JP2587092Y2 - Control device for automatic transmission - Google Patents

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.

[0002]

2. Description of the Related Art As a conventional control device for an automatic transmission, there is the following one. That is, JP-A-47-
Japanese Patent No. 35558 discloses an automatic transmission for calculating a slip ratio of a drive wheel from a drive wheel rotation speed and a vehicle speed, and reducing a drive torque to the drive wheel when the slip ratio exceeds a predetermined value. Is shifted from a low-speed gear to a high-speed gear to prevent the wheels from slipping. Japanese Unexamined Patent Publication No. Sho 60-176828 discloses a method for detecting and comparing the rotational speed of each of a front wheel and a rear wheel, detecting the occurrence of slip based on the difference, and outputting a slip detection signal. In response to the signal, the adjusting device is operated to shift the shift position of the automatic transmission to the high gear position, thereby reducing the driving force transmitted to the tires and preventing slip. In addition, actual opening Hei 2-48437
What is indicated in the gazette that the brake is applied
Is detected, the brake is applied in response to this signal.
The deceleration of the vehicle during
To determine the shift down timing
Control, or sudden braking on snowy roads, etc.
To prevent the tire from locking and causing engine stalling.
To disengage the clutch instead of downshifting
Work and shift down according to how the brakes work
Change the running speed of the engine and effectively apply the engine brake
The deceleration is performed. Further, Japanese Patent Laid-Open No. 51-1
No. 02773 discloses an electronically controlled skid.
The prevention device detects that the wheels have started slipping and
Decrease the braking force of the rake and detect this with a detector.
The most important thing about the engine brake
Perform control to switch the automatic transmission to a difficult shifting pattern
It is an operation of the electronic control skid prevention device only.
The transmission will not be able to
Strong when set in a shift pattern with a rake
The engine brake is applied and the electronic control skid prevention device
The disadvantage is that the effect is weakened, but electronically controlled
Detection device and pattern switching device
Transmission pattern with the least amount of engine braking
To switch the automatic transmission to the
Can be prevented.

[0003]

However, the conventional automatic transmission control device has the following problems. That is, in Japanese Patent Application Laid-Open No. 47-55558, the gear position is shifted from the low-speed gear to the high-speed gear when the slip ratio exceeds a predetermined value. It has not been. For this reason, the shift from the low-speed gear to the high-speed gear is performed during the start, and there is a problem that a smooth start cannot be performed because a slip has occurred at this time. Similarly, Japanese Patent Application Laid-Open No. Sho 60-176828 discloses a problem that a smooth start cannot be performed because the shift position is shifted to the high-speed position after the slip of the drive wheels is detected. is there. Furthermore, the actual Kaihei 2
-48437 discloses that the vehicle stops or
Effective engine braking until the speed is reduced to the desired speed
Control of deceleration applied to the motor.
-102773 discloses that the vehicle stops or stops.
Controls the slip until it is reduced to the desired speed
Both of these are
Has no effect on preventing slip when restarting
There is a problem. The present invention is intended to solve such a problem.

[0004]

