JP2819642B2 - Automatic transmission clutch control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clutch control device for an automatic transmission using an electronic control device.

(Prior Art) In recent years, vehicles equipped with an automatic transmission that controls a parallel shaft gear type transmission and a friction clutch using an electronic control device including a microcomputer have been put to practical use.

In a vehicle equipped with this type of automatic transmission, if the electronic control unit body breaks down or breaks down, the vehicle operates according to the failure mode, and for example, a stopped vehicle may suddenly jump out.

For this reason, in addition to the main electronic control unit, a proposal for providing a backup electronic control unit for backup and performing disconnection control of the clutch according to the vehicle speed has been proposed by the present applicant in Japanese Patent Application Laid-Open No. 62-299440. It is shown as a clutch control device for an equipped vehicle.

FIG. 5 is a block diagram showing an outline of the proposed shown in publication described above, the clutch actuator 30 for operating the clutch on one side hydraulic type, hydraulic oil from the hydraulic source 1 through the electromagnetic valve V ₁ When pressure-fed, the clutch moves in the illustrated disengagement direction to disengage the clutch, and the movement in the contact direction is operated by the elastic force of the spring of the clutch. The hydraulic oil from the clutch actuator 30 is intended to be discharged to the tank 2 via the solenoid valve V _3, V _2.

A communication line 6 is connected between the main electronic control unit 4 and the emergency electronic control unit 5, and a signal from a vehicle speed sensor 7 is input to the emergency electronic control unit 5. When a fault occurs, the pulse signal generated by software is not generated or the waveform cycle is disturbed. When the emergency electronic control unit 5 detects such an abnormality via the communication line 6, the vehicle speed becomes a predetermined value. the following situations in which the clutch actuator 30 and the cross-sectional controlled by an electromagnetic valve V ₃ to prevent flying out of the vehicle.

Further, the clutch control system shown in FIG. 6 is used on both sides hydraulic type the clutch actuator 3, the number of solenoid valves also are those in which the V ₄ increases one, V ₁ open solenoid valve, V ₂ closed,
After disconnection of the clutch at V ₄ opened, the electromagnetic valve V ₂ opens, in V ₄ closed, is to hold the clutch disconnection.

(Problem to be Solved by the Invention) In the proposal disclosed in the former publication, when the main electronic control device 4 is abnormal, the emergency electronic control device 5 can be operated to prevent the vehicle from jumping out. However, if the main electronic control unit 4 is normal, but the electrical wiring of the solenoid valve that holds the clutch disconnection is abnormal, the clutch disconnection holding function will be lost, and the main electronic control unit 4 Since the communication contents are normal, the emergency electronic control unit 5 uses the solenoid valve V ₃
Cannot control the clutch disengagement, and the vehicle jumps out.

In the clutch control system using the latter on both sides hydraulic type clutch actuator, although the electromagnetic valve system of both the solenoid valves V ₂ and V ₄ shown in FIG. 6 is not a clutch contact unless failure simultaneously, usually In the routing of the vehicle, the power supply of the electronic control unit and the electric circuit of the solenoid valve are branched,
In addition, the connection to the solenoid valve is connected sequentially in any way,
For example, if any of the points between point A and point B is broken,
Both the solenoid valves V ₂ and V ₄ do not operate, so that the clutch is engaged, and the vehicle jumps out.

The present invention has been made in view of such a problem, and a purpose thereof is to provide a clutch control for an automatic transmission that prevents accidental jumping of a vehicle when a solenoid valve that holds the clutch is disconnected is abnormal. It is to provide a device.

(Means for Solving the Problems) According to the present invention, there is provided a clutch control device for an automatic transmission, comprising a main electronic control device and an emergency electronic control device for backing up the main electronic control device, and controlling a clutch by a solenoid valve. A normal hydraulic route for turning the clutch on and off by opening and closing an electromagnetic valve controlled by the main power supply device, an emergency hydraulic route for turning off the clutch by driving an emergency electromagnetic valve controlled by the emergency electronic control device, A failure detecting means for detecting a failure due to an energization failure of the clutch disconnection / holding solenoid valve on the normal hydraulic route; And a backup means for holding the clutch.

(Operation) The main electronic control unit stops communication output based on the abnormal signal from the detecting means for detecting the operation of the clutch disconnection holding solenoid valve of the main electronic control unit, so that the emergency electronic control unit detects the abnormality. Then, the emergency solenoid valve that holds the backup clutch disengagement is operated to prevent the vehicle from jumping out.

Example Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing an outline of a current detection circuit in a main electronic control unit in this embodiment. The same portions are denoted by the same reference numerals, and description thereof will be omitted.

L ₁ is a power supply line for supplying power to the main electronic control unit 4 and the solenoid valves V ₁ , V ₂ , V _{4. The} power supply of the main electronic control unit 4 and the three solenoid valves is at point A. It is branched and supplied.

Further, the three solenoid valves V _1, V _2, V ₄ to the wiring to command from the main electronic control unit 4 respectively are connected via a connector 8.

