JP3157656B2 - Automatic transmission for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, instead of interposing a torque converter between an engine and a planetary gear transmission as an automatic transmission for a vehicle, a conventional transmission and a mechanical clutch have been used to detect various operating states of these transmissions. 2. Description of the Related Art There has been known an apparatus in which sensors and an actuator for driving the sensors are provided, and when a shift request is generated, a control unit storing a microcomputer controls the drive of the actuator based on these detection signals to perform automatic shifting. Of these, a large reduction ratio type auxiliary transmission (range gear) that switches the output side of the main transmission between high and low and an input side that is switched between high and low in order to realize a fine multi-stage transmission with a small number of main gears as a transmission There is an example in which a small reduction ratio type auxiliary transmission (split gear) is added (actually open gears 4-586).
No. 65).

[0003]

By the way, in such a conventional example, the combination of the main gear and the range gear is changed as required by the control unit, and the gear position determined by these combinations is further changed to high / low by the split gear. Switching is performed, but if a failure state in which the split gear cannot be switched occurs,
Despite the fact that the gears required for normal driving can be secured with the combination of the range gear and the main gear, a series of control processes will not be completed unless the split gear is switched, causing the vehicle to be stuck in a state where shifting is impossible was there.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem by taking a backup measure for a failure state in which a split gear cannot be switched.

[0005]

According to a first aspect of the present invention, there is provided a transmission having an auxiliary transmission for increasing the number of shift speeds of a main transmission, a multi-stage mode with switching of an auxiliary transmission, and without switching of an auxiliary transmission. a mode switch for selecting the low-stage mode artificially, and means for controlling the gear position of the main and sub transmission so as to operate the transmission to the target gear position according to the selected mode of the mode switch in the event of a shift request, the Means for determining an unswitchable failure state of an auxiliary transmission in a vehicle equipped with the automatic transmission and ignoring a mode switch at the time of the failure determination and automatically selecting a low gear mode without switching an auxiliary transmission. Means are provided. According to a second aspect of the present invention, there is provided a small reduction ratio type auxiliary transmission for switching the input side of the main transmission between high and low, and a large reduction ratio type auxiliary transmission for switching the output side of the main transmission between high and low. A transmission, a mode switch for artificially selecting a multi-stage mode with switching of the input-side sub-transmission and a small-stage mode without switching of the input-side sub-transmission,
Automatic vehicle and means for controlling the gear position of the main and sub transmission so as to operate the transmission to the target gear position according to the selected mode of the mode switch in the event of a shift request
In the transmission, means for determining switching non fault condition on the input side auxiliary transmission automatically selects the low stage mode without switching the input side auxiliary transmission ignore the mode switch at the failure determination and means, Ru provided.

[0006]

According to the first aspect of the invention, the mode switch is artificially set.
If you select the multi-stage mode by operating
For control characteristics of large gear ratios without switching gearboxes
Is set, and if the multi-stage mode is selected,
The control characteristic is set to a small interstage control characteristic with switching.
As a result, the transmission responds to shifting requests.
Therefore, when the small-stage mode is selected, the control characteristics of the large
Gear shift to target gear based on multi-stage mode selection
The gear shift to the target gear is based on the control characteristics of the small gear ratio.
Shift is executed. Unchangeable failure of auxiliary transmission
When a condition occurs, it is related to the mode switch selection mode.
And the multi-stage mode is automatically selected.
The transmission has a large gear ratio control characteristic when a shift request is issued.
The gear shift to the target shift speed based on the characteristics is performed. I
Therefore, an unswitchable failure condition of the subtransmission occurs.
However, the change required for traveling by switching control of the main transmission
It is possible to keep the running state of the vehicle while securing the speed
It will work. In the second invention, the mode switch is
If you select small-stage mode by operating
Control of large gear ratio without switching input side auxiliary transmission
When the multi-stage mode is selected, the
Control characteristics of small gear ratio with switching of power-side auxiliary transmission
Is set to Therefore, the transmission
When a small-stage mode is selected, a large stage
The gear shift to the target gear based on the
When selecting the step mode, select an
A gear shift to a standard gear is performed. Input side auxiliary transmission
If an unswitchable fault condition occurs, the mode switch
Mode is automatically selected regardless of the switch selection mode
The transmission is
Gearshift to target gear based on control characteristics of large gear ratio
Is executed. Therefore, turning off the input side auxiliary transmission
Main transmission and power output even if an irreplaceable fault condition occurs
The change required for normal driving is controlled by the switching control of the side auxiliary transmission.
It is possible to keep the running state of the vehicle while securing the speed
It will work .

