JP2004066874A - Parking brake device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parking brake device of a vehicle provided with a means for avoiding the occurrence of abnormality for securing predetermined tightening force. <P>SOLUTION: A parking limit detection switch 11, a usual parking detection switch 10, and a manual switch 20 are connected in series from this order from a battery B side in a circuit 31 for usual parking. When the manual switch 20 is set to a parking position P2, supply of electricity to a motor 2 is started to tighten parking brake by usual tightening force. When tightening force larger than usual tightening force is required, electricity is supplied to the motor 2 by a circuit 32 for increasing and reduction. The circuit 32 for increasing and reduction has a connection 37 connecting a section between the parking limit detection switch 11 and the usual parking detection switch 10 in the circuit 31 for usual parking with the manual switch 20. If abnormality occurs in the circuit 31 for usual parking, the parking brake limit detection switch 11 can be used as a switch for back-up. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD 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 shown in Japanese Utility Model Laid-Open No. 63-189874, Japanese Utility Model Laid-Open No. 64-26569, Japanese Patent Application Laid-Open No. 2001-106060, etc., a parking brake device that engages a parking brake using an electric motor has been proposed. It is starting to be put to practical use.
[0003]
In such an electric parking brake device, various safety measures, that is, detection of an abnormal state are incorporated. For example, Japanese Patent Application Laid-Open No. 2001-106060 proposes that various sensors be prepared to perform abnormality detection. .
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a parking brake device for a vehicle, which is provided with a means for avoiding occurrence of an abnormality, with respect to securing a predetermined fastening force.
[0005]
[Means for Solving the Problems]
According to the present invention, such a technical problem
A parking brake device for a vehicle that applies a parking brake by operating a motor,
A manual switch operable by a driver to select between a normal parking mode in which the parking brake is engaged with a first engagement force and an increase mode in which the parking brake is engaged with a second engagement force greater than the first engagement force; ,
It has a normal parking circuit and an additional circuit that can be switched by the manual switch,
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 exhibits the first engagement force,
When the driver operates the manual switch to select the increase mode, the driver starts power supply to the motor and rotates the motor in a direction in which the parking brake is engaged. A parking limit detection switch for stopping the power supply to the motor when the parking brake exerts the second engagement force;
The vehicle, wherein the parking limit detection switch forms a part of the normal parking circuit, wherein the parking limit detection switch and the normal parking detection switch are connected in series in the normal parking circuit. Is achieved by providing the parking brake device of the present invention.
[0006]
That is, according to the present invention, a parking limit detection switch for controlling an increase in a parking limit is incorporated in a normal parking circuit for using a parking brake with a normal engagement force, and the parking limit detection switch is replaced with a normal parking detection switch. Is connected in series, for example, when an abnormality occurs in the normal parking circuit and the motor cannot be stopped by the first fastening force despite being operated in the normal parking mode. However, if the second fastening force becomes larger than the first fastening force, the power supply to the motor can be stopped by the 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]
BEST MODE FOR CARRYING OUT THE INVENTION
In a preferred embodiment of the present invention, there is provided a structure in which an arm, which is a mechanical structure operating in association with a motor, is prepared, and a normal parking detection switch and a parking limit detection switch are turned off by engaging with the arm. Good to adopt. To determine the abnormality of the normal parking circuit, typically, control means such as a CPU is prepared, and voltage signals are input to the control means from a plurality of points of the normal parking circuit, and the voltage signals are obtained from the plurality of points. It is preferable to determine that an abnormality has occurred when the combination of the signals thus obtained is in a combination state that cannot be considered if it were originally possible. Further, it is preferable that a signal is supplied from the control means to the parking limit detection switch from the control means, and an operation source for forcibly turning off the parking limit detection switch is provided in the parking limit detection switch.
[0008]
Further, in the embodiment of the present invention, the manual switch further has a release mode for releasing the parking brake, and further has a release circuit switchable by the manual switch. When the driver operates the manual switch to select the release mode, power supply to the motor is started, the motor rotates in a direction to release the parking brake, and the motor is released when the parking brake is released. A release detection switch for stopping power supply to the power supply is provided.
[0009]
The power to be supplied to the motor to release the parking brake is preferably passed through an ignition switch. By passing through the ignition switch, there is no possibility that the parking brake is released when the engine is stopped.