Then, a power supply line leading to the solenoid valve V ₂ and V _4, the line X and Y which are connected to the detection circuit to be described later is provided in the middle of the wiring instruction to.

These are the normal hydraulic routes used to control the clutch in normal operation.

L ₂ is an emergency power line, and the emergency electronic control unit 5
It is similarly connected to the sixth figure above the line for supplying power to the emergency solenoid valve V ₃ and.

A vehicle speed signal from the vehicle speed sensor 7 is input to the emergency electronic control unit 5. If the communication signal from the main electronic control unit 4 input via the communication line 6 is abnormal, the vehicle speed signal is output. There is configured to actuate the clutch actuator 3 to the cross-sectional direction by driving the emergency solenoid valve V ₃ when the predetermined value or less.

The hydraulic route for disconnecting and controlling the clutch in an emergency is an emergency hydraulic route.

Next, in FIG. 2, V is a coil of the solenoid valve to hold the clutch disconnection, or the electromagnetic valve V ₂ in Fig. 1 for example
A coil of V _4, shows that the circuit of the aforementioned X or Y is connected.

Tr is a transistor that opens and closes the current of the solenoid valve V. A command from the main electronic control unit is input to the base circuit, a current detection resistor R is connected to the emitter, and a coil of the solenoid valve V is connected to the collector. I have. When a command is input to the base, a current is supplied to the solenoid valve V to drive the solenoid valve V and the resistance R
A predetermined voltage drop occurs at both ends of the comparator, and the comparator C compares the voltage drop with a voltage of reference voltage × r ₂ / (r ₁ + r ₂ ) to detect whether or not the circuit operates normally. It constitutes failure detection means.

FIG. 3 is a processing flowchart showing the operation of the main electronic control unit,
FIG. 4 is a processing flowchart showing the operation of the emergency electronic control unit, and the operation of this embodiment will be described with reference to these processing flowcharts.

First, in order to hold the cross-sectional of the clutch, in the first view and held by the passage of hydraulic fluid from the clutch actuator 3 to the cross-sectional transmits an instruction to the solenoid valve V ₂ and V _4, the detection circuit of the resistor R The current value of the solenoid valve is detected from the voltage drop (steps 1 and 2).

Next, when the comparator C is determined to be normal in step 3, the process proceeds to step 4, and the main electronic control unit 4 continues to transmit a normal signal to the emergency electronic control unit 5. However, if the current value is abnormal in step 3, the operation proceeds to step 5 to stop the communication output, communicate the abnormality to the emergency electronic control unit 5, and inform the driver of the clutch disconnection by the main electronic control unit. That the control system is abnormal is notified using the warning means.

Meanwhile, the emergency read by the electronic control unit 5 signals Step 6 from the main electronic control unit 4, if the normal communication signal put read proceeds from step 7 to step 8, thereby operating the emergency solenoid valve V ₃ Without repeating the flow. However, when the communication output is stopped as in step 5 described above, the emergency electronic control unit 5 detects this, and when the vehicle speed signal from the vehicle speed sensor 7 is smaller than the predetermined vehicle speed, the process proceeds from step 9 to step 10. It operates the backup means for disconnection of the clutch transmits an instruction to the emergency solenoid valve V _3, will prevent the jumping of inadvertent vehicle.

As described above, the present invention has been described with the above-described embodiments. However, various modifications are possible within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, a detection means for detecting the operation of the clutch disconnection holding electromagnetic valve controlled by the main electronic control device is provided, and when the detection means detects an abnormality, the main electronic control device performs a normal operation. Since the communication signal is stopped, the emergency electronic control unit that detects this activates the backup solenoid valve to hold the clutch disengagement, and therefore, the solenoid valve for clutch disengagement holding of the main electronic control unit system. However, even if a failure occurs, there is an effect that the unexpected jumping out of the vehicle can be prevented by the backup.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 11 is a block diagram of a current detection circuit according to the present embodiment.
The figure is a processing flow diagram showing an example of the operation of the main electronic control unit,
FIG. 4 is a processing flowchart showing an example of the operation of the emergency electronic control unit, and FIGS. 5 and 6 are block diagrams showing a conventional configuration. 3 ... clutch actuator, 4 ... main electronic control unit, 5 ... emergency electronic control unit, 6 ... communication line, 7 ... vehicle speed sensor, V3 ... emergency solenoid valve, V1, V2, V4 ...
…solenoid valve.

Claims (1)

(57) [Claims] 1. A clutch control device for an automatic transmission, comprising a main electronic control device and an emergency electronic control device for backing up the main electronic control device, wherein the clutch is controlled by an electromagnetic valve. A normal hydraulic route for turning the clutch on and off upon opening and closing, an emergency hydraulic route for turning off the clutch by driving an emergency solenoid valve controlled by the emergency electronic control unit, and an electromagnetic for disengaging and holding the clutch in the normal hydraulic route. Failure detection means for detecting a failure due to poor energization of the valve, and backup means for stopping the normal hydraulic route and operating the emergency hydraulic route to maintain the clutch off state by the failure detection of the failure detection means. A clutch control device for an automatic transmission.