[0007]

FIG. 1 is a block diagram of an entire apparatus showing an example of application to a diesel engine vehicle. A fuel injection pump 1 drives a control lever in accordance with an accelerator opening, and
A throttle actuator 2 for controlling the engine rotation to match the required rotation, a clutch actuator 4 (air booster) for engaging and disengaging the clutch for the mechanical clutch 3, and a gear shift for driving the gear shift mechanism of the main gear for the transmission 5. In addition to the actuator 6, a split actuator 7 and a range actuator 8 for switching a split gear and a range gear before and after the main gear to HL (high / low), respectively, are provided.

In this case, the transmission 5 has main gears Zm1 to Zm3-Zc3 to Zc1, Zc as shown in FIG.
Split gears Zm4-Zc4, Zm5-Z with small gear ratios to mR-ZcR-ZmR1 (3rd forward and backward, 1st reverse)
c5 (high, low) and a range gear Zr having a large gear ratio
1-Zcr1, Zr2-Zcr2 (high, low) are arranged, and the main gears Zm1 to Zm3 to Zc3 to Zm1 to Zm3 to Zm4 when split gears Zm4 and Zm5 are not switched for shifting.
Zc1 and range gears Zr1-Zcr1, Zr2-Zcr
The combination of 2 and 6 forward gears, split gear Zm4
When the switching of Zm5 is added, the gear can be shifted to 12 forward steps.

[0009] As means for detecting the operating state required for the shift control of the vehicle, an accelerator sensor 10 for detecting a pedal depression angle (accelerator opening) corresponding to the engine load is provided for the accelerator pedal 9, and a flywheel is provided for the clutch 3. An engine rotation sensor 11 for detecting the rotation speed of the engine and a clutch stroke sensor 12 for detecting the stroke position of the clutch 3 detect an initial position and an operating position of the clutch pedal 13 (manually operating the clutch booster 4). The transmission 5 includes a position sensor 16 for detecting an actual shift position, and a main shaft rotation sensor 17 (which functions as a vehicle speed sensor) for detecting a rotation speed of a propeller shaft connected to the main shaft. Can be

In order to engage the main gears Zm1 to Zm3, ZmR, which idle on the main shaft of the transmission 5, with the main shaft in the synchro region, a counter shaft rotation sensor 18 for detecting the rotation speed of the counter shaft is provided. In the operator's cab, in addition to the shift lever device 19 (shifter) of the transmission 5, the split gear Zm
6th forward mode without switching between 4 and Zm5 and forward 12 with switching between split gears Zm4 and Zm5
A mode switch 19a for selecting a gear mode and a monitor 20 for displaying a shift position of the transmission 5, an on-off state of the mode switch (selection mode), and the like are provided. The shifter 19 is simplified to an h-shaped operation pattern having five positions of upshift, downshift, hold, reverse, and neutral.

The engine control unit 21 and the transmission control unit 22 control the driving of the actuators 2 and 6 to 8 based on these output signals. When an engine shift request corresponding to the lever position of the shifter 19 is generated, The gear shift of the transmission 5 to the required position of the shifter 19 is performed while controlling the engine rotation speed to the required rotation as necessary. In response to a shift-up request and a shift-down request, as shown in FIG. 3, the mode display lamp of the monitor 20 is turned off when the mode switch 19a is off, and the forward six-speed mode without switching the split gears Zm4 and Zm5 is performed. The shift of the transmission 5 is controlled in the forward 12-speed mode in which the mode display lamp is turned on when the mode switch 19a is turned on and the split gears Zm4 and Zm5 are switched (1.01 to 1.06). When a failure state in which the split gears Zm4 and Zm5 cannot be switched is determined, the shift operation of the forward six-speed mode is performed ignoring the on / off state of the mode switch 19a, and the mode indicator lamp of the monitor 20 flashes brightly to cause the split gear to flash. Displays the system failure status (1.01 → 1.07 →
1.04).

With this configuration, if the shift up operation of the shifter 19 is performed while the transmission 5 is running, for example, at 4H (the main gear is in the second speed, the range gear is H, and the split gear is H), the mode switch 19a is turned off. Jumps to 5H (main gear is 3rd gear, range gear is H, split gear is H) and mode switch 19a
Is ON, the gear is shifted by one stage to 5L (the main gear is in third speed, the range gear is in H, and the split gear is in L).

