JPH04129931U - Emergency clutch switching device for automatic transmission - Google Patents

Abstract

(57) [Summary] [Purpose] This invention is attached to an automatic transmission, and is intended for emergency use of an automatic transmission that allows the driver to easily connect and disconnect the clutch during emergency driving by operating the clutch pedal. An object of the present invention is to provide a clutch switching device. [Structure] Here, a clutch valve 32 is installed, which is attached to an automatic transmission device that drives a clutch actuator 2 and a gear shift unit 4 to control automatic transmission of a vehicle, and which operates to adjust pressure according to the amount of depression of a clutch pedal 33. Since the emergency working fluid supply circuit 30 is connected in parallel to the working fluid supply circuit 16, the switching operability of the clutch can be improved, and the operation reliability in emergency driving can be improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an emergency clutch switching device attached to an automatic transmission of a vehicle, and in particular, to a vehicle automatic transmission. The clutch actuator is normally supplied and discharged with working fluid from the working fluid supply circuit. Regarding the emergency clutch switching device that can engage and disengage the clutch using a motor. do.

0002

[Conventional technology]

As shown in FIG. 4, in a conventional mechanical automatic transmission, a piston-type clutch actuator 2 engages and disengages a clutch 1, and shifts a gear train in a transmission 3 to an arbitrary gear position. The automatic transmission control unit 6 controls the rotational speed Ne of the engine 5, the stroke position Sc1 of the clutch 1 in the approaching/disengaging direction, and the gear position of the transmission 3 through these actuators. Here, a working fluid supply circuit 16 is connected to the clutch actuator 2, and working fluid from air tanks 17 and 18 of the circuit is supplied to and discharged from the clutch actuator 2 according to the opening degree of a solenoid valve (not shown). Note that reference numeral 7 indicates an injection pump that controls the fuel injection amount of the engine 5, and an electronic governor 8 of the pump 7 is controlled by a governor control unit 9. Furthermore, the automatic shift control unit 6 includes a change lever 10 that outputs a driver's shift mode designation signal Sc, etc., a load sensor 12 that outputs an opening signal θ of an accelerator pedal 11, and a clutch that outputs clutch rotation speed Ncl information. Rotation sensors 13, a gear position sensor 14 that outputs a gear position signal S _M of the transmission, and a vehicle speed sensor 15 that outputs vehicle speed V information are connected, and signals are exchanged with the governor control unit 9. ing.

0003 However, if an abnormality occurs in the control unit 6 of this type of device, the vehicle Even moving both to the evacuation site becomes difficult. To deal with this, the vehicle Emergency switch 2 that allows forward and backward movement at specific gears for emergencies 4 connected to an automatic transmission control unit 6 has been proposed.

0004 This emergency switch 24 is connected to the clutch actuator 2 and the gear shifter. For the opening/closing circuit of each solenoid valve connecting the foot unit 4 and the automatic transmission controller, These are connected in parallel, and each solenoid valve can be operated at any time by switching the switch. It can be driven sequentially.

[0005] By the way, the operation panel of the emergency switch 24 is configured as shown in FIG. It is. Here, the base plate 19 includes a rotary switch 20 and a toggle switch 2. 1 is arranged. Then, the rotary switch 20 is set to 2nd speed and It enables shifting to reverse gear, and here LED 22 or 23 is set at 1 position. Turn on the light, pull out the gear in the 2nd position, and select 2nd or reverse gear in the 3rd position. complete the shift in 4th position, and then move the clutch just before half-clutching in 5th position. Hold. Then, by turning on the toggle switch 21, the clutch is engaged. By operating the clutch in the direction and disengaging it, the clutch is operated in the disengaged direction and the vehicle moves forward or backward. I'm letting you do it.

[0006] However, by merging the clutch actuator and gear shift unit control circuits, Even if there are two electrical systems using an electrical switch, all of these two electrical systems can be connected. It is possible that something goes wrong. To deal with this, an air tank was developed as shown in Figure 4. parallel to the working fluid supply circuit 16 connecting the clutch actuators 17 and 18 and the clutch actuator 2. An emergency working fluid supply circuit 25 is further connected to the 2-way valve of the circuit. By switching and operating the clutch disengagement valve 26, the clutch can be directly released in an emergency. You may also perform contact/separation operations.

