JP3985095B2 - Vehicle parking brake device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parking brake device for a vehicle, and more particularly to an electric parking brake device.
[0002]
[Prior art]
As seen in Japanese Utility Model Laid-Open Nos. 63-189874, 64-26569, and Japanese Patent Application Laid-Open No. 2001-106060, a parking brake device for fastening a parking brake using an electric motor has been proposed. It is starting to be put into practical use.
[0003]
In such an electric parking brake device, various safety measures, that is, detection of abnormal states are incorporated. For example, Japanese Patent Laid-Open No. 2001-106060 proposes preparing various sensors to detect abnormalities. .
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a parking brake device for a vehicle provided with a means for avoiding occurrence of an abnormality, with respect to ensuring a predetermined fastening force.
[0005]
[Means for Solving the Problems]
According to the present invention, such a technical problem is
A parking brake device for a vehicle that fastens a parking brake by operating a motor,
A manual switch operable by a driver to select a normal parking mode in which the parking brake is fastened with a first fastening force and an increase mode in which the parking brake is fastened with a second fastening force larger than the first fastening force; ,
A normal parking circuit that can be switched by the manual switch and an increase circuit;
In the normal parking circuit, when a driver operates the manual switch to select the normal parking mode, power supply to the motor is started and the motor rotates in a direction in which the parking brake is engaged. A normal parking detection switch for stopping power supply to the motor when the parking brake is in a state of exerting the first fastening force;
In the increase circuit, when the driver operates the manual switch to select the increase mode, power supply to the motor is started and the motor rotates in the direction in which the parking brake is engaged. A parking limit detection switch for stopping power supply to the motor when the parking brake is in a state of exerting the second fastening force,
The parking limit detection switch constitutes a part of the normal parking circuit, and the parking limit detection switch and the normal parking detection switch are connected in series in the normal parking circuit ,
The normal parking circuit has a power supply connection for connecting a power source and the motor,
The parking limit detection switch, the normal parking detection switch, and the manual switch are connected to the power supply connection in order from the power source side.
Vehicle parking, wherein the increase circuit has a second connection for connecting the manual limit switch between the parking limit detection switch and the normal parking detection switch of the normal parking circuit. This is accomplished by providing a braking device.
[0006]
That is, according to the present invention, the parking limit detection switch for controlling the increase / decrease is incorporated in the normal parking circuit for using the parking brake with the normal fastening force, and the parking limit detection switch is used as the normal parking detection switch. For example, a situation in which the normal parking circuit has malfunctioned and the motor operation cannot be stopped with the first fastening force even though the normal parking mode is activated. Even if it becomes, if it becomes 2nd fastening force larger than 1st fastening force, the electric power feeding to a motor can be stopped with a parking limit detection switch. That is, the parking limit detection switch connected in series with the normal parking detection switch functions as a backup for the normal parking detection switch.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment of the present invention, an arm which is a mechanical structure that operates in relation to a motor is prepared, and a configuration in which a normal parking detection switch and a parking limit detection switch are turned OFF by engaging with the arm is provided. It is good to adopt. In order to determine the abnormality of the normal parking circuit, typically, a control means such as a CPU is prepared, and voltage signals are inputted to the control means from a plurality of points of the normal parking circuit and obtained from the plurality of points. It is better to determine that an abnormality has occurred when the combination of the signals is in a combination state that cannot be considered if it exists. Further, it is preferable to provide an operation source for supplying a signal from the control means to the parking limit detection switch and forcing the parking limit detection switch to be turned off.
[0008]
In the embodiment of the present invention, the manual switch further includes a release mode for releasing the parking brake, and further includes a release circuit that can be switched by the manual switch. The release circuit includes: When the driver operates the manual switch and selects the release mode, power supply to the motor is started, the motor rotates in the direction to release the parking brake, and the motor is released when the parking brake is released. A release detection switch is provided for stopping the power supply to the.
[0009]
The power supplied to the motor for releasing the parking brake is preferably routed through the ignition SW. By passing the ignition switch, there is no possibility of releasing the parking brake when the engine is stopped.
[0010]
In the increase / decrease mode, when this is selected, a predetermined additional fastening force may be realized unconditionally, but this additional fastening force may be left to the driver's will. . That is, in the increase / decrease mode, the driver selects the increase / decrease mode by supplying power to the motor for a time corresponding to the time during which the driver operates the manual switch and selects the increase / decrease mode. You may make it implement | achieve the additional brake fastening force according to time.
[0011]
These and other objects and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention.
[0012]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIGS. 1-4 shows the principal part of the mechanical structure of an electric parking brake system. As will be described in detail later, the electric parking brake system 1 has a normal parking mode in which the brake is engaged with a normal force and an increase mode in which the brake is engaged with an increased force when parking on a steep slope, for example. Have.