[0010]
In the additional mode, when this is selected, a predetermined additional fastening force may be realized unconditionally, but the additional fastening force may be left to the driver's will. . That is, in the increase mode, the driver operates the manual switch to supply power to the motor for a time corresponding to a time during which the increase mode is selected, thereby selecting the increase mode. An additional brake engagement force according to time may be realized.
[0011]
The above and other objects and advantages of the present invention will be apparent from the following detailed description of preferred embodiments of the present invention.
[0012]
【Example】
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0013]
1 to 4 show a main part of a mechanical configuration of the electric parking brake system. As will be described in detail later, the electric parking brake system 1 includes 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, for example, when parking on a steep slope. 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 mounted on the output shaft 3a via a bearing 4. One end of an arm 6 is fixed to the output shaft 3a, and the arm 6 extends radially outward from the output shaft 3a along the outer surface of the rotating disk 5.
[0015]
A pin 7 is fixed to an outer peripheral portion of the rotating disk 5, and a parking brake (not shown) is connected to the pin 7 via a cable 8 having one end fixed to the pin 7. Referring to the drawing, the parking brake is in a brake engaged state when the cable 8 is pulled rightward, and is in a brake released state when the cable 8 is moved leftward. That is, when the rotating disk 5 rotates clockwise in FIG. 3, the brake is engaged, and when the rotating disk 5 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 spring 9 urges the arm 6 in a counterclockwise direction (a direction for releasing the brake). That is, the spring 9 has one end fixed to the distal end of the arm 6 and the other end fixed to the rotating disk 5. Side. If a compression spring is provided in place of the extension spring 9, the compression spring may be arranged closer to the brake fastening side than the arm 6.
[0017]
A first position detection switch 10 is disposed on the outer peripheral portion of the rotating disk 5 on the counterclockwise side with respect to the distal end portion of the arm 6, and a second position detection switch 11 is disposed on the clockwise side. The 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]
Normally, the parking detection switch 10 has an operator 10a, and the operator 10a is arranged so as to face the arm 6. Similarly, the operator 11 a of the parking limit detection switch 11 is arranged so as to face the arm 6. That is, the two actuators 10a and 11a are arranged at intervals from each other within the swing range of the arm 6 with the arm therebetween.
[0019]
The actuators 10a and 11a are both spring-biased in a direction protruding from the switch body. Normally, the parking detection switch 10 is turned on when the operator 10a is pushed into the switch body against the spring force. The parking limit detection switch 11 is turned off when the operator 10a is pushed into the switch body against the spring force.
[0020]
The rotating disk 5 has a generally circular outer contour, but a part thereof has a cam portion 13 which protrudes outward.
[0021]
A third position detection switch 15 is provided on the vehicle body (not shown) adjacent to the cam portion 13 of the rotating disk 5, and the tip of an actuator 15 a of the third position detection switch 15 is a cam face. 13a. Also in the third position detection switch 15, the actuator 15a is spring-biased in a direction protruding from the switch main body, and is turned off when the operator 15a is pushed into the switch main 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 a later description, and is referred to as a release detection switch in the following description.
[0022]
The following is a list of the relationship between the ON / OFF of the first to third position detection switches 10, 11, and 15 and the operation of each of the actuators 10a, 11a and 15a.
[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 operated by a driver, and operates the manual switch 20 to release a brake, a normal parking mode, and an increase mode. And can be switched alternatively. The type and position of the manual switch 20 are arbitrary and are not particularly limited. However, according to the illustrated example, the manual switch 20 is disposed at the center of the instrument panel 21 (see FIG. 6).
[0025]
The illustrated manual switch 20 may be, for example, a push-type switch, but here, is configured by a slide switch that can take three positions. The slide switch includes an operation knob 22. That is, with reference to FIG. 5, the manual switch 20 includes a release position P1 (a brake release SW: ON) which is a first position, and a parking position P2 (a parking SW: ON) which is a second position. And a third position P3 (increase SW: ON), which is a third position. These positions P1 to P3 are linearly arranged, and the user slides the operation knob 22 to perform a sliding operation. , The operation knob 22 can be set at each of the first to third positions.
[0026]
As a modified example, by providing a spring (not shown) for biasing the operation knob 22, when the driver slides the operation knob 22 from the parking position P2 to the increase position P3, the increase switch SW is turned on, and then, When the operator releases the operation knob 22, the operation knob 22 may return to the parking position P2 by a spring force (FIG. 7). Further, at this time, when the mode is set to the increase mode, it is preferable that the brake engagement force is increased only while the operation knob 22 is located at the increase position P3. The braking force can be adjusted arbitrarily.
