JPS61122038A - Gear parking apparatus of vehicle - Google Patents

Abstract

PURPOSE:To carry out securely gear parking operation and further prevent a vehicle from springing-out in the gear parking by supplying power source to an electronic control unit even after turning off the power source through a key switch. CONSTITUTION:A transistor 4 is provided in the electronic control circuit 2, and to the base of the transistor 4 are connected the ON contact of a key switch 5 connected to a power supply and an output port 2b of a central processing unit 2a provided in the electronic control unit 2 through a reverse- current preventing diodes 6, 7. To an input port 2d are connected an engine rotation sensor 8, a select lever switch 9 and the ON contact of the switch 5. Thus, in turning off the switch 5, when the engine is not stopped, a vehicle is prevented from abrupt springing-out due to the wrong operation of gear parking in the stand-by of a clutch left turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gear parking device for a vehicle, and more particularly to a gear parking device for a vehicle in which the clutch is engaged after the engine has stopped after the key switch is turned off. .

(Prior Art) Vehicles equipped with automatic transmissions are also equipped with automatic clutches. For example, by driving a piston in a cylinder using hydraulic pressure, a clutch release lever connected to a piston rod is actuated to engage or disengage the clutch.

Generally, in order to park a vehicle on a slope or the like, in addition to disabling the sub-brake, the gear may be set to a position other than neutral, such as first gear or reverse gear, for safety reasons. Therefore, if such a parking method is to be adopted in a vehicle equipped with an automatic clutch, the clutch must be engaged after the key switch is turned off. In this case, even if the starter key is turned off, the engine will stop immediately.If the clutch is engaged immediately after the starter is turned off, the engine will stall or the vehicle will jump out.

On the other hand, in response to this, a delay circuit is installed in the drive circuit of the clutch actuator, and the clutch is held in a disengaged state for several seconds even after the key switch is turned off, and the clutch is engaged after the delay operation is completed, making it possible to perform gear parking. However, for example, the patent application
This method has been proposed in the specification of No. 8-117224.

(Problem to be Solved by the Invention) However, in diesel vehicles, due to a malfunction in the engine stopper system, the engine may not stop completely even after the key switch is turned off and the above delay time has passed.
In such a case, if you try to engage the clutch and perform gear parking, the engine stall shock as described above will occur. Another problem is that the control device including the delay circuit is complicated and expensive.

An object of the present invention is to enable safe and reliable gear parking by engaging the clutch for the first time on the condition that the engine has stopped after the key switch has been turned off.

(Means for Solving the Problems) The present invention provides a first means for supplying power to an electronic control device even after the power is turned off by a key switch.

a second means for connecting the clutch after the engine has stopped after the power has been turned off and a shift operation to a gear position other than neutral has been performed; and a third means for connecting the power by the first means after the clutch has been engaged. This is a gear parking device for a vehicle having means.

(Function) When the key switch is turned on, power is supplied from the power supply to the electronic control unit, and then when the key is set in the starter position, the engine starts and the vehicle is ready to run. This running is performed optimally according to various driving conditions of the vehicle, and clutch and transmission control are also performed optimally. Now, turn off the key switch to park the car in gear. When the clutch is turned off, the clutch is disengaged and if the engine continues to rotate, check that the engine has stopped rotating.
It is possible to shift to a gear other than neutral based on the driver's operation. After shifting, the clutch is automatically engaged, power supply to the electronic control unit is stopped, and the gear parking operation is completed. This prevents the vehicle from jumping out in conventional gear parking when the key switch is turned off.

(Embodiment) FIG. 1 is a system block diagram for implementing the gear parking method according to the present invention. Reference numeral 1 denotes a power source such as a parachute mounted on the vehicle, 2 an electronic control device, and a power supply circuit 2c of the electronic control device 2 includes a relay switch 3a of the main relay 3.
Power is supplied from a power source 1 via the power source 1. 3b is a relay coil, one end of which is connected to the power supply 1, and the other end connected to the collector of the emitter-grounded transistor 4. This transistor 4 is provided within the electronic control circuit 2. The central processing unit 2a is provided with a read-only memory for control programs, a random access memory for input data, calculation results, and the like.