[0014]
The parking brake system 1 has an electric motor 2 as an actuator, and the output of the motor 2 is output from an output shaft 3 a via a gear train 3. A rotating disk 5 is rotatably attached to the output shaft 3a via a bearing 4. Further, one end of an arm 6 is fixed to the output shaft 3 a, and the arm 6 extends radially outward from the output shaft 3 a along the outer surface of the rotating disk 5.
[0015]
A pin 7 is fixed to the outer peripheral portion of the rotating disk 5, and a parking brake (not shown) is connected via a cable 8 having one end fixed to the pin 7. With reference to the drawings, the parking brake is brought into a brake engagement state when the cable 8 is pulled rightward, and is brought into a brake release state when the cable 8 moves leftward. That is, when the rotating disk 5 rotates clockwise in FIG. 3, the brake is fastened, and when it rotates in the opposite direction, that is, counterclockwise, the brake is released.
[0016]
A tension spring 9 is interposed between the arm 6 and the rotating disk 5, and the arm 6 is urged counterclockwise (direction to release the brake) by the spring 9. That is, one end of the spring 9 is fixed to the tip of the arm 6, and the other end is fixed to the rotating disk 5, and the position fixed to the rotating disk 5 is brake-released more than the arm 6. On the side. If a compression spring is provided in place of the tension spring 9, this compression spring may be disposed on the brake fastening side with respect to the arm 6.
[0017]
A first position detection switch 10 is disposed on the counterclockwise side of the outer peripheral portion of the rotating disk 5 with the tip portion of the arm 6 interposed therebetween, and a second position detection switch 11 is disposed on the clockwise side. These first and second position detection switches 10 and 11 are both fixed to the rotating disk 5. As will be apparent from the following description, the first position detection switch 10 detects a state in which a normal parking brake force is generated, and is referred to as a normal parking detection switch in the following description. The second position detection switch 11 detects a state in which the maximum parking brake force is generated, and is referred to as a parking limit detection switch in the following description.
[0018]
The normal parking detection switch 10 has an operating element 10 a, and this operating element 10 a is arranged so as to face the arm 6. Similarly, the actuator 11 a of the parking limit detection switch 11 is arranged so as to face the arm 6. That is, both the actuators 10a and 11a are arranged at intervals in the swing region of the arm 6 with the arm interposed therebetween.
[0019]
Both the actuators 10a and 11a are spring-biased in a direction protruding from the switch body. The normal parking detection switch 10 is turned on when the actuator 10a is pushed into the switch body against the spring force. The parking limit detection switch 11 is turned off when the actuator 10a is pushed into the switch body against the spring force.
[0020]
The rotating disk 5 has a circular outer peripheral contour as a whole, but has a cam portion 13 that partially protrudes outward.
[0021]
The vehicle body (not shown) is provided with a third position detection switch 15 adjacent to the cam portion 13 of the rotating disk 5, and the tip of the actuator 15a of the third position detection switch 15 is connected to the cam face. It is in contact with 13a. In the third position detection switch 15 as well, the actuator 15a is spring-biased in a direction protruding from the switch body, and is turned off when the actuator 15a is pushed into the switch body against the spring force. . The third position detection switch 15 detects a state in which the parking brake is released (released), as will be apparent from the following description, and is referred to as a release detection switch in the following description.
[0022]
The list of the relationship between the ON / OFF of the first to third position detection switches 10, 11, 15 and the operation of the actuators 10a, 11a, 15a is as follows.
[0023]
Actuator Retraction Extension
Normal parking detection SW (10) ON OFF
Parking limit detection SW (11) OFF ON
Release detection SW (15) OFF ON
[0024]
As illustrated in FIG. 5, the electric parking brake system 1 includes a manual switch 20 that is operated by a driver. By operating the manual switch 20, a release mode that releases a brake, a normal parking mode, and an increase mode And can be switched alternatively. The type of the manual switch 20 and the position of the manual switch 20 are arbitrary and are not particularly limited. However, in the illustrated example, the manual switch 20 is arranged at the center portion of the instrument panel 21 (see FIG. 6).
[0025]
The illustrated manual switch 20 may be, for example, a push-type switch. Here, the manual switch 20 includes a slide switch that can take three positions, and the slide switch includes an operation knob 22. That is, with reference to FIG. 5, the manual switch 20 has a release position P1 (brake release SW: ON) as a first position, and then a parking position P2 (parking SW: ON) as a second position. Next, there is an increase position P3 (increase SW: ON) which is a third position, and these positions P1 to P3 are linearly arranged, and the user slides the operation knob 22 The operation knob 22 can be set at each of the first to third positions.