According to the present invention, a slip state at the time of vehicle stop or immediately before vehicle stop is stored,
The above-mentioned problem is solved by switching the shift mode or the gear position according to the stored slip state when the vehicle restarts . That is, the control device for an automatic transmission according to the present invention, as shown in FIG. 1 (a), detects whether a wheel is in a slip condition, a vehicle speed detecting device for detecting a vehicle speed, and whether a brake is applied. Braking detection means for detecting whether or not, a storage determination device to which signals from these detection means are input, and a shift mode switching device for switching the shift mode based on information from the storage determination device,
The memory judgment device applies the brake from the braking detection means.
And has a signal is input that is input vehicle speed signal zero from the vehicle speed detecting means, and, when the slip signal is input from the slip detecting means, the vehicle at the time of stopping the slip-like
State when stopping and restarting after stopping.
Slip control is required depending on the slip condition
When it is determined, the shift mode switching device sets the shift mode.
It is configured to output a signal for switching to a predetermined mode for preventing slip . Also, as shown in FIG. 1 (b), the control device for the automatic transmission according to the present invention has slip detection means for detecting the slip state of the wheels, vehicle speed detection means for detecting the vehicle speed, and whether the brake is applied. Brake detection means for detecting whether or not there is no change , a storage determination device to which signals from these detection means are inputted, and a shift selection device for switching a gear position based on information from the storage determination device. device, the brake is multiplied by the braking detection means
Signal is input that have been input speed signal zero from the vehicle speed detecting means, and, when the slip signal is input from the slip detecting means, the slip state when the vehicle stops
At the time of restart after stopping.
Determined that slip control is necessary depending on the slip condition
When the gear is disconnected, the gear shift
It is configured to output a signal for switching to a predetermined position to be prevented . In addition, the control device of the automatic transmission according to the present invention includes:
A slip detecting means for detecting a slip state of the wheel, a vehicle speed detecting means for detecting a vehicle speed, and a brake applied
Braking detection means for detecting whether or not the vehicle is engaged, a storage determining device to which signals from these detecting means are input, and a shift mode switching device for switching a shift mode based on information from the storage determining device. A signal indicating that the brake is applied is input from the brake detecting means, a vehicle speed signal equal to or less than a predetermined value indicating that the vehicle is just before stopping is input from the vehicle speed detecting means, If the predetermined time slip signal is inputted from the vehicle stops
Stores the slip state immediately before, during the re-start after a stop
The slip system according to the stored slip state.
When it is determined that
It is configured to output a signal for switching the shift mode to a predetermined mode for preventing slippage . Further, the control device of the automatic transmission according to the present invention includes a slip detection unit that detects a slip state of wheels, a vehicle speed detection unit that detects a vehicle speed, and a brake detection unit that detects whether a brake is applied . A storage determining device to which signals from these detecting means are inputted, and a shift selecting device for switching a gear position based on information from the storing determining device, wherein the memory determining device applies a brake from the braking detecting device. Said that
Signal is input, a vehicle speed signal of a predetermined value or less indicating that the vehicle is just before stopping is input from the vehicle speed detecting means, and a slip signal is input for a predetermined time from the slip detecting means . Remember the slip state
When the vehicle restarts after a stop, the slip
When it is determined that slip control is necessary according to the situation
Is configured to output a signal for switching a gear position to a predetermined position for preventing slippage to a gear change selecting device .

[0005]

[Action] storing a slip condition of the vehicle stopped or stopped just before the storage decision unit, when re-starting after the stop, the storage
Slip control is required depending on the slip condition
When it is determined that there is
Switch the mode to the specified mode to prevent the occurrence of slip
The gear position is shifted by the
The gear is switched to a predetermined gear position for preventing generation. This allows
When the vehicle restarts after stopping, the vehicle is
Because the position has been switched to a state suitable for the road surface condition,
Slip can be prevented from the beginning.

[0006]

FIG. 2 shows a first embodiment of the present invention. Wheel sensors 10, 12, 14, and 16 for front, rear, left, and right wheels, respectively.
Is provided, and rotation of each wheel is detected. The rotation of the wheel detected by each of the wheel sensors 10, 12, 14, and 16 is input to a slip detection device 18 to detect a slip state. The slip detecting device 18 is configured to determine that a slip has occurred when any of the wheel speeds deviates from the average value of the wheel speeds of the four wheels by a predetermined amount or more. The signal from the slip detecting device 18 is stored in the storage judging device 2
Input to 0. The storage determination device 20 includes a vehicle speed sensor 22
A vehicle speed signal from the (vehicle speed detecting means) and a signal from a brake detecting device 26 (braking detecting means) for detecting ON / OFF of the brake switch 24 are also input. The vehicle speed sensor 2
Reference numeral 2 is configured to detect rotation of the output shaft of the automatic transmission. The storage determination device 20 stores these input signals, determines a shift mode based on these signals, and outputs this signal to the shift mode switching device 28. The shift mode switching device 28 switches the shift mode based on the input shift mode signal. The shift mode includes, for example, a power mode, a normal mode, and a snow mode. In the power mode, the shift line of the automatic transmission is set to a higher vehicle speed side than in the normal mode. The snow mode is a mode in which the vehicle starts from the second speed.
Note that the vehicle speed sensors 10, 12, 14, and 16 and the slip detecting device 18 constitute a slip detecting unit.

