determining means for determining whether or not the automatic transmission is in a traveling state in which a minimum-speed gear is used; and The driving traveling state determining means for determining whether or not the vehicle is in a driving traveling state, and the driving state in which the lowest speed gear is used in the automatic transmission is determined by the lowest speed gear traveling determining means, and the driving traveling is performed. In a case where the driving state of the vehicle is determined by the state determining unit, the vehicle includes a manual shift control unit that allows a shift to the lowest gear.

[0007]

According to the first aspect of the invention, since the strong engine brake caused by the lowest gear position does not act on the vehicle, the vehicle can be easily driven in the lowest gear by manual operation. In addition, when the vehicle is in the driving state at the lowest gear, the shift to the lowest gear associated with the operation of the manual switching operation device is performed. The vehicle can run with a large driving force due to the steps.

[0008]

According to a second aspect of the present invention, there is provided a vehicle for a vehicle in which an engine brake of a lowest gear is deactivated. A control device for an automatic transmission, wherein when a lowest gear is commanded by a manual operation, whether or not the vehicle after the achievement of the lowest gear is predicted to be in a non-driving state is determined. The post-shift drive traveling state prediction determining means for determining whether the vehicle is in the non-drive traveling state after the lowest gear is achieved by the post-shift drive traveling state prediction determining means. And manual shift control means for selecting a gear higher than the lowest gear.

[0009]

According to the second aspect of the invention, since the strong engine brake caused by the lowest gear is not applied to the vehicle, the vehicle can be easily driven in the lowest gear by manual operation. That is, when it is predicted that the vehicle after the lowest gear is achieved will be in the non-drive running state,
Since the lowest gear is prohibited and a gear higher than the lowest gear is selected, there is an advantage that the vehicle can travel with an appropriate engine braking action in the non-drive traveling state.

[0010]

A third aspect of the present invention to achieve the above object is a vehicle for a vehicle configured such that an engine brake in a lowest gear is deactivated. A control device for an automatic transmission, comprising: a manually operated vehicle stop determining unit that determines whether the vehicle is stopped in a state where a manual operation related to a shift is performed; If it is determined that the gear is stopped, a manual shift control means for selecting the lowest gear is included.

[0011]

According to the third aspect of the invention, since the strong engine brake caused by the lowest gear position does not act on the vehicle, the vehicle can be easily driven in the lowest gear by manual operation. In addition, during driving while the engine brake is not applied, the vehicle can be driven with a large driving force due to the lowest gear.

[0012]

A fourth aspect of the present invention for achieving the above object is to determine whether or not a vehicle is running at a lowest gear by manual operation. Means for determining whether the vehicle is traveling in deceleration, a deceleration traveling determination means for determining whether or not the vehicle is traveling in deceleration, and a means for determining whether the vehicle is traveling in deceleration at the lowest gear. Manual shift control means for inhibiting the lowest gear and selecting a higher gear than the lowest gear when it is determined that the vehicle is decelerating and the vehicle is determined to be decelerating traveling by the deceleration traveling determining means. And to include.

[0013]

According to the fourth aspect of the invention, when the vehicle is running at a reduced speed, the lowest gear is prohibited by the manual shift control means, and a gear higher than the lowest gear is selected. Therefore, the vehicle can travel with an appropriate engine braking action in a deceleration traveling state in which the operation amount of the accelerator pedal is zero. For this reason, the strong engine brake caused by the lowest gear position does not act on the vehicle, so that driving in the lowest gear position by manual operation becomes easier.

[0014]

A fifth aspect of the present invention to achieve the above-mentioned object is to provide a vehicle in which an automatic transmission has a minimum gear position while the vehicle is running. A lowest speed gear shift mode switching determining means for determining whether or not the mode has been switched from the brake non-operating mode to the engine brake operating mode; a deceleration traveling determining means for determining whether or not the vehicle is decelerating; The medium speed gear mode switching determination means determines that the automatic transmission has been switched from the engine brake non-operation mode to the engine brake operation mode during traveling of the vehicle in the lowest gear, and the deceleration traveling determination is performed. Means for prohibiting the lowest gear and selecting a higher gear than the lowest gear when the means determines that the vehicle is running at a reduced speed. Some that include.

[0015]

According to the fifth aspect of the present invention, when the vehicle is switched from the engine brake non-operation mode to the engine brake operation mode while the vehicle is traveling at the lowest gear, and the vehicle is determined to be decelerated, The manual shift control means prohibits the lowest gear and selects a higher gear than the lowest gear, so that the vehicle travels with an appropriate engine braking effect in a deceleration running state in which the accelerator pedal operation amount is zero. There are advantages that can be done. For this reason, the strong engine brake caused by the lowest gear position does not act on the vehicle, so that driving in the lowest gear position by manual operation becomes easier.

[0016]

In another preferred embodiment of the present invention, an automatic shift mode in which a plurality of gears are automatically switched according to the running state of the vehicle and a manual shift mode in which a gear is switched in response to a manual shift operation. In the control device for a vehicle automatic transmission having, when the manual shift mode is selected, the engine brake control means for applying an engine brake to other gears except the lowest gear of the automatic transmission,
It has been provided. With this configuration, the engine brake is applied by the engine brake control means to the other gears except the lowest gear of the automatic transmission in the manual shift mode. Even when the lowest gear is selected, since the strong engine brake caused by the lowest gear does not act on the vehicle, driving at the lowest gear is facilitated.

Preferably, the control device for an automatic transmission for a vehicle determines a minimum speed gear for determining whether or not the automatic transmission is in a running state in which a minimum speed is used in the manual shift mode. Step traveling determining means, driving traveling state determining means for determining whether the vehicle is in a driving traveling state,
When the lowest-speed gear position determining means determines that the vehicle is in a traveling state in which the automatic transmission uses the lowest-speed gear position, and the driving condition determining unit determines that the vehicle is in a driving state, And manual shift control means for executing a shift to a gear. With this configuration, when the vehicle is in the driving traveling state at the lowest gear, the shift to the lowest gear related to the operation of the manual switching operation device is performed. However, the vehicle can run with a large driving force due to the lowest gear.