[0026]
As a modification, by providing a spring (not shown) that biases the operation knob 22, when the driver slides the operation knob 22 from the parking position P2 to the increase position P3, the increase SW is turned ON. When the hand is released from the operation knob 22, the operation knob 22 may be returned to the parking position P2 by a spring force (FIG. 7). At that time, in the case of switching to the increase / decrease mode, it is preferable that the brake fastening force be increased only while the operation knob 22 is positioned at the increase / decrease position P3. The brake engagement force can be arbitrarily adjusted.
[0027]
FIG. 8 shows a circuit 30 included in the electric parking brake system 1. The circuit 30 includes a first circuit or normal parking circuit 31, a second circuit or increase circuit 32, a third circuit or brake release circuit 33, and a relay switch 34 associated with the manual switch 20. These first to third circuits 31 to 33 are alternatively selected by switching operation of the manual switch 20 and the relay switch 34.
[0028]
Referring also to FIG. 9, the normal parking circuit 31 has a connection 35 that connects the battery B and the first terminal of the electric motor 2, and the parking limit is detected in this connection 35 in order from the battery B side. A contact point P2 of the parking position (parking SW) of the switch 11, the normal parking detection switch 10, and the manual switch 20 is connected in series. The first circuit 31 also has a connection 36 for connecting the other terminal of the electric motor 2 and the ground Gnd. The connection 36 is connected to the protective resistor R1 and the contact P2 of the relay switch 34 in this order from the motor 2 side. Are connected in series.
[0029]
That is, in the normal parking circuit 31, the parking limit detection switch 11 and the normal parking detection switch 10 are arranged in series. For example, an abnormality occurs in the normal parking circuit 31, and the normal parking circuit 31 is operated in the normal parking mode. Nevertheless, even when the operation of the motor 2 cannot be stopped by the first fastening force, if the second fastening force is greater than the first fastening force, the parking limit detection switch 11 The power supply to the motor can be stopped.
[0030]
Referring also to FIG. 10, the increase circuit 32 is configured by sharing a part of the normal parking circuit 31. That is, it has the connection 37 which connects between the parking limit detection switch 11 of the connection 35 in the normal parking circuit 31 and the normal parking detection switch 10 and the manual switch 20, and the other end of the connection 37 is a manual switch. It is connected to a contact point P3 at 20 increase positions (enlargement SW). Further, the contact P3 of the relay switch 34 is grounded by a connection 38.
[0031]
Referring also to FIG. 11, the brake release circuit 33 includes a connection 38 that connects the ignition (Ig) SW and the contact P <b> 1 of the relay switch 34, and the release detection switch 15 is interposed in the connection 38. . Further, the contact point P1 of the release position (brake release SW) of the manual switch 20 included in the third circuit 33 is grounded by the connection 39.
[0032]
Note that the resistor R2 and the capacitor C, which are seen in FIG. 8 and are in parallel with the motor 2, are protective elements for absorbing the electromotive force generated when the motor 2 stops rotating.
[0033]
The circuit 30 of the electric parking brake system 1 is linked to an alarm system 50 and a display system 51 (FIG. 8), and the alarm system 50 notifies the driver of the occurrence of an abnormality. That is, the alarm system 50 and the display system 51 include a CPU 52, and the following signal is input to the CPU 52 from the parking brake system circuit 30 via the interface 53.
[0034]
(A) Signal a: Voltage Va between the ignition (Ig) SW and the release detection switch 15;
(B) Signal b: Voltage Vb between the release detection detection switch 15 and the contact P1 of the relay switch 34;
(C) Signal c: Voltage Vc between the motor 2 and the relay switch 34;
(D) Signal d: Voltage Vd between the manual switch 20 and the motor 2;
(E) Signal e: Voltage Ve between the normal parking detection switch 10 and the contact P2 of the manual switch 20;
(F) Signal f: Voltage Vf between the parking limit detection switch 11 and the normal parking detection switch 10;
(G) Signal g: Voltage Vg between battery B and parking limit detection switch 11;
[0035]
From the CPU 52, a control signal is output to the first light emitting diode as the alarm means 50, and a control signal is output as the display means 51 to the second light emitting diode.
[0036]
Next, the operation of the electric parking brake system 1 is related to the operation of the manual switch 20. (1) Brake release (release), (2) Normal parking brake engagement, (3) Maximum parking brake engagement (increase) This will be explained separately.
[0037]
Brake release (release)
The state after the operation knob 22 of the manual switch 20 is set to the release position P1 and the parking brake is actually released, that is, the state after release is as follows with reference to FIG.
[0038]
(1) The terminal P1 of the manual switch 20 is in the ON state.
