JPH0668397A - Collision preventing device for vehicle - Google Patents

Abstract

PURPOSE:To unify the braking control system of a vehicle and prevent a collision against a body by switching the shift range of an automatic gear to a parking range by an electric means unless the vehicle is braked when approaching a body within a prescribed distance range. CONSTITUTION:When a select switch 60 is switched by the operation of a shift lever, an actuator 50 is driven and controlled on the basis of the driving signal outputted from a range control part 20 corresponding to a current range signal, and consequently a range changeover valve 30 is switched to select a shift range of the automatic gear 10. When the parking range is selected, a parking rod mechanism 41 also operates at the same time to lock the output shaft of the automatic gear 10. When the vehicle is not braked although the vehicle approaches an obstacle, the automatic gear 10 is switched to the parking range to place the engine in an idling state and then the vehicle is stopped to prevent the vehicle from colliding against the obstacle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle collision prevention device provided with an automatic transmission whose shift range can be switched by electric means.

[0002]

2. Description of the Related Art As a conventional vehicle collision prevention device, for example, a technique disclosed in Japanese Patent Laid-Open No. 2-271278 is known. This is to prevent a collision of a vehicle with an object by automatically activating a brake when an object is approaching with a corner sensor that detects the approaching state of the vehicle with the object. Is.

[0003]

In the above vehicle collision prevention device, in order to automatically actuate the brake by the actuator, it is necessary to increase the power of the actuator very much, which leads to an increase in size of the actuator and a design problem. It is a disadvantage. Therefore, in the case of a vehicle equipped with an automatic transmission control mechanism that switches the shift range of the automatic transmission by an electric means, an automatic shift that can be easily switched instead of automatically operating the brakes. A method of automatically switching the shift range of the machine to the parking range to prevent the vehicle from colliding with an object can be considered (unknown).

However, in spite of the fact that the driver recognizes the approach of an object and is braking with a foot brake or the like,
If the parking range is switched every time an object approaches the vehicle, the driver will feel uncomfortable.

A technical object of the present invention is to solve the above-mentioned problem by unifying the control system for vehicle braking.

[0006]

In order to solve the above-mentioned problems, a vehicle collision prevention device according to the present invention is constructed as shown in FIG. That is, a control mechanism for an automatic transmission that electrically switches a shift range including a parking range of an automatic transmission of a vehicle based on a range switching signal, and an approach state detection unit that detects an approach state of a vehicle to an object. A braking state detecting means for detecting a braking state of the vehicle and a parking range for outputting a signal for switching the shift range of the automatic transmission to the parking range when the vehicle approaches an object within a predetermined distance and the vehicle is not braked. And a switching signal output means.

[0007]

In this structure, when the vehicle approaches the object within a predetermined distance while the vehicle is traveling and the vehicle is not braked, the shift range of the automatic transmission is electrically switched to the parking range to prevent the vehicle from colliding with the object. It can be prevented.

[0008]

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

FIG. 2 shows a system diagram of this embodiment. In FIG. 2, reference numeral 10 denotes an automatic transmission, 20 denotes a range control unit (control mechanism for automatic transmission) of the automatic transmission 10, 30
Represents a range switching valve of the automatic transmission 10 (control mechanism for automatic transmission).

A microcomputer is used as the range control unit 20, a read-only memory (ROM) in which a program necessary for various software processes for changing the shift range of the automatic transmission 10 is stored, and a central operation for executing this program. A processing unit (CPU), a writable memory (RA that temporarily stores variables necessary for a program)
It is mainly composed of M). The range controller 20 includes a select switch 60, a corner sensor 61 (approaching state detecting means), and a foot brake switch 6.
2 (braking state detecting means), side brake switch 6
3, ignition switch 65, valve position sensor 2
2. The respective detection signals output from the vehicle speed sensor 24 are input. Further, the range control unit 20 outputs signals to the actuator 50, the throttle opening control circuit 64, and the range indicator 25, respectively.