Preferably, the control device for an automatic transmission for a vehicle, when the lowest gear is commanded in accordance with the operation of the manual switching operation device in the manual shift mode, sets the lowest gear. The post-shift drive running state prediction determining means for determining whether or not the vehicle after the achievement is predicted to be in the non-drive running state, and the lowest gear stage is achieved by the post-shift drive running state prediction determining means. And manual shift control means for prohibiting the lowest gear and selecting a higher gear than the lowest gear when the subsequent vehicle is predicted to be in the non-driving state. With this configuration, when the vehicle is predicted to be in the non-driving state after the lowest gear is achieved, the lowest gear is prohibited, and a gear higher than the lowest gear is selected. Therefore, there is an advantage that the vehicle can travel with an appropriate engine braking action in the non-drive traveling state.

Preferably, the manual shift control means is provided when the post-shift drive traveling state predicting / judging means does not predict that the vehicle after the lowest gear has been attained will be in the non-drive traveling state, If traveling is expected, the lowest gear is selected and the automatic transmission is switched to the lowest gear. With this configuration, the vehicle can be driven with a large driving force due to the lowest gear when the vehicle is driven with no engine brake applied.

Preferably, the control device for an automatic transmission for a vehicle further comprises a traveling speed determining means for determining whether or not the vehicle is traveling at a lowest speed in a manual shifting mode. A deceleration traveling determination unit that determines whether the vehicle is traveling at a reduced speed; and a deceleration traveling determination unit that determines that the vehicle is traveling at the lowest speed by the lowest speed gear traveling determination unit. And the manual shift control means for prohibiting the lowest gear and selecting a gear higher than the lowest gear when it is determined that the vehicle is traveling at a reduced speed. With this configuration, when the vehicle is traveling in deceleration, the lowest gear is prohibited by the manual shift control means, and a gear higher than the lowest gear is selected. There is an advantage that the vehicle can travel with an appropriate engine braking action in a deceleration traveling state where is zero.

Preferably, the vehicle further includes a manual shift mode vehicle stop determining means for determining that the vehicle has stopped in the manual shift mode. The manual shift control means includes a manual shift mode vehicle stop determining means. If it is determined that the vehicle has stopped in the manual shift mode, the lowest gear is selected and the automatic transmission is switched to the lowest gear. In this way, when the vehicle starts running when the vehicle restarts, the vehicle can run with a large driving force due to the lowest gear.

[0022] Preferably, the control device for an automatic transmission for a vehicle is configured to determine whether or not the automatic transmission mode is switched to the manual transmission mode during traveling of the vehicle in which the automatic transmission is set to the lowest gear. The lowest speed gear shift mode switching determining means for determining whether the vehicle is in deceleration running, and the lowest speed gear shift mode switching determining means for determining whether the automatic transmission If it is determined that the automatic shift mode has been switched to the manual shift mode during traveling of the vehicle that is set to the high gear, and the deceleration traveling determination unit determines that the vehicle is decelerated, the minimum speed Manual shift control means for inhibiting the gear and selecting a higher gear than the lowest gear.
With this configuration, the automatic transmission mode is switched to the manual transmission mode while the vehicle is traveling at the lowest gear, and if the vehicle is determined to be decelerating, the manual transmission control means causes Since the gear is prohibited and a gear higher than the lowest gear is selected, there is an advantage that the vehicle can travel with an appropriate engine braking action in a decelerating traveling state in which the accelerator pedal operation amount is zero.

Preferably, the manual shift control means is provided when the vehicle is not decelerating when switching from the automatic shift mode to the manual shift mode during traveling of the vehicle in the lowest gear. The lowest gear is selected and the automatic transmission is switched to the lowest gear. This allows the vehicle to run with a large driving force due to the lowest gear when the vehicle is not driven by the engine brake.

[0024] Preferably, when the lowest gear is prohibited by the manual shift control means, a lock-up clutch provided in a fluid transmission device between the engine and the automatic transmission is engaged. Alternatively, lock-up clutch engagement increasing means for increasing the engagement force is further provided. With this configuration, the engagement area or the engagement force of the lock-up clutch when the lowest gear is prohibited is increased, so that the effect of the engine braking action is further enhanced. An appropriate magnitude of engine braking action is obtained, which is not so great but is greater than with a gear higher than its lowest gear.

[0025] Preferably, when a higher gear than the lowest gear is selected by the manual switching operation device, the manual shift control means selects a gear corresponding to the operation. Switch automatic transmission.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a skeleton diagram showing an example of an automatic transmission for a vehicle that is controlled by a shift control device according to an embodiment of the present invention. In the figure, an output of an engine 10 is input to an automatic transmission 14 via a torque converter 12,
The power is transmitted to drive wheels via a differential gear device and an axle (not shown).

[0028] The torque converter 12
Pump impeller 18 connected to crankshaft 16
, A turbine runner 22 connected to the input shaft 20 of the automatic transmission 14, a lock-up clutch 24 directly connecting between the pump impeller 18 and the turbine runner 22, and a one-way clutch 26 that prevents rotation in one direction. And a stator 28 that is in the position.

The automatic transmission 14 includes a first transmission 30 for switching between high and low gears, and a second transmission 32 for switching between a reverse gear and four forward gears. The first transmission 30 includes an HL planetary gear unit 34 including a planetary gear P0 rotatably supported by the sun gear S0, the ring gear R0, and the carrier K0 and meshed with the sun gear S0 and the ring gear R0; The clutch C0 and the one-way clutch F0 are provided between the sun gear S0 and the housing 41 and the clutch B0 is provided between the sun gear S0 and the housing 41.

