JPS61108038A - Automatic parking brake system for car - Google Patents

Abstract

PURPOSE:To eliminate the release-disable state of brake action by allowing the releasing action between a pair of ratchet members to operate nearly at the same time in a parking brake system. CONSTITUTION:When a microcomputer 36 judges that the number N of revolution of an internal-combustion engine is larger than a prescribed value No, the computer 36 generates an excitation signal necessary for the excitation of the solenoid of a linear actuator 24, and the positive-revolution signal necessary for the positive revolution of a rotary electric motor 21. Then, the solenoid of the actuator 24 is excited, and attracts a plunger 24a, and positively revolves the rotary electric motor 21. Then, a ratchet lever 22e is separated from a ratchet wheel 22d by the operation of the plunger 24a, and the ratchet wheel 22d a little revolves positively in accordance with the positive revolution of the rotary electric motor 21, and the ratchet lever 22e can be separated in good timing from the ratchet wheel 22d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic parking brake system for a vehicle.

[Prior art]

Conventionally, this type of automatic parking brake system has been proposed, for example, as disclosed in Japanese Utility Model Application No. 59-42749, in which a ratchet engaged with a rotatably supported ratchet wheel is connected to an electromagnetic actuator. There is a parking brake device that releases the braking action on the vehicle by disengaging the ratchet wheel.

[Problem that the invention seeks to solve]

However, in such a configuration, if the above-mentioned ratchet wheel and ratchet are tightly engaged, it is impossible to dissociate the ratchet from the ratchet wheel by the electromagnetic actuator. This was one of the factors leading to the inability to release the braking action.

Therefore, in order to cope with this problem, the present invention provides an automatic parking brake system for a vehicle in which the dissociation between a pair of ratchet members constituting the ratchet mechanism is such that each ratchet member moves in a direction that causes each ratchet member to realize the dissociation. The aim is to have the two systems operate almost simultaneously.

[Problem that the invention seeks to solve]

In order to solve this problem, the configuration of the present invention, as illustrated in FIG. A ratchet mechanism 2 that allows the parking brake mechanism 1 to be released based on selective dissociation of a ratchet member, and a start operation detection device that detects when the vehicle start operation mechanism is operated and generates a start operation detection signal. means 3; output signal generating means 4 for generating first and second output signals in response to the starting operation detection signal; and a first driving force for generating a first driving force in response to the first output signal. and a 29th power generating means 6 that generates a 29th power in response to the second output signal, wherein each of the ratchet members is disengaged from each other in response to the first and second driving forces. Moreover, the parking brake mechanism 1 is configured to enter its release operation state in response to the disappearance of the first driving force.

[Function and effect of the invention]

By configuring the present invention in this manner, when the start operation mechanism is operated for the braking operation of the parking brake mechanism 1, the output signal generating means 4 generates a start operation detection signal from the start operation detection means 3. First and second output signals are generated in response to the first and second driving force generating means 5 and 6, respectively, and the first and second driving force generating means 5 and 6 generate the first and second driving force generating means in response to the first and second output signals, respectively. A force is generated, each of the ratchet members dissociates from each other in response to the first and second driving forces, and the parking brake mechanism 1 enters a release operating state in response to disappearance of the first driving force, Even if the engagement state between the two ratchet members is tight, each of the ratchet members can be driven by the first and second driving forces and disengaged from each other easily and in a timely manner,
As a result, the parking brake tatjtl can release the braking of the vehicle with good responsiveness in its release operating state.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.
The figure shows an example in which the present invention is applied to an automatic parking brake system for a vehicle equipped with an automatic transmission (not shown). It is composed of an electric mechanism 20 that drives the mechanism 10 and an electric control circuit 30 that controls the electric mechanism 20. The parking brake mechanism 10 has a parking lever 11, which is mounted on a floor surface near a console box in the passenger compartment of the vehicle so as to be movable in the vertical direction by a horizontal shaft 11a. supported.