[0027]
FIG. 8 shows a circuit 30 included in the electric parking brake system 1. The circuit 30 includes a first circuit, that is, a normal parking circuit 31, a second circuit, that is, an increase circuit 32, a third circuit, that is, a 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 to FIG. 9 as well, the normal parking circuit 31 has a connection 35 that connects the battery B and the first terminal of the electric motor 2. The switch 11, the normal parking detection switch 10, and the contact point P2 of the parking position (parking SW) of the manual switch 20 are connected in series. The first circuit 31 also has a connection 36 for connecting the other terminal of the electric motor 2 to the ground Gnd. The connection 36 includes a protection resistor R1 and a contact P2 of the relay switch 34 in order from the motor 2 side. Are connected in series.
[0029]
That is, the normal parking circuit 31 has the parking limit detection switch 11 and the normal parking detection switch 10 arranged in series, and operates in the normal parking mode, for example, when an abnormality occurs in the normal parking circuit 31. Nevertheless, even when the operation of the motor 2 cannot be stopped by the first fastening force, if the second fastening force becomes larger than the first fastening force, the parking limit detection switch 11 Power supply to the motor can be stopped.
[0030]
Referring also to FIG. 10, the additional circuit 32 is configured by sharing a part of the normal parking circuit 31. That is, the normal parking circuit 31 has a connection 37 for communication between the parking limit detection switch 11 of the connection 35 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 of 20 additional positions (increase SW). The contact P3 of the relay switch 34 is grounded by a connection 38.
[0031]
Referring to FIG. 11 as well, brake release circuit 33 includes a connection 38 that connects ignition (Ig) SW and contact P1 of relay switch 34, and release detection switch 15 is interposed in connection 38. . Further, the contact P1 at the release position (brake release SW) of the manual switch 20 included in the third circuit 33 is grounded by the connection 39.
[0032]
The resistor R2 and the capacitor C, which are in parallel with the motor 2 and are shown in FIG. 8, are protection 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 the CPU 52, and the CPU 52 receives the following signals 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 release detection detection switch 15 and contact P1 of relay switch 34;
(C) signal c: voltage Vc between motor 2 and relay switch 34;
(D) signal d: voltage Vd between manual switch 20 and 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 to the second light emitting diode as the display means 51.
[0036]
Next, the operation of the electric parking brake system 1 will be described in connection with the operation of the manual switch 20, (1) brake release (release), (2) normal parking brake engagement, (3) maximum parking brake engagement (increase). Will be described 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 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 the ON state.
(3) Since the arm 6 is not engaged, the parking limit detection switch 11 is in the state where the operator 11a is extended, and is therefore in the ON state.
(4) The third position detection switch 12 is in a state where 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 sets the parking position P2 by moving the operation knob 22 of the manual switch 20, the following operation is performed.
[0040]
Normally, when the 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]
Therefore, when the parking terminal P2 of the manual switch 20 is turned on, the first circuit 31 (FIG. 9) is energized and the power supply to the motor 2 is started, whereby the direction in which the motor 2 pulls the cable 8 ( (In the example shown, it rotates clockwise) and the operation of engaging the parking brake starts.
[0042]
Next, until the motor 2 rotates to a predetermined rotation angle, the rotating disk 5 rotates together with the arm 6 by the force of the spring 9. Accordingly, the cam portion 13 is separated from the release detection switch 15 by the rotation of the rotating disk 5 accompanying the start of rotation of the motor 2, and the release detection switch 15 changes to the ON state.
[0043]
When the rotation angle of the motor 2 exceeds a predetermined value, the tension acting on the cable 8 pulls the spring 9 through the rotating disk 5 and expands the spring 9, thereby providing the rotation disk 5 and the arm 6. The arm 6 starts to rotate clockwise relative to the rotating disk 5, thereby releasing the arm 6 from the normal parking detection switch 10 and starting to rotate toward the parking limit detection switch 11. .
[0044]
When the arm 6 separates from the normal parking detection switch 10, the normal parking detection switch 10 changes to the OFF state, and stops supplying power to the motor 2 (FIG. 12). Thus, in the parking brake system 1, the motor 2 stops rotating while the normal parking brake force is generated.