(2) The arm 6 is in a state of being relatively pulled toward the normal parking detection switch 10 by the spring 9, and as a result, the normal parking detection switch 10 is in an ON state.
(3) Since the parking limit detection switch 11 is not engaged with the arm 6, the operating element 11a is in the extended state, and is therefore in the ON state.
(4) The third position detection switch 12 is in a state in which the actuator 15a is pushed into the switch body by the cam portion 13 of the rotating disk 5, whereby the release detection switch 15 is turned off. is there.
[0039]
Normal parking mode When the driver moves the operation knob 22 of the manual switch 20 to set the parking position P2, the following operation is performed.
[0040]
When the normal parking detection switch 10 is ON, the parking limit detection switch 11 is ON, and the release detection switch 15 is OFF, the terminal P2 of the manual switch 20 is ON.
[0041]
Accordingly, when the parking terminal P2 of the manual switch 20 is turned on, the first circuit 31 (FIG. 9) is energized and power feeding to the motor 2 is started, whereby the motor 2 pulls the cable 8 ( The operation of rotating in the clockwise direction in the example shown in FIG.
[0042]
Next, the rotating disk 5 is rotated together with the arm 6 by the force of the spring 9 until the motor 2 rotates to a predetermined rotation angle. Accordingly, the rotation of the rotating disk 5 accompanying the start of rotation of the motor 2 causes the cam portion 13 to move away from the release detection switch 15, whereby the release detection switch 15 changes to the ON state.
[0043]
When the rotation angle of the motor 2 reaches a predetermined value or more, the spring 9 is pulled through the rotating disk 5 due to the tension acting on the cable 8 and the spring 9 is extended, whereby the rotating disk 5 and the arm 6 are supplied. The rotation is released and the arm 6 starts to rotate in the clockwise direction relative to the rotating disk 5, whereby the arm 6 leaves the normal parking detection switch 10 and starts to rotate toward the parking limit detection switch 11. .
[0044]
When the arm 6 moves away from the normal parking detection switch 10, the normal parking detection switch 10 changes to an OFF state, and power supply to the motor 2 is stopped (FIG. 12). Thereby, in the parking brake system 1, the motor 2 stops rotating in a state where a normal parking brake force is generated.
[0045]
When the driver slides the operation knob 21 in the normal parking brake state to return to the brake engagement force release or release position, the release detection switch 15 remains in the ON state, and the terminal P1 of the manual switch 20 changes to the ON state. Therefore, the release circuit 33 (FIG. 11) is energized, and the motor 2 rotates in the direction of returning the cable 8 (counterclockwise in the illustrated example) (brake release).
[0046]
Increase mode When the driver sets the operation knob 22 of the manual switch 20 to the increase position P3, when the terminal P3 (increase SW) of the manual switch 20 is turned on and separated from the increase position P3. The terminal P3 (increase SW) is turned off.
[0047]
Accordingly, when the terminal P3 of the manual switch 20 is turned on, the increase circuit 32 (FIG. 10) is energized, the power supply to the motor 2 is started, and the direction in which the cable 8 is pulled (clockwise in the example shown). ).
[0048]
The rotation of the motor 2 continues further beyond the normal parking state, and the spring 9 is further extended along with this rotation operation, so that the arm 6 can be rotated with the rotating disk 5. In the released state, it rotates in the clockwise direction independently.
[0049]
When the ON state of the terminal P3 is continued and the arm 6 rotates until it abuts against the parking limit detection switch 11, the actuator 11a of the parking limit detection switch 11 is pushed in, and the parking limit detection switch 11 changes to the OFF state, Power supply to the motor 2 is stopped (FIG. 12). As a result, the parking brake stops the rotation operation of the motor 2 in a state where the maximum parking brake force is generated.
[0050]
In this maximum parking brake state, when the driver slides the operation knob 21 to set the brake engagement force release, that is, to the release position, the release detection switch 15 is ON and the terminal P1 of the manual switch 20 is ON. Therefore, the third circuit 33 is energized, and the motor 2 rotates in the direction to return the cable 8 (counterclockwise in the illustrated example).
[0051]
In addition, for example, a situation where the normal parking detection switch 10 is stuck and the operation of the motor 2 cannot be stopped by a normal parking brake force (first fastening force) despite being operated in the normal parking mode. In this case, the arm 6 rotates until it comes into contact with the parking limit detection switch 11, and the parking limit detection switch 11 is changed to the OFF state. At this time, since the parking limit detection switch 11 and the normal parking detection switch 10 are arranged in series in the normal parking circuit 31, the normal parking detection switch 10 cannot stop power supply to the motor 2. Even if there is, the parking limit detection switch 11 functions as a backup, and the power supply to the motor 2 can be stopped by the parking limit detection switch 11.