FIG. 3 shows a control flow of the storage judging device 20 of the first embodiment. First, it is determined whether the brake switch 24 is on (step 102). If it is off, the process ends; if it is on, it is determined from the vehicle speed signal from the vehicle speed sensor 22 whether the vehicle is stopped (whether the output shaft of the automatic transmission is rotating) (104). If the vehicle is not stopped, the process ends. If the vehicle is stopped, it is determined whether a slip has occurred based on a signal from the slip detection device 18 (106). If the slip has not occurred, the process ends. If the slip has occurred, the shift mode is switched to the snow mode by the shift mode switching device 28 (108). As a result, if a wheel slip occurs while the vehicle is stopped (that is, if the vehicle is stopped on a slippery road surface),
The snow mode is selected, and the start from the second speed is performed. In this way, the vehicle can be started at the second speed from the beginning when restarting after stopping, so that a smooth start operation can be performed.

FIG. 4 shows a second embodiment. This means that the memory determination device 20 outputs the gear position signal,
Same as the first embodiment except that a shift selecting device 30 is provided in place of the shift mode switching device 28 of the first embodiment, and that the shift selecting device 30 switches the gear position based on an input signal. It is.

FIG. 5 shows a control flow of the storage judging device 20 of the second embodiment. First, it is determined whether the brake switch 24 is on (step 110). If the vehicle is off, the process ends. If the vehicle is on, it is determined whether or not the vehicle is stopped based on the vehicle speed signal from the vehicle speed sensor 22 (11).
2). If the vehicle is not stopped, the process ends. If the vehicle is stopped, it is determined whether or not a slip is occurring based on a signal from the slip detection device 18 (see FIG. 11).
4). When the slip has not occurred, the process is terminated. When the slip has occurred, the gear position is switched to the second speed by the shift selecting device 30 (id 116). Thereby, the same operation as that of the first embodiment can be obtained.

FIG. 6 shows a control flow of the third embodiment. The device is the same as in the first embodiment. First, it is determined whether the brake switch 24 is on (step 120). If the switch is off, the process ends. If the switch is on, the slip detection device 1 is turned off.
It is determined from the signal from 8 whether a slip has occurred (122). If the slip has not occurred, the process ends. If the slip has occurred, it is determined from the vehicle speed signal from the vehicle speed sensor 22 whether or not the vehicle speed is equal to or less than a predetermined value (12).
4). If the value is equal to or greater than the predetermined value, the process ends. If the value is equal to or less than the predetermined value, it is determined whether a slip has occurred for a predetermined time (No. 126). If the predetermined time has not occurred, the process ends. If the predetermined time has occurred, the shift mode is switched to the snow mode by the shift mode switching device 28 (the same as in the first embodiment).
28). This makes it possible to detect the slip state immediately before the vehicle stops and control the shift mode at the time of restart after the stop .

FIG. 7 shows a control flow of the fourth embodiment. The device is the same as in the second embodiment. First, it is determined whether the brake switch 24 is on (step 130). If the switch is off, the process ends. If the switch is on, the slip detection device 1 is turned off.
It is determined from the signal from 8 whether a slip has occurred (132). If the slip has not occurred, the process ends. If the slip has occurred, it is determined from the vehicle speed signal from the vehicle speed sensor 22 whether the vehicle speed is equal to or lower than a predetermined value (13).
4). If the value is equal to or more than the predetermined value, the process ends. If the value is equal to or less than the predetermined value, it is determined whether a slip has occurred for a predetermined time (136). If the predetermined time has not occurred, the process ends. If the predetermined time has occurred, the gear position is switched to the second speed by the shift selecting device 30 (138). In this case, the same operation as described above can be obtained.