For some reason, the split gear Zm4.Z
Even if an unswitchable failure state of m5 occurs, the backup function in the transmission control unit 22 operates to perform the shift control in the forward six-speed mode. For example, when the mode switch 19a is on and the transmission 5 is at 4H, When a failure state of the split gear system occurs, the main gear is shifted to the third speed in response to the shift-up operation of the shifter 19, thereby performing a step jump shift to 5H. Therefore, the shift change of the main gears Zm1 to Zm3 and the range gear Zr1 are performed. The traveling state of the vehicle can be continued while the shift required for normal traveling is secured by switching Zr2, that is, a problem that the vehicle is stuck due to inability to shift can be avoided.

The occurrence of a failure in the split gear system is monitored by the monitor 20.
Since the driver is warned by the mode display lamp, the discomfort caused by shifting to the stepped shift without depending on the manual operation can be immediately eliminated.

[0015]

According to the first aspect of the invention, there is provided a transmission having an auxiliary transmission for increasing the number of gear stages of the main transmission, a multi-stage mode with switching of the auxiliary transmission, and a small gear without switching of the auxiliary transmission. A mode switch for artificially selecting a mode, and means for controlling a gear position of the main and sub-transmissions to operate the transmission to a target shift speed according to the mode selected by the mode switch when a shift request is issued.
Means for determining an unswitchable failure state of an auxiliary transmission in a vehicle equipped with the automatic transmission and ignoring a mode switch at the time of the failure determination and automatically selecting a low gear mode without switching an auxiliary transmission. Means is provided, even if an unswitchable failure state of the auxiliary transmission occurs,
While maintaining the gearshift required for traveling by switching control of the main transmission based on the automatically set low gear mode,
The running state of the vehicle can be continued. According to the second invention, a small reduction ratio type auxiliary transmission for switching the input side of the main transmission between high and low and a large reduction ratio type auxiliary transmission for switching the output side of the main transmission between high and low are provided. , A mode switch for artificially selecting a multi-stage mode with switching of the input-side sub-transmission and a low-gear mode without switching of the input-side sub-transmission, and selection of a mode switch when a shift request occurs means for controlling the gear position of the main and sub transmission so as to operate the transmission to the target gear position in accordance with the mode, the automatic transmission of a vehicle including a
Oite, means for determining a switching non fault condition on the input side auxiliary transmission, automatically selecting a means of low-stage mode without switching the input side auxiliary transmission ignore the mode switch at the failure determination Therefore, even if a failure state in which the input-side sub-transmission cannot be switched occurs, the switching control of the main transmission and the output-side sub-transmission is normally performed based on the automatically set small-speed mode. It is possible to maintain the running state of the vehicle while securing the shift required for running.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic transmission.

FIG. 2 is a diagram illustrating a configuration of a transmission.

FIG. 3 is a flowchart illustrating control contents of a control unit.

FIG. 4 is a diagram corresponding to claims of the present invention.

[Explanation of symbols]

Reference Signs List 5 transmission 6 gear shift actuator 7 split actuator 8 range actuator 16 position sensor 17 main shaft rotation sensor (vehicle speed sensor) 18 counter shaft rotation sensor 19 shifter 19a mode switch 20 monitor 22 transmission control unit Zm1-Zm3-Zc3-Zc1, ZmR-ZcRー Z
mR1 Main gear Zm4-Zc4, Zm5-Zc5 Split gear Zr1-Zcr1, Zr2-Zcr2 Range gear

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (2)

(57) [Claims] A transmission including an auxiliary transmission for increasing the number of gears of a main transmission, and a multi-stage mode with switching of the auxiliary transmission and a small-gear mode without switching of the auxiliary transmission are artificially selected. An automatic transmission for a vehicle , comprising : a mode switch; and means for controlling a gear position of a main / sub transmission in order to operate a transmission to a target shift speed according to a mode selected by the mode switch when a shift request is issued.
And means for judging a failure state in which the sub-transmission cannot be switched, and means for automatically selecting a low gear mode without switching the sub-transmission by ignoring the mode switch at the time of this failure judgment. An automatic transmission for a vehicle, comprising: 2. A transmission having a small reduction ratio type auxiliary transmission for switching the input side of the main transmission between high and low and a large reduction ratio type auxiliary transmission for switching the output side of the main transmission between high and low. A mode switch for artificially selecting a multi-stage mode with switching of the input-side sub-transmission and a low-gear mode without switching of the input-side sub-transmission, and a mode switch selection mode when a shift request occurs. means for controlling the gear position of the main and sub transmission so as to operate the transmission to the target gear has, in an automatic transmission of a vehicle including a
Oite, means for determining a switching non fault condition on the input side auxiliary transmission, automatically selecting a means of low-stage mode without switching the input side auxiliary transmission ignore the mode switch at the failure determination And a vehicle automatic transmission.