[0052]
When the above-described normal parking brake engagement and increase operations are performed normally, the CPU outputs a lighting signal to the display means 51, whereby the display means 51 (light emitting diode) is turned on and the parking brake is engaged. Visually inform the driver that it is in condition.
[0053]
Since the power for brake release (release) is supplied to the motor 2 via the ignition SW, the parking brake release operation is performed on condition that the ignition SW is in the ON state (engine start or engine operation). As a result, the parking brake can be prevented from being inadvertently released while the engine is stopped.
[0054]
With respect to the parking brake system 1, an operation procedure by operating the manual switch 20 that can be switched to the above-described three stages will be described below with reference to FIG. The following operation procedure is an example in which a CPU (not shown) is added to the parking brake system 1.
[0055]
When the driver slides the operation knob 22 and sets it to the brake release position P1 (release SW: ON), it is determined YES in step S1 and proceeds to step S2, in which the motor 2 releases the parking brake (cable 8). Rotate in the return direction). Accordingly, the state in which the arm 6 is in contact with the normal parking detection switch 10 is changed to the state in which it is maintained or in contact, and the normal parking detection switch 10 is turned on (step S3). Next, in step S4, it is determined whether or not the release detection switch 15 is in an OFF state. In the initial stage of release from the brake engagement state, the release detection switch 15 is in the ON state because the actuator 15a of the release detection switch 15 is in the extended state. Therefore, NO is determined in step S5, the process returns to step S1, the motor 2 continues to rotate, and the brake release operation is continued.
[0056]
When the release operation is terminated, the cam face 13a of the rotary disk 5 pushes the actuator 15a of the release detection switch 15 into the switch body, whereby the release detection switch 15 is turned OFF, and thereby step S5. Then, the rotation of the motor 2 is stopped. This completes the release of the parking brake.
[0057]
Next, when the driver operates the manual switch 20 to set the parking position P2 (parking SW: ON), the process proceeds from step S1 to step S6 to step S7, and the direction in which the motor 2 engages the parking brake (cable 8). Rotate in the pulling direction). As the motor 2 rotates, the rotating disk 5 is rotated together with the arm 6, so that the release detection switch 15 is turned on (step S8). The arm 6 is initially in contact with the normal parking detection switch 10, and the normal parking detection switch 10 is in an ON state.
[0058]
The ON / OFF state of the normal parking detection switch 10 is determined in step S9. When the normal parking detection switch 10 is in the ON state, the process returns to steps S1, S6, and S7, and the rotation operation of the motor 2 is continued. When the parking brake is engaged with a normal braking force, the spring 9 extends to release the rotation of the rotating disk 5 and the arm 6, and the arm 6 moves away from the normal parking detection switch 10. As a result, the normal parking detection switch 10 changes to the OFF state. Thereby, it determines with YES (normal parking brake detection switch: OFF) by step S9, progresses to step S10, and rotation of the motor 2 is stopped. This completes the engagement of the parking brake (normal parking brake state).
[0059]
When the driver operates the manual switch 20 to set the increase position P3 (increase SW: ON), the process proceeds to step S11 through step S1 and step S6, where YES is determined in step S11, and the process proceeds to step S12. Then, the motor 2 rotates in a direction in which the parking brake is more strongly engaged (a direction in which the cable 8 is further pulled).
[0060]
As the motor 2 rotates, the arm 6 moves away from the normal parking detection switch 10 toward the parking limit detection switch 11. Until the arm 6 comes into contact with the parking limit detection switch 11, the normal parking detection switch 10 is in an OFF state, and the parking limit detection switch 11 is in an ON state. The state of the parking limit detection switch 11 is determined in step S13. Initially, since the parking limit detection switch 11 is in the ON state, it is determined NO, and after steps S1, S6, S11, the motor 2 is determined in step S12. The rotation continues.
[0061]
When the arm 6 comes into contact with the parking limit detection switch 11, the parking limit detection switch 11 is changed to an OFF state. This change in state is determined in step S13, the process proceeds to step S14, and the rotation of the motor 2 is stopped. The This completes the increase of the parking brake (maximum parking brake state).
[0062]
Next, when the driver slides the operation knob 22 and sets the brake release position P1 (release SW: ON), the process proceeds from step S15 to step S16, in which the motor 2 releases the parking brake (direction in which the cable 8 is returned). Rotating operation. Along with this, the arm 6 moves away from the parking limit detection switch 11, so that the parking limit detection switch 11 changes to the ON state (step S17). Finally, the release detection switch 15 is turned OFF, so that the motor Is stopped (step S18). In addition, by providing step S15 for monitoring ON / OFF of the release SW after step S14, after the maximum parking brake state is reached, only the parking brake release operation can be performed. Yes.
