JPS6280332A - Emergency control device for vehicle automatic speed change gear - Google Patents

Abstract

PURPOSE:To enable a vehicle to run safety or in an minimum required condition upon emergency in which the control of running the vehicle becomes impossible due to failure of an electronic control device, an actuator or the like. CONSTITUTION:In addition to an electronic control device 5, there is provided an emergency control device 6 for controlling emergency solenoid valves Ve0, Ve1, Ve2, Ve3 for operating a select actuator 1 and a shift actuator 3. An emergency control switch 7 is the one by which the driver instructs a gear shift or release to limited gear stages (first speed gear stage, neutral position, backward stage). When a change-over switch 8 is changed over, the switch 8 deenergizes the electronic control device 5 but energizes the emergency control device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an emergency control device for an automatic transmission for a vehicle.
In particular, the present invention relates to an emergency control system for an automatic transmission for a vehicle, which enables limited selection and limited shifting to allow the vehicle to run even when the electronic control device is out of order.

(Prior Art) Recently, an increasing number of vehicles are controlled by electronic control devices consisting of microcomputers. In this type of vehicle, an electronic control device controls the rotational speed of the internal combustion engine, gear switching control of the transmission, clutch control, and various accessory controls. In order to control a vehicle by an electronic control device, the electronic control device calculates the next control amount of the various actuators controlled by signals from various sensors installed in the various actuators that drive the controlled device, and then
Control signals are issued to these devices to control the operations of the controlled devices.

(Problems with the Prior Art) By the way, in conventional vehicles controlled by electronic control units, the microcontroller that makes up the electronic control unit is used as a backup measure in the event that various sensors fail and the vehicle suddenly stops. A computer-based software backup process was used to enable safe vehicle operation or minimal vehicle movement.

However, in the event that the electronic control unit itself is physically damaged, the microcomputer that constitutes it goes out of control, or a malfunction that cannot be resolved with the software backup described above occurs, the vehicle cannot be operated. This could lead to serious accidents on expressways.

(Objective of the Invention) The present invention is intended to improve the above-mentioned conventional drawbacks, and its purpose is to prevent vehicle running control in a vehicle controlled by an electronic control device due to a failure related to the electronic control device and actuator. To provide an emergency control device for an automatic transmission for a vehicle, which allows the vehicle to travel safely or at least to run the vehicle in a minimum amount of time in the event of an emergency in which the automatic transmission is disabled.

(Summary of the Invention) An emergency control device for an automatic transmission for a vehicle is provided, which has an emergency means for moving a speed actuator to a predetermined emergency position, and allows the vehicle to run in a limited manner by the emergency means when an electronic control device fails. be done.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a vehicle transmission actuator, and FIG. 2 is a flowchart of its emergency control.

In the figure, 1 is a select actuator, which has a 4-position mechanical stop structure with a 3-position cylinder + 1-position cylinder structure, and 2 is a select position switch N l
*This is the shaft of the select actuator for N2, N5, and N4 operation. Vl+”2*
V5 is a normal electromagnetic valve that operates the select actuator l. The select position of the select actuator during normal operation, the operating state of the solenoid valve during normal operation, and the ON state of the select position switch are as shown in the table below.

Normal selection control Here, O indicates an on state.

3 is a shift actuator consisting of a 3-position cylinder, and 4 is a shift stroke switch SL+sO+52
e is the shaft of the shift actuator that operates the
v4 + v5 are electromagnetic valves that operate the shift actuator 3 during normal operation. The shift position of the shift actuator during normal operation, the operating state of the electromagnetic valve during normal operation, and the ON state of the shift position switch are shown in the table below.

Normal shift control Here, O indicates an on state.

5 is a main control gear consisting of an electronic control device, which in normal conditions operates to shift to the optimum gear by inputting the select lever signal operated by the driver, the vehicle speed signal, etc. Select the shift position using position switches fN1 + N2, N5 + N4, and shift position switch s,
, so, and s2. The electromagnetic valve that is operated during normal operation is the normal electromagnetic valve ■], v2. V3
．． There are five types: v4 and v5.

Reference numeral 6 denotes an emergency control device, which operates emergency electromagnetic valves Veo, VeI, VS2, and VS3, details of which will be described later. 7 is an emergency operation switch, which is used by the driver to specify a shift to a limited gear (l speed, neutral, reverse) and a gear release.