[0045]
When the driver slides the operation knob 21 in the state of the normal parking brake and releases the brake engagement force, that is, returns to the release position, the terminal P1 of the manual switch 20 changes to the ON state while the release detection switch 15 remains in the ON state. Therefore, the release circuit 33 (FIG. 11) is energized, and the motor 2 rotates in the direction to return the cable 8 (counterclockwise in the example shown) (brake release).
[0046]
Extra mode
When the driver sets the operation knob 22 of the manual switch 20 to the extension position P3, the terminal P3 (increase SW) of the manual switch 20 is turned on, and when the driver moves away from the extension 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 additional 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 illustrated example). ) To rotate.
[0048]
The rotation of the motor 2 continues further beyond the state of the normal parking, and the spring 9 further expands with this rotation operation, whereby the arm 6 rotates with the rotating disk 5. Independently rotate clockwise when released.
[0049]
When the ON state of the terminal P3 is continued and the arm 6 rotates until it comes into contact with 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. The power supply to the motor 2 stops (FIG. 12). Thus, the rotation of the motor 2 of the parking brake is stopped while the maximum parking brake force is generated.
[0050]
When the driver slides the operation knob 21 in the state of the maximum parking brake and releases the brake engagement force, that is, sets the release position, the release detection switch 15 is in the ON state and the terminal P1 of the manual switch 20 is in the ON state. , 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]
Further, for example, a situation in which the normal parking detection switch 10 is fixed and the operation of the motor 2 cannot be stopped by the normal parking brake force (first engagement force) even though the operation is performed in the normal parking mode. Is reached, the arm 6 rotates until the arm 6 comes into contact with the parking limit detection switch 11, and the parking limit detection switch 11 is turned off. At this time, in the normal parking circuit 31, since the parking limit detection switch 11 and the normal parking detection switch 10 are arranged in series, the power supply to the motor 2 cannot be stopped by the normal parking detection switch 10. 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 normal parking brake engagement and extension operations described above are performed normally, a light-up signal is output from the CPU 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 of the condition.
[0053]
Since the power for releasing the brake is supplied to the motor 2 via the ignition SW, the operation of releasing the parking brake is performed on condition that the ignition SW is in the ON state (the engine is started or the engine is running). As a result, it is possible to prevent the parking brake from being inadvertently released while the engine is stopped.
[0054]
The operation procedure of the parking brake system 1 by operating the manual switch 20 that can be switched to the three stages described above 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 to set the brake release position P1 (release SW: ON), YES is determined in step S1, and the process proceeds to step S2, where the direction in which the motor 2 releases the parking brake (the cable 8 is disconnected). (Return direction). Accordingly, the state in which the arm 6 contacts the normal parking detection switch 10 is maintained or changes to the state in which the arm 6 contacts the normal parking detection switch 10, 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 the OFF state. At the initial stage of release from the brake engagement state, the release detection switch 15 is in the ON state because the operator 15a of the release detection switch 15 is in the extended state. Therefore, NO is determined in the step S5, and the process returns to the step S1, the motor 2 continues to rotate, and the brake releasing operation is continued.
[0056]
When the release operation is completed, the cam face 13a of the rotating disk 5 pushes the operator 15a of the release detection switch 15 into the switch body, whereby the release detection switch 15 changes to OFF, thereby the step S5 The rotation of the motor 2 is stopped. Thereby, the release of the parking brake is completed.
[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 S7 via step S6, and the direction in which the motor 2 applies the parking brake (cable 8). In the direction of pulling). With the rotation of the motor 2, the rotating disk 5 rotates together with the arm 6, so that the release detection switch 15 changes to the ON state (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 the 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 is extended, the rotation of the rotating disk 5 and the arm 6 is released, and the arm 6 is separated from the normal parking detection switch 10. As a result, the normal parking detection switch 10 changes to the OFF state. Accordingly, it is determined YES (normal parking brake detection switch: OFF) in step S9, and the process proceeds to step S10, in which the rotation of the motor 2 is stopped. This completes the application of the parking brake (normal parking brake state).
[0059]
When the driver operates the manual switch 20 to set the additional position P3 (increase SW: ON), the process proceeds to step S11 via steps S1 and S6, and YES is determined in step S11, and the process proceeds to step S12. Then, the motor 2 rotates in the direction in which the parking brake is more strongly fastened (the direction in which the cable 8 is further pulled).