The second transmission 32 has a first planetary gear unit 36 comprising a sun gear S1, a ring gear R1, and a planet gear P1 rotatably supported by the carrier K1 and meshed with the sun gear S1 and the ring gear R1.
, Sun gear S2, ring gear R2, and carrier K
2, a second planetary gear set 38 comprising a planet gear P2 rotatably supported by the sun gear S2 and the ring gear R2, and a sun gear rotatably supported by the sun gear S3, the ring gear R3, and the carrier K3. And S3 and a third planetary gear set 40 including a planetary gear P3 meshed with the ring gear R3.

The sun gear S1 and the sun gear S2 are integrally connected to each other, the ring gear R1, the carrier K2, and the carrier K3 are integrally connected, and the carrier K3 is connected to the output shaft 42. Further, a ring gear R2 is integrally connected to the sun gear S3. A clutch C1 is provided between the ring gear R2 and the sun gear S3 and the intermediate shaft 44, and the sun gear S1 and the sun gear S3 are provided.
A clutch C2 is provided between the clutch shaft 2 and the intermediate shaft 44. A band-type brake B1 for stopping rotation of the sun gear S1 and the sun gear S2 is provided on the housing 41.
It is provided in. A one-way clutch F1 is provided between the housing 41 and the sun gear S1 and the sun gear S2.
And a brake B2 are provided in series. The one-way clutch F1 is configured to be engaged when the sun gear S1 and the sun gear S2 try to reversely rotate in the direction opposite to the input shaft 20.

A brake B3 is provided between the carrier K1 and the housing 41, and a brake B4 and a one-way clutch F2 are provided between the ring gear R3 and the housing 41 in parallel. This one-way clutch F
2 is configured to be engaged when the ring gear R3 attempts to rotate in the reverse direction.

In the automatic transmission 14 configured as described above, for example, according to the operation table shown in FIG. 2, the automatic transmission 14 is switched to one of the first reverse gear and the five forward gears having sequentially different speed ratios. In FIG. 2, a circle indicates an engaged state, a blank indicates a released state, and a solid circle indicates an engaged state during engine braking. In the first gear, which is the lowest gear, the engine brake can be generated by the engagement of the brake B4. However, in the present embodiment, the engagement of the brake B4 is not performed in the first gear. Has become. In the automatic transmission 14 of the present embodiment, the first to third gear stages are gear trains in which engine braking is not generated, but the second and third gear stages are required. The engine brake is generated by engaging the clutch C0 or the brake B1 accordingly. The fourth gear and the fifth gear are gear trains in which engine braking is originally generated, but their sizes are relatively small.

As shown in FIG. 3, a throttle valve 56 operated by an accelerator pedal 50 and a throttle actuator 54 is provided in an intake pipe 48 of the engine 10 of the vehicle. The engine rotational speed sensor 58 for detecting the rotational speed N _E of the engine 10, the intake air quantity sensor 60 for detecting an intake air quantity Q of the engine 10,
Intake air temperature sensor 6 for detecting the temperature T _A of intake air
2, a throttle sensor 64 for detecting the opening degree θ _TH of the throttle valve 56, a vehicle speed sensor 66 for detecting the rotational speed N _OUT of the output shaft 42, that is, a vehicle speed V, and a cooling water temperature sensor for detecting a cooling water temperature T _W of the engine 10. 68, brake switch 70 for detecting the operation of the brake, shift lever 7
2, the operation position sensor 74 for detecting the operation position P _SH , the rotation speed N _IN of the input shaft 20, that is, the rotation speed N _{C0 of the} clutch _C0 (= the turbine rotation speed _NT or the input shaft rotation speed N
_IN ), the input shaft rotation sensor 73 for detecting the
And an oil temperature sensor 75 for detecting the hydraulic oil temperature T _OIL of the engine 4, the engine speed N _E , the intake air amount Q, the intake air temperature T _A , the opening degree θ of the throttle valve 56. _TH , vehicle speed V, engine coolant temperature T _W , brake operation state BK, shift lever 72 operating position P
A signal indicating _SH , the input shaft rotation speed N _C0 , and the hydraulic oil temperature T _OIL is supplied to the engine electronic control device 76 or the shift electronic control device 78.

As shown in FIG. 4, the shift lever 72 is operated to the P range position, the R range position, the N range position, the D and 4 range positions, the 3 range position, and the 2 range position which are located in the front-rear direction of the vehicle. The support mechanism is configured to be operated in the left and right directions of the vehicle from the D range position to the four range positions to the left and to the manual shift mode position, that is, the DM mode position to the right. When the shift lever 72 is operated to the DM mode position, the mode is switched from the previously selected automatic transmission mode to the manual transmission mode. The shift lever 72 also functions as a mode selection operating device.

As shown in FIG. 5, a pair of a downshift switch _79RD and an upshift switch _79RU are provided at the right side of the steering wheel 77 of the vehicle. Is provided with a pair of down shift switches 79 _LD and up shift switches 79 _LU . Those two pairs of switches 79 _RD and 79 _RU , 79 _LD and 79
_{The LU} functions as a manual switching operation device that is manually operated to preferentially execute the shift of the automatic transmission 14 when the manual shift mode is selected, and outputs the operation output to the shift electronic control device. 78. The shift electronic control device 78 causes the display to display the shift mode selected by operating the shift lever 72 among the automatic shift mode and the manual shift mode.

The engine electronic control unit 76 shown in FIG.
A so-called microcomputer having a PU, a RAM, a ROM, and an input / output interface.
The input signal is processed in accordance with a program stored in the ROM in advance while utilizing the temporary storage function of, and various engine controls are executed. For example, the fuel injection valve 80 is controlled for controlling the fuel injection amount, the igniter 82 is controlled for controlling the ignition timing, the bypass valve (not shown) is controlled for controlling the idle speed, and the traction control or the cruise control is controlled. For this purpose, the throttle valve 56 is controlled by the throttle actuator 54.