[0007]

[Problem that the idea aims to solve]

In this way, conventional mechanical automatic transmissions are equipped with an emergency switch. An emergency working fluid supply circuit 25 with a clutch disconnection valve 26 is provided to provide emergency response. was being treated. However, the clutch disengagement valve 26 here is a two-way valve and is a single valve. The clutch can only be held in two positions, disengaged and engaged, and the clutch transmission torque cannot be adjusted. There was a problem with switching operability. Moreover, since it is manual, there is a delay in operation in case of an emergency. This is also a problem in terms of operability. The purpose of this invention is to enable easy switching and disengagement of the clutch during emergency driving. An object of the present invention is to provide an emergency clutch switching device for an automatic transmission that can be used.

[0008]

[Means to solve the problem]

In order to achieve the above object, the present invention provides that the working fluid from the working fluid supply circuit is The clutch actuator, which is supplied and discharged, operates the clutch to engage and disengage, and shifts the gear. The gear train of the transmission is changed according to the shift operation of the foot unit, and the gear train is changed according to the vehicle driving information. Then, the clutch actuator and gear shift unit are driven to perform automatic gear shift control. It is attached to the automatic transmission device that controls the transmission, and is connected in parallel to the above working fluid supply circuit. An emergency working fluid supply circuit is provided, and a clutch pedal is installed in the emergency working fluid supply circuit. The pressure is adjusted so that the supply pressure of the working fluid increases according to the amount of depression of the barrel. It is characterized by the fact that it is equipped with a clutch valve.

[0009]

[Effect]

The clutch valve installed in the emergency working fluid supply circuit is activated when the clutch pedal is depressed. The pressure is adjusted to increase the supply pressure of the working fluid according to the amount of oil, so automatic gear shifting is possible. Even if the device does not drive the clutch actuator to perform automatic gear shift control, the clutch The clutch can be moved in and out by pressing the clutch pedal, allowing emergency driving in a predetermined gear. Become so.

0010

【Example】

The emergency clutch switching device of the automatic transmission shown in Figure 1 is the same as that shown in Figure 4. A new emergency working fluid supply circuit 30 and an additional Same except for the manual switch 31 and emergency switch 24' that were added. Because the book contains many similar parts, duplicate parts are given the same numbers and duplicate explanations are omitted. .

[0011] Here, the automatic transmission receives signals such as accelerator opening θ1, vehicle speed V, engine rotational speed Ne, and rack position S _L into the governor control unit 9, and controls the engine 5 according to a predetermined fuel supply processing program. The automatic transmission control unit 6 controls the accelerator opening θ, vehicle speed V, engine rotation speed Ne, rack position S _L , gear stage S _M , clutch stroke Scl, clutch rotation speed Ncl, and transmission switch 10 It takes in signals such as gear shift mode from the vehicle and controls the start, departure, and gear changes of the vehicle. In addition, in an emergency, the clutch 1 is engaged and released by the emergency working fluid supply circuit 30, and the emergency gear is selected by manual switch operation by the emergency switch 24' or the additional manual switch 31, and the vehicle is activated in an emergency. It is configured so that it can be run. Here, an emergency working fluid supply circuit 30 is connected in parallel to the working fluid supply circuit 16 connecting the air tanks 17 and 18 and the clutch actuator 2, and a manual switch 31 is connected to the automatic shift control unit 6.

0012 The emergency working fluid supply circuit 30 is a clutch pedal that operates according to the driver's pedal force. A clutch valve 32 whose opening degree is controlled by a clutch valve 33 is provided. this clutch valve 32, the valve opening degree is varied by the pedal opening degree θc, and the valve opening degree is varied according to the increase in the opening degree. The air pressure supplied to the switch actuator 2 side is increased according to the characteristics shown in Fig. 3. It is configured to Here, the air pressure increases as the pedal opening degree θc increases. Therefore, the clutch stroke Scl is continuously switched from the engaged position to the disengaged position. It becomes. The gear train in the transmission 3 of this vehicle has 5 forward speeds and 1 reverse speed as shown in Figure 2. It is possible to achieve a gear position according to the shift pattern.