[0060]
With the rotation of the motor 2, the arm 6 separates from the normal parking detection switch 10 and rotates 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 the OFF state, and the parking limit detection switch 11 is in the ON state. The state of the parking limit detection switch 11 is determined in step S13. Since the parking limit detection switch 11 is initially in the ON state, the determination is NO, and the motor 2 is turned on in step S12 through steps S1, S6 and S11. Rotation continues.
[0061]
When the arm 6 comes into contact with the parking limit detection switch 11, the parking limit detection switch 11 changes to the OFF state. This state change is determined in step S13, the process proceeds to step S14, and the rotation of the motor 2 is stopped. You. As a result, the parking brake is increased (the maximum parking brake state).
[0062]
Next, when the driver slides the operation knob 22 to set 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 (the direction in which the cable 8 is returned). Rotates. As a result, the arm 6 is separated from the parking limit detection switch 11, so that the parking limit detection switch 11 is turned on (step S17), and finally, the release detection switch 15 is turned off, and the motor is turned off. Stops (step S18). By providing step S15 for monitoring ON / OFF of the release SW after step S14, after the maximum parking brake state, only the parking brake release operation can be performed. I have.
[0063]
Modification of parking brake operation (FIG. 14)
With respect to the parking brake system 1, 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 of a type in which the operation knob 22 returns 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. With reference to FIG. 14, an operation procedure for preparing and pushing the button switch to turn on the cable 8 until the maximum parking brake force is obtained will be described below.
[0064]
First, in step S20, for example, initialization such as resetting of a flag is performed, and then in step S21, it is determined whether or not the increase flag is in a set state. The technical meaning of this increase flag will be clear from the following description.
[0065]
The operation of the following steps S22 to S31 is the same as the above-described steps S1 to S10, and steps S22 to S31 correspond to steps S1 to S10, respectively, and thus description thereof will be omitted.
[0066]
When the driver pushes the button switch for increasing, the process proceeds from step S32 to step S33, where the ON operation of the button switch is performed (YES), and the direction in which the motor 2 applies the brake more strongly (the cable 8 is (Rotation direction). Next, in step S34, an increase flag is set.
[0067]
With the start of the rotation operation of the motor 2, the arm 6 separates from the first position (normal parking brake) detection switch 10 and rotates toward the second position (increased 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 the OFF state, and the parking limit detection switch 11 is in the ON state.
[0068]
The state of the parking limit detection switch 11 is determined in step S35. Since the parking limit detection switch 11 is initially in the ON state, the determination is NO, and the process returns to step S21. Now, since the increase flag is in the set state, it is determined as YES in step S21, and the rotation operation of the motor 2 (increase of the brake) is continued in 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 changes to the OFF state. This state change is determined in step S 35, the process proceeds to step S 36, and the motor 2 The rotation is stopped. As a result, the parking brake is increased (the 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 (the direction in which the cable 8 is returned). Rotates. Next, in step S39, the increase 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 turned on (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 Modifications of Parking Brake Operation (FIGS. 15 and 16)
With respect to the parking brake system 1, the driver slides the operation knob 22 from the second position to the third position as described above with reference to FIG. ) Will be described below with reference to FIG. 15 in the case where a mechanism of a type in which the brake engagement force is increased only while it is located in the position shown in FIG.
[0072]
In the operation procedure described below, after the driver sets the operation knob 22 to the parking position P2 and enters the engaged state with the normal braking force, the driver determines that a stronger braking force is required. , The operating knob 22 is slid to the increased position (third position). If the driver considers the operation procedure including the usage mode in which the driver slides the operation knob 22 from the beginning to the third position (increased position), the operation procedure can be changed to a corresponding operation procedure. It is.
[0073]
In FIG. 15, the operations of steps S50 to S56 are substantially the same as steps S20 to S26 (FIG. 14) described above, and steps S50 to S56 correspond to steps S20 to S26, respectively. Is omitted, but in the initialization step in step S50 and in step S57 following step S56, the operation flag is reset. The technical meaning of this operation flag will be 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. This operation procedure is substantially the same as the above-described steps S27 to S31 (FIG. 14). Yes, steps S58 to S62 correspond to steps S27 to S31, respectively. When the operation in the parking mode is completed and the vehicle is brought into the engaged state with the normal braking force, the operation flag is set in step S63.