The shift electronic control unit 78 is also a microcomputer similar to that described above. The CPU processes input signals in accordance with a program stored in the ROM in advance while utilizing the temporary storage function of the RAM. Of each solenoid valve or linear solenoid valve. For example,
The shift electronic control unit 78 is provided with the lock-up clutch 24.
Command value DS for controlling the amount of engagement, release, and slip
LU is supplied to the linear solenoid valve SLU and its command value D
The control pressure P _SLU corresponding to the _SLU is output. When the automatic shift mode is selected, the shift electronic control device 78 changes the speed based on the actual throttle valve opening θ _TH and the vehicle speed V from a shift diagram stored in advance, for example, as shown in FIG. A determination is made and a shift output is performed so as to obtain the determined gear position, that is, a shift, and the solenoid valve S
By driving 1, S2 and S3, the automatic transmission 14
Automatically switch gears. Also, the shift electronic control device 78 operates when the shift lever 72 is in the manual shift mode (D
M) When the manual shift mode is selected by operating to the position, the upshift switches 79 _RU and 7
9 _LU , the gears of the automatic transmission 14 are switched one by one in response to the operation of the downshift switches 79 _R and 79 _LD . The shift electronic control unit 78 is communicably connected to the engine electronic control unit 76.
A signal necessary for one is transmitted from the other as appropriate.

FIG. 6 shows the control by the electronic control unit 78 for shifting.
FIG. 3 is a functional block diagram illustrating a main part of a control function. In the figure
The automatic transmission control means 90 selects the automatic transmission mode.
If it is selected, for example, the pre-stored data shown in FIG.
The running state of the vehicle, for example, the actual engine
Gin load (throttle valve opening θ_TH, Accelerator operation amount, fuel
Fuel injection amount, intake air amount, etc.) and vehicle speed V.
Make a speed decision and make changes to achieve the determined shift.
Speed output and automatically shifts the gear stage of the automatic transmission 14.
Replace it. The manual shift control means 92 sets the manual shift mode
When selected, functions as a manual switching device
Upshift switch 79_LU, 79 _RU, Downshift
Switch 79_LD, 79_RDAutomatic transmission in response to the operation of
14 is shifted each time.

The shift mode determining means 94 allows the automatic shift control means 90 to automatically determine the shift of the automatic transmission 14 and output the shift based on the actual vehicle speed and the engine load from the shift diagram of FIG. 7, for example. In response to the operation of each of the shift switches 79 _RD , 79 _RU , 79 _LD , and 79 _LU functioning as a manual switching operation device, and causing the manual transmission control means 92 to shift the automatic transmission 14 each time. It is determined which of the manual shift modes is selected in response to the mode switching operation by the shift lever 72. That is, when the shift lever 72 is operated to the DM mode position, the shift mode determining means 94 determines that the shift mode is the manual shift mode, and the shift lever 72 is operated to the travel range (R, D, 4, 3, 2). In this case, the automatic shift mode is determined.

When the manual shift mode is determined by the shift mode determining means 94, the manual shift control means 92 basically shifts the shift switch at least in a gear higher than the second gear. 79 _RD , 7
In response to the operation of 9 _RU , 79 _LD , and 79 _LU , the gear of the automatic transmission 14 is shifted up or down by the number of operations.

The engine brake control means 96 is operated when the shift lever 72 is operated to the engine brake range (4, 3, 2) for obtaining engine brake, or when the shift mode determining means 94 selects the manual shift mode. If it is determined that the automatic transmission 14 is in operation, the friction engagement device indicated by the black circle in FIG. , Ie, the second speed gear and the third speed gear are operated by the engine brake.

The lowest speed gear drive determining means 98, a manual automatic transmission 14 in the shift mode first gear (lowest gear speed) is used running state, for example, the shift switch 79 in the manual shift mode _RD, 79 _RU , 79 _LD ,
When the first gear is selected by the operation of the 79 _LU , the driving state is switched from the automatic shift mode to the manual shift mode when the gear is the first gear, or the vehicle stops in the manual shift mode. It is determined whether or not the vehicle is in the traveling state in which the first gear is selected. The driving traveling state determination means 100 determines whether or not the vehicle is in a driving traveling state at present or after shifting to the first gear. The manual shift control means 92 determines the driving state in which the first speed gear is used in the automatic transmission 14 by the lowest speed gear determining means 98 and the driving state of the vehicle by the driving state determining means 100. That is, when the accelerator pedal is depressed, the driving force is
When the traveling state (power-on traveling) transmitted from 0 to the drive wheels is determined, the shift to the first gear is executed.

Post-shift driving / running state prediction / judgment means 102
_Are the shift switches 79 _RD and 7 in the manual shift mode.
When the first gear is instructed in accordance with the operation of 9 _RU , 79 _LD , and 79 _LU , the vehicle after the first gear is achieved is in a non-driving state, that is, the engine 1
It is determined whether or not it is predicted that the vehicle will be in a power-off running state in which power is transmitted toward zero. The manual shift control means 92 includes a post-shift drive traveling state prediction determination means 102.
If it is predicted that the vehicle will be in a non-drive running state after the first gear is achieved, the first gear is prohibited and the second gear higher than the first gear is changed to the second gear. Is selected, and the automatic transmission 14 is switched to the second speed. Further, the manual shift control means 92 determines that the post-shift drive running state prediction determination means 102 does not predict that the vehicle after the first gear has been attained is in the non-drive running state, that is, that the drive running is predicted. In this case, the first speed is selected and the automatic transmission 14 is switched to the first speed.