The select switch 60 is switched to a D (drive) range, an R (reverse) range, an N (neutral) range, and a P (parking) range by operating a shift lever (not shown) by a driver. And outputs the range signal to the range control unit 20. The corner sensor 61 is provided at the front and rear ends of the vehicle, detects the distance to the obstacle by the infrared light emitted from the infrared irradiation device and reflected on the surface of the obstacle, and outputs the distance signal to the range control unit 20. The foot brake switch 62, the side brake switch 63, and the ignition switch 65 output ON / OFF signals of the foot brake, the side brake, and the ignition key to the range control unit 20, respectively. The valve position sensor 22 indicates the switching position of the range switching valve 30, and the vehicle speed sensor 24 indicates the vehicle speed of the vehicle.
Output to 0.

The throttle opening control circuit 64 is a circuit for controlling the throttle opening of an engine (not shown),
When the automatic transmission is switched to the parking range as described later, it has a function of putting the engine in an idling state by a throttle fully closed signal from the range control unit 20. The range indicator 25 is provided on the instrument panel on the front of the driver's seat, and based on the signal from the range control unit 20,
The position corresponding to the current shift range of the automatic transmission 10 is lit and displayed with a green background color.

FIG. 4 is a perspective view showing an outline of the range switching valve 30 and its control system of the automatic transmission 10 of this embodiment.

The range switching valve 30 is of a spool valve type and is supplied with a line hydraulic pressure which is a basic hydraulic pressure for controlling the automatic transmission 10. By operating the spool 30a of the range switching valve 30 in the axial direction, the discharge port of the range switching valve 30 is switched to control engagement and release of a friction engagement device (not shown) for setting each shift range. .

A worm wheel 33 is fixed on the axis of the control shaft 32, and an actuator (DC motor) is provided.
A worm 54 formed on a drive shaft 52 of 50 meshes with the worm 54. Therefore, the rotational driving force of the actuator 50 is decelerated and transmitted to the control shaft 32 by the engagement of the worm 54 and the worm wheel 33.

The rotation of the control shaft 32 moves the spool 30a of the range switching valve 30 in the axial direction through the rotation of the detent lever 36 fixed on the shaft. In the vicinity of the worm wheel 33, the rotational position of the worm wheel 33, that is, the range switching valve 3
A valve position sensor 22 such as a variable resistor capable of detecting the switching position of 0 is arranged.

The detent lever 36 is fan-shaped, and a plurality of concave and convex portions 36a are formed on the outer circumference thereof. A roller 38a provided at the end of the detent spring 38 is engaged with one of the concave and convex portions 36a. 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.

A parking lock mechanism 41 is shown in FIG. The parking rod 43 connected to the detent lever 36 penetrates the parking cam 40 so as to be relatively movable. An engaging portion 43a is formed on the parking rod 43, and a spring 45 is interposed between the engaging portion 43a and the parking cam 40.

When the shift lever is operated to the P range position, the range switching valve 30 is switched to the P range position by driving the actuator 50, and the parking rod 4 is interlocked with the rotation of the detent lever 36 at this time.
3 moves to the right in FIG. At this time, the spring 45
The parking cam 40 also moves to the right by the spring force of, and 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 10 to lock the output shaft system of the vehicle.

Next, the operation of the present embodiment constructed as described above will be described. When the select switch 60 is switched by operating the shift lever, the actuator 50 is drive-controlled based on the drive signal output from the range control unit 20 in response to the range instruction signal at that time, whereby the range switching valve 30 is switched. The shift range of the automatic transmission 10 is selected. When the parking range is selected, the parking rod mechanism 41 also operates at the same time and the output shaft of the automatic transmission 10 is locked. Further, the position corresponding to the current shift range of the automatic transmission 10 is lit and displayed on the range indicator 25 with a green background color.

Next, the control contents of the range control unit 20 of this embodiment will be described with reference to the flow chart of FIG. This program is set in the main routine of the range control unit 20 together with other arithmetic processing, and the following processing is executed after execution of the determination of the shift speed and the like as other arithmetic processing.

First, in step 10, the current vehicle speed V of the vehicle detected by the vehicle speed sensor 24 is input, and in step 2
Go to 0. In step 20, it is determined whether the vehicle speed V is less than or equal to a predetermined value V0, and if it is less than or equal to the predetermined value V0, the process proceeds to step 30. Here, the predetermined value V0 is set to such an extent that the parking lock mechanism 41 is not damaged when the automatic transmission 10 is switched to the parking range and the parking lock mechanism 41 is operated in step 70 described later (for example, V0 =
5km / h).