[0013] The automatic gear change control unit 6 controls the accelerator opening θ and the engine speed Ne. In addition, each speed change mode of automatic speed change command and manual speed change command from the speed change switch 10 Based on signals such as Automatically selects the optimal gear based on gear data and performs automatic gear shifting for starting, starting, and shifting control and control the vehicle so that it runs under the correct conditions. Furthermore, the emergency switch 24' is used to switch between 2nd gear and 2nd gear, which are emergency gears. and reverse gear train switching output in parallel with the output of the automatic transmission control unit 6. The structure is simplified, with no clutch engagement/disengagement operation. There is. In addition, a manual switch connected to the automatic transmission control unit 6 When 31 is turned on manually, it sets the gear shift unit 4 to an emergency gear position. It is configured to directly output the switching output for all second gears.

[0014] This kind of emergency clutch switching device of automatic transmission is automatic transmission control. Used when unit 6 is abnormal. In this case, first, the driver presses the clutch pedal 1. 1 and hold clutch 1 in the disengaged position. Then, turn on the emergency switch. 24' to change the gear shift output to the emergency gear (2nd gear or reverse gear). Output to shift unit 4. Then, return the clutch pedal 11 to half-engage the clutch. The vehicle then takes off, engages clutch 1, and enters emergency driving in 2nd gear. this After that, turn the emergency switch 24' and clutch pedal 11 in the same way. You can also operate it in reverse to drive in a higher gear.

[0015] On the other hand, there is no problem if the speed change process is achieved quickly, but if the emergency The emergency gear shift (2nd gear or reverse gear) has been reached using the emergency gear switch 24'. If not, disengage clutch 1 again and turn on manual switch 31. and operate the gear shift unit 4 to shift to the emergency gear (2nd gear or reverse gear). It is also possible to shift gears and enter emergency driving, and from the beginning, manual switch 31 It is also possible to enter an emergency run.

[0016] In the above, the emergency switch 24' outputs only the gear position signal P _M , but the emergency switch 24, which can perform clutch engagement/disengagement processing as shown in FIGS. 4 and 5, can be automatically configured. It may also be connected to the speed change control unit 6. In this case, when an abnormality occurs in the automatic transmission control unit 6, the emergency switch 24 can be used to make the vehicle run in an emergency manner.Furthermore, when the emergency switch 24 also prevents the vehicle from running, the vehicle can be put into emergency drive according to the operation of the clutch pedal 11 and the manual switch 31. It is also possible to operate the vehicle to enter emergency driving in a gear position (second gear or reverse gear).

[0017]

[Effect of the idea]

As mentioned above, this idea allows the driver to press the clutch pedal in the event of an abnormality in the automatic transmission. The clutch can be connected and disconnected by operating the clutch valve that is linked to the , operate the emergency switch or manual switch to shift to emergency gear (2 It is possible to change gears by outputting the gear shift output to the gear shift unit (speed gear or reverse gear), Then, you can start smoothly by operating the clutch pedal, and then engage the clutch. This improves clutch switching operability and improves emergency driving operation. Improves production reliability.

[Brief explanation of drawings]

FIG. 1 is a schematic overall configuration diagram of an emergency clutch switching device for an automatic transmission as an embodiment of the present invention.

2 is a diagram of shift patterns that can be achieved by the transmission of the automatic transmission of FIG. 1; FIG.

FIG. 3 is an air pressure characteristic diagram used by the emergency clutch switching device of the automatic transmission shown in FIG. 1;

FIG. 4 is a schematic overall configuration diagram of a conventional emergency clutch switching device for an automatic transmission.

5 is a schematic front view of an emergency switch used in the automatic transmission of FIG. 4. FIG.

[Explanation of symbols]

1 clutch 2 Clutch actuator 3 Transmission 4 Gear shift unit 5 Engine 6 Automatic transmission control unit 9 Governor control unit 16 Working fluid supply circuit 24 Emergency switch 24’ emergency switch 30 Emergency working fluid supply circuit 31 Manual switch 32 Clutch valve 33 Clutch pedal

Claims (1)

[Scope of utility model registration request] Claim 1: A clutch actuator to which working fluid is supplied and discharged from a working fluid supply circuit operates a clutch to engage and release the clutch, switches a gear train of a transmission in accordance with a gear shift operation of a gear shift unit, and uses vehicle driving information. Accordingly, an emergency working fluid supply circuit is provided, which is attached to an automatic transmission device that drives the clutch actuator and gear shift unit to perform automatic speed change control, and is connected in parallel to the working fluid supply circuit. An emergency clutch switching device for an automatic transmission, characterized in that the supply circuit is equipped with a clutch valve that adjusts the pressure so that the supply pressure of the working fluid increases according to the amount of depression of the clutch pedal.