The lowest speed gear traveling determination means 104 determines whether or not the vehicle is traveling at the first gear in the manual shift mode. The deceleration running determination means 106 determines whether or not the vehicle is running at a reduced speed, that is, a run in which the accelerator pedal operation amount is set to zero by the driver's intention to decelerate. This deceleration traveling is substantially the same as the non-driving traveling,
Vehicle driving (power on) traveling and non-driving (power off)
Since the travel is alternatively determined, the deceleration travel determination means 106 is substantially the same as the drive travel determination means. The manual shift control means 92 determines that the vehicle is traveling at the first gear by the lowest gear speed traveling determination means 104, and determines whether the vehicle is traveling at a reduced speed by the deceleration traveling determination means 106. If it is determined that there is, the first gear is prohibited, the second gear higher than the first gear is selected, and the automatic transmission 14 is switched to the second gear.

Further, manual shift mode vehicle stop determining means 1
08 determines that the vehicle has stopped in the manual shift mode. When the manual shift mode vehicle stop determining means 108 determines that the vehicle has stopped in the manual shift mode, the manual shift control means 92 selects the first speed and sets the automatic transmission 14 to the first speed. Switch to a higher gear.

Mode switching decision means 110 for lowest gear position
Determines whether the automatic transmission 14 has been switched from the automatic transmission mode to the manual transmission mode while the vehicle in which the automatic transmission 14 is in the first gear is running. Manual shift control means 92
Means that the automatic transmission 14 has been switched from the automatic transmission mode to the manual transmission mode during traveling of the vehicle in the first gear position, And the deceleration running determination means 10
If it is determined in step 6 that the vehicle is running at a reduced speed, the first gear is prohibited and a second gear higher than the first gear is selected. The manual transmission control means 92 is configured to control the first gear position when the vehicle is not decelerating when the automatic transmission mode is switched to the manual transmission mode during traveling of the vehicle in the first gear position. To switch the automatic transmission 14 to its first gear.

Lock-up clutch engagement increasing means 112
When the first gear is forbidden by the manual transmission control means 92, the lock-up clutch 24 provided in the torque converter (fluid transmission) 12 between the engine 10 and the automatic transmission 14 Enlarge the engagement area or increase the engagement force. This engagement area is, for example, as shown in FIG.
The right side of the engagement line shown in, the expansion of the engagement area,
For example, the engagement line shown by the solid line in FIG. 8 is shifted to the low vehicle speed side (left side) to the position shown by the broken line. The increase in the engagement force means to increase the pressure difference between both sides of the lock-up clutch 24 to increase the pressing force.

FIGS. 9, 10, 11 and 12 are flowcharts for explaining the main part of the control operation by the electronic shift control unit 78, that is, the manual shift control. FIG. 9 is a routine for applying an engine brake to a predetermined gear when in the engine brake mode, and FIG.
When the manual shift mode is selected and the shift switch 79 _RD ,
This is a manual shift control routine 1 for prohibiting the first gear based on the non-driving state of the vehicle when the first gear is selected according to the operation of 79 _RU , 79 _LD and 79 _LU .
FIG. 11 shows a manual shift control for inhibiting the first gear based on the non-driving state of the vehicle when the vehicle is operated from the D range to the manual shift mode (DM) position while traveling in the first gear. Routine 2. FIG. 12 shows a manual shift control routine 3 for inhibiting the first shift speed based on the non-driving state of the vehicle when the vehicle is traveling at the first shift speed in the manual shift mode. Only one of the routines shown in FIGS. 10, 11, and 12 may be executed alone, or two or more routines may be executed in parallel.

In the routine of FIG. 9 corresponding to the engine brake control means 96, in step (hereinafter, step is omitted) SA1, it is determined whether or not the shift lever 72 is operated to the engine brake (4, 3, 2) range. Or the shift lever 72 is in the manual shift mode (DM)
It is determined whether or not the engine brake mode is selected based on whether or not the operation has been performed to the position. This SA
If the determination of No. 1 is denied, the present routine is terminated, but if the determination is affirmed, the automatic transmission 1
It is determined whether the fourth gear is the second gear.
If the determination in SA2 is denied, SA4 is executed. If the determination is affirmed, in SA3, after the clutch C0 is engaged by activating the engine brake solenoid valve (not shown), SA4 is executed. Be executed. By the engagement of the clutch C0, the engine brake is operated in the second speed.

At SA4, it is determined whether the gear position of the automatic transmission 14 is the third speed. This SA4
If this determination is denied, this routine is ended. If affirmed, this routine is executed after the brake B1 is engaged by activating an unillustrated engine brake solenoid valve in SA5. Will be terminated. By the engagement of the brake B1, the engine brake is operated at the third speed.

In the manual shift control routine 1 shown in FIG. 10, in SB1, input signal processing such as reading of an input signal is executed. Next, at SB2 corresponding to the shift mode determining means 94, it is determined whether the manual shift (DM) mode is selected. If the determination at SB2 is denied, this routine is terminated. If the determination is affirmed, a downshift is performed at SB3 corresponding to the lowest gear speed traveling determining means 98 or the lowest gear speed traveling determining means 104. It is determined according to the operation of switch 79 _RD or 79 _LD whether or not the first gear is selected. If the determination at SB3 is negative, that is, if the gears other than the first gear are the shift switches 79 _RD , 79 _RU ,
If the selection command is issued according to the operation of 79 _LD and 79 _LU ,
At SB4, the shift switches 79 _RD , 79 _RU ,
A shift to a gear corresponding to the operation of 79 _LD , 79 _LU is executed each time.