A horizontal shaft 11a is attached to the base end of the parking lever 11 so that the pulley 12 integrally interlocks with the parking lever 11.
On the other hand, a cylindrical handle 13 is fixed to the tip of the parking lever 11. The handle 13 has a knob 13a.
is a release lever (not shown) which is rotatably attached to the parking lever 11 and is pushed against a coil spring (not shown) provided in the hollow part of the handle 13. is released from the engaging part (not shown) of the bracket fixed to the floor surface. Further, when the knob 13a is opened, the coil spring urges the knob 13a outward, causing the release lever to engage with the engaging portion of the bracket, thereby maintaining the parking lever 11 unrotatable.

The cables 1 and 4a are wound around the outer periphery of the pulley 12, and one end of the cable 14a is connected to a pole l-12b fitted inside the metal fitting 12a of the pulley 12 inside the metal fitting 12a. , while the other end of the cable 14a is loosely fitted into a long hole 15a (see FIG. 3) provided in the center of the equalizer 15. However, the cable 14a is
As the pulley 12 rotates clockwise in FIG. 2, the equalizer 15 moves to the left in FIG. 2, and as the pulley 12 rotates counterclockwise in the diagram, the equalizer 15 moves to the right. Allow movement to. The equalizer 15 is connected to the brake shoes of the rear wheels WE and Wr of the vehicle through the rear cables 16a and 16b at both ends, and pulls the rear cables 16a and 16b to the left by its leftward movement. , while due to its rightward movement both rear cables 16a
, 16b are allowed to move to the right. In addition, both rear wheels W (1, Wr
is braked by the respective brake shoes in response to the leftward pulling force of both rear cables 15a, 16b, and when the leftward pulling force of both rear cables 16a, 16b disappears, the braking is applied to the respective brake shoes. It is released by the brake shoe. Further, in FIG. 2, the reference numeral 12c indicates a position adjusting nut for the bolt 12b.

The electric mechanism 20 includes a rotary electric motor 21, a reduction gear 22, a pulley 23, and a linear actuator 24.

As shown in FIGS. 2, 4, and 5, the reducer 22 includes a worm wheel 22b rotatably supported by a support shaft 22a fixed in the casing by a bearing (not shown). A worm 22c driven by a rotary electric motor 21 meshes with the worm wheel 22b. In such a case, the worm wheel 22b and the worm 22c rotate the rotary electric motor 21 in the normal direction (
(or reverse rotation), it rotates forward (or reverse rotation).

The worm wheel 22b has a ratchet lever 22e.
Ratchet wheel 2 that together constitute a ratchet mechanism
2d is provided integrally and coaxially with the worm wheel 22b, and a one-way clutch 22f is connected coaxially with the ratchet wheel 22d to the ratchet wheel 22d.
Engaged when the ratchet wheel 22d rotates forward (or reversely)! 3 (or a disengaged state).

In such a case, the engaged state (or disengaged state) of the one-way clutch 22f is determined by the ratchet wheel 22d and the boot IJ.
This is achieved by engaging (or disengaging) each of the clutch members integrally formed in the respective parts 23. Ratchet lever 2
2e is swingably supported in the casing by a support shaft 22g so that its pawl portion selectively engages the teeth of a ratchet wheel 22d, and the ratchet lever 22e is fitted into a groove portion of the ratchet lever 22e. The L-shaped plunger 24a of the linear actuator 24 is engaged. This means that the linear actuator 24 maintains the plunger 24a at its original position with its solenoid de-energized, allowing engagement between the ratchet lever 22e and the ratchet wheel 22d, and attracts the plunger 24a by energizing the solenoid. This means that the ratchet lever 22e is released from the ratchet wheel 22d.