The distance D between the vehicle and the obstacle detected by the corner sensor 61 in step 30 is input and step 4
Go to 0. In step 40, it is determined whether the distance D is less than or equal to the predetermined value D0, and if it is less than or equal to the predetermined value D0, the process proceeds to step 50. Here, the predetermined value D0 is set to such an extent that it does not come into contact with the obstacle before the automatic transmission 10 is switched to the parking range and the vehicle stops at step 70, which will be described later, (for example, D0 = 15 cm).

In step 50, it is determined whether the foot brake switch 62 is ON or OFF. If it is OFF, the process proceeds to step 60. This means that the driver has no intention of stopping the vehicle while the vehicle is traveling and an obstacle is approaching.

Therefore, if it is determined in step 60 that the cancel switch is OFF, the process proceeds to step 70,
The automatic transmission 10 is switched to the parking range, and a throttle fully closed signal is sent to the throttle opening control circuit 64 to put the engine in the idling state. The cancel switch is a switch that is set by the driver in advance so that the above control is not performed.

As described above, when the driver does not intend to stop the vehicle despite the obstacle approaching while the vehicle is traveling, the automatic transmission 10 is switched to the parking range and the engine is changed. By stopping the vehicle in the idling state, it is possible to prevent the vehicle from colliding with an obstacle. Here, the reason why the engine is in the idling state is to prevent the engine from running up after the vehicle is stopped.

If the foot brake switch 62 is ON in step 50, the process proceeds to step 80. This means that the driver is willing to stop the vehicle although an obstacle is approaching while the vehicle is traveling.

At step 80, the current vehicle speed V'is input again and the routine proceeds to step 90. In step 90, the vehicle speed V input in step 10 is compared with the vehicle speed V'input in step 80. If V-V 'is less than or equal to a predetermined value v, the process proceeds to step 60. This is the foot brake switch 62
Indicates that the vehicle is not decelerating despite being ON, that is, the driver intends to stop the vehicle but the degree of foot pedal depression is small. Therefore, if the cancel switch is determined to be OFF in step 60, the automatic transmission 10 is switched to the parking range in step 70, and a throttle fully closed signal is sent to the throttle opening control circuit 64 to put the engine in the idling state.

As described above, when the driver's foot brake is not so depressed and the vehicle is not braked even though an obstacle is approaching while the vehicle is traveling, the automatic transmission 10 is set to the parking range. By switching to, the engine is idling and the vehicle is stopped, it is possible to prevent the vehicle from colliding with an obstacle.

Here, in step 70, the automatic transmission 10
Is switched to the parking range, the engine is set to the idling state, and then the state is released if any one of the following conditions is satisfied. (1) Cancel switch ON (2) Side brake switch 63 ON (3) Ignition switch 65 OFF (4) When the select switch 60 is switched (5) When the vehicle speed sensor 24 confirms that the vehicle has stopped

Although the embodiments of the present invention have been described in detail above, it goes without saying that the present invention is not limited to such specific examples, and various modifications are possible within the scope of the claims. Are included.

[0032]

As described above, according to the present invention, when the vehicle approaches the object while the vehicle is traveling and is not braked, the shift range of the automatic transmission is electrically switched to the parking range to collide with the object of the vehicle. Can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a claim of the present invention.

FIG. 2 is an electric control system diagram for switching a shift range of an automatic transmission.

FIG. 3 is a flow chart diagram of an embodiment of the present invention.

FIG. 4 is a perspective view showing an outline of a range switching valve and its control system.

FIG. 5 is a diagram showing a parking lock mechanism.

[Explanation of symbols]

10 ... Automatic transmission 20 ... Range control unit (control mechanism for automatic transmission) 61 ... Corner sensor (approaching state detecting means) 62 ... Foot brake switch (braking state detecting means)

Claims (1)

[Claims] 1. An automatic transmission control mechanism for electrically switching a shift range including a parking range of an automatic transmission of a vehicle based on a range switching signal, and an approach for detecting an approaching state of an object of a vehicle. State detection means, braking state detection means for detecting the braking state of the vehicle, and a signal for switching the shift range of the automatic transmission to the parking range when the vehicle approaches an object within a predetermined distance and the vehicle is not braked. A vehicle collision prevention device comprising: a parking range switching signal output means for outputting