Further, the on contact of the key switch 5 connected to the power supply 1 and the output port 2h of the central processing unit 2a provided in the electronic control unit 2 are connected to the base of the transistor 4 through backflow prevention diodes 6.7, respectively. has been done. 2d
is a human-powered boat for inputting various signals for operation control to the central processing unit 2a, and this input boat 2d includes an engine rotation sensor 8 for detecting engine rotation, a select lever switch 9 for detecting the selector lever position, and a key. The on contact of switch 5 is connected. In addition, the output capacitor 2b includes a clutch actuator 1 which is controlled based on the results of arithmetic processing by the central processing unit 2a.
0 and mission actuator 11 are connected. Reference numeral 12 denotes an engine stopper connected to the ON contact of the key switch 5, which acts to cut off intake air and fuel when the engine is stopped.

Next, the operation of the system block diagram will be explained based on FIGS. 2 and 3.

First, in order to start the engine, the key switch 5 is turned to the on position by key operation. Therefore, the power supply voltage is input from the ON contact point of the key switch 5 as a signal S1 to the base of the transistor 4 via the diode 6. As a result, the relay coil 3b is energized, the relay switch 3a is closed, and power is supplied to the power supply circuit 2C of the electronic control unit 2 (step a).The power supply circuit 2C supplies this power to the central processing unit 2a, etc. distribute. Here, when the key switch 5 is set to the starter position by further key operation, the engine is started by the operation of the starter motor.

When the engine starts in this way, the engine rotation sensor 8
inputs the signal S2 to the central processing unit 2 &
In response to the input of this signal S2, the central processing unit 'fl2a outputs a drive holding signal S4 for the transistor 4 via the output port 2b.

In such a state, optimal clutch and gear control, that is, automatic shift control (EDS), is normally performed using output signals from the engine rotation sensor 8, select lever switch 9, vehicle speed sensor (not shown), accelerator sensor, etc. as input conditions. (step b).

After driving the vehicle in this manner, if the vehicle is to be parked on a slope, the key switch 5 is returned to the off position (step C). Then, the off signal is input to the input boat 2d, and the central processing unit 2a disengages the clutch by operating the clutch actuator 11 (step d). At the same time, the engine rotation sensor 8 continues to monitor the rotation of the engine ( Step e): If the engine continues to rotate, continue disengaging the clutch. In this way, when the engine stops, the select lever is operated, and a signal S3 corresponding to this operating position is output from the select lever switch 9, and when it is determined that the select lever is in the neutral position (step f) , the transmission actuator 11 is operated by the output signal S5 to shift the gear to neutral (step g), and the select lever is in 1st, 3rd, 4th, 5th, 2nd, or rear gear other than neutral. If it is determined that any of the positions has been operated (step h), the gears are selectively shifted to first speed, second speed, or rear, respectively (steps i, j).

k).

In this way, after performing a gear shift for gear parking,
The clutch actuator 10 is operated again to engage the clutch (step l), and the signal S4 from the central processing unit 2a is
Stop outputting. Therefore, since the transistor 4 is turned off, the operation of the main relay 3 is also turned off again (step m), and the power supply to the electronic control device 2 is cut off.

In this way, if the engine stops normally when the key switch 5 is turned off, the clutch and gear will switch after time T2 in FIG. 3 and gear parking will be executed for one hour T1, but the engine will stop. If not, by waiting with the clutch disengaged, it is possible to prevent the vehicle from suddenly jumping out due to an erroneous gear parking operation (Effects of the Invention) According to the present invention, In vehicles equipped with an automatic transmission, power can be supplied to the electronic control unit even after the key switch is turned off, so gear parking operations can be performed reliably, and the shift operation can be performed after the engine has stopped after the power is turned off. Since the clutch is connected, it is possible to prevent the vehicle from jumping out when the gear is parked, and since the power supply to the mold control device is cut off after the above operation, the mold control device can malfunction after the gear parking operation. It has many effects, such as not having to do anything.

[Brief explanation of drawings]

Fig. 1 is a system block diagram for explaining the gear parking method for a vehicle according to the present invention, Fig. 2 is a flowchart showing the control process of gear parking, and Fig. 3 is a time chart of signals of various parts of the system block diagram. . 1... Power supply, 2... Electronic control unit, 3... Main relay, 4... Transistor, 5... Key switch,
8... Engine rotation sensor, 9... Select lever switch, 10... Clutch actuator, 11...
・Mission actuator. Patent Applicant Isu (Jidosha Co., Ltd. Agent Patent Attorney Minoru Tsuji No. 1)
Figure 2

Claims (1)

[Claims] A first means for supplying power to the electronic control unit even after the power is turned off by a key switch, and a first means for connecting the clutch after the engine has stopped after the power has been turned off and a shift operation to a gear position other than neutral has been performed. A gear parking device for a vehicle, comprising: a second means; and a third means for cutting off power supply by the first means after the clutch is connected.