The pulley 23 is rotatably attached to the outer end of the support shaft 22a from which the casing extends, via a bush 23a press-fitted into its center hole! 1b supported and one-way clutch 2
It is connected to a ratchet wheel 22d via 2f. A link rod 22h is provided on the lower surface of the pulley 23, and the link rod 22h is connected to the knob 13a of the parking lever 13 via a cable 14C. As the knob 13a is pushed, the link rod 22h is pulled by the cable 14c and operates upward, causing the pulley 23 to move upward along the support shaft 22a and disengaging the one-way clutch 22f. On the other hand, in response to the opening of the knob 13a, the link rod 22h moves downward under the action of a spring (not shown), allowing the one-way clutch 22'' to engage as the pulley 23 moves downward.

A cable 1 is connected from the equalizer 15 to the outer periphery of the pulley 23.
A cable 14b extending in the same direction as cable 4a is wound and connected to a portion 23a of pulley 23 at its outer end. As a result, the pulley 23 rotates forward when the one-way clutch 22f is engaged, winding the cable 14b and pulling the equalizer 15 to the left in FIG.
The cable 14b is rewound by the reversal under the dissociation of 2f, allowing the equalizer 15 to move to the right. In addition,
The one-way clutch 22f partially protrudes from the earthen wall of the casing so as to be movable up and down. In addition, the cable 14b
is loosely fitted into a long hole 15b (see FIG. 3) formed in the center of the equalizer 15 at its inner end.

The electric control circuit 30 includes a shift switch 31, an accelerator switch 32, a release switch 33, and a vehicle speed sensor 34.
, the rotational speed sensor 35, the ignition switch SW and DC power supply B of the vehicle, and each switch 31,
32, 33 and each sensor 34, 35, the ignition switch sw has a movable ignition fixed contact IG (
Alternatively, the first (or second) closing signal is generated by turning on the starter fixed contact ST).

The shift switch 31 closes and generates a shift signal in response to a shift operation of the automatic transmission to a drive range or a reverse range, and generates a shift signal in response to a shift operation of the automatic transmission to a neutral range or a parking range. The shift signal is opened and the shift signal disappears. The accelerator switch 32 closes in response to depression of the accelerator pedal of the vehicle and generates a depression signal, and opens in response to release of the accelerator pedal to eliminate the depression signal. Release switch 3
3 closes and generates a release signal when the braking by the electric mechanism 20 is released, and opens when braking force is generated based on the operation of the electric mechanism 20 to eliminate the release signal. Note that each of the switches 31 to 33 is of a normally open type. Also, the second
In the figure, symbol M indicates the starter motor of the vehicle.

Vehicle speed sensor 34 detects the vehicle speed of the vehicle and generates a series of vehicle speed pulses having a frequency proportional to this. A rotational speed sensor 35 detects the rotational speed N of the internal combustion engine of the vehicle and generates a series of rotational speed pulses having a frequency proportional to this. The microcomputer 36 is always in operation by being supplied with power from the DC power supply B, and executes a computer program stored therein in advance according to the flowchart shown in FIG. As described in , various calculation processes necessary for controlling the rotary electric motor 21, the linear actuator 24, and the pilot lamp L are performed.

The pilot lamp indicates the execution state (or non-execution state) of the computer program by the microcomputer 36 by turning on (or turning off) the pilot lamp.

In this embodiment configured as described above, the ignition switch S is activated when the ratchet lever 228 is engaged with the ratchet wheel 22d when the vehicle is stopped.
When the movable contact W is connected to the ignition fixed contact IG and the starter fixed contact ST in sequence, the microcomputer 36 responds to the first closing signal from the ignition switch SW and executes the computer program according to the flowchart in FIG. Execution starts in step 40, and in step 41, rYEsJ is repeatedly determined based on the second closing signal from the ignition switch SW. Next, when the internal combustion engine is started under the drive of the starter motor M and the second closing signal from the ignition switch SW disappears, the determination in step 41 becomes "NO". Note that, at this time, it is assumed that the one-way clutch 22f is in an engaged state.

Therefore, the rotation speed N of the internal combustion engine determined by each rotation speed pulse from the rotation speed sensor 35 is equal to the predetermined rotation speed NO.
When it is larger, the microcomputer 36 determines rYEsJ in step 46, and generates a lighting signal necessary for lighting the pilot lamp L in step 42a.