However, if the determination at SB3 is affirmative, that is, if the downshift switch 79 _RD or 79 _LD
When the first gear is selected according to the operation of
At SB5 corresponding to the driving state determination unit 100 or the driving state determination unit 102 after shifting, it is determined whether the vehicle is in the driving state, that is, the power-on state, if the first gear is achieved. , Actual vehicle speed V
And the throttle valve opening _θTH . If the determination at SB5 is affirmative, a shift to the first gear is performed at SB6. However, that SB5
Is negative, that is, if it is estimated that the vehicle is in the non-drive traveling state (coast traveling state) after the shift to the first gear, the shift to the first gear is prohibited in SB7, and A shift to the second gear is performed. However, if the downshift switch 79 _RD or 79 _LD is operated twice in the third gear, for example, the shift up to the second gear is executed. In this embodiment, the above S
B4, SB6 and SB7 correspond to the manual shift control means 9
2 is supported.

Next, at SB8 and SB9 corresponding to the lock-up clutch engagement increasing means 112,
The engagement area of the lock-up clutch 24 is enlarged by moving the engagement line as shown by the broken line in FIG. 8, and the differential pressure of the lock-up clutch 24 is increased by a predetermined value, so that the pressing force, i. The resultant force is increased by a predetermined value.

In the manual shift control routine 2 shown in FIG. 11, in SC1, input signal processing such as reading of an input signal is executed. Next, in SC2, the shift lever 7
It is determined whether or not 2 has been operated from the D range position to the manual shift mode (DM) position. If the determination at SC2 is denied, this routine is ended. If the determination is affirmed, at SC3, it is determined whether or not the first gear is in the D range until then. In this embodiment, the SC2 and SC3 determine whether the automatic transmission 14 has been switched from the automatic transmission mode to the manual transmission mode while the vehicle is in the first transmission speed. It corresponds to the medium mode switching determining means 110 or the lowest gear speed traveling determining means 98.

If the determination at SC3 is negative, the routine is terminated. If the determination is affirmative, the driving traveling state determination means 100 or the deceleration traveling determination means 10 is performed.
In SC4 corresponding to 6, it is determined whether or not the vehicle is decelerating, that is, coasting in which the accelerator pedal operation amount is set to zero by the driver's intention to decelerate. This S
If the determination at C4 is negative, that is, if the vehicle is in the driving and running state, the first gear is maintained at SC5.

However, if the determination in SC4 is affirmative, that is, if the vehicle is running at a reduced speed, the shift to the first gear is prohibited and the shift to the second gear is executed in SC6. Is done. In this embodiment, SC5 and SC6 correspond to the manual shift control means 92. Next, the lock-up clutch engagement increasing means 1
In SC7 and SC8 corresponding to No. 12, the engagement area of the lock-up clutch 24 is expanded by moving the engagement line as indicated by the broken line in FIG. The pressing force, that is, the engaging force is increased by a predetermined value.

In the manual shift control routine 3 shown in FIG. 12, an input signal process such as reading an input signal is executed in SD1. Next, in SD2 corresponding to the shift mode determining means 94, it is determined whether the manual shift (DM) mode is selected. If the determination in SD2 is denied, this routine is terminated. If the determination is affirmative, the vehicle speed V is determined in SD3 corresponding to the lowest speed gear traveling determination means 98 or the manual shift mode vehicle stop determination means 108. Is determined to be equal to or less than a preset stop determination value α. The stop determination value α is a value for determining the stop state of the vehicle, and is set to, for example, about 2 to 3 km / h.

When the determination at SD3 is affirmative, that is, when the vehicle is stopped in the manual shift mode, the shift to the first gear is executed at SD4. However, if the determination at SD3 is negative, that is, when the vehicle is not stopped in the manual shift mode, in SD5, first gear is selected command according to the operation of the downshift switch 79 _RD or 79 _LD Is determined. If the determination in SD5 is denied, in SD6 the shift switch 79 _RD ,
A shift to a gear corresponding to the operation of 79 _RU , 79 _LD , 79 _LU is executed each time.

However, if the determination at SD5 is affirmative, that is, if the downshift switch 79 _RD or 79 _LD
When the first gear is selected according to the operation of
In SD7 corresponding to the driving traveling state determination means 100 or the deceleration traveling determination means 106, it is determined whether or not the vehicle is traveling in deceleration. If the determination in SD7 is negative, that is, if the vehicle is driving, the SD
At 4, the shift to the first gear is performed. However, if the determination in SD7 is affirmative, that is, if the vehicle is in the decelerating running state, in SD7, shifting to the first gear is prohibited and shifting to the second gear is executed. . In the present embodiment, SD4, SD6 and SD8 correspond to the manual shift control means 92.

Next, in SD9 and SD10 corresponding to the lock-up clutch engagement increasing means 112, the engagement area of the lock-up clutch 24 is enlarged by moving the engagement line as shown by the broken line in FIG. At the same time, the differential pressure of the lock-up clutch 24 is increased by a predetermined value, and the pressing force, that is, the engaging force is increased by a predetermined value.

As described above, according to the present embodiment, the engine brake control means 96 changes the gears other than the first gear which is the lowest gear of the automatic transmission 14 in the manual shift mode. Since the engine brake is applied, even if the first gear is selected in accordance with the operation of the downshift switch (manual switching operation device) 79 _RD or 79 _{LD in} the manual shift mode, the first gear is selected. Since the strong engine brake does not act on the vehicle, driving in the first gear is facilitated.

The control device according to the present embodiment determines whether or not the automatic transmission 14 is in a traveling state in which the first gear is used in the manual transmission mode. , SC2, SC3, SD3), the driving state determining means 100 (SB5, SC4, SD7) for determining whether or not the vehicle is in the driving state, and the lowest gear speed traveling determining means 98 for the automatic transmission 14. When the vehicle is determined to be in the traveling state in which the first gear is used and the driving traveling state determining means 100 determines the driving traveling state of the vehicle, the shift to the first gear is permitted and executed. Manual shift control means 92 (SB4, SB6, S
B7, SC5, SC6, SD4, SD6, SD8) and a, since it is intended to include, when it is driven running state of the first gear, first gear by the operation of the downshift switch 79 _RD or 79 _LD Since the shift to the first gear is permitted, the vehicle can be driven with a large driving force by the first speed gear only during driving while the engine brake is not applied.

