JPH0672296A - Automatic parking device of vehicle - Google Patents

Abstract

PURPOSE:To carry out a secure and a highly relaible parking lock by providing a parking deciding means to detect a signal from a car stop detecting means and to generate a signal, and driving an actuator to operate a parking lock mechanism when the signal of the parking deciding means is generated. CONSTITUTION:When a vehicle stops, a car stop detecting means detects it. When car speed is less than a specific value, for example, the car stop detecting means decides that the car is in a stopping condition and outputs a detecting signal. When this output continues for a specific time, a parking deciding means outputs a signal. Responding to this signal, a parking control means drives an actuator 50 so as to operate a parking lock mechanism. To a controller 4 to compose an automatic parking device, signals of a select switch 5, a steering angle sensor 6, a switch 7 to release the automatic parking control, a range position sensor 22 to detect the shift range of an automatic transmission 1, and a car speed sensor 9, are input respectively. By driving the actuator (a DC motor) 50, the converting operation of a range change-over valve 30 is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic parking apparatus for a vehicle that automatically performs parking operation under certain conditions.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 60-85049 discloses, as an example of a conventional automatic parking device, when a brake operation is performed and a predetermined time (for example, 1 second) elapses after a vehicle stop is detected. It is disclosed that a brake is automatically activated to put a vehicle in a parking state. According to this, the parking state can be achieved when the vehicle is stopped even if the brakes are slightly stepped on, so that it is possible to prevent the risk of the vehicle suddenly jumping forward in a collision from the rear, for example. .

[0003]

However, it is not reliable to keep the brake applied in order to maintain the parking state because the hydraulic pressure for stopping the vehicle is always required during the control. Is low, and the automatic hydraulic pressure generation control is required to realize it, so there is a problem that the configuration becomes complicated.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an automatic parking apparatus capable of achieving a parking state more reliably and easily.

[0005]

As shown in FIG. 1, the present invention is directed to a parking lock mechanism for mechanically locking the output shaft of an automatic transmission, an actuator for operating the parking lock mechanism, and a vehicle. Is detected that the vehicle is in a stopped state and generates a signal, parking determination means that detects that the signal is output from the vehicle stop detection means for a predetermined time and generates a signal, and the parking determination means The above problem is solved by having parking control means for driving the actuator to lock the parking lock mechanism when a signal is generated.

[0006]

In the device of the present invention, when the vehicle stops, the vehicle stop detecting means detects it. For example, when the vehicle speed is equal to or lower than a predetermined value, it is determined that the vehicle is stopped and a detection signal is output. When this output continues for a predetermined time, the parking determination means determines that parking should be performed and outputs a signal. In response to this, the parking control means drives the actuator to lock the parking lock mechanism to put the vehicle in the parking state. In addition, the cancellation of the parking state,
For example, it may be performed based on an operation such as stepping on the accelerator.

The actuator for locking the parking mechanism may be small in size, and since the output shaft of the automatic transmission is mechanically locked by this, the structure is simple and the operation is reliable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a system configuration diagram including the automatic parking device of the embodiment.

In the figure, 1 is an automatic transmission, 30 is a range switching valve for switching the shift range of the automatic transmission, and 50 is an actuator (DC motor) for operating the range switching valve 30.

The controller 4 constituting the shift control device and the automatic parking device is mainly composed of a microcomputer, and the controller 4 is provided with a signal and a steering angle of the select switch 5 composed of a push button or the like. The signal of the sensor 6 for detection, the signal of the switch 7 for canceling the automatic parking control, the signal of the range position sensor 22 for detecting the shift range of the automatic transmission, and the signal of the vehicle speed sensor 9 are input.

The controller 4 determines the shift range based on each of these signals, and drives the actuator 50 to switch the range switching valve 30 to achieve the determined shift range. Then, normally, the automatic transmission is controlled to the shift range according to the operation position of the select switch 5, but under certain conditions, the shift range is controlled regardless of the operation position of the select switch 5. Further, the controller 4 sets the current shift range of the automatic transmission 1 to
It also has a function of displaying on the indicator 10.

Next, the details of the structure of the range switching valve 30 for switching the shift range, the parking lock mechanism 41, and their surroundings will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the range switching valve 30 is a spool valve, and the range switching valve 30 is supplied with a line hydraulic pressure which is a basic hydraulic pressure for controlling the automatic transmission. The range switching valve 30 switches the discharge port by operating the spool 30a in the axial direction,
The engagement and disengagement of a friction engagement device (not shown) for setting each shift range is controlled.

Reference numeral 32 denotes a control shaft connecting the actuator 50 and the range switching valve 30, and a worm wheel 33 is fixed on the shaft 32. A worm 54 provided on the drive shaft 52 of the actuator 50 meshes with the worm wheel 33.
Therefore, the actuator 50 is attached to the control shaft 32.
The rotational driving force of is reduced and transmitted by the engagement of the worm 54 and the worm wheel 33.

The rotation of the control shaft 32 is achieved by the rotation of a detent lever 36 fixed on the shaft.
The spool 30a of the range switching valve 30 is moved in the axial direction. The worm wheel 3
In the vicinity of 3, the rotation position of this worm wheel 33,
That is, the range position sensor 22 such as a variable resistor that can detect the switching position of the range switching valve 30 is arranged.