[0075]
For example, if the driver slides the operation knob 22 and sets the operation knob 22 to the increased position P3 on the assumption that a strong braking force is required on a slope, the process proceeds from step S58 to step S64 to determine whether the operation flag is set. It is determined whether or not it is. Since the operation flag has already been set in step S63, YES is determined in step S64, and the flow advances to step S65 to determine whether the increase switch is in the ON state. Now, since the operation knob 22 has been set to the extension position P3, YES is determined, and the process proceeds to step S66 of the switch, in which the motor 2 applies the brake more strongly (the cable 8 is increased). Direction), and the increase flag is set in the next step S67 at the same time as the start of this rotation operation.
[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 separates 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. NO is determined in S68, and the process proceeds from step S51 to step S69.
[0077]
At this stage, if the driver has returned the operation knob 22 from the increased position P3 to the parking position P2, the determination in step S69 is NO, and the operation of the motor 2 is stopped in step S70. As a result, an increased fastening force is generated according to the time during which the operation knob 22 is set at the increased position P3.
[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 additional position P3 again. When the motor 2 is set to the retraction position P3 again, the process proceeds to step S73, in which the motor 2 rotates in a direction for further strengthening the brake (direction for increasing the cable 8). Additions are made.
[0079]
When the arm 6 comes into contact with the parking limit detection switch 11 as a result of the addition of the braking force, and the parking limit detection switch 11 is turned off, it is determined to be YES in step S68, and the process proceeds to step S74. Is stopped.
[0080]
When 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 retraction position P3 again in steps S71 and S72, the release switch is turned on. If it has changed, the process proceeds to step S76, and the motor 2 rotates in a direction to release the brake. Next, the increase flag is reset in step S77, and the operation flag is reset in step S78.
[0081]
With the rotation of the motor 2, 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, where the operation of the motor 2 is stopped. You.
[0082]
FIG. 17 is a flowchart illustrating the control of the warning system 50 of the parking brake system 1.
[0083]
In step S40, when the occurrence of abnormality is detected based on the signals a to g input to the CPU 52, the process proceeds to step S41, and the alarm unit (light emitting diode) 50 is turned on. In the next step S42, a history of the failure is stored in a memory (not shown).
[0084]
The occurrence of the abnormality is determined based on a combination of the states of the signals a to g when the parking brake system 1 operates normally, and when a state different from this is detected, the parking brake system 1 is abnormal (failure). 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 the three positions of the release position, the parking position, and the retraction position illustrated in FIG. 5 are as listed in FIGS. is there. The combination of the signals a to g in the system 1 that increases the brake engagement force in accordance with the time during which the driver sets the operation knob 22 to the increased position described with reference to FIGS. As enumerated above.
[0086]
Here, FIGS. 18 and 20 show combinations when the ignition switch is in the OFF state, and FIG. 19 shows combinations when the ignition SW is in the ON state. Here, the column of “release → park movement” means that the operation is being performed from the brake released state to the normal parking brake state, and the column of “park → increased movement” is from the normal parking brake state to the increased 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, and is thus “abnormal”. Is determined. It is also possible to detect an abnormal part by judging 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 12 V, it can be determined that the motor 2 is abnormal. Note that the character “Open” in FIGS. 18 and 19 indicates that an intermediate potential between 12 V and Gnd has been detected because one of the switches is open. Based on such a combination in the normal state, it is possible to detect an abnormal state of the parking brake device without preparing a separate sensor by determining that the state is abnormal when a different combination state occurs. Can be.
[0088]
In addition, the motor 2 starts rotating in the brake releasing direction or the brake engaging direction. Normally, this rotating operation is completed in a fixed time and the rotating operation of the motor 2 is stopped. Therefore, it is not normally considered that the rotation operation is continued for a certain period of time, and therefore, it is determined to be “abnormal”. It should be noted that “however, a fixed time” added to FIGS. 18 to 20 means this. Further, since it is not usually considered that the driver operates the switch for more than a certain period of time, this may be determined to be “abnormal”.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing 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 schematically showing a main part of the parking brake device of the embodiment.
FIG. 4 is a side view corresponding to FIG. 3 with a partial cross section.
FIG. 5 is a schematic view of a manual switch that forms 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 view for explaining another example of the manual switch that forms a part of the parking brake device of the embodiment.
FIG. 8 is a diagram showing a configuration of a circuit constituting a part of the parking brake device of the embodiment.