The control device according to the present embodiment operates in the manual shift mode by using the downshift switch 79 _RD or 79 _LD.
When the first gear is instructed in accordance with the operation described above, it is determined whether or not the vehicle after the first gear has been achieved is predicted to be in the non-driving state. If it is predicted by the prediction determining means 102 (SB5) and the post-gearing drive traveling state prediction / determination means 102 that the vehicle after the first gear has been achieved will be in the non-drive traveling state, the first gear And a manual transmission control means 92 (SB7) for prohibiting the transmission and selecting the second higher gear.
Therefore, when it is predicted that the vehicle after the first gear is achieved will be in the non-driving state,
Since the first gear is prohibited and the second gear, which is higher than the first gear, is selected, there is an advantage that the vehicle can travel with an appropriate engine braking action in the non-drive traveling state.

In this embodiment, the manual transmission control means 92 (SB6) determines that the vehicle is in the non-driving state after the first gear is achieved by the post-gearing driving state estimation / determination means 102. If it is not predicted, that is, if driving is expected, the first speed is selected and the automatic transmission 14 is switched to the first speed, so that when driving without engine braking, the first speed is selected. The vehicle can run with a large driving force due to the gear.

The control device according to the present embodiment determines whether or not the vehicle is traveling at the lowest gear position in the manual shift mode in the first gear position.
5), the vehicle is traveling in the first gear by the deceleration traveling determining means 106 (SD7) for determining whether the vehicle is traveling in reduced speed, and the traveling-in-lowest-speed gear determining means 104. When the vehicle is decelerated and the vehicle is decelerated by the deceleration traveling determination means 106, the first speed is prohibited and the second speed is selected. SD8), the manual transmission control means 92 prohibits the first gear and selects the second gear higher than the first gear when the vehicle is running at a reduced speed. There is an advantage that the vehicle can travel with an appropriate engine braking action in a deceleration traveling state in which the pedal operation amount is zero.

The control device further includes a manual shift mode vehicle stop determining means 108 (SD3) for determining that the vehicle has stopped in the manual shift mode, and the manual shift control means 92 (SD4) When the manual shift mode vehicle stop determining means 108 determines that the vehicle has stopped in the manual shift mode,
Since the first speed is selected and the automatic transmission 14 is switched to the first speed, the vehicle can be driven with a large driving force due to the first speed when the vehicle starts running when the vehicle restarts. it can.

The control device according to the present embodiment determines whether the automatic transmission 14 has been switched from the automatic transmission mode to the manual transmission mode while the vehicle is in the first gear. Medium speed gear mode switching determination means 110
(SC2, SC3), the deceleration running determination means 106 (SC4) for determining whether or not the vehicle is running in deceleration, and the mode switching determination means 110 for the lowest gear stage, the automatic transmission 14 is shifted to the first speed gear. When it is determined that the automatic shift mode has been switched to the manual shift mode during the traveling of the gear set as the gear and the deceleration traveling determination means 106 determines that the vehicle is traveling in the first gear, And a manual transmission control means 92 (SC6) for prohibiting the transmission and selecting a higher second gear position. Therefore, the manual transmission is changed from the automatic transmission mode to the manual transmission mode while the vehicle is traveling in the first gear position. If the mode is switched to the mode and it is determined that the vehicle is running at a reduced speed, the first speed is prohibited by the manual transmission control means 92 and the second speed higher than that is selected. Le manipulated variable can advantageously be run in a suitable engine braking effect in the deceleration driving state is zero.

In the above-mentioned control device, the manual shift control means 92 (SC5) controls the vehicle when the automatic shift mode is switched to the manual shift mode while the vehicle in the first gear stage is traveling. When the vehicle is not decelerating, the first gear is selected and the automatic transmission is switched to the first gear, so that a large driving force is generated by the first gear when the vehicle is running without the engine brake. The vehicle can be run with.

In this embodiment, the manual shift control means 9
2 (SB7, SC6, SD8), when the first gear is prohibited, the engagement area or engagement area of the lock-up clutch 24 provided in the torque converter 12 between the engine 10 and the automatic transmission 14. Lock-up clutch engagement increasing means 112 (SB8, SB9, S
C7, SC8, SD9, SD10) are further provided. Therefore, the engagement area or the engagement force of the lock-up clutch 24 when the first gear is prohibited is increased, and the effect of the engine braking action is further enhanced. Not as large,
An appropriate magnitude of engine braking action is obtained, which is greater than in the case of the second speed gear higher than the first speed.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, the engine brake control means 96 of the above-described embodiment generates the engine brake in the second gear and the third gear when the engine is in the engine brake mode. Gear stage and fifth
As for the second gear and the third gear,
When the power transmission path from the driving wheels to the engine 10 is configured to be interrupted by a one-way clutch or the like, that is, when the engine brake is not applied, the fourth and fifth gear speeds are set. An engine brake may be generated in the engine brake mode.

In the above-described embodiment, when the first gear is prohibited, the manual shift control means 92 (SB7,
(SC6, SD8), the shift to the second gear is executed, but another gear such as the third gear may be used. In short, it is sufficient that the gear is higher than the first gear.

The down shift switches 79 _RD and 79 _LD and the up shift switches 79 _Ru and 79 of the above-described embodiment are used.
_{The LU} was provided on the steering wheel 77,
It may be provided near the driver's seat, such as a steering column or a dashboard.

In the above embodiment, the downshift switches 79 _RD , 79 _LD ,
Although the upshift switches 79 _Ru and 79 _LU have been used, other types such as an operation lever for manual shifting may be used. The cruise control setting lever already provided on the steering column may also be used as a manual shift operation lever in the manual shift mode.