[0063]
Modified example of operation of parking brake (FIG. 14)
With respect to the parking brake system 1, as the manual switch 20, when the driver slides the operation knob 22 from the second position to the third position as described above with reference to FIG. When the hand is released, a switch in which the operation knob 22 is returned to the second position by a spring force and a two-stage switch of a release position and a parking position are prepared. In addition to this, for example, a push type button switch is provided. An operation procedure for increasing and pulling the cable 8 until the maximum parking brake force is obtained by pushing and turning on this button switch will be described below with reference to FIG.
[0064]
First, in step S20, for example, initial setting such as resetting of a flag is performed. Then, in step S21, it is determined whether or not the increase / decrease flag is set. The technical meaning of this increase flag will become clear from the following description.
[0065]
The operations in the next steps S22 to S31 are the same as those in steps S1 to S10 described above, and steps S22 to S31 correspond to steps S1 to S10, respectively, and thus description thereof is omitted.
[0066]
When the driver pushes the button switch for increase / decrease, the process proceeds from step S32 to step S33, and the button switch is turned on (YES). It rotates in the direction of increase). Next, in step S34, an increase / decrease flag is set.
[0067]
As the motor 2 starts rotating, the arm 6 moves away from the first position (normal parking brake) detection switch 10 and rotates toward the second position (increase parking brake) detection switch 11. Until the arm 6 comes into contact with the parking limit detection switch 11, the normal parking detection switch 10 is in an OFF state, and the parking limit detection switch 11 is in an ON state.
[0068]
The state of the parking limit detection switch 11 is determined in step S35. Initially, since the parking limit detection switch 11 is in the ON state, it is determined NO and the process returns to step S21. Now, since the increase / decrease flag is set, it is determined as YES in this step S21, and the rotation operation (brake increase / decrease) of the motor 2 is continued by drawing a loop of steps S35 and S21. .
[0069]
When the arm 6 comes into contact with the parking limit detection switch 11 due to the rotation of the motor 2, the parking limit detection switch 11 is changed to an OFF state. This state change is determined in step S35, and the process proceeds to step S36. The rotation is stopped. This completes the increase of the parking brake (maximum parking brake state).
[0070]
Next, when the driver slides the operation knob 22 to set the brake release position P1 (release SW: ON), the process proceeds from step S37 to step S38, in which the motor 2 releases the parking brake (direction in which the cable 8 is returned). Rotating operation. Next, in step S39, the increase / decrease flag is reset. Since the arm 6 is separated from the parking limit detection switch 11 by the rotation operation of the motor 2, the parking limit detection switch 11 is changed to the ON state (step S40), and finally the release detection switch 15 is turned OFF. As a result, the operation of the motor stops (step S41).
[0071]
Other variations of parking brake operation (FIGS. 15 and 16)
Regarding the parking brake system 1, as the manual switch 20, the driver slides the operation knob 22 from the second position to the third position as described above with reference to FIG. 7, and the operation knob 22 is moved to the third position (increase position). The operation procedure in the case of adopting a mechanism of a type that increases the brake fastening force only while it is positioned at) will be described below with reference to FIG.
[0072]
The operation procedure described below is based on the assumption that the driver needs a stronger braking force after the driver sets the operation knob 22 to the parking position P2 and is engaged with the normal braking force. This is based on the premise that the operation knob 22 is slid to the increase position (third position). If the operation procedure is considered including the use mode in which the driver slides the operation knob 22 from the beginning to the third position (extraction position), it is needless to say that the operation procedure may be modified to suit this. It is.
[0073]
In FIG. 15, the operations of steps S50 to S56 are substantially the same as those of steps S20 to S26 (FIG. 14) described above, and steps S50 to S56 correspond to steps S20 to S26, respectively. The operation flag is reset in the initialization step in step S50 and in step S57 subsequent to step S56. The technical meaning of this activation flag will become clear from the following description.
[0074]
Steps S58 to S62 are operation procedures when the driver operates the operation knob 22 to set the parking position P2, and this operation procedure is substantially the same as steps S27 to S31 (FIG. 14) described above. Yes, steps S58 to S62 correspond to steps S27 to S31, respectively. When the operation in the parking mode is completed and the engagement state is established with the normal braking force, the operation flag is set in step S63.
[0075]
For example, assuming that a strong brake engagement force is required on a slope, when the driver slides the operation knob 22 and sets it to the increase position P3, the process proceeds from step S58 to step S64, and whether the operation flag is set. Determine whether or not. Since the operation flag has already been set in step S63, YES is determined in step S64, and the process proceeds to step S65 to determine whether or not the increase switch is in the ON state. Since it is now when the operation knob 22 is set to the increase / decrease position P3, it is determined as YES and the process proceeds to step S66 of the switch, in which the motor 2 more strongly engages the brake (cable 8 is increased). Direction), and at the start of this rotation operation, an increase / decrease flag is set in the next step S67.