FIG. 9 is a diagram for explaining the configuration of a circuit related to the operation of a motor when a manual switch is set to a parking position.
FIG. 10 is a diagram for explaining a configuration of a circuit related to the operation of the motor when the manual switch is set to the extension position.
FIG. 11 is a diagram illustrating a configuration of a circuit related to the operation of the motor when the manual switch is set to a release position.
FIG. 12 is a diagram for explaining an operation of a switch associated with stopping rotation of a motor of the parking brake device according to the embodiment.
FIG. 13 is a flowchart for explaining an operation procedure when the driver sets the manual switch to each position in a case where the driver can set the release position, the parking position, and the extension position.
FIG. 14 is a diagram illustrating a procedure of an operation involved in operating a manual switch when a driver operates a manual switch when a manual switch is provided with a switch capable of setting a release position and a parking position and a manual increase / decrease switch. It is a flowchart for explaining.
FIG. 15 is a flowchart for explaining a procedure of an operation for realizing an additional brake engagement force in accordance with a time during which the driver turns on the increase / decrease switch.
FIG. 16 is a flowchart related to FIG. 15 for explaining a procedure of an operation for realizing an additional brake engagement force in accordance with a time during which the driver turns on the increase switch.
FIG. 17 is a flowchart for explaining an operation of detecting an abnormality of the parking brake device of the embodiment and an alarm associated therewith.
FIG. 18 illustrates an example of a normal typical combination state in which an ignition switch is in an OFF state, which is a reference for abnormality determination in a system including a switch having three positions of a release position, a parking position, and an extension position. FIG.
FIG. 19 illustrates an example of a normal representative combination state when an ignition switch is ON, which is a reference for abnormality determination in a system including a switch having three positions of a release position, a parking position, and an extension position. FIG.
FIG. 20 illustrates an example of a normal representative combination state when the ignition switch is OFF, which is a reference for abnormality determination in a system that realizes additional brake engagement force according to the time set in the extension position. FIG.
[Explanation of symbols]
1. Electric parking brake system
2 motor
6 arm
9mm tension spring
10 Normal parking detection switch
11 Parking limit detection switch
Cam part of 13 ° rotating disk
15 release detection switch
20mm manual switch
31 normal parking circuit
32mm increase circuit
33 ° brake release circuit
34 Relay switch related to manual switch
52 CPU
P1 @ Manual switch release position
P2 @ Manual switch parking position
P3 Manual switch extra position

Claims (4)

A parking brake device for a vehicle that applies a parking brake by operating a motor,
A manual switch operable by a driver to select between a normal parking mode in which the parking brake is engaged with a first engagement force and an increase mode in which the parking brake is engaged with a second engagement force greater than the first engagement force; ,
It has a normal parking circuit and an additional circuit that can be switched by the manual switch,
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 exhibits the first engagement force,
When the driver operates the manual switch to select the increase mode, the driver starts power supply to the motor and rotates the motor in a direction in which the parking brake is engaged. A parking limit detection switch for stopping the power supply to the motor when the parking brake exerts the second engagement force;
The vehicle, wherein the parking limit detection switch forms a part of the normal parking circuit, wherein the parking limit detection switch and the normal parking detection switch are connected in series in the normal parking circuit. Parking brake device. The normal parking circuit has a power supply connection for connecting a power supply and the motor,
In the power supply connection, the parking limit detection switch, the normal parking detection switch, and the manual switch are connected in order from the power supply side,
The said additional circuit has the 2nd connection which connects between the said parking limit detection switch of the said normal parking circuit, and the said normal parking detection switch, and the said manual switch, The Claim 1 characterized by the above-mentioned. A parking brake device for a vehicle according to claim 1. The manual switch further has a release mode for releasing the parking brake,
Further, a release circuit switchable by the manual switch is further provided,
In the release circuit, when a driver operates the manual switch to select the release mode, power supply to the motor is started, and the motor rotates in a direction to release the parking brake, 3. The parking brake device according to claim 1, further comprising a release detection switch for stopping power supply to the motor when the parking brake is released. In the increase mode, the driver operates the manual switch to supply power to the motor for a time corresponding to the time during which the increase mode is selected, thereby selecting the increase mode. The parking brake device for a vehicle according to any one of claims 1 to 3, wherein an additional brake engagement force according to the following is realized.

Images