8 is a changeover switch, and when switched, the main control device 5
This is for cutting off the power to the emergency control switch 6 and supplying power to the emergency control switch 6.

The emergency electromagnetic valve veo is turned on by a command from the emergency control device 6, cuts off the oil supply from the pump to the normal hydraulic circuit 9 shown by the solid line, and closes the emergency hydraulic circuit l shown by the dotted line.
Oil is supplied to O from the pump. Furthermore, when the emergency control device 6 is activated, the emergency electromagnetic valves Vel, V
S2 and VS2 are also made operable. The emergency electromagnetic valve ■el works in the same way as the normal electromagnetic valve ■2, and when turned on, it moves the select actuator 1 to l-speed.
Select to R position.

In addition, the emergency solenoid valve Ve2. Ve5 works in the same way as the solenoid valves v4 and v5 during normal operation, and when VS2 is on, 1
Speed position, VS2. VS2 is on and neutral, VS2
is on and shifts the shift actuator to the reverse position.

Next, emergency RiJ control will be explained with reference to the flowchart in FIG.

Now, for example, when driving in 5th gear (select position switch N3 is on, shift position switch S1
is on), and if the electrical system of the valve drive system of the solenoid valve 4 is cut off during normal operation of the shift actuator 3 (damage to the transistor, failure of the normal solenoid valve V4, disconnection of electric wires, etc.), the gear shifts to 5th gear. It becomes impossible to return to neutral.

In addition, when the select actuator l is in normal operation, the solenoid valve v
If the electrical system for driving the valve No. 2 is cut off, it will no longer be possible to select from the 4th to 5th speed positions.

In such a case, the present invention performs emergency control as shown in the flowchart below.

Step 1: The changeover switch 8 is switched from the main control device 5 to the emergency control device 6 by the driver.

Step 2: If the emergency control device 6 does not operate, the main control device 5
Step 3: The emergency electromagnetic valve veo is turned on, and the hydraulic pressure from the pump P is switched from the normal hydraulic circuit to the emergency hydraulic circuit.

Step 4 = The position specified by the driver with the emergency operation switch is read.

Step 5: It is determined whether the designated position is reverse, neutral, or l speed.

Step 6: If it is determined in step 5 that the vehicle is moving backwards, the emergency electromagnetic valve Ve2. Ve5 is turned on and a shift is performed.

Step 7: After tlPj, turn on the emergency electromagnetic valve Ve1 and select the ■speed-reverse position.

Step 8: After t2 seconds, turn on the emergency electromagnetic valve Ve2 and shift to the reverse position.

Step 9 If it is determined to be neutral in step 5, the emergency solenoid valve Ve2. Veg is turned on and a shift is performed.

The operations when l speed is selected (steps 10 to 12) are the same as those for reverse (the only difference is the operation of the emergency solenoid valve Ve5 in step 12).
Details are omitted.

(Effects of the Invention) As explained in detail above, the present invention enables even if the electronic control device of the vehicle malfunctions or runs out of control, or any of the electrical systems in the transmission control device malfunctions, the power supply to the electronic control device is first turned off. After stopping the supply, the electronic control device is turned off and the emergency means moves the shift actuator to a predetermined emergency position, and the select actuator is moved to the predetermined emergency position. By making it possible to shift the vehicle, it is now possible to drive the vehicle safely at low speeds, or to take emergency measures such as moving the vehicle to the shoulder of the road.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an actuator for a vehicle transmission, and FIG. 2 is a flowchart of its emergency control. DESCRIPTION OF SYMBOLS 1... Select actuator, 3... Shift actuator, 5... Electronic control device, 6... Emergency control device, 7... Emergency operation switch, 8... Changeover switch, vl + v2 * vi5 + v41 V
5...Normal solenoid valve, Veo, Vel, V
e2, VeIs-1 emergency solenoid valve.

Claims (2)

[Claims] (1) The electronic control device has a means for stopping the electronic control device, and an emergency means for moving the speed change actuator to a predetermined emergency position while the electronic control device is in a rest state, and when the electronic control device malfunctions, the emergency means is activated. An emergency control device for an automatic transmission for a vehicle, which is characterized by causing the vehicle to run in a limited manner. (2) The emergency control device for an automatic transmission for a vehicle according to claim (1), wherein the speed change actuator includes a shift actuator and a select actuator.