The detent lever 36 is fan-shaped and has a plurality of concave and convex portions 36a on its outer circumference. The roller 38 provided at the end of the detent spring 38 is fitted into one of the concave and convex portions 36a.
a is engaged. This constitutes a detent mechanism 34 that determines the rotational position of the control shaft 32, that is, the plurality of range switching positions of the range switching valve 30.

FIG. 4 shows the details of the parking lock mechanism 41. The parking rod 43 connected to the detent lever 36 penetrates the parking cam 40 so as to be relatively movable. Further, the parking rod 43 is formed with an engaging portion 43a, and the engaging portion 43a and the parking cam 4 are
A spring 45 is interposed between the spring 0 and zero.

When the select switch 5 is operated to the parking (P) range position, the actuator 50 is driven to switch the range switching valve 30 to the P range position, and in conjunction with the rotation of the detent lever 36 at this time. The parking rod 43 moves to the right in FIG. At this time, the parking cam 40 also moves to the right by the spring force of the spring 45, gets over the parking bracket 46, and is pushed up to the position shown by the dotted line in FIG. By the action of the parking cam 40, the parking claw 42 is meshed with the parking gear 44 fixed to the output shaft of the automatic transmission 1 to lock the output shaft system of the vehicle. The parking lock mechanism 41 is configured as described above.

Next, the control contents of the controller 4 will be described.

The controller 4 repeatedly executes the automatic parking control flow shown in FIG. 5 at a predetermined timing.

When this flow starts, first, in steps 101, 103, 105 and 107, a precondition for checking whether or not automatic parking is performed is checked. The prerequisites are:

The operation range designated by the select switch 5 is the neutral (N) range. The automatic parking release switch 7 is off. The steering angle is equal to or greater than the predetermined angle θo. The vehicle speed V is equal to or lower than the predetermined value Vo.

Only when all of these conditions are met,
Go to step 109.

The reason for adding the condition (1) is that if the vehicle is being towed, an inconvenient situation will occur if automatic parking is executed. In such a case, turning on this switch automatically This is to prevent the parking from being executed. Therefore, turning off this switch is one of the conditions for automatic parking.

The reason for including the condition (1) is that the normal steering angle is small and the risk of the driver's impact when the vehicle starts to run is small when the vehicle is straight ahead even if a rear-end collision occurs. Because there are things that can be done
This is because the need for automatic parking is low, but if the steering angle is larger than a certain degree, there is a great risk of jumping into another lane when a rear-end collision occurs, and in this case, the need for automatic parking is high.

When all the above conditions are satisfied, step 10
If the process proceeds to step 9, the state of the timer flag FLV is checked here. Since the timer flag FLV is "0" for the first time, the process proceeds to step 111, the timer Tv is started and the timer flag FLV is set to "1". To do.

Then, it is judged in step 115 whether or not a predetermined time To has passed after satisfying the above conditions, and if the above conditions are continuously satisfied for a predetermined time, the routine proceeds to step 117. , The actuator 50 is automatically driven to switch the shift range from the N range to the P range. As a result, the parking lock mechanism 41 operates and the output shaft of the automatic transmission 1 is mechanically locked.

Therefore, unlike the parking state by the brake, a reliable and highly reliable lock is possible. or,
It is easy to control because it is not necessary to constantly control the hydraulic pressure as with a brake.

On the other hand, if any one of the above conditions is not satisfied or is not satisfied, the process proceeds to step 113. In this step 113, the timer Tv is reset and the timer flag FLV is reset, and then the routine proceeds to step 119, where the shift range is shifted to the normal operation range. If the timer value is less than or equal to the predetermined value, the process also goes to step 119.

As described above, another control is performed through step 117 or step 119.

[0032]

As described above, according to the automatic parking apparatus of the present invention, when it is determined that parking should be performed, not the brake but the parking lock mechanism is operated, so that the lock is reliable and the reliability is high. . Moreover, since the parking lock mechanism does not always require a high hydraulic pressure for its operation, the structure of the control system can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing the gist of the present invention.

FIG. 2 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 3 is a perspective view showing a detailed configuration of the embodiment.

FIG. 4 is a side view showing details of the parking lock mechanism in the embodiment.

FIG. 5 is a flowchart showing a control operation by the controller 4 of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Automatic transmission 4 ... Controller 5 ... Select switch 6 ... Steering angle sensor 9 ... Vehicle speed sensor 30 ... Range switching valve 41 ... Parking lock mechanism 50 ... Actuator

Claims (1)

[Claims] 1. A parking lock mechanism for mechanically locking an output shaft of an automatic transmission, an actuator for operating the parking lock mechanism, and a vehicle stop detecting means for detecting that a vehicle is in a stopped state and generating a signal. A parking judging means for generating a signal by detecting that a signal has been output from the vehicle stop detecting means for a predetermined time; and when the signal is generated from the parking judging means, the actuator is driven to lock the parking lock mechanism. An automatic parking device for a vehicle, comprising: parking control means to be operated.