[0076]
In the next step S68, it is determined whether or not the parking limit detection switch 11 is in the OFF state. When the rotation operation of the motor 2 is started, the arm 6 moves away from the first position (normal parking brake) detection switch 10 and rotates toward the second position (parking limit detection) detection switch 11. Therefore, in the initial stage of the rotation operation of the motor 2, the arm 6 is not in contact with the parking limit detection switch 11, and as described above, in this state, the parking limit detection switch 11 is in the ON state. It is determined as NO in S68, and the process proceeds from step S51 to step S69.
[0077]
If the driver has returned the operation knob 22 from the extended position P3 to the parking position P2 at this stage, NO is determined in step S69, and the operation of the motor 2 is stopped in step S70. Thereby, the fastening force increased according to the time when the operation knob 22 is set to the increase position P3 is generated.
[0078]
After stopping the rotation of the motor 2 in the above step S70, in steps S71 and S72, the driver continues to monitor whether or not the operation knob 22 is set to the enlargement / retraction position P3 again. When it is set again at the increase / decrease position P3, the process proceeds to step S73, where the motor 2 rotates in the direction in which the brake is more strongly engaged (the direction in which the cable 8 is increased / reduced). An addition is made.
[0079]
As a result of the addition of the brake engagement force, when the arm 6 comes into contact with the parking limit detection switch 11 and the parking limit detection switch 11 changes to OFF, YES is determined in step S68 and the process proceeds to step S74. Is stopped.
[0080]
If the driver returns the operation knob 22 to the release position P1 while monitoring whether or not the driver sets the operation knob 22 to the enlargement position P3 again in steps S71 and S72, the release switch is turned ON. If it has changed, the process proceeds to step S76, where the motor 2 rotates in the direction to release the brake. Next, the increase / decrease flag is reset in step S77, and the operation flag is reset in step S78.
[0081]
As the motor 2 rotates, the release detection switch 15 is changed from the ON state to the OFF state by the cam surface 13a (step S79). When the release of the brake is completed, the process proceeds to step S80, and the operation of the motor 2 is stopped. The
[0082]
FIG. 17 shows a flowchart for explaining the control of the alarm system 50 of the parking brake system 1.
[0083]
In step S40, if the occurrence of an abnormality is detected by the signals a to g input to the CPU 52, the process proceeds to step S41, and the alarm means (light emitting diode) 50 is turned on. In the next step S42, the failure history is stored in a memory not shown.
[0084]
The occurrence of abnormality is based on the combination of the states of signals a to g when the parking brake system 1 operates normally, and when a different state is detected, the parking brake system 1 is abnormal (failed). It is determined that there is.
[0085]
For example, the combinations of the signals a to g in the system 1 incorporating the manual switch 20 having three positions of the release position, the parking position, and the pulling position illustrated in FIG. 5 are as listed in FIGS. is there. Further, the combinations of signals a to g in the system 1 described with reference to FIGS. 15 and 16 for increasing the brake fastening force according to the time during which the driver sets the operation knob 22 at the extended position are shown in FIG. As listed in.
[0086]
Here, FIGS. 18 and 20 are combinations when the ignition SW is in an OFF state, and FIG. 19 is combinations when the ignition SW is in an ON state. Here, the column “Release → Park Movement” means that the brake release state is being operated to the normal parking brake state, and the “Park → Increase Movement Movement” column is from the normal parking brake state to the increase brake state. Means during operation.
[0087]
For example, a combination in which the signal a is 12 V, b is 12 V, c is Open, d is Gnd, e is 12 V, f is 12 V, and g is 12 V is a combination that cannot be in a normal state. It is determined. It is also possible to detect an abnormal site by determining a combination of a specific pair of signals from the signals a to g. For example, if both the signals c and d are detected to be 12V, it can be determined that the motor 2 is abnormal. Note that the characters “Open” shown in FIGS. 18 and 19 indicate that an intermediate potential between 12 V and Gnd is detected because one of the switches is in an open state. Detecting an abnormal state of the parking brake device without preparing a separate sensor by determining “abnormal” when a combination state different from this occurs based on such a combination in a normal state Can do.
[0088]
In addition to this, the motor 2 starts to rotate in the brake release direction or the brake engagement direction. If normal, this rotation operation is completed in a fixed time, and the rotation operation of the motor 2 is stopped. Therefore, it is not normally considered that the rotating operation is continued beyond a certain time, so that it is determined as “abnormal”. It should be noted that “however, a certain time” added to FIGS. 18 to 20 means this. Further, since it is not normally considered that the time for which the driver operates the switch exceeds a certain time, this may be determined as “abnormal”.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a main part of a parking brake device according to an embodiment.