Then, the pilot lamp L shows the microcomputer 3.
It lights up in response to the lighting signal from 6. Thereby, the driver can visually recognize that the microcomputer 36 has started executing the computer program. Note that the above-mentioned predetermined rotational speed NO is a value that is greater than or equal to the cranking rotational speed of the internal combustion engine and less than or equal to the idling rotational speed (for example, 400 rpm).
, p, m) in advance in the microcomputer 36.

Then, the microcomputer 36 performs step 42b.
At step 42C, an excitation signal necessary for excitation of the solenoid of linear actuator 24 is generated, and at step 42C, a forward rotation signal necessary for forward rotation of rotary motor 21 is generated for t seconds (for example, 1
seconds) occurs. Then, the solenoid of the linear actuator 24 is excited in response to the excitation signal from the microcomputer 36 and attracts the plunger 24a, and the rotary motor 21 rotates in the normal direction in response to the normal rotation signal from the microcomputer 36. In other words, the ratchet lever 22e, as shown by the broken line in FIG.
When the linear actuator 24 is pulled by the plunger 24a to separate from the ratchet wheel 22d, the ratchet wheel 22d rotates slightly in the normal direction together with the worm 22c and the worm wheel 22b in response to the normal rotation of the rotating electric motor 21, so that the ratchet lever 22e Even if the engagement state between the pawl and the teeth of the ratchet wheel 22d is in a hard state, the ratchet lever 22e can be easily and timely disengaged from the ratchet wheel 22d.

After that, during the circular operations in steps 43 and 44,
When the automatic transmission is shifted to the drive range or the reverse range and the accelerator pedal is depressed, the microcomputer 36 in step 43 causes the accelerator switch 32 to shift the accelerator pedal to the drive range or reverse range.
The switch 45 determines that it is rYEsJ based on the shift signal generated from the shift switch 31, and the switch 45a generates a reversal signal necessary to reverse the rotary motor 21.

Then, during the cyclic operation of both step 46, 458, the rotary electric motor 21 is reversed in response to the reverse rotation signal from the microcomputer 36, and the worm 22C1, the worm wheel 22b, and the ratchet wheel 22d are reversed.
The pulley 23 reverses when the one-way clutch 22f is engaged and the ratchet lever 22e is disengaged from the ratchet wheel 22d, and both cables 14a, 14b, equalizer 15 and both rear cables 16a, 16b are connected to the coils of the two brake shoes. It moves to the right under the repulsive action of the spring and releases the braking action on both rear wheels We and Wr. Then, when a release signal is generated from the release switch 33, the microcomputer 36 selects rYEsJ at step 46.
and each step 46a, 46 . At b, the reversal signal and the excitation signal are sequentially extinguished. For this reason, the rotating electric motor 2
1 stops when the reversal signal from the microcomputer 36 disappears, stopping the speed reducer 22 and the pulley 23, and the linear actuator 24 activates the plunger under the demagnetization of the solenoid in response to the disappearance of the excitation signal from the microcomputer 36. 24a engages the ratchet lever 22e with the ratchet wheel 22d as shown by the solid line in FIG. As a result, the vehicle can be started while the electric mechanism 20 is released and held for braking while the ratchet mechanism is engaged.