In the above embodiment, the shift lever 7
2 is operated to the DM mode position to switch from the automatic transmission mode to the manual transmission mode. However, when the mode selection operation button or the operation lever provided independently is operated, the manual transmission mode is operated. The transmission mode may be configured to be selected.

In the above-described embodiment, the gear train configuration and the number of shift stages of the automatic transmission 14 are not directly related to the present invention, and may be of various types.

In the above-described embodiment, the shift lever 7
The manual shift mode is selected by the operation 2 and the gear position specified by the manual shift operation by the shift lever 72 is selected and fixed. The present invention can also be applied to a variable speed variable type in which the shift range of 2 is electrically changeable using an operating body or a switch provided separately from the shift lever 72. In this case, when the lowest speed range, for example, the L range is set according to the operation of the operating body or the switch, the manual speed change control means 92 automatically switches to the upper two ranges, or In the minimum speed range, the gear is automatically switched from the lowest gear to the second gear.

Although not specifically exemplified, the present invention can be embodied with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a skeleton diagram illustrating a configuration of an automatic transmission for a vehicle in which a gear position is controlled by a shift control device according to an embodiment of the present invention.

FIG. 2 is a table showing a relationship between a combination of operations of a plurality of frictional engagement devices and a gear established by the combination in the automatic transmission of FIG. 1;

FIG. 3 is a block diagram including a hydraulic control circuit and an electric control circuit for controlling the automatic transmission of FIG. 1;

FIG. 4 is a diagram illustrating an operation position of a shift lever of FIG. 3;

5 is a diagram showing an example of an arrangement of each shift switch of FIG. 3 on a steering wheel.

6 is a functional block diagram for explaining a main part of a control function of the electronic control unit for shifting shown in FIG. 3;

FIG. 7 is a diagram showing an example of a shift diagram used in the automatic shift control means of FIG. 6;

FIG. 8 is a diagram showing an example of a lock-up clutch engagement diagram which is changed to expand the engagement area by the lock-up clutch engagement increasing means in FIG. 6;

9 is a flowchart illustrating a main part of a control operation of the shift electronic control device of FIG. 3, and is a diagram illustrating an engine brake control routine.

FIG. 10 is a flowchart illustrating a main part of a control operation of the shift electronic control device of FIG. 3, and is a diagram illustrating a manual shift control routine 1; You.

11 is a flowchart illustrating a main part of a control operation of the shift electronic control device of FIG. 3, and is a diagram illustrating a manual shift control routine 2. FIG. You.

12 is a flowchart illustrating a main part of a control operation of the shift electronic control device of FIG. 3, and is a diagram illustrating a manual shift control routine 3. FIG.

[Explanation of symbols]

14: Automatic transmission 92: Manual gear shift control means 96: Engine brake control means 98: Lowest gear speed drive determination means 100: Driving state determination means 102: Post-shift drive travel state prediction and determination means 104: Lowest speed gear speed travel medium judging means 106: deceleration determining means 108: manual shift mode vehicle stop determining means 110: slowest gear Danchu mode switching determining means 112: lock-up clutch engagement increasing means 79 _RU, 79 _LU: upshift switch (manual changeover Operating device) 79 _RD , 79 _LD : Downshift switch (manual switching operating device)

Claims (5)

[Claims] 1. A control device for an automatic transmission for a vehicle configured to deactivate an engine brake in a lowest gear, wherein the automatic transmission is in a running state in which a lowest gear is used. The lowest speed gear drive determining means for determining whether or not the vehicle is in a drive running state at present or after shifting to the lowest gear; When the traveling state of the vehicle is determined by the gear traveling determining means in the driving state in which the lowest speed is used for the automatic transmission, and the driving traveling state of the vehicle is determined by the driving traveling state determining means, A control device for an automatic transmission for a vehicle, comprising: a manual shift control means for allowing a shift. 2. A control device for an automatic transmission for a vehicle, wherein an engine brake of a lowest gear is deactivated, wherein when the lowest gear is commanded by a manual operation, A post-shift drive running state prediction determining means for determining whether or not the vehicle after the lowest gear position is attained is in a non-drive running state; Manual shift control means for inhibiting the lowest gear and selecting a higher gear than the lowest gear when the vehicle is predicted to be in a non-driving state after the gear is achieved. A control device for an automatic transmission for a vehicle, comprising: 3. A control device for an automatic transmission for a vehicle, wherein an engine brake of a lowest gear is deactivated, wherein the vehicle stops in a state where a manual operation related to a shift is performed. Manually operated vehicle stop determining means for determining whether the vehicle is stopped, and manual shift control means for selecting the lowest gear when the manually operated vehicle stop determining means determines that the vehicle is stopped. A control device for an automatic transmission for a vehicle, comprising: 4. A traveling means for determining whether or not the vehicle is traveling at a lowest gear, which determines whether the vehicle is traveling at a lowest gear by manual operation, and a deceleration traveling determination for determining whether or not the vehicle is traveling at a reduced speed. Means, when the vehicle is traveling at the lowest gear speed by the lowest gear speed traveling determination means, and when the vehicle is determined to be decelerating traveling by the deceleration traveling determining means, And a manual transmission control means for prohibiting a high gear and selecting a higher gear than the lowest gear. 5. A lowest gear middle mode switching determination for determining whether or not the automatic transmission has been switched from the engine brake non-operating mode to the engine brake operating mode while the vehicle is traveling in the lowest gear. Means, a deceleration traveling determination means for determining whether or not the vehicle is traveling at a reduced speed, and a mode switching determination means during the lowest gear position, wherein the automatic transmission is in the lowest gear position during traveling of the vehicle. When it is determined that the mode has been switched from the engine brake non-operation mode to the engine brake operation mode, and the deceleration traveling of the vehicle is determined by the deceleration traveling determination means,
And a manual transmission control means for prohibiting the lowest gear and selecting a higher gear than the lowest gear.