FIG. 2 is a perspective view of a main part of the parking brake device of FIG. 1 as viewed from the opposite side.
FIG. 3 is a front view showing an outline of a main part of the parking brake device of the embodiment.
4 is a side view corresponding to FIG. 3, with a partial cross section.
FIG. 5 is a schematic view of a manual switch constituting a part of the parking brake device of the embodiment.
FIG. 6 is a front view of an instrument panel for explaining an example of an arrangement position of a manual switch.
FIG. 7 is a diagram for explaining another example of a manual switch that constitutes a part of the parking brake device of the embodiment.
FIG. 8 is a diagram illustrating a configuration of a circuit that constitutes a part of the parking brake device according to the embodiment.
FIG. 9 is a diagram for explaining a circuit configuration related to the operation of the motor when the manual switch is set at the parking position.
FIG. 10 is a diagram for explaining a circuit configuration related to the operation of the motor when the manual switch is set to the extended position.
FIG. 11 is a diagram for explaining a circuit configuration related to the operation of the motor when the manual switch is set to the release position.
FIG. 12 is a diagram for explaining the operation of the switch related to the rotation stop of the motor of the parking brake device of the embodiment.
FIG. 13 is a flowchart for explaining an operation procedure when the driver is set at each position when the manual switch is a switch that can take a release position, a parking position, and an additional pulling position.
FIG. 14 shows a procedure of an operation associated with a driver operating a manual switch when a manual switch has a switch that can take a release position and a parking position, and in addition to this, a manual enlargement switch. It is a flowchart for demonstrating.
FIG. 15 is a flowchart for explaining a procedure of an operation for realizing an additional brake engagement force according to a time during which the driver is turning on the increase / decrease switch.
FIG. 16 is a flowchart related to FIG. 15 for explaining an operation procedure for realizing an additional brake engagement force according to a time during which the driver has turned on the increase / decrease switch.
FIG. 17 is a flowchart for explaining operations such as an abnormality detection of the parking brake device of the embodiment and an alarm associated therewith.
FIG. 18 illustrates an example of a typical typical combination state when the ignition SW is in an OFF state, which is a criterion for abnormality determination in a system including a switch having three positions of a release position, a parking position, and an increase position. FIG.
FIG. 19 illustrates an example of a typical typical combination state when the ignition SW is in an ON state, which is a criterion for abnormality determination in a system including a switch having three positions of a release position, a parking position, and an increase position. FIG.
FIG. 20 illustrates an example of a typical typical combination state when the ignition SW is in an OFF state, which is a criterion for abnormality determination in a system that realizes an additional brake engagement force according to the time set at the increase / decrease position. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric parking brake system 2 Motor 6 Arm 9 Pull spring 10 Normal parking detection switch 11 Parking limit detection switch 13 Cam part 15 of rotation disk Release detection switch 20 Manual switch 31 Normal parking circuit 32 Increase circuit 33 Brake release circuit 34 Relay switch 52 CPU related to manual switch
P1 Manual switch release position P2 Manual switch parking position P3 Manual switch extension position

Claims (1)

A vehicle parking brake device for fastening a parking brake by operating a motor,
A manual switch operable by a driver to select a normal parking mode in which the parking brake is fastened with a first fastening force and an increase mode in which the parking brake is fastened with a second fastening force larger than the first fastening force; ,
A normal parking circuit that can be switched by the manual switch and an increase circuit;
In the normal parking circuit, when a driver operates the manual switch to select the normal parking mode, power supply to the motor is started and the motor rotates in a direction in which the parking brake is engaged. A normal parking detection switch for stopping power supply to the motor when the parking brake is in a state of exerting the first fastening force;
In the increase circuit, when the driver operates the manual switch to select the increase mode, power supply to the motor is started and the motor rotates in the direction in which the parking brake is engaged. A parking limit detection switch is provided for stopping power supply to the motor when the parking brake is in a state of exerting the second fastening force.
The parking limit detection switch constitutes a part of the normal parking circuit, and the parking limit detection switch and the normal parking detection switch are connected in series in the normal parking circuit ,
The normal parking circuit has a power supply connection for connecting a power source and the motor,
The parking limit detection switch, the normal parking detection switch, and the manual switch are connected to the power supply connection in order from the power source side.
Vehicle parking, wherein the increase circuit has a second connection for connecting the manual limit switch between the parking limit detection switch and the normal parking detection switch of the normal parking circuit. Brake device.

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