After such a start, during the cyclic calculation of both steps 47 and 48, as the vehicle shifts to a stop, the level of the vehicle speed pulse from the vehicle speed sensor 34 decreases for a predetermined time (for example, the vehicle speed is 1 km/h or less). When the level of the vehicle speed pulse does not change for more than 1 second), the microcomputer 36 selects rYESJ at step 48.
Then, in step 42b, an excitation signal is generated, and in step 42c, a normal rotation signal is generated for t seconds. Then, the linear actuator 24 tries to dissociate the ratchet lever 22e from the ratchet wheel 22d by means of the plunger 24a under the excitation of the solenoid that responds to the excitation signal from the microcomputer 36, and the rotary motor 21 attempts to dissociate the ratchet lever 22e from the ratchet wheel 22d. In response to the normal rotation signal, the worm 22c, worm wheel 22b, and ratchet wheel 22d are rotated in the normal direction, and the pulley 23 is also rotated in the normal direction under the engagement of the one-way clutch 22f. Pull the cables 16a and 16b to the left to both rear wheels Wl,
Put Wr into braking state. Then, after the normal rotation signal from the microcomputer 36 disappears, in step 43, rN
Ignition switch S at the stage of determining OJ
While eliminating the first closing signal from W, the microcomputer 36 determines "NO" in step 44,
Step 47a generates a forward rotation signal for t seconds, and step 47b cuts off power supply to each element of electric control circuit 30 and stops execution of the computer program. This means that unnecessary power consumption in the electrical control circuit 30 can be reduced. In addition, in response to the power supply interruption described above, the pilot lamp L is turned off, and the linear actuator 24 is activated by the plunger 24a to operate the ratchet lever 2 while the solenoid is demagnetized.
28 is engaged with the ratchet wheel 22d, and the rotating electric motor 21 is stopped. At this time, the said Racheno'rt
Since the reduction gear 22 disables reverse rotation from the pulley 23 side based on its reduction ratio under the engagement of the Jll mechanism, the braking force for the vehicle is maintained as it is.゛In order to manually release the braking action of the electric mechanism 20, please press the knob 1 of the parking lever 11.
3a, the link rod 22h connects to the cable 14.
c, the pulley 23 moves upward along the support shaft 22a, and the one-way clutch 22f is activated.
dissociate.

Then, if you tilt the parking lever 11 downward,
The pulley 23 reverses and releases the braking action of the electric mechanism 20 in the same manner as described above.

Further, in the above embodiment, an example in which the present invention is applied to the parking brake mechanism 10 having the parking lever 11 was explained, but the present invention is not limited to this, and for example, the present invention can be applied to a pedal-type or stick-type parking brake mechanism. It may also be carried out.

Further, in carrying out the present invention, in step 45, r
After determining YESJ, an excitation signal is generated and t1
2 seconds (for example, 0.1 to 0.2 seconds) to generate a normal rotation signal, excite the solenoid of the linear actuator 24, and rotate the rotary motor 21 in the normal direction for t1 seconds, substantially the same as described above. The operation and effect of step 45a may be achieved, and then the calculation in step 45a may be performed. Note that step 44
After the discrimination between rYEsJ and rYEsJ, the excitation signal is made to disappear.

Further, in the embodiment, the rotary electric motor 21 is used as the drive source, but instead of this, a positive or negative pneumatic pressure source, a hydraulic pressure source, or the like may be used as the drive source.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to the configuration of the claimed invention, FIG. 2 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 3 is a plan view of the equalizer of the parking brake mechanism shown in FIG. 2. , FIGS. 4 and 5 are perspective views of essential parts showing the inside of the electric mechanism shown in FIG. 2, and FIG. 6 is a flowchart showing the operation of the microcomputer shown in FIG. 2. Explanation of symbols 10...Parking brake mechanism, 20...Electric mechanism, 21...Rotating electric motor, 22...Reducer, 22d
... Ratchet wheel, 22e... Ratchet lever, 24... Linear actuator.

Claims (1)

[Claims] It has a parking brake mechanism that selectively enters a release operating state and releases the brakes of the vehicle, and a pair of ratchet members,
A ratchet mechanism that allows the parking brake mechanism to be released based on selective dissociation of both ratchet members, and a start operation that detects when the start operation mechanism of the vehicle is operated and generates a start operation detection signal. a detection means, an output signal generation means for generating first and second output signals in response to the start operation detection signal, and a first driving force generating means for generating a first driving force in response to the first output signal. means and
a twenty-ninth driving force that generates a second driving force in response to the second output signal;
a power generating means, wherein each of the ratchet members releases each other in response to the first and second driving forces,
and an automatic parking brake system for a vehicle, wherein the parking brake mechanism enters a release operation state in response to disappearance of the first driving force.