[0012]

According to the present invention, according to the invention], and stores the slip condition of the vehicle stopped or stopped just before the storage decision unit, after stopping
When the vehicle restarts, according to the slip condition stored above
If it is determined that slip control is necessary,
Switch to a gear change mode or gear position to prevent the this
The vehicle is already in shift mode when restarting after stopping.
Or, the gear position is switched to a state suitable for the road surface condition.
Gear mode or gear suitable for road conditions from the beginning
It is possible to restart smoothly without slipping at the position
Wear.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between components of the present invention.

FIG. 2 is a diagram showing a first embodiment of the present invention.

FIG. 3 is a control flow of the first embodiment.

FIG. 4 is a diagram showing a second embodiment.

FIG. 5 is a control flow of the second embodiment.

FIG. 6 is a control flow of the third embodiment.

FIG. 7 is a control flow of the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 12, 14, 16 Wheel sensor 18 Slip detecting device 20 Memory judgment device 22 Vehicle speed sensor (vehicle speed detecting device) 24 Brake switch 26 Brake detecting device (braking detecting device) 28 Shift mode switching device 30 Shift selecting device

Claims (4)

(57) [Scope of request for utility model registration] 1. A slip detecting means for detecting a slip state of a wheel, a vehicle speed detecting means for detecting a vehicle speed, and a brake
Brake detection means for detecting whether or not is applied, a storage determination device to which a signal from these detection means is input, a shift mode switching device for switching a shift mode based on information from the storage determination device, And the memory determination device determines that the brake is applied from the braking detection means .
When a signal is inputted, a vehicle speed signal of zero is inputted from the vehicle speed detecting means, and a slip signal is inputted from the slip detecting means , the slip state at the time of stopping the vehicle is stored.
Every time the vehicle restarts after a stop
When it is determined that slip control is necessary according to the state
To prevent the transmission mode switching device from slipping the transmission mode.
A control device for an automatic transmission configured to output a signal for switching to a predetermined mode for stopping . 2. A slip detecting means for detecting a slip state of a wheel, a vehicle speed detecting means for detecting a vehicle speed, and a brake.
Braking detection means for detecting whether or not is applied, a storage determination device to which signals from these detection means are input, and a shift selection device for switching a gear position based on information from the storage determination device, When the signal indicating that the brake is applied is input from the braking detection means, the zero vehicle speed signal is input from the vehicle speed detection means, and the slip signal is input from the slip detection means, , Memorize the slip state when the vehicle stops, and stop
According to the slip condition stored at the time of later restart
When it is determined that slip control is necessary,
A control device for an automatic transmission configured to output a signal for switching a gear position to a predetermined position for preventing slippage to a selection device . 3. A slip detecting means for detecting a slip state of a wheel, a vehicle speed detecting means for detecting a vehicle speed, and a brake.
Brake detection means for detecting whether or not is applied, a storage determination device to which a signal from these detection means is input, a shift mode switching device for switching a shift mode based on information from the storage determination device, And the memory determination device determines that the brake is applied from the braking detection means .
A signal is input, and a vehicle speed signal of a predetermined value or less indicating that the vehicle is just before stopping is input from the vehicle speed detecting means, and
When a slip signal is input for a predetermined time from the slip detection means, the slip state immediately before the vehicle stops is stored.
When the vehicle restarts after a stop, the slip
When it is determined that slip control is necessary according to the situation
Prevents the gear shift mode switching device from slipping the gear shift mode
A control device for an automatic transmission configured to output a signal for switching to a predetermined mode. 4. A slip detecting means for detecting a slip state of a wheel, a vehicle speed detecting means for detecting a vehicle speed, and a brake.
Braking detection means for detecting whether or not is applied, a storage determination device to which signals from these detection means are input, and a shift selection device for switching a gear position based on information from the storage determination device, The memory determination device receives a signal indicating that the brake is applied from the brake detection means, receives a vehicle speed signal of a predetermined value or less indicating that the vehicle is just before stopping from the vehicle speed detection means, and When a slip signal is input for a predetermined time from the detection means,
The slip state when the vehicle stops is stored, and the
At the time of start, slip according to the slip condition
When it is determined that the shift control is necessary,
A control device for an automatic transmission configured to output a signal for switching a gear position to a predetermined position for preventing slippage .